WO2014148515A1 - 切削インサート及び刃先交換式切削工具 - Google Patents
切削インサート及び刃先交換式切削工具 Download PDFInfo
- Publication number
- WO2014148515A1 WO2014148515A1 PCT/JP2014/057414 JP2014057414W WO2014148515A1 WO 2014148515 A1 WO2014148515 A1 WO 2014148515A1 JP 2014057414 W JP2014057414 W JP 2014057414W WO 2014148515 A1 WO2014148515 A1 WO 2014148515A1
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- WIPO (PCT)
- Prior art keywords
- cutting
- cutting edge
- insert
- corner
- end surface
- 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
- B23C5/02—Milling-cutters characterised by the shape of the cutter
- B23C5/10—Shank-type cutters, i.e. with an integral shaft
- B23C5/109—Shank-type cutters, i.e. with an integral shaft with removable 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
- 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
- B23C5/22—Securing arrangements for bits or teeth or cutting inserts
- B23C5/2204—Securing arrangements for bits or teeth or cutting inserts with cutting inserts clamped against the walls of the recess in the cutter body by a clamping member acting upon the wall of a hole in the insert
- B23C5/2208—Securing arrangements for bits or teeth or cutting inserts with cutting inserts clamped against the walls of the recess in the cutter body by a clamping member acting upon the wall of a hole in the insert for plate-like cutting inserts
- B23C5/2213—Securing arrangements for bits or teeth or cutting inserts with cutting inserts clamped against the walls of the recess in the cutter body by a clamping member acting upon the wall of a hole in the insert for plate-like cutting inserts having a special shape
-
- 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
- B23C2200/0494—Rectangular
-
- 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
- B23C2200/081—Rake or top surfaces with projections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/04—Angles
- B23C2210/0407—Cutting angles
- B23C2210/0442—Cutting angles positive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/04—Angles
- B23C2210/0407—Cutting angles
- B23C2210/0442—Cutting angles positive
- B23C2210/045—Cutting angles positive axial rake angle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/04—Angles
- B23C2210/0407—Cutting angles
- B23C2210/0442—Cutting angles positive
- B23C2210/0457—Cutting angles positive radial rake angle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/16—Fixation of inserts or cutting bits in the tool
- B23C2210/168—Seats for cutting inserts, supports for replacable cutting bits
Definitions
- the present invention relates to a cutting insert and a cutting edge exchangeable cutting tool on which the cutting insert is mounted.
- the present invention relates to a cutting insert in which cutting edges are formed on both two opposing end faces, and a blade-tip-exchange-type rotary cutting tool that is detachably mounted.
- cutting inserts that are mounted on a blade-tip-exchange-type rotary cutting tool include a type of cutting insert in which cutting edges are formed on both the upper and lower surfaces that are two end surfaces. Some of these cutting inserts, for example, can be turned over so that the upper surface and the lower surface can be exchanged and attached to the tool body, and have more cutting edges than those of the single-sided type. Therefore, such a double-sided use type cutting insert is economical.
- Patent Document 1 discloses an example of a double-sided use type cutting insert that has cutting edges of the same shape on the upper and lower surfaces.
- the cutting insert basically includes an upper surface and a lower surface each having a substantially rectangular shape, and a peripheral side surface connecting them.
- On the upper surface a corner cutting edge is formed in each of the pair of corners on the diagonal.
- the main cutting edge is formed at the longitudinal ridge line portion extending from the corner where the corner cutting edge is formed, and the sub cutting edge is formed at the short ridge line portion extending from the corner in a direction different from the longitudinal ridge line portion. .
- the main cutting edge is longer than the secondary cutting edge.
- a corner cutting edge, a main cutting edge, and a sub cutting edge are formed on the lower surface.
- the four corner cutting edges are arranged on the upper and lower surfaces so that the diagonal line connecting the corner cutting edges on the diagonal of the lower surface intersects the diagonal line connecting the corner cutting edges on the upper surface.
- four corners are arranged so that the upper corner cutting edge and the lower corner cutting edge do not line up.
- the cutting insert is attached to the tool body so that the lower surface abuts against the bottom wall surface of the insert seat of the tool body.
- the cutting insert is attached to the tool body so that the upper surface contacts the bottom wall surface of the insert seat of the tool body.
- the cutting edge formed in one surface is concerned in cutting.
- the cutting edge formed on the other surface may come into contact with the bottom wall surface of the insert seat and wear or deformation may occur there.
- the seating surface of the upper surface or the lower surface that is in contact with the bottom wall surface of the insert seat is formed around the mounting hole, and is separated from the edges of the upper and lower surfaces to some extent.
- the seating surface that comes into contact with the bottom wall surface of the insert seat is provided inside the insert away from the cutting edge (that is, the intersecting ridge line portion between the upper surface or the lower surface and the peripheral side surface),
- This cutting insert is supported by the bottom wall surface of the insert seat only at the central portion around the mounting holes on the upper and lower surfaces, and has a problem in terms of supporting the cutting insert.
- the cutting insert is supported only in the central part around the mounting hole of the cutting insert, there is a possibility that problems such as chatter and chipping due to the swinging of the cutting edge may occur when a large force is applied to the cutting edge. There is.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a cutting insert and a cutting edge exchangeable cutting tool that can receive force acting on the cutting edge more firmly.
- first and second end surfaces each having a substantially polygonal shape, a peripheral side surface extending between the first and second end surfaces, a first end surface, and A plurality of cutting edge sections formed along intersecting ridges between each of the second end faces and the peripheral side surface, each cutting edge section including a corner cutting edge provided in a corner portion, and the corner cutting edge;
- a plurality of cutting edge sections including a main cutting edge connected to one end of the blade and a secondary cutting edge connected to the other end of the corner cutting edge, and at least in each of the first end face and the second end face
- Two cutting edge sections and a seating surface are formed, each cutting edge section has a rake face at an adjacent end face, at least a portion of each cutting edge section projects at least in the insert thickness direction, and the first end face and the first On one of the two end faces
- the non-cutting cross-ridge region extending between adjacent adjacent cutting edge sections is at least part of a portion consisting of a corner cutting edge and a main cutting edge of an
- the non-cutting cross ridge line region may be the non-cutting cross ridge line part itself which is a part of the cross ridge line part between the end face and the peripheral side surface, or a certain width or region including the non-cutting cross ridge line part.
- the width or range of this non-cutting intersection ridgeline region is preferably designed from the standpoint of supporting this cutting insert.
- the non-cutting crossing ridge line region on one of the first end surface and the second end surface is at least one of a portion composed of a corner cutting edge and a main cutting edge of an adjacent cutting edge section on the other of the first end surface and the second end surface. It is good to extend in the insert thickness direction back side of a part.
- the seating surface extends between adjacent cutting edge sections and is integrated with the non-cutting cross-ridge line region.
- the plurality of cutting edge sections are arranged and formed to have rotational symmetry with respect to a first axis defined to extend in the insert thickness direction so as to penetrate the first end surface and the second end surface, and It can be arranged to have rotational symmetry with respect to a second axis that is orthogonal and that passes through the circumferential side.
- the non-cutting crossing ridge line region on one of the first end surface and the second end surface is a part of the main cutting edge of the cutting edge section on the other of the first end surface and the second end surface, and a part of the secondary cutting edge through the corner cutting edge. Can be adjacent to the part in the insert thickness direction.
- the non-cutting cross ridge line region at one of the first end surface and the second end surface may include a part of the main cutting edge of the cutting edge section and the corner cutting edge and the insert at the other of the first end surface and the second end surface. Adjacent in the thickness direction.
- the non-cutting cross ridge line region on one of the first end surface and the second end surface is adjacent to only the corner cutting edge of the cutting edge section on the other of the first end surface and the second end surface in the insert thickness direction.
- the cutting edge section further includes a second corner cutting edge different from the corner cutting edge and connected to the secondary cutting edge, wherein the first end face and the second edge
- the non-cutting cross ridge line region on one of the end faces can be adjacent to only a part of the main cutting edge of the cutting edge section on the other of the first end face and the second end face in the insert thickness direction.
- a blade-tip-exchange-type rotary cutting tool that includes a tool body on which at least one insert seat is formed, and in which a cutting insert is detachably attached to the insert seat.
- the cutting insert used in this cutting tool is a cutting insert as described above.
- the insert seat has a bottom wall surface that contacts the seating surface of the cutting insert.
- the cutting insert is attached to the insert seat to use one cutting edge section at one of the first end face and the second end face, the first end face and the second end of the cutting insert adjacent to the cutting edge section.
- the non-cutting cross ridge line region on the other end face is supported by the insert seat.
- the bottom wall surface of the insert seat may include a portion that can come into contact with the non-cutting cross ridge line region of the cutting insert.
- the bottom wall surface of the insert seat may integrally include a portion that can contact the non-cutting cross ridge line region of the cutting insert, but may include another portion that is separated from the portion.
- the non-cutting cross-ridge region extending between adjacent cutting edge sections on one of the first end surface and the second end surface is on the other of the first end surface and the second end surface. It adjoins at least one part of the part which consists of a corner cutting edge and a main cutting edge of a cutting blade section via a surrounding side surface. Therefore, the support capability of the cutting insert can be enhanced by supporting the non-cutting cross ridge line region with the insert seat. As a result, even when a large cutting force is applied to at least a part of the corner cutting edge and the main cutting edge in the cutting edge section on the opposite side of the non-cutting cross ridge line region, the force acting on the cutting edge is further increased. It can be received or received firmly, and the oscillation of the entire cutting edge is greatly suppressed, and the occurrence of chatter and chipping can be significantly reduced.
- FIG. 1 is a perspective view of a cutting insert according to the first embodiment of the present invention.
- FIG. 2A shows a plan view of the cutting insert of FIG.
- FIG. 2B shows a front view of the cutting insert of FIG.
- FIG. 2C shows a bottom view of the cutting insert of FIG.
- FIG. 2D shows a left side view of the cutting insert of FIG.
- FIG. 3 is a perspective view of a cutting insert according to the second embodiment of the present invention.
- 4A shows a plan view of the cutting insert of FIG. 4B shows a front view of the cutting insert of FIG. 4C shows a bottom view of the cutting insert of FIG. 4D shows a left side view of the cutting insert of FIG.
- FIG. 5 is a perspective view of a cutting insert according to a third embodiment of the present invention.
- FIG. 6A shows a plan view of the cutting insert of FIG. 6B shows a front view of the cutting insert of FIG. 6C shows a bottom view of the cutting insert of FIG. 6D shows a left side view of the cutting insert of FIG.
- FIG. 7 is a perspective view of a cutting insert according to the fourth embodiment of the present invention.
- FIG. 8A shows a plan view of the cutting insert of FIG.
- FIG. 8B shows a front view of the cutting insert of FIG.
- FIG. 8C shows a bottom view of the cutting insert of FIG.
- FIG. 8D shows a left side view of the cutting insert of FIG.
- FIG. 9 shows a perspective view of the blade-tip-exchange-type rotary cutting tool of the first embodiment to which the cutting insert of the first embodiment is attached.
- FIG. 9 shows a perspective view of the blade-tip-exchange-type rotary cutting tool of the first embodiment to which the cutting insert of the first embodiment is attached.
- FIG. 10 is a perspective view of the tool body of the blade tip-exchange-type rotary cutting tool of the first embodiment shown in FIG.
- FIG. 11A shows a perspective view from a different angle of FIG.
- FIG. 11B is a cross-sectional view of a portion of the cutting edge replaceable rotary cutting tool of FIG. 9 taken along line XIB-XIB of FIG. 11A.
- FIG. 12A shows a front view of the tip end side of the cutting edge exchange type rotary cutting tool of FIG. 12B is a cross-sectional view of the cutting edge replaceable rotary cutting tool of FIG. 9 along the line XIIB-XIIB of FIG. 12A.
- FIG. 13A shows a bottom view of the tip side of the cutting edge exchange type rotary cutting tool of FIG.
- FIG. 13B is a cross-sectional view of a portion of the cutting edge replaceable rotary cutting tool of FIG. 9 taken along line XIIIB-XIIIB of FIG. 13A.
- FIG. 14 shows the perspective view of the blade-tip-exchange-type rotary cutting tool of 2nd Embodiment with which the cutting insert of 2nd Embodiment was mounted
- FIG. 15 shows the perspective view of the blade-tip-exchange-type rotary cutting tool of 3rd Embodiment with which the cutting insert of 3rd Embodiment was mounted
- FIG. 16 shows the perspective view of the blade-tip-exchange-type rotary cutting tool of 4th Embodiment with which the cutting insert of 4th Embodiment was mounted
- FIG. 17A shows a perspective view of a cutting insert of a comparative example.
- FIG. 17B shows a plan view of the cutting insert of FIG. 17A.
- FIG. 17C shows a front view of the cutting insert of FIG. 17A.
- FIG. 17D shows a bottom view of the cutting insert of FIG. 17A.
- FIG. 18 shows a comparative cutting edge type rotary cutting tool equipped with the cutting insert of FIG. 17A.
- FIG. 19 is a partial cross-sectional view taken along line XIX-XIX in the blade-tip-exchange-type rotary cutting tool of FIG.
- FIG. 20A shows a front view of the front end side of the cutting edge exchange type rotary cutting tool of FIG.
- FIG. 20A shows a front view of the front end side of the cutting edge exchange type rotary cutting tool of FIG.
- FIG. 20B is a cross-sectional view taken along the line XXB-XXB in the cutting edge exchange type rotary cutting tool of FIG. 20A.
- FIG. 21A shows a bottom view of the cutting edge exchange type rotary cutting tool of FIG.
- FIG. 21B is a partial cross-sectional view taken along the line XXIB-XXIB in the cutting edge exchange type rotary cutting tool of FIG. 21A.
- the cutting insert 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2A to 2D.
- the cutting insert 1 according to the first embodiment includes two opposed end surfaces 2 and 3 and a peripheral side surface 4 extending therebetween, and is basically configured from these.
- One of the end surfaces 2 and 3 is a first end surface, and the other is a second end surface.
- a through hole 5 having an opening is formed at the approximate center of each of the end surfaces 2 and 3.
- the through hole 5 is provided for inserting a tightening screw, and extends in the thickness direction of the cutting insert (direction in which the end faces 2 and 3 are connected).
- the thickness direction of the cutting insert is hereinafter referred to as the insert thickness direction, and is a direction parallel to the axis (first axis) 5a of the through hole 5.
- the insert thickness direction is a direction parallel to the axis (first axis) 5a of the through hole 5.
- one end surface 2 of the two end surfaces shown in FIG. 1 is referred to as an upper surface
- the other end surface 3 of the two end surfaces is referred to as a lower surface.
- the terms “upper” and “lower” are used according to the relative positional relationship between the upper surface 2 and the lower surface 3, but these terms are used or defined only for ease of explanation or understanding. It is not intended to limit the invention.
- the upper surface 2 has a substantially rectangular outline.
- the lower surface 3 also has a substantially rectangular outline, and has substantially the same shape as the upper surface 2.
- the main parts of the upper surface 2 and the lower surface 3 are configured to have rotational symmetry around the axis 5 a of the mounting hole 5.
- each of the upper and lower surfaces 2 and 3 has a two-fold rotational symmetry around the axis 5a.
- the upper surface 2 and the lower surface 3 have a rotational symmetry (two-fold symmetry) around the axis 5b or the axis 5c as a second axis that is defined to be orthogonal to the axis 5a and pass through the peripheral side surface. It is configured.
- the peripheral side surface 4 includes four side surface portions 4a, 4b and four corner surface portions 4c.
- the four side surface portions are composed of first side surface portions 4a and 4a and second side surface portions 4b and 4b, and the first side surface portion 4a is larger than the second side surface portion 4b.
- Each corner surface portion 4c connects the adjacent first side surface portion 4a and second side surface portion 4b.
- corner A, corner B, corner C, and corner D are defined as corner A, corner B, corner C, and corner D.
- the corners A to D are respectively associated with the corresponding corner surface portions 4c. Corner A and corner B are one set on the same diagonal, and corner C and corner D are one set on the same diagonal. Accordingly, the corners A to D are arranged in the order of corners A, C, B, and D in the clockwise direction in FIG. 2A.
- corners on two diagonal lines (not shown) that intersect are defined as corner E, corner F, corner G, and corner H.
- Corner E and corner F are one set on the same diagonal, and corner G and corner H are one set on the same diagonal. Accordingly, the corners E to H are arranged in the order of corners E, G, F, and H in the clockwise direction in FIG. 2C.
- the corner G of the lower surface 3 is positioned at a position facing the corner A on the upper surface 2 in the vertical direction (insert thickness direction), that is, on the back side of the corner A (that is, at a position adjacent to the axis 5 a direction).
- corner H on the lower surface 3 at a position facing the corner B on the upper surface 2 in the vertical direction, that is, on the back side of the corner B.
- corner E on the lower surface 3 at a position facing the corner C on the upper surface 2 in the vertical direction, that is, on the back side of the corner C.
- corner F on the lower surface 3 at a position facing the corner D on the upper surface 2 in the vertical direction, that is, on the back side of the corner D.
- cutting edges (cutting edge sections) 2A and 2B are formed in part of the intersecting ridge line portion between the upper surface 2 and the peripheral side surface 4.
- the corner cutting edge 6 is formed in the intersection ridgeline part located in the corner A.
- FIG. The corner cutting edge 6 is a cutting edge that curves and extends over a certain range including the apex of the corner A in a plan view of the upper surface 2.
- a main cutting edge 7 is formed at one end of the corner cutting edge 6 so as to be connected to the corner cutting edge 6.
- a secondary cutting edge 8 is formed at the other end of the corner cutting edge 6 so as to be connected to the corner cutting edge 6.
- a corner cutting edge 6, a main cutting edge 7, and a secondary cutting edge 8 are also formed in the corner B on the diagonal line of the corner A.
- the cutting edge sections 2A and 2B are formed only in a set of corners A and B on one of the two diagonal lines intersecting in the upper surface 2, that is, the corner cutting edge 6 is formed. Yes.
- the main cutting edge 7 is longer than the auxiliary cutting edge 8.
- the corner cutting edge 6, the main cutting edge 7 and the sub cutting edge 8 are continuous so as to constitute one cutting edge section, and each of the cutting edge sections 2A and 2B includes the corner cutting edge 6, the main cutting edge. 7 and the auxiliary cutting edge 8.
- the cutting edge sections 2 ⁇ / b> A and 2 ⁇ / b> B are arranged around the axis 5 a of the mounting hole 5 so as to have a rotational symmetry that is two times symmetrical.
- the corner cutting edge 6, the main cutting edge 7, and the auxiliary cutting edge 8 are formed so as to protrude in the insert thickness direction, that is, in the direction of the axis 5a, as compared with the seating surface 9 of the upper surface 2.
- the seating surface 9 means a contact surface that is formed on the upper surface 2 or the lower surface 3 and contacts a bottom wall surface 23 of an insert seat 22 provided on a tool body 21 described later.
- both the upper surface 2 and the lower surface 3 are used as mounting surfaces, so that such a seating surface 9 is provided as a contact portion on each of the upper surface 2 and the lower surface 3. Yes.
- the seating surfaces 9 on both sides mainly extend around the mounting hole 5.
- the corner cutting edge 6 and the cutting edge section are formed such that the portion corresponding to the apex of the corner cutting edge 6 in the plan view of the cutting insert (FIG. 2A) is farthest from the seating surface 9 in the first axis 5a direction.
- the portion corresponding to the apex of the corner cutting edge 6 in a plan view of the cutting insert is not shown, but is located on a line defined so as to pass through the first axis 5a so as to connect the corners A and B in FIG. 2A. However, it may deviate from this line.
- the portion corresponding to the apex of the corner cutting edge 6 may be on the bisector of the corner in plan view.
- the main cutting edge 7 or the sub-cutting edge 8 approaches the seating surface 9 in the first axis 5a direction, that is, as it moves away from the apex portion of the corner cutting edge 6 toward the main cutting edge 7 or the sub-cutting edge 8 side.
- the height of the cutting edge with respect to the surface 9 gradually decreases.
- the main cutting edge 7 and the auxiliary cutting edge 8 each terminate at a position away from the corner cutting edge 6 by a certain distance.
- the main cutting edge 7 and the auxiliary cutting edge 8 projecting in the insert thickness direction are eliminated from the corner cutting edge 6 at the position of a certain distance from the corner cutting edge 6 side to the main cutting edge 7 side or the auxiliary cutting edge 8 side.
- the seating surface 9 extends to In the present embodiment, on the upper surface 2, the main cutting edge 7 starts from one corner A or B and ends at the front end of the corner area of the other corner D or C. That is, the main cutting edge 7 protruding in the direction of the axis 5a with respect to the seating surface 9 is not in the middle between one corner A or B and the other corner D or C.
- the auxiliary cutting edge 8 starts from one corner A or B and ends at the front end of the corner area of the other corner C or D. That is, the auxiliary cutting edge 8 protruding in the direction of the axis 5a with respect to the seating surface 9 is not in the middle between one corner A or B and the other corner C or D.
- the seating surface 9 extends to between the cutting edge sections 2 ⁇ / b> A and 2 ⁇ / b> B and forms intersecting ridge portions 9 a and 9 b with the peripheral side surface 4.
- the intersection ridge line portions 9a and 9b are not configured as cutting edges, they may be referred to as non-cutting intersection ridge line portions.
- region of the upper surface 2 containing this non-cutting crossing ridgeline part is called noncutting crossing ridgeline area
- cutting edges (cutting blade sections) 3 ⁇ / b> A and 3 ⁇ / b> B are formed at a part of the intersecting ridge line portion between the lower surface 3 and the peripheral side surface 4.
- the two cutting edge sections 3 ⁇ / b> A and 3 ⁇ / b> B are arranged so as to have a two-fold rotational symmetry around the axis 5 ⁇ / b> A of the mounting hole 5.
- Each of the cutting edge sections 3A and 3B has the same configuration as that of each of the cutting edge sections 2A and 2B on the upper surface 2, and includes a corner cutting edge 6, a main cutting edge 7 and a sub cutting edge 8.
- the cutting edge sections 2A and 2B on the upper surface 2 are related to the cutting blade sections 3A and 3B on the lower surface 3 so as to have rotational symmetry about the axis 5B and about the axis 5C (two-fold symmetry). It has been.
- a corner cutting edge 6 is formed on the lower surface 3 at the intersecting ridge line portion located at the corner E.
- the corner cutting edge 6 is a cutting edge that curves and extends over a certain range from the apex of the corner E in a plan view of the cutting insert (FIG. 2C).
- a main cutting edge 7 is formed at one end of the corner cutting edge 6 so as to be connected to the corner cutting edge 6.
- a secondary cutting edge 8 is formed at the other end of the corner cutting edge 6 so as to be connected to the corner cutting edge 6.
- a corner cutting edge 6, a main cutting edge 7, and a sub-cutting edge 8 are formed in a corner F on a diagonal line of the corner E.
- the cutting edge section that is, the corner cutting edge 6 is formed only in the corner on one of the two diagonal lines intersecting each other on the lower surface 3.
- the main cutting edge 7 is longer than the sub cutting edge 8.
- the corner cutting edge 6, the main cutting edge 7, and the auxiliary cutting edge 8 on the lower surface 3 also project in the insert thickness direction with respect to the seating surface 9, similarly to the respective cutting edges on the upper surface 2.
- the main cutting edge 7 or the sub cutting edge 8 approaches the seating surface 9 in the direction of the axis 5a as it is separated from the apex portion of the corner cutting edge 6, and disappears at a constant distance from the corner cutting edge 6 (that is, the seating surface 9).
- the projecting portion from ceases to exist, and the height of the intersecting ridge line portion becomes the same as the seating surface 9).
- the main cutting edge 7 protruding in the direction of the axis 5 a with respect to the seating surface 9 disappears in the middle between one corner E or F and the other corner H or G.
- the sub-cutting edge 8 protruding in the direction of the axis 5a with respect to the surface 9 disappears midway between one corner E or F and the other corner G or H.
- the seating surface 9 extends to between the cutting edge sections 3 ⁇ / b> A and 3 ⁇ / b> B and forms intersecting ridge line portions (non-cutting intersecting ridge line portions) 9 c and 9 d with the peripheral side surface 4. Therefore, also on the lower surface 3, as with the upper surface 2, non-cutting intersecting ridge line regions 3 ⁇ / b> C and 3 ⁇ / b> D extending between adjacent cutting edge sections 3 ⁇ / b> A and 3 ⁇ / b> B extend.
- the corner on the lower surface 3 side adjacent to the corner A on the upper surface 2 via the peripheral side surface 4 in the insert thickness direction that is, the first axis 5A direction (that is, directly below the corner A on the upper surface 2 in FIG. 2A).
- the corner on the lower surface 3 side is a corner G in which no protruding cutting edge is formed.
- the corner B side of the upper surface 2 and the corner on the lower surface 3 side adjacent to the corner B of the upper surface 2 through the peripheral side surface 4 in the insert thickness direction (that is, the corner of the upper surface 2 in FIG. 2A).
- the corner on the lower surface 3 side immediately below B is a corner H in which a cutting edge protruding from the seating surface 9 is not formed.
- the lower surface 3 is in a direction intersecting with the diagonal line on the upper surface 2 in plan view. Corners E and F in which corner cutting edges 6 are formed are arranged on the extending diagonal line. Accordingly, the seating surface 9 of the lower surface 3 is continuous with the corner G of the lower surface 3 facing the corner A of the upper surface 2, and the seating surface 9 of the lower surface 3 is continuous with the corner H of the lower surface 3 facing the corner B of the upper surface 2. Then, the seating surface 9 of the upper surface 2 continues to the corner C of the upper surface 2 facing the corner E of the lower surface 3, and the seating surface 9 of the upper surface 2 continues to the corner D of the upper surface 2 facing the corner F of the lower surface 3. To do.
- the part from the main cutting edge of one cutting edge section of one of the upper and lower surfaces to the part of the auxiliary cutting edge through the corner cutting edge is on the back side thereof (in the direction of the axis 5a), and the non-cutting cross ridge line Has a region.
- a line ⁇ parallel to the axis 5a is drawn in FIG. 2B so as to pass through one point p of the main cutting edge 7 away from the corner cutting edge 6 in the cutting edge section 2B associated with the corner B.
- a line ⁇ parallel to the axis 5a is drawn in FIG. 2D so as to pass through one point q of the secondary cutting edge 8 away from the corner cutting edge 6 in the cutting edge section 2B.
- the line ⁇ passing through the point p reaches the end r of the non-cutting intersection ridgeline region 3D extending around the corner H of the lower surface 3 in FIG. 2B. Further, the line ⁇ passing through the point q reaches another end s of the non-cutting intersection ridgeline region 3D extending around the corner H of the lower surface 3 in FIG. 2D.
- the main cutting edge of the other cutting edge section on the other side of the upper and lower surfaces is disposed on the back side (in the direction of the axis 5a) of one non-cutting intersection ridge line region on one of the upper and lower surfaces.
- a continuous portion extends from a part to a part of the auxiliary cutting edge through the corner cutting edge.
- each cutting edge section is formed so as to protrude in the direction of the axis 5a, and in particular, is formed so as to protrude only in the direction of the axis 5a.
- a rake face for each cutting edge section is formed on the upper surface 2 and the lower surface 3, and a relief surface is formed on the peripheral side surface 4. Accordingly, as each cutting edge section protrudes in the direction of the axis 5a, the rake surfaces 2e and 3e respectively extend so as to be inclined with respect to a plane defined to be orthogonal to the axis 5a, and have a positive rake angle. It is formed so as to contribute to formation.
- the seating surface 9 is a flat surface
- the non-cutting intersection ridge line region is formed as a flat surface in the same manner as other portions of the seating surface 9.
- the seating surface 9 and / or the non-cutting intersection ridgeline region is not limited to being a flat surface, and may have various shapes.
- the insert seat described later is designed according to the shape of the seating surface and the non-cutting cross ridge area.
- the main cutting edge 7 is a part of the intersecting ridge line portion between each of the upper and lower surfaces 2 and 3 and the first side surface portion 4a of the peripheral side surface 4, specifically In particular, it extends along the majority part.
- the auxiliary cutting edge 8 extends along a part of the intersecting ridge line portion between each of the upper and lower surfaces 2, 3 and the second side surface portion 4 b of the peripheral side surface 4, specifically, about a majority portion.
- the non-cutting crossing ridgeline part 9a, 9b, 9c, 9d in one of the upper and lower surfaces 2, 3 is the main cutting edge 7 of the cutting edge sections 3A, 3B, 2A, 2B in the other of the upper and lower surfaces 2, 3, respectively.
- a cutting insert 10 according to a second embodiment of the present invention will be described with reference to FIGS. 3 and 4A to 4D. Since the cutting insert 10 of the second embodiment basically has the same configuration as the cutting insert 1 of the first embodiment, only different components will be described below. Moreover, the same term or reference number is used about the structure (element) of the cutting insert 10 similar to the cutting insert 1 of 1st Embodiment.
- the range of the cutting edge section formed on the intersecting ridge line portion between the upper surface 2 and the peripheral side surface 4 or on the intersecting ridge line portion between the lower surface 3 and the peripheral side surface 4 is the first. It is different from the cutting insert 1 of the embodiment. Specifically, in the upper surface 2 or the lower surface 3, the range in which the auxiliary cutting edge 8 connected to the corner cutting edge 6 of the corner A, B, E, or F is formed is different from the first embodiment. Yes.
- the auxiliary cutting edge 8 is continuously formed without interruption from one corner A, B, E or F to the front end of the other corner C, D, G or H.
- the auxiliary cutting edge 8 disappeared before reaching the corner area of the other corner C, D, G or H, but in this embodiment, the other corner C, D, G Alternatively, the auxiliary cutting edge 8 is formed so as to protrude to the end of the corner area of H.
- one non-cutting intersection ridge line is adjacent to only a part of the main cutting edge of the related cutting edge section and the corner cutting edge.
- attention is paid to one corner B on the upper surface 2.
- a line ⁇ parallel to the axis 5a is drawn in FIG. 4B so as to pass through one point p of the main cutting edge away from the corner cutting edge 6 in the cutting edge section 2B associated with the corner B.
- a line ⁇ parallel to the axis 5a is drawn in FIG. 4D so as to pass through the end point q on the secondary cutting edge side of the corner cutting edge 6.
- a corner cutting edge is formed from a part of the main cutting edge of the other cutting edge section of the other upper and lower surfaces on the back side (in the direction of the axis 5a) of one non-cutting intersection ridge line region of the upper and lower surfaces. The continuous part up to is extended.
- the sub-cutting edge 8 is substantially a crossed ridge line portion between each of the upper and lower surfaces 2 and 3 and the second side surface portion 4 b of the peripheral side surface 4. It extends throughout. Therefore, in the cutting insert 10, the non-cutting intersecting ridge line portions 9a, 9b, 9c, 9d and the non-cutting intersecting ridgeline region 2A are provided only on a part of the main cutting edge of each cutting edge section and the first axial back side of the corner cutting edge. , 2B, 3C, 3D.
- FIGS. 5 and 6A to 6D a cutting insert 11 according to a third embodiment of the present invention will be described with reference to FIGS. 5 and 6A to 6D. Since the cutting insert 11 of this embodiment also basically has the same configuration as the cutting insert 1 of the first embodiment, only different components will be described below. Moreover, the same term or reference number is used about the structure (element) of the cutting insert 11 similar to the cutting insert 1 of 1st Embodiment.
- the range of the cutting edge section formed on the intersecting ridge line portion between the upper surface 2 and the peripheral side surface 4 or on the intersecting ridge line between the lower surface 3 and the peripheral side surface 4 is the first implementation. It is different from the cutting insert 1 in the form. Specifically, in the upper surface 2 or the lower surface 3, cutting is performed at a point within a range where the main cutting edge 7 and the sub cutting edge 8 connected to the corner cutting edge 6 of the corner A, B, E or F are formed. The insert 11 is different from the cutting insert 1 of the first embodiment.
- the main cutting edge 7 is continuously formed without interruption from one corner A, B, E or F to the front end of the other corner D, C, H or G.
- the main cutting edge 7 protrudes to the end of the corner area of the other corner D, C, H or G.
- the auxiliary cutting edge 8 is continuously formed without interruption from one corner A, B, E or F to the front end of the other corner C, D, G or H corner area. That is, the auxiliary cutting edge 8 is formed so as to protrude to the end of the corner area of the other corner C, D, G or H.
- the portion where the cutting edge is not formed in the intersecting ridge line portion between the upper and lower surfaces 2, 3 and the peripheral side surface 4 is only the corner C and the corner D on the upper surface 2, and the lower surface. 3 is only corners G and H.
- one non-cutting intersection ridge is adjacent only to the corner cutting edge of the associated one cutting edge section.
- attention is paid to one corner B on the upper surface 2.
- a line ⁇ parallel to the axis 5a is drawn in FIG. 6B so as to pass through the end point p on the main cutting edge side of the corner cutting edge 6 in the cutting edge section 2B related to the corner B.
- a line ⁇ parallel to the axis 5a is drawn in FIG. 6D so as to pass through the end point q on the secondary cutting edge side of the corner cutting edge 6.
- the line ⁇ passing through the point p reaches the end r of the non-cutting intersection ridgeline region 3D extending around the corner H of the lower surface 3 in FIG.
- the corner cutting edge of the other one cutting edge section of the top and bottom surfaces extends on the back side (in the direction of the axis 5a) of one non-cutting cross ridge line region of one of the top and bottom surfaces.
- the main cutting edge 7 is substantially the intersection ridge line portion between each of the upper and lower surfaces 2, 3 and the first side surface portion 4 a of the peripheral side surface 4.
- the auxiliary cutting edge 8 extends over substantially the entire intersection ridge line portion between each of the upper and lower surfaces 2 and 3 and the second side surface portion 4 b of the peripheral side surface 4. Therefore, in the cutting insert 10, the non-cutting cross ridge line portions 9a, 9b, 9c, 9d and the non-cutting cross ridge line regions 2A, 2B, 3C, 3D are provided only on the back side in the first axial direction of the corner cutting edge of each cutting edge section. is there.
- a cutting insert 12 according to a fourth embodiment of the present invention will be described with reference to FIGS. 7 and 8A to 8D. Since the cutting insert 12 of the fourth embodiment also basically has the same configuration as the cutting insert 1 of the first embodiment, only different components will be described. Moreover, the same term or reference number is used about the structure (element) of the cutting insert 12 similar to the cutting insert 1 of 1st Embodiment.
- the range of the cutting edge section formed on the intersecting ridge line portion between the upper surface 2 and the peripheral side surface 4 or on the intersecting ridge line portion between the lower surface 3 and the peripheral side surface 4 is the first. It is different from the cutting insert of the embodiment. Specifically, the corner cutting edge 6B is also formed in the range where the secondary cutting edge 8 connected to the corner cutting edge 6 of the corner A, B, E or F is formed, and the corner C, D, G or H.
- the cutting insert 12 differs greatly from the cutting insert 1 of 1st Embodiment by the point currently formed.
- the auxiliary cutting edge 8 is continuously formed without interruption from one corner A, B, E or F to the end of the corner area of the other corner C, D, G or H.
- the auxiliary cutting edge 8 is formed so as to protrude to the end of the corner area of the other corner C, D, G or H. Furthermore, unlike the cutting insert 1 of 1st Embodiment, the corner cutting edge (2nd corner cutting edge) 6B which protrudes also in the corners C and D of the upper surface 2, and the corners G and H of the lower surface 3 is formed. .
- the corner cutting edges 6 and 6B are formed in all the corners of the upper and lower surfaces 2 and 3, and the portion where the cutting edge is not formed is the upper and lower surfaces 2 and 3. It is only a part of four intersecting ridge line portions (intersecting ridge line portions between the first side surface portion 4a and the upper and lower surfaces 2 and 3) in which the respective main cutting edges 7 are partially formed.
- one non-cutting intersection ridge line is adjacent to only a part of the main cutting edge of the related cutting edge section.
- attention is paid to one corner B on the upper surface 2.
- a line ⁇ parallel to the axis 5a is drawn in FIG. 8B to pass through one point p of the main cutting edge away from the corner cutting edge 6 in the cutting edge section 2B associated with the corner B.
- a line ⁇ parallel to the axis 5a is drawn in FIG. 8B so as to pass through an end point q on the main cutting edge side of the corner cutting edge 6 (a point closer to the corner cutting edge than point p).
- the line ⁇ passing through the point p reaches the end r of the non-cutting intersection ridgeline region 3D extending in the vicinity of the corner H of the lower surface 3 in FIG. 8B. Further, the line ⁇ passing through the point q reaches another end s of the non-cutting intersection ridgeline region 3D extending in the vicinity of the corner H of the lower surface 3 in FIG. 8B.
- the other cutting edge sections Therefore, in the cutting insert 12, a part of the main cutting edge of the other one cutting edge section of the upper and lower surfaces extends on the back side (in the direction of the axis 5a) of one non-cutting cross ridge line region of one of the upper and lower surfaces. .
- the main cutting edge 7 is formed at a part of the intersecting ridge line portion between each of the upper and lower surfaces 2 and 3 and the first side surface portion 4a of the peripheral side surface 4.
- the secondary cutting edge 8 extends substantially over the entire intersection ridgeline between each of the upper and lower surfaces 2, 3 and the second side surface portion 4 b of the peripheral side surface 4.
- each cutting edge section includes a second cutting edge 6B connected to the auxiliary cutting edge 8 in addition to the corner cutting edge 6 which is the first corner cutting edge.
- the non-cutting intersecting ridge line portions 9a, 9b, 9c, 9d and the non-cutting intersecting ridge line regions 2A, 2B, 3C are provided only on the back side in the first axial direction of a part of the main cutting edge of each cutting edge section. 3D.
- the shapes of the upper surface 2 and the lower surface 3 are not limited to a substantially square shape.
- the present invention can also be applied to cutting inserts having other substantially polygonal end faces such as a substantially triangular shape and a substantially pentagonal shape.
- the non-cutting intersection ridge line region is on the same plane as the seating surface 9.
- the non-cutting intersection ridgeline region is not limited to being on the same plane as the seating surface 9, and can have various shapes, and is preferably configured to function as a part of the seating surface 9. .
- the cutting insert of the present invention is preferably made from a hard material such as cemented carbide, cermet, ceramic, or ultra-high pressure sintered body containing diamond or cubic boron nitride, or those hard materials coated.
- a blade-tip-exchange-type rotary cutting tool 20 according to the first embodiment, in which the cutting insert 1 according to the first embodiment described above is detachably mounted, will be described with reference to FIGS. 9 to 13B.
- the cutting edge exchange type rotary cutting tool 27 of the second embodiment in which the cutting insert 10 of the second embodiment is detachably mounted is shown in FIG. 14, and the cutting insert 11 of the third embodiment is detachably mounted.
- the cutting edge exchange type rotary cutting tool 28 of the third embodiment is shown in FIG. 15, and the cutting edge exchange type rotary cutting tool 29 of the fourth embodiment in which the cutting insert 12 of the fourth embodiment is detachably attached is shown in FIG. 16. It is represented. *
- the cutting edge exchange type rotary cutting tool 20 is provided with a tool body 21 to which a plurality of cutting inserts 1 according to the first embodiment, specifically four, are mounted.
- the tool body 21 has a substantially cylindrical overall shape, and has a rotation axis 21C extending from the distal end side 21A to the proximal end side 21B, and a plurality of the distal end surfaces are cut out from the outer peripheral side.
- four insert seats 22 are provided.
- the insert seat 22 is basically composed of a substantially rectangular bottom wall surface 23 facing forward in the tool rotation direction K, and two side wall surfaces 24a and 24b arranged substantially perpendicular to the bottom wall surface 23. ing.
- a mounting screw hole 25 for inserting a fixing screw is provided in a substantially central portion of the bottom wall surface 23.
- the cutting insert is fixed to the insert seat using screws, but may be fixed by other mechanical means.
- the through hole 5 and the mounting screw hole 25 may be omitted. is there.
- the bottom edge protruding so as to protrude in the direction of the axis 5 a compared to the seating surface 9 of the upper surface 2 or the lower surface 3 does not contact the bottom wall surface 23 of the insert seat 22.
- a dull portion is provided at the peripheral edge of the wall surface 23 (see FIG. 10).
- a support abutting portion 23a having a shape suitable for the non-cutting crossing ridge line part and the non-cutting crossing ridge line region of the cutting insert 1 is provided at each of the front end side and the outer peripheral side edge of the bottom wall surface 23 of the tool body 21 and its vicinity. Is formed.
- the support abutting portion 23a may be configured to be clearly distinguishable from other portions of the bottom wall surface 23, but here, it is integrated with it.
- the insert seats 22 are provided at four locations determined so as to equally divide the outer periphery of the tool body 21 into four parts, but the present invention is not limited to this. That is, the number of the insert seats 22 may be less or more than four, such as one, two, three, five, and the like.
- the plurality of insert seats 22 may be arranged at positions determined so as to divide the outer periphery unevenly.
- a chip pocket 26 for discharging chips is provided in front of each insert seat 22 in the tool rotation direction K.
- the cutting insert 1 of the first embodiment is disposed on the insert seat 22 so that either the upper surface 2 or the lower surface 3 thereof faces the bottom wall surface 23 of the insert seat 22. That is, when the cutting edge formed on the upper surface 2 is used for cutting, the cutting insert is disposed so that the lower surface 3 faces the bottom wall surface 23. On the other hand, when the cutting edge formed on the lower surface 3 is used for cutting, the cutting insert is arranged so that the upper surface 2 faces the bottom wall surface 23. Since the insert seat 22 employs a structure in which the protruding cutting edge does not come into contact with the insert seat 22 as described above, there is a possibility that unused cutting edges, particularly unused cutting edges, may be damaged by the contact of the insert seat 22. Absent.
- the bottom wall surface 23 of the insert seat 22 is the cutting insert of each embodiment. It has a shape that matches the seating surface 9 of 10, 11, 12. Even in the rotary cutting tools of the second to fourth embodiments, the non-cutting crossed ridge line part and the noncutting crossing of the cutting insert are provided at the front edge side and / or the outer peripheral side of the bottom wall surface 23 of the tool body 21 and in the vicinity thereof. A support contact portion 23a having a shape suitable for the ridge line region is formed.
- the support contact portion 23a may be configured to be clearly distinguishable from other portions of the bottom wall surface 23.
- the insert seats of the rotary cutting tools according to the second to fourth embodiments also include a relief portion to prevent interference between the unused cutting edge and the insert seat and protect it. Therefore, there is no possibility that the unused cutting edge is damaged by collision or interference with the insert seat.
- the cutting insert 100 is basically composed of an upper surface 101 and a lower surface 102 each having a substantially rectangular shape, and a peripheral side surface 103 connecting them.
- a corner cutting edge 104 is formed at each corner of a set of corners
- a main cutting edge 105 is formed at a longitudinal ridge line portion extending from the corner, and extends from the corner in a direction different from the longitudinal ridge line portion.
- a secondary cutting edge 106 is formed on the existing short ridge line portion.
- a corner cutting edge 104, a main cutting edge 105, and a sub cutting edge 106 are formed on the lower surface 102.
- the four corner cutting edges are arranged on the upper and lower surfaces so that the diagonal line connecting the corner cutting edges 104 on the diagonal of the lower surface 102 intersects the diagonal line connecting the corner cutting edges 104 on the upper surface 101. Is arranged. Therefore, in this cutting insert 100, four corners, each of which can be used for cutting, are arranged so that the upper corner cutting edge and the lower corner cutting edge do not line up in the thickness direction.
- the seating surface 107 is formed in the vicinity of the center portion of each of the upper surface 101 and the lower surface 102 in contact with the bottom wall surface of the insert seat. And is generally separated from the edge of the surface. Therefore, in this cutting insert 100, the seating surface 107 that comes into contact with the bottom wall surface of the insert seat is provided inside the insert away from the intersecting ridge line portion between the upper surface 101 or the lower surface 102 and the peripheral side surface 103.
- the insert 100 is supported by the bottom wall surface of the insert seat only at the central portion around the upper and lower mounting holes. Accordingly, as shown in each of the cross-sectional views of FIGS.
- the cutting insert is supported by the bottom wall surface of the insert seat only at the center portion around the mounting hole of the cutting insert.
- problems such as chatter and chipping due to the swinging of the cutting edge may occur.
- the cutting inserts 1, 10, 11, and 12 have the corner cutting edge 6 and the main cutting edge 7 formed on the intersecting ridge line portion of one surface of the upper surface 2 or the lower surface 3 as described above. At least one portion where the cutting edge is not formed, that is, a non-cutting cross ridge line portion is provided in the cross ridge line portion of the other surface adjacent to either or both in the insert thickness direction. This non-cutting intersection ridge line portion is formed between the seating surface 9 and the peripheral side surface 4.
- the non-cutting cross ridge line region immediately below the main cutting edge 7 is firmly supported by the support contact portion 23a of the bottom wall surface 23 of the insert seat 22. Is shown.
- the seating surface is wide enough so that the corner G and the surrounding non-cutting crossing ridge line area directly cover the cutting edge sections (corner cutting edge 6, main cutting edge 7, and auxiliary cutting edge 8) involved in cutting. Since it is formed integrally with 9, it is possible to more reliably support the entire cutting edge from the back side.
- the non-cutting cross ridge line region on the back side of the insert corresponding to almost the entire area of the corner cutting edge 6, the main cutting edge 7, and the auxiliary cutting edge 8 to which cutting force is applied is the bottom wall surface 23 of the insert seat 22. Since the contact portion or the contact surface is in contact, the above effect can be achieved to the maximum.
- the first side surface portion 4 a and the lower surface connected to the entire area of the corner G and one end thereof immediately below the corner A. 3 is a non-cutting cross ridge line region. That is, this 2nd Embodiment employ
- the cutting force that receives a relatively strong cutting force is the corner cutting edge 6 where stress tends to concentrate.
- the main cutting edge 7. Therefore, it is possible to obtain the effect of sufficiently suppressing chattering and chipping of the cutting insert 10 even by adopting a configuration in which the corner cutting edge 6 and the main cutting edge 7 are intensively supported.
- the cutting insert according to the second embodiment has an advantage that the cutting edge 7 can be made longer as compared with the cutting insert according to the first embodiment, so that more efficient machining can be performed.
- the corner A when the corner A is involved in cutting, a contact surface portion in which only the corner G region is in contact with the insert seat, that is, the non-contact surface portion, that is, the non-contact area. It is the cutting ridge line area. Therefore, the main cutting edge 7 and the sub-cutting edge 8 extend over the entire length of the edge portions of the corresponding side surface portions 4a and 4b, and are continuously formed from the corner A to the corners D and C.
- the corner cutting edge 6 is located at a tip portion connected to both the main cutting edge 7 and the sub cutting edge 8, there is a seating surface including a non-cutting cross ridge line portion, that is, a non-cutting cross ridge line area, immediately below the corner cutting edge 6.
- a seating surface including a non-cutting cross ridge line portion that is, a non-cutting cross ridge line area, immediately below the corner cutting edge 6.
- the amount of overhang from the seating surface of the used cutting edge is greatly suppressed in both directions of the main cutting edge 7 and the auxiliary cutting edge 8, and the effect of sufficiently suppressing chatter and chipping of the cutting insert 11 by itself alone. It is possible to obtain Furthermore, in the cutting insert 11 of this embodiment, since the main cutting edge 6 and the sub cutting edge 7 each extend along the whole edge part of a side part, from the cutting inserts 1 and 10 of 1st and 2nd embodiment. There is also an advantage that highly efficient processing can be performed.
- the first side surface portion 4 a connected to one end of the corner G immediately below it. Only a part of the edge portion, that is, the intersecting ridge line portion is a non-cutting intersecting ridge line portion. That is, this 4th Embodiment employ
- the corner cutting edge 6 and the main cutting edge 7 receive the cutting force strongly, there is a non-cutting cross ridge line region only under the main cutting edge 7, that is, there is a support contact surface. It is possible to appropriately receive most of the cutting force. Therefore, it is possible to obtain the effect of sufficiently suppressing chattering and chipping of the cutting insert 12.
- the secondary cutting edge 8 extends over the whole edge part of the 2nd side part 4b, the advantage that a highly efficient process can be performed rather than the cutting insert 1 of 1st Embodiment. There is.
- the cutting edge is formed so as to protrude in the insert thickness direction from the seating surface 9 as a reference. Therefore, a large rake angle can be easily secured, and as a result, the cutting force can be greatly reduced. Further, since there are no wall portions on the upper and lower surfaces where the chips are strongly restrained, the chips can be discharged smoothly and the cutting force can be further reduced. By greatly reducing the cutting force in this way, chattering and chipping of the cutting insert are more suitably suppressed.
- the chatter suppressing effect obtained by forming the cutting blade so as to protrude from the seating surface 9 and the chatter suppressing effect obtained by supporting the cutting blade at least partially directly below By acting synergistically, it is possible to exert a significantly effective chatter and chipping suppressing effect as compared with the comparative example.
- the cutting insert of the present invention is not limited to a rotary cutting tool (milling or end mill) for turning, but can also be used for a cutting tool (turning tool) for turning or a rotary cutting tool (drill) for drilling. is there. More generally speaking, the present invention can be applied to any application as long as the upper and lower surfaces are cutting inserts used for cutting.
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Abstract
Description
Claims (10)
- 各々が略多角形形状の輪郭を有する2つの対向する第1及び第2端面(2、3)と、
前記第1及び第2端面(2、3)との間に延在する周側面(4)と、
前記第1端面(2)及び前記第2端面(3)の各々と前記周側面(4)との間の交差稜線部に沿って形成された複数の切れ刃セクションであって、各切れ刃セクションは、コーナ部分に設けられたコーナ切れ刃(6)と、該コーナ切れ刃(6)の一方端と接続する主切れ刃(7)と、該コーナ切れ刃(6)の他方端と接続する副切れ刃(8)とを含む、複数の切れ刃セクション(2A、2B、3A、3B)と
を備え、
前記第1端面及び前記第2端面の各々において、少なくとも2つの切れ刃セクション及び着座面(9)が形成され、各切れ刃セクションは隣接する端面にすくい面(2e、3e)を有し、各切れ刃セクションの少なくとも一部は、インサート厚さ方向において少なくとも突出し、
前記第1端面及び前記第2端面の一方における隣り合う切れ刃セクションの間に延在する非切削交差稜線領域(2C、2D、3C、3D)は、前記第1端面及び前記第2端面のもう一方における前記切れ刃セクションの前記コーナ切れ刃及び前記主切れ刃からなる部分の少なくとも一部と、前記周側面(4)を介して隣り合う、
切削インサート(1,10,11,12)。 - 前記第1端面及び前記第2端面の一方における前記非切削交差稜線領域(2C、2D、3C、3D)は、前記第1端面及び前記第2端面のもう一方における前記切れ刃セクションの前記コーナ切れ刃及び前記主切れ刃からなる部分の少なくとも一部の前記インサート厚さ方向裏側に延在する、請求項1に記載の切削インサート(1,10,11,12)。
- 前記第1端面及び前記第2端面の各々において、前記着座面(9)は前記隣り合う切れ刃セクションの間にまで延在し、前記非切削交差稜線領域と一体化している、請求項1又は2に記載の切削インサート(1,10,11,12)。
- 前記複数の切れ刃セクションは、前記第1端面及び前記第2端面を貫通するように前記インサート厚さ方向に延びるように定められる第1軸線(5a)に関して回転対称性を有するように配置形成されていて、かつ、該第1軸線(5a)に直交すると共に前記周側面(4)を通過するように定められる第2軸線(5b、5c)に関して回転対称性を有するように配置形成されている、請求項1から3のいずれか一項に記載の切削インサート。
- 前記第1端面及び前記第2端面の一方における前記非切削交差稜線領域は、前記第1端面及び前記第2端面のもう一方における前記切れ刃セクションの前記主切れ刃の一部から前記コーナ切れ刃を介して前記副切れ刃の一部までの部分と前記インサート厚さ方向において隣り合う、請求項1から4のいずれか一項に記載の切削インサート(1)。
- 前記第1端面及び前記第2端面の一方における前記非切削交差稜線領域は、前記第1端面及び前記第2端面のもう一方における前記切れ刃セクションの前記主切れ刃の一部及び前記コーナ切れ刃と前記インサート厚さ方向において隣り合う、請求項1から4のいずれか一項に記載の切削インサート(10)。
- 前記第1端面及び前記第2端面の一方における前記非切削交差稜線領域は、前記第1端面及び前記第2端面のもう一方における前記切れ刃セクションの前記コーナ切れ刃のみと前記インサート厚さ方向において隣り合う、請求項1から4のいずれか一項に記載の切削インサート(11)。
- 前記切れ刃セクションは、さらに、前記コーナ切れ刃(6)と異なる第2コーナ切れ刃であって前記副切れ刃に接続する第2コーナ切れ刃(6B)を含み、
前記第1端面及び前記第2端面の一方における前記非切削交差稜線領域は、前記第1端面及び前記第2端面のもう一方における前記切れ刃セクションの前記主切れ刃の一部のみと前記インサート厚さ方向において隣り合う、請求項1から4のいずれか一項に記載の切削インサート(12)。 - 少なくとも1つのインサート座(22)が形成された工具ボデー(21)を備え、該インサート座(22)に切削インサートが着脱自在に装着される、刃先交換式切削工具(20,27,28,29)において、
前記切削インサートは、請求項1から8のいずれか一項に記載された切削インサート(1,10,11,12)であり、
前記インサート座は、前記切削インサートの前記着座面に当接する底壁面を有し、
前記第1端面及び前記第2端面の一方における1つの前記切れ刃セクションを使用するように前記切削インサートを前記インサート座に取り付けるとき、該切れ刃セクションに隣り合う、該切削インサートの前記第1端面及び前記第2端面のもう一方における非切削交差稜線領域は該インサート座により支持される、
刃先交換式切削工具(20,27,28,29)。 - 前記インサート座の前記底壁面は、前記切削インサートの前記非切削交差稜線領域に当接可能な部分(23a)を含む、請求項9に記載の刃先交換式切削工具。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US14/777,309 US9776259B2 (en) | 2013-03-19 | 2014-03-18 | Cutting insert and indexable cutting tool |
EP14769981.3A EP2977136B1 (en) | 2013-03-19 | 2014-03-18 | Cutting insert, and cutting tool with replaceable cutting edge |
JP2015506811A JP5939355B2 (ja) | 2013-03-19 | 2014-03-18 | 切削インサート及び刃先交換式切削工具 |
CN201480016926.8A CN105188999B (zh) | 2013-03-19 | 2014-03-18 | 切削刀片和刀尖更换式切削工具 |
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JP2013-056187 | 2013-03-19 | ||
JP2013056187 | 2013-03-19 |
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WO2014148515A1 true WO2014148515A1 (ja) | 2014-09-25 |
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PCT/JP2014/057414 WO2014148515A1 (ja) | 2013-03-19 | 2014-03-18 | 切削インサート及び刃先交換式切削工具 |
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US (1) | US9776259B2 (ja) |
EP (1) | EP2977136B1 (ja) |
JP (1) | JP5939355B2 (ja) |
CN (1) | CN105188999B (ja) |
WO (1) | WO2014148515A1 (ja) |
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JP2015093342A (ja) * | 2013-11-11 | 2015-05-18 | 三菱マテリアル株式会社 | 切削インサートおよび刃先交換式穴加工工具 |
US11298749B2 (en) | 2018-03-15 | 2022-04-12 | Tungaloy Corporation | Cutting insert, holder, and cutting tool that includes cutting insert |
JP7530373B2 (ja) | 2019-03-27 | 2024-08-07 | イスカル リミテッド | 対角対向隆起コーナと対角対向沈下コーナとを有する両側式切削インサート、及び回転切削工具 |
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EP2774705B1 (en) | 2011-10-31 | 2020-12-23 | Kyocera Corporation | Cutting insert, cutting tool, and method for manufacturing cutting workpiece using same |
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KR101407168B1 (ko) * | 2012-08-07 | 2014-06-12 | 대구텍 유한회사 | 절삭 인서트 및 이를 포함하는 절삭 공구 |
CN105764640B (zh) * | 2013-09-11 | 2017-09-15 | 三菱日立工具技术株式会社 | 刀头更换式旋转切削工具 |
AT14072U1 (de) * | 2014-02-04 | 2015-04-15 | Ceratizit Luxembourg S R L | Doppelseitiger Frässchneideinsatz und Fräswerkzeug |
CN106457423B (zh) * | 2014-06-24 | 2018-09-07 | 住友电工硬质合金株式会社 | 切削刀具和刀具本体 |
US10239134B2 (en) * | 2015-05-19 | 2019-03-26 | Tungaloy Corporation | Tool body and cutting tool |
JP1568740S (ja) * | 2016-09-09 | 2017-02-06 | ||
EP3421163A1 (de) * | 2017-06-27 | 2019-01-02 | HILTI Aktiengesellschaft | Bohrer für die meisselnde bearbeitung von gestein |
EP3542936A1 (en) * | 2018-03-22 | 2019-09-25 | AB Sandvik Coromant | A cutting insert for a shoulder milling tool |
USD939599S1 (en) * | 2019-02-07 | 2021-12-28 | Vermeer Manufacturing Company | Cutter |
US11969807B2 (en) * | 2020-01-15 | 2024-04-30 | Taegutec Ltd. | Insert and cutting tool assembly comprising same |
CN111545840B (zh) * | 2020-05-21 | 2021-07-09 | 株洲华锐精密工具股份有限公司 | 切削刀片 |
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JP7530373B2 (ja) | 2019-03-27 | 2024-08-07 | イスカル リミテッド | 対角対向隆起コーナと対角対向沈下コーナとを有する両側式切削インサート、及び回転切削工具 |
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Publication number | Publication date |
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US9776259B2 (en) | 2017-10-03 |
EP2977136B1 (en) | 2022-05-04 |
EP2977136A4 (en) | 2016-11-23 |
JP5939355B2 (ja) | 2016-06-22 |
JPWO2014148515A1 (ja) | 2017-02-16 |
US20160023285A1 (en) | 2016-01-28 |
CN105188999A (zh) | 2015-12-23 |
CN105188999B (zh) | 2017-12-01 |
EP2977136A1 (en) | 2016-01-27 |
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