Cutting unit, cutting tool, tool holder, and method for manufacturing cut workpiece

Abstract

To improve workability of attachment work of a shank with respect to a holder, and to stably hold the shank by the holder. The clamping member has a pressing portion that presses the shank toward the inner side surface of the other side of the groove in a state of being sandwiched between the inner side surface of one side of the groove of the holder and the upper surface of the shank. The pressing part is provided with a first protruding part which abuts against the first inclined surface of the first notch part of the knife handle; and a second protruding part which is separated from the first protruding part and abuts against the second inclined surface of the second notch part of the knife handle.

Description

Technical Field

[0001] The present disclosure relates to a cutting unit, a cutting tool, a tool holder, and a method for manufacturing a cut product for cutting a workpiece. Background Art

[0002] When cutting a workpiece made of metal or the like, a cutting unit that can be mounted on a machine tool is used. The cutting unit described in Patent Document 1 has a tool holder (a portion obtained by removing a tool head from a turning tool in Patent Document 1); and a cutting edge located at the front end of the tool holder and on the first side surface. The cutting unit described in Patent Document 1 has a retaining frame (referred to as a turning tool holder in Patent Document 1) having a groove (referred to as a groove in Patent Document 1) for retaining the tool holder; and a clamping member that fixes the tool holder to the retaining frame.

[0003] The clamping member has two fastening bolts screwed to the retaining frame, and pressing blocks connected to the front ends of the two fastening bolts, respectively. The two pressing blocks are clamped between the inner side surface of one side of the groove of the retaining frame and the upper surface of the shank, and press the shank toward the inner side surface of the other side of the groove of the retaining frame. The first pressing block of the two pressing blocks abuts against the inclined surface of the first cutout portion of the two cutout portions (referred to as cutouts in Patent Document 1) of the shank. The second pressing block of the two pressing blocks abuts against the inclined surface of the second cutout portion of the two cutout portions of the shank.

[0004] Prior Art Literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Utility Model Gazette No. 02-048164 Summary of the invention

[0007] The cutting unit disclosed in the present invention comprises a shank, a cutting edge, a holder and a clamping member. The shank is in the shape of a quadrangular prism extending from the front end toward the rear end, and has a front end face located on the front end side, an upper surface extending from the front end face toward the rear end, a lower surface located on the opposite side of the upper surface, a first side surface located between the upper surface and the lower surface and extending from the front end face toward the rear end, and a second side surface located on the opposite side of the first side surface. The cutting edge is located at the front end and on the side of the first side surface. The holder has a groove for holding the shank. The clamping member is located on the holder and has a pressing portion for pressing the shank toward the inner side surface of the other side of the groove when it is clamped between the inner side surface of one side of the groove and the main body, and the clamping member fixes the shank to the holder. The upper surface has: a first cutout portion having a first inclined surface that moves away from the lower surface as it approaches the rear end; and a second cutout portion located at a position closer to the rear end than the first cutout portion and having a second inclined surface that moves away from the lower surface as it approaches the rear end. The pressing portion includes a first protrusion that contacts the first inclined surface, and a second protrusion that is separated from the first protrusion and contacts the second inclined surface.

[0008] The cutting tool disclosed in the present invention comprises a shank and a cutting edge. The shank is in the shape of a quadrangular prism extending from the front end toward the rear end, and has: a front end face located on the front end side, an upper surface extending from the front end face toward the rear end, a lower surface located on the opposite side of the upper surface, a first side surface located between the upper surface and the lower surface and extending from the front end face toward the rear end, and a second side surface located on the opposite side of the first side surface. The cutting edge is located at the front end and on the first side surface. The upper surface has: a first cutout portion, and a second cutout portion located closer to the rear end than the first cutout portion. The first cutout portion has a first inclined surface that moves away from the lower surface as it approaches the rear end side, and is open relative to the first side surface and the second side surface. The second cutout portion has a second inclined surface that moves away from the lower surface as it approaches the rear end side, and is open relative to the first side surface and the second side surface.

[0009] The tool holder disclosed in the present invention is a tool holder capable of mounting the cutting tool disclosed in the present invention, and is provided with a retaining frame and a clamping member. The retaining frame has a groove for retaining a tool shank. The clamping member is located on the retaining frame, and has a pressing portion for pressing the tool shank toward the inner side surface of the other side of the groove when clamped between the inner side surface and the upper surface of one side of the groove, and the clamping member fixes the tool shank to the retaining frame. The pressing portion has: a first protrusion that abuts against a first inclined surface; and a second protrusion that is separated from the first protrusion and abuts against the second inclined surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic perspective view of a cutting unit according to an embodiment of the present disclosure.

[0011] Figure 2 yes Figure 1 A schematic enlarged side view of a cutting unit is shown.

[0012] Figure 3 yes Figure 1 A schematic top view of a cutting unit is shown.

[0013] Figure 4 It is a schematic perspective view of a cutting tool according to an embodiment of the present disclosure.

[0014] Figure 5 yes Figure 4 A schematic top view of a portion of a cutting tool is shown.

[0015] Figure 6 yes Figure 4 A schematic side view of a cutting tool is shown.

[0016] Figure 7 yes Figure 4 A schematic bottom view of a cutting tool is shown.

[0017] Figure 8 Observed from the front Figure 4 A schematic enlarged view of a cutting tool is shown.

[0018] Fig. 9 It is along Figure 2 A schematic enlarged cross-sectional view of the line IX-IX in FIG.

[0019] Fig.10 It is along Figure 6 Schematic enlargement of the X-X line in FIG.

[0020] Fig.11 It is along Figure 6 Schematic enlargement of the XI-XI line in FIG.

[0021] Fig.12 It is a schematic perspective view showing a clamp member and a plurality of fixing bolts.

[0022] Fig.13 It is a schematic perspective view showing a clamp member and a plurality of fixing bolts.

[0023] Fig.14 It is a schematic cross-sectional view along the length direction of the clamp member.

[0024] Fig.15 It is along Figure 3 A schematic cross-sectional view taken along line XV-XV in FIG.

[0025] Fig.16 This is a schematic diagram for explaining a method for producing a machined product according to an embodiment of the present disclosure.

[0026] Fig.17 This is a schematic diagram for explaining a method for producing a machined product according to an embodiment of the present disclosure.

[0027] Fig.18 This is a schematic diagram for explaining a method for producing a machined product according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0028] The two pressing blocks in the cutting unit described in Patent Document 1 exist independently, and respectively adjust the pressing force of the first pressing block on the first cutout portion of the tool holder and the pressing force of the second pressing block on the second cutout portion of the tool holder. Therefore, the deviation between the pressing force of the first pressing block and the pressing force of the second pressing block becomes larger. As a result, the load is concentrated on the pressing block on one side and the fastening bolt on one side, which may lead to a decrease in the aging resistance of the cutting unit. The pressing block on one side becomes a fulcrum, which may cause the position of the tool holder to shift. In order to eliminate these concerns, it is necessary to adjust the fastening force of the two fastening bolts with high precision to reduce the deviation between the pressing force of the first pressing block and the pressing force of the second pressing block. As a result, in the cutting unit described in Patent Document 1, there is a tendency for the installation operation of the tool holder relative to the retaining frame to be complicated.

[0029] Therefore, there is a demand for the development of a cutting unit that can improve the workability of the attachment operation of the tool holder to the holder and stably hold the tool holder by the holder.

[0030] According to one aspect of the present disclosure, the workability of mounting the tool holder to the holder can be improved, and the tool holder can be stably held by the holder.

[0031] Hereinafter, the cutting tool of the embodiment of the present disclosure and the manufacturing method of the cut workpiece are described in detail using the accompanying drawings. However, for the sake of convenience, the following referenced figures only simplify the components required for explaining the embodiment. Therefore, the cutting unit of the embodiment of the present disclosure may have any components not shown in the referenced figures. The dimensions of the components in the figures do not accurately represent the dimensions of the actual components and the dimensional ratios of the components.

[0032] In the present disclosure, description is made based on an orthogonal coordinate system XYZ defined by three mutually orthogonal directions. The X direction refers to the front-to-back direction, one side of the X direction is the front side or the front direction, and the other side of the X direction is the rear side or the rear direction. The Y direction refers to the left-to-right direction, one side of the Y direction is the left side or the left direction, and the other side of the Y direction is the right side or the right direction. The Z direction refers to the up-down direction, one side of the Z direction is the upper side or the upper direction, and the other side of the Z direction is the lower side or the lower direction. In addition, in the present disclosure, orthogonal is not limited to strict orthogonality, but means that an error of ±5 degrees is allowed. Parallel is not limited to strict parallelism, but means that an error of ±5 degrees is allowed.

[0033] In the drawings, “FF” means a front direction, “FR” means a rear direction, “L” means a left direction, “R” means a right direction, “U” means an upper direction, and “D” means a lower direction.

[0034] <Cutting unit 10>

[0035] Reference Figures 1 to 14 The cutting unit 10 according to the embodiment of the present disclosure will be described. Figure 1 1 is a schematic perspective view of a cutting unit 10 according to an embodiment of the present disclosure. Figure 2 yes Figure 1 A schematic enlarged side view of a cutting unit 10 is shown. Figure 3 yes Figure 1 A schematic top view of a cutting unit 10 is shown. Figure 4 It is a schematic perspective view of the cutting tool 12 according to the embodiment of the present disclosure. Figure 5 yes Figure 4 A schematic top view of a portion of a cutting tool 12 is shown. Figure 6 yes Figure 4 A schematic side view of a cutting tool 12 is shown. Figure 7 yes Figure 4 A schematic bottom view of a cutting tool 12 is shown. Figure 8 Observed from the front Figure 4 A schematic enlarged view of a cutting tool 12 is shown. Fig. 9 It is along Figure 2 A schematic enlarged cross-sectional view of the line IX-IX in FIG. Fig.10 It is along Figure 6 Schematic enlargement of the X-X line in FIG. Fig.11 It is along Figure 6 Schematic enlargement of the XI-XI line in FIG. Fig.12 and Fig.13 It is a schematic perspective view showing the clamp member 48 and the plurality of fixing bolts 50 , and is a view seen from different directions. Fig.14 The XIVA is along Fig.12 Schematic cross-sectional view of the XIVA-XIVA line in FIG. Fig.14 The XIVB is along the lines of Fig.12 A schematic cross-sectional view of the line XIVB-XIVB in FIG. Fig.15 It is along Figure 3 A schematic cross-sectional view taken along line XV-XV in FIG.

[0036] like Figures 1 to 3 As shown in the example, the cutting unit 10 of the embodiment of the present disclosure is used for a workpiece W (see Fig.16). The cutting process of the workpiece W includes outer diameter processing, grooving processing, and cutting processing. In addition, the cutting unit 10 may include: a cutting tool 12, which is used to cut the workpiece W; and a tool holder 14, which can mount the cutting tool 12.

[0037] like Figures 4 to 7 As shown in the example, the cutting tool 12 may include: a shank 16 mounted on the tool holder 14; a cutting blade 18 held by the shank 16; and a clamping screw 20 that fixes the cutting blade 18 to the shank 16. In addition, the shank 16 may be in the shape of a quadrangular prism extending from the front end 16a toward the rear end 16b along the X direction. The length direction of the shank 16 may be the X direction.

[0038] In the present disclosure, the handle 16 being in a quadrangular prism shape is not limited to being in a strict quadrangular prism shape, and also includes a case where the handle 16 includes a quadrangular prism-shaped main body 16m and can be visually confirmed as being in a substantially quadrangular prism shape as a whole. One end of the main body 16m of the handle 16 may be located closer to the rear end 16b than the front end 16a of the handle 16. The other end of the main body 16m of the handle 16 may be consistent with the rear end 16b of the handle 16. The main body 16m held by the tool holder is also called a shank.

[0039] like Figures 4 to 8 As shown in the example, the handle 16 may have a front end face 22 located on the side of the front end 16a and a rear end face 24 located on the opposite side of the front end face 22. The front end face 22 of the handle 16 is not limited to a single plane and may include multiple planes and / or curved surfaces. The handle 16 may have an upper surface 26 extending from the front end face 22 toward the rear end 16b along the X direction to the rear end face 24. The handle 16 may have a lower surface 28 located on the opposite side of the upper surface 26, and the lower surface 28 may extend from the front end face 22 toward the rear end 16b along the X direction to the rear end face 24.

[0040] like Figures 4 to 6 as well as Figure 8 As shown, the handle 16 may have a first side surface 30 located between the upper surface 26 and the lower surface 28, and the first side surface 30 may extend from the front end surface 22 toward the rear end 16b along the X direction to the rear end surface 24. The first side surface 30 of the handle 16 may be connected to the upper surface 26 and the lower surface 28. In the main body 16m of the handle 16, the first side surface 30 may be orthogonal to the lower surface 28 and the upper surface 26. It should be noted that Figure 6 This is a diagram of the first side surface 30 as viewed from the front.

[0041] The handle 16 may have a second side surface 32 located on the opposite side of the first side surface 30, and the second side surface 32 may extend from the front end surface 22 toward the rear end 16b along the X direction to the rear end surface 24. The second side surface 32 of the handle 16 may be connected to the upper surface 26 and the lower surface 28. In the main body 16m of the handle 16, the second side surface 32 may be orthogonal to the lower surface 28 and the upper surface 26. It should be noted that Figure 2 This is a diagram of the second side surface 32 as viewed from the front.

[0042] like Figures 4 to 6 and Figure 8 As shown, the tool handle 16 may have a tool groove 34 for holding the cutting blade 18 on the front end 16a side. The tool groove 34 of the tool handle 16 may be open on the front end face 22, the upper surface 26 and the first side surface 30. The tool handle 16 may have a screw hole 36 located on the front end 16a side (refer to Figure 7 The screw hole 36 of the handle 16 may be open relative to the knife groove 34 and the lower surface 28 .

[0043] Examples of the material of the handle 16 include metals such as stainless steel, carbon steel, cast iron, and aluminum alloy. The length of the handle 16 can be set to, for example, 100 mm to 400 mm.

[0044] like Figures 4 to 6 and Figure 8 As shown, the cutting blade 18 can be located in the knife groove 34 of the shank 16. The cutting blade 18 can be a replaceable blade called a non-regrinding blade. The cutting blade 18 can be in a square plate shape, a triangular plate shape or a pentagonal plate shape other than the square plate shape. The cutting blade 18 can have a first blade face 38, a second blade face 40 located on the opposite side of the first blade face 38, and a plurality of blade side faces 42 located between the first blade face 38 and the second blade face 40.

[0045] The cutting insert 18 may have a cutting edge 44 at the intersection of the first blade face 38 and the blade side 42. The cutting edge 44 may be located at the front end 16a of the tool holder 16 and on the side of the first side 30. The first blade face 38 may function as a rake face for flowing the chips. The portion of the first blade face 38 that functions as a rake face may be substantially parallel to the upper surface 26 of the tool holder 16. The blade side 42 may function as a flank face.

[0046] The cutting insert 18 may have a through hole opened at the first blade face 38 and the second blade face 40. The through hole of the cutting insert 18 may match the screw hole 36 of the tool holder 16. The cutting insert 18 is mounted on the blade groove 34 of the tool holder 16 by screwing the clamping screw 20 inserted into the through hole of the cutting insert 18 into the screw hole 36 of the tool holder 16 and tightening the clamping screw 20.

[0047] As the material of the cutting blade 18, for example, cemented carbide or cermet can be cited. As the composition of cemented carbide, for example, WC-Co, WC-TiC-Co and WC-TiC-TaC-Co can be cited. WC-Co is produced by adding cobalt (Co) powder to tungsten carbide (WC) and sintering. 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. In addition, cermet is a sintered composite material formed by compounding metal and ceramic components. Specifically, as cermet, cermet with titanium compounds such as titanium carbide (TiC) and titanium nitride (TiN) as the main component can be cited.

[0048] The surface of the cutting insert 18 can be coated with a coating using a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method. Examples of the coating material include titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), and aluminum oxide (Al 2 O 3 )wait.

[0049] The aforementioned cutting tool 12 is composed of a tool holder 16 and a cutting insert 18, but an integral cutting tool composed of one member may also be used.

[0050] like Figures 1 to 3 As shown in the example, the tool holder 14 of the embodiment of the present disclosure may include a holder 46, a clamp member 48 for fixing the tool handle 16 to the holder 46, and a plurality of fixing bolts 50 for attaching the clamp member 48 to the holder 46. The holder 46 is attached to a machining head of a lathe.

[0051] The holder 46 may have a plurality of grooves 52 for holding (accommodating) the main body 16m of the shank 16, and the plurality of grooves 52 may be arranged at intervals in the Z direction. The grooves 52 of the holder 46 may extend in the X direction. Both ends of the grooves 52 in the X direction of the holder 46 may be open respectively. The number of grooves 52 of the holder 46 may be one.

[0052] like Figures 1 to 3 and Fig. 9 As shown in the example, the groove 52 of the retainer 46 may have a bottom surface 52a and a pair of inner side surfaces 52b and 52c rising from both sides of the bottom surface 52a. One inner side surface (first inner side surface) 52b of the groove 52 of the retainer 46 may have a guide surface 52g. The guide surface 52g of the groove 52 of the retainer 46 may be inclined with respect to the depth direction (direction parallel to the Y direction) of each groove 52 so as to approach the center line 52s of the groove 52 as it approaches the bottom surface 52a.

[0053] The bottom surface 52a of the groove 52 of the holder 46 can abut against the first side surface 30 of the shank 16. The other inner side surface (second inner side surface) 52c of the groove 52 of the holder 46 can abut against the lower surface 28 of the shank 16. In other words, the first side surface 30 of the shank 16 can abut against the bottom surface 52a of the groove 52 of the holder 46. The lower surface 28 of the shank 16 can abut against the other inner side surface 52c of the groove 52 of the holder 46.

[0054] like Figures 1 to 3 As shown in the example, the retainer 46 may have a plurality of screw holes 54 for screwing the fixing bolts 50 at one edge of each groove 52. Examples of the material of the retainer 46 include metals such as stainless steel, carbon steel, and cast iron.

[0055] like Figure 1 , Figure 2 as well as Fig. 9 As shown in the example, the clamp member 48 may be located at one edge of the groove 52 of the holder 46. The clamp member 48 may be mounted to one edge of the groove 52 of the holder 46 by a plurality of fixing bolts 50. The clamp member 48 may extend along the X direction, and the shape of the clamp member 48 when viewed from the X direction may be an L-shape.

[0056] The clamp member 48 may include a mounting piece 56 as a mounting portion that can be mounted on one edge of the groove 52 of the retainer 46, and the mounting piece 56 may extend in the X direction. The mounting piece 56 may include a plurality of through holes 58 (see FIG. 5 ) for inserting the fixing bolts 50. Fig.14 ), the plurality of through holes 58 may be arranged at intervals in the X direction. Each through hole 58 of the mounting piece 56 may match each screw hole 54 of the retaining frame 46.

[0057] like Figure 2 and Fig. 9 As shown in the example, the clamping member 48 may include a pressing piece 60 as a pressing portion for pressing the shank 16 toward the other inner side surface (second inner side surface) 52c side of the groove 52 of the holder 46. The pressing piece 60 may press the shank 16 toward the other inner side surface 52c side of the groove 52 of the holder 46 in a state where it is sandwiched between the inner side surface (first inner side surface) 52b of one side of the groove 52 of the holder 46 and the upper surface 26 of the shank 16. The pressing piece 60 may extend in the X direction or may be protrudingly provided at the edge of the mounting piece 56. The protruding direction of the mounting piece 56 may also be the Y direction.

[0058] like Fig. 9As shown in the example, the pressing piece 60 may have a sliding surface 60f that slides on the guide surface 52g of the groove 52 of the retainer 46. The sliding surface 60f of the pressing piece 60 may be inclined relative to the protruding direction of the pressing piece 60 so as to approach the center line 52s of the groove 52 of the retainer 46 toward the protruding direction of the pressing piece 60. Examples of the material of the clamping member 48 include metals such as stainless steel, carbon steel, and cast iron.

[0059] By screwing the fixing bolts 50 inserted through the through holes 58 of the mounting piece 56 into the screw holes 54 of the holder 46 and tightening them, a wedge effect is exerted by the sliding surface 60f of the pressing piece 60 of the clamp member 48 and the guide surface 52g of the groove 52 of the holder 46. Thus, the pressing piece 60 of the clamp member 48 presses the shank 16 toward the other inner side surface 52c of the groove 52 of the holder 46, and the shank 16 can be fixed to the holder 46.

[0060] like Figure 2 , Figure 6 and Figure 7 As shown in the example, the lower surface 28 of the handle 16 may have a step portion 62 that is convexly curved toward the rear end 16b. The step portion 62 of the handle 16 may abut against the end surface 48e of the holder 46. When the main body 16m of the handle 16 is held in the groove 52 of the holder 46, the step portion 62 of the handle 16 abuts against the end surface 48e of the holder 46, thereby positioning the handle 16 relative to the groove 52 of the holder 46.

[0061] like Figures 4 to 6 As shown in the example, the upper surface 26 of the handle 16 may have a first cutout portion 64 located at one end side of the main body portion 16m. The first cutout portion 64 of the handle 16 may have a first inclined surface 64f inclined relative to an imaginary plane VF parallel to the lower surface 28 so as to be away from the lower surface 28 as it approaches the rear end 16b. The first cutout portion 64 of the handle 16 may be open relative to the first side surface 30 and the second side surface 32.

[0062] like Figures 4 to 6 As shown in the example, the upper surface 26 of the handle 16 may have a second cutout portion 66 located closer to the rear end 16b than the first cutout portion 64. The second cutout portion 66 of the handle 16 may have a second inclined surface 66f inclined relative to the imaginary plane VF parallel to the lower surface 28 so as to be away from the lower surface 28 as it approaches the rear end 16b. The second cutout portion 66 of the handle 16 may be open relative to the first side surface 30 and the second side surface 32.

[0063] like Figure 5As shown in the example, the width B1 of the handle 16 in the length direction, i.e., the X direction, at the first cutout portion 64 of the handle 16 may be larger on the second side 32 side than on the first side 30 side. The width B2 of the handle 16 in the X direction in the second cutout portion 66 may be larger on the second side 32 side than on the first side 30 side.

[0064] like Fig.10 and Fig.11 As shown in the example, the depth D1 of the first cutout portion 64 of the handle 16 may be deeper on the second side 32 side than on the first side 30 side. The depth D2 of the second cutout portion 66 of the handle 16 may be deeper on the second side 32 side than on the first side 30 side. In the cross section of the handle 16 orthogonal to the longitudinal direction, the inclination angle θ1 of the first inclined surface 64f of the first cutout portion 64 with respect to the imaginary plane VF parallel to the lower surface 28 may be greater than the inclination angle θ2 of the second inclined surface 66f of the second cutout portion 66 with respect to the imaginary plane VF parallel to the lower surface 28. The maximum value of the depth D1 of the first cutout portion 64 of the handle 16 may be greater than the maximum value of the depth D2 of the second cutout portion 66.

[0065] like Figure 12 to Figure 14 As shown in the example, the pressing piece 60 may have a first protrusion 68 that abuts against the first inclined surface 64f of the first cutout portion 64 of the handle 16, and the first protrusion 68 may protrude in a direction orthogonal to the length direction of the clamping member 48. The first protrusion 68 of the pressing piece 60 may be located on the side of the end portion 48a of one side of the clamping member 48. The first protrusion 68 of the pressing piece 60 may have a first abutting surface 68f that abuts against the first inclined surface 64f of the first cutout portion 64 of the handle 16.

[0066] like Fig.14 As shown in the example, in the cross section of the clamping member 48 along the longitudinal direction, the width B1 of the first cutout portion 64 of the handle 16 can be larger than the width T1 of the first protrusion 68 of the pressing piece 60. The first inclined surface 64f of the first cutout portion 64 of the handle 16 can be a flat surface, and the first abutting surface 68f of the first protrusion 68 of the pressing piece 60 can be a convex surface. Alternatively, the first inclined surface 64f of the first cutout portion 64 of the handle 16 can also be a convex surface, and the first abutting surface 68f of the first protrusion 68 of the pressing piece 60 can also be a flat surface.

[0067] The pressing piece 60 may include a second protrusion 70 that abuts against the second inclined surface 66f of the second cutout portion 66 of the handle 16, and the second protrusion 70 may protrude in a direction perpendicular to the length direction of the clamping member 48. The second protrusion 70 of the pressing piece 60 may be located farther away from the first protrusion 68 toward the other end 48b of the clamping member 48. The second protrusion 70 of the pressing piece 60 may include a second abutting surface 70f that abuts against the second inclined surface 66f of the second cutout portion 66 of the handle 16.

[0068] like Fig.14 As shown in the example, in the cross section along the length direction of the clamping member 48, the width B2 of the second cutout portion 66 of the handle 16 can be larger than the width T2 of the second protrusion 77 of the pressing piece 60. The second inclined surface 66f of the second cutout portion 66 of the handle 16 can be a flat surface, and the second abutting surface 70f of the second protrusion 70 of the pressing piece 60 can be a convex surface. Alternatively, the second inclined surface 66f of the second cutout portion 66 of the handle 16 can also be a convex surface, and the second abutting surface 70f of the second protrusion 70 of the pressing piece 60 can also be a flat surface.

[0069] According to the example of the embodiment of the present disclosure, the pressing piece 60 includes the first protrusion 68 that abuts against the first inclined surface 64f of the first notch portion 64 of the handle 16 and the second protrusion 70 that abuts against the second inclined surface 66f of the second notch portion 66 of the handle 16. Therefore, it is not necessary to adjust the pressing force of the first protrusion 68 of the pressing piece 60 with respect to the first notch portion 64 of the handle 16 and the pressing force of the second protrusion 70 of the pressing piece 60 with respect to the second notch portion 66 of the handle 16 separately, and they can be adjusted at one time. As a result, the deviation of 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 can be reduced, and the handle 16 can be easily mounted on the holder 46. Therefore, according to the example of the embodiment of the present disclosure, the workability of the mounting operation of the handle 16 with respect to the holder 46 can be improved, and the handle 16 can be stably held by the holder 46. In other words, the workability of mounting the cutting tool 12 to the tool holder 14 can be improved, and the cutting tool 12 can be stably held by the tool holder 14 .

[0070] When the first cutout 64 and the second cutout 66 of the handle 16 are open to 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 cutout 64 and the second inclined surface 66f of the second cutout 66 of the handle 16, respectively. Thus, the workability of the installation operation of the handle 16 to the holder 46 can be further improved.

[0071] When the first side surface 30 of the tool holder 16 near the cutting edge 44 abuts against the bottom surface 52a of the groove 52 of the holder 46, the holder 46 can easily receive the chatter during cutting. As a result, the chatter can be reduced and the machined surface Wf of the workpiece W can be improved (see Fig.17 as well as Fig.18 )’s surface roughness.

[0072] When the width B1 in the X direction of the first cutout portion 64 of the tool handle 16 is made larger on the second side surface 32 side than on the first side surface 30 side, the first protrusion 68 of the pressing piece 60 can be easily brought into contact with the first inclined surface 64f of the first cutout portion 64 of the tool handle 16. Thus, the workability of the tool handle 16 in the mounting operation with respect to the holder 46 can be further improved.

[0073] When the width B2 in the X direction of the second cutout portion 66 of the tool handle 16 is made 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 cutout portion 66 of the tool handle 16. Thus, the workability of the tool handle 16 to be mounted on the holder 46 can be further improved.

[0074] When the depth D1 of the first cutout 64 of the handle 16 is deeper on the second side surface 32 than on the first side surface 30, the first protrusion 68 of the pressing piece 60 can be easily brought into contact with the first inclined surface 64f of the first cutout 64 of the handle 16. Thus, the workability of the installation operation of the handle 16 with respect to the holder 46 can be further improved.

[0075] When the depth D2 of the second cutout 66 of the handle 16 is deeper on the second side surface 32 than on the first side surface 30, the second protrusion 70 of the pressing piece 60 can be easily brought into contact with the second inclined surface 66f of the second cutout 66 of the handle 16. Thus, the workability of the installation of the handle 16 to the holder 46 can be further improved.

[0076] In particular, in a cross section perpendicular to the longitudinal direction of the tool holder 16, when the inclination angle θ1 of the first inclined surface 64f of the first notch portion 64 is greater than the inclination angle θ2 of the second inclined surface 66f of the second notch portion 66, the tool holder 16 can be firmly fixed to the holder 46 by using the first notch portion 64 close to the cutting edge 44. As a result, the machining accuracy of the cutting machining of the workpiece W can be improved.

[0077] When the maximum value of the depth D1 of the first notch 64 of the shank 16 is greater than the maximum value of the depth D2 of the second notch 66, the shank 16 can be firmly fixed to the holder 46 by the first notch 64 close to the cutting edge 44. Thus, the machining accuracy of the workpiece W can be improved.

[0078] In the cross section along the longitudinal direction of the clamp member 48, when the width B1 of the first cutout portion 64 of the shank 16 is larger than the width T1 of the first protrusion 68 of the pressing piece 60, the first protrusion 68 of the pressing piece 60 can be easily brought into contact with the first inclined surface 64f of the first cutout portion 64 of the shank 16. Thus, the workability of the installation operation of the shank 16 with respect to the holder 46 can be further improved.

[0079] In the cross section along the longitudinal direction of the clamp member 48, when the width B2 of the second cutout portion 66 of the shank 16 is larger than the width T2 of the second protrusion 77 of the pressing piece 60, the second protrusion 70 of the pressing piece 60 can be easily brought into contact with the second inclined surface 66f of the second cutout portion 66 of the shank 16. Thus, the workability of the installation operation of the shank 16 with respect to the holder 46 can be further improved.

[0080] When the first inclined surface 64f of the first cutout portion 64 of the tool holder 16 is a flat surface and the first contact surface 68f of the first protrusion 68 of the pressing piece 60 is a convex surface, even if the first cutout portion 64 and the first protrusion 68 are not processed under strict manufacturing conditions, the first contact surface 68f of the first protrusion 68 can be stably contacted with the first inclined surface 64f of the first cutout portion 64. Thus, the manufacturing cost of the cutting unit 10 can be reduced.

[0081] When the first inclined surface 64f of the first cutout portion 64 of the tool holder 16 is a convex surface and the first contact surface 68f of the first protrusion 68 of the pressing piece 60 is a flat surface, even if the first cutout portion 64 and the first protrusion 68 are not processed under strict manufacturing conditions, the first contact surface 68f of the first protrusion 68 can be stably contacted with the first inclined surface 64f of the first cutout portion 64. Thus, the manufacturing cost of the cutting unit 10 can be reduced.

[0082] When the first inclined surface 64f of the first cutout portion 64 of the shank 16 and the first contact surface 68f of the first protrusion 68 of the pressing piece 60 are respectively flat surfaces, it is necessary to ensure the parallelism of the first contact surface 68f of the first cutout portion 64 and the first inclined surface 64f of the first protrusion 68 so that the first contact surface 68f of the first cutout portion 64 and the first protrusion 68 are in surface contact with each other. Therefore, in the above case, the first cutout portion 64 and the first protrusion 68 need to be processed under strict manufacturing conditions.

[0083] When the second inclined surface 66f of the second cutout portion 66 of the shank 16 is a flat surface and the second contact surface 70f of the second protrusion 70 of the pressing piece 60 is a convex surface, even if the second cutout portion 66 and the second protrusion 70 are not processed under strict manufacturing conditions, the second contact surface 70f of the second protrusion 70 can be stably contacted with the second inclined surface 66f of the second cutout portion 66. Thus, the manufacturing cost of the cutting unit 10 can be reduced.

[0084] When the second inclined surface 66f of the second cutout portion 66 of the tool holder 16 is a convex surface and the second contact surface 70f of the second protrusion 70 of the pressing piece 60 is a flat surface, even if the second cutout portion 66 and the second protrusion 70 are not processed under strict manufacturing conditions, the second contact surface 70f of the second protrusion 70 can be stably contacted with the second inclined surface 66f of the second cutout portion 66. Thus, the manufacturing cost of the cutting unit 10 can be reduced.

[0085] When the second inclined surface 66f of the second cutout portion 66 of the shank 16 and the second contact surface 70f of the second protrusion 70 of the pressing piece 60 are respectively flat surfaces, it is necessary to ensure the parallelism of the second inclined surface 66f of the second cutout portion 66 and the second contact surface 70f of the second protrusion 70 so that the second inclined surface 66f of the second cutout portion 66 and the second protrusion 70 are in surface contact with each other. Therefore, in the above case, the second cutout portion 66 and the second protrusion 70 need to be processed under strict manufacturing conditions.

[0086] <Method for manufacturing machined product>

[0087] Reference Figures 16 to 18 A method for producing a machined product according to an embodiment of the present disclosure will be described. Figures 16 to 18 It is a schematic diagram for explaining the method for producing a machined product according to an embodiment of the present disclosure.

[0088] like Figures 16 to 18 As shown in the example, the method for manufacturing a cut workpiece of the embodiment of the present disclosure is a method for manufacturing a cut workpiece W, i.e., a cut workpiece M, which has been cut, and includes a first step, a second step, and a third step. The first step refers to a step of rotating the cut workpiece W around its axis S. The second step refers to a step of cutting the cut workpiece W by bringing the cutting edge 44 of the cutting blade 18 in the cutting unit 10 into contact with the rotating cut workpiece W. The third step refers to a step of separating the cutting edge 44 of the cutting blade 18 from the cut cut workpiece W. As the material of the cut workpiece W, for example, stainless steel, carbon steel, alloy steel, cast iron, and non-ferrous metals can be cited. In addition, the specific contents of the method for manufacturing a cut workpiece of the embodiment are as follows.

[0089] First, the cutting unit 10 is mounted on the machining head of the lathe, and the workpiece W is mounted on the chuck of the lathe. Fig.16 As shown in the example, the chuck is rotated to rotate the workpiece W around its axis S (first step). Fig.17 As shown in the example, the cutting unit 10 is moved close to the end surface of the workpiece W and along the axis S of the workpiece W. As a result, the cutting edge 44 of the cutting insert 18 is brought close to the workpiece W, the cutting insert 18 is brought into contact with the rotating workpiece W, and the workpiece W is cut (second step), so that a processed surface Wf can be formed on the workpiece W.

[0090] Then, if Fig.16 As shown in the example, the cutting unit 10 is moved in a direction away from the axis S of the workpiece W, so that the cutting edge 44 of the cutting insert 18 is separated from the workpiece W (third step). As a result, the cutting process of the workpiece W is completed, and the workpiece W after the cutting process, that is, the machined product M can be manufactured. Since the cutting unit 10 has excellent cutting ability for the reasons described above, it is possible to manufacture the machined product M with excellent machining accuracy.

[0091] When the cutting process is continued, the cutting edge 44 of the cutting insert 18 can be repeatedly brought into contact with different parts of the cut material W while the cut material W is rotated. In the embodiment of the present disclosure, the cutting edge 44 of the cutting insert 18 is brought close to the cut material W, but it is sufficient that the cutting edge 44 of the cutting insert 18 is relatively close to the cut material W, so the cut material W can also be brought close to the cutting edge 44 of the cutting insert 18. In this regard, the same is true when the cutting edge 44 of the cutting insert 18 is separated from the cut material W.

[0092] In one embodiment, (1) the cutting unit comprises: a tool holder having a quadrangular prism shape extending from a front end toward a rear end and having a front end face located on the front end side, an upper surface extending from the front end face toward the rear end, a lower surface located on the opposite side of the upper surface, a first side surface located between the upper surface and the lower surface and extending from the front end face toward the rear end, and a second side surface located on the opposite side of the first side surface; a cutting edge located at the front end and located on the first side surface; a holder having a groove for holding the tool holder; and a clamping member located on the holder and having a pressing portion for pressing the tool holder toward the inner side surface of the other side of the groove in a state of being clamped between an inner side surface of one side of the groove and the upper surface, the clamping member fixing the tool holder to the holder. The upper surface has: a first notch portion having a first inclined surface that moves away from the lower surface as it approaches the rear end; and a second notch portion located closer to the rear end than the first notch portion and having a second inclined surface that moves away from the lower surface as it approaches the rear end. The pressing portion includes a first protrusion that contacts the first inclined surface, and a second protrusion that is separated from the first protrusion and contacts the second inclined surface.

[0093] (2) In the cutting unit described in (1) above, the first cutout portion and the second cutout portion may be open to the first side surface and the second side surface, respectively.

[0094] (3) In the cutting unit described in (1) or (2), the first side surface may abut against a bottom surface of the groove.

[0095] (4) In the cutting unit described in any one of (1) to (3), the width of the shank in the longitudinal direction at the first cutout portion may be larger on the second side surface than on the first side surface.

[0096] (5) In the cutting unit according to any one of (1) to (4) above, the depth of the first cutout portion may be deeper on the second side surface than on the first side surface.

[0097] (6) In any one of the cutting units described in (1) to (5), the depth of the second cutout portion may be deeper on the second side surface than on the first side surface, and in a cross section of the shank perpendicular to the length direction, an inclination angle of the first inclined surface relative to an imaginary plane parallel to the lower surface may be greater than an inclination angle of the second inclined surface relative to an imaginary plane parallel to the lower surface.

[0098] (7) In the cutting unit according to any one of (1) to (6) above, the maximum value of the depth of the first cutout portion may be greater than the maximum value of the depth of the second cutout portion.

[0099] (8) In the cutting unit according to any one of (1) to (7), the first protrusion may include a first contact surface that contacts the first inclined surface, the first inclined surface is a flat surface, and the first contact surface is a convex curved surface.

[0100] (9) In the cutting unit according to any one of (1) to (7), the first protrusion may include a first contact surface that contacts the first inclined surface, the first inclined surface is a convex curved surface, and the first contact surface is a flat surface.

[0101] (10) In the cutting unit described in any one of (1) to (9) above, in a cross section of the clamp member along a longitudinal direction, a width of the first cutout portion may be greater than a width of the first protrusion portion.

[0102] (11) The cutting tool comprises: a tool holder having a quadrangular prism shape extending from the front end toward the rear end, and having a front end face located on the front end side, an upper surface extending from the front end face toward the rear end, a lower surface located on the opposite side of the upper surface, a first side surface located between the upper surface and the lower surface and extending from the front end face toward the rear end, and a second side surface located on the opposite side of the first side surface; and a cutting edge located at the front end and located on the first side surface. The upper surface has: a first notch portion having a first inclined surface that moves away from the lower surface as it approaches the rear end side, and is open to the first side surface and the second side surface; and a second notch portion located closer to the rear end than the first notch portion, and having a second inclined surface that moves away from the lower surface as it approaches the rear end side, and is open to the first side surface and the second side surface.

[0103] (12) A tool holder is a tool holder capable of mounting the cutting tool of (11), the tool holder comprising: a holder having a groove for holding a shank of the cutting tool; and a clamping member located on the holder and having a pressing portion for pressing the shank toward the inner side surface of the other side of the groove when clamped between the inner side surface of one side of the groove and the upper surface, the clamping member fixing the shank to the holder. The pressing portion comprises: a first protrusion abutting against the first inclined surface; and a second protrusion separated from the first protrusion and abutting against the second inclined surface.

[0104] (13) A method for manufacturing a machined product comprising: a step of rotating a workpiece; a step of bringing a cutting edge of a cutting unit according to any one of claims 1 to 10 into contact with the rotating workpiece; and a step of separating the cutting edge of the cutting unit from the workpiece.

[0105] The inventions of each disclosure are described above based on the accompanying drawings and embodiments. However, the invention of the present disclosure is not limited to the aforementioned embodiments. That is, the invention of the present disclosure can be variously modified within the scope shown in the present disclosure, and the embodiments obtained by appropriately combining the technical solutions respectively disclosed in different embodiments are also included in the technical scope of the invention of the present disclosure. In other words, it should be noted that it is easy for those skilled in the art to make various deformations or modifications based on the present disclosure. In addition, it should be noted that these deformations or modifications are included in the scope of the present disclosure.

[0106] Description of Reference Numerals

[0107] 10 cutting units

[0108] 12 Cutting tools

[0109] 14 knife holder

[0110] 16 handle

[0111] 16a front end

[0112] 16b backend

[0113] 16m Main body

[0114] 18 cutting blades

[0115] 20 Clamping screw

[0116] 22 front face

[0117] 24 rear end

[0118] 26 Upper surface

[0119] 28 Lower surface

[0120] 30 First side

[0121] 32 Second side

[0122] 34 knife slots

[0123] 36 screw holes

[0124] 38 first blade surface

[0125] 40 Second blade surface

[0126] 42 blade side

[0127] 44 cutting edges

[0128] 46 cage

[0129] 48 Clamping member

[0130] 50 fixing bolts

[0131] 52 slots

[0132] 52a bottom

[0133] 52b The inner side surface of one side (first inner side surface)

[0134] 52c The inner side surface of the other side (the second inner side surface)

[0135] 52g guide surface

[0136] 52s center line

[0137] 54 screw holes

[0138] 56 Mounting piece (mounting part)

[0139] 58 through holes

[0140] 60 Pressing sheet (pressing part)

[0141] 60f sliding surface

[0142] 62 Steps

[0143] 64 First incision

[0144] 64f first inclined surface

[0145] 66 Second incision

[0146] 66f Second inclined surface

[0147] 68 first protrusion

[0148] 68f first contact surface

[0149] 70 second protrusion

[0150] 70f second abutting surface.

Claims

1. A cutting unit, wherein: The cutting unit comprises: A knife handle in the shape of a quadrangular prism extending from the front end toward the rear end, and having a front end face located on the side of the front end, an upper surface extending from the front end face toward the rear end, a lower surface located on the opposite side of the upper surface, a first side surface located between the upper surface and the lower surface and extending from the front end face toward the rear end, and a second side surface located on the opposite side of the first side surface; a cutting edge located at the front end and on the first side surface; a holder having a groove for holding the tool handle; as well as a clamping member, which is located on the retaining frame and has a pressing portion for pressing the tool handle toward the inner side surface of the other side of the groove while being clamped between the inner side surface of one side of the groove and the upper surface, wherein the clamping member fixes the tool handle to the retaining frame, The upper surface has: a first cutout portion having a first inclined surface which is away from the lower surface as it approaches the rear end side; as well as a second cutout portion located closer to the rear end than the first cutout portion and having a second inclined surface which is away from the lower surface as it approaches the rear end; The pressing portion has: a first protrusion abutting against the first inclined surface; as well as The second protrusion is separated from the first protrusion and abuts against the second inclined surface.

2. The cutting unit according to claim 1, wherein: The first cutout portion and the second cutout portion are open to 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 abuts against the bottom surface of the groove.

4. The cutting unit according to any one of claims 1 to 3, wherein: The width of the shank in the length direction at the first cutout portion is larger on the second side surface than on the first side surface.

5. The cutting unit according to any one of claims 1 to 4, wherein: The depth of the first cutout portion is deeper on the second side surface than on the first side surface.

6. The cutting unit according to any one of claims 1 to 5, wherein: The depth of the second cutout portion is deeper on the second side surface than on the first side surface. In a cross section of the shank perpendicular to the longitudinal direction, an inclination angle of the first inclined surface relative to an imaginary plane parallel to the lower surface is greater than an inclination angle of the second inclined surface relative to an imaginary plane parallel to the lower surface.

7. The cutting unit according to any one of claims 1 to 6, wherein: The maximum value of the depth of the first cutout portion is greater than the maximum value of the depth of the second cutout portion.

8. The cutting unit according to any one of claims 1 to 7, wherein: The first protrusion has a first abutting surface abutting against the first inclined surface. The first inclined surface is a flat surface, and the first abutting surface is a convex curved surface.

9. The cutting unit according to any one of claims 1 to 7, wherein: The first protrusion has a first abutting surface abutting against the first inclined surface. The first inclined surface is a convex curved surface, and the first abutting surface is a flat surface.

10. The cutting unit according to any one of claims 1 to 9, wherein: In a cross section of the clamp member along a length direction, a width of the first cutout portion is greater than a width of the first protrusion.

11. A cutting tool, wherein: The cutting tool has: a knife handle in the shape of a quadrangular prism extending from a front end toward a rear end, and having a front end face located on the side of the front end, an upper surface extending from the front end face toward the rear end, a lower surface located on the opposite side of the upper surface, a first side surface located between the upper surface and the lower surface and extending from the front end face toward the rear end, and a second side surface located on the opposite side of the first side surface; and a cutting edge located at the front end and at the first side surface, The upper surface has: A first cutout portion having a first inclined surface that is away from the lower surface as it approaches the rear end and is open relative to the first side surface and the second side surface; as well as The second cutout portion is located closer to the rear end than the first cutout portion, has a second inclined surface that becomes more distant from the lower surface as it approaches the rear end, and is open to the first side surface and the second side surface.

12. A tool holder capable of mounting the cutting tool according to claim 11, wherein: The tool holder has: a holder having a groove for holding a shank of a cutting tool; as well as a clamping member, which is located on the retaining frame and has a pressing portion for pressing the tool handle toward the inner side surface of the other side of the groove while being clamped between the inner side surface of one side of the groove and the upper surface, wherein the clamping member fixes the tool handle to the retaining frame, The pressing portion has: a first protrusion abutting against the first inclined surface; as well as The second protrusion is separated from the first protrusion and abuts against the second inclined surface.

13. A method for manufacturing a machined product, wherein: The method for manufacturing the machined product comprises: The process of rotating the workpiece; A step of bringing the cutting edge of the cutting unit according to any one of claims 1 to 10 into contact with the rotating workpiece; and A step of separating the cutting edge of the cutting unit from the workpiece.

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