• 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:
    In a rotary cutting tool (52) used for milling operations, a reversible cutting insert (20) is removably attached to a cutting body (54). The cutting insert (20) has two opposite end surfaces (22) interconnected by means of a continuous peripheral surface (24), which includes three side surfaces (26) which alternate with three corner surfaces (28). The side and corner surfaces (26, 28) intersect with both end surfaces (22) at the side and corner edges (32, 34), respectively, with each side edge (32) having a main cutting edge ( 36) and each corner edge (34) having a smaller and corner cutting edge (38, 40). Each minor cutting edge (40) has a projected shorter cutting length (LM) in an end view and each associated minor relief surface (48) has a smaller relief width (W) between two lateral boundary points contained in a horizontal plane (PH), which varies with a displacement distance (DO) between the horizontal plane (PH) and a median plane (M). Each projected minor cut length (LM) is greater than the maximum minor relief width (WMAX) of its associated minor relief surface (48).
    公开号:BR112017004438B1
    申请号:R112017004438-2
    申请日:2015-08-11
    公开日:2021-03-02
    发明作者:Assaf Ballas
    申请人:Iscar Ltd.；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    [001] The present invention relates to cutting inserts and cutting tools to be used in metal cutting processes, in general, and to rotary cutting tools that have reversible cutting inserts for milling operations, in particular. BACKGROUND OF THE INVENTION
    [002] In the area of rotary cutting tools used in milling operations, there are many examples of reversible cutting inserts that are removably attached to a cutting body. In some cases, these cutting tools are configured to perform square edge milling operations.
    [003] Document No. US 2013/0004251 describes a removable insert having a triangular shape with an upper surface and a lower surface, as well as a circumferential surface that connects said surfaces and the cutting edges around the corners. The main cutting edges are present on the top and bottom surfaces along the longitudinal edges. Each main cutting edge has a second, smaller cutting edge associated with the main cutting edge only. The second cutting edges, figuratively, are formed by trimming the corners in each case preceding from the upper surface and the lower surface. The second cutting edges are contiguous to the two main cutting edges and extend at different angles to it.
    [004] Document No. US 8,708,616, in common with the present invention, describes a reversible cutting insert having two opposite end surfaces interconnected by a continuous peripheral surface, which includes three side surfaces that alternate with three surfaces of corner. The side and corner surfaces intersect with both end surfaces at the side and corner edges, respectively, where each side edge has a main cutting edge and each corner edge has a smaller and corner cutting edge. Each major and minor cutting edge slopes away from the first and second end points, respectively, and correspondingly the associated cutting and corner edge towards the median plane. The minor relief surface associated with each minor cutting edge is perpendicular to the median plane and has a constant width.
    [005] It is an objective of the present invention to provide a cutting insert and a cutting tool that promotes improved surface finishes for a part being machined.
    [006] Another objective of the present invention is to provide an improved cutting insert with a smaller compact relief surface and a relatively long smaller cutting edge or cleaner.
    [007] Additionally, it is an objective of the present invention to provide an improved cutting insert that has two main cutting edges per side surface.
    [008] Furthermore, it is also an objective of the present invention to provide an improved cutting insert that has robust cutting edges.
    [009] Additionally, it is still an objective of the present invention to provide an improved cutting tool capable of performing square edge milling operations. SUMMARY OF INVENTION
    [0010] In accordance with an aspect of the present invention, a reversible cutting insert is provided, comprising: the first and the second opposite end surfaces which are interconnected by means of a continuous peripheral surface with a median plane located between the first and the second end surfaces and which intersect the peripheral surface to form an insert boundary line and an insert geometric axis perpendicular to the median plane around which the cutting insert is removable, the peripheral surface includes three surfaces side that alternate with three corner surfaces, the side and corner surfaces intersect both the first and the second end surfaces at the side and corner edges, respectively, with each side edge having a main cutting edge, and each corner edge has a smaller and corner cut edge, and each corner surface has two smaller relief surfaces, each supple The small relief surface extends away from the associated minor cutting edge, where the first imaginary straight line extends perpendicular to the median plane and intersects with any of the cutting and corner edges at any point along the length, which passes across the median plane within the insert boundary line, and where: each shorter cut edge has a smaller cut length projected, in an end view of the cut insert along the insert geometric axis, each relief surface smaller has a smaller relief width between two lateral border points of the minor relief surface contained in a horizontal plane perpendicular to the geometric axis of the insert, the smaller relief width varies with a displacement distance between the horizontal plane and the median plane, and each projected minor cut length is greater than the maximum minor relief width of its associated minor relief surface.
    [0011] In accordance with another aspect of the invention, a rotary cutting tool is provided around the geometric axis of the tool, comprising a cutting body having an insert receiving pouch, and at least one removable cutting insert so as to the type described above is removably attached to the insert receiving bag. BRIEF DESCRIPTION OF THE DRAWINGS
    [0012] In order to be better understood, the invention will now be described, by way of example only, with reference to the accompanying drawings in which the dashed lines represent cut-off limits for partial views of a limb and in which: Figure 1 is a perspective view of a cutting insert according to some embodiments of the present invention; Figure 2a is an end view of the cutting insert shown in Figure 1; Figure 2b is a detailed end view of the cutting insert shown in Figure 1; Figure 3a is a side corner view of the cutting insert shown in Figure 2a, seen along a vertical foreground PV1; Figure 3b is a detailed side corner view of the cutting insert shown in Figure 3a; Figure 4 is a side view of the cutting insert shown in Figure 2a, seen along a vertical second plane PV2; Figure 5 is a partial cross-sectional view of the cutting insert shown in Figure 2b, taken along line V-V; Figure 6 is a partial cross-sectional view of the cutting insert shown in Figure 2b, taken along line VI-VI; Figure 7 is a partial cross-sectional view of the cutting insert shown in Figure 2b, taken along line VII-VII; Figure 8 is a perspective view of a cutting tool according to some embodiments of the present invention; Figure 9 is a side view of the cutting tool shown in Figure 8; Figure 10 is an end view of the cutting tool shown in Figure 8; and Figure 11 is a diagrammatic representation of the contour lines inscribed by the operating cutting edges of the cutting tool illustrated in Figure 10, in a radial plane Pr. DETAILED DESCRIPTION OF THE INVENTION
    [0013] The present invention relates to a reversible cutting insert 20, as illustrated in Figures 1 and 2a, which has the first and second opposite end surfaces 22 interconnected by means of a continuous peripheral surface 24, the peripheral surface 24 includes three side surfaces 26 that alternate with three corner surfaces 28.
    [0014] In some embodiments of the present invention, the cutting insert 20 can preferably be manufactured in a pressed form and by sintering cemented carbide, such as tungsten carbide and can be coated or uncoated.
    [0015] As shown in Figures 3a and 4, the cutting insert 20 has a median plane M located between the first and second end surfaces 22 and which intersect with the peripheral surface 24 to form an insert boundary line Lb.
    [0016] In some embodiments of the present invention, the cutting insert 20 can be configured so that in an end view, as shown in Figure 2a, no portion of the cutting insert 20 extends beyond the border line of the insert Lb.
    [0017] As shown in Figures 3a and 4, the cutting insert 20 has an insert geometric axis A1 perpendicular to the median plane M around which the cutting insert 20 is removable.
    [0018] In some embodiments of the present invention, a through hole 30 coaxial with the insert geometric axis A1 can extend in and out of both the first and second end surfaces 22.
    [0019] Furthermore, in some embodiments of the present invention, the three side surfaces 26 can be identical and the three corner surfaces 28 can be identical.
    [0020] Additionally, in some embodiments of the present invention, the peripheral surface 24 may have exactly three side surfaces 26 that alternate with exactly three corner surfaces 28 and the cutting insert 20 may exhibit triple rotational symmetry around the geometric axis of insert A1.
    [0021] As shown in Figure 2a, the cutting insert 20 can have the basic shape of an equilateral triangle in an end view.
    [0022] In some embodiments of the present invention, the cutting insert 20 can be manufactured directly pressed along the direction of the insert geometric axis A1.
    [0023] In addition, in some embodiments of the present invention, the cutting insert 20 can be pressed to its final shape and the peripheral surface 24 can be grounded.
    [0024] As shown in Figures 3a and 4, the side and corner surfaces 26, 28 intersect with both the first and the second end surface 22 at the side and corner edges 32, 34, respectively, with each side edge 32 having a main cutting edge 36 and each corner edge 34 having a smaller and corner cutting edge 38, 40.
    [0025] Thus, the cutting insert 20 is advantageously configured with two main cutting edges 36 per side surface 26 and two smaller and corner cutting edges 38, 40 per corner surface 28 and thus for modalities exhibiting rotational symmetry Triple around the geometric axis of insert A1, the cutting insert 20 has a total of six smaller, corner and main cutting edges 36, 38, 40.
    [0026] In some embodiments of the present invention, as illustrated in Figures 2a and 2b in an end view of the cutting insert 20 along the insert geometric axis A1 where each cutting edge and corner 38 can be curved and each smaller cutting edge 40 can be straight.
    [0027] In addition, in some embodiments of the present invention, the first and second end surfaces 22 may be identical, each having a support surface 42 substantially parallel to the median plane M.
    [0028] Additionally, in some embodiments of the present invention, the two support surfaces 42 can be equidistant from the median plane M.
    [0029] As shown in Figure 5, where each corner cutting edge 38 can be located completely further from the median plane M than each of the support surfaces 42.
    [0030] In some embodiments of the present invention, each corner surface 28 may include two corner relief surfaces in partial tapered shape 44, each corner relief surface 44 extending away from its associated corner cutting edge 38.
    [0031] It should be recognized that each corner relief surface in partially tapered shape 44, also known as a 'reversed' relief surface, which generally extends outward (that is, in a direction away from the geometric axis of the insert A1) of its cutting edge and associated corner 38 towards the median plane M, so that each cutting edge and corner 38 is beneficially supported and advantageously robust.
    [0032] As shown in Figures 2b and 5, an imaginary first straight line L1 extends perpendicular to the median plane M and intersects with any of the cut and corner edges 38 at any point along its length and passes through the plane median M within the insert boundary line Lb.
    [0033] It should be recognized that the first imaginary straight line L1 appears as a point in an end view of the cutting insert 20, as shown in Figure 2b.
    [0034] As shown in Figure 2a, each corner surface 28 is divided in half by a first vertical plane PV1, which contains the insert geometric axis A1, where each side surface 26 is divided in half by a second vertical plane PV2 containing the insert geometric axis A1.
    [0035] In some embodiments of the present invention, each first vertical plane PV1 can be coplanar with one of the second vertical planes PV2.
    [0036] In addition, in some embodiments of the present invention, each lateral surface 26 may have a median region of planar lateral 46 that is perpendicular to the median plane M. As shown in Figure 2b, each lateral median region 46 may form a first angle acute α1 with the first vertical plane PV1 of an adjacent corner surface 28 and the first angle α1 can have a value of 30 °.
    [0037] Additionally, in some embodiments of the present invention, each minor cutting edge 40 can form a second acute angle α2 with the associated first vertical plane PV1 (see Figure 2b) and a second angle α2 can have a value between 60 ° and 80 °.
    [0038] As shown in Figures 3 and 4, respectively, the median plane M crosses each first vertical plane PV1 to form a corner geometric axis Ac, and the median plane M crosses each second vertical plane PV2 to form a lateral geometric axis As .
    [0039] In some embodiments of the present invention, each corner surface 28 may exhibit double rotational symmetry around its associated corner geometric axis Ac.
    [0040] In addition, in some embodiments of the present invention, each side surface 26 may exhibit double rotational symmetry around its associated lateral geometric axis As.
    [0041] As shown in Figure 3b, each corner surface 28 has two minor relief surfaces 48, each minor relief surface 48 extends away from the associated minor cutting edge 40 and has a smaller relief width W between two lateral boundary points of the minor relief surface 48 which are contained in a horizontal plane PH perpendicular to the insert geometric axis A1.
    [0042] It should be recognized that the lateral border points of the minor relief surface 48 are points that border laterally with other sub-surfaces of the peripheral surface 24.
    [0043] In some embodiments of the present invention, as illustrated in Figure 6, an imaginary straight relief line LR is coplanar to the geometric axis of insert A1 and tangential to any point of the same or coincident with each minor relief surface 48 that may converge towards the insert geometric axis A1 in the same direction as the faces of the associated end surface. In this way, each minor relief surface 48 is also known as a 'reversed' relief surface, which is beneficially supported and advantageously robust.
    [0044] As illustrated in Figures 2b and 6, a second imaginary straight line L2 extends perpendicular to the median plane M and intersects with any of the minor cut edges 40 at any point along the length and can pass through the median plane M within the border line of insert Lb.
    [0045] It should be recognized that the second imaginary straight line L2 appears as a point in an end view of the cutting insert 20, as shown in Figure 2b.
    [0046] In some embodiments of the present invention, each minor relief surface 48 may be planar.
    [0047] In addition, in some embodiments of the present invention, the two minor relief surfaces 48 associated with each corner surface 28 may be spaced apart.
    [0048] In an end view of the cutting insert 20 along the insert geometric axis A1, as shown in Figure 2b, where each smaller cutting edge 40 has a shorter cut length projected LM.
    [0049] It should be recognized that the projected minor cut length LM of each minor cut edge 40 is the shortest distance measured between the two end points when it is projected on an imaginary plane perpendicular to the insert geometric axis A1.
    [0050] According to the present invention, the minor relief width W varies with a displacement distance Do between the horizontal plane PH and the median plane M, where each smaller cut length projected LM is greater than the width of WMAX maximum minor relief of its associated minor relief surface 48. This confronts the previously mentioned US No. 8,708,616 document, in which the minor relief surfaces associated with each minor cutting edge have a constant width.
    [0051] In some embodiments of the present invention, the minor relief width W varies continuously with the displacement distance Do, while in a subset of these modalities the minor relief width W varies continuously and linearly according to the distance of Do offset.
    [0052] It should be recognized that each minor cutting edge 40 can also be referred to as a cleaner and sets the LM projected shorter cutting length of each minor cutting edge 40 to be greater than the maximum minor WMAX relief width of its surface. associated minor relief 48, which promotes improved surface finishes to a part being machined using the cutting insert 20.
    [0053] In some embodiments of the present invention, the smaller relief width W may increase as the displacement distance Do increases.
    [0054] It should be recognized that when configuring the smaller relief width W to increase as the travel distance Do also increases, it results advantageously in a smaller compact relief surface 48 and a relatively long smaller cutting edge 40 or cleaner.
    [0055] In addition, in some embodiments of the present invention, the minimum minimum relief width WMIN of each minor relief surface 48 can occur at a displacement distance of Do which has a value equal to zero.
    [0056] As shown in Figure 3, each cutting and corner edge 38 extends between the first and second end points E1, E2.
    [0057] In some embodiments of the present invention, each corner cutting edge 38 may have a projected corner cutting length Lc in an end view of the cutting insert 20 along the insert geometric axis A1, as illustrated in Figure 2b, the projected shorter cut length LM of each minor cut edge 40 may be greater than the projected corner cut length Lc of its associated corner cut edge 38.
    [0058] It should be recognized that the projected corner cut length Lc of each corner cut edge 38 is the shortest distance measured between the first and second end points E1, E2, when projected on an imaginary plane perpendicular to the axis geometric insert A1.
    [0059] In some embodiments of the present invention, as illustrated in Figures 2b and 3b, each second endpoint E2 can be coincident with an endpoint of its associated minor cutting edge 40.
    [0060] In addition, in some embodiments of the present invention, as shown in Figure 3b, each major and minor cutting edge 36, 40 may tilt away from the first and second end points E1 and E2, respectively, of a associated corner cutting edge 38 towards the median plane M.
    [0061] In addition, in some embodiments of the present invention, each main cutting edge 36 can tilt mutually away from the associated corner cutting edge 38 towards the median plane M along the entire length.
    [0062] In addition, in some embodiments of the present invention, each main cutting edge 36 can intersect with its associated second vertical plane PV2. For these modalities, it is understood that each main cutting edge 36 extends over more than half the peripheral length of its associated lateral surface 26.
    [0063] Additionally, in some embodiments of the present invention, each main cutting edge 36 may include a straight portion, which joins with the associated cutting and corner edge 38 at a first end point E1.
    [0064] As shown in Figure 4, each side surface 26 has two main relief surfaces 50, where each main relief surface 50 extends away from the main associated cutting edge 36.
    [0065] It should be recognized that each major relief surface 50, also known as a 'reversed' relief surface, generally extends outward (that is, in a direction away from the insert geometric axis A1) from its edge. main associated cut 36 and towards the median plane M, so that each main cutting edge 36 is beneficially supported and advantageously robust.
    [0066] As illustrated in Figures 2b and 7, a third imaginary straight line L3 extends perpendicular to the median plane M and intersects with any of the main cutting edges 36 at any point along its length, it can pass through the median plane M within the insert boundary line Lb.
    [0067] It should be recognized that the third imaginary straight line L3 appears as a point in an end view of the cutting insert 20, as shown in Figure 2b.
    [0068] As shown in Figure 3b, each smaller cutting edge 40 can tilt away from the cutting edge and mutually associated corner 38 towards the median plane M along the entire length.
    [0069] In some embodiments of the present invention, as illustrated in Figure 3b, each minor cutting edge 40 may intersect with its associated first vertical plane PV1.
    [0070] In addition, in some embodiments of the present invention, the two corner cutting edges 38 associated with each corner surface 28 can be completely located on sides opposite the associated first vertical plane PV1.
    [0071] As illustrated in Figures 8 to 11, the present invention also relates to a cutting tool 52 that is rotatable about a tool axis A2 in a direction of rotation Z, which has a cutting body 54 and at least one of the reversible cutting inserts 20 mentioned above. Each cutting insert 20 is removably secured in an insert receiving bag 56 of the cutting body 54.
    [0072] In some embodiments of the present invention, each cutting insert 20 can be removably secured in an insert receiving pouch 56 by means of a clamping screw 58 that passes through the through hole 30, which engages in a threaded way. a screw hole (not shown) on a support surface (not shown) of the insert receiving bag 56.
    [0073] As shown in Figure 11, each cutting insert 20 can be configured within the cutting tool 52 so that during the rotation of the cutting tool 52 around the geometric axis of tool A2, the operative corner cutting edge 38 inscribes a first contour line in arc shape C1 in a radial plane Pr containing the tool axis A2, where the first contour line C1 has a constant radius of curvature R that subtends a corner cutting angle δ of 90 °.
    [0074] In addition, as shown in Figure 11, each cutting insert 20 can be configured within the cutting tool 52 so that during the rotation of the cutting tool 52 around its geometric tool axis A2, in which the minor cut edges and the main operating edges 36, 40 are inscribed with the third contour line and the second straight contour line C2, C3, respectively, in the radial plane Pr, where the second contour line C2 is substantially parallel to tool axis A2 and the third contour line C3 is substantially perpendicular to tool axis A2.
    [0075] Throughout the description, it should be recognized that the parallelism and perpendicularity of the second and third contour lines C2 and C3, respectively, with respect to the tool axis A2 has an accuracy tolerance of 0.5 °.
    [0076] In some embodiments of the present invention, the rotary cutting tool 52 can be used for milling operations.
    [0077] It should be recognized that during the milling operation, the operating corner cutting edge 38 cuts a corner in a part (not shown) that has a constant radius of curvature R that subtends a corner cutting angle δ of 90 °, which advantageously results in the reduction of stress concentrations in the corner, thereby minimizing the risk of fracture.
    [0078] It should also be recognized that during the milling operation, the main 'reversed' relief surfaces 50 beneficially provide the main non-operative cutting edges 36 of each reversible cutting insert 20 with a large gap from the workpiece , thus, advantageously allowing its arrangement in cutting tools of relatively smaller diameter 52.
    [0079] In some embodiments of the present invention, as can be easily understood from Figure 11, where each cutting insert 20 can be configured within the cutting tool 52, so that the smaller cutting edges, corner and main operations 36, 38, 40 can perform the milling operation with square edge or 90 ° in the workpiece.
    [0080] It should be recognized that during a milling operation with square edge, or 90 °, the height of the machined edge is not limited by the cutting insert 20.
    [0081] In some embodiments of the present invention, as illustrated in Figures 9 and 10, each cutting insert 20 can be configured within the cutting tool 52, so that the main operating cutting edge 36 has a positive axial angle of attack β and the operating minor cutting edge 40 has a positive radial attack angle θ.
    [0082] It should be recognized that by providing the smaller cutting edges and the main operating edges 36, 40 with positive axial and radial angles of attack β and θ, respectively, lower cutting forces are generated, the machine spindle requires less energy operating conditions and the workpiece is subject to a smooth cutting action. In addition, the cutting chips produced are advantageously removed away from the operating cutting edges.
    [0083] Although the present invention has been described with a precise degree of particularity, it is necessary to understand that several changes and modifications can be made without departing from the spirit or scope of the invention hereinafter claimed.
    权利要求:
    Claims (15)
    [0001]
    1. Reversible cutting insert (20) comprising: first and second opposite end surfaces (22) interconnected by means of a continuous peripheral surface (24), with a median plane (M) located between the first and second end surfaces (22) and which intersect with the peripheral surface (24) to form an insert boundary line (Lb), and an insert geometric axis (A1) perpendicular to the median plane (M) around which the cutting insert (20) is removable, the peripheral surface (24) including three side surfaces (26) that alternate with three corner surfaces (28), the side and corner surfaces (26, 28) intersect with both the first and with the second end surfaces (22) at the side and corner edges (32, 34), respectively, with each side edge (32) having a main cutting edge (36), and each corner edge (34) having an edge smaller and corner cut (38, 40), and each corner surface (28) having two smaller relief surfaces (48), each smaller relief surface (48) extending away from its associated minor cutting edge (40), where: each smaller cutting edge (40) has a projected shorter cutting length ( LM) in an end view of the cutting insert (20) along the insert geometric axis (Al), and each minor relief surface (48) has a smaller relief width (W) between two lateral border points of the minor relief surface (48) contained in a horizontal plane (PH) perpendicular to the insert geometric axis (A1), the minor relief width (W) varies with the displacement distance (Do) between the horizontal plane (PH) and the median plane (M), characterized by the fact that: each projected shorter cut length (LM) is greater than the maximum minor relief width (WMAX) of its associated minor relief surface (48), and a first line imaginary line (L1) extends perpendicular to the median plane (M) and intersects with any of the corner cutting edges (38) at any point along its length, and passes through the median plane (M) within the insert boundary line (Lb).
    [0002]
    2. Cutting insert (20), according to claim 1, characterized by the fact that the smaller relief width (W) increases as the displacement distance (Do) increases.
    [0003]
    3. Cutting insert (20), according to claim 1, characterized by the fact that the minor relief width (WMIN) of each minor relief surface (48) occurs at a displacement distance (Do) having a value equal to zero.
    [0004]
    4. Cutting insert (20) according to claim 1, characterized by the fact that each corner cutting edge (38) extends between the first and the second end points (E1, E2), and in which each minor and major cutting edge (36, 40) slopes away from the first and second end points (E1, E2), respectively, from an associated corner cutting edge (38), towards the median plane ( M), preferably where each main cutting edge (36) slopes away from the first end point (E1) towards the median plane (M) along its entire length, more preferably where each side surface ( 26) is divided in half by a second vertical plane (PV2) which contains the insert geometric axis (A1), and where each main cutting edge (36) crosses its associated second vertical plane (PV2).
    [0005]
    5. Cutting insert (20) according to claim 4, characterized by the fact that each smaller cutting edge (40) slopes away from the second end point (E2) towards the median plane (M) along its entire length.
    [0006]
    6. Cutting insert (20) according to claim 1, characterized in that each corner cutting edge (38) has a projected corner cutting length (Lc) in an end view of the cutting insert ( 20) along the geometric axis of insertion (A1), and where the projected shorter cut length (LM) of each smaller cut edge (40) is greater than the projected curve cut length (Lc) of its associated corner cutting edge (38).
    [0007]
    7. Cutting insert (20), according to claim 1, characterized by the fact that the second imaginary straight line (L2) extends perpendicular to the median plane (M) and intersects with any of the smaller cutting edges ( 40) at any point along its length, it passes through the median plane (M) within the insert boundary line (Lb).
    [0008]
    8. Cutting insert (20), according to claim 1, characterized by the fact that a straight line of imaginary relief (LR) is coplanar to the geometric axis of the insert (A1) and tangential to any point at or coinciding with each minor relief surface (48) that converges towards the insert geometric axis (A1) in the same direction as the faces of the associated end surface (22).
    [0009]
    9. Cutting insert (20), according to claim 1, characterized by the fact that a third imaginary straight line (L3) extending perpendicular to the median plane (M) and crossing any of the main cutting edges (36) at any point along the length, it passes through the median plane (M) within the insert boundary line (Lb).
    [0010]
    10. Cutting insert (20) according to claim 1, characterized in that each corner cutting edge (38) is curved and each smaller cutting edge (40) is straight, in an end view of the cutting insert (20) along the insert geometric axis (A1), and / or where each minor relief surface (48) is planar.
    [0011]
    11. Cutting insert (20), according to claim 1, characterized by the fact that the peripheral surface (24) has exactly three side surfaces (26) that alternate with exactly three corner surfaces (28), and in that the cutting insert (20) exhibits triple rotational symmetry around the geometric axis of the insert (A1).
    [0012]
    12. Cutting insert (20), according to claim 1, characterized by the fact that each lateral surface (26) has a median region of planar lateral (46) perpendicular to the median plane (M), in which each surface of corner (28) is divided in half by a first vertical plane (PV1) that contains the insert geometric axis (A1), and in which each median lateral region (46) forms a first acute angle (α1) with the first vertical plane (PV1) of an adjacent corner surface (28), and the first angle (α1) has a value of 30 °, preferably where the two corner cutting edges (38) associated with each corner surface (28) are , each, completely located on opposite sides of the associated first vertical plane (PV1).
    [0013]
    13. Cutting insert (20) according to claim 1, characterized by the fact that the peripheral surface (24) is grounded.
    [0014]
    14. Cutting insert (20) according to claim 1, characterized by the fact that each corner surface (28) has two corner relief surfaces in partial conical shape (44), each corner relief surface ( 44) extending away from its associated corner cutting edge (38).
    [0015]
    15. Cutting tool (52) rotating around a geometric tool axis (A2) characterized by the fact that it comprises: a cutting body (54); and at least one reversible cutting insert (20), as defined in claim 1, removably secured in an insert receiving bag (56) of the cutting body (54), preferably each cutting insert (20) it is configured and seated so that the main agent, the corner and minor cut edges (36, 38, 40) are capable of performing a square edge milling operation in one piece.
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    CA2959774A1|2016-03-31|
    BR112017004438A2|2017-12-05|
    RU2694390C2|2019-07-12|
    CN106715014B|2019-03-08|
    WO2016046811A1|2016-03-31|
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    法律状态:
    2020-02-18| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-02-09| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-03-02| 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 11/08/2015, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US14/492,761|2014-09-22|
    US14/492,761|US9468983B2|2014-09-22|2014-09-22|Rotary cutting tool and reversible cutting insert having variable-width minor relief surfaces therefor|
    PCT/IL2015/050818|WO2016046811A1|2014-09-22|2015-08-11|Rotary cutting tool and reversible cutting insert having variable-width minor relief surfaces therefor|
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