• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    METAL CUTTING INSERT AND A MILLING TOOL. The invention relates to an interchangeable cutting insert (1) for a milling tool, comprising an upper side (2) defining an upper extension plane and a lower side (3) defining a lower extension plane, parallel to the upper extension. A central axis (C2) extends perpendicularly through the upper and lower extension planes. A side surface (4) connects the upper side and the lower side, the side surface comprising a plurality of main upper clearance surfaces (5) and secondary clearance surfaces (6a, 6b). At least six identical and alternatively usable upper cutting edges (7) extend around the upper side. Each cutting edge comprises a main cutting edge cutting portion, and at least a secondary cutting edge portion. The main upper clearance surfaces are formed with an obtuse internal angle (?), In relation to the upper extension plane, as seen in a lateral frontal projection view.
    公开号:BR102015000380B1
    申请号:R102015000380-3
    申请日:2015-01-08
    公开日:2020-11-24
    发明作者:Roman Stefan；Viklund Per
    申请人:Sandvik Intellectual Property Ab；
    IPC主号:
    专利说明:

    Technical Field of the Invention
    [001] The present invention is related to a cutting insert, configured for machining by removing chips from a metal workpiece, by means of a milling procedure, as described in the preamble of claim 1. The present invention also applies refers to a milling tool as described in the preamble to claim 18, comprising a tool body and at least one cutting insert. Background of the Invention and State of the Art
    [002] Milling tools for machining metal workpieces by chip removal are generally composed of a rotating tool body and a plurality of replaceable cutting inserts made of carbide, ceramic material or other type of hard material. Since the cutting inserts are subjected to significant wear after use in a milling tool, it is desirable that the insert has as many edges as possible in order to extend the life of said cutting insert. Therefore, cutting inserts are usually made of double sides, with cutting edges formed along an upper side and a lower side of the insert, thereby doubling the number of cutting edges per insert.
    [003] A top milling tool, configured for chip removal machining, and a double delimited cutting insert with seven main cutting edges per side are disclosed in patent document EP 2.022.584. The milling tool comprises a tool body, including a front end and a rear end, between which a central axis of rotation extends around, the tool being rotatable in a direction of rotation and with which a wrap surface is concentric. Several tablet seats are formed in a transition between the front end and the wrapping surface. Each tablet seat comprises a base support surface and a side support comprising at least one side support surface. A chip pouch is provided in front of each insert seat, in the direction of rotation of the tool. The tool also includes several cutting inserts, mounted firmly and detachable on the insert seats.
    [004] The cutting insert disclosed in patent document EP 2.022.584 comprises an upper side, defining an upper extension plane, and a lower side, defining a lower extension plane parallel to the upper extension plane, in which an axis center extends perpendicularly through the upper extension plane and the lower extension plane. A lateral surface connects the upper side and the lower side, the lateral surface comprising a plurality of primary and secondary gap surfaces. Seven identical and alternately usable upper cutting edges extend around the upper side, each cutting edge comprising a main chip-removing cutting edge portion and a secondary cutting edge portion, wherein the cutting edge portion of main cut is formed in a transition between the upper side and one of said main gap surfaces, and the secondary cut edge portion is formed in a transition between the upper side and one of said secondary gap surfaces, in a region between two portions of main cutting edges. The milling insert has a conventional negative geometry, with the clearance surfaces formed at right angles to the top and bottom extension planes of the insert. The cutting insert is mounted on the tool body of said milling tool, so that the main cutting edge is arranged at a corner angle of 40 ° -44 ° with respect to the axis of rotation of the milling tool. In other words, the entry angle (K) between the main cutting edge and the feed direction of the milling tool is 46-50 °. The cutting insert also has curved cutting edges, which serve to ensure an effective positive inclination angle of the main cutting edge, also for axial negative and moderately negative radial vertex angles (exit angles). This aspect improves the properties of chip formation for moderate cutting depths. However, the effective angle of inclination, even with curved cutting edges, is only moderately positive. The drawbacks associated with small effective inclination angles, such as the cutting characteristics with respect not only to the formation and control of the chip, but also to the toughness behavior of the cutting edges and to the noise level of the tool, are present in the cutting insert and milling tool disclosed in patent document EP 2,022,584. Summary of the Invention
    [005] It is an objective of the present invention to overcome the problems discussed above and to provide a cutting insert and a top milling tool, with which it is possible to obtain an improved toughness behavior of the cutting edges, an improved formation and control of chip and smoother machining, resulting in lower noise levels.
    [006] This objective, according to a first aspect of the invention, is obtained by means of the cutting insert initially defined, which is characterized by the fact that each of the said upper main clearance surfaces is formed with an obtuse internal angle with respect to the superior extension plane, when seen in a lateral frontal projection view. In other words, the main upper clearance surface is angled outward. With this configuration, the apex angle of the main cutting edge can be adjusted to be markedly positive on a top milling tool, configured so that the axial apex angle or axial exit angle is neutral or negative, the angle of radial vertex or radial exit angle is markedly negative, and the entry angle is acute. In other words, the cutting insert is configured to be mounted on the top milling tool with an extremely negative radial apex angle (that is, at least -25 °, and in extreme cases of -60 °), which in combination with a moderately negative axial apex angle (that is, from 0 ° to -20 °) a very positive inclination angle is obtained in the main cutting edge portion of the top milling tool. The acute entry angle (typical of the top milling tool) is a prerequisite for obtaining a positive slope in the main cutting edge portion. Thus, a negative radial apex angle does not contribute to any positive inclination in the main cutting edge portion with a 90 ° entry angle in the main cutting edge portion (ie, in a recess milling tool). The positive slope of the main cutting edge portion on the top milling tool will increase with a more negative radial apex angle and / or with a reduced entry angle. With a markedly positive inclination angle of the main cutting edge, the top milling tool operates more smoothly, as the main cutting edge portion gradually enters the workpiece, providing lower noise levels and a improved toughness behavior of the cutting edges. In addition, chip formation is excellent, with the formation of spiral shaped chips that are easily removed. Thanks to the possibility of having a wide angle of inclination, the cutting insert according to the invention has similar cutting characteristics to that of a double-sided cutting insert with positive geometry, thus, with a large inclination angle. In addition, the insert is suitable for end milling stainless steel, such as duplex stainless steel. However, the negative geometry of the cutting insert according to the invention allows more cutting edges per cutting insert and, therefore, also a greater saving of the tool, when compared to a cutting insert with positive and double-sided geometry. The cutting insert according to the invention is configured for an extremely negative radial apex angle, by tilting the main gap surfaces outwards (for example, with an obtuse internal angle (a) within the range of 93 ° <α <118 °, preferably within the range of 98 ° <ot <118 ° or 100 ° <ot <118 °). This feature increases the strength of the main cutting edge portion with a negative radial apex angle. In addition, the main slack surfaces inclined outwards make it possible to form the top side with a chip surface having a relatively large chip surface angle (cpi (for example, within the range of 35 ° <(pi <55 °, plus preferably 40 ° <(pi <55 °), with respect to the upper extension plane, along the main cutting edge portion, so the chip surface can provide a positive slope exit angle, despite the vertex angle extremely negative radial radius, while the outward-sloping main gap surface maintains a suitable cutting edge angle (i.e., the angle between the main gap surface and the chip surface), and the strength of the the main cutting edge is thereby maintained.
    [007] According to one modality, the internal angle (a) between the upper extension plane and each one of the said upper main clearance surfaces is available within the range of 93 ° <α <118 °. An angle less than 93 ° can result in too large a gap or gap, that is, on the one hand, the main gap surface is located rotatably behind the chip-removing main cutting edge portion and, on the other hand, the cone-shaped surface generally generated by it. An angle less than 93 ° will also reduce the strength of the cutting insert. An angle greater than 118 ° may instead provide insufficient clearance. The lower limit can preferably be increased to at least 98 °, or at least 100 °, in order to provide an increase in strength and the possibility of providing a greater chip surface angle at the radial apex angle negative. Consequently, according to a preferred embodiment, the internal angle (a) is within the range of 98 ° <α <118 ° or 100 ° <α <118 °, preferably within the range of 98 ° <α <114 ° or 100 ° <to <114 °, in which resistance and clearance range can be optimized (for example, at a negative radial apex angle within a sub-range of -30 ° to -50 °).
    [008] According to one embodiment, the upper side comprises a lowered top surface, which extends parallel to the upper extension plane, and an upper chip surface, which extends between the upper cutting edges and the surface upper base. The upper recessed base surface is an opportune way to obtain the positive chip surface angle and exit angle, which results in improved chip formation, lower cutting forces and thus also reduced energy consumption. Preferably, the chip surface angle (cpi) is within the range of 35 ° cpi ^ 55 °, more preferably, within the range of 40 ° <(px <55 °, relative to the upper extension plane, along of the main cutting edge portion.
    [009] According to one embodiment, the upper side further comprises at least one upper reinforcement region connecting the upper cutting edges with the upper chip surface. Said at least one reinforcement region increases at least partially the interior of the main cutting edge portion, the angle of the main cutting edge, which is the internal angle between the main upper clearance surface and the chip surface, thereby , increasing the cutting edge resistance. The reinforcement region also acts to direct the chip away from the chip surface, reducing friction and thus also generating heat. This mode is particularly advantageous for working at high loads. The width and angle of the reinforcement region can be varied, but generally, a wider reinforcement region makes it possible to work at higher loads. Also, it is possible to have more than one reinforcement region, for example, two reinforcement regions that are arranged in connection with each other, and with a slightly different angle with respect to the upper extension plane.
    [010] According to a modality, each of the said secondary clearance surfaces is formed with an internal angle (β) with respect to the upper extension plane, as seen in a lateral frontal projection view, where (β <α). By forming the upper secondary clearance surface, which is located pivotally behind the secondary edge portion, with a smaller angle in relation to the upper extension plane than that of the upper primary clearance surface, it becomes possible for axial apex angles negative to obtain a clearance that is essentially the same as that which rotates behind the main cutting edge portion and behind the secondary cutting edge portion.
    [011] According to one modality, the internal angle (β) between the upper extension plane and the secondary clearance surface located below at least part of the upper secondary cutting edge is within the range of 85 ° <β <100 °. Within this range, the clearance behind the secondary edge portion is optimized for slightly negative axial apex angles, or neutral angles (0o).
    [012] According to one embodiment, the cutting insert comprises at least seven identical and alternatively usable upper cutting edges. The large number of cutting edges prolongs the life of the cutting insert compared to a cutting insert with a smaller number of edges.
    [013] According to an embodiment, the cutting insert is double-sided, with the bottom side identical to the top side. This doubles the number of usable cutting edges and thus doubles the service life compared to a single-sided cutting insert.
    [014] According to one embodiment, the side surface comprises a plurality of recessed support surfaces. By providing the recessed support surfaces, their extension can be increased, so that the total area of the support surface is increased. The recessed support surfaces, which can be rounded or flat, thus serve to improve the position of the cutting insert in a insert seat of a tool body, when the cutting insert is part of a milling tool, and to prevent rotation of the cutting insert within the insert seat.
    [015] According to one embodiment, the main cutting edge portion is straight or essentially straight. This type of cutting insert generally provides better chip formation along the entire length of the main cutting edge portion, compared to a cutting insert with a curved main cutting edge portion. In this way, the same cutting insert can easily be used for chip formation for different cutting depths.
    [016] According to one embodiment, an end portion of the main cutting edge portion forms a recess, when viewed in a side frontal projection view of the insert, so that the end portion of the main cutting edge portion is disposed positioned below a successive secondary cutting edge portion, with respect to the upper extension plane. The end of the main cutting edge portion is designated here for maximum cutting depth, when the main cutting edge portion is active, and the successive secondary cutting edge portion is designated for an associated secondary cutting edge portion with (or, idealized to be used together) the following main cutting edge portion of the cutting insert (in the following successive indexed position). In addition, the end portion of the main cutting edge portion designates a relatively small portion of the main cutting edge portion (maximum 20% of the entire length of the main cutting edge portion). The modality can thus obtain a reliable gap between the workpiece and an inactive main cutting edge portion, positioned radially within an active secondary cutting edge portion. In other words, the recess formed in the terminal vapor of the inactive main cutting edge portion provides clearance for the radially machined flat surface within the active secondary cutting edge portion, during the milling procedure.
    [017] According to one embodiment, an end portion of the main gap surface at an end portion of the main cutting edge portion, has an internal angle less than the obtuse internal angle of the remaining main gap surface. As in the previous embodiment, the end of the main cutting edge portion is here designated for maximum cutting depth, when the main cutting edge portion is active, where the end portion of the main cutting edge is a relatively small portion of the main cutting edge portion (i.e., ^ 20% of the entire length of the main cutting edge portion). This modality is another or another way of obtaining a reliable radial clearance within the active secondary cutting edge portion. Thus, the clearance is obtained by reducing the internal angle of the main clearance surface, located at the end portion of the inactive main cutting edge portion. This can be achieved, for example, by polishing the gap surface (after compression and sintering of the cutting insert), in order to obtain a reduced / smaller internal angle in the end portion. The internal angle between the upper extension plane and the terminal portion of the range is 85 ° to 100 °, preferably around 90 ° (± 2 °).
    [018] According to one embodiment, the main cutting edge portion is tilted, when viewed from the side frontal projection view of the cutting insert, so that the main cutting edge portion is disposed in relation to the plane of upper extension, in a direction of one end of the main cutting edge portion, where an end portion of the main cutting edge portion is positioned below a successive secondary cutting edge portion, in relation to the upper extension plane. As previously mentioned, the end of the main cutting edge portion is shown here to designate the maximum cutting depth when the main cutting edge portion is active, and the successive secondary cutting edge portion is presented here to designate a portion secondary cutting edge associated with (designed to be used together) the following main cutting edge portion of the cutting insert (in the following indexed position). This mode also obtains a reliable clearance between the workpiece and an inactive main cutting edge portion, positioned radially inside an adjacent and active secondary cutting edge portion, during the milling procedure. In addition, there may be a risk that at least the end portion of the inactive main cutting edge portion and, specifically, its active secondary surface, will collide with the workpiece during milling. The clearance is thus obtained by tilting the main cutting edge portion (inactive), so that the end portion is positioned below the successive secondary cutting edge portion (active), with respect to the upper extension plane. The main cutting edge portion can be formed as a straight edge, having a constant slope along the entire length of the cutting edge, or it can be partially inclined or curved, when viewed in a lateral front projection view of the cutting insert. cut, so that the end portion is positioned below the successive secondary cutting edge portion. However, the end portion may also include an upward transition edge, connected to the successive secondary cutting edge portion. The transition edge is relatively short and generally used to connect different cutting edge portions, in a smooth way, so as not only to avoid sharp / sharp corners and to increase the resistance of the cutting edge line in the transition between edge portions as well as facilitating the manufacture of the cutting insert.
    [019] According to one embodiment, the secondary cutting edge portion is in the form of a curved edge portion, extending between two adjacent main cutting edge portions and having at least one radius of curvature. This type of cutting insert is useful, for example, for large depths of cut, since the main cutting edge is relatively long compared to a secondary cutting edge insert with an eccentric type surface. Also, the said insert it can have sharp corner regions and can functionally provide reduced cutting forces compared to eccentric-type secondary cutting edge inserts. A larger radius of curvature of the curved edge portion provides a stronger corner region. In the case where the cutting insert has portions of curved edges, the transitions between the secondary gap surfaces and the primary gap surfaces are usually gradual, so that no sharp edges marking the transition occur. In that case, it should be understood that the secondary gap surface is the surface portion that rotates behind the secondary cutting edge portion, and the main gap surface is the surface portion that rotates behind the primary cutting edge portion.
    [020] According to one embodiment, the secondary cutting edge portion is in the form of at least one faceted edge portion, formed between two adjacent main cutting edge portions. Such a faceted edge portion can, for example, serve as a corner generating edge portion.
    [021] According to one embodiment, said at least a portion of the secondary cutting edge is in the form of a secondary edge of an eccentric type surface. A cutting insert according to this modality can be used to generate flat surfaces and is preferably used for finishing operations. The angle that the secondary eccentric-type surface edge makes with the main cutting edge portion can be adapted to different entry angles of the milling tool.
    [022] According to one embodiment, each top cutting edge comprises a first and a second secondary edge of an eccentric type surface, formed at an angle relatively to each other, as seen in a plan view. In this modality, it is possible to use the same cutting insert in surface finishing operations, with milling tools having different entry angles. Also, it is possible to form the secondary edges so that when the first secondary edge is used as an eccentric type surface secondary edge, the second secondary edge functions as a corner-generating edge. This can be advantageous, for example, when working with cast iron, in order to reduce the risk of partially melting the edge.
    [023] According to a second aspect of the invention, the aforementioned objective is achieved by means of the initially defined end milling tool, which is characterized by the fact that it comprises at least one cutting insert according to the invention, assembled in a firmly and detachable in said at least one tablet seat.
    [024] According to an embodiment of this second aspect of the invention, the tool is configured so that a portion of the main cutting edge has an entry angle (K) less than 80 °, and so that the plane of extension upper part of the cutting insert is, on the one hand, radially pointed with a radial apex angle (Yf) within the range of -60 ° <Yf - -25 ° and, on the other hand, axially pointed with an axial apex angle ( Ym) within the range of -20 ° Ym 0 °. With this tool, it is possible to obtain a markedly positive inclination angle of the main cutting edge portion, thus obtaining the advantages mentioned above, Brief Description of Drawings
    [025] Figure 1 shows a perspective view of a cutting insert, according to a first embodiment of the invention.
    [026] Figure 2 shows a side view of the cutting insert shown in figure 1.
    [027] Figure 3 shows a partial top view of the cutting insert shown in figure 1.
    [028] Figures 4a-4c show cross sections, respectively, along lines IVa, IVb and IVc, shown in figure 3.
    [029] Figure 5 shows a perspective view of a cutting insert, according to a second embodiment of the invention.
    [030] Figure 6 shows a side view of the cutting insert shown in figure 5.
    [031] Figure 7 shows a perspective view of a cutting insert, according to a third embodiment of the invention.
    [032] Figure 8 shows a partial top view of the cutting insert shown in figure 7.
    [033] Figures 9a-9c show partial side views and a cross section of lines IXa-IXa, IXb-IXb and along line IXc-IXc, shown in figure 8, respectively.
    [034] Figure 10 shows a perspective view of a cutting insert, according to a fourth embodiment of the invention.
    [035] Figure 11 shows a perspective view of a cutting insert, according to a fifth embodiment of the invention.
    [036] Figure 12 shows a top view of the cutting insert shown in figure 11.
    [037] Figure 13 shows a cross section along the line shown in figure 12.
    [038] Figure 14 shows a perspective view of a cutting insert, according to a sixth embodiment of the invention.
    [039] Figure 15 shows a perspective view of a milling tool, according to the invention.
    [040] Figure 16 shows a side view of the milling tool illustrated in figure 15.
    [041] Figure 17 shows the axial apex angle in a partial side view of the milling tool illustrated in figure 15.
    [042] Figure 18 shows the radial apex angle in a partial plan view of the milling tool illustrated in figure 15.
    [043] Figure 19 shows the entry angle in a partial side view of the milling tool illustrated in figure 15.
    [044] Figure 20 shows the angle of inclination in a partial perspective view of the milling tool illustrated in figure 15.
    [045] Figures 21a-21b show a perspective view and a side view of a seventh modification of the cutting insert.
    [046] Figures 22a-22b show a perspective view and a side view of an eighth modality of the cutting insert.
    [047] Figures 23a-23b show a perspective view and a side view of a ninth cutting insert embodiment.
    [048] Figures 24a-24b show a tenth and eleventh modality, respectively, of a transition edge in the ninth modality. Detailed Description of Modalities of the Invention
    [049] The cutting insert according to a first embodiment of the invention is shown in figures 1-4. Polygonal abasic and comprises an upper side (2) defining an upper extension plane (Pu) and an identical lower side (3) defining a lower extension plane (PL), which is parallel to the upper extension plane (Pu). A central axis (C2) extends perpendicularly through the upper extension plane (Po) and the lower extension plane (PL). The upper side (2) and the lower side (3) are connected by a lateral surface ( 4), which comprises several main clearance surfaces (5, 15) and secondary clearance surfaces (6a, 6b, 16a, 16b). Around the upper side (2), seven identical and alternatively usable cutting edges ( 7). Each cutting edge comprises a main cutting edge portion (8) of chip removal, essentially straight, and a first and second secondary cutting edge portion (9, 10), formed as eccentric-type surface edges. The main cutting edge portion (8) is formed in a transition between the upper side (2) and one of the upper main gap surfaces (5). The first secondary cutting edge portion (9) is formed in a transition between the upper side (2) and a first upper secondary clearance surface (6a), in a region between two main cutting edge portions (8), that is, in a corner region of the cutting insert (1). The second portion of secondary cutting edge (10) is formed at a transition between the upper side (2) and a second upper secondary clearance surface (6b). The first secondary cutting edge portion (9) is configured here to act as a secondary eccentric-type surface edge, when the cutting insert (1) is mounted on a milling tool with an entry angle (K) of approximately 25 ° . If, instead, the cutting insert (1) is mounted with an entry angle (K) of approximately 42 °, the first secondary cutting edge portion (9) will act as a corner edge, while the second secondary cutting edge portion (10), with this entry angle is configured to act as a secondary edge of an eccentric type surface. Therefore, the cutting insert (1) according to this modality can be used for two different entry angles. The edge portions between the main cutting edge portion (8), the first secondary cutting edge portion (9), the second secondary cutting edge portion (10) and the following main cutting edge portion (8) are formed as radial transitions.
    [050] The cutting insert (1) further comprises a lowered top surface (11), which extends in parallel to the upper extension plane (Pu). An upper chip surface (12) extends in the region between the upper cutting edges (7) and the upper base surface (11). In addition, between the cutting edges (7) and the base surface (11) extends a reinforcement region (13). The cutting insert (1) in this first modality also comprises, on its lateral surface, several recessed support surfaces (14), making it seen in figures 4a and 4b, the radial distance measured from the central axis (C2) to the surface lowered support bracket (14), under one of the main cutting edge portions (8), is equal to the radial distance from the central axis (C2) to the main cutting edge portion (8). However, in the corner region, the corresponding distance between the lowered support surface (14) and the central axis (C2) is less than the distance from the central axis (C2) for the secondary cutting edge portions (9, 10). Thus, transition surfaces are formed between the recessed support surface (14) and the clearance surfaces (5, 6a, 6b).
    [051] As can be seen in figure 2, the main clearance surface (5) is formed with an obtuse internal angle (a), in relation to the upper extension plane (Pu), as seen in the lateral frontal projection view. In figure 4a, a partial cross section taken along the main clearance surface shows the obtuse angle (a). In this embodiment, the internal angle (a) is 107 °. The secondary clearance surfaces (6a, 6b) are formed with internal angles (βi, β2), in relation to the upper extension plane (Pu), as seen in the lateral frontal projection view. This, in figure 4b, is shown in cross section for the second upper secondary clearance surface (6b), formed with an angle βz = 97 °, and in figure 4c, shown in cross section for the first upper secondary clearance surface ( 6a), formed with an angle βi = 90.5 °.
    [052] The cutting insert (1) is interchangeable in different interchange positions. In an interchange position, one of the upper cutting edges (7) is a cutting edge, where the upper side (2) partially forms an exit surface. and the lower side (3) forms a support surface that rests on a base support surface of a milling tool insert seat. In another interchangeable position, an edge of a number of lower cutting edges (17) extends around the lower side (3) is cutting, where the lower side (3) partly forms an exit surface and the side upper part (2) forms a support surface that rests on a base support surface of the insert seat.
    [053] Figures 15-19 show the cutting insert (1) according to a variety of the first embodiment of the invention, mounted on a milling tool (101), according to the invention. The milling tool (101) comprises a tool body (102) and several cutting inserts (1). The tool body (102) includes a front end (104) and a rear end (105), between which extends a central axis of rotation (Cl). The tool is rotatable in a direction of rotation (R) around the central axis of rotation (Cl) and an envelope surface (106) is concentric with the axis (Cl). Several tablet seats (107) are formed in a transition between the front end (104) and the wrap surface (106). Each insert seat (107) comprises a base support surface, against which the lower side (3) of the cutting insert (1) rests, a side support comprising two lateral support surfaces, against which two of the support surfaces recessed support (14) are supported, and a chip pocket (110) provided in front of the insert seat (107), in the direction of rotation (R) of the tool. The cutting inserts (1) are mounted firmly and detachable on the insert seats (107) by means of a screw (111).
    [054] The tool shown in figures 15-19 is configured so that the main cutting edge portion (8) of chip removal has an entry angle (K) of about 42 °, so that the first secondary cutting edge portion (9) acts as a corner edge, while the second secondary cutting edge portion (10) acts as a secondary eccentric surface edge. The entry angle (K) is the angle that the main cutting edge portion (8) makes with the feed direction of the milling tool, as seen in the side frontal projection view, shown in figure 19. 0 entry angle (K) is more specifically defined as the angle between a plane (Ptan) θ a plane (Pf) measured in a reference plane (Pref2), whose planes (Ptan), (Pf) and (Pref2) will be defined below. The entry angle varies along the edge, even though the edge is straight. The cutting insert (1) is pointed, so that the upper extension plane (Po) has a negative radial apex angle (yf) of -35 °. The radial vertex angle (Yf) shown in figure 18 is the angle between the upper extension plane (Pu) and a line along the radial vector (r) of the tool, as seen in a plan view. More specifically, the radial apex angle (Yf) is obtained by taking a plane (Pf) normal to the central axis of rotation (Cl) and passing through a point (pk), and in the plane (Pf), measuring the angle between a reference plane (Pref) and the upper extension plane (Pu) / as shown in figure 18, which is a view taken on the plane (Pf). The reference plane (Pref) is a plane covered by the central axis of rotation (Cl) and a radial vector (r), perpendicular to the central axis of rotation (Cl) and passing through the point (pk). The radius (r) of the tool is measured between the central axis of rotation (Cl) and the point (pk), which for this cutting insert (1) is positioned at the transition between the main cutting edge portion (8) and the adjacent second secondary cutting edge portion (10), in this embodiment, a secondary edge of an eccentric type surface. With a negative radial apex angle (Yf) / ° upper extension plane (Pu) it is directed outwards, with respect to the central axis of rotation (Cl) of the tool. The cutting insert (1) also has a point shape, so that the upper extension plane (Pu) is a negative axial apex angle (Ym) of -10 °. The axial apex angle (Ym) shown in figure 17 is the angle between the upper extension plane (Pu) and the central axis of rotation (Cl) of the tool. More specifically, the axial vertex angle (Ym) is obtained by measuring the angle between the upper extension plane (Pu) and the reference plane (Pref) in a plane (Pm) (not shown), whose plane (Pm) it is perpendicular to the upper extension plane (Pu), parallel to the central axis of rotation (Cl) and passes through the point (p ^). With a negative axial apex angle (Ym), the upper extension plane (Pu) is tilted towards the front end (104) of the milling tool. With an entry angle (K) of approximately 42 °, a radial apex angle (Yf) of -35 ° and an axial apex angle (ym) of -10 °, the main cutting edge portion (8) it has an inclination angle (À) of approximately 20 °. The angle of inclination (À), shown in figure 20, is the angle that the main cutting edge portion (8) at a point (pa), or a tangent (t) to the main cutting edge portion (8) at that point it makes a second reference plane (Prefz) • The second reference plane (Pref2) is parallel to and includes the central axis of rotation (Cl), including the point (pa) on the main cutting edge portion ( 8). The inclination angle (À) is measured in a tangential plane (Ptan) ■ The tangential plane (Ptan) is tangential to the main cutting edge portion (8) at the point (pa) and perpendicular to the second reference plane (Pref2) ■ In figure 20 the angle of inclination (À) is shown, looking at the main cutting edge portion (8) from below the front end (104) of the tool (101), along a line that is normal to the tangential plane (Ptan) - For the inclination angle (À) it is approximately constant along the main cutting edge portion (8), since the main cutting edge portion (8) is substantially straight. For a curved main cutting edge portion, the angle of inclination will vary along the edge.
    [055] With the cutting insert (1), according to the first modality, mounted on the milling tool (101) as described above, the clearance behind the main cutting edge portion (8) in the direction of rotation ( R) of the tool is optimized with respect to the obtuse internal angle (a), so that the cutting insert (1) has a high resistance, while still providing sufficient clearance. The clearance behind the secondary cutting edge with an eccentric surface (10) is sufficient, thanks to the negative axial vertex angle (Ym) ■ With the values chosen for the internal angles (α), (βx) and (β2), the gap behind the main cutting edge portion (8) and the secondary cutting edges with an eccentric type surface (9, 10) are arranged in a suitable range. The recessed upper base surface (11) ensures that a positive exit angle is obtained, despite the large negative radial apex angle (yd. For this purpose, the base surface (11) in this modality is formed at a distance of 1 , 2 mm from the main cutting edge portion (8) .The chip surface (12) is arranged on the main portion of the main cutting edge (8), inclined at an angle ((pi) between 40 ° and 55 °, in the present case, of approximately 44 °, with respect to the upper extension plane (Pu) .The reinforcement region (13) has an angle (cp2) between 25 ° and 45 °, as shown in figure 4a. recessed support (14) formed on the side surface (4) of the cutting insert (1) provide a large support area that rests on the side support surfaces of the milling tool (101), which prevents the rotation of the cutting insert ( 1) inside the insert seat (107) of the milling tool (101).
    [056] The milling tool on which the cutting insert (1), according to the first mode is mounted, can instead be configured for an entry angle (K) of approximately 25 °, in which case , the first secondary cutting edge portion (9) functions as a secondary edge of an eccentric type surface. The second portion of the secondary cutting edge (10) is for moderate cutting depths, not active as the cutting edge. However, the second secondary cutting edge portion (10), adjacent to the active main cutting edge portion (8), can be used as an extension of the main cutting edge portion (8), if the cutting depth is big. For an entry angle (K) of approximately 25 °, the axial apex angle (Ym) can be set to -17 °, and the radial apex angle (Yf) to -45 °, in which case, the angle of inclination (À) is approximately 33 °. It is preferable to adjust the radial and axial corner angles, so that the angle of inclination (À) is within the range of 15 ° i À 50 °.
    [057] Additional cutting insert modalities (1) will now be described. It should be noted that the same reference signs designate the same or similar element in all the disclosed modalities.
    [058] A second cutting insert embodiment according to the invention is shown in figures 5-6. The cutting insert (1), according to this modality, differs only from the cutting insert of the first modality in that it does not have lowered support surfaces. Instead, the side surface (4) extends without recesses, from the upper cutting edges (7) to the lower cutting edges (17), including upper clearance surfaces (5, 6a, 6b) and lower clearance (15, 16a, 16b). The side surface (4) also includes non-recessed support surfaces (14) that extend between the main gap surfaces (5, 15).
    [059] A third embodiment of the cutting insert according to the invention is shown in figures 7-9. The cutting insert (1), according to this modality, is also double-sided and interchangeable, differing from the cutting insert of the first modality in that it comprises upper cutting edges (7), each of these, including a portion of main cutting edge (8) and a secondary cutting edge portion (9), which is in the form of a secondary edge with an eccentric type surface. A radial transition is provided between the secondary cutting edge portion (9) and the subsequent main cutting edge portion (8). Since the cutting insert (1) is double-sided, the lower side (3) is identical to the upper side (2), with lower cutting edges (17) extending around the lower side (3). The cutting insert (1), according to this modality, also differs from the cutting insert of the first modality in that it does not have a reinforcement region. Instead, the upper side (2) is formed with a chip surface. (12) extending between the upper cutting edges (7) and a lowered upper base surface (11). The cutting insert (1) also differs with respect to the side surface model (4). Here, the side surface (4) comprises upper and lower main clearance surfaces (5, 15), and a secondary clearance surface (6 ) that extends substantially between the upper secondary cutting edge portion (9) and a corresponding lower secondary cutting edge portion (19). The recessed support surfaces (14) are rounded, being formed just below the edge portions top cutting edge (8). As can be seen in figures 9 to 9c, the upper main gap surface is formed with an obtuse internal angle (a) of 107 ° with respect to the upper extension plane (Pu), while the secondary gap surface (6) is formed with an internal angle close to straight (β) in relation to the upper extension plane (Pu). With these angles, the cutting insert is optimized, with slightly negative axial apex angles and markedly negative radial apex angles, the clearances behind the main cutting edge portion (8) and the secondary cutting edge portion (9) are placed within a suitable range.
    [060] A fourth modification of the cutting insert according to the invention is shown in figure 10. The cutting insert (1) according to this modality differs only from the cutting insert according to the third modality in which it does not features lowered support surfaces. Instead, the side surface (4) extends without recesses, from the upper cutting edges (7) to the lower cutting edges (17), including the upper main clearance surfaces (5), main clearance surfaces lower (15), and non-recessed support surfaces (14), extending between the main clearance surfaces (5, 15) and secondary upper and lower clearance surfaces (6, 16).
    [061] A fifth embodiment of the cutting insert according to the invention is shown in figures 11-13. The cutting insert (1) according to this modality differs from the cutting insert of the third modality in that instead of a secondary cutting edge with an eccentric surface, the secondary cutting edge portion (9) is formed as a curved cutting edge (9), with a corner radius defining the radius of curvature. The curved cutting edge portion (9) extends between two adjacent main edge portions (8). The cutting insert according to this modality differs from the cutting insert of the third modality in that it comprises a reinforcement region (13) extending between the upper cutting edges (7) and the upper chip surface (12). As in the third embodiment, the lateral surface (4) is formed with rounded recessed support surfaces (14), arranged below the upper main clearance surfaces (5). The secondary gap surface (6) is formed as a curved surface, with a gradual transition between the primary gap surface (5) and the secondary gap surface (6). Since the cutting insert (1), according to the fifth modality is formed with curved cutting edges (9) and with a corner radius, the cutting insert according to the present modality has a reflected symmetry with respect to to the line shown in figure 12, that is, a bisector cutting the curved cutting edge (9) in two equal parts. As can be seen in figure 13, the secondary clearance surface (6), below the bisector, is formed with a right angle (β) in relation to the upper extension plane (Pu), while the main clearance surface (5) it is formed with an obtuse internal angle (a) of approximately 107 °. With a cutting insert (1) according to the present modality, mounted on a milling tool with a negative radial apex angle (yf) of -35 ° and a negative axial apex angle (Ym) of -10 °, the functional clearance behind the main cutting edge portion (8) and behind the secondary cutting edge portion (9) is approximately 10 °.
    [062] A sixth modality of the cutting insert according to the invention is shown in figure 14. The cutting insert (1), according to this modality, differs from the cutting insert of the fifth modality only in that it does not have surfaces recessed support surfaces, instead, have non-recessed support surfaces (14) below the upper main clearance surfaces (5).
    [063] A seventh modality of the cutting insert according to the invention is shown in figures 21a and 21b. The cutting insert according to this embodiment differs from the cutting insert of the first embodiment in that a terminal portion (8a) of the main cutting edge portion (8) forms a recess (8b), as seen in a view from above. lateral frontal projection of the insert, so that the terminal portion (8a) of the main cutting edge portion (8) is positioned below a successive secondary cutting edge portion (9, 10), with respect to the extension plane upper (Pu). A reliable gap between the workpiece and an inactive main cutting edge portion (8), adjacent to an active secondary cutting edge portion (9, 10) is thereby obtained. Consequently, the recess (8b) in the end portion (8a) of the inactive main cutting edge (8), located radially within an active secondary cutting edge portion (9, 10) during milling (see figure 19) provides clearance for the machined surface (Pf). This modality is also double-sided, with the lower side (3) identical to the upper side (2), so that the cutting insert is interchangeable in seven different interchange positions on the upper side (2) and different interchange positions on the lower side (3).
    [064] An eighth modality of the cutting insert according to the invention is shown in figures 22a and 22b. The cutting insert according to this modality differs only from the cutting insert of the first modality in that a terminal portion (5a) of the main clearance surface (5) in a terminal portion (8a) of the main cutting edge portion it has a smaller internal angle than the obtuse internal angle (a) of the remaining main clearance surface. The end portion (5a) of the main clearance surface (5) can be provided with an internal angle of around 90 °, or in the same range as the internal angle provided on the secondary clearance surface. This modality provides another way to obtain a reliable gap between the workpiece and an inactive main cutting edge portion (8), adjacent to an active secondary cutting edge portion (9, 10). The end portion (5a) of the main clearance surface (5) on the end portion (8a) of the inactive main cutting edge (8) is positioned radially within an active secondary cutting edge portion (9, 10) during milling (see figure 19) and provides clearance for the machined surface (Pf). This modality is also double-sided, with the lower side (3) identical to the upper side (2), so that the cutting insert is interchangeable in seven different interchange positions on the upper side (2) and seven different interchange positions on the bottom side (3).
    [065] A ninth modality of the cutting insert according to the invention is shown in figures 23a and 23b. The cutting insert according to this modality differs only from the cutting insert of the first modality in that the main cutting edge portion (8 ') is inclined, as seen in a lateral frontal projection view of the cutting insert, in so that the main cutting edge portion (8 ') is disposed in relation to the upper extension plane (Pu), towards an end of the main cutting edge portion (8'), where a terminal portion ( 8a) the main cutting edge portion (8 ') is positioned below a successive secondary cutting edge portion (9, 10), with respect to the upper extension plane (Pu). This mode also obtains a reliable clearance between the workpiece (Pf) (see figure 19) and an inactive main cutting edge portion located radially inside an adjacent and active secondary cutting edge portion (9, 10) , during the milling procedure. There may be a risk that at least one end portion (8a) of the active main cutting edge portion and, specifically, of its main clearance surface (5), adjacent to the active secondary cutting edge portion (9,10) , is collided with the workpiece (surface (Pf)), during the milling procedure. Thus, the clearance is obtained by tilting the portion of the main (inactive) cutting edge (8 '), so that at least its end portion (8a) is positioned below the successive secondary (active) cutting edge portion (9, 10), in relation to the upper extension plane (Pu). Figures 23a and 23b show a portion of the main cutting edge being formed as a straight edge (8 '), having a constant slope along the entire length of the cutting edge (8'). However, it can be partially inclined or curved, as seen in a side frontal projection view of the cutting insert, as the end portion (8a) is positioned below the secondary cutting edge portion (9, 10).
    [066] Figures 24a and 24b show a tenth and eleventh embodiment, respectively, of a transition between the inclined main cutting edge portion (8 ') and the secondary cutting edge portion (10) of the ninth embodiment. The end portion (8a) of the main cutting edge portion (8 ') is thereby connected or includes an upward transition edge (8c), connected to the successive secondary cutting edge portion (10). The upward transition edge (8c) is relatively short and used to connect the terminal cutting edge portion (8a) with the successive secondary cutting edge portion in a smooth manner, thereby avoiding sharp / sharp corners. This practically increases the resistance of the cutting edge line in the transition between the cutting edge portions. In the tenth embodiment shown in figure 24a, the end portion (8a) of the main inclined cutting edge portion (8 ') partially extends in and thereby lowers (removes) a small part of the secondary cutting edge portion (10 ), where an upward transition edge (8c) is formed and connected with the secondary cutting edge portion (10). In the eleventh embodiment shown in figure 24b, the end portion (8a) of the inclined main cutting edge portion (8 ') includes an upward transition edge (8c) connected to the successive secondary cutting edge portion (10). [067] The invention is not limited to the modalities disclosed herein, it can be varied and modified within the scope of the attached claims. Thus, for example, the cutting edges may include main curved cutting edge portions, the cutting insert may be single-sided with cutting edges extending only around the top side, a cutting insert with a cutting edge portion. secondary curved cut with a corner radius that can be formed with flat recessed side support surfaces, instead of rounded ones, the insert geometry can be with or without reinforcement region / regions, the reinforcement region and / or the chip surface it can be in the form of curved surfaces, or the cutting insert can be formed with a greater number of cutting edges, such as eight cutting edges or more. The cutting insert can be designed for rotation to the left of the tool, as well as for rotation to the right of the tool. The cutting insert can also, instead of being mounted by screw, be fixed, for example, by means of a clamp. Numerical Reference List (1) - cutting insert; (2) - upper side; (3) - bottom side; (4) - lateral surface; (5) - upper main clearance surface; (5a) - terminal portion of the upper main clearance surface; (6) - secondary clearance surface; (6a, 6b) - upper secondary clearance surfaces; (7) - upper cutting edges; (8) - upper main cutting edge portion; (8 ') - portion of inclined upper main cutting edge; (8a) - terminal portion of the main cutting edge portion; (8b) - recess formed by the terminal portion; (8c) - transition edge; (9) - upper secondary cutting edge portion; (10) - upper secondary cutting edge portion; (11) - base surface; (12) - chip surface; (13) - reinforcement region; (14) - support surfaces; (15) - lower main clearance surface; (16) - lower secondary clearance surface; (16a, 16b) - lower secondary clearance surfaces; (17) - lower cutting edges; (18) - lower main cutting edge portion; (19) - lower secondary cutting edge portion; (101) - milling tool; (102) - tool body; (104) - front end; (105) - rear end; (106) - wrapping surface; (107) - tablet seat; (110) - chip bag; (111) - screw; (Pu) ~ upper extension plane; (PL) ~ lower extension plane; (Pref) ~ reference plane; (Pref2) ~ second reference plane; (Ptan) - tangential plane; (Pf) - plan; (Pm) - plan; (Pk) “point; (Pa) - point; (Cl) - central axis of rotation of the milling tool; (C2) - central axis of the cutting insert; (r) - radial vector; (t) - tangent; (K) - entry angle; (À) - angle of inclination; (Yf) - radial apex angle; (Ym) “axial apex angle; (α) - internal angle between (Pu) and the main clearance surface; (β, βi, βa) - internal angles between (Pu) and secondary clearance surface; (<Pi) - angle between (Pv) and the chip surface; (cp2) “angle between (Pu) and the reinforcement region.
    权利要求:
    Claims (19)
    [0001]
    1. Interchangeable cutting insert (1) for a milling tool (101), the cutting insert comprising: -a top side (2) defining an upper extension plane (Pσ); -a lower side (3) defining a lower extension plane (PL), parallel to the upper extension plane (Pu); wherein a central axis (C2) extends perpendicularly through the upper extension plane (Pu) and the lower extension plane (PL); -a lateral surface (4) connecting the upper side (2) and the lower side (3), the lateral surface (4) comprising a plurality of main upper clearance surfaces (5) and secondary clearance surfaces (6, 6a, 6b); and -at least six identical and alternatively usable upper cutting edges (7) extending around the upper side (2), where each cutting edge (7) comprises a main chip removal cutting edge portion (8) , and at least a secondary cutting edge portion (9, 10), wherein the main cutting edge portion (8) is formed in a transition between the upper side (2) and one of said main upper clearance surfaces ( 5), and the secondary cutting edge portion (9, 10) is formed at a transition between the upper side (2) and one of said secondary gap surfaces (6, 6a, 6b), in a region between two edge portions of main section (8), where each of the said upper main gap surfaces (5) is formed with an obtuse internal angle (a), in relation to the upper extension plane (Pu), as seen in a lateral frontal projection view, characterized by the fact that the internal angle (a) between the extension plane exceeds or (Pσ) and each of the said main upper clearance surfaces (5) is available within the range of 100 ° <α <118 °.
    [0002]
    2. Cutting insert according to claim 1, characterized by the fact that the internal angle (a) between the upper extension plane (Pu) and each of the said main upper clearance surfaces (5) is within the range 100 ° <ot <114 °.
    [0003]
    3. Cutting insert according to claim 1 or 2, characterized in that the upper side (2) comprises a lowered upper base surface (11), which extends in parallel to the upper extension plane (Pu) , and an upper chip surface (12) that extends between the upper cutting edges (7) and the upper base surface (11), where a chip surface angle (cpi) is preferably located within the 35 ° range <(pi <55 °, more preferably, in the 40 ° range <cpi <55 °, with respect to the upper extension plane (Pu) and along the main cutting edge portion (8).
    [0004]
    4. Cutting insert according to claim 3, characterized in that the upper side (2) further comprises at least an upper reinforcement region (13) connecting the upper cutting edges (7) with the upper chip surface ( 12).
    [0005]
    5. Cutting insert according to any of the preceding claims, characterized by the fact that each of said secondary clearance surfaces (6, 6a, 6b) is formed with an internal angle (β) with respect to the upper extension plane ( Pu), as seen in a frontal frontal projection view, where (β) <(α).
    [0006]
    6. Cutting insert according to claim 5, characterized by the fact that the internal angle (β) between the upper extension plane (Pu) and the secondary clearance surface (6, 6a, 6b), below at least at least a part of the secondary upper cutting edge (9, 10) is within the range of 85 ° <β <100 °.
    [0007]
    7. Cutting insert according to any of the preceding claims, characterized in that the cutting insert (1) comprises at least seven identical and alternatively usable upper cutting edges (7).
    [0008]
    8. Cutting insert according to any of the preceding claims, characterized by the fact that the cutting insert (1) is double-sided, where the bottom side (3) is identical to the top side (2).
    [0009]
    Cutting insert according to any one of the preceding claims, characterized in that the lateral surface (4) comprises a plurality of recessed support surfaces (14).
    [0010]
    10. Cutting insert according to any of the preceding claims, characterized in that the main cutting edge portion (8) is straight.
    [0011]
    Cutting insert according to any of claims 1-10, characterized in that an end portion (8a) of the main cutting edge portion (8) forms a recess (8b), as seen in a projection view front side of the insert, so that the end portion (8a) of the main cutting edge portion (8) is located below a successive secondary cutting edge portion (9, 10), with respect to the upper extension plane ( Pu).
    [0012]
    Cutting insert according to any of the preceding claims, characterized in that an end portion (5a) of the main gap surface (5) in an end portion (8a) of the main cutting edge portion (8) it has an internal angle smaller than the obtuse internal angle (a) of the remaining main clearance surface (5).
    [0013]
    13. Cutting insert according to any of the preceding claims, characterized by the fact that the main cutting edge portion (8 ') is inclined, when viewed in a lateral frontal projection view of the cutting insert, so that the main cutting edge portion (8 ') is disposed in relation to the upper extension plane (Pu), towards an end of the main cutting edge portion (8'), in which a terminal portion (8a) the main cutting edge portion (8 ') is located below a successive secondary cutting edge portion (9, 10), with respect to the upper extension plane (Pu).
    [0014]
    14. Cutting insert according to claim 13, characterized in that the end portion (8a) of the main cutting edge portion (8 ') comprises an upward transition edge (8c), connected to the successive portion of secondary cutting edge (9, 10).
    [0015]
    15. Cutting insert according to any of the preceding claims, characterized in that the secondary cutting edge portion) 9) is arranged in the form of a curved edge portion, extending between two adjacent cutting edge portions main (8) and having at least one radius of curvature.
    [0016]
    16. Cutting insert according to any one of the preceding claims, characterized in that at least a portion of the secondary cutting edge (9, 10) is provided in the form of a secondary edge of an eccentric type surface.
    [0017]
    17. Cutting insert according to claim 16, characterized in that each upper cutting edge (7) comprises a first and a second secondary edge of an eccentric type surface (9, 10), formed at an angle relatively between itself, as seen in a flat view.
    [0018]
    18. Top milling tool (101), configured for chip removal machining, comprising a tool body (102), including a front end (104) and a rear end (105), including a central axis of rotation (Cl) extends, around which the tool (101) is rotatable in a direction of rotation (R), and at least one insert seat (07) is formed at the transition between the front end (104) and a surface wrap (106), which extends between the front end (104) and the rear end (105) of the tool body (102), said at least one insert seat (107) comprising a base support surface, in that a chip pocket (110) is provided in front of said at least one insert seat (107), in the direction of rotation of the tool, characterized by the fact that the tool (101) comprises at least one cutting insert (1 ), according to any of claims 1-17, mounted firmly and d at least one tablet seat (107) is stable in said.
    [0019]
    19. End milling tool (101) according to claim 18, characterized in that the tool is configured so that a portion of the main cutting edge (8) is provided with an entry angle (K ) less than 80 °, and so that the upper extension plane (Pu) of the cutting insert is, on the one hand, radially pointed with at least one radial apex angle (Yf), within the range of -60 ° < Yf - -25 °, and on the other hand, axially pointed with an axial apex angle (Ym) r within the range of -20 ° Ym 0o.
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    同族专利:
    公开号 | 公开日
    US20150190869A1|2015-07-09|
    JP6704223B2|2020-06-03|
    EP2893995A1|2015-07-15|
    RU2014152686A|2016-07-10|
    JP2015128816A|2015-07-16|
    CN111822766A|2020-10-27|
    KR20150083034A|2015-07-16|
    BR102015000380A2|2016-10-25|
    EP2893996A1|2015-07-15|
    RU2678554C2|2019-01-29|
    US9975188B2|2018-05-22|
    CN104759675B|2021-07-06|
    RU2014152686A3|2018-08-01|
    KR102263555B1|2021-06-09|
    CN104759675A|2015-07-08|
    EP2893995B1|2019-03-27|
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    法律状态:
    2016-10-25| B03A| Publication of a patent application or of a certificate of addition of invention [chapter 3.1 patent gazette]|
    2018-10-30| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-02-18| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-07-21| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-11-24| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 08/01/2015, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP14150475.3|2014-01-08|
    EP14150475.3A|EP2893995B1|2014-01-08|2014-01-08|A metal cutting insert and a milling tool|
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