WO2013125542A1 - 切削インサートおよび刃先交換式切削工具 - Google Patents
切削インサートおよび刃先交換式切削工具 Download PDFInfo
- Publication number
- WO2013125542A1 WO2013125542A1 PCT/JP2013/054053 JP2013054053W WO2013125542A1 WO 2013125542 A1 WO2013125542 A1 WO 2013125542A1 JP 2013054053 W JP2013054053 W JP 2013054053W WO 2013125542 A1 WO2013125542 A1 WO 2013125542A1
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- WO
- WIPO (PCT)
- Prior art keywords
- cutting edge
- cutting
- corner
- face
- insert
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/16—Milling-cutters characterised by physical features other than shape
- B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/02—Milling-cutters characterised by the shape of the cutter
- B23C5/08—Disc-type cutters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
- B23B27/1659—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped with plate-like exchangeable cutting inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/16—Milling-cutters characterised by physical features other than shape
- B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
- B23C5/202—Plate-like cutting inserts with special form
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/04—Overall shape
- B23B2200/049—Triangular
- B23B2200/0495—Triangular rounded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/04—Overall shape
- B23C2200/0405—Hexagonal
- B23C2200/0411—Hexagonal irregular
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/04—Overall shape
- B23C2200/0477—Triangular
- B23C2200/0483—Triangular rounded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/08—Rake or top surfaces
- B23C2200/085—Rake or top surfaces discontinuous
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/12—Side or flank surfaces
- B23C2200/125—Side or flank surfaces discontinuous
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/20—Top or side views of the cutting edge
- B23C2200/208—Wiper, i.e. an auxiliary cutting edge to improve surface finish
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T407/00—Cutters, for shaping
- Y10T407/19—Rotary cutting tool
- Y10T407/1906—Rotary cutting tool including holder [i.e., head] having seat for inserted tool
- Y10T407/1942—Peripherally spaced tools
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T407/00—Cutters, for shaping
- Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
Definitions
- the present invention relates to a cutting insert and a cutting edge exchangeable cutting tool to which the cutting insert is attached.
- the present invention relates to a cutting insert used for grooving (slot processing) and a blade-tip-exchange-type rotary cutting tool to which the cutting insert is attached.
- a blade cutter replaceable side cutter As one of rotary cutting tools capable of performing grooving, there is a blade cutter replaceable side cutter.
- a blade cutter type side cutter a plurality of cutting inserts are usually arranged in a staggered manner on the outer peripheral portion of the side cutter body.
- the rotation trajectory of the cutting edge for machining the groove bottom of the cutting insert attached with respect to one end face of the side cutter body and the groove bottom machining of the cutting insert attached with respect to the other end face of the side cutter main body The amount of overlap with the rotation trajectory of the cutting edge is set to be a predetermined amount.
- Patent Document 1 discloses a side cutter in which a plurality of cutting inserts are arranged in a staggered manner.
- the upper and lower surfaces each have a parallelogram shape.
- Patent document 2 discloses the cutting insert for milling.
- This cutting insert has a substantially hexagonal shape in a plan view and is a negative type cutting insert.
- Three cutting inserts are formed at the respective edges of the upper surface and the lower surface opposite to each other along the corners. It has a cutting edge part, and it is comprised so that six corners can be used for cutting on the upper and lower surfaces.
- the lengths of the sides of the upper and lower surfaces are all substantially the same, and the length of each side is about half the width of the cutting insert.
- two sides having the same length extend from one corner having a corner inner angle of 90 ° in different directions, and the main cutting in a single cutting edge on these sides.
- a blade and a sub-cutting blade are formed respectively.
- Patent Document 3 discloses a cutting insert having a substantially hexagonal upper surface used for an end mill.
- the upper surface of the cutting insert has a rotationally symmetric shape around the axis, and has long side portions and short side portions that are alternately arranged.
- the cutting edge of this cutting insert is formed only at the edge portion of the upper surface, and includes a side blade formed on the long side portion and a bottom blade formed on the short side portion.
- the width in the direction intersecting with the cutting edge of the chip breaker is gradually increased from the tip of the cutting edge to the rear end, and the chip breaker The depth is gradually increased.
- a side cutter it is desirable to be able to machine grooves of various widths using a plurality of cutting inserts of the same type.
- a plurality of cutting inserts are arranged in a staggered manner in a tool body so that the rotation trajectories of cutting edges for groove bottom machining overlap each other.
- the width of the blade part of such a side cutter does not depend only on the width of a plurality of cutting edges for groove bottom processing, but the cutting edge for groove bottom processing is arranged substantially parallel to the rotation axis of the side cutter body. It also depends on the overall width of the cutting insert.
- This invention aims at providing the cutting insert created in view of the above situation, and the cutting tool with which it is mounted
- the present invention has a cutting insert that has a large number of corners that can be used for cutting, has excellent ability to process grooves of various widths, and has excellent controllability in the direction of chip discharge, and is equipped with the cutting insert. It is a further object to provide a rotary cutting tool that can be used as a side cutter.
- a peripheral side surface extending between the first end surface and the second end surface;
- At least three first cutting edges formed at intersecting ridges between the first end face and the peripheral side, each extending along an associated enhanced corner;
- a main cutting edge extending from one end of the corner cutting edge to the next lowered corner, and from the other end of the corner cutting edge to the other lowered corner A distance between the raised corner and the one lowered corner between which the main cutting edge extends, the intermediate cutting edge extending between Longer than the distance between the raised corner and the other lowered corner, the main cutting edge has an inclined portion that approaches the midplane as it moves away from the corner cutting edge, Inclined portion where the cutting edge approaches the center plane as it moves away from the corner cutting edge A, a first cutting edge portion, At least three second cutting edges formed at intersecting ridges between the second end face and the peripheral side, each extending along an associated enhanced corner;
- a main cutting edge
- each of the first cutting edge portion and the second cutting edge portion an enhanced corner with one main cutting edge extending therebetween and one lowered corner Is longer than the distance between the raised corner and the other lowered corner between which the secondary cutting edge extends, with the main cutting edge moving toward the center plane as it moves away from the corner cutting edge.
- the secondary cutting edge has an inclined portion that approaches the central plane as it moves away from the corner cutting edge. Therefore, this cutting insert can be used for machining grooves having various widths as a side-cutting cutting insert, and can contribute to suitably discharging chips.
- this cutting insert has at least three first cutting edge portions and at least three second cutting edge portions, it has at least six cutting edge portions.
- the corner cutting edge is formed substantially parallel to the central plane, and in each second cutting edge portion, the corner cutting edge is formed substantially parallel to the central plane.
- the distance between the first cutting edge and the central plane is the shortest at the portion of the first cutting edge away from the adjacent lowered corner in the main cutting edge
- the second The distance between the cutting edge and the central plane is the shortest in the portion of the second cutting edge that is away from the adjacent lowered corner in the main cutting edge.
- the main cutting edge of the first cutting edge portion protrudes outward from the cutting insert at the portion of the main cutting edge away from the adjacent lowered corner.
- the main cutting edge of the second cutting edge portion is located on the outer side of the cutting insert at the portion of the main cutting edge away from the adjacent lowered corner. It is good to be formed so as to protrude.
- the primary cutting edge of the first cutting edge is connected to the secondary cutting edge of the adjacent first cutting edge with the lowered corner, and the main cutting edge of the second cutting edge is adjacent to the adjacent cutting edge.
- the distance between the first cutting edge and the central plane is the main cutting edge side end of the first cutting edge.
- the distance between the second cutting edge and the central plane may be the shortest at the main cutting edge side end of the second cutting edge.
- the interior angle of the raised corner of the first end face is an obtuse angle
- a countersink is formed on the secondary cutting edge of the first cutting edge
- the raised corner of the second end face Is an obtuse angle
- a wiping blade is formed on the sub cutting edge of the second cutting edge portion.
- the first end face includes at least one outer end face portion formed to function as a rake face of the first cutting edge portion adjacent to the first cutting edge portion each associated with the first end face portion; And an inner end surface portion that is located closer to the center plane than the outer end surface portion, and the second end surface is adjacent to the associated second cutting edge portion. And at least one outer end surface portion formed so as to function as a rake face of the second cutting edge portion, and located closer to the inner plane than the outer end surface portion and closer to the central plane than the outer end surface portion. And an inner end face portion formed.
- the outer end surface portion is formed as a single plane or a single curved surface, and at least a majority of the first cutting edge portion adjacent to the smooth extension surface of the outer end surface portion extends, and the second end surface portion extends.
- the outer end face part may be formed as a single plane or a single curved surface, and at least a majority of the second cutting edge part adjacent to the smooth extension surface of the outer end face part may extend.
- the peripheral side surface includes a first side surface portion connected to the first end surface via an associated first cutting edge portion, and a second side surface connected to the second end surface via an associated second cutting edge portion.
- the first side surface portion and the second side surface portion each have a portion inclined toward the outer side of the cutting insert toward the central plane.
- the first side portion is formed adjacent to the main cutting edge and the corner cutting edge of the associated first cutting edge, and the second side portion is the main cutting edge of the associated second cutting edge.
- the second cutting edge portion which is formed adjacent to the corner cutting edge and which is substantially plane-symmetric with the first cutting edge portion with respect to the central plane, and the secondary cutting edge of the first cutting edge portion It is preferable that the peripheral side surface portion between the sub cutting edge and the sub cutting edge is formed in a single plane.
- a tool body having a first tool body end face and a second tool body end face opposite to each other, and an outer peripheral surface between the first tool body end face and the second tool body end face;
- a rotary cutting tool in which a plurality of cutting inserts are detachably attached to At least one first insert mounting seat open to the end face of the first tool body, to which a cutting insert as described above is mounted to use the first cutting edge;
- a cutting insert as described above comprising at least one second insert mounting seat open to the end face of the second tool body, the cutting insert being mounted to use the second cutting edge.
- FIG. 1 is a perspective view of a cutting insert according to the first embodiment of the present invention.
- FIG. 2 is a plan view of the cutting insert according to the first embodiment of the present invention.
- FIG. 3 is a side view of the cutting insert according to the first embodiment of the present invention.
- 4 is a cross-sectional view taken along line IV-IV of the cutting insert of FIG.
- FIG. 5 is a perspective view of the cutting tool according to the first embodiment of the present invention to which the cutting insert of FIG. 1 is attached.
- FIG. 6 is a plan view of the cutting tool of FIG.
- FIG. 7 is a partially enlarged view of the VII part of the cutting tool of FIG.
- FIG. 8 is a cross-sectional view taken along line VIII-VIII of the cutting tool of FIG.
- FIG. 9 is a plan view of a cutting insert according to the second embodiment of the present invention.
- FIG. 10 is a perspective view of a cutting insert according to the third embodiment of the present invention.
- FIG. 11 is a plan view of a cutting insert according to the third embodiment of the present invention.
- FIG. 12 is a side view of a cutting insert according to the third embodiment of the present invention. 13 is a partially enlarged view of the XIII portion of the cutting insert of FIG.
- FIG. 14 is a perspective view of a cutting insert according to the fourth embodiment of the present invention.
- FIG. 15 is a plan view of a cutting insert according to the fourth embodiment of the present invention.
- FIG. 16 is a side view of a cutting insert according to the fourth embodiment of the present invention.
- FIG. 17 is a perspective view of a cutting insert according to the fifth embodiment of the present invention.
- FIG. 18 is a plan view of a cutting insert according to the fifth embodiment of the present invention.
- FIG. 19 is a side view of a cutting insert according to the fifth embodiment of the present invention.
- FIG. 20 is a perspective view of a cutting tool according to the fifth embodiment of the present invention to which the cutting insert of FIG. 17 is attached.
- FIGS. 1 to 4 A first embodiment according to the present invention will be described.
- the cutting insert 1 of the first embodiment is shown in FIGS. 1 to 4, and the cutting tool 8 of the first embodiment with a plurality of cutting inserts 1 detachably attached is shown in FIGS.
- the cutting tool 8 is a so-called side cutter, and the cutting insert 1 is a cutting insert for a side cutter.
- the cutting insert 1 may be used as a cutting insert for other cutting tools.
- FIG. 1 shows a perspective view of the cutting insert 1.
- the cutting insert 1 comprises two end faces 2, 3 that are opposite to each other, that is, opposite to each other, and a peripheral side surface 4 that extends between them, that is, connects them.
- one end face 2 of the two end faces 2 and 3 corresponds to the first end face of the present invention
- the other end face 3 of them corresponds to the second end face of the present invention. May be reversed.
- the upper surface 2 one of the two end faces facing upward in FIGS. 1 and 2
- the other of them is referred to as the lower surface 3. Can be called.
- the terms “upper” and “lower” can be used in the description of directions and other components. However, the terms “upper” and “lower” can also be used in reverse, and of course are not intended to limit the invention.
- the upper surface 2 of the cutting insert 1 of the first embodiment is substantially six in plan view. It has a square outer shape or outline.
- the lower surface 3 has a substantially hexagonal outline in plan view.
- the upper surface 2 and the peripheral side surface 4 intersect at a substantially right angle, and similarly, the lower surface 3 and the peripheral side surface 4 intersect at a substantially right angle. Therefore, the cutting insert 1 of the first embodiment is a so-called negative type cutting insert.
- the cutting insert 1 is provided with a mounting hole 5 that vertically penetrates the cutting insert 1 so as to open at the approximate center of each of the upper surface 2 and the lower surface 3.
- the cutting insert 1 according to the first embodiment employs the mounting hole 5 penetrating the upper and lower surfaces as a structure for clamping the cutting insert 1.
- the mounting hole 5 is not formed and a non-penetrating dimple clamp structure is used. May be adopted.
- the upper surface 2 and the lower surface 3 are formed so as to have a substantially rotationally symmetric shape around an axis A defined so as to extend through the upper surface 2 and the lower surface 3 of the cutting insert 1.
- the cutting insert 1 has a rotational symmetry of 120 ° around the axis A (three-fold rotational symmetry) (see FIG. 2).
- the upper surface 2 and the lower surface 3 each have a substantially rotationally symmetric profile about the axis A.
- the mounting hole 5 and the upper and lower surfaces 2 and 3 are formed so that the axis A coincides with the central axis of the mounting hole 5.
- a plane that is orthogonal to the axis A and bisects the cutting insert 1 is defined, and this plane is referred to as a central plane M.
- the upper surface 2 and the lower surface 3 of the cutting insert 1 have a shape that is substantially symmetrical with each other.
- the cutting insert 1 is formed to have a substantially plane-symmetrical relationship with respect to the central plane M.
- the upper surface 2 and the lower surface 3 have contours that are substantially plane-symmetric with respect to the central plane M.
- the cutting insert 1 of the first embodiment is a double-sided cutting insert, a right-handed cutting edge and a left It is a cutting insert that has a free-cutting edge and can be indexed.
- one series of cutting edges may be referred to as a cutting edge portion.
- the right-handed cutting edge is the cutting edge on the right side when the cutting edge is viewed from the direction of the cutting edge in the cutting insert 1 or the cutting tool 8 on which the cutting insert 1 is mounted. It is the same.
- the upper surface 2 has a substantially hexagonal outline in plan view as described above. Accordingly, there are six corners and six sides at the edge of the upper surface 2, that is, the intersecting ridge line portion (intersection) between the upper surface 2 and the peripheral side surface 4.
- the first corner 21 and the second corner 22 are alternately positioned on the edge of the upper surface 2.
- the upper surface 2 has a contour in which the first side portion 23 and the second side portion 24 are alternately connected with the first corner 21 or the second corner 22 interposed therebetween. Note that there are three first sides 23 and three second sides 24 at the edge of the upper surface 2.
- the first corner 21 can be referred to as an elevated corner, while the second corner 22 is a lowered corner. May be referred to.
- the first corner 21 and the second corner 22 have different angles, and the inner angle of the first corner 21, that is, the first corner inner angle ⁇ is smaller than the inner angle of the second corner 22, that is, the second corner inner angle ⁇ .
- the relationship between the internal angles of the corners 21 and 22 can be determined in a plan view, that is, an end view (see FIG. 2) of the cutting insert 1.
- the internal angle of the second corner 22 is an obtuse angle.
- the internal angle ⁇ of the first corner 21 is an acute angle here, but may be 90 ° or an obtuse angle.
- the internal angles of the three first corners 21 are all the same, and the internal angles of the three second corners 22 are also the same.
- the first side 23 and the second side 24 are different in length, and the second side 24 is shorter than the first side 23. Accordingly, the first side 23 can be referred to as a long side, and the second side 24 can be referred to as a short side.
- the relationship between the lengths of the side portions 23 and 24 can be determined in a plan view, that is, an end view of the cutting insert 1.
- the upper surface 2 substantially has a substantially unequal hexagonal shape composed of a first side 23 as three long sides and a second side 24 as three short sides as an outline. is doing.
- the three first side portions 23 have the same length, and the three second side portions 24 have the same length. These side portions 23 and 24 are connected via either one of the corners 21 and 22, and the first and second corners 21 and 22 constitute connection portions of the adjacent first and second side portions 23 and 24, respectively. To do.
- the first side portion 23 as the long side portion is formed to be longer than at least half the maximum width of the cutting insert 1 in plan view, particularly in plan view.
- the length ratio between the first side portion 23 and the second side portion 24 may be appropriately determined according to various conditions such as the width of the groove to be cut.
- either one or both of the 1st edge part 23 and the 2nd edge part 24 are not linear form, The one part or the whole may be comprised from the curve.
- the lower surface 3 is also configured. First corners 31 that are raised corners and second corners 32 that are lowered corners are alternately provided at the edge of the lower surface 3, that is, at the intersecting ridge line portion between the lower surface 3 and the peripheral side surface 4.
- the lower surface 3 has a contour in which the first side portion 33 as the long side portion and the second side portion 34 as the short side portion are alternately connected via any one of the corners 31 and 32.
- the first and second corners 31, 32 on the lower surface 3 correspond to the first and second corners 21, 22 on the upper surface 2, respectively, and are configured to have the same inner angle as each of the first and second corners 21, 22. ing.
- the first and second side portions 33 and 34 on the lower surface 3 correspond to the first and second side portions 23 and 24 on the upper surface 2, respectively, and have the same length as each of the first and second side portions 23 and 24. It is configured as follows.
- a plurality of cutting edge portions 6, each of which is a set of cutting edges, are formed at the intersecting ridge line portion between the upper surface 2 and the peripheral side surface 4.
- a plurality of cutting edge portions 7, each of which is a set of cutting edges, are formed on the intersecting ridge line portion between the lower surface 3 and the peripheral side surface 4.
- the plurality of cutting edges 6, 7 of each of the upper and lower surfaces 2, 3 are formed substantially rotationally symmetrical about the axis A, and further, the plurality of cutting edges on the upper surface 2 are formed.
- the portion 6 and the plurality of cutting edge portions 7 on the lower surface 3 are formed so as to have a plane-symmetrical relationship with respect to the central plane M.
- the cutting edge portion 6 on the upper surface 2 side will be mainly described, and detailed description of the cutting edge portion 7 on the lower surface 3 side will be omitted.
- the upper cutting edge 6 corresponds to the first cutting edge of the present invention
- the lower cutting edge 7 corresponds to the second cutting edge of the present invention. May be reversed.
- each cutting edge portion 6 is formed with respect to the first corner 21, and has a main cutting edge 61, a secondary cutting edge 62, and a corner cutting edge 63 that connects these cutting edges 61, 62.
- the corner cutting edge 63 is formed along the first corner 21.
- the main cutting edge 61 is formed so as to extend from one end of the corner cutting edge 63 toward the adjacent second corner 22.
- the secondary cutting edge 62 is formed so as to extend from the other end of the corner cutting edge 63 toward the other second corner 22 adjacent thereto.
- the cutting edge portion 6 corresponds to the first cutting edge portion
- the main cutting edge 61 is the first main cutting edge
- the sub cutting edge 62 is the first sub cutting edge
- the corner cutting edge 63 is It may be referred to as the first corner cutting edge.
- the main cutting edge 61 is formed so as to extend along the first side portion 23.
- the sub cutting edge 62 is formed so as to extend along the second side portion 24.
- the main cutting edge 61 is longer than the auxiliary cutting edge 62 so as to correspond to the first side 23 being longer than the second side 24. That is, the distance between the first corner 21 and the second corner 22 between which the main cutting edge 61 extends is between the first corner 21 and the second corner 22 between which the sub cutting edge 62 extends. Longer than the distance.
- the main cutting edge 61 extends substantially over the entire first side portion 23 and reaches the adjacent second corner 22.
- the secondary cutting edge 62 extends substantially over the entire second side 24 and reaches the adjacent second corner 22.
- one cutting edge portion 6 extends over the entire range between the adjacent second corners 22, and two adjacent cuttings at both ends thereof, that is, the second corners 22 at both ends. Connect with the blade 6. As described above, the plurality of cutting edge portions 6 are continuous with each other via the second corner 22 here, but may not be continuous.
- each cutting edge (that is, second cutting edge) 7 is continuous to a corner cutting edge (that is, second corner cutting edge) 73 extending along the first corner 31 and one end of the corner cutting edge 73.
- a main cutting edge (that is, a second main cutting edge) 71 formed on the first side portion 33 and a sub-end formed on the second side portion 34 continuously to the other end portion of the corner cutting edge 73.
- a cutting edge (that is, a second auxiliary cutting edge) 72 is formed with respect to the first corner 31, and continues to another cutting edge portion 7 at the second corner 32.
- the rake face 64 for each cutting edge 6 on the upper surface 2 extends to the adjacent end face, that is, the upper surface 2, and the flank 65 for each cutting edge 6 extends to the peripheral side surface 4.
- a rake face 74 for each cutting edge 7 on the lower surface 3 extends to an adjacent end face, that is, the lower surface 3, and a flank 75 for each cutting edge 7 extends to the peripheral side surface 4.
- the first corners 21 and 31 are formed in the side cutter 8 so as to function as cutting corners.
- the corner cutting edges 63 and 73 of this cutting corner are formed so as to be involved in the cutting of the corners of the groove.
- the main cutting edges 61 and 71 are configured to participate in cutting of the bottom of the groove, and the sub cutting edges 62 and 72 are configured to participate in cutting of the side wall of the groove.
- the first corners 21 and 31 are formed to be curved with a constant curvature radius.
- the curvature radii of the first corners 21 and 31 can be appropriately changed according to the magnitude of the curvature provided at the corners of the groove to be processed.
- the curvature radius of the first corner 21 can be increased, and the curvature of the first corner 21 of the cutting insert 1A can be increased.
- the radius is, for example, 2.4 mm.
- the cutting insert 1A according to the second embodiment is different from the cutting insert 1 according to the first embodiment in terms of the curvature of the first corner 21 on the upper surface side and the first corner on the lower surface side (not shown). This is generally similar to the cutting insert 1. Therefore, further description of the cutting insert 1A of the second embodiment is omitted.
- the cutting insert 1 of the first embodiment has a substantially hexagonal outline as described above in plan view, three corners (first corners 21), that is, three cutting edges 6 are provided on the upper surface 2. It can be used for cutting, and three corners (first corner 31), that is, three cutting edges 7 can be used for cutting on the lower surface 3. That is, it is possible to use six corners, that is, six cutting edges, for the cutting in the vertical direction.
- the central plane M is a plane that is orthogonal to the axis A and bisects the cutting insert 1 and is shown in FIG. In a side view of the cutting insert 1 in FIG. 3, a straight line (reference) that passes through a central position between the upper surface 2 and the lower surface 3 and is orthogonal to the axis A (not shown in FIG. 3) of the cutting insert 1.
- the central plane M is represented as a line).
- each cutting edge 6 is formed so that it may become short gradually as it leaves
- the main cutting edge 61 of the cutting edge 6 is adjacent to the adjacent cutting edge 6 at the main cutting edge side end of the cutting edge 6 closest to the central plane M in the cutting edge 6, that is, in the second corner 22.
- the secondary cutting edge 62 is connected.
- each cutting edge portion 6 approaches the center plane M as the distance from the first corner 21 increases, and in the second corner 22, particularly the main cutting edge 61 side end.
- the entire cutting edge portion 6 has an inclination that is closest to the central plane M.
- the inclination angle of the cutting edge portion 6 with respect to the central plane M is preferably 3 degrees or more and 10 degrees or less.
- each of the cutting edges 61, 62, 63 in the single cutting edge portion 6 approaches the central plane M as it moves away from the first corner 21 and approaches the central plane M at the second corner 22.
- the main cutting edge 61 and the sub-cutting edge 62 may have a curved shape instead of a straight line.
- the inclination angle of these cutting edges is not always a constant angle, but may change during the cutting edge.
- the cutting edge portion 7 on the lower surface 3 side has the same characteristics as the cutting edge portion 6 on the upper surface 2 side, and is generally inclined with respect to the central plane M.
- the main cutting edge 71 of the cutting edge portion 7 is formed to be inclined at a predetermined angle so as to approach the central plane M as the distance from the first corner 31, that is, the corner cutting edge 73 increases.
- the auxiliary cutting edge 72 is formed to be inclined at a predetermined angle so as to approach the central plane M as the distance from the corner cutting edge 73 increases. Since the main cutting edge 71 is longer than the sub cutting edge 72, each cutting edge portion 7 is closest to the central plane M in the second corner 32, particularly at the end portion on the main cutting edge 71 side.
- the upper surface 2 is provided with an outer end surface portion 25 and an inner end surface portion 26 positioned inside the outer end surface portion 25, that is, near the axis A.
- the outer end face part 25 is provided adjacent to the corresponding or associated cutting edge part 6, and the upper face 2 has three outer end face parts 25.
- the three outer end surface portions 25 may be formed so as to be continuous and may be one outer end surface portion.
- the inner end surface portion 26 is formed in an annular shape so as to extend around the attachment hole 5.
- the inner end face portion 26 is formed closer to the central plane M than the outer end face portion 25, and is formed substantially parallel to the central plane M in the cutting insert 1 as seen particularly in FIG. 4.
- the top surface 2 is provided with three step surfaces 27 that connect the three outer end surface portions 25 and the one inner end surface portion 26.
- Each step surface 27 connects the adjacent outer end surface portion 25 and the inner end surface portion 26 and can also be referred to as a connection surface.
- the outer end surface portion 25, the inner end surface portion 26, and the step surface 27 as described above form a recess in the upper surface 2.
- the outer end face portion 25 is formed so as to function as a rake face 64 of the cutting edge portion 6, and is a surface formed along the main cutting edge 61, the auxiliary cutting edge 62 and the corner cutting edge 63 of the adjacent cutting edge portion 6. is there.
- the outer end surface portion 25 is formed so as to incline toward the lower surface 3 as it goes inward of the cutting insert 1, that is, to approach the central plane M (see FIG. 4).
- the outer end surface portion 25 is formed so that the width of the outer end surface portion 25 in the vicinity of the first corner 21 is the largest, but this can be changed as appropriate.
- the outer end face portion 25 is substantially configured as a single plane.
- the cutting edge portion 6 and the outer end face portion 25 are formed on the smooth extension surface of the outer end face portion 25 so that almost all of the adjacent cutting edge portions 6 extend.
- the height of the corner cutting edge 63 of the cutting edge portion 6 changes smoothly. . Therefore, even if the radius of curvature of the first corner 21 is changed variously, a highly accurate corner cutting edge shape can be maintained.
- the outer end surface portion 25 is not limited to being provided in this way, and can be formed with a single curved surface instead of a single flat surface. And it is not necessary for the whole of the adjacent cutting edge part to extend on the smooth extension surface of the outer side end surface part 25 provided as a single plane or a single curved surface, and it is good to extend at least a majority.
- the inner end face portion 26 is a surface formed at a position closer to the central plane M than the outer end face portion 25 as described above.
- the inner end surface portion 26 is a portion that comes into contact with the bottom wall surface of the insert mounting seat in the tool body 81 when the cutting insert 1 is attached to the tool body 81 as a side cutter body.
- the inner end surface portion 26 is a flat surface here, but is not limited thereto, and may be formed in a curved surface shape or an uneven shape.
- the step surface 27 is a surface formed so as to connect the inner end surface portion 26 and the outer end surface portion 25 as described above.
- the step surface 27 is inclined in the same manner as the outer end surface portion 25, but is inclined at an angle larger than the inclination angle of the outer end surface portion 25 with respect to the central plane M.
- the step surface 27 may be formed from a flat surface or a curved surface.
- the step surface 27 does not exist and a configuration in which the outer and inner end surface portions 25 and 26 are directly connected is possible, the step surface 27 is preferably provided.
- the stepped surface 27 chips produced by cutting with each cutting edge of the cutting edge portion 6 come into contact with the outer end face portion 25 as a rake face adjacent to the cutting edge portion 6, and flow rearward as it is. be able to.
- the outer end surface portion 25 is discontinuous with the inner end surface portion 26 and is inclined with a predetermined inclination with respect to the inner end surface portion 22 and the central plane M.
- the predetermined inclination of the outer end face part 25 is related to the inclination of the cutting edge part 6.
- the chips generated by the cutting by the associated cutting edge part 6 do not contact the inner end face part 26. Stipulated. Specifically, as can be understood from FIGS. 1, 2, and 4, as shown particularly in FIG. 4, an extended surface of the outer end surface portion 25 (a line E simplified in FIG. 4) is the outer end surface portion.
- the outer end surface portion 25 is inclined with respect to the inner end surface portion 26 and the central plane M so as to reach the axis A without intersecting the portion of the inner end surface portion 26 between the mounting hole 5 and the mounting hole 5. Therefore, according to this structure, it can suppress that such a chip touches the inner side end surface part 26.
- the chip slides on the outer end face part 25 as a rake face without contacting the inner end face part 26. It becomes possible to detach from the cutting insert 1. Therefore, damage to the inner end surface portion 26 due to chip contact can be prevented.
- the inner end surface portion 26 functions as a seating surface as described above. Therefore, when the inner end surface portion 26 becomes rough, the fixing property of the cutting insert 1 to the tool body 81 deteriorates. However, the cutting insert 1 can solve this problem.
- the lower surface 3 also has an outer end surface portion 35, an inner end surface portion 36, and a step surface 37, which form a recess in the lower surface 3.
- the outer end surface portion 35, the inner end surface portion 36, and the step surface 37 of the lower surface 3 correspond to the outer end surface portion 25, the inner end surface portion 26, and the step surface 27 of the upper surface 2, respectively. And similar changes are allowed.
- the cutting insert 1 of the first embodiment can be made of various materials and can have various coatings.
- the cutting insert 1 is preferably made from a hard material such as cemented carbide, coated cemented carbide, cermet, ceramic, or ultra-high pressure sintered body containing diamond or cubic boron nitride.
- the side cutter 8 equipped with the cutting insert 1 is shown in FIGS.
- the tool body 81 includes two substantially circular tool body end faces (hereinafter referred to as body end faces) 82 and 83 that are opposite to each other, an outer peripheral face 84 that connects the two body end faces, and two body end faces 82 and 83. And a bore hole 85 penetrating through the center.
- the side cutter 8, that is, the tool main body 81 is used by being rotated around a rotation axis C determined so as to extend to the center of the bore hole 85.
- the upper cutting edge 6 corresponds to the first cutting edge of the present invention
- the lower cutting edge 7 corresponds to the second cutting edge of the present invention. Therefore, here, one main body end surface 82 is a first main body end surface, and the other main body end surface 83 is a second main body end surface.
- a plurality of insert mounting seats 87 and a plurality of chip pockets 88 adjacent to the corresponding insert mounting seats 87 are provided on the outer peripheral portion 86 of the tool body 81, particularly the outer peripheral surface 84.
- the chip pocket 88 is provided for discharging chips.
- the insert mounting seat 87 is provided adjacent to the rear side in the tool rotation direction K of the adjacent chip pocket 88.
- the plurality of insert mounting seats 87 each configured to be detachably mountable with the cutting insert 1 are first insert mountings opened on the first main body end surface 82 which is one of the two main body end surfaces 82, 83.
- the seat 87A is composed of a second insert mounting seat 87B opened on the second body end surface 83, which is the other of the two body end surfaces 82 and 83, respectively.
- first insert mounting seats 87A and second insert mounting seats 87B are alternately arranged in a staggered manner.
- the circumferential interval between the first insert mounting seat 87A and the adjacent second insert mounting seat 87B is constant.
- the cutting insert 1 has auxiliary cutting edges 62 and 72 that project in the direction of the rotation axis C, and the main cutting edges 61 and 71 that are used. It is detachably attached so as to protrude in a direction perpendicular to the rotation axis (see FIGS. 6 and 7). That is, in the first insert mounting seat 87A and the second insert mounting seat 87B, the plurality of cutting inserts 1 project from either one of the main body end faces 82 and 83, respectively, and the main cutting edges 61 and 71 used are outer peripheral surfaces.
- the corner cutting edges 63 and 73 of the first corners 21 and 31 as the cutting corners to be used are mounted in a flat position so as to protrude from the region connecting the end face of the main body and the outer peripheral surface. Then, the rotation trajectory of the main cutting edge 61 of the cutting insert 1 attached with respect to the first main body end surface 82 and the rotation trajectory of the main cutting edge 71 of the cutting insert 1 attached with respect to the second main body end surface 83 overlap each other. Thus, the some cutting insert 1 is mounted
- Each of the insert mounting seats 87 has a bottom wall surface 87c and a side wall surface 87d.
- an end surface (upper surface 2 in FIG. 8) that is not related to the cutting edge portion used for the cutting insert is brought into contact with the bottom wall surface 87c as a seating surface. Is brought into contact with the side wall surface 87d.
- the protruding portion 87 e provided on the bottom wall surface 87 c enters the recess of the cutting insert 1 and contacts the inner end surface portion 26.
- the mounting screw 89 is screwed into the screw hole 87f of the bottom wall surface 87c through the mounting hole 5 of the cutting insert 1.
- the cutting insert 1 is detachably attached to the insert mounting seat 87.
- the cutting tool 8 with the plurality of cutting inserts 1 mounted thereon that is, the side cutter 8 is rotated around the rotation axis C and used to process a groove on the work material.
- the first corners 21 and 31 of the cutting insert 1 function as cutting corners, and the used corner cutting edges 63 and 73 formed there are involved in cutting the corners of the groove.
- the main cutting edges 61 and 71 of the cutting insert 1 are involved in cutting the bottom of the groove, and the secondary cutting edges 62 and 72 are involved in cutting the side wall of the groove.
- the main cutting edges 61 and 71 of the cutting insert 1 are arranged substantially parallel to the rotation axis C of the cutting tool 81. And in each of the upper and lower surfaces of the cutting insert 1, the outline is shorter than the 1st edge parts 23 and 33 between the 1st and 2nd corners where the main cutting edge extends, and the 1st edge parts 23 and 33, and The second side portions 24 and 34 between the first and second corners where the auxiliary cutting edge extends are alternately adjacent to each other. Therefore, in the cutting tool 8 in which the cutting insert 1 is disposed on the tool body 81, the width of the rotation locus of the cutting insert 1 is considerably narrower than the size of the cutting insert 1.
- the width W of the blade portion 90 can be considerably shortened. Therefore, the cutting insert 1 can cope with grooving of various widths.
- the cutting edges 6 and 7 are farthest away from the central plane M by the corner cutting edges 63 and 73, and the main cutting edges 61 and 71 or the auxiliary cutting edges 62, from the corner cutting edges 63 and 73, It is formed so as to be inclined so as to approach the central plane M as it moves away along 72.
- the inclination of the outer end face portions 25 and 35 can also contribute to the control of the chip discharge direction.
- the generated chips are guided in a direction away from the cutting corners 21 and 31 (that is, the tool main body side) due to the inclination of the used cutting edge portions 6 and 7 and the like.
- the possibility of the chips damaging the groove wall can be greatly reduced.
- chips may damage the groove walls and deteriorate the surface roughness.
- This can be solved.
- the reason why the inclination angle of the cutting edge with respect to the central plane M is preferably in the range of 3 ° to 10 ° is that if the inclination angle is smaller than 3 °, the effect of guiding chips is small, and the inclination angle is 10 °. This is because if the degree is larger than the degree, the possibility that chips are carried to the groove wall on the opposite side increases.
- the cutting insert 1 and the cutting tool 8 which concern on 1st Embodiment of this invention were demonstrated, various changes are accept
- the main cutting edges 61 and 71 and the auxiliary cutting edges 62 and 72 of the cutting edges 6 and 7 are separated from the corner cutting edges 63 and 73, respectively. Therefore, it is inclined to approach the central plane M.
- each of these cutting edges 61, 62, 71, 72 is not limited to being tilted as a whole, but as the distance from the corner cutting edge increases as described above, so as to control the flow direction of chips. You may partially have the inclination part which approaches a center plane.
- the interval between the insert mounting seats 87A and 87B adjacent in the circumferential direction may not be constant.
- the circumferential interval between the second insert mounting seat 87B adjacent to the front side in the rotational direction of the first insert mounting seat 87A is the second adjacent to the rear side in the rotational direction of the same first insert mounting seat 87A. It may be different from the circumferential interval between the two insert mounting seats 87B.
- FIG. 1 the same reference numerals are used for the same components as those already described, and a duplicate description thereof is omitted.
- the three cutting edge portions 6 and 7 are provided at the intersecting ridge portions of the end surfaces 2 and 3 and the peripheral side surface 4 in the same manner as the cutting insert 1 of the first embodiment.
- the corner cutting edges 63 and 73 of the respective cutting edge portions 6 and 7 extend substantially parallel to the central plane M.
- the first corners 21 and 31 extend substantially parallel to the central plane M.
- the corner cutting edges 63 and 73 are set to have an inclination of substantially 0 with respect to the central plane M, and only the main cutting edges 61 and 71 and the auxiliary cutting edges 62 and 72 have a certain degree with respect to the central plane M.
- the predetermined inclination is provided.
- the inclination of a part of the main cutting edges 61 and 71 and the inclination of the sub cutting edges 62 and 72 are the same as the inclination of the main cutting edge and the sub cutting edge in the first embodiment.
- each of the cutting edge portions 6 and 7 and the central plane M is the connecting portion (that is, the second corner) between the adjacent cutting edge portions. 22 and 32), the first side portions 23 and 33, that is, the portions (the closest portions) 61a and 71a located at the main cutting edges 61 and 71, which are separated from the second corners 22 and 32, are the shortest.
- each main cutting edge 61, 71 has two portions 61b, 61c; 71b, 71c having an inclination opposite to each other.
- the inclination of the main cutting edge 61 with respect to the central plane M of one first corner-side inclined portion 61b is opposite to the inclination of the other second corner-side inclined portion 61c with respect to the central plane M.
- the chip receives a force to bend in the width direction by cutting with the main cutting edge. Therefore, curved chips are generated.
- Such curved chips are easy to guide because they are small and easy to break.
- chips are small and round, they do not get tangled in the tool and are easy to process. In grooving, it is one of the problems that chips remain in a narrow space inside the groove, and such a configuration is a great advantage.
- the closest portions 61a and 71a with respect to the central plane M of the cutting edge portions 6 and 7 are as shown in the partially enlarged view of FIG. 13 (the portion 71a is not shown in FIG. 13).
- the main cutting edge 61 protrudes outward from the cutting insert 101 and is formed to be bent. That is, in the cutting edge portion 6, the main cutting edge 61 is connected to the first corner-side inclined portion 61 b connected to the first corner 21 and the first corner-side inclined portion 61 b on one side, and on the other side of the adjacent cutting edge portion 6.
- the second corner side inclined portion 61c connected to the sub cutting edge 62 has a difference in inclination between the first corner side inclined portion 61b and the second corner side inclined portion 61c in plan view (angle ⁇ in FIG. 13). Convex shape.
- the cutting edge portion 7 on the lower surface 3 side is also configured in the same manner as the cutting edge portion 6, and corresponds to a first corner-side inclined portion 71b corresponding to the first corner-side inclined portion 61b and a second corner-side inclined portion 61c. And a second corner side inclined portion 71c.
- the rotational trajectory of the main cutting edges 61 and 71 in the cutting tool is concave. It becomes a shape. Therefore, it is easy to form a step on the processed surface of the work material, that is, the groove bottom surface, simply by providing this configuration on the main cutting edge.
- the main cutting edges 61a, 71a are formed so as to protrude in plan view at the closest parts 61a, 71a.
- the rotation trajectory of the cutting edges 61 and 71 can be made into a smooth cylindrical shape or close to it. Therefore, in the grooving with the side cutter to which the cutting insert 101 is attached, it is possible to suppress the occurrence of a step on the bottom surface of the groove, and the bottom surface of the groove can be made substantially flat.
- the main cutting edges 61 and 71 of the cutting insert 101 having such a configuration can improve the flatness of the processed surface.
- the first corner internal angle ⁇ of the first corner 21 which is a cutting corner is made an obtuse angle (see FIG. 11).
- the sub-cutting blades 62 and 72 with a wiping blade.
- the wiping blade may be linear or curved.
- the outer end surface portions 25 and 35 that expand adjacent to the first corners 21 and 31 protrude wider toward the axis A side. It is formed (see FIG. 11). Therefore, the area of the rake face related to the cutting edge portions 6 and 7 increases. Thereby, the influence of the rake face with respect to the chips becomes large, and it is possible to more suitably suppress the chips from coming into contact with the inner end face part serving as the seating surface and other unused cutting edge parts.
- the outer end surface portions 25 and 35 of the cutting insert 101 are constituted by a plurality of surface portions each having an inclination adapted to the adjacent cutting edge portion because the cutting edge portions 6 and 7 have the above-described configuration. Has been. However, the outer end surface portions 25 and 35 of the cutting insert 101 may be substantially configured as a single curved surface.
- an identification mark RM is provided on the inner end face portion 26 in the vicinity of the cutting corner 21.
- This identification mark RM has different patterns on the upper surface 2 and the lower surface 3 (the lower surface 3 is not shown).
- the cutting insert 101 of 3rd Embodiment is detachably attached to the insert mounting seat of the tool main body of a side cutter similarly to the cutting insert 1 of the said 1st Embodiment, and is used for the process of a groove
- description of the side cutter which is a rotary cutting tool of 3rd Embodiment is abbreviate
- FIG. 1 the same reference numerals are used for the same components as those already described, and a duplicate description thereof is omitted.
- the peripheral side surface 4 serving as a flank has a configuration protruding outward and is substantially barrel-shaped.
- the peripheral side surface 4 has an upper side surface portion 41 connected to the upper surface 2 via the associated cutting edge portion 6 and a lower side surface portion 42 connected to the lower surface 3 via the associated cutting edge portion 7 with the central plane M as a boundary. It is divided into and.
- the three cutting edge portions 6 are substantially continuous to the intersecting ridge line portion of the upper surface 2 and the peripheral side surface 4, and
- the cutting edge portion 7 is substantially continuous with the intersecting ridge line portion between the lower surface 3 and the peripheral side surface 4. Therefore, each of the upper side surface portion 41 and the lower side surface portion 42 is an annular shape, and is an aggregate of three side surface portions each associated with one cutting edge portion.
- An independent upper side surface portion or lower side surface portion may be formed for each one cutting edge portion.
- the upper side surface portion 41 and the lower side surface portion 42 are each formed to be inclined toward the outer side of the cutting insert toward the central plane M. That is, the upper side surface portion 41 is provided with a negative clearance angle with respect to the cutting edge portion 6 from the upper surface 2 toward the lower surface 3. Similarly, the lower side surface portion 42 is provided with a negative clearance angle with respect to the cutting edge portion 7 from the lower surface 3 toward the upper surface 2.
- the upper side surface portion 41 corresponds to the first side surface portion of the present invention and the lower side surface portion 42 corresponds to the second side surface portion of the present invention, these relationships may be reversed.
- the connecting portion between the upper side surface portion 41 and the lower side surface portion 42 is not limited to being simply formed in a linear shape, and may be formed in a curved surface shape.
- the upper side surface portion 41 and the lower side surface portion 42 do not necessarily have to be inclined as described above throughout, for example, a portion inclined toward the outer side of the cutting insert toward the central plane M. On the associated end face side.
- This cutting insert 201 is attached to the tool body of a rotary cutting tool that is a side cutter, and is used for grooving, like the cutting insert 1 described above.
- the peripheral side surface 4 is configured like the cutting insert 201 of the fourth embodiment, and the side wall surface of the insert mounting seat is formed into a concave shape adapted to the peripheral side surface, so that the cutting insert 201 is a side cutter tool. Even when such a force in the direction of pulling away from the main body acts on the cutting insert, the tool main body exerts a force in the direction of pressing the cutting insert 201 against the insert mounting seat. Therefore, the cutting insert 201 can be fixed more stably.
- FIG. 1 the same reference numerals are used for the same components as those already described, and a duplicate description thereof is omitted.
- the side portions 43 and 44 of the peripheral side surface 4 adjacent to the main cutting edges 61 and 71 and the corner cutting edges 63 and 73 are inclined surface portions as in the cutting insert 201 of the fourth embodiment. It is said.
- the surface portion of the peripheral side surface 4 adjacent to the auxiliary cutting edges 62 and 72 (the auxiliary cutting edge 62 on the upper surface 2 side and the auxiliary cutting on the lower surface 3 side that is substantially plane-symmetric with the auxiliary cutting edge 62 with respect to the central plane M).
- the surface portion 45 between the blade 72 and the blade 72 is formed as a single plane and is formed so as to extend substantially in parallel with the axis A.
- the rotary cutting tool 308 which is a side cutter to which the cutting insert 301 is detachably attached is shown in FIG.
- the surface portion 45 of the peripheral side surface 4 adjacent to the auxiliary cutting edges 62 and 72 is one of the locations closest to the side wall portion of the groove during the cutting process. Therefore, according to the cutting insert 301, the fixing effect of the cutting insert mentioned above regarding the cutting insert 201 of 4th Embodiment can be acquired, avoiding that the surface part 45 interferes with a groove wall as much as possible.
Abstract
Description
互いに対して反対側にある第1端面および第2端面であって、該第1端面および該第2端面の各々は該第1端面と該第2端面とを貫通して延びるように定義される軸線の周りに実質的に回転対称の輪郭を有し、該第1端面の輪郭と該第2端面の輪郭とは該軸線に直交すると共に該切削インサートを二等分するように定義される中央平面に関して実質的に面対称であり、該第1端面および該第2端面の各々では、高められたコーナと、該高められたコーナよりも大きい内角を有すると共に該高められたコーナよりも該中央平面に近い低められたコーナとが交互に位置する、第1端面および第2端面と、
該第1端面と該第2端面との間に延在する周側面と、
該第1端面と該周側面との交差稜線部に形成された少なくとも3つの第1切れ刃部であって、各々が関連付けられた高められたコーナに沿って延在するコーナ切れ刃と、該コーナ切れ刃の一方の端部から隣の一方の低められたコーナに向けて延在する主切れ刃と、該コーナ切れ刃の他方の端部から隣のもう一方の低められたコーナに向けて延在する副切れ刃とを有し、間に該主切れ刃が延在する該高められたコーナと該一方の低められたコーナとの間の距離は、間に該副切れ刃が延在する該高められたコーナと該もう一方の低められたコーナとの間の距離よりも長く、該主切れ刃は該コーナ切れ刃から離れるにしたがって該中央平面に近づく傾斜部分を有し、該副切れ刃は該コーナ切れ刃から離れるにしたがって該中央平面に近づく傾斜部分を有する、第1切れ刃部と、
該第2端面と該周側面との交差稜線部に形成された少なくとも3つの第2切れ刃部であって、各々が関連付けられた高められたコーナに沿って延在するコーナ切れ刃と、該コーナ切れ刃の一方の端部から隣の一方の低められたコーナに向けて延在する主切れ刃と、該コーナ切れ刃の他方の端部から隣のもう一方の低められたコーナに向けて延在する副切れ刃とを有し、間に該主切れ刃が延在する該高められたコーナと該一方の低められたコーナとの間の距離は、間に該副切れ刃が延在する該高められたコーナと該もう一方の低められたコーナとの間の距離よりも長く、該主切れ刃は該コーナ切れ刃から離れるにしたがって該中央平面に近づく傾斜部分を有し、該副切れ刃は該コーナ切れ刃から離れるにしたがって該中央平面に近づく傾斜部分を有する、第2切れ刃部と
を備える、切削インサートが提供される。
互いに対して反対側にある第1工具本体端面および第2工具本体端面と、該第1工具本体端面と該第2工具本体端面との間の外周面とを有する工具本体を備え、該工具本体に複数の切削インサートが着脱自在に取り付けられる、回転切削工具において、
上で述べたような切削インサートが該第1切れ刃部を使用するように取り付けられる、該第1工具本体端面に開いた少なくとも1つの第1インサート取付座と、
上で述べたような切削インサートが該第2切れ刃部を使用するように取り付けられる、該第2工具本体端面に開いた少なくとも1つの第2インサート取付座と
を備えた、
回転切削工具が提供される。
Claims (12)
- 互いに対して反対側にある第1端面(2)および第2端面(3)であって、該第1端面および該第2端面の各々は該第1端面と該第2端面とを貫通して延びるように定義される軸線(A)の周りに実質的に回転対称の輪郭を有し、該第1端面の輪郭と該第2端面の輪郭とは該軸線に直交すると共に該切削インサートを二等分するように定義される中央平面Mに関して実質的に面対称であり、該第1端面および該第2端面の各々では、高められたコーナ(21、31)と、該高められたコーナよりも大きい内角を有すると共に該高められたコーナよりも該中央平面に近い低められたコーナ(22、32)とが交互に位置する、第1端面(2)および第2端面(3)と、
該第1端面と該第2端面との間に延在する周側面(4)と、
該第1端面と該周側面との交差稜線部に形成された少なくとも3つの第1切れ刃部(6)であって、各々が関連付けられた高められたコーナに沿って延在するコーナ切れ刃(63)と、該コーナ切れ刃の一方の端部から隣の一方の低められたコーナに向けて延在する主切れ刃(61)と、該コーナ切れ刃の他方の端部から隣のもう一方の低められたコーナに向けて延在する副切れ刃(62)とを有し、間に該主切れ刃が延在する該高められたコーナと該一方の低められたコーナとの間の距離は、間に該副切れ刃が延在する該高められたコーナと該もう一方の低められたコーナとの間の距離よりも長く、該主切れ刃(61)は該コーナ切れ刃から離れるにしたがって該中央平面に近づく傾斜部分を有し、該副切れ刃(62)は該コーナ切れ刃から離れるにしたがって該中央平面に近づく傾斜部分を有する、第1切れ刃部(6)と、
該第2端面と該周側面との交差稜線部に形成された少なくとも3つの第2切れ刃部(7)であって、各々が関連付けられた高められたコーナに沿って延在するコーナ切れ刃(73)と、該コーナ切れ刃の一方の端部から隣の一方の低められたコーナに向けて延在する主切れ刃(71)と、該コーナ切れ刃の他方の端部から隣のもう一方の低められたコーナに向けて延在する副切れ刃(72)とを有し、間に該主切れ刃が延在する該高められたコーナと該一方の低められたコーナとの間の距離は、間に該副切れ刃が延在する該高められたコーナと該もう一方の低められたコーナとの間の距離よりも長く、該主切れ刃(71)は該コーナ切れ刃から離れるにしたがって該中央平面に近づく傾斜部分を有し、該副切れ刃(72)は該コーナ切れ刃から離れるにしたがって該中央平面に近づく傾斜部分を有する、第2切れ刃部(7)と
を備える、切削インサート(1、1A、101、201、301)。 - 各第1切れ刃部(6)において、前記コーナ切れ刃(63)は前記中央平面(M)と略平行に形成されていて、
各第2切れ刃部(7)において、前記コーナ切れ刃(73)は前記中央平面(M)と略平行に形成されている、
請求項1に記載の切削インサート(101)。 - 前記第1切れ刃部(6)と前記中央平面(M)との間の距離は、該第1切れ刃部の前記主切れ刃(61)における隣の低められたコーナ(22)から離れた部分(61a)で、最も短く、
前記第2切れ刃部(7)と前記中央平面(M)との間の距離は、該第2切れ刃部の前記主切れ刃(71)における隣の低められたコーナ(32)から離れた部分(71a)で、最も短い、
請求項1または2に記載の切削インサート(101)。 - 前記第1端面(2)の平面視において、前記第1切れ刃部の前記主切れ刃(61)は、該主切れ刃における隣の低められたコーナから離れた前記部分(61a)で切削インサート外方側に突き出るように形成されていて、
前記第2端面(3)の平面視において、前記第2切れ刃部の前記主切れ刃(71)は、該主切れ刃における隣の低められたコーナから離れた前記部分(71a)で切削インサート外方側に突き出るように形成されている、
請求項3に記載の切削インサート(101)。 - 前記第1切れ刃部(6)の前記主切れ刃(61)は、隣の第1切れ刃部(6)の前記副切れ刃(62)と、前記低められたコーナ(22)でつながり、
前記第1切れ刃部(6)と前記中央平面(M)との間の距離は、該第1切れ刃部の主切れ刃側端部で、最も短く、
前記第2切れ刃部(7)の前記主切れ刃(71)は、隣の第2切れ刃部(7)の前記副切れ刃(72)と、前記低められたコーナ(32)でつながり、
前記第2切れ刃部(7)と前記中央平面(M)との間の距離は、該第2切れ刃部の主切れ刃側端部で、最も短い、
請求項1または2に記載の切削インサート(1、1A、201、301)。 - 前記第1端面(2)の前記高められたコーナ(21)の内角は鈍角であり、前記第1切れ刃部(6)の前記副切れ刃(62)にさらい刃が形成されていて、
前記第2端面(3)の前記高められたコーナ(31)の内角は鈍角であり、前記第2切れ刃部(7)の前記副切れ刃(72)にさらい刃が形成されている、
請求項1から5のいずれか一項に記載の切削インサート(101)。 - 前記第1端面(2)は、各々が関連付けられた第1切れ刃部に隣接して該第1切れ刃部のすくい面として機能するように形成された少なくとも1つの外側端面部(25)と、該外側端面部よりも内側に位置すると共に該外側端面部よりも前記中央平面の近くに形成された内側端面部(26)とを有し、
前記第2端面(3)は、各々が関連付けられた第2切れ刃部に隣接して該第2切れ刃部のすくい面として機能するように形成された少なくとも1つの外側端面部(35)と、該外側端面部よりも内側に位置すると共に該外側端面部よりも前記中央平面の近くに形成された内側端面部(36)とを有する、
請求項1から6のいずれか一項に記載の切削インサート(1、1A、101、201、301)。 - 前記第1端面(2)において、前記外側端面部(25)は単一平面または単一曲面で形成され、該外側端面部の滑らかな延長面上に隣接する前記第1切れ刃部(6)の少なくとも過半が延び、
前記第2端面(3)において、前記外側端面部(35)は単一平面または単一曲面で形成され、該外側端面部の滑らかな延長面上に隣接する前記第2切れ刃部(7)の少なくとも過半が延びる、
請求項7に記載の切削インサート(1、1A、201、301)。 - 前記第1端面(2)において、前記外側端面部(25)は、前記内側端面部(26)と不連続であると共に前記中央平面(M)に対して傾いていて、
前記第2端面(3)において、前記外側端面部(35)は、前記内側端面部(36)と不連続であると共に前記中央平面(M)に対して傾いている、
請求項7または8に記載の切削インサート(1、1A、101、201、301)。 - 前記周側面(4)は、関連付けられた第1切れ刃部を介して前記第1端面につながる第1側面部分(41、43)と、関連付けられた第2切れ刃部を介して前記第2端面につながる第2側面部分(42、44)とを有し、
該第1側面部分と該第2側面部分とは、それぞれ、該中央平面に向けて、切削インサート外方側に傾いている部分を有する、
請求項1から9のいずれか一項に記載の切削インサート(201、301)。 - 前記第1側面部分(41、43)は関連付けられた第1切れ刃部(6)の前記主切れ刃(61)および前記コーナ切れ刃(63)に隣接して形成され、
前記第2側面部分(42、44)は関連付けられた第2切れ刃部(7)の前記主切れ刃(71)および前記コーナ切れ刃(73)に隣接して形成されていて、
前記第1切れ刃部(6)の前記副切れ刃(62)と、前記中央平面(M)に関して該第1切れ刃部(6)と実質的に面対称な前記第2切れ刃部(7)の前記副切れ刃(72)との間の前記周側面の部分(45)は単一平面で形成されている、請求項10に記載の切削インサート(301)。 - 互いに対して反対側にある第1工具本体端面(82)および第2工具本体端面(83)と、該第1工具本体端面と該第2工具本体端面との間の外周面(84)とを有する工具本体(81)を備え、該工具本体に複数の切削インサートが着脱自在に取り付けられる、回転切削工具(8、308)において、
請求項1から11のいずれか一項に記載の切削インサートが前記第1切れ刃部(6)を使用するように取り付けられる、前記第1工具本体端面に開いた少なくとも1つの第1インサート取付座(87A)と、
請求項1から11のいずれか一項に記載の切削インサートが前記第2切れ刃部(7)を使用するように取り付けられる、前記第2工具本体端面に開いた少なくとも1つの第2インサート取付座(87B)と
を備えた、
回転切削工具(8、308)。
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US20140377020A1 (en) | 2014-12-25 |
CN104114307B (zh) | 2016-01-20 |
US9370832B2 (en) | 2016-06-21 |
JP5825420B2 (ja) | 2015-12-02 |
EP2818269B1 (en) | 2016-05-25 |
EP2818269A4 (en) | 2015-09-16 |
CN104114307A (zh) | 2014-10-22 |
JPWO2013125542A1 (ja) | 2015-07-30 |
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