Cutting insert, rotary tool, and method of manufacturing a workpiece

Abstract

The present application improves the durability of the base portion, and sets a cutting condition with a high feed rate. The first end surface of the base portion has, when viewed from the front end side in the direction along the rotation axis, a first region located rearward in the rotation direction and radially outward of the second rear surface of the cutting portion, and a second region located rearward in the rotation direction and radially inward of the first region from the second front surface of the cutting portion. In a case where a virtual plane including the second rear surface is a reference surface, the first region has a first portion in which the width of the region sandwiched by the reference surface and the first rear surface of the base portion gradually increases toward the radially outward side, and the second region has a second portion in which the width of the region sandwiched by the reference surface and the first rear surface gradually increases toward the radially inward side.

Description

Technical Field

[0001] This disclosure relates to a cutting insert, a rotary tool, and a method for manufacturing a workpiece for milling. Background Technology

[0002] Rotary cutting tools used in milling workpieces made of metal or the like are known, for example, those described in Patent Documents 1 to 3. The rotary cutting tools described in Patent Documents 1 to 3 each have a tool holder and a cutting insert held in the tool holder. The cutting insert in the rotary cutting tool described in Patent Document 3 has a base portion called a cartridge in Patent Document 3, and a cutting portion called a cutting edge in Patent Document 3.

[0003] Prior art literature

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2004-284010

[0006] Patent Document 2: Japanese Patent Application Publication No. 2008-023632

[0007] Patent Document 3: Japanese Patent Application Publication No. 2002-011612 Summary of the Invention

[0008] The cutting insert disclosed herein is used in a rotary tool capable of rotating about a rotation axis, wherein the cutting insert has a base portion and a cutting portion. The base portion has: a first rear surface located rearward in the rotation direction of the rotary tool; a first front surface located radially outward and facing forward in the rotation direction; and a first end face located on a front end side along the rotation axis and connected to the first rear surface and the first front surface. The cutting portion has: a flat second rear surface engaging the first front surface; a flat second front surface located opposite the second rear surface; a second end face located on the front end side and connected to the second rear surface and the second front surface; and a cutting edge located at the intersection of the second front surface and the second end face. The first end face, viewed from the front end side, has: a first region located rearward and radially outward relative to the second rear surface in the rotation direction; and a second region located rearward and radially inward relative to the second front surface in the rotation direction than the first region. When the imaginary plane including the second rear surface is used as a reference plane, the first region has a first portion in which the width of the region sandwiched between the reference plane and the first rear surface gradually increases radially outward. The second region has a second portion in which the width of the region sandwiched between the reference plane and the first rear surface gradually increases radially inward. Attached Figure Description

[0009] Figure 1 This is a schematic perspective view of a rotary cutting tool according to an embodiment of the present disclosure.

[0010] Figure 2 Viewed from the front end Figure 1 A schematic diagram of a rotary cutting tool.

[0011] Figure 3 yes Figure 1 A schematic side view of the rotary cutting tool shown.

[0012] Figure 4 yes Figure 2 An enlarged view of section IV in the image.

[0013] Figure 5 This is a schematic perspective view of a cutting blade according to an embodiment of the present disclosure.

[0014] Figure 6 yes Figure 5 A schematic top view of the cutting blade shown.

[0015] Figure 7 yes Figure 5 A schematic top view of the cutting blade shown.

[0016] Figure 8 yes Figure 5 A schematic top view of the cutting blade shown.

[0017] Figure 9 yes Figure 8 A schematic enlarged view of a portion of the cutting blade shown.

[0018] Figure 10 This is a schematic diagram illustrating a method for manufacturing a machined workpiece according to an embodiment of the present disclosure.

[0019] Figure 11 This is a schematic diagram illustrating a method for manufacturing a machined workpiece according to an embodiment of the present disclosure.

[0020] Figure 12 This is a schematic diagram illustrating a method for manufacturing a machined workpiece according to an embodiment of the present disclosure. Detailed Implementation

[0021] Hereinafter, a method for manufacturing cutting inserts, cutting tools, and machined parts according to embodiments of the present disclosure will be described in detail using the accompanying drawings. However, for ease of explanation, the figures referred to below only show simplified components necessary for describing the embodiments. Therefore, the cutting inserts and rotary tools of the embodiments of the present disclosure can have any components not shown in the figures. In addition, the dimensions of the components in the figures do not faithfully represent the actual dimensions of the components or the dimensional ratios of each component.

[0022] In this disclosure, the term "rotation axis" refers to the rotation axis (rotation center) of the rotating tool. "Radial outer side" refers to the direction or side away from the rotation axis in the radial direction, synonymous with "outer circumference side." "Radial inner side" refers to the direction or side close to the rotation axis in the radial direction. "Radial" means a direction orthogonal to the rotation axis. "Orthogonal" is not limited to strict orthogonality, but rather allows for an error of approximately ±5 degrees. "Parallel" is not limited to strict parallelism, but rather allows for an error of approximately ±5 degrees. Furthermore, in this disclosure, for convenience, the positional relationships of the various parts of the cutting insert are defined based on the state in which the cutting insert is held (fixed) in the tool holder's groove.

[0023] <Rotary cutting tool>

[0024] Reference Figures 1 to 4 The rotary cutting tool 10 of the present disclosure will be described. Figure 1 This is a schematic perspective view of the rotary cutter 10 according to an embodiment of the present disclosure. Figure 2 Viewed from the front end Figure 1 A schematic diagram of the rotary cutter 10 shown. Figure 3 yes Figure 1A schematic side view of the rotary cutting tool shown. Figure 4 yes Figure 2 An enlarged view of section IV in the image.

[0025] like Figures 1 to 3 As shown in the example, the rotary tool 10 of the embodiments of this disclosure is used for the workpiece W (see reference). Figure 10 A rotating tool 10 is used for milling operations and is capable of rotating about a rotation axis S. The rotating tool 10 may also have a tool holder 12 mounted on the spindle of a milling machine or similar machine, and multiple cutting inserts 14 held in the tool holder 12. The tool holder 12 and the cutting inserts 14 are used for the rotating tool 10.

[0026] The tool holder 12 can also be a cylindrical shape extending along the rotation axis S from the front end 12a to the rear end 12b. Materials for the tool holder 12 include, for example, stainless steel, carbon steel, cast iron, aluminum alloy, and other metals. Multiple cutting grooves 16 can also be provided circumferentially at intervals on the outer circumferential surface of the tool holder 12. These multiple cutting grooves 16 can be arranged at equal intervals or unequal intervals. The multiple cutting grooves 16 can also be located on the front end 12a side of the tool holder 12. The number of cutting grooves 16 can also be one.

[0027] like Figures 3 to 4 As shown in the example, the front end PDa side of the tool groove 16 in the direction PD parallel to the rotation axis S can also be open. The radially outer side RDe of the tool groove 16 can also be open. The tool groove 16 can also have a bottom surface 16a located on the radially inner side RDi, and a first inner side surface 16b and a second inner side surface 16c rising from both sides of the bottom surface 16a toward the radially outer side RDo. The first inner side surface 16b of each tool groove 16 can also be located in front of the rotation direction T, in other words, on the side of the rotation direction T. The second inner side surface 16c of each tool groove 16 can also be located behind the rotation direction T, in other words, on the opposite side of the rotation direction T. The second inner side surface 16c of each tool groove 16 can also be a curved shape (convex shape) protruding forward toward the rotation direction T. In other words, the second inner side surface 16c of each tool groove 16 can also have a protrusion 16d protruding in the forward direction of the rotation direction T.

[0028] like Figures 1 to 3 As shown in the example, the cutting insert 14 can also be located in each of the tool slots 16 of the tool holder 12. The cutting insert 14 can also be located in one or more selected tool slots 16 of the tool holder 12. Alternatively, the cutting insert 14 can be fixed to the tool slot 16 of the tool holder 12 by a retaining screw 18. The cutting insert 14 can also be fixed to the tool slot 16 of the tool holder 12 by a clamping member.

[0029] The rotary cutting tool 10 may also have an adjustment mechanism 20 for adjusting the position of the cutting insert 14 relative to the tool holder 12's groove 16. The adjustment mechanism 20 may also be located in the tool holder 12's groove 16 adjacent to the cutting insert 14. The adjustment mechanism 20 may also be fixed to the tool holder 12's groove 16 by a fixing screw 22.

[0030] <Cutting inserts>

[0031] Reference Figures 5 to 8 The structure of the cutting blade 14 according to the embodiments of the present disclosure will be described. Figure 5 This is a schematic perspective view of the cutting blade 14 according to an embodiment of the present disclosure. Figures 6 to 8 They are Figure 5 A schematic top view of the cutting blade 14 shown. Figure 6 This is a top view (side view) observed from the radially outer RDe direction toward the rotation axis S. Figure 7 Viewed from the front in the direction of rotation T Figure 5 The top view of the cutting blade 14 shown. Figure 8 It is viewed from the front side along the rotation axis S. Figure 5 Top view (front view) of the cutting insert 14 shown.

[0032] like Figures 5 to 8 As shown in the example, the cutting insert 14 of the embodiments of this disclosure may also have a base portion 24 for mounting to the tool groove 16 of the tool holder 12. The base portion 24 may also have a recess that opens toward the radially outward RDe and toward the front end PDa side in the direction PD parallel to the rotation axis S. The base portion 24 may also have a main wall portion 24a that can abut against the bottom surface 16a of the tool groove 16 of the tool holder 12.

[0033] The base portion 24 may also have a first outer wall portion 24b opposite to the first inner surface 16b of the groove 16 of the tool holder 12. The first outer wall portion 24b of the base portion 24 may also extend radially outward from the main wall portion 24a toward RDe. The base portion 24 may also have a second outer wall portion 24c capable of abutting against the second inner surface 16c of the groove 16 of the tool holder 12. The second outer wall portion 24c of the base portion 24 may also extend radially outward from the main wall portion 24a. The second outer wall portion 24c of the base portion 24 may also be located behind the first outer wall portion 24b in the rotation direction T. In addition, the base portion 24 may also have an upright wall portion 24d on the rear end PDb side in the direction parallel to the rotation axis S, rising from the second outer wall portion 24c toward the first outer wall portion 24b.

[0034] The main wall portion 24a, the first outer wall portion 24b, the second outer wall portion 24c, and the upright wall 24d are structural parts of the outer edge surface of the base portion 24, and each has a wall thickness.

[0035] The base portion 24 may also have a through hole 26 for the fixing screw 22 to pass through. The through hole 26 may also be open relative to the radially inner side RDi and the radially outer side RDe. The opening of the radially inner side RDi in the through hole 26 may also be located on the wall surface of the main wall portion 24a. In addition, the first outer wall portion 24b of the base portion 24 may also have a notch 28 for avoiding interference with the fixing screw 22.

[0036] like Figure 8 As shown in the example, the base portion 24 may also have a first rear surface 30 located behind in the rotation direction T, and most of the first rear surface 30 may be formed by the outer surface of the second outer wall portion 24c of the base portion 24. The first rear surface 30 of the base portion 24 may also extend from the front end PDa side to the rear end PDb side in the direction PD parallel to the rotation axis S. The direction PD parallel to the rotation axis S is an example of a direction along the rotation axis S.

[0037] The base portion 24 may also have a recess 32 that opens towards the front and radially outward RDe in the rotation direction T. The recess 32 may also be located on the front end PDa side of PD in the direction parallel to the rotation axis S, and on the radially outward RDe of the base portion 24. The bottom surface of the recess 32 may also be a first front surface 34A facing forward in the rotation direction T. In other words, the base portion 24 may also have a first front surface 34A facing forward in the rotation direction T. The first front surface 34A of the base portion 24 may also be located on the front end PDa side of PD in the direction parallel to the rotation axis S, and on the radially outward RDe of the base portion 24.

[0038] The base portion 24 may also have a first end face 36 located on the front end PDa side of the direction PD parallel to the rotation axis S. The first end face 36 may also be formed by the end faces of the main wall portion 24a, the first outer wall portion 24b, and the second outer wall portion 24c on the front end PDa side of the direction PD parallel to the rotation axis S. The first end face 36 of the base portion 24 may also be connected to the first rear surface 30 and the first front surface 34A.

[0039] For example, stainless steel, carbon steel, or tool steel can be used as the material for the base part 24.

[0040] The cutting insert 14 may also have a cutting portion 38 that contacts the workpiece W for cutting. The cutting portion 38 may, for example, be joined to the first front surface 34A of the bottom surface of the recess 32, which serves as the base portion 24, by a bonding material such as brazing filler metal. Alternatively, the recess 32 may have a transverse wall surface 34B located radially inward relative to the first front surface 34A, RDi, and the cutting portion 38 may be joined to the transverse wall surface 34B in addition to the first front surface 34A. Alternatively, the recess 32 may have a rear wall surface 34C located on the rear end PDb side of the direction PD parallel to the rotation axis S, relative to the first front surface 34A, PD, and PDb, and the cutting portion 38 may be joined to the rear wall surface 34C in addition to the first front surface 34A and the transverse wall surface 34B. The cutting portion 38 may also be a generally polygonal shape, such as a generally triangular plate shape.

[0041] like Figures 5 to 8 As shown in the example, the cutting portion 38 may also have a flat second rear surface 40 that engages with the first front surface 34A of the base portion 24. The second rear surface 40 of the cutting portion 38 may also face rearward in the rotational direction T. In other words, the second rear surface 40 of the cutting portion 38 may also be located rearward in the rotational direction T of the cutting portion 38. Alternatively, the cutting portion 38 may also have a flat second front surface 42 located on the opposite side of the second rear surface 40. The second front surface 42 of the cutting portion 38 may also face forward in the rotational direction T. In other words, the second front surface 42 of the cutting portion 38 may also be located forward in the rotational direction T of the cutting portion 38.

[0042] The cutting portion 38 may also have a second end face 44 located on the front end PDa side of the direction PD parallel to the rotation axis S. The second end face 44 of the cutting portion 38 may also be connected to the second rear surface 40 and the second front surface 42. Alternatively, the cutting portion 38 may also have an outer surface 46 located radially outward RDe. The outer surface 46 of the cutting portion 38 may also be connected to the second rear surface 40 and the second front surface 42.

[0043] The cutting portion 38 may also have a bottom cutting edge 48 serving as a first cutting edge located at the intersection of the second front surface 42 and the second end surface 44. The cutting portion 38 may also have an outer peripheral cutting edge 50 serving as a second cutting edge located at the intersection of the second front surface 42 and the outer side surface 46. The bottom cutting edge 48 and the outer peripheral cutting edge 50 may also be connected via a corner portion 52. The corner portion 52 of the cutting portion 38 may also function as a corner cutting edge.

[0044] Examples of materials that can be used for the cutting part 38 include hard materials such as cBN (Cubic Boron Nitride) and PCD (PolyCrystalline Diamond). A coating can also be applied to the surface of the cutting part 38 using chemical vapor deposition (CVD) or physical vapor deposition (PVD). Examples of materials that can be used for the coating include titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), or aluminum oxide (Al2O3).

[0045] like Figures 5 to 8 As shown in the example, a chip groove 54 for discharging chips may also be provided in the base portion 24. The recess 32 may also be located within the chip groove 54. The chip groove 54 may also be located in front of the cutting portion 38 in the rotational direction T. Furthermore, a spray hole 56 for spraying coolant (cooling medium) towards the cutting portion 38 may also be provided in the base portion 24. The number of spray holes 56 may be one or more. The spray holes 56 may also be connected to a coolant supply source via a coolant passage provided inside the tool holder 12.

[0046] Reference Figure 6 , Figure 8 and Figure 9 Other structures of the cutting blade 14 according to the embodiments of this disclosure will be described. Figure 9 yes Figure 8 A schematic enlarged view of a portion of the cutting blade 14 shown.

[0047] like Figure 8 and Figure 9 As shown in the example, the first end face 36 of the base portion 24 can also have a first region F1. From the rotation axis S (refer to...) Figure 1 When viewed from the front end PDa side of the direction parallel to PD, the first region F1 includes a portion located rearward in the rotational direction T relative to the second rear surface 40 of the cutting portion 38, and may also be located radially outward RDe of the base portion 24. When viewed from the front end PDa side of PD in the direction parallel to the rotational axis S, the first end face 36 of the base portion 24 may also have a second region F2 located rearward in the rotational direction T relative to the second front surface 42 of the cutting portion 38, and located radially inward RDi than the first region F1. Figure 9 In the example shown, different points are marked on the first region F1 and the second region F2 of the first end face 36 of the base part 24.

[0048] When the imaginary plane including the second rear surface 40 of the cutting portion 38 is used as the reference plane VP, the first region F1 of the first end face 36 of the base portion 24 may also have a first portion F1p whose width gradually increases radially outward RDe in the region behind the second rear surface 40 of the cutting portion 38 and sandwiched between the reference plane VP and the first rear surface 30. The second region F2 of the first end face 36 of the base portion 24 may also have a second portion F2p whose width gradually increases radially inward RDi in the region sandwiched between the reference plane VP and the first rear surface 30. The width of the region sandwiched between the reference plane VP and the first rear surface 30 is the width in a direction orthogonal to the reference plane VP.

[0049] The first region F1 may also have a portion other than the first part F1p. For example, in addition to the first part F1p, which gradually increases in width toward the radially outward RDe, the first region F1 may also have a portion with a constant width. The portion with a constant width may be located radially inward RDi relative to the first part F1p, or it may be located radially outward RDe.

[0050] The second region F2 can also have portions other than the second part F2p. For example, in addition to the second part F2p, which gradually increases in width towards the radially outward RDe, the second region F2 can also have a portion of constant width. This portion of constant width can be located radially inward RDi relative to the second part F2p, or it can be located radially outward RDe. For example, as... Figure 9 As shown, when the portion with a constant width is located radially inward relative to the second portion F2p, the wall thickness of the portion supporting the cutting insert 14 in the tool holder 12 can be easily ensured.

[0051] The maximum value L1max of the width of the region F1 in the first region F1 of the first end face 36 of the base portion 24, which is sandwiched between the reference surface VP and the first rear surface 30, can also be less than the maximum value L2max of the width of the region F2 in the second region F2, which is sandwiched between the reference surface VP and the first rear surface 30. Furthermore, the minimum value L1min of the width of the region F1 in the first region F1 of the first end face 36 of the base portion 24, which is sandwiched between the reference surface VP and the first rear surface 30, can also be greater than the minimum value L2min of the width of the region F2 in the second region F2, which is sandwiched between the reference surface VP and the first rear surface 30.

[0052] like Figure 6 , Figure 8 and Figure 9As shown in the example, the first end face 36 of the base portion 24 may also have a groove 58 extending in the direction along the rotation axis S. The groove 58 of the base portion 24 may also extend in a direction PD parallel to the rotation axis S. The groove 58 of the base portion 24 may also be a curved shape (concave shape) recessed towards the front in the rotation direction T. In other words, the first end face 36 of the base portion 24 may also have a groove 58 as a recessed portion towards the front in the rotation direction T. The groove 58 of the base portion 24 may also engage with the protrusion 16d of the tool groove 16 of the tool holder 12.

[0053] The groove 58 of the base portion 24 may also have a bottom 58b located at the foremost point in the rotational direction T. The bottom 58b of the groove 58 of the base portion 24 may also be located radially inwardly to the cutting portion 38 at a position RDi. The edge 58e of the radially outer RDi of the groove 58 of the base portion 24 may also coincide with the edge 30e of the radially outer RDi of the first rear surface 30. The groove 58 of the base portion 24 may also be located away from the edge 30i of the radially inner RDi of the first rear surface 30.

[0054] like Figure 9 As shown in the example, when the first region F1 of the first end face 36 of the base portion 24 has a first portion F1p, the thickness of the radially outer side RDe (outer peripheral side) of the base portion 24 can be sufficiently ensured. Therefore, even if a large cutting load is applied to the outer peripheral side of the base portion 24, the base portion 24 is difficult to break. As a result, the durability of the base portion 24 can be improved, and high-speed cutting conditions can be set.

[0055] like Figure 8 and Figure 9 As shown in the example, when the first region F1 of the first end face 36 of the base portion 24 has a first portion F1p, the durability of the base portion 24 relative to the cutting load is improved. Furthermore, when the second region F2 of the first end face 36 of the base portion 24 has a second portion F2p, even at high speeds, the scattering of the cutting insert 14 caused by centrifugal force is reduced by having the second portion F2p. Moreover, when the base portion 24 has both these first portions F1p and second portions F2p, the first rear surface 30 of the base portion 24 is a concave shape recessed towards the front in the rotational direction T. Thus, while ensuring the durability of the portion of the tool holder 12 located rearward relative to the cutting insert 14 in the rotational direction and the base portion 24, the number of tool grooves 16 on which the cutting insert 14 is mounted can be increased. Therefore, more efficient machining is possible.

[0056] In addition, since the first rear surface 30 of the base portion 24 is a concave shape that is recessed in front of the rotation direction T, the cutting insert 14 is less likely to shift position relative to the tool holder 12, thereby improving the machining accuracy of the cutting insert 14.

[0057] As described above, the first region F1 is the portion of the first end face 36 located rearward relative to the second rear surface 40 in the rotational direction T, and the second region F2 is the portion of the first end face 36 adjacent to the first region F1 on the radially inner side RDi. Specifically, in Figure 9 In the example shown, the first region F1, with the bottom 58b of the groove 58 as a reference, is the portion of the first end face 36 located radially outward of the bottom 58b, RDe, and the second region F2 is the portion of the first end face 36 located radially inward of the bottom 58b, RDi. In other words, the bottom 58b of the groove 58 is disposed at the boundary between the first region F1 and the second region F2.

[0058] like Figure 8 and Figure 9 As shown in the example, the maximum value L1max of the width of the first portion F1p in the first region F1 of the first end face 36 of the base portion 24 is set to be less than the maximum value L2max of the width of the second portion F2p in the second region F2. In this case, the thickness of the portion supporting the cutting insert 14 in the tool holder 12 can be sufficiently ensured on the outer peripheral side (radial outer RDe). As a result, the tool holder 12 is less prone to breakage, and the durability of the tool holder 12 can be further improved.

[0059] like Figure 8 and Figure 9 As shown in the example, the minimum value L1min of the width of the first portion F1p in the first region F1 of the first end face 36 of the base portion 24 is set to be less than the minimum value L2min of the width of the second portion F2p in the second region F2. In this case, the thickness of the portion supporting the cutting portion 38 in the base portion 24 can be sufficiently ensured on the outer periphery. The thickness of the outer periphery of the tool holder 12 can be sufficiently ensured. As a result, the tool holder 12 is less prone to breakage, and the durability of the tool holder 12 can be further improved.

[0060] like Figure 6 , Figure 8 and Figure 9 As shown in the example, when the groove 58 of the base portion 24 is a curved shape (concave shape) that is recessed in the direction of rotation T, the cutting load is less likely to be concentrated at specific locations on the first rear surface 30 of the base portion 24 and the seat surface of the tool holder 12, i.e., the first inner surface 16b. As a result, the cutting insert 14 and the tool holder 12 are less likely to break, and their durability can be further improved.

[0061] like Figure 8 and Figure 9As shown in the example, when the bottom 58b of the groove 58 in the base portion 24 is located radially inward to the cutting portion 38 (RDi), it is difficult to apply a cutting load to the thinner portion of the base portion 24, i.e., the portion corresponding to the bottom 58b. Therefore, the cutting insert 14 is less prone to breakage, further improving its durability.

[0062] like Figure 6 , Figure 8 and Figure 9 As shown in the example, when the groove 58 of the base portion 24 extends in the direction PD parallel to the rotation axis S, the cutting insert 14 is less likely to shift position relative to the tool holder 12, which can further improve the machining accuracy of the cutting insert 14.

[0063] like Figure 8 and Figure 9 As shown in the example, when the edge 58e of the radially outer RDe of the groove 58 in the base portion 24 coincides with the edge 30e of the radially outer RDe of the first rear surface 30, the thickness of the base portion can be sufficiently ensured on the outer peripheral side (radially outer RDe). As a result, the cutting insert 14 is less prone to breakage, and the durability of the cutting insert 14 can be further improved.

[0064] like Figure 8 and Figure 9 As shown in the example, when the groove 58 of the base portion 24 is far from the edge 30i of the radially inner side RDi of the first rear surface 30, it is possible to avoid excessive thinning of the portion of the tool holder 12 that supports the cutting insert 14 at the radially inner side RDi. As a result, the tool holder 12 is less prone to breakage, and the durability of the tool holder 12 can be further improved.

[0065] like Figure 8 and Figure 9 As shown in the example, the width W2 of the second radial portion F2p can also be greater than the width W1 of the first radial portion F1p. In this case, it is easy to ensure a larger maximum value L2max of the width of the second portion F2p while making the inclination of the second portion F2p relative to the reference plane VP gentle. By making the inclination of the second portion F2p relative to the reference plane VP gentle, the cutting load transmitted from the cutting insert 14 to the tool holder 12 is less likely to be directed radially outward RDe, and the cutting insert 14 is held stably. In addition, by ensuring a larger maximum value L2max of the width of the second portion F2p, it is less likely that the cutting insert 14 will fly away due to centrifugal force.

[0066] <Manufacturing Method of Machining Parts>

[0067] Reference Figures 10 to 12 The method for manufacturing the workpiece according to the embodiments will be described. Figures 10 to 12This is a schematic diagram illustrating the manufacturing method of the machined workpiece according to the embodiment.

[0068] like Figures 10 to 12 As illustrated in the example, the method for manufacturing a workpiece according to the embodiments of this disclosure is a method for manufacturing a workpiece M as a cut-work piece W after cutting, comprising a first step, a second step, and a third step. The first step is a step of rotating the rotary tool 10. The second step is a step of bringing the rotating rotary tool 10 into contact with the workpiece W. The third step is a step of moving the rotary tool 10 away from the workpiece W. Examples of materials for the workpiece W include aluminum alloy, stainless steel, carbon steel, alloy steel, cast iron, or non-ferrous metals. The specific details of the method for manufacturing a workpiece according to this embodiment are described below.

[0069] like Figure 10 and Figure 11 As shown in the example, while rotating the rotary tool 10 in the rotational direction T, it moves towards the workpiece W in the direction of arrow FD. Furthermore, while bringing the cutting insert 14 of the rotating rotary tool 10 into contact with the workpiece W, it moves in the direction of arrow FD. Thus, the rotary tool 10 performs milling operations on the workpiece W, as shown. Figure 12 As shown in the example, the machining surface Wf is formed on the workpiece being cut.

[0070] Then, as Figure 12 As shown in the example, the rotary tool 10 is moved in the direction of arrow FD, away from the workpiece W. Thus, the cutting of the workpiece W is completed, and a finished workpiece M of the workpiece W can be manufactured. Due to the aforementioned reasons, the rotary tool 10 possesses excellent cutting capabilities, and therefore can manufacture a finished workpiece M with excellent machining accuracy.

[0071] In continuous cutting operations, the cutting insert 14 of the rotary tool 10 is repeatedly brought into contact with different parts of the workpiece W while the rotary tool 10 is rotating. In this embodiment, the rotary tool 10 is brought close to the workpiece W, but it is sufficient for the rotary tool 10 to be relatively close to the workpiece W; therefore, the workpiece W can also be brought close to the rotary tool 10. This is also done when the rotary tool 10 is moved away from the workpiece W.

[0072] The invention disclosed herein has been described above based on the accompanying drawings and embodiments. However, the invention disclosed herein is not limited to the foregoing embodiments. That is, various modifications can be made to the invention within the scope shown in this disclosure, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included within the technical scope of this invention. It should be noted that those skilled in the art can easily make various modifications or alterations based on this disclosure. Furthermore, it should be understood that these modifications or alterations are included within the scope of this disclosure.

[0073] Explanation of reference numerals in the attached figures:

[0074] 10 Rotary cutting tools

[0075] 12. Knife handle

[0076] 14 Cutting inserts

[0077] 16-way groove

[0078] 16a Bottom surface

[0079] 16b First inner surface

[0080] 16c Second inner surface

[0081] 16d convex part

[0082] 18 Fixing screws

[0083] 20 Adjustment mechanism

[0084] 22 Fixing screws

[0085] 24 base part

[0086] 24a Main wall section

[0087] 24b First outer wall portion

[0088] 24c Second outer wall portion

[0089] 24d Erect wall section

[0090] 26 Through holes

[0091] 28. Notch

[0092] 30 First rear surface

[0093] 30e Radial outer edge

[0094] 30i Radial inner edge

[0095] 32 recess

[0096] 34A First Front Surface

[0097] 34B transverse wall surface

[0098] 34C Rear Wall

[0099] 36 First end face

[0100] 38 Cutting section

[0101] 40 Second rear surface

[0102] 42 Second front surface

[0103] 44 Second end face

[0104] 46. ​​Outer surface

[0105] 48. Bottom cutting edge (cutting edge)

[0106] 50 Peripheral cutting edge (outer peripheral cutting edge)

[0107] 52. Corner

[0108] 54 Chip Groove

[0109] 56 Injection holes

[0110] 58 slots

[0111] 58b bottom

[0112] 58e Radial outer edge

[0113] F1 Zone 1

[0114] F1p Part 1

[0115] F2 Second Area

[0116] F2p Part 2.

Claims

1. A cutting insert for a rotary tool capable of rotating about a rotation axis, wherein, The cutting blade has a base portion and a cutting portion. The base portion has: The first rear surface is located behind the rotating tool in the direction of rotation. A first front surface, which is located radially outward and faces forward in the direction of rotation; as well as The first end face is located on the front end side along the direction of the rotation axis and is connected to the first rear surface and the first front surface. The cutting part has: A flat second rear surface that engages with the first front surface; A flat second front surface, located on the opposite side of the second rear surface; The second end face is located on one side of the front end and is connected to the second rear surface and the second front surface; as well as The cutting edge is located at the intersection of the second front surface and the second end face. The first end face, when viewed from the front end side, has: A first region, which is located rearward and radially outward relative to the second rear surface in the direction of rotation; and The second region is located behind the second front surface in the direction of rotation and radially inward than the first region. When using an imaginary plane including the second rear surface as a reference plane, The first region has a first portion whose width gradually increases radially outward from the region sandwiched between the reference plane and the first rear surface. The second region has a second portion whose width gradually increases radially inward from the region sandwiched between the reference plane and the first rear surface. The maximum width of the region in the first region that is sandwiched between the reference surface and the first rear surface is less than the maximum width of the region in the second region that is sandwiched between the reference surface and the first rear surface.

2. The cutting insert according to claim 1, wherein, The minimum width of the region in the first region that is sandwiched between the reference surface and the first rear surface is greater than the minimum width of the region in the second region that is sandwiched between the reference surface and the first rear surface.

3. A cutting insert for a rotary tool capable of rotating about a rotation axis, wherein, The cutting blade has a base portion and a cutting portion. The base portion has: The first rear surface is located behind the rotating tool in the direction of rotation. A first front surface, which is located radially outward and faces forward in the direction of rotation; as well as The first end face is located on the front end side along the direction of the rotation axis and is connected to the first rear surface and the first front surface. The cutting part has: A flat second rear surface that engages with the first front surface; A flat second front surface, located on the opposite side of the second rear surface; The second end face is located on one side of the front end and is connected to the second rear surface and the second front surface; as well as The cutting edge is located at the intersection of the second front surface and the second end face. The first end face, when viewed from the front end side, has: A first region, which is located rearward and radially outward relative to the second rear surface in the direction of rotation; and The second region is located behind the second front surface in the direction of rotation and radially inward than the first region. When using an imaginary plane including the second rear surface as a reference plane, The first region has a first portion whose width gradually increases radially outward from the region sandwiched between the reference plane and the first rear surface. The second region has a second portion whose width gradually increases radially inward from the region sandwiched between the reference plane and the first rear surface. The minimum width of the region in the first region that is sandwiched between the reference surface and the first rear surface is greater than the minimum width of the region in the second region that is sandwiched between the reference surface and the first rear surface.

4. The cutting insert according to claim 1 or 3, wherein, The first rear surface has a groove extending in the direction along the rotation axis. The groove is a curved shape that is concave in front of the direction of rotation.

5. The cutting insert according to claim 4, wherein, The groove has a bottom that is located at the foremost point in the direction of rotation. The bottom is located radially inward from the cutting portion.

6. The cutting insert according to claim 4, wherein, The groove extends in a direction parallel to the axis of rotation.

7. The cutting insert according to claim 4, wherein, The radially outer edge of the groove coincides with the radially outer edge of the first rear surface.

8. The cutting insert according to claim 4, wherein, The groove is located on the radially inner edge away from the first rear surface.

9. A rotary cutting tool, wherein, The rotary cutting tool has: A tool holder for a rotary cutting tool capable of rotating about a rotation axis is cylindrical in shape, extending along the rotation axis from a front end to a rear end, and has a cutting groove located on one side of the front end; and The cutting insert according to any one of claims 1 to 8, which is located within the tool groove.

10. A method for manufacturing a workpiece that has been machined by cutting, wherein, The method for manufacturing the workpiece includes: The process of rotating the rotary tool as described in claim 9; The process of bringing the rotating cutting tool into contact with the workpiece; and The process of moving the rotating tool away from the workpiece being cut.

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