CUTTING UNIT, CUTTING TOOL, CUTTING TOOL SUPPORT AND METHOD FOR PRODUCING CUT ARTICLES

Abstract

Stable holding of a holder by means of a holding block while at the same time ensuring feasibility of an operation for attaching the holder to the holding block. A clamping member has a pressing portion that, in a state of being interposed between an inner side surface of a groove of a holding block and an upper surface of a holder, presses the holder toward the other inner side surface of the groove. The pressing portion has a first projection that comes into contact with a first inclined surface of a first recess of the holder, and a second projection that is separate from the first projection and comes into contact with a second inclined surface of a second recess of the holder.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a cutting tool, a cutting tool and a cutting tool rest used for cutting a workpiece, and a method for producing a cut article. BACKGROUND OF THE INVENTION

[0002] A cutting unit attachable to a machine tool is used in the case of cutting a workpiece made of metal or the like. A cutting unit described in Patent Document 1 includes a holder (a portion obtained by removing a tip from a cutting tool in Patent Document 1) and a cutting edge arranged at the front end of the holder and on one side of a first side surface. The cutting unit described in Patent Document 1 includes a holding block (referred to as a cutting tool holder in Patent Document 1) having a groove (referred to as a recessed groove in Patent Document 1) that holds the holder, and a clamping member that fixes the holder to the holding block.

[0003] The clamping member includes two fastening screws screwed into the retaining block and pressing pieces coupled to front end portions of the two fastening screws, respectively. In a state of being interposed between one inner side surface of the groove of the retaining block and the top surface of the retainer, the two pressing pieces press the retainer toward the other inner side surface of the groove of the retaining block. A first pressing piece of the two pressing pieces comes into contact with an inclined surface of a first recess of two recesses (referred to as a recess in Patent Document 1) of the retainer. A second pressing piece of the two pressing pieces comes into contact with an inclined surface of a second recess of the two recesses of the retainer. CITATION LISTPATENT LITERATURE

[0004] Patent Document 1: JP 02-048164 UM-B SHORT DESCRIPTION

[0005] A cutting unit according to the present disclosure includes a holder, a cutting edge, a holding block, and a clamping member. A holder has a quadrangular prism shape extending from a front end toward a rear end, and includes a front end surface located on one side of the front end, an upper surface extending from the front end surface toward the rear end, a lower surface located on a side opposite to the upper surface, a first side surface located between the upper surface and the lower surface and extending from the front end surface toward the rear end, and a second side surface located on a side opposite to the first side surface. A cutting edge is located at the front end and at one side of the first side surface.A holding block has a groove configured to hold the holder. A clamping member is arranged on the holding block. The clamping member has a pressing portion and is configured to fix the holder to the holding block. The pressing portion is configured, in a state of being interposed between an inner side surface of the groove and a body portion, to press the holder toward one side of another inner side surface of the groove. The upper surface has a first recess having a first inclined surface that is increasingly separated from the lower surface as it approaches one side of the rear end, and a second recess arranged closer to the rear end than the first recess and having a second inclined surface that is increasingly separated from the lower surface as it approaches the rear end side.The pressing portion has a first protrusion configured to come into contact with the first inclined surface and a second protrusion separated from the first protrusion and configured to come into contact with the second inclined surface.

[0006] A cutting tool according to the present disclosure includes a holder and a cutting edge. A holder has a quadrangular prism shape extending from a front end toward a rear end, and includes a front end surface located on one side of the front end, an upper surface extending from the front end surface toward the rear end, a lower surface located on a side opposite to the upper surface, a first side surface located between the upper surface and the lower surface and extending from the front end surface toward the rear end, and a second side surface located on a side opposite to the first side surface. A cutting edge is located on the front end and on one side of the first side surface.The upper surface has a first recess and a second recess located closer to the rear end than the first recess. The first recess has a first inclined surface that is increasingly separated from the lower surface as it approaches a side of the rear end, and is open at the first side surface and the second side surface. The second recess has a second inclined surface that is increasingly separated from the lower surface as it approaches the side of the rear end, and is open at the first side surface and the second side surface.

[0007] A cutting tool rest according to the present disclosure, to which a cutting tool according to the present disclosure is attachable, includes a holding block and a clamping member. A holding block has a groove configured to hold the holder. The clamping member is disposed on the holding block. The clamping member has a pressing portion and is configured to fix the holder to the holding block. The pressing portion is configured, in a state of being interposed between an inner side surface of the groove and the upper surface, to press the holder toward a side of another inner side surface of the groove. The pressing portion includes a first protrusion configured to come into contact with the first inclined surface and a second protrusion separated from the first protrusion and configured to come into contact with the second inclined surface. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic perspective view of a cutting unit according to an embodiment of the present disclosure. Fig. 2 is a schematic enlarged side view of the Fig. Cutting unit shown in Figure 1. Fig. 3 is a schematic plan view of the Fig. Cutting unit shown in Figure 1. Fig. 4 is a schematic perspective view of a cutting tool according to the embodiment of the present disclosure. Fig. 5 is a schematic plan view of a part of the Fig. 4 shown cutting tool. Fig. 6 is a schematic side view of the Fig. 4 shown cutting tool. Fig. 7 is a schematic bottom view of the Fig. 4 shown cutting tool. Fig. 8 is a schematic enlarged view of the Fig. 4 shown cutting tool, seen from the front of the cutting tool. Fig. 9 is a schematic enlarged cross-sectional view taken along a line IX-IX in Fig. 2. Fig. 10 is a schematic enlarged view taken along a line XX in Fig. 6. Fig. 11 is a schematic enlarged view taken along a line XI-XI in Fig. 6. Fig. 12 is a schematic perspective view showing a clamping member and a plurality of fastening screws. Fig. 13 is a schematic perspective view showing the clamping member and the plurality of fastening screws. Fig. 14 is a schematic cross-sectional view along the longitudinal direction of the clamping element. Fig. 15 is a schematic cross-sectional view taken along a line XV-XV in Fig. 3. Fig. 16 is a schematic view describing a method of manufacturing a cut article according to the present disclosure. Fig. 17 is a schematic view showing the method of manufacturing the tailored article according to the present disclosure. Fig. 18 is a schematic view showing the method of manufacturing the cut article according to the present disclosure. DESCRIPTION OF EMBODIMENTS

[0008] The two pressing pieces in the cutting unit described in Patent Document 1 are provided independently of each other, and the pressing force of the first pressing piece with respect to the first recess of the holder and the pressing force of the second pressing piece with respect to the second recess of the holder are individually adjusted. Therefore, a difference between the pressing force of the first pressing piece and the pressing force of the second pressing piece may become large. Then, a stress is concentrated on one of the pressing pieces and one of the fixing screws, and there is a risk of deteriorating the durability of the cutting unit. There is a risk that one of the pressing pieces serves as a fulcrum and causes positional displacement of the holder.To address these concerns, the fastening forces of the two fastening screws must be adjusted with high precision to reduce the difference between the pressing force of the first pressing piece and the pressing force of the second pressing piece. As a result, in the cutting unit described in Patent Document 1, a process of attaching the holder to the holding block tends to become complicated.

[0009] Therefore, there has been a need to develop a cutting unit capable of stably holding a holder by means of a holding block while improving the feasibility of an operation for attaching the holder to the holding block.

[0010] According to one aspect of the present disclosure, a holder can be stably held by a holding block while improving the operability of an operation of attaching the holder to the holding block.

[0011] A cutting tool and a method for manufacturing a cut article according to an embodiment of the present disclosure will be described in detail below with reference to the drawings. However, for convenience of description, each of the drawings referred to below is a simplified illustration of only components necessary for describing the embodiment. Therefore, a cutting unit according to the embodiment of the present disclosure may include an optional component that is not shown in each of the referenced drawings. The dimensions of the components in each of the drawings do not represent the actual dimensions of the components, the size ratios of each of the individual elements, or the like.

[0012] In the present disclosure, an orthogonal coordinate system XYZ is assumed, which is defined by three mutually orthogonal directions. An X direction is a front-back direction, one side in the X direction is a front side or a front direction, and the other side in the X direction is a back side or a back direction. A Y direction is a left-right direction, one side in the Y direction is a left side or a leftward direction, and the other side in the Y direction is a right side or a rightward direction. A Z direction is a vertical direction, one side in the Z direction is a top side or an upward direction, and the other side in the Z direction is a bottom side or a downward direction. In the present disclosure, "orthogonal" is not limited to being strictly orthogonal, but means that an error of about ± 5 degrees is allowable.“Parallel” is not limited to being strictly parallel, but means that an error of about ± 5 degrees is allowed.

[0013] In the drawings, “FF” means the front direction, “FR” means the back direction, “L” means the left direction, “R” means the right direction, “U” means the up direction and “D” means the down direction. Cutting unit 10

[0014] A cutting unit 10 according to the embodiment of the present disclosure will be described with reference to Fig. 1 to 14 described. Fig. 1 is a schematic perspective view of the cutting unit according to the embodiment of the present disclosure. Fig. 2 is a schematic enlarged side view of the Fig. Cutting unit shown in Figure 1. Fig. 3 is a schematic plan view of the Fig. Cutting unit shown in Figure 1. Fig. 4 is a schematic perspective view of the cutting tool according to the embodiment of the present disclosure. Fig. 5 is a schematic plan view of the Fig. 4 shown cutting tool. Fig. 6 is a schematic side view of the Fig. 4 shown cutting tool. Fig. 7 is a schematic bottom view of the Fig. 4 shown cutting tool. Fig. 8 is a schematic enlarged view of the Fig. 4 shown cutting tool, seen from the front of the cutting tool. Fig. 9 is a schematic enlarged cross-sectional view taken along a line IX-IX in Fig. 2. Fig. 10 is a schematic enlarged view taken along a line XX in Fig. 6. Fig. 11 is a schematic enlarged view taken along a line XI-XI in Fig. 6. Fig. 12 and Fig. 13 are schematic perspective views showing a clamping member 48 and a plurality of fastening screws 50, viewed from different directions. XIVA of Fig. 14 is a schematic cross-sectional view taken along a line XIVA-XIVA in Fig. 12. XIVB of Fig. 14 is a schematic cross-sectional view taken along a line XIVB-XIVB in Fig. 12.

[0015] Fig. 15 is a schematic cross-sectional view taken along a line XV-XV in Fig. 3.

[0016] As in the Fig. 1 to 3, the cutting unit 10 according to the embodiment of the present disclosure is a unit used for cutting a workpiece W (see Fig. 16). Cutting the workpiece W includes external turning, grooving, parting off, and the like. The cutting unit 10 may include the cutting tool 12 for cutting the workpiece W and a cutting tool support 14 to which the cutting tool 12 is attachable.

[0017] As in the Fig. 4 to 7, the cutting tool 12 may include a holder 16 mounted on the cutting tool rest 14, a cutting insert 18 held by the holder 16, and a clamping screw 20 that fixes the cutting insert 18 to the holder 16. The holder 16 may have a quadrangular prism shape extending along the X direction from a front end 16a toward a rear end 16b. The longitudinal direction of the holder 16 may be the X direction.

[0018] In the present disclosure, "the holder 16 having the quadrangular prism shape" means not only that the holder 16 has a strict quadrangular prism shape, but also that the holder 16 has a quadrangular prism-shaped body portion 16m, so that the holder 16 can be visually recognized as having a substantially overall quadrangular prism shape. One end of the body portion 16m of the holder 16 may be located closer to the rear end 16a than the front end 16b of the holder 16. The other end of the body portion 16m of the holder 16 may coincide with the rear end 16b of the holder 16. The body portion 16m held by the cutting tool rest is also referred to as a shank.

[0019] As in the Fig. 4 to 8, the holder 16 has a front end surface 22 located on one side of the front end 16a and a rear end surface 24 located on a side opposite the front end surface 22. The front end surface 22 of the holder 16 is not limited to one flat surface, but may include a plurality of flat surfaces and / or curved surfaces. The holder 16 may have an upper surface 26 extending in the X direction from the front end surface 22 toward the rear end 16b to the rear end surface 24. The holder 16 may have a lower surface 28 located on a side opposite the upper surface 26, and the lower surface 28 may extend in the X direction from the front end surface 22 toward the rear end 16b to the rear end surface 24.

[0020] As in the Fig. 4 to 6 and Fig. 8, the holder 16 may have a first side surface 30 disposed between the upper surface 26 and the lower surface 28, and the first side surface 30 may extend in the X-direction from the front end surface 22 toward the rear end 16b to the rear end surface 24. The first side surface 30 of the holder 16 may be connected to the upper surface 26 and the lower surface 28. In the body portion 16m of the holder 16, the first side surface 30 may be orthogonal to the lower surface 28 and the upper surface 26. It should be noted that Fig. 6 is a front view of the first side surface 30 described above.

[0021] The holder 16 may have a second side surface 32 disposed on a side opposite the first side surface 30, and the second side surface 32 may extend in the X-direction from the front end surface 22 toward the rear end 16b to the rear end surface 24. The second side surface 32 of the holder 16 may be connected to the upper surface 26 and the lower surface 28. In the body portion 16m of the holder 16, the second side surface 32 may be orthogonal to the lower surface 28 and the upper surface 26. It should be noted that Fig. 2 is a front view of the second side surface 32 described above.

[0022] As in the Fig. 4 to 6 and Fig. 8, the holder 16 may have a pocket 34 for holding the cutting insert 18 on one side of the front end 16a. The pocket 34 of the holder 16 may be open at the front end surface 22, the top surface 26, and the first side surface 30. The holder 16 may have a screw hole 36 (see Fig. 7) located on the side of the front end 16a. The screw hole 36 of the holder 16 may be open at the pocket 34 and the bottom surface 28.

[0023] Examples of the material of the holder 16 include metals such as stainless steel, carbon steel, cast iron, and an aluminum alloy. The length of the holder 16 can be set, for example, from 100 mm to 400 mm.

[0024] As in the Fig. 4 to 6 and Fig. 8, the cutting insert 18 may be disposed on the pocket 34 of the holder 16. The cutting insert 18 may be a replaceable insert, called a disposable insert. The cutting insert 18 may have a square plate shape, or, other than the square plate shape, may have a triangular plate shape or a pentagonal plate shape. The cutting insert 18 may have a first insert surface 38, a second insert surface 40 disposed on a side opposite the first insert surface 38, and a plurality of insert side surfaces 42 disposed between the first insert surface 38 and the second insert surface 40.

[0025] The cutting insert 18 may have a cutting edge 44 at an interface between the first insert surface 38 and the insert side surface 42. The cutting edge 44 may be located at the front end 16a of the holder 16 and on one side of the first side surface 30. The first insert surface 38 may serve as a rake surface for chip removal. A portion of the first insert surface 38 serving as the rake surface may be substantially parallel to the top surface 26 of the holder 16. The insert side surface 42 may serve as a clearance surface.

[0026] The cutting insert 18 may have a through-hole opening toward the first insert surface 38 and the second insert surface 40. The through-hole of the cutting insert 18 may be aligned with the screw hole 36 of the holder 16. The cutting insert 18 is attached to the pocket 34 of the holder 16 by screwing and fastening the clamping screw 20, which is inserted through the through-hole of the cutting insert 18, into the screw hole 36 of the holder 16.

[0027] Examples of the material of the cutting insert 10 include a cemented carbide alloy and a cermet. The composition of the cemented carbide alloy includes, for example, WC-Co, WC-TiC-Co, and WC-TiC-TaC-Co. WC-Co is produced by adding cobalt (Co) powder to tungsten carbide (WC) and sintering this mixture. WC-TiC-Co is formed by adding titanium carbide (TiC) to WC-Co. WC-TiC-TaC-Co is formed by adding tantalum carbide (TaC) to WC-TiC-Co. Cermet is a sintered composite material in which a metal is combined with a ceramic component. In particular, examples of cermets include compounds in which a titanium compound, such as titanium carbide (TiC) and titanium nitride (TiN), is the main component.

[0028] The surface of the cutting insert 18 can be coated with a coating film using a chemical vapor deposition (CVD) process or a physical vapor deposition (PVD) process. Examples of the coating film material include titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), and aluminum oxide (Al3O2).

[0029] Although the cutting tool 12 described above is formed of the holder 16 and the cutting insert 18, a solid type cutting tool formed of one element may be used.

[0030] As in the Fig. 1 to 3, the cutting tool rest 14 according to the embodiment of the present disclosure may include a holding block 46, a clamping member 48 that secures the holder 16 to the holding block 46, and a plurality of fastening screws 50 for attaching the clamping member 48 to the holding block 46. The holding block 46 is mounted on a machining head of a lathe.

[0031] The holding block 46 may have a plurality of grooves 52 for holding (receiving) the body portion 16m of the holder 16, and the plurality of grooves 52 may be arranged at intervals in the Z direction. The groove 52 of the holding block 46 may extend in the X direction. Both ends of the groove 52 of the holding block 46 in the X direction may be open. The number of grooves 52 of the holding block 46 may be one.

[0032] As in the Fig. 1 to 3 and Fig. 9, the groove 52 of the support block 46 may include a bottom surface 52a and a pair of inner side surfaces 52b and 52c rising from both sides of the bottom surface 52a. An inner side surface (first inner side surface) 52b of the groove 52 of the support block 46 may include a guide surface 52g. The guide surface 52g of the groove 52 of the support block 46 may be inclined with respect to the depth direction (a direction parallel to the Y direction) of each of the grooves 52 so that it approaches a center line 52s of the groove as it approaches the bottom surface 52s.

[0033] The bottom surface 52a of the groove 52 of the retaining block 46 can contact the first side surface 30 of the holder 16. The other inner side surface (second inner side surface) 52c of the groove 52 of the retaining block 46 can contact the lower surface 28 of the holder 16. In other words, the first side surface 30 of the holder 16 can contact the bottom surface 52a of the groove 52 of the retaining block 46. The lower surface 28 of the holder 16 can contact the other inner side surface 52c of the groove 52 of the retaining block 46.

[0034] As in the Fig. 1 to 3, the support block 46 may have, at an edge portion of each of the grooves 52, a plurality of screw holes 54 into which the fastening screws 50 are screwed. Examples of the material of the support block 46 include metals such as stainless steel, carbon steel, and cast iron.

[0035] As in the Fig. 1, Fig. 2 and Fig. In the example shown in Figure 9, the clamping member 48 may be disposed at one edge portion of the groove 52 of the support block 46. The clamping member 48 may be attached to the one edge portion of the groove 52 of the support block 46 by means of the plurality of fastening screws 50. The clamping member 48 may extend in the X direction, and the shape of the clamping member 48 may be an L-shape when viewed from the X direction.

[0036] The clamping member 48 may have an attachment part 56 as an attachment portion that is attachable to the one edge portion of the groove 52 of the holding block 46, and the attachment part 56 may extend in the X-direction. The attachment part 56 may have a plurality of through holes 58 (see Fig. 14) through which the fastening screws 50 are inserted, and the plurality of through holes 58 may be arranged at intervals in the X direction. Each of the through holes 58 of the attachment part 56 may be aligned with each of the screw holes 54 of the support block 46.

[0037] As in the Fig. 2 and Fig. 9, the clamping member 48 may include a pressing piece 60 as a pressing portion that presses the retainer 16 toward one side of the other inner side surface (second inner side surface) 52c of the groove 52 of the retainer block 46. The pressing piece 60 may press the retainer 16 toward the other inner side surface 52b of the groove 52 of the retainer block 46 in a state of being interposed between the one inner side surface (first inner side surface) 52c of the groove 52 of the retainer block 46 and the upper surface 26 of the retainer 16. The pressing piece 60 may extend in the X direction and protrude from an edge portion of the attachment part 56. The protrusion direction of the attachment part 56 may be the Y direction.

[0038] As in the Fig. In the example shown in Fig. 9, the pressing piece 60 may have a sliding surface 60f that slides on the guide surface 52g of the groove 52 of the holding block 46. The sliding surface 60f of the pressing piece 60 may be inclined with respect to the protruding direction of the pressing piece 60 so as to approach the center line 52s of the groove 52 of the holding block 46 toward the protruding direction of the pressing piece 60. Examples of the material of the clamping part 48 include metals such as stainless steel, carbon steel, and cast iron.

[0039] Each of the fastening screws 50 inserted into each of the through holes 58 of the attachment part 56 is screwed and fastened into the screw hole 54 of the holding block 46, thereby realizing a wedge effect by means of the sliding surface 60f of the pressing piece 60 of the clamping member 48 and the guide surface 52g of the groove 52 of the holding block 46. Accordingly, the pressing piece 60 of the clamping member 48 presses the holder 16 toward the other inner surface 52c of the groove 52 of the holding block 46, so that the holder 16 can be attached to the holding block 46.

[0040] As in the Fig. 2, Fig. 6 and Fig. In the example shown in Fig. 7, the lower surface 28 of the holder 16 may include a stepped portion 62 having a protruding curved shape projecting toward the rear end 16b. The stepped portion 62 of the holder 16 may be in contact with an end surface 48e of the holding block 46. The holder 16 may be positioned with respect to the groove 52 of the holding block 46 by bringing the stepped portion 62 of the holder 16 into contact with the end surface 48e of the holding block 46 in a state where the body portion 16m of the holder 16 is held in the groove 52 of the holding block 46.

[0041] As in the Fig. 4 to 6, the upper surface 26 of the holder 16 may include a first recess 64 located to one side of one end of the body portion 16m. The first recess 64 of the holder 16 may include a first inclined surface 64f inclined with respect to a virtual surface VF parallel to the lower surface 28 so that it becomes increasingly separated from the lower surface 28 as it approaches one side of the rear end 16b. The first recess 64 of the holder 16 may be open at the first side surface 30 and the second side surface 32.

[0042] As in the Fig. 4 to 6, the upper surface 26 of the holder 16 may include a second recess 66 located closer to the rear end 16b than the first recess 64. The second recess 66 of the holder 16 may include a second inclined surface 66f inclined with respect to the virtual plane VF parallel to the lower surface 28 so that it is separated from the lower surface 28 as it approaches the rear end 16b side. The second recess 66 of the holder 16 may be open at the first side surface 30 and the second side surface 32.

[0043] As in the Fig. 5, a width B1 of the first recess 64 of the holder 16 in the X direction, which is the longitudinal direction of the holder 16, may be larger on a second side surface 32 side than on the first side surface 30 side. A width B2 of the second recess 66 of the holder 16 in the X direction may be larger on the second side surface 32 side than on the first side surface 30 side.

[0044] As in the Fig. 10 and Fig. 11, a depth D1 of the first recess 64 of the holder 16 may be deeper on the second side surface 32 side than on the first side surface 30 side. A depth D2 of the second recess 66 of the holder 16 may be deeper on the second side surface 32 side than on the first side surface 30 side. In a cross section orthogonal to the longitudinal direction of the holder 16, an inclination angle θ1 of the first inclined surface 64f of the first recess 64 with respect to the virtual plane VF parallel to the lower surface 28 may be greater than an inclination angle θ2 of the second inclined surface 66f of the second recess 66 with respect to the virtual plane VF parallel to the lower surface 28. A maximum value of the depth D1 of the first recess 64 of the holder 16 may be greater than a maximum value of the depth D2 of the second recess 66.

[0045] As in the Fig. 12 to 14, the pressing piece 60 may have a first protrusion 68 that comes into contact with the first inclined surface 64f of the first recess 64 of the holder 16, and the first protrusion 68 may protrude in a direction orthogonal to the longitudinal direction of the clamping member 48. The first protrusion 68 of the pressing piece 60 may be arranged on one side of one end 48a of the clamping member 48. The first protrusion 68 of the pressing piece 60 may have a first contact surface 68f that comes into contact with the first inclined surface 64f of the first recess 64 of the holder 16.

[0046] As in the Fig. In the example shown in FIG. 14, in a cross section along the longitudinal direction of the clamping member 48, the width B1 of the first recesses 64 of the holder 16 may be greater than a width T1 of the first projection 68 of the pressing piece 60. The first inclined surface 64f of the first recess 64 of the holder 16 may be a flat surface, and the first contact surface 68f of the first projection 68 of the pressing piece 60 may be a protruding curved surface. Alternatively, the first inclined surface 64f of the first recess 64 of the holder 16 may be a protruding curved surface, and the first contact surface 68f of the first projection 68 of the pressing piece 60 may be a flat surface.

[0047] The pressing piece 60 may have a second protrusion 70 that contacts the second inclined surface 66f of the second recess 66 of the holder 16, and the second protrusion 70 may protrude in the direction orthogonal to the longitudinal direction of the clamping member 48. The second protrusion 70 of the pressing piece 60 may be separated from the first protrusion 68 toward a side of another end 48b of the clamping member 48. The second protrusion 70 of the pressing piece 60 may have a second contact surface 70f that contacts the second inclined surface 66f of the second recess 66 of the holder 16.

[0048] As in the Fig. In the example shown in FIG. 14, in the cross section along the longitudinal direction of the clamping member 48, the width B2 of the second recess 66 of the holder 16 may be larger than a width T2 of the second projection 77 of the pressing piece 60. The second inclined surface 66f of the second recess 66 of the holder 16 may be a flat surface, and the second contact surface 70f of the second projection 70 of the pressing piece 60 may be a protruding curved surface. Alternatively, the second inclined surface 66f of the second recess 66 of the holder 16 may be a protruding curved surface, and the second contact surface 70f of the second projection 70 of the pressing piece 60 may be a flat surface.

[0049] According to an embodiment of the present disclosure, the pressing piece 60 includes the first protrusion 68 that contacts the first inclined surface 64f of the first recess 64 of the holder 16 and the second protrusion 70 that contacts the second inclined surface 66f of the second recess 66 of the holder 16. Therefore, the pressing force of the first protrusion 68 of the pressing piece 60 with respect to the first recess 64 of the holder 16 and the pressing force of the second protrusion 70 of the pressing piece 60 with respect to the second recess 66 of the holder 16 can be adjusted simultaneously without individually adjusting the pressing forces. This allows the holder 16 to be easily attached to the holding block 46 while reducing a difference between the pressing force of the first protrusion 68 of the pressing piece 60 and the pressing force of the second protrusion 70 of the pressing piece 60.Accordingly, according to the example of the embodiment of the present disclosure, the holder 16 can be stably held by the holding block 46, while improving the operability of an operation of attaching the holder 16 to the holding block 46. In other words, the cutting tool 12 can be stably held by the cutting tool rest 14, while improving the operability of the operation of attaching the cutting tool 12 to the cutting tool rest 14.

[0050] Since the first recess 64 and the second recess 66 of the holder 16 are open on the first side surface 30 and the second side surface 32, respectively, the first protrusion 68 and the second protrusion 70 of the pressing piece 60 can be easily brought into contact with the first inclined surface 64f of the first recess 64 and the second inclined surface 66f of the second recess 66 of the holder 16, respectively. Accordingly, the operability of the process of attaching the holder 16 to the holding block 46 can be further improved.

[0051] If the first side surface 30 of the holder 16, which is close to the cutting edge 44, is in contact with the bottom surface 52a of the groove 52 of the holding block 46, the holding block 46 is more likely to absorb chatter vibration during cutting. Accordingly, the chatter vibration can be reduced and the surface roughness of a machined surface Wf (see Fig. 17 and Fig. 18) of the workpiece W can be improved.

[0052] If the width B1 of the first recess 64 of the holder 16 in the X direction is larger on the second side surface 32 side than on the first side surface 30 side, the first projection 68 of the pressing piece 60 can be easily brought into contact with the first inclined surface 64f of the first recess 64 of the holder 16. Accordingly, the operability of the process of attaching the holder 16 to the support block 46 can be further improved.

[0053] If the width B2 of the second recess 66 of the holder 16 in the X direction is larger on the second side surface 32 side than on the first side surface 30 side, the second protrusion 70 of the pressing piece 60 can be easily brought into contact with the second inclined surface 66f of the second recess 66 of the holder 16. Accordingly, the operability of the process of attaching the holder 16 to the holding block 46 can be further improved.

[0054] If the depth D1 of the first recess 64 of the holder 16 is deeper on the second side surface 32 side than on the first side surface 30 side, the first projection 68 of the pressing piece 60 can be easily brought into contact with the first inclined surface 64f of the first recess 64 of the holder 16. Accordingly, the operability of the process of attaching the holder 16 to the holding block 46 can be further improved.

[0055] If the depth D2 of the second recess 66 of the holder 16 is deeper on the second side surface 32 side than on the first side surface 30 side, the second projection 70 of the pressing piece 60 can be easily brought into contact with the second inclined surface 66f of the second recess 66 of the holder 16. Accordingly, the operability of the process of attaching the holder 16 to the holding block 46 can be further improved.

[0056] In particular, when the inclination angle θ1 of the first inclined surface 64f of the first recess 64 is larger than the inclination angle θ2 of the second inclined surface 66f of the second recess 66 in the cross section orthogonal to the longitudinal direction of the holder 16, the holder 16 can be firmly fixed to the holding block 46 at the first recess 64 close to the cutting edge 44. This can improve the machining accuracy of cutting the workpiece W.

[0057] If the maximum value of the depth D1 of the first recess 64 of the holder 16 is greater than the maximum value of the depth D2 of the second recess 66, the holder 16 can be firmly fixed to the holding block 46 at the first recess 64 close to the cutting edge 44. Accordingly, the machining accuracy of cutting the workpiece W can be improved.

[0058] When the width B1 of the first recess 64 of the holder 16 is larger than the width T1 of the first projection 68 of the pressing piece 60 in the cross section along the longitudinal direction of the clamping member 48, the first projection 68 of the pressing piece 60 can be easily brought into contact with the first inclined surface 64f of the first recess 64 of the holder 16. Accordingly, the operability of the process of attaching the holder 16 to the holding block 46 can be further improved.

[0059] When the width B2 of the second recess 66 of the holder 16 is larger than the width T2 of the second projection 77 of the pressing piece 60 in the cross section along the longitudinal direction of the clamping member 48, the second projection 70 of the pressing piece 60 can be easily brought into contact with the second inclined surface 66f of the second recess 66 of the holder 16. Accordingly, the operability of the process of attaching the holder 16 to the holding block 46 can be further improved.

[0060] Since the first inclined surface 64f of the first recess 64 of the holder 16 is a flat surface and the first contact surface 68f of the first protrusion 68 of the pressing piece 60 is a protruding curved surface, the first contact surface 68f of the first protrusion 68 can be stably brought into surface contact with the first inclined surface 64f of the first recess 64 without machining the first recess 64 and the first protrusion 68 under strict manufacturing conditions. Accordingly, the manufacturing cost of the cutting unit 10 can be reduced.

[0061] Since the first inclined surface 64f of the first recess 64 of the holder 16 is a protruding curved surface and the first contact surface 68f of the first projection 68 of the pressing piece 60 is a flat surface, the first contact surface 68f of the first projection 68 can be stably brought into surface contact with the first inclined surface 64f of the first recess 64 without machining the first recess 64 and the first projection 68 under strict manufacturing conditions. Accordingly, the manufacturing cost of the cutting unit 10 can be reduced.

[0062] Since the inclined surface 64f of the first recess 64 of the holder 16 and the first contact surface 68f of the first projection 68 of the pressing piece 60 are flat surfaces, it is necessary to ensure parallelism between the first contact surface 68f of the first recess 64 and the first inclined surface 64f of the first projection 68 in order to bring the first contact surface 68f and the first inclined surface 64f into surface contact with each other. Therefore, in the above-described case, it is necessary to machine the first recess 64 and the first projection 68 under strict manufacturing conditions.

[0063] Since the second inclined surface 66f of the second recess 66 of the holder 16 is a flat surface and the second contact surface 70f of the second protrusion 70 of the pressing piece 60 is a protruding curved surface, the second contact surface 70f of the second protrusion 70 can be stably brought into surface contact with the second inclined surface 66f of the second recess 66 without machining the second recess 66 and the second protrusion 70 under strict manufacturing conditions. Accordingly, the manufacturing cost of the cutting unit 10 can be reduced.

[0064] Since the second inclined surface 66f of the second recess 66 of the holder 16 is a protruding curved surface and the second contact surface 70f of the second projection 70 of the pressing piece 60 is a flat surface, the second contact surface 70f of the second projection 70 can be stably brought into surface contact with the second inclined surface 66f of the second recess 66 without machining the second recess 66 and the second projection 70 under strict manufacturing conditions. Accordingly, the manufacturing cost of the cutting unit 10 can be reduced.

[0065] Since the second inclined surface 66f of the second recess 66 of the holder 16 and the second contact surface 70f of the second projection 70 of the pressing piece 60 are flat surfaces, it is necessary to ensure parallelism between the second inclined surface 66f of the second recess 66 and the second contact surface 70f of the second projection 70 in order to bring the second inclined surface 66f and the second contact surface 70f into surface contact with each other. Therefore, in the above-described case, it is necessary to machine the second recess 66 and the second projection 70 under strict manufacturing conditions. Method for producing a cut article

[0066] A description of a method for manufacturing a cut article according to the present disclosure will be given with reference to the Fig. 16 to 18 given. Fig. 16 to 18 are schematic views showing the method of manufacturing the cut article according to the embodiment of the present disclosure.

[0067] As in the Fig. 16 to 18, the method for manufacturing the cut article according to the embodiment of the present disclosure is a method for manufacturing a cut article M that is the machined workpiece W, and includes a first step, a second step, and a third step. The first step is a step of rotating the workpiece W about its axial center S. The second step is a step of bringing the cutting edge 44 of the cutting insert 18 of the cutting unit 10 into contact with the rotating workpiece W and cutting the workpiece W. The third step is a step of separating the cutting edge 44 of the cutting insert 18 from the cut workpiece W. Examples of the material of the workpiece W include stainless steel, carbon steel, alloy steel, cast iron, and a non-ferrous metal. The specific content of the method for manufacturing the cut article according to the embodiment is as follows.

[0068] First, the cutting unit 10 is mounted on a machining head of a lathe and the workpiece W is mounted on a clamping device of the lathe. Then, as shown in the Fig. 16, the clamping device is rotated to rotate the workpiece W around its axial center S (first step). Then, as in the example shown in Fig. 17, the cutting unit 10 is brought close to an end surface of the workpiece W and moved along the axial center S of the workpiece W. By bringing the cutting edge 44 of the cutting insert 18 close to the workpiece W, bringing the cutting insert 18 into contact with the rotating workpiece W, and cutting the workpiece W (second step), the machined surface Wf can be formed on the workpiece W.

[0069] Afterwards, as in the Fig.16, by moving the cutting unit 10 in a direction away from the axial center S of the workpiece W, the cutting edge 44 of the cutting insert 18 is separated from the workpiece W (third step). This completes the cutting of the workpiece W and ensures that the cut article M, which is the cut workpiece W, is manufactured. Since the cutting unit 10 has excellent cutting capabilities due to the reasons described above, the cut article M having excellent machining accuracy can be manufactured.

[0070] As cutting continues, the cutting edge 44 of the cutting insert 18 may be repeatedly brought into contact with another portion of the workpiece W while rotating the workpiece W. Although the cutting edge 44 of the cutting insert 18 is brought close to the workpiece W in the embodiment of the present disclosure, the cutting edge 44 of the cutting insert 18 only needs to be brought relatively close to the workpiece W. As such, the same operation is performed as long as the cutting edge 44 of the cutting insert 18 is separated from the workpiece W.

[0071] According to one embodiment (1), a cutting unit has a quadrangular prism shape extending from a front end toward a rear end, and includes a holder having a front end surface located on one side of the front end, an upper surface extending from the front end surface toward the rear end, a lower surface located on a side opposite the upper surface, a first side surface located between the upper surface and the lower surface and extending from the front end surface to the rear end, and a second side surface located on a side opposite the first side surface, a cutting edge located at the front end and on one side of the first side surface, a holding block having a groove configured to hold the holder, and a clamping member disposed on the holding block.wherein the clamping member has a pressing portion and is configured to fix the holder to the holding block, and wherein the pressing portion is configured, in a state of being interposed between an inner side surface of the groove and the upper surface, to press the holder to one side of another inner side surface of the groove. The upper surface has a first recess having a first inclined surface that is increasingly separated from the lower surface as it approaches one side of the rear end, and a second recess that is located closer to the rear end than the first recess and has a second inclined surface that is increasingly separated from the lower surface as it approaches the rear end side. The pressing portion has a first projection configured to be in contact with the first inclined surface and a second projection,which is separated from the first projection and configured to be in contact with the second inclined surface.,

[0072] (2) In the cutting unit according to (1) described above, the first recess and the second recess may be open on the first side surface and the second side surface, respectively.

[0073] (3) In the cutting unit according to (1) or (2) described above, the first side surface may be in contact with a bottom surface of the groove.

[0074] (4) In the cutting unit according to any one of the above-described (1) to (3), a width, in a longitudinal direction, of the holder at the first recess may be larger on a second side surface side than on the first side surface side.

[0075] (5) In the cutting unit according to any one of the above-described (1) to (4), a depth of the first recess may be deeper on a second side surface side than on the first side surface side.

[0076] (6) In the cutting unit according to any one of the above-described (1) to (5), a depth of the second recess may be deeper on a second side surface side than on the first side surface side, and in a cross section orthogonal to the longitudinal direction of the holder, an inclination angle of the first inclined surface with respect to a virtual line parallel to the lower surface may be larger than an inclination angle of the second inclined surface with respect to the virtual line parallel to the lower surface.

[0077] (7) In the cutting unit according to any one of the above-described (1) to (6), a maximum value of a depth of the first recess may be larger than a maximum value of a depth of the second recess.

[0078] (8) In the cutting unit according to any one of the above-described (1) to (7), the first protrusion may have a first contact surface configured to be in contact with the first inclined surface, and the first inclined surface may be a flat surface and the first contact surface may be a protruding curved surface.

[0079] (9) In the cutting unit according to any one of the above-described (1) to (7), the first protrusion may have a first contact surface configured to be in contact with the first inclined surface, and the first inclined surface may be a protruding curved surface and the first contact surface may be a flat surface.

[0080] (10) In the cutting unit according to any one of the above-described (1) to (9), in a cross section along a longitudinal direction of the clamping member, a width of the first recess may be larger than a width of the first projection.

[0081] (11) A cutting tool has a quadrangular prism shape extending from a front end toward a rear end, and includes a holder having a front end surface disposed on one side of the first end, an upper surface extending from the front end surface toward the rear end, a lower surface disposed on a side opposite to the upper surface, a first side surface disposed between the upper surface and the lower surface and extending from the front end surface toward the rear end, and a second side surface disposed on a side opposite to the first side surface, and a cutting edge disposed on the front end and on one side of the first side surface.The upper surface has a first recess having a first inclined surface that is increasingly separated from the lower surface as it approaches a side of the rear end, the first recess being open at the first side surface and the second side surface, and a second recess that is located closer to the rear end than the first recess and has a second inclined surface that is increasingly separated from the lower surface as it approaches the side of the rear end, the second recess being open at the first side surface and the second side surface.

[0082] (12) A cutting tool rest to which the above-described cutting tool according to (11) is attachable includes a holding block having a groove configured to hold a holder of the cutting tool, and a clamping member disposed on the holding block. The clamping member includes a pressing portion configured to fix the holder to the holding block. The pressing portion is configured to press the holder toward one side of another inner side surface of the groove in a state of being interposed between an inner side surface of the groove and the upper surface. The pressing portion includes a first protrusion configured to contact the first inclined surface and a second protrusion separated from the first protrusion and configured to contact the second inclined surface.

[0083] (13) A method for producing a cut article comprises rotating a workpiece, bringing the cutting edge of the cutting unit according to any one of claims 1 to 10 into contact with the rotating workpiece, and separating the cutting edge of the cutting unit from the workpiece.

[0084] In the present disclosure, the invention has been described above with reference to the drawings and the embodiment. However, the invention according to the present disclosure is not limited to the embodiment described above. In other words, the invention according to the present disclosure can be modified in various ways within the scope shown in the present disclosure, and embodiments achieved by appropriately combining the technical means disclosed in various embodiments are also included in the technical scope of the invention according to the present disclosure. In other words, it should be noted that those skilled in the art can easily make various variations or modifications based on the present disclosure. Note that such variations or modifications are included within the scope of the present disclosure. REFERENCE SYMBOL 10 Cutting unit 12 cutting tools 14 Cutting tool support 16 holders 16a Front end 16b Rear end 16m body section 18 cutting insert 20 clamping screw 22 Front end face 24 Rear end face 26 Upper surface 28 Lower surface 30 First side surface 32 Second side surface 34 bag 36 screw holes 38 First deployment area 40 Second application area 42 Insert side surface 44 cutting edge 46 Holding block 48 clamping element 50 fixing screw 52 grooves 52a Floor area 52b One inner side surface (first inner side surface) 52c Other inner side surface (second inner side surface) 52g guide surface 52s center line 54 screw hole 56 Attachment piece (attachment section) 58 through hole 60 Press piece (press section) 60f sliding surface 62 Stepped section 64 First recess 64f First inclined surface 66 Second recess 66f Second inclined surface 68 First lead 68f First contact surface 70 Second lead 70f Second contact surface QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 02-048164

[0004]

Claims

[1] A cutting unit having a quadrangular prism shape extending from a front end toward a rear end, the cutting unit comprising: a holder that has a front end surface arranged on one side of the front end, an upper surface extending from the front end surface towards the rear end, a lower surface arranged on a side opposite to the upper surface, a first side surface disposed between the upper surface and the lower surface and extending from the front end surface toward the rear end, and a second surface arranged on a side opposite to the first side surface, a cutting edge arranged at the front end and on one side of the first side surface, a holding block having a groove configured to hold the holder, and a clamping member arranged on the holding block, wherein the clamping member has a pressing portion and is configured to fix the holder to the holding block, and wherein the pressing portion is configured to press the holder toward a side of another inner side surface of the groove in a state of being interposed between an inner side surface of the groove and the upper surface, wherein the upper surface has a first recess having a first inclined surface that is increasingly separated from the lower surface as it approaches one side of the rear end, and a second recess disposed closer to the rear end than the first recess and having a second inclined surface which is increasingly separated from the lower surface as it approaches the rear end side, and the pressing area has a first projection configured to come into contact with the first inclined surface, and a second projection separate from the first projection and configured to contact the second inclined surface. [2] The cutting unit according to claim 1, wherein the first recess and the second recess are open on the first side surface and the second side surface, respectively. [3] The cutting unit according to claim 1 or 2, wherein the first side surface comes into contact with a bottom surface of the groove. [4] The cutting unit according to any one of claims 1 to 3, wherein a width, in a longitudinal direction, of the holder at the first recess on one side of the second side surface is greater than at the side of the first side surface. [5] The cutting unit according to any one of claims 1 to 4, wherein a depth of the first recess is greater on a side of the second side surface than on the side of the first side surface. [6] The cutting unit according to any one of claims 1 to 5, wherein a depth of the second recess on one side of the second side surface is deeper than on the side of the first side surface and in a cross-section orthogonal to the longitudinal direction of the holder, an inclination angle of the first inclined surface with respect to a virtual line parallel to the lower surface is greater than an inclination angle of the second inclined surface with respect to the virtual line parallel to the lower surface. [7] The cutting unit according to any one of claims 1 to 6, wherein a maximum value of a depth of the first recess is greater than a maximum value of a depth of the second recess. [8] The cutting unit according to any one of claims 1 to 7, wherein the first projection has a first contact surface configured to come into contact with the first inclined surface, and the first inclined surface is a flat surface and the first contact surface is a convex curved surface. [9] The cutting unit according to any one of claims 1 to 7, wherein the first projection has a first contact surface configured to come into contact with the first inclined surface, and the first inclined surface is a convex curved surface and the first contact surface is a flat surface. [10] The cutting unit according to any one of claims 1 to 9, wherein in a cross section along a longitudinal direction of the clamping member, a width of the first recess is larger than a width of the first projection. [11] A cutting tool having a quadrangular prism shape extending from a front end toward a rear end, the cutting tool comprising: a holder that has a front surface disposed on one side of the first end, an upper surface extending from the front end surface towards the rear end, a lower surface arranged on a side opposite to the upper surface, a first side surface disposed between the upper surface and the lower surface and extending from the front end surface toward the rear end, and a second surface arranged on a side opposite to the first side surface, and a cutting edge disposed at the front end and on one side of the first surface, wherein the upper surface has a first recess having a first inclined surface that is increasingly separated from the lower surface as it approaches one side of the rear end, the first recess being open at the first side surface and the second side surface, and a second recess disposed closer to the rear end than the first recess and having a second inclined surface that is increasingly separated from the lower surface as it is closer to the side of the rear end, the second recess being open at the first side surface and the second side surface. [12] A cutting tool support to which the cutting tool according to claim 11 is attachable, the cutting tool support comprising: a holding block having a groove configured to hold a holder of the cutting tool, and a clamping member arranged on the holding block, wherein the clamping member has a pressing portion and is configured to fix the holder to the holding block, and wherein the pressing portion is configured to press the holder toward a side of another inner side surface of the groove in a state of being interposed between an inner side surface of the groove and the upper surface, wherein the pressing section has a first projection configured to come into contact with the first inclined surface, and a second projection separate from the first projection and configured to contact the second inclined surface. [13] A method of manufacturing a cut article, the method comprising: Turning a workpiece, bringing the cutting edge of the cutting unit according to any one of claims 1 to 10 into contact with the rotating workpiece, and Separating the cutting edge of the cutting unit from the workpiece.

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