WO2022181773A1 - 切削インサートのクランプ構造および刃先交換式切削工具 - Google Patents
切削インサートのクランプ構造および刃先交換式切削工具 Download PDFInfo
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- WO2022181773A1 WO2022181773A1 PCT/JP2022/007935 JP2022007935W WO2022181773A1 WO 2022181773 A1 WO2022181773 A1 WO 2022181773A1 JP 2022007935 W JP2022007935 W JP 2022007935W WO 2022181773 A1 WO2022181773 A1 WO 2022181773A1
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- WO
- WIPO (PCT)
- Prior art keywords
- cutting insert
- supporter
- hole
- cutting
- insert
- Prior art date
Links
- 238000005520 cutting process Methods 0.000 title claims abstract description 340
- 238000003825 pressing Methods 0.000 claims abstract description 83
- 230000000452 restraining effect Effects 0.000 claims abstract description 30
- 230000002093 peripheral effect Effects 0.000 claims description 74
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000004048 modification Effects 0.000 description 33
- 238000012986 modification Methods 0.000 description 33
- 230000000694 effects Effects 0.000 description 12
- 238000006073 displacement reaction Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000005489 elastic deformation Effects 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011195 cermet Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
- B23B27/1614—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped with plate-like cutting inserts of special shape clamped against the walls of the recess in the shank by a clamping member acting upon the wall of a hole in the insert
- B23B27/1622—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped with plate-like cutting inserts of special shape clamped against the walls of the recess in the shank by a clamping member acting upon the wall of a hole in the insert characterised by having a special shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
- B23B29/04—Tool holders for a single cutting tool
- B23B29/046—Tool holders for a single cutting tool with an intermediary toolholder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2205/00—Fixation of cutting inserts in holders
- B23B2205/12—Seats for cutting inserts
- B23B2205/125—One or more walls of the seat being elastically deformable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2226/00—Materials of tools or workpieces not comprising a metal
- B23B2226/12—Boron nitride
- B23B2226/125—Boron nitride cubic [CBN]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2226/00—Materials of tools or workpieces not comprising a metal
- B23B2226/31—Diamond
Definitions
- the present invention relates to a cutting insert clamp structure and an indexable cutting tool.
- This application claims priority to Japanese Patent Application No. 2021-028916 filed in Japan on February 25, 2021 and Japanese Patent Application No. 2022-024232 filed in Japan on February 18, 2022, and the content thereof is incorporated here.
- an indexable cutting tool described in Patent Document 1 is known.
- the indexable cutting tool includes a tool body having an insert mounting seat, a cutting insert made of a hard material, a carrier body holding the cutting insert, a clamp member fixing the cutting insert and the carrier body to the insert mounting seat, Prepare.
- the carrier body by using the carrier body, the outer shape of the expensive cutting insert can be kept compact, and the effect of cost reduction can be obtained.
- the carrier body has a pair of gripping arms.
- the pair of gripping arms are elastically deformed.
- the pair of gripping arms are elastically deformed so as to narrow the width dimension of the vertical slot positioned between them, and are moved closer to each other.
- the outer peripheral surface of the cutting insert is clamped by the inner surface of each gripping arm.
- the two side walls (the lateral inner wall and the rear inner wall) arranged side by side on the inner surface of each gripping arm contact two side surfaces arranged side by side on the outer peripheral surface of the cutting insert. .
- Patent Document 1 there is room for improvement in stably holding the cutting insert with the carrier body.
- One of the objects of the present invention is to provide a cutting insert clamp structure and an indexable cutting tool capable of stably holding the cutting insert while reducing the cost by making the cutting insert more compact.
- One aspect of the present invention is a clamping structure for a cutting insert that is detachably attached to an insert mounting seat of a tool body by a clamping member, the cutting insert having a polygonal columnar shape and a cutting edge disposed at least at the front end thereof.
- An insert and a plate-shaped supporter that holds the outer peripheral surface of the cutting insert from the side and rear, and the cutting insert has a pressing surface that is arranged at least on a portion of the outer peripheral surface that faces the side. and a surface to be restrained disposed on a portion of the outer peripheral surface located behind the surface to be pressed, and the supporter includes a supporter body to which the clamp member is locked, and the supporter body.
- a gripping arm that protrudes in a direction perpendicular to the plate thickness direction of the supporter and is elastically deformable with respect to the supporter body; Pockets and slits disposed between the supporter body and the gripping arm and opening on both sides of the supporter in the plate thickness direction, and the supporter body has a restraining surface in contact with the restrained surface.
- the gripping arm has a pressing surface that contacts the surface to be pressed
- the slit has a pocket opening that opens into the pocket, and the pocket opening connects the restraining surface and the pressing surface. placed between the faces.
- the supporter holds the cutting insert, so that the outer shape of the cutting insert made of an expensive hard material such as cemented carbide can be kept small. Therefore, tool costs can be reduced.
- the gripping arm is elastically deformed when the clamping structure of the cutting insert, ie, the cutting insert and the supporter are clamped to the insert mounting seat by the clamping member. Specifically, the clamping member is engaged with the supporter body and, for example, by applying a backward pulling force to the clamping member, the gripping arm is pressed against the side wall of the insert mounting seat and elastically deformed. The elastic deformation of the gripping arm causes the pressing surface of the gripping arm to press the pressed surface of the cutting insert.
- the gripping arm is elastically deformed to press the pressing surface of the cutting insert with the pressing surface of the gripping arm.
- the restraining surface and the pressing surface are separated by the slit positioned between them and are relatively displaceable. Therefore, the restraining surface of the supporter and the restrained surface of the cutting insert, and the pressing surface of the supporter and the pressing surface of the cutting insert can be brought into contact with each other stably. That is, the constrained surface and the pressed surface of the cutting insert can be stably pressed by the constraining surface and the pressing surface of the supporter.
- the cutting insert has a front-back symmetrical shape in the plate thickness direction and a front-back symmetrical shape in the front-rear direction.
- the cutting insert has a hexagonal prism shape
- the outer peripheral surface includes a pair of front side walls facing forward, a pair of rear side walls facing rearward, and a joint between the front side wall and the rear side wall. a pair of laterally facing lateral sidewalls positioned therebetween, wherein said constrained surface is located on said rear sidewall and said pressed surface is located on at least said lateral sidewall.
- the supporter can hold the rear side wall and the lateral side wall of the outer peripheral surface of the cutting insert. The holding state of the cutting insert by the supporter is stabilized.
- the supporter body has a through hole positioned on the central axis of the supporter and penetrating the supporter body in the plate thickness direction, and the through hole includes one part of the clamp member. Preferably the part is inserted and locked.
- the clamp member can be locked to the supporter body with a simple structure.
- the supporter has a rectangular plate shape, and the center axis of the through hole is arranged coaxially with the center axis of the supporter.
- the rear end portion of the cutting insert is located forward of the central axis of the supporter.
- the cutting insert clamping structure of the present invention can be applied to an existing indexable cutting tool in which a square plate-shaped cutting insert conforming to general ISO standards is attached to the insert mounting seat.
- the product of the present invention can be mounted on the insert mounting seat of the tool body of the conventional product, and versatility is enhanced.
- the cutting insert can be pulled out upward from the pocket, a part of the clamp member is inserted into the through hole from below, and the through hole is the through hole. and a contacted portion with which a part of the clamp member contacts; and a retaining portion projecting into the through hole.
- a part of the clamping member is inserted into the through hole of the supporter from below and comes into contact with the contacted portion of the through hole. A part of the clamp member presses the contacted portion, thereby fixing the supporter and the cutting insert to the insert mounting seat. Further, when removing the cutting insert from the supporter, the state in which a part of the clamp member presses the contacted portion can be released, and the cutting insert can be extracted upward from the pocket.
- the contacted portion is arranged at least on the rear end portion of the inner peripheral surface of the through hole, and the retaining portion is arranged on at least the rear end portion of the inner peripheral surface of the through hole. is preferably placed in the
- a portion of the clamp member presses the contacted portion of the through hole rearward, so that the rearward pressing force can stably fix the supporter and the cutting insert to the insert mounting seat.
- a force that pulls the supporter forward and upward may act due to, for example, catching between the cutting insert and the pocket.
- the retaining portion stably comes into contact with a part of the clamp member from the rear lower side, so that the above-mentioned effect becomes even more remarkable.
- the through hole preferably has an upside-down symmetrical shape.
- the clamping structure of the cutting insert of the present invention can be applied to, for example, cutting tools with opposite sides.
- the same supporter can be used as a common product regardless of whether the cutting tool is right-handed or left-handed. Therefore, the versatility of the supporter is enhanced, and member management is easy.
- the slit extends around the central axis of the supporter when viewed from the plate thickness direction.
- the slit has an arc shape when viewed from the plate thickness direction.
- the clamping structure for the cutting insert it is preferable that a pair of the gripping arms are provided, and the pocket is arranged between the pair of gripping arms.
- the elastic deformation of the pair of gripping arms ensures a large amount of relative displacement between the pressing surfaces of the pair of gripping arms. Therefore, it is easy to attach and detach the cutting insert to and from the pocket.
- the cutting insert when the cutting insert is miniaturized as in the present invention, it is conceivable that the cutting insert may be unintentionally dropped or lost when attaching/detaching it to/from the supporter. Therefore, such dropping or loss is suppressed.
- the cutting insert can be stably held while the cutting insert is made compact and the cost is reduced.
- FIG. 1 is a perspective view showing a clamping structure for a cutting insert according to a first embodiment and a part of an indexable cutting tool.
- FIG. 2 is a perspective view showing the clamp structure of the cutting insert of the first embodiment.
- FIG. 3A is a top view showing the clamping structure of the cutting insert;
- FIG. 3B is a front view showing the clamping structure of the cutting insert;
- FIG. 4 is a side view showing the clamping structure of the cutting insert.
- FIG. 5 is a perspective view showing a cutting insert.
- FIG. 6A is a top view showing a cutting insert;
- FIG. FIG. 6B is a front view showing the cutting insert;
- FIG. 6C is a side view showing the cutting insert;
- FIG. 7 is a perspective view showing a supporter.
- FIG. 8 is a perspective view showing the clamping structure of the cutting insert of the first modified example of the first embodiment.
- FIG. 9 is a perspective view showing a clamping structure for a cutting insert according to a second modification of the first embodiment.
- FIG. 10 is a perspective view showing a clamping structure for a cutting insert according to a third modification of the first embodiment.
- FIG. 11 is a top view showing the clamping structure of the cutting insert of the third modification of the first embodiment.
- FIG. 12 is a perspective view showing a supporter of a third modified example of the first embodiment;
- FIG. 13 is a top view showing part of the indexable cutting tool of the second embodiment.
- FIG. 14 is a side view showing part of the indexable cutting tool of the second embodiment.
- FIG. 15 is a front view showing part of the indexable cutting tool of the second embodiment.
- 16 is a cross-sectional view taken along line XVI-XVI of FIG. 13, showing a state in which the clamp member clamps the supporter and the cutting insert.
- FIG. 17 is a cross-sectional view taken along line XVI-XVI of FIG. 13, showing a state in which the supporter and the cutting insert are unclamped by the clamp member.
- FIG. 18 is a perspective view showing the clamping structure of the cutting insert of the second embodiment.
- FIG. 19 is a perspective view showing a cutting insert;
- FIG. 20A is a top view showing a cutting insert;
- FIG. 20B is a rear view of the cutting insert;
- FIG. 20C is a side view showing the cutting insert;
- FIG. 20A is a top view showing a cutting insert;
- FIG. 20B is a rear view of the cutting insert;
- FIG. 20C is a side view showing the cutting insert;
- FIG. 21 is a perspective view showing a supporter.
- FIG. 22 is a top view showing the supporter.
- 23 is a cross-sectional view showing the XXIII-XXIII section of FIG. 22.
- FIG. 24 is a cross-sectional view showing a part of the clamping structure of the cutting insert of the fourth modification of the second embodiment, omitting the illustration of the sheet member.
- FIG. 25 is a cross-sectional view showing a part of the clamping structure of the cutting insert of the fifth modified example of the second embodiment, omitting the illustration of the sheet member.
- FIG. 26 is a cross-sectional view showing a part of the clamping structure of the cutting insert of the sixth modification of the second embodiment, omitting the illustration of the sheet member.
- FIG. 1 A clamp structure 10 for a cutting insert according to a first embodiment of the present invention and an indexable cutting tool 1 including the same will be described with reference to FIGS. 1 to 7.
- FIG. The indexable cutting tool 1 of the present embodiment is an indexable cutting tool used for turning, and is detachably attached to a tool post of a machine tool such as a lathe (not shown).
- the indexable cutting tool 1 may be simply called a cutting tool or a tool.
- the indexable cutting tool 1 includes a cutting insert clamp structure 10, a tool body 4 having an insert mounting seat 5, and a clamp member fixing the cutting insert clamp structure 10 to the insert mounting seat 5. 6 and .
- the cutting insert clamp structure 10 is detachably attached to the insert mounting seat 5 of the tool body 4 by the clamp member 6 .
- the cutting insert clamp structure 10 includes a cutting insert 2 having a polygonal columnar shape and a plate-like supporter 3 that holds the cutting insert 2 .
- the supporter 3 has a rectangular plate shape centered on the central axis C1.
- the supporter 3 has a pair of plate surfaces 3a and 3b facing in opposite directions to each other in the direction in which the central axis C1 extends, that is, in the axial direction of the central axis C1.
- One plate surface 3a of the pair of plate surfaces 3a and 3b is the front surface 3a, and the other plate surface 3b is the back surface 3b.
- the supporter 3 also has a concave pocket 33 arranged at one of the four corners of the supporter 3 (see FIG. 7).
- a cutting insert 2 is arranged in the pocket 33 .
- the plate thickness direction In this embodiment, the direction in which the pair of plate surfaces 3a and 3b of the supporter 3 face is called the plate thickness direction or the vertical direction.
- the plate thickness direction corresponds to the Z-axis direction.
- the plate thickness directions the direction from the back surface 3b to the front surface 3a (+Z side) is called the upper side, and the direction from the front surface 3a to the back surface 3b ( ⁇ Z side) is called the lower side.
- the plate thickness direction corresponds to the axial direction of the central axis C1 of the supporter 3 . Therefore, the plate thickness direction may be rephrased as the axial direction.
- a predetermined direction passing through one corner where the pocket 33 of the supporter 3 is arranged and another corner positioned diagonally from the one corner is called the front-back direction.
- the front-rear direction corresponds to the X-axis direction.
- the direction (-X side) from another corner to one corner (pocket 33) is called forward, and the direction (+X side) from one corner to the other corner is called rear. call.
- a direction perpendicular to the plate thickness direction and the front-rear direction is called a lateral direction or a left-right direction.
- the lateral direction corresponds to the Y-axis direction.
- the +Y side corresponds to the left side when the cutting insert clamp structure 10 is viewed from the front
- the ⁇ Y side corresponds to the right side when the cutting insert clamp structure 10 is viewed from the front.
- the upper side, the lower side, the front side, the rear side, the left side, and the right side are simply names for explaining the relative positional relationship of each part, and the actual positional relationship and the like are the positions indicated by these names. It may be a layout relationship other than the relationship.
- a direction orthogonal to the central axis C1 of the supporter 3 is called a radial direction.
- the direction closer to the central axis C1 is called the radial inner side
- the direction away from the central axis C1 is called the radial outer side.
- the direction in which the supporter 3 revolves around the central axis C1 is called the circumferential direction.
- the central axis C1 may be called the supporter central axis C1
- the axial direction may be called the supporter axial direction.
- the radial direction may be rephrased as the radial direction of the supporter.
- the circumferential direction may also be called the supporter circumferential direction.
- the direction in which the insert central axis C2 of the cutting insert 2 extends is called the insert axial direction.
- the insert center axis C2 of the cutting insert 2 is positioned forward of the center axis C1 of the supporter 3 and extends parallel to the center axis C1. That is, the insert axial direction corresponds to the supporter axial direction, plate thickness direction, and vertical direction.
- a direction orthogonal to the insert center axis C2 is called an insert radial direction. In the insert radial direction, the direction closer to the insert center axis C2 is called the insert radial inside, and the direction away from the insert center axis C2 is called the insert radial outside.
- the direction of rotation around the insert center axis C2 is called the insert circumferential direction.
- the tool body 4 is made of metal such as steel. As shown in FIG. 1, the tool body 4 has a substantially prismatic shape and extends along a tool central axis (not shown).
- the insert mounting seat 5 is arranged at the first end portion 4a of both ends of the tool body 4 (the first end portion 4a and the second end portion (not shown)).
- the direction in which the tool center axis extends may be called the tool axis direction.
- the direction from the second end portion to the first end portion 4a may be called the front end side
- the direction from the first end portion 4a to the second end portion may be called the rear end side.
- the tool body 4 has a top surface 41 and a bottom surface 42 facing in opposite directions, a pair of lateral surfaces 43 and 44 facing in opposite directions, and a tip surface 45 positioned on the end surface of the first end portion 4a.
- the top surface 41 faces upward.
- the tool body 4 also has an inclined surface 41a.
- the inclined surface 41a is arranged on a portion of the top surface 41 located at the first end portion 4a.
- the inclined surface 41a has a planar shape that is inclined downward toward the rear.
- a bottom surface 42 of the outer surface of the tool body 4 faces downward.
- One lateral surface 43 of the outer surface of the tool body 4 faces rightward. A portion of the lateral surface 43 located at the first end portion 4a of the tool body 4 protrudes to the right side more than portions other than the first end portion 4a. The other lateral surface 44 of the outer surface of the tool body 4 faces leftward.
- the tool body 4 has an insert mounting seat 5 to which the cutting insert 2 and the supporter 3 are detachably mounted, and a threaded hole (not shown) into which a clamp screw 6b (described later) of the clamp member 6 is screwed.
- the screw hole opens in a portion of the top surface 41 located between the insert mounting seat 5 and the inclined surface 41a and extends substantially in the vertical direction.
- the insert mounting seat 5 has a plate-like seat member 51 .
- the seat member 51 constitutes a portion (bottom surface) of the insert mounting seat 5 .
- the sheet member 51 has a sheet hole (not shown) penetrating the sheet member 51 in the thickness direction.
- the sheet member 51 is fixed to the first end portion 4a by a sheet fixing screw (not shown) inserted through the sheet hole.
- the sheet member 51 has a rectangular plate shape.
- the sheet member 51 is made of cemented carbide, for example.
- the insert mounting seat 5 opens to the top surface 41, one lateral surface 43 and the tip surface 45 at the first end 4a of the tool body 4, that is, the tip.
- the insert mounting seat 5 is recessed from the top surface 41 , one side surface 43 and the tip surface 45 of the tool body 4 .
- the insert mounting seat 5 is a recess capable of receiving the clamping structure 10 of the cutting insert, ie the cutting insert 2 and the supporter 3 .
- the insert mounting seat 5 has a substantially rectangular concave shape.
- the insert mounting seat 5 has a bottom wall 5 a that contacts the back surface 22 of the cutting insert 2 and the back surface 3 b of the supporter 3 , and side walls 5 b that contact the outer peripheral surface 3 c of the supporter 3 .
- the bottom wall 5 a is configured by one of the pair of plate surfaces of the sheet member 51 (upper surface) facing upward.
- a plurality of side walls 5b are provided.
- the insert mounting seat 5 has a pair of side walls 5b.
- the angle formed between the pair of side walls 5b is, for example, 80° when viewed from above and below.
- the cutting insert 2 is made of cemented carbide, PCD (polycrystalline diamond), cBN (cubic boron nitride), cermet, ceramic, or the like, for example.
- the cutting insert 2 is a hard sintered body having higher hardness than the tool body 4 .
- the cutting insert 2 is detachably attached to the pocket 33 of the supporter 3 .
- the cutting insert 2 is fixed in the pocket 33 by being clamped to the supporter 3 .
- the cutting insert 2 of this embodiment has a hexagonal prism shape centered on the insert central axis C2.
- the dimension of the cutting insert 2 in the front-rear direction is larger than the dimension of the cutting insert 2 in the left-right direction. That is, the cutting insert 2 extends in the front-rear direction.
- the dimension of the cutting insert 2 in the left-right direction that is, the width dimension is, for example, 3 mm or more and 6 mm or less.
- the cutting insert 2 has a front surface 21 and a back surface 22 facing up and down, an outer peripheral surface 23 connected to the front surface 21 and the back surface 22, and at least the front surface 21 and the outer peripheral surface. and a cutting edge 24 arranged on the ridge line to which the cutting edge 23 is connected.
- the surface 21 has a polygonal shape, and in this embodiment, has a hexagonal shape that is long in the front-rear direction.
- the surface 21 faces upwards.
- Surface 21 has a rake face 26 .
- the rake face 26 is arranged at the front-rear end of the surface 21 .
- the rake face 26 is located on the portion of the surface 21 adjacent the cutting edge 24 .
- the rake face 26 is connected with the cutting edge 24 .
- the back surface 22 has a polygonal shape, and in this embodiment, has a hexagonal shape that is long in the front-rear direction.
- the back surface 22 faces downward.
- the back surface 22 has a seating surface 27 .
- the seating surface 27 is arranged in an intermediate portion of the back surface 22 located between both ends in the front-rear direction.
- the seating surface 27 is planar and extends in a direction perpendicular to the insert central axis C2.
- the seating surface 27 protrudes from the portion of the back surface 22 other than the seating surface 27 in the axial direction of the insert.
- the seating surface 27 contacts the bottom wall 5 a of the insert mounting seat 5 .
- the outer peripheral surface 23 faces outward in the radial direction of the insert and extends in the circumferential direction of the insert.
- the outer peripheral surface 23 has a flank 28 .
- the flank 28 is arranged at the end of the outer peripheral surface 23 in the axial direction of the insert.
- the flank 28 is arranged on a portion of the outer peripheral surface 23 adjacent to the cutting edge 24 .
- the flank 28 is connected with the cutting edge 24 .
- the outer peripheral surface 23 has six planar side walls 23a, 23b, 23c arranged in the circumferential direction of the insert. Specifically, the outer peripheral surface 23 includes a pair of front side walls 23a facing forward, a pair of rear side walls 23b facing rearward, and a pair of side walls 23a and 23b positioned between the front side walls 23a and 23b and facing sideways. and sidewalls 23c.
- the front wall 23a is arranged on a portion of the outer peripheral surface 23 facing forward.
- the pair of front side walls 23a are arranged side by side in the circumferential direction of the insert.
- a convex curved surface portion that protrudes forward is arranged between the pair of front side walls 23a.
- the rear side wall 23b is arranged on a portion of the outer peripheral surface 23 facing rearward.
- the pair of rear side walls 23b are arranged side by side in the circumferential direction of the insert.
- a convex curved surface portion that protrudes rearward is arranged between the pair of rear side walls 23b.
- the lateral side wall 23c is arranged on a portion of the outer peripheral surface 23 facing the side.
- the pair of lateral side walls 23c face opposite directions in the left-right direction (lateral direction). That is, one side wall 23c of the pair of side walls 23c faces left, and the other side wall 23c faces right.
- the outer peripheral surface 23 has a pressed surface 23d and a restrained surface 23e. That is, the cutting insert 2 has a pressed surface 23d and a constrained surface 23e.
- the pressed surface 23d is planar. That is, in the present embodiment, the pressed surface 23d is composed of one plane portion.
- a pair of pressed surfaces 23 d are provided on the outer peripheral surface 23 .
- the pair of pressed surfaces 23d are arranged on the pair of lateral side walls 23c. That is, the pressed surface 23d is arranged at least on the side wall 23c. That is, the pressed surface 23d is arranged at least on a portion of the outer peripheral surface 23 facing the side.
- the constrained surface 23e is planar.
- a pair of restrained surfaces 23 e are provided on the outer peripheral surface 23 .
- the pair of constrained surfaces 23e are arranged on the pair of rear side walls 23b. That is, the restrained surface 23e is arranged on a portion of the outer peripheral surface 23 facing rearward.
- the constrained surface 23e is arranged in a portion of the outer peripheral surface 23 located behind the pressed surface 23d. In this embodiment, the pair of constrained surfaces 23e is arranged between the pair of pressed surfaces 23d in the insert circumferential direction.
- the cutting edge 24 is arranged at least at the front end of the cutting insert 2 .
- the cutting edge 24 is arranged at the ridgeline where the rake face 26 and the flank face 28 are connected.
- the cutting edge 24 has a convex V shape protruding forward.
- the cutting edge 24 has a corner edge portion 24a and a straight edge portion 24b.
- the corner edge portion 24a has a convex curved shape that bulges forward.
- the straight blade portion 24b is connected to the end portion of the corner blade portion 24a and extends straight.
- the blade length of the straight blade portion 24b is longer than the blade length of the corner blade portion 24a.
- a pair of straight blade portions 24b are connected to both end portions in the blade length direction in which the corner blade portion 24a extends. That is, the cutting edge 24 is provided with a pair of straight blade portions 24b.
- the angle formed between the pair of straight blade portions 24b is, for example, 80° when viewed from the insert axial direction (vertical direction).
- the cutting insert 2 has a shape that is symmetrical with the front and back reversed in the axial direction of the insert, that is, the plate thickness direction. Moreover, the cutting insert 2 has a front-rear inversion symmetrical shape in the front-rear direction. Therefore, the cutting insert 2 is provided with a plurality of cutting edges 24 . Specifically, a total of four cutting edges 24 are provided, two at both ends of the front surface 21 in the front-rear direction and two at both ends of the back surface 22 in the front-rear direction.
- the cutting edge 24 positioned at the front end of the cutting insert 2 is arranged to protrude forward from the supporter 3 .
- a rear end portion of the cutting insert 2 is located forward of the central axis C1 of the supporter 3 .
- the supporter 3 is made of metal such as steel.
- the supporter 3 is lower in hardness and higher in toughness than the cutting insert 2 and is made of an inexpensive material.
- the supporter 3 holds the outer peripheral surface 23 of the cutting insert 2 from the side and rear. In this embodiment, the supporter 3 has a symmetrical shape.
- the supporter 3 has a pair of plate surfaces 3a and 3b and an outer peripheral surface 3c.
- the pair of plate surfaces 3a and 3b face up and down.
- One plate surface (front surface) 3a of the pair of plate surfaces 3a and 3b faces upward.
- One plate surface 3a is planar and extends in a direction perpendicular to the central axis C1.
- the other plate surface (rear surface) 3b faces downward.
- the other plate surface 3b is planar and extends in a direction perpendicular to the central axis C1.
- the surface 21 of the cutting insert 2 is arranged to protrude upward from one plate surface 3a.
- the seating surface 27 of the back surface 22 of the cutting insert 2 is arranged at the same position as the other plate surface 3 b in the vertical direction, that is, flush with the back surface 3 b of the supporter 3 .
- the seating surface 27 and the back surface 3b contact the bottom wall 5a of the insert mounting seat 5, that is, the upper surface of the seat member 51.
- the outer peripheral surface 3c is connected to the pair of plate surfaces 3a and 3b at both ends in the vertical direction.
- the outer peripheral surface 3c has four side surfaces 3d and 3e arranged in the circumferential direction (supporter circumferential direction).
- the four side surfaces 3d and 3e are arranged on the four side portions of the supporter 3 which has a substantially rectangular shape when viewed from above and below.
- the outer peripheral surface 3c has a pair of front side surfaces 3d facing forward and a pair of rear side surfaces 3e facing rearward.
- the front side surface 3d is arranged on a portion of the outer peripheral surface 3c facing forward.
- the front side surface 3d is planar.
- the pair of front side surfaces 3d are arranged side by side in the circumferential direction.
- a pocket 33 is opened between the pair of front side surfaces 3d.
- the angle formed between the pair of front side surfaces 3d is, for example, 80° when viewed from above and below.
- the rear side surface 3e is arranged on a rearward facing portion of the outer peripheral surface 3c.
- the pair of rear side surfaces 3e are arranged side by side in the circumferential direction.
- each rear side surface 3e has two planar portions 3f and 3g arranged in the circumferential direction.
- one flat portion 3f arranged at the rear portion of the rear side surface 3e is the body side flat portion 3f
- the other flat portion 3g arranged at the front portion of the rear side surface 3e. is the arm-side flat portion 3g. That is, a pair of body-side flat portions 3f and a pair of arm-side flat portions 3g are provided on the outer peripheral surface 3c.
- the angle formed between the pair of main body side plane portions 3f is, for example, 80° when viewed from above.
- the angle formed between the pair of arm-side flat portions 3g when viewed from the vertical direction is, for example, 86°. That is, the angle formed between the pair of arm-side flat portions 3g is larger than the angle formed between the pair of body-side flat portions 3f when viewed from the vertical direction. Therefore, the arm-side flat portion 3g protrudes outside the virtual extension line L of the main-body-side flat portion 3f when viewed from above in the vertical direction.
- the angle formed between the pair of arm-side flat portions 3g is larger than the angle formed between the pair of side walls 5b of the insert mounting seat 5 when viewed from the vertical direction.
- the supporter 3 has a supporter main body 31, gripping arms 32, pockets 33, and slits .
- the supporter main body 31 is positioned in the central portion and rear portion of the supporter 3 .
- the supporter main body 31 extends in the front-rear direction.
- the rear portion of the supporter main body 31 has a substantially triangular columnar shape.
- the supporter main body 31 is provided with a pair of main body side flat portions 3f.
- the pair of main-body-side flat portions 3f are arranged on the wall portion of the supporter main body 31 facing rearward.
- the supporter main body 31 has a through hole 31a and a restraining surface 31b.
- the through hole 31 a and the restraining surface 31 b are arranged in the front portion of the supporter body 31 .
- the through hole 31a is positioned on the central axis C1 of the supporter 3 and penetrates the supporter main body 31 in the plate thickness direction (vertical direction). That is, the through hole 31a penetrates the supporter 3 in the vertical direction.
- the through hole 31a has a circular hole shape extending in the plate thickness direction and opening to the pair of plate surfaces 3a and 3b.
- the central axis of the through hole 31a is arranged coaxially with the central axis C1 of the supporter 3 .
- the through-hole 31a of the supporter 3 has the same inner diameter as that of a through-hole of a square plate-shaped cutting insert (rhombic insert) conforming to general ISO standards. As shown in FIG.
- a protrusion 6e of a clamp piece 6a of the clamp member 6, which will be described later, is inserted into and locked in the through hole 31a from above the through hole 31a. That is, a part of the clamp member 6 is inserted and locked in the through hole 31a.
- the restraining surface 31b is arranged on the wall of the supporter body 31 facing forward.
- the restraining surface 31b is a square plane.
- a pair of restraining surfaces 31b are provided.
- the pair of restraint surfaces 31b are arranged side by side in the circumferential direction.
- the pair of restraint surfaces 31b are opposed to each other in the left-right direction.
- one of the restraint surfaces 31b on the left side is located on the left side as it goes forward.
- the other restraint surface 31b on the right side is located on the right side as it goes forward. That is, the pair of restraining surfaces 31b are separated from each other in the left-right direction as they go forward.
- the pair of constrained surfaces 31b are in contact with the pair of constrained surfaces 23e of the cutting insert 2 .
- the grip arm 32 protrudes from the supporter main body 31 in a direction perpendicular to the plate thickness direction.
- the gripping arm 32 protrudes laterally from a substantially central portion in the front-rear direction of the side wall portion of the supporter body 31, extends in the circumferential direction, and curves forward.
- the grasping arm 32 extends so as to surround the substantially cylindrical front portion of the supporter body 31 from the radially outer side.
- a front end portion of the grasping arm 32 protrudes forward from the supporter body 31 . That is, the grasping arm 32 includes a portion located forward of the supporter main body 31 .
- the grasping arm 32 is elastically deformable with respect to the supporter main body 31 .
- the gripping arm 32 has an arm-side flat portion 3g and a front side surface 3d.
- the arm-side flat portion 3g and the front side surface 3d are arranged on a wall portion of the grasping arm 32 facing radially outward.
- a pair of gripping arms 32 are provided in this embodiment.
- One of the left gripping arms 32 of the pair of gripping arms 32 protrudes leftward from the leftward facing wall of the supporter body 31 and extends forward in the circumferential direction.
- the other gripping arm 32 on the right side of the pair of gripping arms 32 protrudes rightward from the rightward facing wall of the supporter body 31 and extends forward along the circumferential direction.
- the grip arm 32 has a pressing surface 32a.
- the pressing surface 32a is arranged on a sideward facing wall of the front end of the gripping arm 32 .
- the pressing surface 32a is a square plane. In this embodiment, the surface area of the pressing surface 32a is larger than the surface area of the restraining surface 31b.
- the pressing surfaces 32a are provided on the pair of gripping arms 32, respectively. That is, a pair of pressing surfaces 32a are provided.
- the pair of pressing surfaces 32a face each other in the left-right direction. Of the pair of pressing surfaces 32a, one pressing surface 32a provided on the left gripping arm 32 faces rightward. Of the pair of pressing surfaces 32a, the other pressing surface 32a provided on the right gripping arm 32 faces leftward.
- Each pressing surface 32a extends in a direction substantially perpendicular to the left-right direction. That is, the pair of pressing surfaces 32a are substantially parallel to each other.
- the pair of pressing surfaces 32 a contacts the pair of pressed surfaces 23 d of the cutting insert 2 .
- the pressing surface 32a of the gripping arm 32 presses the pressed surface 23d of the cutting insert 2 from the side. That is, the gripping arm 32 presses the cutting insert 2 .
- the cutting insert 2 is sandwiched between the pair of pressing surfaces 32a.
- the pocket 33 is recessed backward from the front end of the supporter 3 .
- the pocket 33 is opened in the forward-facing wall of the supporter 3 and extends in the front-rear direction. Further, the pocket 33 penetrates the supporter 3 in the plate thickness direction and opens to the pair of plate surfaces 3a and 3b.
- the pocket 33 is a storage space for the cutting insert 2 defined by a pair of restraining surfaces 31b and a pair of pressing surfaces 32a.
- a pocket 33 is positioned between the pair of gripping arms 32 .
- the rear end of the pocket 33 and the front end of the through hole 31a are connected to each other. That is, the pocket 33 and the through hole 31a communicate with each other in the front-rear direction.
- the slit 34 penetrates the supporter 3 in the plate thickness direction and opens to the pair of plate surfaces 3a and 3b. That is, the slits 34 are opened on both sides of the supporter 3 in the plate thickness direction.
- the slit 34 is arranged between the supporter body 31 and the gripping arm 32 . Specifically, the slit 34 is arranged between the substantially cylindrical front portion of the supporter body 31 and the grasping arm 32 so as to divide them in the radial direction.
- the slit 34 extends around the central axis C1 of the supporter 3 when viewed from the plate thickness direction as shown in FIG. 3A.
- the slit 34 has an arc shape when viewed in the plate thickness direction.
- the slit 34 extends around the through hole 31 a and opens into the pocket 33 .
- the slit 34 has a pocket opening 34a opening into the pocket 33.
- a pocket opening 34 a is located at the front end of the slit 34 .
- Pocket opening 34a is located between restraining surface 31b and pressing surface 32a.
- the pocket opening 34a faces the ridge between the lateral side wall 23c and the rear side wall 23b of the outer peripheral surface 23 of the cutting insert 2. As shown in FIG.
- a pair of slits 34 are provided in this embodiment.
- one of the slits 34 on the left side has a wall portion facing the left side (outside in the radial direction) of the front portion of the supporter body 31 and the right side (inside in the radial direction) of one of the left gripping arms 32 . and the facing wall.
- the pocket opening 34a of one of the slits 34 is arranged between the one restraining surface 31b on the left side and the one pressing surface 32a on the left side, and opens to the pocket 33 toward the right side.
- the other slit 34 on the right side is formed by connecting a wall portion facing the right side (outside in the radial direction) of the front portion of the supporter body 31 and the left side (inside in the radial direction) of the other gripping arm 32 on the right side. and the facing wall.
- a pocket opening 34a of the other slit 34 is arranged between the other restraining surface 31b on the right side and the other pressing surface 32a on the right side, and opens to the pocket 33 toward the left side.
- the clamping member 6 fixes at least the supporter 3 of the cutting insert clamping structure 10 to the insert mounting seat 5 .
- the clamp member 6 has a clamp piece 6a and a clamp screw 6b.
- the clamp piece 6a is arranged above the portion of the top surface 41 of the tool body 4 located at the first end portion 4a.
- the clamp piece 6a extends in the front-rear direction.
- a front end portion of the clamp piece 6 a is positioned above the insert mounting seat 5 .
- the clamp piece 6a has a screw insertion hole 6c, a slide surface 6d, and a protrusion 6e.
- the screw insertion hole 6c vertically penetrates the clamp piece 6a.
- the screw insertion hole 6c is arranged in an intermediate portion of the clamp piece 6a located between both ends in the front-rear direction.
- the slide surface 6d is arranged at the rear end of the clamp piece 6a and faces downward.
- the slide surface 6d has a planar shape that slopes downward toward the rear.
- the slide surface 6d is in slidable contact with the inclined surface 41a of the tool body 4. As shown in FIG.
- the projection 6e is arranged at the front end of the clamp piece 6a and protrudes downward from the lower surface of the clamp piece 6a.
- the projecting portion 6e has a columnar shape extending in the vertical direction.
- the protrusion 6e is inserted into the through hole 31a of the supporter body 31 from above. A rearward facing portion of the outer peripheral surface of the protrusion 6e can come into contact with the inner peripheral surface of the through hole 31a.
- the clamp screw 6b is inserted into the screw insertion hole 6c from above and screwed into a screw hole that opens to the top surface 41 of the tool body 4.
- the slide surface 6d slides on the inclined surface 41a, and the clamp piece 6a is pulled backward while moving downward.
- the protrusion 6e pulls the supporter main body 31 rearward through the inner peripheral surface of the through hole 31a.
- the portion positioned around the protrusion 6e contacts the upper surface of the supporter body 31, that is, a portion of the surface 3a of the supporter 3 from above, and the supporter body 31 is moved. press down.
- the clamp member 6 is locked to the supporter main body 31 .
- the arm-side flat portions 3g of the pair of gripping arms 32 are pressed against the pair of side walls 5b of the insert mounting seat 5, and the gripping arms 32 are elastically deformed. Let me. As a result, the pressing surfaces 32 a of the pair of gripping arms 32 press the pair of pressed surfaces 23 d of the cutting insert 2 from the sides, and the cutting insert 2 is clamped between the pair of gripping arms 32 .
- the supporter 3 holds the cutting insert 2, so that the cutting insert 2 made of an expensive hard material such as cemented carbide can be removed.
- the outer shape can be kept small. Therefore, tool costs can be reduced.
- the gripping arm 32 is elastically deformed when the clamping structure 10 for the cutting insert, that is, the cutting insert 2 and the supporter 3 are clamped to the insert mounting seat 5 by the clamp member 6 . Specifically, by locking the clamp member 6 to the supporter main body 31 and applying a backward pulling force to the clamp member 6 , the arm-side flat portion 3 g of the gripping arm 32 is moved to the side wall 5 b of the insert mounting seat 5 . to elastically deform the gripping arm 32 . The pressing surface 32 a of the gripping arm 32 presses the pressed surface 23 d of the cutting insert 2 due to the elastic deformation of the gripping arm 32 .
- the gripping arm 32 is elastically deformed, and the pressing surface 32a of the gripping arm 32 presses against the cutting insert 2. It presses the pressed surface 23d.
- the restraining surface 31b and the pressing surface 32a are separated by the slit 34 positioned between them and are relatively displaceable. Therefore, the restraining surface 31b of the supporter 3 and the restrained surface 23e of the cutting insert 2, and the pressing surface 32a of the supporter 3 and the pressing surface 23d of the cutting insert 2 can be brought into stable contact with each other. That is, the constrained surface 23e and the pressed surface 23d of the cutting insert 2 can be stably pressed by the restraining surface 31b and the pressing surface 32a of the supporter 3 .
- the cutting insert 2 can be stably held while the cutting insert 2 is made compact and the cost is reduced.
- the cutting insert 2 has a shape that is symmetrical about the front and back in the thickness direction, and a shape that is symmetrical about the front and back in the front-rear direction. In this case, since at least four cutting edges 24 are arranged in one cutting insert 2, the tool life of the cutting insert 2 can be extended.
- the cutting insert 2 has a hexagonal prism shape
- the constrained surface 23e is arranged on the rear side wall 23b of the outer peripheral surface 23
- the pressed surface 23d is arranged on at least the lateral side wall 23c of the outer peripheral surface 23. placed.
- the supporter 3 can hold the rear side wall 23 b and the lateral side wall 23 c of the outer peripheral surface 23 of the cutting insert 2 . The holding state of the cutting insert 2 by the supporter 3 is stabilized.
- a part of the clamp member 6 (projection 6e) is inserted into the through hole 31a of the supporter main body 31 and locked.
- the clamp member 6 can be locked to the supporter main body 31 with a simple structure.
- the supporter 3 has a rectangular plate shape, and the central axis of the through hole 31a is arranged coaxially with the central axis C1 of the supporter 3 .
- the cutting insert clamping structure 10 of the present embodiment is applied to an existing indexable cutting tool in which a square plate-shaped cutting insert conforming to general ISO standards is attached to an insert mounting seat. It is possible. That is, the product of the present invention can be mounted on the insert mounting seat of the tool body of the conventional product, and versatility is enhanced.
- the slit 34 extends around the central axis C1 of the supporter 3 when viewed in the plate thickness direction.
- the amount of displacement of the pressing surface 32a when the gripping arm 32 is elastically deformed, particularly the amount of lateral displacement, can be ensured to be large, and the cutting insert 2 can be stably held by the gripping arm 32 .
- the slit 34 has an arc shape when viewed in the plate thickness direction. In this case, the occurrence of stress concentration in a part of the slit 34 is suppressed, and the breakage of the supporter 3 originating from the slit 34 is suppressed.
- a pair of gripping arms 32 are provided, and the pocket 33 is arranged between the pair of gripping arms 32 .
- the elastic deformation of the pair of gripping arms 32 secures a large amount of relative displacement between the pressing surfaces 32a of the pair of gripping arms 32 . Therefore, it is easy to attach and detach the cutting insert 2 to and from the pocket 33 .
- the cutting insert 2 may be unintentionally dropped or lost when attaching/detaching it to/from the supporter 3. Such drop or loss is suppressed because the detachability is enhanced.
- the pocket 33 and the through hole 31a communicate with each other.
- the front end portion (part of the peripheral wall) of the substantially cylindrical front portion of the supporter main body 31 is divided in the left-right direction by the pocket 33 and the through hole 31a. Since the pair of restraining surfaces 31b can be individually displaced, the tight contact between each restraining surface 31b and each restrained surface 23e can be further enhanced.
- the cutting insert 2 has the shape of a hexagonal column, but the shape is not limited to this.
- the cutting insert 2 may have, for example, an octagonal prism shape other than a hexagonal prism shape.
- the cutting insert 2 is an example of a double-sided type having a symmetrical inverted shape, the present invention is not limited to this.
- the cutting insert 2 may be of a single-sided type that is not symmetrical.
- the clamp member 6 has the clamp piece 6a and the clamp screw 6b
- the present invention is not limited to this.
- the clamp member may have, for example, an L-shaped clamp lever.
- the clamp lever is inserted into the through-hole 31a from the lower side of the supporter 3 and locked, and exerts a backward pulling force on the supporter 3 .
- FIG. 8 is a perspective view showing a clamping structure 60 for a cutting insert according to the first modification of the first embodiment.
- this first modification one gripping arm 32 and one slit 34 are provided in the supporter 3 .
- the supporter 3 has one of the pair of gripping arms 32 described in the first embodiment on the left side, and the other gripping arm on the right side. It does not have an arm 32. Further, the supporter 3 has one slit 34 on the left side of the pair of slits 34 and does not have the other slit 34 on the right side.
- the supporter 3 of the first modified example has a fixed arm 35 fixed to the supporter body 31 instead of the gripping arm 32 on the other side and the slit 34 on the other side.
- the fixed arm 35 is arranged on the right side of the supporter body 31 and connected to the supporter body 31 .
- a front end portion of the fixed arm 35 protrudes forward from the supporter main body 31 . That is, the fixed arm 35 includes a portion located forward of the supporter main body 31 .
- the fixed arm 35 has a support surface 35a.
- the support surface 35 a is arranged at a portion of the fixed arm 35 that protrudes forward from the supporter main body 31 .
- the support surface 35a is arranged on a sideward facing wall of the front end of the fixed arm 35 .
- the support surface 35a is a square plane. In the first modified example, the surface area of the support surface 35a is larger than the surface area of the restraint surface 31b.
- the support surface 35a extends in a direction substantially perpendicular to the left-right direction.
- the support surface 35a of the fixed arm 35 faces the pressing surface 32a of the gripping arm 32 in the left-right direction.
- the support surface 35a and the pressing surface 32a are substantially parallel to each other.
- the support surface 35a of the fixed arm 35 supports the pressed surface 23d of the cutting insert 2 from the side. That is, the fixed arm 35 supports the cutting insert 2 . More specifically, the support surface 35a contacts the pressed surface 23d facing the right side of the cutting insert 2 . Further, the pressing surface 32a of the gripping arm 32 contacts the pressed surface 23d of the cutting insert 2 facing leftward.
- the cutting insert 2 is sandwiched between the pressing surface 32a and the supporting surface 35a.
- a pocket 33 is located between the gripping arm 32 and the fixed arm 35 .
- Pocket 33 is defined by a pair of restraining surface 31b, pressing surface 32a and supporting surface 35a.
- FIG. 9 is a perspective view showing a clamping structure 70 for a cutting insert according to the second modification of the first embodiment.
- the central axis of the through-hole 31 a of the supporter body 31 is located behind the central axis C1 of the supporter 3 .
- the through hole 31a has a tapered surface at its upper opening, the diameter of which increases toward the upper side.
- the pocket 33 and the through hole 31a are not in communication with each other. Therefore, the pair of restraining surfaces 31b are connected to each other in the left-right direction.
- the clamp member 6 has a countersunk screw 6f instead of the clamp piece 6a and the clamp screw 6b.
- the countersunk screw 6f has a tapered surface on the lower surface of its head that increases in diameter toward the upper side.
- a screw hole is formed in a portion of the top surface 41 of the tool body 4 that is located at the first end portion 4a. The screw hole extends vertically. The central axis of the screw hole is located behind the central axis of the through hole 31a.
- a countersunk screw 6f is inserted from the upper side of the through hole 31a and screwed into the screw hole. Then, the rearward-facing portion of the tapered surface of the head of the countersunk screw 6f presses the forward-facing portion of the tapered surface of the opening of the through-hole 31a, thereby applying a backward pulling force to the supporter 3. be.
- the supporter 3 is pulled backward by the clamp member 6, the arm-side flat portions 3g of the pair of gripping arms 32 are pressed against the pair of side walls 5b of the insert mounting seat 5, and the gripping arms 32 are elastically deformed. .
- the 10 to 12 show a cutting insert clamp structure 80, a cutting insert 2 and a supporter 3 of a third modification of the first embodiment.
- the supporter 3 is provided with one gripping arm 32 and one slit 34 in the same manner as in the above-described first modification. Therefore, the same effects as those of the first modified example described above can be obtained.
- the third modification differs from the first embodiment and the first modification described above in the following points.
- the length of one side of the hexagonal outer peripheral surface 23 of the cutting insert 2 corresponding to the side wall 23c when viewed from the insert axial direction is is longer than the length of the other side corresponding to the rear wall 23b.
- the constrained surface 23e of the cutting insert 2 is arranged only on the rear side wall 23b, and the pressed surface 23d is arranged only on the side wall 23c.
- the pressing surface 32a of the gripping arm 32 is composed of one plane portion.
- the length of one side of the hexagonal outer peripheral surface 23 of the cutting insert 2 corresponding to the lateral side wall 23c when viewed from the insert axial direction is equal to the length of the rear side wall. shorter than the length of the other side corresponding to 23b.
- the constrained surface 23e of the cutting insert 2 is arranged on the rear portion of the rear wall 23b, and the pressed surface 23d is arranged over the lateral wall 23c and the front portion of the rear wall 23b. be done. That is, in the third modification, the pressed surface 23d has a portion 23da arranged on the side wall 23c and a portion 23db arranged on the rear side wall 23b. That is, the pressed surface 23d has two plane portions.
- the pressing surface 32a of the gripping arm 32 has a concave V shape when viewed from the plate thickness direction of the supporter 3. As shown in FIGS. 11 and 12, the pressing surface 32a includes a front pressing surface portion 32aa that contacts a portion 23da of the pressed surface 23d that is disposed on the lateral side wall 23c, and a rear side wall 23b of the pressed surface 23d. and a rear pressing surface portion 32ab that contacts the portion 23db to be pressed.
- the front pressing surface portion 32aa and the rear pressing surface portion 32ab each have a planar shape.
- the front pressing surface portion 32aa may be referred to as the first planar portion 32aa
- the rear pressing surface portion 32ab may be referred to as the second planar portion 32ab.
- a slit 34 separates one of the pair of restraint surfaces 31b from the restraint surface 31b arranged on the left side and the rear pressing surface portion 32ab. Also in this third modification, the surface area of the entire pressing surface 32a is larger than the surface area of one restraining surface 31b.
- the gripping arm 32 has a recessed relief portion 32b located between the front pressing surface portion 32aa and the rear pressing surface portion 32ab on the sideward wall portion of the front end portion of the gripping arm 32.
- the relief portion 32b has a groove shape extending in the plate thickness direction.
- the relief portion 32b faces a ridge line portion of the outer peripheral surface 23 of the cutting insert 2 where the lateral side wall 23c and the rear side wall 23b are connected with a gap therebetween.
- the support surface 35a of the fixed arm 35 has a concave V shape when viewed from the plate thickness direction of the supporter 3.
- the support surface 35a includes a front support surface portion 35aa that contacts a portion 23da of the pressed surface 23d that is arranged on the lateral side wall 23c, and a rear support surface portion that contacts a portion 23db of the pressed surface 23d that is arranged on the rear side wall 23b. 35ab and .
- the front support surface portion 35aa and the rear support surface portion 35ab each have a planar shape.
- the front support surface portion 35aa may be called the third plane portion 35aa
- the rear support surface portion 35ab may be called the fourth plane portion 35ab.
- the other of the pair of restraint surfaces 31b arranged on the right side and the rear support surface portion 35ab are connected to each other and arranged side by side on one plane. Also in this third modification, the surface area of the entire support surface 35a is larger than the surface area of one restraining surface 31b.
- the fixed arm 35 has a recessed recessed portion 35b located between the front support surface portion 35aa and the rear support surface portion 35ab on the side wall portion of the front end portion of the fixed arm 35.
- the relief portion 35b has a groove shape extending in the plate thickness direction.
- the relief portion 35b faces a ridge line portion of the outer peripheral surface 23 of the cutting insert 2 where the lateral side wall 23c and the rear side wall 23b are connected with a gap therebetween.
- FIG. 13 to 23 a clamping structure 20 for a cutting insert according to a second embodiment of the present invention and an indexable cutting tool 11 having the same will be described with reference to FIGS. 13 to 23.
- FIG. 13 Note that, in this embodiment, the same configurations as those of the first embodiment and the first to third modifications described above may be given the same names and symbols, and the description thereof may be omitted. Also, the definition of the direction is the same as in the above-described embodiment and the like unless otherwise specified.
- the indexable cutting tool 11 of the present embodiment differs in tool hand from the indexable cutting tool 1 described in the first embodiment. Specifically, while the indexable cutting tool 1 of the first embodiment is right-handed, the indexable cutting tool 11 of the second embodiment is left-handed.
- the indexable cutting tool 11 of this embodiment differs from the indexable cutting tool 1 described in the first embodiment above in that the tool body 4, the pocket 33, the through hole 31a, the cutting insert 2, and the clamp member 6 are removed. etc. are different.
- the insert mounting seat 5 opens to the top surface 41 , the other side surface 44 and the tip surface 45 at the first end 4 a of the tool body 4 , that is, the tip.
- the insert mounting seat 5 is recessed from the top surface 41 of the tool body 4 , the other side surface 44 and the tip surface 45 .
- the tool body 4 has a female screw hole 46, a lever accommodating portion 47, and a washer member 48.
- the female screw hole 46 is arranged at the first end 4 a of the tool body 4 .
- the female screw hole 46 is located on the rear end side of the insert mounting seat 5 and arranged adjacent to the insert mounting seat 5 .
- the female screw hole 46 extends substantially vertically, and more specifically, extends substantially parallel to the central axis C ⁇ b>1 of the supporter 3 . Both ends of the female screw hole 46 are open to the top surface 41 and the bottom surface 42 of the tool body 4 .
- the female screw hole 46 has a female screw portion on its inner peripheral surface.
- the lever accommodating portion 47 is a recess or hole arranged inside the first end portion 4 a of the tool body 4 .
- the lever accommodating portion 47 accommodates a portion of a clamp lever 61 of the clamp member 6, which will be described later.
- the lever accommodating portion 47 extends in a radial direction perpendicular to the central axis C1. Specifically, the lever accommodating portion 47 extends substantially in the tool axis direction.
- the tip end of the lever accommodating portion 47 overlaps with the seat hole 51a of the seat member 51 and the through hole 31a of the supporter 3 when viewed from above and below.
- the tip of the lever housing portion 47 communicates with the through hole 31 a of the supporter 3 through the seat hole 51 a of the seat member 51 .
- a rear end portion of the lever accommodating portion 47 is connected to the female screw hole 46 .
- a rear end portion of the lever accommodating portion 47 communicates with the female screw hole 46 .
- the washer member 48 has, for example, a half-cylindrical shape.
- the washer member 48 is made of a material softer than the sheet member 51, and is made of metal such as steel.
- the washer member 48 extends vertically around the supporter central axis C1.
- the washer member 48 is arranged over the seat hole 51 a and the tip of the lever accommodating portion 47 .
- the washer member 48 is arranged at least at a portion of the seat hole 51a and the lever accommodating portion 47 located on the distal end side of the central axis C1.
- the washer member 48 suppresses contact between a clamp lever 61 (to be described later) and the sheet member 51 .
- the cutting insert 2 of this embodiment has a trigon-shaped hexagonal prism shape (hexagonal plate shape) centering on the insert center axis C2.
- the cutting insert 2 has three acute-angled corners and three obtuse-angled corners arranged alternately around the insert center axis C2 on its outer peripheral portion. That is, the cutting insert 2 has a total of six corners on its outer circumference.
- the cutting insert 2 has an insert through-hole 25 that vertically penetrates the cutting insert 2 .
- the insert through-hole 25 has a circular hole shape centering on the insert central axis C2 and extends in the vertical direction. Both ends of the insert through-hole 25 open to the front surface 21 and the rear surface 22 of the cutting insert 2 .
- the surface 21 has a polygonal shape, and in this embodiment, it has a trigon-shaped hexagonal shape.
- the rake face 26 is located at least at the sharp corners of the surface 21 .
- the back surface 22 has a polygonal shape, and in this embodiment, it has a trigon-shaped hexagonal shape.
- Back surface 22 has a plurality of seating surfaces 27 .
- the plurality of seating surfaces 27 are arranged at positions that are rotationally symmetrical to each other about the insert central axis C2 when viewed in the axial direction of the insert. That is, the plurality of seating surfaces 27 are arranged at equal pitches in the circumferential direction of the insert.
- three seating surfaces 27 are provided on the back surface 22 .
- Each seating surface 27 is arranged on an imaginary straight line (not shown) connecting the insert central axis C2 and each acute corner when viewed from the insert axial direction.
- the seating surface 27 is arranged radially outside the insert through-hole 25 on the back surface 22 .
- the seating surface 27 is arranged adjacent to the insert through hole 25 .
- the seating surface 27 extends in the insert radial direction when viewed from the insert axial direction. That is, the plurality of seating surfaces 27 radially extend around the insert central axis C2.
- the seating surface 27 protrudes in the axial direction of the insert more than the portion of the back surface 22 other than the seating surface 27 .
- Each seating surface 27 contacts the bottom wall 5 a of the insert mounting seat 5 when the cutting insert 2 is mounted on the insert mounting seat 5 .
- the constrained surface 23e of the cutting insert 2 is arranged on the rear portion of the rear side wall 23b.
- the pressed surface 23d of the cutting insert 2 is arranged over the lateral side wall 23c and the front portion of the rear side wall 23b. That is, the pressed surface 23d has a portion 23da arranged on the side wall 23c and a portion 23db arranged on the rear side wall 23b. That is, the pressed surface 23d has two plane portions.
- the cutting edge 24 is arranged at the sharp corner of the cutting insert 2 .
- the cutting edge 24 has a corner edge portion 24a and a pair of straight edge portions 24b.
- the angle formed between the pair of straight blade portions 24b when viewed from the insert axial direction (vertical direction) is, for example, 80°.
- the cutting insert 2 has a shape that is symmetrical upside down in the axial direction of the insert, that is, in the vertical direction. Moreover, the cutting insert 2 has a 120° rotationally symmetrical shape about the center axis C2 of the insert. Therefore, the cutting insert 2 is provided with a plurality of cutting edges 24 . Specifically, a total of six cutting edges 24 are provided, three at each acute-angled corner on the front surface 21 and three at each acute-angled corner on the back surface 22 .
- the supporter 3 has a supporter body 31, gripping arms 32, pockets 33, slits 34, and fixed arms .
- the pressing surface 32a of the gripping arm 32 has a front pressing surface portion 32aa and a rear pressing surface portion 32ab.
- the front pressing surface portion 32aa extends rightward toward the front when viewed from the top and bottom direction.
- the front pressing surface portion 32aa contacts a portion 23da of the pressed surface 23d of the cutting insert 2 that is arranged on the side wall 23c.
- the rear pressing surface portion 32ab contacts a portion 23db of the pressed surface 23d of the cutting insert 2 that is arranged on the rear side wall 23b.
- the support surface 35a of the fixed arm 35 has a front support surface portion 35aa and a rear support surface portion 35ab.
- the front support surface portion 35aa extends leftward as it goes forward when viewed in the vertical direction.
- the front supporting surface portion 35aa contacts a portion 23da of the pressed surface 23d of the cutting insert 2 that is arranged on the side wall 23c.
- the rear support surface portion 35ab contacts a portion 23db of the pressed surface 23d of the cutting insert 2 that is arranged on the rear side wall 23b.
- the horizontal distance between the front pressing surface portion 32aa of the gripping arm 32 and the front supporting surface portion 35aa of the fixed arm 35 decreases toward the front. Therefore, the cutting insert 2 held in the pocket 33 cannot be extracted forward. In this embodiment, the cutting insert 2 can be extracted upward from the pocket 33 .
- the through hole 31a has a contacted portion 31c and a retaining portion 31d.
- the contacted portion 31c is arranged on the inner peripheral surface of the through hole 31a, and a part of the clamp member 6 is in contact with it.
- the contacted portion 31c is arranged at least at the rear end portion of the inner peripheral surface of the through hole 31a.
- the contacted portion 31c is arranged on the inner peripheral surface of the through hole 31a over substantially the entire circumference in the circumferential direction. That is, the contacted portion 31c has a substantially circular hole shape centered on the central axis C1.
- the contacted portion 31c is arranged in a portion other than the lower end portion of the through hole 31a. In the present embodiment, the contacted portion 31c is arranged in the intermediate portion between both ends in the vertical direction of the through hole 31a.
- the retaining part 31d is arranged below the contacted part 31c on the inner peripheral surface of the through hole 31a, and protrudes further into the through hole 31a than the contacted part 31c. That is, the retaining portion 31d protrudes radially inward from the contacted portion 31c.
- the retaining portion 31d is arranged at least at the rear end portion of the inner peripheral surface of the through hole 31a. Therefore, the retaining portion 31d protrudes at least forward from the contacted portion 31c.
- the retaining portion 31d is arranged on the inner peripheral surface of the through hole 31a over substantially the entire circumference in the circumferential direction. That is, the retaining portion 31d has a substantially circular ring shape centered on the central axis C1.
- the retaining portion 31d is arranged at least at the lower end portion of the through hole 31a.
- the inner diameter dimension (diameter) of the retainer portion 31d of the through hole 31a is the same as the inner diameter dimension of the through hole of a rectangular plate-shaped cutting insert (rhombic insert) conforming to ISO standards.
- the inner diameter of the contacted portion 31c is larger than the inner diameter of the retaining portion 31d by, for example, less than several millimeters (about 0.6 mm in diameter in this embodiment).
- the inner diameter dimension of the contacted portion 31c of the through hole 31a may be the same as the inner diameter dimension of the through hole of the cutting insert conforming to the ISO standard.
- the through-hole 31a has a vertically inverted symmetrical shape. Therefore, in this embodiment, a pair of retaining portions 31d are provided on the lower side and the upper side of the contacted portion 31c.
- the clamp member 6 of this embodiment has a lever lock mechanism.
- the clamp member 6 has a clamp lever 61 and a fastening screw 62 .
- a clamp lever 61 and a fastening screw 62 are arranged at the first end 4 a of the tool body 4 .
- the clamp lever 61 is a member that bends in an L shape.
- the clamp lever 61 has a first extending portion 61a, a second extending portion 61b, and a projecting portion 61c.
- the first extending portion 61 a is arranged in the lever accommodating portion 47 .
- the first extending portion 61a extends radially. Specifically, the first extending portion 61a extends substantially in the tool axial direction. A rear end portion of the first extending portion 61 a protrudes into the female screw hole 46 .
- the second extending portion 61b extends substantially vertically.
- the lower end of the second extending portion 61b is connected to the tip of the first extending portion 61a.
- the second extending portion 61 b is arranged over the tip portion of the lever accommodating portion 47 , the sheet hole 51 a of the sheet member 51 , and the through hole 31 a of the supporter 3 . That is, the second extending portion 61b is inserted into the through hole 31a from below.
- the projecting portion 61c is arranged at the upper end portion of the second extending portion 61b.
- the protruding portion 61c protrudes at least rearward from the outer peripheral surface of the second extending portion 61b.
- the projecting portion 61c contacts the contacted portion 31c of the through hole 31a.
- the fastening screw 62 extends substantially vertically.
- the fastening screw 62 has a male threaded portion that is screwed into the female threaded portion of the female threaded hole 46 . That is, the fastening screw 62 is screwed into the female screw hole 46 .
- the fastening screw 62 has an upper tapered surface 62a and a lower tapered surface 62b.
- the upper tapered surface 62a is a tapered surface whose diameter increases upward and faces downward.
- the upper tapered surface 62a is arranged above the rear end portion of the first extending portion 61a.
- the fastening screw 62 is screwed into the female screw hole 46 and moved downward from the state where the upper tapered surface 62a is separated upward from the rear end of the first extending portion 61a.
- the upper tapered surface 62a comes into contact with the rear end portion of the first extending portion 61a from above.
- the upper tapered surface 62a presses the rear end portion of the first extending portion 61a downward.
- the clamp lever 61 is rotated by the principle of leverage, and the projecting portion 61c presses the contacted portion 31c backward.
- the supporter 3 By pressing the clamp lever 61, the supporter 3 is pulled backward, and as shown in FIG. is elastically deformed. As a result, the pressing surface 32 a of the gripping arm 32 presses the left one pressing surface 23 d of the pair of pressing surfaces 23 d of the cutting insert 2 . Further, the support surface 35 a of the fixed arm 35 supports the other pressed surface 23 d on the right side of the pair of pressed surfaces 23 d of the cutting insert 2 . Thereby, the cutting insert 2 is sandwiched between the gripping arm 32 and the fixed arm 35 and fixed in the pocket 33 .
- the lower tapered surface 62b is a tapered surface whose diameter increases downward and faces upward.
- the lower tapered surface 62b is arranged below the rear end portion of the first extending portion 61a.
- the fastening screw 62 is loosened from the female screw hole 46, and the fastening screw 62 is pushed upward. move.
- the lower tapered surface 62b comes into contact with the rear end portion of the first extending portion 61a from below.
- the lower tapered surface 62b presses the rear end portion of the first extending portion 61a upward.
- the clamp lever 61 is rotated by the principle of leverage, and the pressure of the projecting portion 61c against the contacted portion 31c is released.
- the pocket 33 has a portion in which the width dimension in the left-right direction becomes smaller toward the front. Specifically, the horizontal distance between the front pressing surface portion 32aa of the pressing surface 32a of the gripping arm 32 and the front supporting surface portion 35aa of the supporting surface 35a of the fixed arm 35 decreases toward the front. In this case, forward withdrawal of the cutting insert 2 held in the pocket 33 is suppressed. The clamping state of the cutting insert 2 by the supporter 3 becomes more stable.
- the contacted portion 31c is arranged at least at the rear end portion of the inner peripheral surface of the through hole 31a
- the retaining portion 31d is arranged at least at the rear end portion of the inner peripheral surface of the through hole 31a.
- the through hole 31a has a vertically inverted symmetrical shape.
- the clamping structure 20 of the cutting insert of the present embodiment can be applied to, for example, a cutting tool with opposite sides. That is, the same supporter 3 can be used as a common product for both right-handed and left-handed cutting tools. Therefore, the versatility of the supporter 3 is enhanced, and member management is easy.
- the contacted portion 31c is arranged on the inner peripheral surface of the through hole 31a so as to extend in the circumferential direction over substantially the entire circumference.
- a retaining portion 31d is arranged on the inner peripheral surface of the through hole 31a over substantially the entire circumference, extending in the circumferential direction.
- the inner diameter dimension of the retaining portion 31d of the through hole 31a of the supporter 3 is the same as the inner diameter dimension of the through hole of the square plate-shaped cutting insert (rhombus insert) conforming to the ISO standard.
- the inner diameter dimension of the contacted portion 31c of the through hole 31a is the same as the inner diameter dimension of the through hole of the cutting insert conforming to the ISO standard.
- the cutting insert clamping structure 20 of the present embodiment is applied to an existing indexable cutting tool in which a square plate-shaped cutting insert conforming to general ISO standards is attached to an insert mounting seat. It is possible. That is, the product of the present invention can be mounted on the insert mounting seat of the tool body of the conventional product, and versatility is enhanced.
- FIG. 24 is a partial cross-sectional view showing a fourth modification of the cutting insert clamping structure 20 of the second embodiment described above.
- the through hole 31a of the supporter 3 is not symmetrically inverted.
- One retaining portion 31d of the through hole 31a is provided only below the contacted portion 31c. Also in this case, the same effects as those of the above-described second embodiment can be obtained.
- FIG. 25 is a partial cross-sectional view showing a fifth modification of the cutting insert clamping structure 20 of the second embodiment.
- the through-hole 31a of the supporter 3 is not symmetrically inverted.
- the inner peripheral surface of the through-hole 31a has a tapered surface whose diameter decreases downward.
- the retaining portion 31d is arranged below the contacted portion 31c on the inner peripheral surface of the through hole 31a, and protrudes further into the through hole 31a (that is, radially inward) than the contacted portion 31c. Also in this case, the same effects as those of the above-described second embodiment can be obtained.
- FIG. 26 is a partial cross-sectional view showing a sixth modification of the cutting insert clamp structure 20 of the second embodiment.
- the through hole 31a has a dimple-shaped concave portion on its inner peripheral surface.
- the concave portion is arranged at least at the rear end portion of the inner peripheral surface of the through hole 31a.
- a plurality of recesses may be provided on the inner peripheral surface of the through hole 31a at intervals in the circumferential direction.
- the contacted portion 31c is arranged in at least a part of the recess (such as the deepest portion).
- the retaining portion 31d is arranged below the contacted portion 31c and protrudes radially inward from the contacted portion 31c. Also in this case, the same effects as those of the above-described second embodiment can be obtained.
- the angle formed between the side surfaces 3d, the angle formed between the pair of body-side flat portions 3f of the supporter 3, and the angle formed between the pair of side walls 5b of the insert mounting seat 5 are each 80°.
- each of the above angles may be, for example, 90°, 60°, 55°, or the like. Even in this case, the present invention can be applied to existing indexable cutting tools equipped with various rhombic inserts complying with ISO standards, as in the above-described embodiments.
- the present invention may combine the configurations described in the above-described embodiments and modifications without departing from the gist of the present invention, and addition, omission, replacement, and other modifications of the configuration are possible. . Moreover, the present invention is not limited by the above-described embodiments and the like, but is limited only by the scope of the claims.
- the cutting insert can be stably held while the cutting insert is made compact and the cost is reduced. Therefore, it has industrial applicability.
Abstract
Description
本願は、2021年2月25日に日本に出願された特願2021-028916号および2022年2月18日に日本に出願された特願2022-024232号について優先権を主張し、その内容をここに援用する。
また、本発明の刃先交換式切削工具の一つの態様は、上述の切削インサートのクランプ構造と、前記インサート取付座を有する前記工具本体と、前記インサート取付座に前記切削インサートのクランプ構造を固定する前記クランプ部材と、を備える。
上記切削インサートのクランプ構造において、前記切削インサートの後方端部は、前記サポーターの前記中心軸よりも前方に位置することが好ましい。
また、切削インサートをサポーターから取り外す際には、切削インサートとポケットとの間の引っ掛かり等により、サポーターを前方上側へ引っ張る力が作用する場合がある。このような場合でも、本発明の上記構成によれば、クランプ部材の一部に対して、後方下側から抜止め部が安定して接触するため、上述の作用効果がより格別なものとなる。
本発明の第1実施形態の切削インサートのクランプ構造10、およびこれを備える刃先交換式切削工具1について、図1~図7を参照して説明する。本実施形態の刃先交換式切削工具1は、旋削加工(ターニング)に用いられる刃先交換式バイトであり、図示しない旋盤などの工作機械の刃物台等に着脱可能に装着される。なお本実施形態では、刃先交換式切削工具1を、単に切削工具または工具などと呼ぶ場合がある。
切削インサートのクランプ構造10は、クランプ部材6により工具本体4のインサート取付座5に着脱可能に取り付けられる。切削インサートのクランプ構造10は、多角形柱状をなす切削インサート2と、切削インサート2を保持する板状のサポーター3と、を備える。
本実施形態では、サポーター3の一対の板面3a,3bが向く方向を、板厚方向または上下方向と呼ぶ。各図に示すXYZ直交座標系において、板厚方向は、Z軸方向に相当する。板厚方向のうち、裏面3bから表面3aへ向かう方向(+Z側)を上側と呼び、表面3aから裏面3bへ向かう方向(-Z側)を下側と呼ぶ。なお板厚方向は、サポーター3の中心軸C1の軸方向に相当する。このため板厚方向は、軸方向と言い換えてもよい。
板厚方向と直交する方向のうち、サポーター3のポケット33が配置される一の角部と、一の角部の対角に位置する他の角部とを通る所定方向を、前後方向と呼ぶ。前後方向は、X軸方向に相当する。前後方向のうち、他の角部から一の角部(ポケット33)へ向かう方向(-X側)を前方と呼び、一の角部から他の角部へ向かう方向(+X側)を後方と呼ぶ。
板厚方向および前後方向と直交する方向を、側方または左右方向と呼ぶ。側方は、Y軸方向に相当する。側方のうち一方側(+Y側)を左側と呼び、他方側(-Y側)を右側と呼ぶ。+Y側は、切削インサートのクランプ構造10を前方から見たときの左側に相当し、-Y側は、切削インサートのクランプ構造10を前方から見たときの右側に相当する。
また、サポーター3の中心軸C1回りに周回する方向を周方向と呼ぶ。
なお中心軸C1は、サポーター中心軸C1と言い換えてもよく、軸方向は、サポーター軸方向と言い換えてもよい。また径方向は、サポーター径方向と言い換えてもよい。周方向は、サポーター周方向と言い換えてもよい。
インサート中心軸C2と直交する方向をインサート径方向と呼ぶ。インサート径方向のうち、インサート中心軸C2に近づく方向をインサート径方向の内側と呼び、インサート中心軸C2から離れる方向をインサート径方向の外側と呼ぶ。
インサート中心軸C2回りに周回する方向をインサート周方向と呼ぶ。
工具本体4は、例えば鋼材等の金属製である。図1に示すように、工具本体4は、略角柱状であり、図示しない工具中心軸に沿って延びる。インサート取付座5は、工具本体4の両端部(第1端部4aおよび図示しない第2端部)のうち、第1端部4aに配置される。なお本実施形態において、工具中心軸が延びる方向を工具軸方向と呼んでもよい。また、工具軸方向のうち、第2端部から第1端部4aへ向かう方向を先端側と呼び、第1端部4aから第2端部へ向かう方向を後端側と呼んでもよい。工具本体4は、互いに反対方向を向く頂面41および底面42、互いに反対方向を向く一対の横面43,44、ならびに、第1端部4aの端面に位置する先端面45を有する。
インサート取付座5は、板状のシート部材51を有する。シート部材51は、インサート取付座5の一部(底面)を構成する。シート部材51は、シート部材51を板厚方向に貫通するシート孔(図示省略)を有する。シート部材51は、シート孔に挿通される図示しないシート固定ネジにより、第1端部4aに固定される。本実施形態ではシート部材51が、四角形板状である。シート部材51は、例えば超硬合金製等である。
底壁5aは、シート部材51の一対の板面のうち、上側を向く一方の板面(上面)により構成される。側壁5bは、複数設けられる。本実施形態ではインサート取付座5が、一対の側壁5bを有する。本実施形態では、上下方向から見て、一対の側壁5b間に形成される角度が、例えば、80°である。
切削インサート2は、例えば、超硬合金製、PCD(多結晶ダイヤモンド)製、cBN(立方晶窒化ホウ素)製、サーメット製、セラミック製等である。切削インサート2は、工具本体4よりも硬度が高い硬質焼結体である。切削インサート2は、サポーター3のポケット33に着脱可能に取り付けられる。切削インサート2は、サポーター3にクランプされることにより、ポケット33に固定される。
後側壁23bは、外周面23のうち後方を向く部分に配置される。一対の後側壁23bは、インサート周方向に並んで配置される。本実施形態では一対の後側壁23b間に、後方に向けて凸となる凸曲面部が配置される。
横側壁23cは、外周面23のうち側方を向く部分に配置される。一対の横側壁23cは、左右方向(側方)において互いに反対方向を向く。すなわち、一対の横側壁23cのうち一方の横側壁23cは左側を向き、他方の横側壁23cは右側を向く。
被押圧面23dは、平面状である。すなわち本実施形態では、被押圧面23dが、1つの平面部により構成される。被押圧面23dは、外周面23に一対設けられる。本実施形態では一対の被押圧面23dは、一対の横側壁23cに配置される。つまり被押圧面23dは、少なくとも横側壁23cに配置される。すなわち、被押圧面23dは、外周面23のうち少なくとも側方を向く部分に配置される。
サポーター3は、例えば鋼材等の金属製である。サポーター3は、切削インサート2よりも硬度が低く、靭性が高く、廉価な材料により構成される。サポーター3は、切削インサート2の外周面23を、側方および後方から保持する。本実施形態ではサポーター3が、表裏反転対称形状である。
サポーター本体31は、貫通孔31aと、拘束面31bと、を有する。貫通孔31aおよび拘束面31bは、サポーター本体31の前方部分に配置される。
把持アーム32には、アーム側平面部3gおよび前側面3dが配置される。アーム側平面部3gおよび前側面3dは、把持アーム32のうち径方向外側を向く壁部に配置される。
図1に示すように、クランプ部材6は、インサート取付座5に、切削インサートのクランプ構造10のうち少なくともサポーター3を固定する。クランプ部材6は、クランプ駒6aと、クランプネジ6bと、を有する。
スライド面6dは、クランプ駒6aの後方端部に配置され、下側を向く。スライド面6dは、後方に向かうに従い下側に位置する傾斜した平面状である。スライド面6dは、工具本体4の傾斜面41aと摺動可能に接触する。
以上説明した本実施形態の切削インサートのクランプ構造10および刃先交換式切削工具1では、サポーター3が切削インサート2を保持することにより、例えば超硬合金などの高価な硬質材料からなる切削インサート2の外形を小さく抑えることができる。このため、工具コストを削減できる。
この場合、1つの切削インサート2に切刃24が少なくとも4つ配置されるため、切削インサート2の工具寿命を延ばすことができる。
この場合、サポーター3によって、切削インサート2の外周面23のうち後側壁23bおよび横側壁23cを保持できる。サポーター3による切削インサート2の保持状態が安定する。
この場合、簡素な構造により、クランプ部材6をサポーター本体31に係止させることができる。
この場合、例えば、一般的なISO規格に準ずる四角形板状の切削インサートがインサート取付座に装着される、既存の刃先交換式切削工具に対して、本実施形態の切削インサートのクランプ構造10を適用可能である。すなわち、従来品の工具本体のインサート取付座に本発明品を搭載することができ、汎用性が高められる。
この場合、把持アーム32が弾性変形したときの押圧面32aの変位量、特に側方への変位量を大きく確保でき、把持アーム32によって切削インサート2を安定して保持できる。
この場合、スリット34の一部に応力集中が生じることが抑えられ、スリット34を起点とするサポーター3の破損等が抑制される。
この場合、一対の把持アーム32がそれぞれ弾性変形することにより、一対の把持アーム32の各押圧面32a同士の相対的な変位量が大きく確保される。このため、ポケット33への切削インサート2の着脱作業が容易である。特に、本実施形態のように切削インサート2が小型化されていると、サポーター3への着脱時に切削インサート2が意図せず落下したり紛失したりすることが考えられるが、上記構成によれば着脱性が高められるため、このような落下や紛失が抑制される。
この場合、サポーター本体31の略円筒状をなす前方部分のうち前端部(周壁の一部)が、ポケット33および貫通孔31aによって左右方向に分断されることになる。一対の拘束面31bが個別に変位可能となるため、各拘束面31bと各被拘束面23eとの密着性をより高めることができる。
なお、本発明は前述の第1実施形態に限定されず、例えば下記に説明するように、本発明の趣旨を逸脱しない範囲において構成の変更等が可能である。なお、変形例の図示においては、前述の実施形態と同じ構成要素には同一の符号を付し、下記では主に異なる点について説明する。
また切削インサート2が、表裏反転対称形状の両面タイプである一例を挙げたが、これに限らない。切削インサート2は、表裏反転対称形状ではない片面タイプであってもよい。
この第1変形例によれば、切削インサートのクランプ構造60の構造を簡素化しつつ、前述の第1実施形態と同様の作用効果が得られる。
この第3変形例によれば、切削インサート2のクランプ力をより高めることができる。
次に、本発明の第2実施形態の切削インサートのクランプ構造20、およびこれを備える刃先交換式切削工具11について、図13~図23を参照して説明する。なお本実施形態では、前述の第1実施形態および第1~第3変形例と同じ構成については、同じ名称や符号を付すなどしてその説明を省略する場合がある。また方向の定義についても、特に説明しない限り、前述の実施形態等と同様である。
本実施形態では、左側(+Y側)を向く他方の横面44のうち工具本体4の第1端部4aに位置する部分が、第1端部4a以外の部分よりも、左側に突出する。
インサート取付座5は、工具本体4の第1端部4aつまり先端部において、頂面41、他方の横面44および先端面45に開口する。インサート取付座5は、工具本体4の頂面41、他方の横面44および先端面45から窪む凹状である。
レバー収容部47の後端側の端部は、雌ネジ孔46と接続される。レバー収容部47の後端部は、雌ネジ孔46と連通する。
図19および図20A~図20Cに示すように、本実施形態の切削インサート2は、インサート中心軸C2を中心とするトリゴン型の六角柱状(六角形板状)である。図20Aに示す平面視で、切削インサート2は、その外周部に、インサート中心軸C2回りに交互に並ぶ鋭角の角部と鈍角の角部とを、各3つ有する。すなわち、切削インサート2は、その外周部に角部を計6つ有する。
図18および図21~図23に示すように、サポーター3は、サポーター本体31と、把持アーム32と、ポケット33と、スリット34と、固定アーム35と、を有する。
図16に示すように、本実施形態のクランプ部材6は、レバーロック機構を有する。クランプ部材6は、クランプレバー61と、締結ネジ62と、を有する。クランプレバー61および締結ネジ62は、工具本体4の第1端部4aに配置される。
以上説明した本実施形態の切削インサートのクランプ構造20および刃先交換式切削工具11によれば、前述の実施形態および変形例と同様の作用効果が得られる。
この場合、ポケット33に保持された切削インサート2の前方への抜け出しが抑制される。サポーター3による切削インサート2のクランプ状態がより安定する。
この場合、クランプ部材6の一部(突起部61c)が、貫通孔31aの被接触部31cを後方へ向けて押圧するので、後方へ向けた押圧力によって、サポーター3および切削インサート2をインサート取付座5に安定して固定することができる。
また、切削インサート2をサポーター3から取り外す際には、切削インサート2とポケット33との間の引っ掛かり等により、サポーター3を前方上側へ引っ張る力が作用する場合がある。このような場合でも、本実施形態の上記構成によれば、クランプ部材6の一部に対して、後方下側から抜止め部31dが安定して接触するため、上述の作用効果がより格別なものとなる。
この場合、サポーター3を上下反転させた姿勢でインサート取付座5に配置した場合においても、上述と同様の抜止め機能が得られる。したがって、本実施形態の切削インサートのクランプ構造20を、例えば勝手違いの切削工具に対しても適用可能である。すなわち、切削工具が右勝手の場合および左勝手の場合のいずれにおいても、同一のサポーター3を共通品として使用できる。このため、サポーター3の汎用性が高められ、かつ部材管理が容易である。
この場合、サポーター3の製作時において、貫通孔31aに被接触部31cおよび抜止め部31dを加工しやすい。サポーター3の製造が容易である。
この場合、例えば、一般的なISO規格に準ずる四角形板状の切削インサートがインサート取付座に装着される、既存の刃先交換式切削工具に対して、本実施形態の切削インサートのクランプ構造20を適用可能である。すなわち、従来品の工具本体のインサート取付座に本発明品を搭載することができ、汎用性が高められる。
なお、本発明は前述の第1、第2実施形態に限定されず、例えば下記に説明するように、本発明の趣旨を逸脱しない範囲において構成の変更等が可能である。なお、以下に説明する変形例の図示においては、前述の実施形態および変形例と同じ構成要素には同一の符号を付し、下記では主に異なる点について説明する。
この場合も、前述の第2実施形態と同様の作用効果が得られる。
この場合も、前述の第2実施形態と同様の作用効果が得られる。
この場合も、前述の第2実施形態と同様の作用効果が得られる。
2…切削インサート
3…サポーター
4…工具本体
5…インサート取付座
6…クランプ部材
10,20,60,70,80…切削インサートのクランプ構造
23…外周面
23a…前側壁
23b…後側壁
23c…横側壁
23d…被押圧面
23e…被拘束面
24…切刃
31…サポーター本体
31a…貫通孔
31b…拘束面
31c…被接触部
31d…抜止め部
32…把持アーム
32a…押圧面
33…ポケット
34…スリット
34a…ポケット開口部
C1…サポーターの中心軸
Claims (13)
- クランプ部材により工具本体のインサート取付座に着脱可能に取り付けられる切削インサートのクランプ構造であって、
多角形柱状をなし、少なくとも前方端部に切刃が配置される切削インサートと、
前記切削インサートの外周面を、側方および後方から保持する板状のサポーターと、を備え、
前記切削インサートは、
前記外周面のうち少なくとも側方を向く部分に配置される被押圧面と、
前記外周面のうち前記被押圧面よりも後方に位置する部分に配置される被拘束面と、を有し、
前記サポーターは、
前記クランプ部材が係止されるサポーター本体と、
前記サポーター本体から前記サポーターの板厚方向と直交する方向に突出し、前記サポーター本体に対して弾性変形可能な把持アームと、
前記サポーターの前方端部から後方に窪む凹状であり、前記切削インサートが配置されるポケットと、
前記サポーター本体と前記把持アームとの間に配置され、前記板厚方向において前記サポーターの両側に開口するスリットと、を有し、
前記サポーター本体は、前記被拘束面と接触する拘束面を有し、
前記把持アームは、前記被押圧面と接触する押圧面を有し、
前記スリットは、前記ポケットに開口するポケット開口部を有し、
前記ポケット開口部は、前記拘束面と前記押圧面との間に配置される、
切削インサートのクランプ構造。 - 前記切削インサートは、前記板厚方向において表裏反転対称形状であり、かつ前後方向において前後反転対称形状である、
請求項1に記載の切削インサートのクランプ構造。 - 前記切削インサートは、六角柱状であり、
前記外周面は、
前方を向く一対の前側壁と、
後方を向く一対の後側壁と、
前記前側壁と前記後側壁との間に位置し、側方を向く一対の横側壁と、を有し、
前記被拘束面は、前記後側壁に配置され、
前記被押圧面は、少なくとも前記横側壁に配置される、
請求項1または2に記載の切削インサートのクランプ構造。 - 前記サポーター本体は、前記サポーターの中心軸上に位置して前記サポーター本体を前記板厚方向に貫通する貫通孔を有し、
前記貫通孔に、前記クランプ部材の一部が挿入されて係止される、
請求項1から3のいずれか1項に記載の切削インサートのクランプ構造。 - 前記サポーターは、四角形板状であり、
前記貫通孔の中心軸は、前記サポーターの中心軸と同軸に配置される、
請求項4に記載の切削インサートのクランプ構造。 - 前記切削インサートの後方端部は、前記サポーターの前記中心軸よりも前方に位置する、
請求項4または5に記載の切削インサートのクランプ構造。 - 前記切削インサートは、前記ポケットから上側に抜き出し可能とされ、
前記貫通孔には、前記クランプ部材の一部が下側から挿入され、
前記貫通孔は、
前記貫通孔の内周面に配置され、前記クランプ部材の一部が接触する被接触部と、
前記貫通孔の内周面のうち前記被接触部よりも下側に配置され、前記被接触部よりも前記貫通孔の内部に突出する抜止め部と、を有する、
請求項4から6のいずれか1項に記載の切削インサートのクランプ構造。 - 前記被接触部は、前記貫通孔の内周面のうち少なくとも後端部に配置され、
前記抜止め部は、前記貫通孔の内周面のうち少なくとも後端部に配置される、
請求項7に記載の切削インサートのクランプ構造。 - 前記貫通孔は、上下反転対称形状である、
請求項7または8に記載の切削インサートのクランプ構造。 - 前記スリットは、前記板厚方向から見て前記サポーターの中心軸回りに延びる、
請求項1から9のいずれか1項に記載の切削インサートのクランプ構造。 - 前記スリットは、前記板厚方向から見て円弧状である、
請求項10に記載の切削インサートのクランプ構造。 - 前記把持アームは、一対設けられ、
前記ポケットは、一対の前記把持アーム間に配置される、
請求項1から11のいずれか1項に記載の切削インサートのクランプ構造。 - 請求項1から12のいずれか1項に記載の切削インサートのクランプ構造と、
前記インサート取付座を有する前記工具本体と、
前記インサート取付座に前記切削インサートのクランプ構造を固定する前記クランプ部材と、を備える、
刃先交換式切削工具。
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EP22759807.5A EP4299219A1 (en) | 2021-02-25 | 2022-02-25 | Clamp structure of cutting insert, and cutting-edge replaceable cutting tool |
KR1020237028713A KR20230145576A (ko) | 2021-02-25 | 2022-02-25 | 절삭 인서트의 클램프 구조 및 날끝 교환식 절삭 공구 |
CN202280016992.XA CN116917071A (zh) | 2021-02-25 | 2022-02-25 | 切削刀片的夹紧结构及可转位刀片式切削工具 |
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JP2021028916A (ja) | 2019-12-02 | 2021-02-25 | テンパール工業株式会社 | プラグ |
JP2022024232A (ja) | 2020-07-09 | 2022-02-09 | 株式会社リブドゥコーポレーション | 止着テープ、止着テープを備えた使い捨ておむつ、および止着テープの製造方法 |
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2022
- 2022-02-25 EP EP22759807.5A patent/EP4299219A1/en active Pending
- 2022-02-25 KR KR1020237028713A patent/KR20230145576A/ko unknown
- 2022-02-25 WO PCT/JP2022/007935 patent/WO2022181773A1/ja active Application Filing
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JPH07237013A (ja) * | 1994-02-28 | 1995-09-12 | Mitsubishi Materials Corp | スローアウェイチップおよび切削工具 |
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