• 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:
    PURPOSE: A cutter body with cutting inserts and method for assembling the same is provided to improve the stability of the cutting insert and enable a fastening screw to be more accessible to a screwdriver. CONSTITUTION: A cutting assembly comprises: a tool holder having an insert seat, the insert seat including a seat surface into which a screw-threaded mounting hole extends in a direction obliquely to a plane of the seat surface; a cutting insert(26) mounted in the seat, the insert having a front surface and a rear supporting surface oriented parallel to the seat surface, the insert having a through-hole(29) defining a center axis and including a front cavity(50) disposed at the front surface of the insert, the front cavity defined by a wall, at least a screw-supporting portion of the wall having a circular cross section which tapers toward the rear supporting surface; and a fastening screw extending through the through-hole, the screw including a threaded shank, and an enlarged head disposed in the cavity, the head including an outer face configured as part of a sphere which makes 360 degree contact with the screw-supporting portion of the cavity wall, the threaded shank threadedly mounted in the mounting hole, the head and shank being shaped symmetrically about the center axis of the screw, a maximum cross section of the head being larger than a maximum cross section of the through-hole, the center axis of the screw forming an acute angle with the center axis of the through-hole.
    公开号:KR20020028817A
    申请号:KR1020010062304
    申请日:2001-10-10
    公开日:2002-04-17
    发明作者:시라이와아키오
    申请人:레나르트 태퀴스트；산드빅 악티에볼라그；
    IPC主号:
    专利说明:

    Cutter body with cutting insert and assembly method therefor {CUTTER BODY WITH CUTTING INSERTS AND METHODS FOR ASSEMBLING SAME}
    [9] The present invention relates to a cutting insert, a method for assembling the cutting insert to a cutter body and the assembled cutter body.
    [10] 1 and 2 are conventional milling cutters comprising a rotatable holder body 1 having a plurality of insert seats circumferentially spaced apart. The insert seat is equipped with an indexable cutting insert 3 with an optional shim 4. The insert 3 and shim (if provided) are held in place by fastening screws 5 extending through the holes formed in the insert and shim. The tightening screw is screwed into the screw hole 6 which is formed to extend perpendicular to the respective support surface 7. Such milling cutters are disclosed, for example, in US Pat. No. 5,871,309.
    [11] In order to tighten the screw, it is necessary to insert the rotary tool into the cavity formed in the screw head. From FIG. 2, it can be understood that the central axis A of the screw almost intersects the radially outer edge 10 of the face 12 of the pocket 14 formed in front of each insert seat 2. This obstructs the insertion of the rotary tool, so that a special rotary tool with a long shank is used to avoid interference of the handle 10 and the edge 10 of the tool.
    [12] Thus, the insert is pushed back simultaneously with respect to the support surface and transversely with respect to the abutment surface, while at the same time providing a fastening screw which is not only easily accessible but also makes 360 ° contact with the wall of the through-hole of the insert. It is desirable to provide a cutting insert mounting form provided.
    [13] Furthermore, it is desirable to secure the cutting inserts as closely as possible to each sheet so that there is no vibration or chatter on the inserts. Conventional seats have upright butt surfaces as well as rear support surfaces with screw-receiving holes. By pressing the insert against both the rear support surface and the mating surface, the insert becomes more stable and less likely to have vibration or chatter. To date, various ways of pressing the insert with the fastening screw have been proposed. For example, as disclosed in US Pat. No. 6,053,671, a tightening screw is inserted into a screw hole extending vertically into the support surface, but may be positioned in relation to the butting surface, so that a portion of the head of the screw The insert will be pushed not only rearward with respect to this supporting surface but also laterally with respect to the butting surface.
    [14] Another technique disclosed in US Pat. No. 3,662,444 includes screw holes oriented non-perpendicular to the support surface. If so, when the tightening screw is inserted into the screw hole through the center through-hole of the insert, the conical surface on the screw head will incline the insert laterally relative to the support surface and laterally relative to the butting surface.
    [15] A disadvantage associated with the shapes described in US Pat. Nos. 6,053,671 and 3,662,444 is that the screw head contacts less than 360 ° with the wall of the through-hole of the insert, thereby limiting the stability of the insert obtainable.
    [16] U. S. Patent No. 5,199, 828 discloses a mounting form for turning inserts in which the insert can be replaced without removing the tightening screw. For this purpose, the central hole formed in the insert has a larger maximum cross section than the head of the screw. By inclining the axis of the screw with respect to the axis of the central hole so that the screw head can securely hold the insert in place, the screw enters an oblique angle to the rear support surface, which essentially aligns the insert by the screw head. This results in a push against the face. The screw head is in contact with the wall of the central hole in two places opposite in the radial direction, ie the contact between the screw head and the insert is discontinuous, so that the insert stability is not maximized.
    [17] It is an object of the present invention to provide a cutting assembly, a method of mounting a cutting insert on a tool holder of the assembly and the insert itself.
    [1] 1 is a perspective view of a milling cutter of the prior art;
    [2] FIG. 2 is a schematic end view of a portion of the milling cutter shown in FIG. 1;
    [3] 3 shows the invention similar to FIG. 2;
    [4] 4 is a front view of the cutting insert mounted to the milling cutter of FIG. 3;
    [5] FIG. 5 is a side elevation view taken in the direction of arrow T of FIG. 3; FIG.
    [6] 6 is a longitudinal sectional view taken through a cutting insert according to the invention;
    [7] 7 is a side elevation view of a tightening screw used in the present invention;
    [8] 8 is a cross-sectional view of the cavity of the insert through the insert having an alternative shape;
    [18] The cutting assembly comprises a tool holder with an insert sheet. The insert seat includes a seat surface in which threaded mounting holes extend in a direction oblique to the plane of the seat surface. A cutting insert is mounted on the sheet. The insert has a front and rear support surface oriented parallel to the seat surface. The insert has a through-hole defining a central axis and comprising a front cavity disposed on the front of the insert. The front cavity is formed by a wall, at least its screw-supporting portion having a circular cross section and tapering towards the rear supporting surface. The tightening screw extends through the through-hole and includes a threaded shank and an extended head disposed in the cavity. The head comprises an outer surface which is configured as part of the sphere and makes 360 ° contact with the screw-supporting surface of the cavity wall. Threaded shanks are threaded into the mounting holes. The head and shank are symmetrical with respect to the central axis of the screw. The central axis of the screw forms an acute angle with the central axis of the through-hole.
    [19] The insert sheet preferably includes an abutment surface extending outwardly from the seat surface and a screw-mounting hole oriented such that the screw exerts a force with the component force directed toward the abutment surface on the insert.
    [20] The central axis of the screw preferably extends forward from the screw in the rotational direction, and deviates from the central axis of the through-hole in a direction away from the rotational axis.
    [21] The invention also relates to a method of mounting the cutting insert to the insert seat.
    [22] The invention also relates to the cutting insert itself.
    [23] The objects and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments in conjunction with the accompanying drawings in which like reference numerals designate like elements.
    [24] 3 to 5 show a rotatable tool 20 in the form of a milling cutter. The tool comprises a holder body 22 having a plurality of insert sheets 24 spaced circumferentially. Each seat 24 includes a rear support surface 32 and an upstanding butt surface 33 composed of segments 33A and 33B (see FIG. 4) that are angled to each other. At least most insert seats are equipped with indexable cutting inserts 26 with optional shims (not shown in the figure). Each insert 26 is indexable in that it includes a plurality of selectively deployable cutting edges. Insert 26 (and shim (if provided)) is secured in place by a tightening screw 28 extending through a central through-hole 29 formed in the insert 26 (and shim (if provided)). . The tightening screw 28 is screwed to the screw mounting hole 30 formed in the support surface 32 of the seat 24.
    [25] The holes 30 extend not perpendicular to each face 32. That is, as shown in FIG. 3, the holes 30 are along each axis L which is inclined obliquely with respect to the line N perpendicular to the seat surface 32 (the axis L is a normal line). (N) and an acute angle (α). The angle α is deviated from the normal N in the direction away from the center of the tool (because it extends forwardly from the screw 28 in the direction of rotation R), and thus considerably above the prior art. It is arranged to be spaced apart from the outer end 10 of the face 36 of the pocket 38 formed in the front of each insert slot by a large distance D. The prior art screws 5, which are oriented perpendicular to the face 32 along the normal line N, are shown in broken lines in FIG. 3 for comparison. Thus, it will be appreciated that the screw 28 is more accessible than the prior art, so that it is easier to insert and remove using rotary tools of more various sizes.
    [26] Furthermore, this advantage is achieved without changing the orientation of the through-holes 29 formed in the cutting insert, ie without obliquely tilting the central axis L 'of the hole with respect to the front face 40 of the insert. Rather, the through-hole 29 is symmetric about a line perpendicular to the front face 40, as in the prior art. The symmetrical configuration is made possible by providing the through-holes 29 with front and rear cavities 50, 52 that extend at the front 40 and rear support surfaces 41 (see FIG. 6) of the insert.
    [27] The front cavity 50 is formed by a wall, at least a portion of which is such that the screw axis A does not coincide with the axis L of the hole 30, that is, the axis A is angled with the axis L. Support the head of the screw in such a way that the screw can be oriented to achieve this. Thus, the head-supporting portion of the front cavity 50 should have a circular cross section tapering (narrowing) towards the rear cavity 52. For example, the head-supporting portion may be spherical as shown in FIGS. 3, 5 and 6 or conical as shown at 50 'in FIG. As used hereinafter, the expression "conical surface" includes a surface comprising a portion of a complete cone (ie, frusto-conical), and similarly "spherical surface". Includes a surface comprising a portion of a complete sphere.
    [28] The screw 28 has a head 56 and a threaded shank 58 extending outwardly from the head. The head has a maximum cross section larger than the through-hole 29 and the screw is required to be completely removed from the mounting hole 30 in order to exchange the cutting insert. The screw is symmetrical with respect to the central axis A in the longitudinal direction of the screw. The head includes an outer surface of a shape suitable for contacting the head-support of the front cavity 50. If the head-support is conical, the head will be in line-to-line contact with it. If the head-support is spherical with a radius equal to the radius of the spherical surface of the head 56, there will be a face-to-face contact, but if the radius is different, a line-to-line contact will occur. The line-to-line (or face-to-face) contact is conical (symmetrical) with respect to the axis of the screw and will occur 360 ° around the axis. Therefore, the force exerted by the insert by the screw will have a more stable effect.
    [29] Note that the entire outer surface of the screw need not be spherical, but still only a portion of it must be in contact with the surface of the cavity 50 by 360 °.
    [30] The direction of the screw hole 30 is such that the force exerted by the insert from the screw includes the transverse component component (s) directed towards the butt surfaces 33A and 33B. Thus, for example, as can be seen in FIG. 4, the inserted screw exerts a force F on the insert in a direction such that it has a component force F1, F2 directed towards each segment 33A, 33B of the butting surface. Oriented to impose. This combination of forces, together with the 360 ° contact between the screw head and the through-hole wall of the insert, will have a highly stabilized effect of preventing the insert's vibration and chatter. This form of the invention is useful whether or not access to the screw head is easy, as in the case of the milling cutter described above. In other words, this improved form of stability can be used for all inserts using tightening screws in a rotary or stationary holder.
    [31] It will be appreciated that the butting surface may generally comprise one segment. The butting surface may be curved instead of consisting of flat segments.
    [32] The rear cavity 52 of the insert has a gradually increasing cross section towards the support surface 41 to accommodate the inclination of the screw 28 with respect to the insert axis A '. Preferably, the shape of the rear cavity is conical.
    [33] The hole 6 can be oriented such that the angle α is in a plane oriented perpendicular to the axis of rotation of the tool 20, where both the screw axis A and the center axis A 'of the insert are Lies in the plane. Alternatively, however, as shown in FIG. 5, the axes A, A 'lie in a plane oriented obliquely to the axis of rotation, ie the direction T in which the tool is perpendicular to the axis of rotation. As can be seen, it is possible to form the hole such that the axis A is inclined by an acute angle β with respect to the axis A '. Regardless of whether both axes A, A 'lie in a plane oriented perpendicularly or obliquely to the axis of rotation, the insert and screw are shown in FIG. 3 when viewed in a direction parallel to the axis of rotation. As shown, that is, the axes L, A are off with respect to the axis A 'to form a distance D. The angle β (if present) is, as it extends forward from the head of the screw, away from the axis A 'in a direction parallel to the axis of rotation, as shown in FIG. Will be oriented toward the cutting edge 26A.
    [34] It will be appreciated that the present invention can provide a more stable cutting insert and make the tightening screw more accessible to the screwdriver.
    [35] Although the insert has shown that its rear support surface 41 is in direct contact with the seat surface 32, a shim similar to the shim 4 of FIG. 1 may instead be provided between the faces.
    [36] The insert can be of any desired shape, such as polygon or circle.
    [37] While the present invention has been described in connection with the preferred embodiments, it will be apparent to those skilled in the art that additions, deletions, modifications and substitutions, etc., which are not clearly described without departing from the spirit and scope of the invention as defined in the appended claims. I will understand that this is possible.
    [38] According to the present invention, it is possible to provide a more stable cutting insert and to make the tightening screw more accessible to the screwdriver.
    权利要求:
    Claims (22)
    [1" claim-type="Currently amended] As a cutting assembly,
    A tool holder having an insert seat having a threaded mounting hole therein, the seat surface including a seat surface extending in an oblique direction with respect to the plane of the seat surface;
    A through-hole mounted to the seat, having a front and rear support surface oriented parallel to the seat surface, the through-hole including a front cavity disposed on the front face of the insert to form a central axis; A cutting insert formed by a wall and having at least a screw-supporting portion of the wall tapering towards the rear support surface; And
    A threaded shank and an extended head disposed within the cavity, extending through the through-hole, wherein the head is configured as part of a sphere and has an outer surface that makes 360 ° contact with the screw-support of the cavity wall. Wherein the threaded shank is screwed into the mounting hole, the head and shank are shaped symmetrically about the central axis of the screw, the maximum cross section of the head being greater than the maximum cross section of the through-hole. Wherein the central axis of the screw comprises a tightening screw that forms an acute angle with the central axis of the through-hole.
    [2" claim-type="Currently amended] The method of claim 1,
    And the 360 ° contact is coaxial with the screw-support of the cavity wall.
    [3" claim-type="Currently amended] The method of claim 1,
    And the seat further comprises an abutment surface extending outwardly from the seat surface and a mounting hole oriented such that the screw is forced by the insert with the component force directed towards the abutment surface.
    [4" claim-type="Currently amended] The method of claim 3, wherein
    Said abutment surface comprises two segments angled with respect to each other, said force having a component force directed towards each segment.
    [5" claim-type="Currently amended] The method of claim 1,
    And the tool holder forms a rotation axis, and the front surface of the insert faces forward in the rotational direction of the tool holder.
    [6" claim-type="Currently amended] The method of claim 5,
    And the central axis of the screw extends forwardly from the screw in the rotational direction and away from the central axis of the through-hole in a direction away from the rotational axis.
    [7" claim-type="Currently amended] The method of claim 6,
    And the center axis of the screw extends forwardly from the screw in the direction of rotation, and deviates from the center axis of the through-hole in a further direction parallel to the axis of rotation.
    [8" claim-type="Currently amended] The method of claim 7, wherein
    Said further direction is also towards the actual cutting edge of said insert.
    [9" claim-type="Currently amended] The method of claim 1,
    The through-hole further comprising a rear cavity disposed in the rear support surface, the cross section of the rear cavity extending in a direction away from the front cavity.
    [10" claim-type="Currently amended] The method of claim 9,
    And the rear cavity is conical.
    [11" claim-type="Currently amended] The method of claim 1,
    The rear support surface of the insert is in direct contact with the seat surface.
    [12" claim-type="Currently amended] The method of claim 1,
    And the thread-supporting portion of the cavity wall is spherical.
    [13" claim-type="Currently amended] The method of claim 1,
    And said screw-supporting portion of said cavity wall is conical.
    [14" claim-type="Currently amended] The method of claim 1,
    And the cutting insert comprises an indexable insert having a plurality of selectively disposable cutting edges.
    [15" claim-type="Currently amended] The method of claim 2,
    The tool holder includes a rotatable main body defining a rotation axis, the plurality of insert sheets formed on the outer circumference of the main body and spaced apart in the circumferential direction with respect to the rotation axis, and the plurality of cutting inserts mounted on the respective insert sheets. Wherein the seat surface of each insert sheet generally faces forward in the direction of rotation of the body, each insert sheet comprising a wall structure in which adjacent insert sheets are separated from each other, the wall structure each insert sheet with respect to the direction of rotation Extending toward the outer circumference of the body with respect to the position in front of the, wherein the central axis of the screw extends forward from the insert and deviates from the central axis of each through-hole in a direction away from the rotation axis Cutting assembly.
    [16" claim-type="Currently amended] As a method of mounting the cutting insert on the insert seat of the tool holder,
    The insert seat includes a seat surface in which a threaded mounting hole extends in a direction oblique to the plane of the seat surface, wherein the cutting insert has a rear support surface and a through-hole extending completely through the insert. Wherein the through-hole comprises a front cavity disposed on the front side of the insert opposite the rear support surface, the front cavity formed by a wall, at least the screw-supporting portion of the wall tapering towards the rear support surface. Has a circular cross section,
    A. Tightening screw comprising a threaded shank and an extended head, and an outer surface consisting of a portion of the sphere contacting the screw-support of the cavity wall and having a maximum cross section greater than the through-hole of the insert. Providing a head and a threaded shank forming a central axis with which the screw has a symmetrical shape;
    B. positioning the insert on the insert sheet having a rear support surface oriented parallel to the seat surface;
    C. inserting a screw through the through-hole and engaging the shank into the mounting hole, wherein the extended head has its outer surface in 360 ° contact with the screw-supporting wall portion of the cavity. And the central axis of the screw extends forwardly from the screw to form an acute angle with the central axis of the through-hole.
    [17" claim-type="Currently amended] The method of claim 16,
    And said 360 ° contact is coaxial with respect to the central axis of the screw following the engagement of the shank in step C.
    [18" claim-type="Currently amended] The method of claim 16,
    The tool holder includes a rotatable main body defining a rotation axis, the plurality of insert sheets formed on the outer circumference of the main body and spaced apart in the circumferential direction with respect to the rotation axis, and the plurality of cutting inserts mounted on the respective insert sheets. Wherein the seat surface of each insert sheet generally faces forward in the direction of rotation of the body, each insert sheet comprising a wall structure in which adjacent insert sheets are separated from each other, the wall structure each insert sheet with respect to the direction of rotation Extending toward the outer periphery of the body with respect to the position in front of the, wherein the central axis of the screw extends forward from the insert, each in a direction away from the axis of rotation following the engagement of the shank in step C. Deviating from the central axis of the through-hole.
    [19" claim-type="Currently amended] An indexable cutting insert comprising a body having a front side and a rear side and a through-hole extending therethrough, the indexable cutting insert comprising:
    The front face includes a cutting edge structure, the back face forms a support surface, the through-hole includes front and rear cavities facing towards the front and back surfaces, and the front cavity tapered toward the support surface. And the rear cavity has an enlarged cross section toward the support surface.
    [20" claim-type="Currently amended] The method of claim 19,
    And the rear cavity is conical.
    [21" claim-type="Currently amended] The method of claim 19,
    And the front cavity is spherical.
    [22" claim-type="Currently amended] The method of claim 19,
    And the front cavity is conical.
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    同族专利:
    公开号 | 公开日
    PL350063A1|2002-04-22|
    PL196677B1|2008-01-31|
    US6579042B1|2003-06-17|
    KR100855072B1|2008-08-29|
    DE60128767D1|2007-07-19|
    CN1213829C|2005-08-10|
    AT363956T|2007-06-15|
    JP2002160117A|2002-06-04|
    EP1197281B1|2007-06-06|
    CN1368416A|2002-09-11|
    EP1197281A1|2002-04-17|
    DE60128767T2|2008-01-31|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2000-10-11|Priority to US09/685,876
    2000-10-11|Priority to US09/685,876
    2001-10-10|Application filed by 레나르트 태퀴스트, 산드빅 악티에볼라그
    2002-04-17|Publication of KR20020028817A
    2008-03-05|First worldwide family litigation filed
    2008-08-29|Application granted
    2008-08-29|Publication of KR100855072B1
    优先权:
    申请号 | 申请日 | 专利标题
    US09/685,876|US6579042B1|2000-10-11|2000-10-11|Cutter body with cutting inserts and methods for assembling same|
    US09/685,876|2000-10-11|
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