WO2015182562A1 - 切削インサート、ボデーおよび切削工具 - Google Patents
切削インサート、ボデーおよび切削工具 Download PDFInfo
- Publication number
- WO2015182562A1 WO2015182562A1 PCT/JP2015/064957 JP2015064957W WO2015182562A1 WO 2015182562 A1 WO2015182562 A1 WO 2015182562A1 JP 2015064957 W JP2015064957 W JP 2015064957W WO 2015182562 A1 WO2015182562 A1 WO 2015182562A1
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- WIPO (PCT)
- Prior art keywords
- cutting edge
- face
- insert
- corner
- cutting
- 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
- B23C5/06—Face-milling cutters, i.e. having only or primarily a substantially flat cutting surface
-
- 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
-
- 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
- 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
- B23C2200/205—Discontinuous cutting edges
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/28—Angles
- B23C2200/286—Positive cutting angles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/36—Other features of the milling insert not covered by B23C2200/04 - B23C2200/32
- B23C2200/365—Lands, i.e. the outer peripheral section of rake faces
- B23C2200/366—Variable
-
- 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 used for a cutting tool, and particularly to a cutting insert used for a turning tool.
- the present invention also relates to a body on which the cutting insert is detachably mounted and a cutting tool including them.
- Patent Document 1 Conventionally, as a cutting insert for a turning tool, for example, there is one shown in Patent Document 1.
- the cutting insert of Patent Document 1 includes two opposing end surfaces, a peripheral side surface extending between the two end surfaces, and a plurality of cutting edges extending at the intersection ridge line portion between each of the two end surfaces and the peripheral side surface. Prepare. Each cutting edge is different from a corner cutting edge extending to a corner with an associated end face, a main cutting edge extending from the corner cutting edge to an adjacent corner, and a main cutting edge of the corner cutting edge A secondary cutting edge extending from the side.
- the main cutting edge is inclined so as to approach the intermediate surface as the distance from the adjacent corner cutting edge increases.
- the working cutting edge extends to the tool front end side and the tool outer peripheral side, and one end face related to the working cutting edge is rotated by the tool. It becomes a rake face facing the direction front.
- the action corner cutting edge is located at the foremost position in the tool rotation direction among the action cutting edges, the action main cutting edge extends to the outer peripheral side of the tool body, and the action sub cutting edge is located on the tool tip side. Extend.
- the working cutting edge is sequentially cut into the workpiece from the working corner cutting edge formed in the corner.
- the resistance applied instantaneously to the entire cutting edge is greater than when the entire working corner cutting edge and the working main cutting edge are cut simultaneously.
- the working cutting edge sequentially cuts into the work piece from the working corner cutting edge as described above, the load applied at the moment when the working cutting edge is cut into the work piece is concentrated on the working corner cutting edge. Part of the impact applied to the working corner cutting edge is converted to heat, and the generated heat is accumulated around the cutting edge. When heat accumulates around the edge of the blade, crater wear due to scraping of chips tends to be formed on the rake face.
- the working corner cutting edge is intermittently cooled due to intermittent cutting. As the cutting edge temperature is rapidly changed by heating and cooling, the working corner cutting edge repeatedly expands and contracts, and therefore fatigue failure is likely to occur.
- the present invention was created in view of the above circumstances, and one object thereof is to suppress the deterioration of the cutting insert due to the heat of the working cutting edge.
- the main cutting edge When the cutting insert is viewed from the side, the main cutting edge includes an inclined part that is inclined from the corner cutting edge toward the second end surface, The portion of the rake face along the inclined portion is inclined more toward the second end face as the position is closer to the corner in the direction along the intersecting ridge line portion between the first end face and the side face. Formed, A cutting insert is provided.
- a rake face is formed along the cutting edge on the first end face, and the rake face is inclined to the second end face side as the distance from the cutting edge increases.
- the main cutting edge includes an inclined portion that is inclined from the corner cutting edge toward the second end surface, and the rake face portion along the inclined portion includes the first end surface and the side surface.
- the angle closer to the corner is formed such that the angle inclined toward the second end face is larger. That is, the rake angle of the rake face portion along the inclined portion of the main cutting edge increases toward the positive side as the position is closer to the corner in the direction along the side ridge portion of the first end face.
- the impact applied to the action corner cutting edge when the action cutting edge is cut into the workpiece can be alleviated, and heat can be hardly accumulated on the cutting edge.
- heat can be hardly accumulated on the cutting edge.
- the main cutting edge is concavely curved toward the second end surface.
- the main cutting edge when viewed from a direction facing the first end surface, includes a first main cutting edge portion, and a second main cutting edge portion forming an obtuse internal angle with the first main cutting edge portion.
- a land is formed between the cutting edge and the rake face, and the width of the first land extending between the first main cutting edge and the rake face in the land is The closer to the corner, the better.
- the width of the second land extending between the second main cutting edge portion and the rake face becomes wider as approaching the corner, and the enlargement ratio of the width of the first land is the second land. Is larger than the width expansion rate.
- the first main cutting edge portion is shorter than the second main cutting edge portion.
- the cutting edge includes a secondary cutting edge connected to the opposite side of the corner cutting edge from the main cutting edge.
- the inner angle of the corner when viewed from the direction facing the first end face, may be smaller than the inner angle between the first main cutting edge portion and the second main cutting edge portion.
- n cutting edges extending to the intersecting ridge line portion of the first end surface and the side surface
- n times rotationally symmetric Around the central axis of the through hole is arranged n times rotationally symmetric (where n is an integer of 2 or more), and the cutting insert is rotationally symmetric by 180 ° with respect to an axis perpendicular to the central axis of the through hole It is.
- the cutting insert has a first inclined surface on the side surface, a position that is disposed closer to the second end surface than the first inclined surface, and is separated from the first inclined surface in the circumferential direction of the cutting insert.
- a second inclined surface is formed. The first inclined surface is inclined so that the portion closer to the second end surface is directed toward the inside of the cutting insert, and the second inclined surface is positioned inside the cutting insert as being closer to the first end surface. It is good to incline like this.
- the present invention also exists in a body on which the cutting insert is detachably mounted.
- the body includes an insert mounting seat for mounting the cutting insert, the insert mounting seat includes a first side wall surface, and the first side wall surface is disposed on a side surface of the cutting insert.
- a body including a convex portion that comes into contact with the formed second inclined surface.
- the outer shape of the body is preferably substantially cylindrical.
- the insert mounting seat further includes a second side wall surface located on the outer peripheral side of the body with respect to the first side wall surface, and the second side wall surface is formed on a side surface of the cutting insert. It is good to provide the convex part contact
- a cutting tool including the cutting insert and a body on which the cutting insert is detachably mounted.
- FIG. 1 is a perspective view of a cutting insert according to an embodiment of the present invention.
- FIG. 2 is a perspective view of the cutting insert of FIG. 1 viewed from another angle.
- FIG. 3 is a top view of the cutting insert of FIG. 4A is a cross-sectional view of the cutting insert of FIG. 1, and is a cross-sectional view taken along the line IVA-IVA of FIG. 4B is a cross-sectional view of the cutting insert of FIG. 1, and is a cross-sectional view taken along the line IVB-IVB of FIG.
- FIG. 5 is an enlarged top view schematically showing a part of the cutting edge of the cutting insert of FIG. 1, and is an enlarged view of a portion corresponding to the V region of FIG. FIG.
- FIG. 6 is a side view of the cutting insert of FIG.
- FIG. 7 is a front view of a cutting tool according to an embodiment of the present invention on which the cutting insert of FIG. 1 is mounted.
- FIG. 8 is a view of the cutting tool of FIG. 7 as seen from another direction.
- FIG. 9 is a bottom view of the cutting tool of FIG.
- FIG. 10 is an enlarged view of a region X in FIG.
- FIG. 11 is an enlarged perspective view showing an insert mounting seat of the cutting tool of FIG.
- FIG. 12 is a schematic diagram for explaining the outflow of chips by the working cutting edge in the cutting tool of FIG.
- the cutting insert 1 has two opposing end surfaces 11, 21 and a peripheral side surface (hereinafter referred to as a side surface) 31 extending between them, and a plurality of cutting edges 11E extending to intersecting ridge lines between the end surfaces and the side surfaces. , 21E.
- the shape of the first end surface 11 of the two end surfaces of the cutting insert 1 is a shape including eight corners and eight side ridges connecting adjacent corners, and is an octagon. The shape can be approximated to.
- the second end face 21 has the same shape as the first end face 11.
- the first end surface 11 is connected to the second end surface 21 via the side surface 31.
- a concave portion 32 is formed in each of the eight side portions constituting the side surface 31.
- the eight side portions are connected in the circumferential direction around the axis A1 extending so as to penetrate the first and second end faces of the cutting insert 1, and the eight concave portions 32 are also connected in the circumferential direction.
- the first end surface 11 is referred to as “upper surface 11”
- the second end surface 21 is referred to as “lower surface 21” for convenience. However, this is not intended to limit the orientation of the cutting insert.
- a through-hole 14 that penetrates each surface in a perpendicular direction is formed.
- a fastener such as a screw is inserted into the through hole 14 and the cutting insert 1 is fixed to an insert mounting seat formed on the body.
- the cutting insert 1 has eight axes with respect to the central axis of the through hole 14 (that is, the axis A1 defined so as to penetrate the upper and lower surfaces 11 and 21). It is formed with rotational symmetry.
- the plurality of cutting edges 11 ⁇ / b> E extending to the intersecting ridge line portion between the upper surface 11 and the side surface 31 are disposed rotationally symmetrically with respect to the central axis of the through hole 14.
- the cutting insert 1 has the same shape even when turned upside down. That is, the cutting insert 1 has a 180 ° rotationally symmetric shape with respect to a second axis A2 (shown as a second axis as an example in FIG. 3) passing through the side surface 31 perpendicular to the central axis A1 of the through hole 14. It has become.
- the plurality of cutting edges 11E extending to the intersecting ridge line portion between the upper surface 11 and the side surface 31 are 180 with respect to the plurality of cutting edges 21E extending to the intersecting ridge line portion between the lower surface 21 and the side surface 31 and the second axis. It is rotationally symmetric and the cutting edges 11E and 21E have the same configuration. Therefore, hereinafter, only items related to the upper surface 11 will be described, and description of items related to the lower surface 21 will be omitted. That is, the geometrical features provided on the upper surface 11 are also provided on the lower surface 21 in the same manner, and a description thereof will be omitted.
- the upper surface 11 has eight cutting edges 11E extending continuously along the edge, that is, the side ridge. Each cutting edge 11E is associated with one corner 11C on the upper surface 11.
- a land 12 and a rake face 13 extend on the upper surface 11 from the cutting edge 11E side to the through hole 14 side.
- the land 12 is inclined so as to approach the lower surface 21 as it moves away from the cutting edge 11E (in a direction orthogonal to the cutting edge in FIG. 3), and in short, has a positive land angle. That is, when the virtual plane passing through the side surface 31 is defined as the intermediate surface M so as to bisect the cutting insert 1 perpendicular to the central axis of the through hole 14, the land 12 is adjacent to the cutting edge 11E, and the cutting edge It inclines so that it may approach the intermediate surface M as it leaves
- the rake face 13 is adjacent to the land 12 and is inclined so as to approach the lower surface 21 as it moves away from the cutting edge 11E (in a direction perpendicular to the cutting edge in FIG. 3), and has a positive rake angle. That is, the rake face 13 is inclined so as to approach the intermediate face M as it is separated from the cutting edge 11E. And the upper surface 11 is provided with the inclined surface 16 which connects these between the scoop surface 13 and the contact surface 15 extended around the through-hole 14.
- the abutting surface 15 is a surface that can abut on an insert mounting seat formed on the body, that is, a seating surface. However, in this embodiment, the contact surface 15 extends so as to be orthogonal to the central axis of the through hole 14.
- the rake face 13 is formed so that the angle inclined toward the lower face 21 is larger than that of the adjacent land 12. Furthermore, the rake face 13 is formed so that the angle inclined toward the lower surface 21 side becomes larger as the position is closer to the corner 11C in the direction along the side ridge portion (intersection ridge line portion between the upper surface 11 and the side surface 31) of the upper surface 11. More specifically, in this embodiment, the inclination angle with respect to the intermediate surface M of the rake face in the direction orthogonal to the cutting edge in FIG. 3 is the maximum in the vicinity of the corner 11C, and the place farthest from the corner 11C ( It means that it is minimum in the vicinity of the center between adjacent corners 11C). That is, in the first imaginary plane (that is, for example, in FIGS.
- FIG. 4A is a partial cross-sectional view of the cutting insert 1 along an IVA-IVA cutting line perpendicular to the cutting edge 11E in FIG.
- FIG. 4B is a partial cross-sectional view of the cutting insert 1 along the IVB-IVB cutting line orthogonal to the cutting edge 11E in FIG.
- FIG. 4A is a partial cross-sectional view of the cutting insert 1 along an IVA-IVA cutting line perpendicular to the cutting edge 11E in FIG.
- FIG. 4B is a partial cross-sectional view of the cutting insert 1 along the IVB-IVB cutting line orthogonal to the cutting edge 11E in FIG.
- the IVA-IVA cutting line is located in the vicinity of one corner 11C ′, and the IVB-IVB cutting line is substantially in the middle of the side ridge 11S between the adjacent corners 11C. It is located and is further away from the corner 11C ′ than the IVA-IVA cutting line.
- the angle ⁇ of the rake face 13 with respect to the virtual plane S ⁇ b> 1 determined so as to be orthogonal to the central axis of the through hole 14 is 16 °.
- the angle ⁇ of the rake face 13 with respect to the virtual plane S2 determined to be orthogonal to the central axis of the through hole 14 is 13 °.
- the rake face 13 is formed so that the inclination angle gradually increases as it approaches the corner 11C ′ from a location far from the corner 11C ′.
- the IVA-IVA cutting line intersects with a first main cutting edge 42 of a main cutting edge 41a described later, and the IVB-IVB cutting line intersects with a second main cutting edge 43 of the main cutting edge 41a.
- FIGS. 4A and 4B show not only the surface 13 that is easy to land 12 but also the connecting inclined surface 16.
- the inclination angle of the connecting inclined surface 16 with respect to the virtual plane determined to be orthogonal to the central axis of the through hole 14 is larger than the inclination angle of the rake face 13.
- the reference for the inclination angle of the rake face 13 and the inclination angle of the connecting inclined face 16 in the direction orthogonal to the cutting edge is determined so as to be orthogonal to the central axis of the through hole 14 and FIG. 4A or FIG.
- these virtual planes S 1 and S 2 are parallel to the contact surface 11 on the upper surface 11, the contact surface 15 on the lower surface 21 side, and the intermediate surface M. Therefore, hereinafter, the inclination angle of the rake face 13 in the direction orthogonal to the cutting edge in FIG. 3 may be referred to as an inclination angle with respect to the intermediate face of the rake face.
- the land 12 may be described as an inclination angle with respect to the intermediate surface of the land.
- Each cutting edge 11E is formed in the corner 11C and the side ridge 11S of the upper surface 11.
- Each cutting edge 11E is related to one corner 11C as described above.
- Each cutting edge 11E includes a corner cutting edge 41 extending to one corner 11C, a main cutting edge 41a extending from the first corner cutting edge 41 toward the adjacent corner 11C, and the first corner cutting edge 41.
- the main cutting edge 41a has a sub cutting edge 41b extending toward the opposite side.
- the cutting edge 11E will be described in more detail with the corner cutting edge 41 as the first corner cutting edge.
- Each cutting edge 11E is a cutting edge portion, that is, an assembly of a first corner cutting edge 41, a main cutting edge 41a, and a sub cutting edge 41b. Since the eight cutting edges 11E are continuous with each other, the main cutting edge 41a is connected to the next cutting edge, that is, the auxiliary cutting edge 41b of the cutting edge portion 11E, and the auxiliary cutting edge 41b is connected to the adjacent cutting edge 11E on the opposite side. Connect to the main cutting edge 41a. Therefore, the entire intersection ridge line portion of the upper surface 11 and the side surface 31 can be regarded as one cutting edge. In this case, this one cutting edge is an aggregate of eight cutting edge portions 11E.
- FIG. 5 shows an enlarged view of a peripheral portion (region V in FIG. 3) of the corner 11C related to one cutting edge 11E.
- the first corner cutting edge 41 is curved toward the outside of the cutting insert 1.
- the main cutting edge 41 a includes a first main cutting edge 42 and a second main cutting edge 43.
- a first main cutting edge 42 that is a first side ridge is connected to one side of the first corner cutting edge 41, and a secondary cutting edge 41 b that serves as a wiping edge 44 is connected to the other side of the first corner cutting edge 41. Connecting.
- a second corner cutting edge 45 is connected to the side of the first main cutting edge 42 opposite to the first corner cutting edge 41.
- the second corner cutting edge 45 is connected to the linear second side ridge, and this second side ridge is the second main cutting edge 43.
- the length of the second main cutting edge 43 is longer than that of the first main cutting edge 42.
- the relatively short first main cutting edge 42 and the relatively long second main cutting edge are connected via a corner portion (that is, a portion corresponding to the second corner cutting edge) in FIG. 5. These can function integrally as the main cutting edge 41a.
- the second main cutting edge 43 and the first main cutting edge 42 intersect so that the internal angle ⁇ becomes an obtuse angle.
- the intersection angle ⁇ is about 175 °.
- the internal angle ⁇ formed by the wiping blade 44 and the first main cutting edge 42 is an obtuse angle, but is smaller than the internal angle ⁇ formed by the second main cutting edge 43 and the first main cutting edge 42.
- the interior angle ⁇ corresponds to the interior angle of the corner 11C.
- the first corner cutting edge 41 is located at a position farthest from the intermediate surface M.
- the cutting edge portion is concavely curved between adjacent corners 11C. Therefore, the 1st main cutting edge 42 inclines in the direction which approaches the intermediate surface M (that is, the direction which approaches the lower surface 21) as it leaves
- the second main cutting edge 43 has a concave curved shape that is recessed toward the intermediate surface M (that is, toward the lower surface 21).
- the position of the lowest point of the curved portion that is closest to the intermediate surface M, that is, the lower surface 21 in the side view of the second main cutting edge 43 is located near the center of the side ridge portion 11S between the corners 11C. Therefore, a part of the second corner cutting edge 45 is inclined so as to approach the intermediate surface M as it is away from the associated first corner cutting edge in a side view.
- separates from the 1st corner cutting edge 41 (the part from the 1st main cutting edge 42 to the lowest point vicinity of the 2nd main cutting edge 43) ) May be referred to as an inclined portion in the main cutting edge 41a.
- the entire cutting edge formed on the upper surface 11 is formed at a position higher than the contact surface 15. That is, the distance from an arbitrary portion of the cutting edge of the upper surface 11 to the intermediate surface M is longer than the distance from the contact surface 15 to the intermediate surface M.
- the inclination angle of the land 12 in the direction orthogonal to the cutting edge is constant at any position, and in this embodiment is about 5 °.
- the reference of the inclination angle of the land is determined so as to be orthogonal to the central axis of the through hole 14, and is assumed to pass through the cutting edge 11E as shown in FIG. 4A or 4B. It is a plane.
- the land adjacent to the first main cutting edge 42 The width of the (first land) 12 a becomes wider as it approaches the first corner cutting edge 41.
- the land width at the position corresponding to the end far from the first corner cutting edge 41 is about 0.20 mm
- the connecting portion with the first corner cutting edge 41 The width of the land corresponding to is about 0.30 mm.
- the width of the land (second land) 12b adjacent to the second main cutting edge 43 becomes wider as it approaches the first corner cutting edge 41 like the first land adjacent to the first main cutting edge 42.
- the narrowest place in the second land may be a place closest to the intermediate surface M in a side view of the cutting insert or a place farther from the first corner cutting edge in the same cutting edge 11E.
- the second land 12b preferably has substantially the same width in a region farther from the first corner cutting edge than the narrowest place.
- the expansion ratio of the width of the land adjacent to the first main cutting edge 42 is larger than the expansion ratio of the width of the land adjacent to the second main cutting edge 43.
- the length of the first main cutting edge 42 is about 0.70 mm
- the width of the land at the narrowest place is about 0.20 mm
- at the widest place is about 0.20 mm
- the land width is about 0.30 mm
- the length of the second main cutting edge 43 is about 1.70 mm
- the land width at the narrowest place is about 0.10 mm
- the land width at the widest place is
- the shapes of the first and second lands are schematically shown in FIG.
- the width of the rake face 13 and the width of the connecting slope 16 in the top view of FIG. 3 are substantially the same throughout the entire circumference of the upper face 11. However, the width of the rake face 13 and the width of the connecting inclined face 16 are defined in the same manner as the width of the land 12.
- the side surface 31 has eight side surface portions 31a.
- Each side surface portion 31a extends approximately between the side ridge portion 11S on the upper surface and the side ridge portion 21S extending between the corners 21C on the lower surface 21.
- a concave portion 32 is formed in each of the eight side surface portions 31a.
- These recesses 32 are connected to each other in the circumferential direction of the cutting insert 1 and thus form an annular recess.
- the recess 32 is formed along the intermediate surface M, and in particular in the present embodiment, is formed substantially parallel to the intermediate surface M.
- the concave portions 32 are arranged on the lower surface 21 side with respect to the first inclined surface 33 and the first inclined surface 33 inclined from the upper surface 11 side toward the inner surface of the cutting insert 1 along the lower surface 21 side.
- a second inclined surface 34 that is inclined so as to face the inside of the cutting insert 1 as it goes toward the upper surface 11 side. That is, the first inclined surface 33 is closer to the central axis of the through-hole 14 at the lower surface side, and the second inclined surface 34 is closer to the central axis of the through-hole 14 at the upper surface side. Accordingly, the first inclined surface 33 defines the recess 32 between the second inclined surface 34.
- the first inclined surface 33 and the second inclined surface 34 are connected via a concave curved surface 32a.
- the inclination angle with respect to the intermediate surface M of the 1st inclined surface 33 is the same as the inclination angle with respect to the intermediate surface M of the 2nd inclined surface 34, you may differ.
- the cutting tool 100 has an axis extending from the distal end side to the proximal end side, and this axis is rotated as a tool rotation axis, and is sent to the workpiece.
- the cutting tool 100 includes a body 101 and a plurality of (here, eight) cutting inserts 1.
- the body 101 is substantially cylindrical and has an axis O that is a tool rotation axis of the cutting tool 100 and extends from the distal end side to the proximal end side.
- An insert mounting seat 110 for mounting the cutting insert 1 is formed at the tip of the body 101.
- the insert mounting seat 110 is shown in FIG.
- the insert mounting seat 110 has a bottom wall surface 115 and first and second side wall surfaces 111 and 112 extending in a direction intersecting the bottom wall surface 115.
- a screw hole 115 a is formed in the bottom wall surface 115.
- the first side wall surface 111 faces the tool front end side and the tool outer peripheral side.
- the second side wall surface 112 is located on the outer peripheral side of the body 101 with respect to the first side wall surface 111, faces the tool tip side, and faces the tool rotation axis O side different from the tool outer peripheral side.
- the first side wall surface 111 is aligned with the second side wall surface 112 in the circumferential direction centered on the screw hole 115 a in a plane along the bottom wall surface 115, and forms approximately 90 ° with the second side wall surface 112.
- the cutting insert 1 placed on the insert mounting seat 110 is fixed with screws.
- a screw hole 115a formed in the bottom wall surface 115 of the insert mounting seat 110. Is formed such that its center axis is located closer to the first side wall surface 111 side of the insert mounting seat 110 than the center axis of the through hole 14 of the cutting insert 1.
- the cutting insert 1 is a so-called negative type cutting insert 1. That is, except for the concave portion 32, the side surface 31 extends at an angle of 90 ° with respect to a virtual plane that is substantially orthogonal to the central axis of the through hole 14 and passes through the cutting edge. Therefore, as shown in FIGS. 7 to 10, the cutting insert 1 is arranged in front of the tool rotation direction R in order to provide an appropriate gap (so-called “relief”) between the workpiece and the side surface 31 of the cutting insert 1. It is attached so as to be inclined.
- the cutting insert 1 is attached to the insert mounting seat 110 by inclining forward in the tool rotation direction. As shown in FIG. 10, the action first corner cutting edge 41 of the action cutting edge E ′ is the tool cutting edge E ′. It is determined so as to be substantially forward most in the rotational direction.
- convex portions 113 and 114 are formed on the two side wall surfaces 111 and 112 of the insert mounting seat 110. These convex portions 113 and 114 are each formed substantially parallel to the bottom wall surface 115.
- the convex portion 114 formed on the second side wall surface 112 located on the outer peripheral side of the body 101 is more The convex portion 113 formed on the first side wall surface 111 near the tool rotation center axis O is formed at a higher position away from the bottom wall surface 115.
- the convex portion 114 formed at a relatively high position is the first inclined surface of the concave portion 32 formed in one side surface portion 31a of the side surface 31 of the cutting insert 1.
- the second inclined surface 34 with which the convex portion 113 abuts is the cutting insert. In the circumferential direction around one through-hole 14, it is at a position away from the first inclined surface 33 with which the convex portion 114 abuts.
- the first side wall surface 111 is located on the substantially opposite side of the working cutting edge E ′ with the through hole 14 interposed therebetween. Accordingly, the convex portion 113 is formed so that the mutual contact between the convex portion 113 and the second inclined surface 34 exerts a force in a direction in which the cutting insert 1 is pressed against the bottom wall surface 115 side of the insert mounting seat 110 on the cutting insert. Yes.
- the length along the bottom wall surface 115 of the first side wall surface 111 is longer than the length along the bottom wall surface 115 of the second side wall surface 112 so as to enhance such action and effect by the convex portion 113.
- the cutting tool 100 is rotated around the tool rotation axis O and sent to the workpiece.
- the working first corner cutting edge 41 among the working cutting edges E ′ is substantially most forward in the tool rotation direction. Therefore, when the working cutting edge E ′ cuts into the workpiece, the working cutting edge E ′ gradually cuts into the workpiece from the working first corner cutting edge 41.
- the action first main cutting edge 42 is arranged along the action first main cutting edge 42 as the intermediate surface M is separated from the related corner 11E, that is, the adjacent action first corner cutting edge 41. Tilt to approach.
- the inclination angle with respect to the intermediate surface M of the portion of the rake face 13 inside the action first main cutting edge 42 is larger as the position is closer to the action first corner cutting edge 41.
- the inclination angle is maximized at the portion of the rake face 13 inside the working first corner cutting edge 41.
- the sharpness of the cutting edge increases as the inclination angle of the rake face with respect to the intermediate surface increases.
- the ease of cutting changes according to the inclination angle of the rake surface with respect to the intermediate surface.
- the impact applied to the working first corner cutting edge 41 when the working first corner cutting edge 41 is cut into the workpiece is reduced. This makes it difficult for heat to be accumulated at the cutting edge of the working first corner cutting edge 41.
- the amount of heat accumulated in the cutting edge decreases, for example, softening of the rake face 13 that is a peripheral part thereof is suppressed, and crater wear is less likely to occur on the rake face 13.
- the cutting edge portion located relatively far from the first corner cutting edge 41 has a relatively small impact at the time of cutting, when it is considered as a whole cutting edge to reduce the rake angle and increase the edge strength The tool life is extended.
- the second main cutting edge 43 has a concave curved shape that is recessed toward the lower surface 21, and its lowest point is near the center of the side ridge 11S. Therefore, when cutting is performed using the entire cutting edge, particularly the entire working main cutting edge 41a, the cross-sectional shape of the generated chip becomes V-shaped. In other words, the chips are generated in a shape that is bent at the portion corresponding to the center of the main cutting edge 41a and the portions at both ends are raised. When both ends of the chip are lifted, the chip is easily separated from the portion of the rake face 13 near the working first corner cutting edge 41, and the chip is a portion of the rake face 13 near the working first corner cutting edge 41. The frequency and strength of rubbing can be suppressed.
- connection portion between the contact surface 15 and the connecting inclined surface 16 is deformed at the time of manufacturing the cutting insert 1, more specifically during sintering, as the rising angle of the connecting inclined surface 16 with respect to the contact surface 15 is closer to 90 °. Is likely to occur.
- the rising angle is sufficiently smaller than 90 ° and the connecting inclined surface 16 gently extends toward the tip end side of the cutting edge, deformation hardly occurs during sintering.
- the height from the contact surface 15 to the tip of the cutting edge is the portion inside the working first corner cutting edge 41. Is the highest.
- the inclination angle of the portion of the rake face 13 inside the first corner cutting edge 41 is larger than other portions, the inclination of the rake face inside the first corner cutting edge 41 and the second corner cutting edge 45, for example.
- the rising angle of the portion of the connecting inclined surface 16 connected to the portion of the rake face 13 inside the first corner cutting edge 41 can be made gentle.
- the inclination angle of the rake face 13 corresponding to the first corner cutting edge 41 is set to 2
- the angle of inclination of the rake face of the first main cutting edge 42 on the side of the main cutting edge 43 is larger than that when they are the same, the end of the rake face 13 that is far from the cutting edge is attached. Since it approaches the contact surface 15 in the central axis direction of the hole 14, the rising angle of the connecting inclined surface 16 from the contact surface 15 becomes gentle. For this reason, in the cutting insert 1, a crack at the time of manufacture is unlikely to occur at the connection portion between the contact surface 15 and the connecting inclined surface 16. More specifically, during the production of the cutting insert 1, cracks are unlikely to occur at the locations during powder pressure molding and sintering.
- the width of the land 12 formed on the upper surface 11 adjacent to the first main cutting edge 42 increases as it goes toward the first corner cutting edge 41.
- chips flow along the lands 12 to the rake face 13. Therefore, the chip discharge direction is locally orthogonal to the boundary between the land 12 and the rake face 13. That is, chips generated by cutting with the working first cutting edge 42 begin to occur in a direction perpendicular to the working first main cutting edge (see arrow a11 in FIG. 12). Then, the chip discharge direction changes in a direction perpendicular to the intersecting ridge line portion between the land 12 adjacent to the working first main cutting edge and the rake face 13 (see arrow a12 in FIG. 12).
- the outflow direction of the arrow a12 is a direction away from the cutting surface (for example, see line S3 in FIG. 12) of the workpiece by the action wiping blade 44 than the outflow direction of the arrow a11. Therefore, the chips flowing out from the working first corner cutting edge 41 and the working wiping blade 44 are cut off relatively quickly with the chips flowing out from the portion of the working first main cutting edge closer to the working first corner cutting edge 41. Leave the blade. For this reason, the burden on the working first corner cutting edge 41 and the working wiping blade 44 is reduced, the load and the heat effect on the working first corner cutting edge 41 are reduced, and the working first corner cutting edge 41 is not easily chipped.
- FIG. 12 is a diagram exaggerating only the cutting edge of FIG. 5 in the V region of FIG. 3 and the land 12 adjacent to the cutting edge, and the cutting edge when the cutting edge is used as the working cutting edge. It is a figure for demonstrating the outflow direction of a waste.
- the chip tends to flow out toward a region where the boundary region between the action first main cutting edge 42 and the action second main cutting edge 43 extends to the inside of the insert. That is, a repulsive force that repels each other is generated between the chip flowing out from the working first main cutting edge 42 and the chip flowing out from the working second main cutting edge 43.
- This makes it possible for the working second main cutting edge 43 to bear a part of the load applied to the working first main cutting edge 42 as compared with the case where the expansion ratio of the land width is the same. That is, the chip flowing out from the working second main cutting edge 43 that generates a chip mainly with a relatively long cutting edge boosts the outflow of the chip from the working first main cutting edge 42. Thereby, the burden on the operation first main cutting edge 42 is further reduced. By reducing the burden on the action first main cutting edge 42, the action first corner cutting edge 41 is further less likely to be chipped.
- the main cutting edge 41a formed on the upper surface 11 extends from the first main cutting edge 42 to the middle of the second main cutting edge 43 in the direction along the cutting edge, and the intermediate surface M as the distance from the first corner cutting edge 41 increases. It is inclined to approach. For this reason, the cutting insert 1 can be arrange
- the recess 32 formed on the side surface 31 of the cutting insert 1 of the present embodiment has an effect of preventing the cutting insert 1 from being lifted by cutting resistance. That is, when a main component force directed toward the bottom wall surface 115 of the insert mounting seat 110 is applied to the main cutting edge 41a including the second main cutting edge 43 and the first main cutting edge 42, the second main cutting edge 43 and the first main cutting edge 43a. A part of the lower surface of the cutting insert 1 that is substantially opposite to the cutting edge 42 across the through hole 14 tends to float from the bottom wall surface of the insert mounting seat 110.
- the convex portion 113 of the first side wall surface 111 has an abutting surface that forms an acute angle with the bottom wall surface 115, and the second inclined surface 34 of the concave portion 32 forms an acute angle with respect to the lower surface 21, that is, the bottom wall surface 115.
- the convex portion 113 of the first side wall surface 111 of the insert mounting seat 110 that comes into contact with the second inclined surface 34 functions to suppress the lifting.
- the convex portion 114 of the second side wall surface 112 of the insert mounting seat 110 abuts against the first inclined surface 33 of the concave portion 32, so that the head of the fixing screw and the inner wall of the through hole 14 come into contact with each other. Suppressing the lifting of the tip side of the generated cutting insert 1 is suppressed. That is, since the center axis of the screw is shifted closer to the first side wall surface 111 than the center axis of the through hole 14, the moment in the direction in which the cutting insert 1 lifts the portion located on the tool tip side of the cutting insert 1 from the screw. Receive.
- the convex portion 114 of the second side wall surface 111 has an abutting surface that forms an obtuse angle with respect to the bottom wall surface 115, and the first inclined surface 33 of the concave portion 32 forms an obtuse angle with respect to the lower surface 21, that is, the bottom wall surface 115.
- the convex portion 114 in contact with the first inclined surface 33 gives a moment in the direction in which the portion positioned on the tool tip side of the cutting insert 1 is pressed against the bottom wall surface 115 side of the insert mounting seat 110. Therefore, lifting of the cutting insert 1 is prevented.
- the present invention has been described based on the above embodiment, the present invention is not limited to the above embodiment.
- the present invention can take various forms within the scope of the invention other than the above-described embodiments.
- the basic shape of the cutting insert when viewed from above is an octagon, but it may be another polygon such as a triangle, a quadrangle, a pentagon, or a hexagon.
- the cutting insert 1 is a negative type, but may be a so-called positive type. That is, the side surface 31 may have an acute angle in the insert with respect to a virtual plane that is orthogonal to the central axis of the through-hole 14 and that passes through the cutting edge.
- the second main cutting edge 43, the first main cutting edge 42, and the wiping edge 44 may not be linear in a top view as in the above-described embodiment, but may be curved. When these cutting edge portions are curved, various angles may be defined using strings formed by connecting ends of the cutting edge portions.
- the angle ⁇ formed by the second main cutting edge 43 and the first main cutting edge 42 is set to 175 ° in the above-described embodiment, but is not limited to this angle. If the angle ⁇ formed by the second main cutting edge 43 and the first main cutting edge 42 is in the range of 130 ° ⁇ ⁇ ⁇ 180 °, the above effect is sufficiently produced.
- the expansion ratio of the width of the first land 12a adjacent to the first main cutting edge 42 with respect to the expansion ratio of the width of the second land 12b adjacent to the second main cutting edge 43 is about 2.4 times in the above-described embodiment. However, it is not limited to that value. The above effect is sufficiently obtained if the expansion rate of the first land of the first main cutting edge 42 is about 2 to 5 times the expansion rate of the second land of the second main cutting edge 43.
- the inclination angle with respect to the intermediate surface of the land is set to 5 °, but it is not limited to this value.
- the inclination angle of the land can be appropriately changed according to the usage mode of the cutting insert.
- the inclination angle of the rake face with respect to the intermediate face can be changed as appropriate.
- the inclination angle of the rake face may be set based on both the influence of the heat of the action first corner cutting edge and the sharpness.
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Abstract
Description
第1の端面および前記第1の端面に対向する第2の端面と、
前記第1の端面と前記第2の端面とをつなぐ側面と、
前記第1の端面と前記側面との交差稜線部に延在する少なくとも一つの切れ刃であって、各切れ刃は、前記第1の端面のコーナに延在するコーナ切れ刃と、該コーナ切れ刃につながる主切れ刃とを備える、切れ刃と
を備える切削インサートであって、
前記第1の端面には、前記切れ刃に沿ってすくい面が形成され、該すくい面は、切れ刃から離れるにしたがい前記第2の端面側に傾斜し、
前記切削インサートを側面視するとき、前記主切れ刃は、前記コーナ切れ刃から前記第2の端面に近づく向きに傾斜する傾斜部を備え、
前記傾斜部に沿った前記すくい面の部分は、前記第1の端面と前記側面との交差稜線部に沿った方向で前記コーナに近い位置ほど前記第2の端面側に傾く角度が大きいように形成されている、
切削インサート
が提供される。
Claims (12)
- 第1の端面(11)および前記第1の端面に対向する第2の端面(21)と、
前記第1の端面と前記第2の端面とをつなぐ側面(31)と、
前記第1の端面と前記側面との交差稜線部に延在する少なくとも一つの切れ刃(11E)であって、各切れ刃は、前記第1の端面のコーナ(11C)に延在するコーナ切れ刃(41)と、該コーナ切れ刃につながる主切れ刃(41a)とを備える、切れ刃(11E)と
を備える切削インサートであって、
前記第1の端面には、前記切れ刃に沿ってすくい面(13)が形成され、該すくい面は、切れ刃から離れるにしたがい前記第2の端面側に傾斜し、
前記切削インサートを側面視するとき、前記主切れ刃は、前記コーナ切れ刃(41)から前記第2の端面に近づく向きに傾斜する傾斜部を備え、
前記傾斜部に沿った前記すくい面の部分は、前記第1の端面と前記側面との前記交差稜線部に沿った方向で前記コーナに近い位置ほど前記第2の端面側に傾く角度が大きいように形成されている、
切削インサート(1)。 - 前記切削インサートを側面視するとき、前記主切れ刃(41a)は前記第2の端面に向かって凹湾曲する、請求項1に記載の切削インサート(1)。
- 前記第1の端面に対向する方向から見るとき、前記主切れ刃(41a)は、第1主切れ刃部分(42)と、該第1主切れ刃部分と鈍角の内角(θ)をなす第2主切れ刃部分(43)とを有し、
前記第1の端面には、前記切れ刃と前記すくい面との間にランド(12)が形成され、
該ランドにおける、前記第1主切れ刃と前記すくい面との間に延在する第1ランド(12a)の幅は前記コーナに近づくほど広くなる、
請求項1または2のいずれかに記載の切削インサート(1)。 - 前記第2主切れ刃部分(43)と前記すくい面との間に延在する第2ランド(12b)の幅は前記コーナに近づくほど広くなり、
前記第1ランドの幅の拡大率は、前記第2ランドの幅の拡大率よりも大きい、
請求項3に記載の切削インサート(1)。 - 前記第1主切れ刃部分(42)は、前記第2主切れ刃部分(43)よりも短い、請求項3または4に記載の切削インサート(1)。
- 前記切れ刃は、前記コーナ切れ刃(41)の前記主切れ刃(41a)とは反対側につながる副切れ刃(41b)を備え、
前記第1の端面に対向する方向から見るとき、前記コーナの内角(γ)は、第1主切れ刃部分(42)と前記第2主切れ刃部分(43)との間の前記内角(θ)よりも小さい、
請求項3から5のいずれか一項に記載の切削インサート(1)。 - 前記第1の端面と前記第2の端面とを貫通する貫通孔(14)を更に備え、
前記第1の端面と前記側面との前記交差稜線部に延在するn個の切れ刃(11E)は、 該貫通孔(14)の中心軸線(A1)周りにn回回転対称に配置されていて(ただし、nは2以上の整数)、
前記切削インサートは前記貫通孔の前記中心軸線に直交する軸線(A2)に対して180°回転対称である、
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)。 - 前記側面に第1傾斜面(33)と、該第1傾斜面よりも前記第2の端面側に配置されかつ前記切削インサートの周方向において該第1傾斜面(33)から離れた位置にある第2傾斜面(34)とが形成され、
前記第1傾斜面は前記第2の端面に近い箇所ほど前記切削インサートの内側に向くように傾斜し、
前記第2傾斜面は前記第1の端面に近い箇所ほど該切削インサートの内側に位置するように傾斜する、
請求項1から7のいずれか一項に記載の切削インサート(1)。 - 請求項8に記載の切削インサートを着脱自在に装着するボデー(101)であって、
前記ボデーは前記切削インサートを取り付けるためのインサート取付座(110)を備え、
前記インサート取付座は第1側壁面(111)を備え、
前記第1側壁面(111)は前記切削インサートの前記側面に形成された第2傾斜面(34)に当接する凸部(113)を備える、
ボデー(101)。 - 前記ボデーの外形形状は略円筒状であり、
前記インサート取付座は前記第1側壁面よりも前記ボデーの外周側に位置する第2側壁面(112)をさらに有し、
前記第2側壁面は前記切削インサートの前記側面に形成された第1傾斜面(33)に当接する凸部(114)を備える、
請求項9に記載のボデー(101)。 - 請求項1から8のいずれか一項に記載の切削インサート(1)と、
該切削インサートが着脱自在に装着されるボデー(101)と
を備える切削工具(100)。 - 前記切削インサートは請求項8に記載の切削インサートであり、
前記ボデーは請求項9または10に記載のボデーである、
請求項11に記載の切削工具(100)。
Priority Applications (4)
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EP15800627.0A EP3150318B1 (en) | 2014-05-26 | 2015-05-25 | Cutting insert and cutting tool |
CN201580027651.2A CN106413958B (zh) | 2014-05-26 | 2015-05-25 | 切削刀片、主体及切削刀具 |
US15/313,109 US10131002B2 (en) | 2014-05-26 | 2015-05-25 | Cutting insert having varying rake angle and variable-width land, and cutting tool |
JP2016523489A JP5979619B2 (ja) | 2014-05-26 | 2015-05-25 | 切削インサート、ボデーおよび切削工具 |
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EP (1) | EP3150318B1 (ja) |
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- 2015-05-25 JP JP2016523489A patent/JP5979619B2/ja active Active
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JP7239043B1 (ja) | 2022-05-26 | 2023-03-14 | 株式会社タンガロイ | 切削インサート |
JP2023173710A (ja) * | 2022-05-26 | 2023-12-07 | 株式会社タンガロイ | 切削インサート |
Also Published As
Publication number | Publication date |
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JP5979619B2 (ja) | 2016-08-24 |
JPWO2015182562A1 (ja) | 2017-04-20 |
US10131002B2 (en) | 2018-11-20 |
EP3150318A1 (en) | 2017-04-05 |
US20170189972A1 (en) | 2017-07-06 |
CN106413958A (zh) | 2017-02-15 |
EP3150318B1 (en) | 2023-02-01 |
EP3150318A4 (en) | 2018-01-17 |
CN106413958B (zh) | 2018-12-04 |
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