Cutting tool and method for manufacturing a cutting tool and a workpiece

Abstract

Cutting tools that achieve high durability and stable placement of cutting inserts are described. In these cutting tools, the cutting insert has a through hole that opens from a first face to a second face, and a groove has a threaded hole with a first groove opening. A screw is inserted into the through hole and threaded into the threaded hole.

Description

Technical Field

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

[0002] Examples of cutting tools used in machining workpieces include those described in Patent Documents 1 and 2.

[0003] The cutting tools described in Patent Documents 1 and 2 both have a tool holder (body) and a cutting insert (tool clip). The cutting insert has a cutting edge and a through hole, and is fixed to the tool holder by a screw (bolt) inserted into the through hole. The tool holder has a groove for fixing the cutting insert, and the groove has a seat surface with a threaded hole for fixing the screw.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Publication No. 2000-042820

[0007] Patent Document 2: Japanese Patent Publication No. 2017-535439 Summary of the Invention

[0008] A cutting tool according to one aspect of this disclosure comprises: a tool holder extending from a front end toward a rear end and having a groove on the front end side; a cutting insert located in the groove; and a screw securing the cutting insert to the tool holder. The cutting insert has: a first face; a second face located opposite to the first face; a first side face located between the first face and the second face and connected to the first face; a cutting edge located at the intersection of the first face and the first side face; and a through hole opening from the first face side to the second face side. The groove has: a first constraint face and a second constraint face abutting against the second face; a first groove extending between the first constraint face and the second constraint face; and a threaded hole opening in the first groove. The screw is inserted into the through hole and threadedly fastened to the threaded hole. Attached Figure Description

[0009] Figure 1 This is a first perspective view showing the outline structure of the cutting tool according to Embodiment 1 of the present disclosure.

[0010] Figure 2 This is a second perspective view showing the outline structure of the cutting tool according to Embodiment 1 of this disclosure.

[0011] Figure 3This is a side view showing the outline structure of the cutting tool according to Embodiment 1 of this disclosure.

[0012] Figure 4 yes Figure 3 Enlarged view of range IV.

[0013] Figure 5 This is a bottom view showing the outline structure of the cutting tool according to Embodiment 1 of this disclosure.

[0014] Figure 6 This illustrates the outline structure of the cutting tool according to Embodiment 1 of this disclosure. Figure 3 Sectional view VI-VI.

[0015] Figure 7 yes Figure 6 An enlarged view of range VII.

[0016] Figure 8 This is a first perspective view showing the outline structure of the knife handle.

[0017] Figure 9 This is a second perspective view showing the outline structure of the knife handle.

[0018] Figure 10 This is a side view showing the outline structure of the tool holder.

[0019] Figure 11 yes Figure 10 An enlarged view of the range XI.

[0020] Figure 12 This is a bottom view showing the outline of the tool holder.

[0021] Figure 13 It shows the outline structure of the tool holder. Figure 10 Sectional view XIII-XIII.

[0022] Figure 14 yes Figure 13 A magnified view of the range XIV.

[0023] Figure 15 This is a perspective view showing the outline structure of the cutting blade.

[0024] Figure 16 From Figure 15 The top view obtained by observing the cutting blade in the XVI direction.

[0025] Figure 17 From Figure 15 The top view obtained by observing the cutting blade in the XVII direction.

[0026] Figure 18 From Figure 15The top view obtained by observing the cutting blade in the XVIII direction.

[0027] Figure 19 From Figure 15 The top view obtained by observing the cutting blade in the XIX direction.

[0028] Figure 20 From Figure 15 The top view obtained by observing the cutting blade from the XX direction.

[0029] Figure 21 This is a perspective view showing the first step in the manufacturing method of the machined object according to Embodiment 2 of this disclosure.

[0030] Figure 22 This is a perspective view showing the second step in the manufacturing method of the machined object according to Embodiment 2 of this disclosure.

[0031] Figure 23 This is a perspective view showing the third step in the manufacturing method of the machined object according to Embodiment 2 of this disclosure. Detailed Implementation

[0032] When securing the cutting insert to the tool holder, the insert is pressed into the holder using screws. Within the tool holder surface, the area near the threaded hole is more susceptible to applying greater force compared to areas further away from the threaded hole.

[0033] When the cutting edge of the cutting insert is located near the threaded hole, although the insertion stability is high, the durability is reduced due to the narrow gap between the cutting edge and the through hole. When the cutting edge of the cutting insert is located far from the threaded hole, although the cutting insert has high durability, its insertion stability is reduced.

[0034] Based on the above reasons, we seek cutting tools that balance the high durability of the cutting inserts with the stability of their placement.

[0035] The cutting tool of the present invention has high durability of cutting inserts and stable placement.

[0036] Specific embodiments of this disclosure will be described. For ease of explanation, sometimes the same reference numerals are used to refer to components that have the same function as those previously described, without repeating their description.

[0037] For ease of explanation, the figures referred to below are simplified representations of the main components necessary for illustrating each embodiment. Therefore, for example, the cutting tool 101 may include arbitrary structural components not shown in the referenced figures. The dimensions of the components in the figures do not strictly represent the actual dimensions and aspect ratios of the structural components. The above points apply to the manufacturing methods of all cutting tools 101 and workpieces 301.

[0038] [Implementation Method 1]

[0039] Figure 1 This is a first perspective view showing the outline structure of the cutting tool 101 according to Embodiment 1 of the present disclosure. Figure 2 This is a second perspective view showing the outline structure of the cutting tool 101 according to Embodiment 1 of this disclosure. Figure 3 This is a side view showing the outline structure of the cutting tool 101 according to Embodiment 1 of this disclosure. Figure 4 yes Figure 3 Enlarged view of range IV. Figure 5 This is a bottom view showing the outline structure of the cutting tool 101 according to Embodiment 1 of this disclosure. Figure 6 This shows a schematic structure of the cutting tool 101 according to Embodiment 1 of the present disclosure. Figure 3 Sectional view VI-VI. Figure 7 yes Figure 6 An enlarged view of range VII. The cutting tool 101 may have a tool holder 1, a cutting insert 2, and a screw 3.

[0040] Figure 8 This is a first perspective view showing the outline structure of the tool holder 1. Figure 9 This is a second perspective view showing the outline structure of the tool holder 1. Figure 10 This is a side view showing the outline structure of the tool holder 1. Figure 11 yes Figure 10 An enlarged view of the range XI. Figure 12 This is a bottom view showing the outline structure of the tool holder 1. Figure 13 This shows the outline structure of the tool holder 1. Figure 10 Sectional view XIII-XIII. Figure 14 yes Figure 13 A magnified view of the range XIV.

[0041] The handle 1 can extend along the axis of rotation A from the front end 4 toward the rear end 5. The handle 1 can have a groove 6 located on the side of the front end 4. Examples of materials for the handle 1 include steel, cast iron, and cemented carbide. The front end 4 and the rear end 5 are the front end and rear end of the handle 1, respectively.

[0042] Figure 15 This is a perspective view showing the outline structure of the cutting blade 2. Figure 16 From Figure 15 The top view obtained by observing the cutting insert 2 in the XVI direction. Figure 17 From Figure 15 The top view obtained by observing the cutting blade 2 in the XVII direction. Figure 18 From Figure 15 The top view obtained by observing the cutting insert 2 in the XVIII direction. Figure 19 From Figure 15 The top view obtained by observing the cutting blade 2 in the XIX direction. Figure 20 From Figure 15 The top view obtained by observing the cutting blade 2 from the XX direction.

[0043] The cutting insert 2 can be located in the groove 6. The cutting insert 2 can have a first face 7, a second face 8, a first side face 9, a cutting edge 10, and a through hole 11. The second face 8 can be located on the opposite side of the first face 7. The first side face 9 can be located between the first face 7 and the second face 8. The first side face 9 can be connected to the first face 7. The cutting edge 10 can be located at the intersection of the first face 7 and the first side face 9. The through hole 11 can be opened from the side of the first face 7 to the side of the second face 8. Examples of materials for the cutting edge 10 include hard materials such as CBN (Cubic Boron Nitride) and PCD (PolyCrystalline Diamond). The surface of the cutting edge 10 can be coated with a film formed using chemical vapor deposition (CVD) or physical vapor deposition (PVD). Examples of materials for the film include titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), and aluminum oxide (Al2O3). Examples of materials used for parts other than the cutting edge 10 in the cutting insert 2 include stainless steel, carbon steel, and tool steel.

[0044] Back Figures 8-14 The groove 6 may have a first constraint surface 12, a second constraint surface 13, a first groove 14, and a threaded hole 15. The first constraint surface 12 may abut against the second surface 8. The second constraint surface 13 may abut against the second surface 8. The first groove 14 may extend between the first constraint surface 12 and the second constraint surface 13. The threaded hole 15 may open into the first groove 14.

[0045] Screw 3 can fix the cutting blade 2 to the tool holder 1. Screw 3 can be inserted into the through hole 11 and threaded into the threaded hole 15.

[0046] The cutting tool 101 allows the cutting edge 10 to move away from the threaded hole 15 by either the first constraint surface 12 or the second constraint surface 13, thereby achieving high durability of the cutting insert 2. The cutting tool 101 also allows the cutting insert 2 to be positioned relative to both the first constraint surface 12 and the second constraint surface 13, thus achieving high positioning stability of the cutting insert 2.

[0047] The first constraint surface 12 and the second constraint surface 13 can be located on the same plane. Figure 11 The surface S1 can be the plane configured by the first constraint surface 12 and the second constraint surface 13. This plane can be the same plane. Thus, the first constraint surface 12 and the second constraint surface 13 are planar with each other, thereby further improving the placement stability of the cutting tool 2.

[0048] The first constraint surface 12 can be located on the front end 4 side, which is closer to the second constraint surface 13, and is wider than the second constraint surface 13. Therefore, on the front end 4 side, where it is more likely that the cutting edge 10 will be positioned, the cutting edge 10 can be moved away from the threaded hole 15 by an amount that the first constraint surface 12, which is wider than the second constraint surface 13, thus further improving the durability of the cutting insert 2.

[0049] The cutting edge 10 can be located on the side closer to the front end 4 than the first groove 14. Thus, the front end 4 side of the first constraint surface 12 and the second constraint surface 13 can be used to stably bear the feed force when the cutting tool 101 is cutting.

[0050] The cutting insert 2 may have a second side surface 16. The second side surface 16 may be located between the first side surface 7 and the second side surface 8. The second side surface 16 may be connected to the second side surface 8. The groove 6 may have a third constraint surface 17, a fourth constraint surface 18, and a second groove 19. The third constraint surface 17 may abut against the second side surface 16. The fourth constraint surface 18 may abut against the second side surface 16. The second groove 19 may extend between the third constraint surface 17 and the fourth constraint surface 18. Thus, the load of the cutting tool 101 during cutting can be relieved, so even if the tool holder 1 deflects, the cutting insert 2 can be stably supported by both the front end 4 side and the rear end 5 side of the groove 6.

[0051] The third constraint surface 17 and the fourth constraint surface 18 can be located on the same straight line in a section parallel to the rotation axis A. Therefore, it is difficult to create a step between the third constraint surface 17 and the fourth constraint surface 18, thus further improving the placement stability of the cutting insert 2. As long as the above relationship exists, the third constraint surface 17 and the fourth constraint surface 18 can be either planar or curved surfaces.

[0052] At least a portion of the third constraint surface 17 and at least a portion of the fourth constraint surface 18 may lie on the same plane. Figure 8 Surface S2 can be a plane configured from the aforementioned portions of the third constraint surface 17 and the fourth constraint surface 18. This plane can be the same plane. Thus, the third constraint surface 17 and the fourth constraint surface 18 are planar with each other, thereby further improving the placement stability of the cutting insert 2.

[0053] The third constraint surface 17 can be located on the front end 4 side, which is closer to the fourth constraint surface 18, and is wider than the fourth constraint surface 18. Therefore, on the front end 4 side, where it is more likely that the cutting edge 10 will be positioned, the cutting edge 10 can be moved away from the threaded hole 15 by the amount that the third constraint surface 17, which is wider than the fourth constraint surface 18, thus further improving the durability of the cutting insert 2.

[0054] The cutting edge 10 can be located on the side closer to the front end 4 than the second groove 19. Thus, the front end 4 side of the third constraint surface 17 and the fourth constraint surface 18 can be used to stably bear the main component force when the cutting tool 101 is cutting.

[0055] The first side surface 9 may have a rake face, and the entire first side surface 9 may also be a rake face. The first surface 7 may have a flank face, and the entire first surface 7 may also be a flank face. The second groove 19 may be deeper than the first groove 14. Thus, even if the tool holder 1 deflects significantly on the side of the third constraint surface 17 and the fourth constraint surface 18 due to the main component force when the cutting tool 101 is cutting, it can stably support the cutting insert 2.

[0056] [Implementation Method 2]

[0057] Figure 21 This is a perspective view showing the first step in the manufacturing method of the machined workpiece 301 according to Embodiment 2 of this disclosure. Figure 22 This is a perspective view showing the second step in the manufacturing method of the machined workpiece 301 according to Embodiment 2 of this disclosure. Figure 23 This is a perspective view showing the third step in the manufacturing method of the machined workpiece 301 according to Embodiment 2 of this disclosure.

[0058] The first process is to rotate the cutting tool 101. The cutting tool 101 can be rotated around its rotation axis A as a reference.

[0059] The second step is to bring the cutting tool 101 into contact with the workpiece 201. The rotating cutting tool 101 can be moved to bring it closer to the workpiece 201. The cutting edge 10 can then contact the workpiece 201 to cut it. Examples of materials for the workpiece 201 include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.

[0060] The third step is to move the cutting tool 101 away from the workpiece 201. The cutting tool 101 can be moved to move away from the workpiece 201, thereby obtaining the machined workpiece 301.

[0061] According to the manufacturing method of the machined workpiece 301, by using a cutting tool 101 with high durability of cutting insert 2, the number of times the cutting insert 2 needs to be replaced can be reduced, thereby improving the efficiency of manufacturing the machined workpiece 301. According to the manufacturing method of the machined workpiece 301, by using a cutting tool 101 with high positioning stability of cutting insert 2, the workpiece 201 can be cut with excellent machining accuracy, and a machined workpiece 301 with a high-precision machined surface can be obtained.

[0062] In the second step, the workpiece 201 can be brought closer to the cutting tool 101. In the third step, the workpiece 201 can be moved away from the cutting tool 101. In the case of continuous cutting, it is sufficient to maintain the state of rotation of the cutting tool 101 and repeat the steps of contacting different parts of the workpiece 201 with the cutting edge 10.

[0063] The above describes the manufacturing method of the cutting tool 101 and the workpiece 301. However, this solution is not limited to the above embodiments. Any method can be used as long as it does not deviate from the main idea of ​​this solution.

[0064] The cutting tool 101 can be a milling tool or, for example, a turning tool. When the cutting tool 101 is used as a turning tool, the cutting tool 101 can be rotated in the first step of the manufacturing method of the workpiece 301.

[0065] 〔Summarize〕

[0066] The cutting tool of embodiment 1 of this disclosure has: a tool holder extending from a front end toward a rear end and having a groove on the front end side; a cutting insert located in the groove; and a screw that secures the cutting insert to the tool holder. The cutting insert has: a first face; a second face located opposite to the first face; a first side face located between the first face and the second face and connected to the first face; a cutting edge located at the intersection of the first face and the first side face; and a through hole opening through from the first face side to the second face side. The groove has: a first constraint face and a second constraint face abutting against the second face, respectively; a first groove extending between the first constraint face and the second constraint face; and a threaded hole opening in the first groove. The screw is inserted into the through hole and threaded into the threaded hole.

[0067] The cutting tool of Scheme 2 of this disclosure is based on Scheme 1, wherein the first constraint surface and the second constraint surface are located on the same plane.

[0068] The cutting tool of Scheme 3 of this disclosure is based on Scheme 1 or 2, wherein the first constraint surface is located on the side closer to the front end than the second constraint surface, and is wider than the second constraint surface.

[0069] In embodiment 4 of this disclosure, the cutting tool has the cutting edge located on the side closer to the front end than the first groove, based on any one of embodiments 1 to 3.

[0070] The cutting tool of embodiment 5 of this disclosure, based on any one of embodiments 1 to 4, further comprises a second side surface located between the first surface and the second surface and connected to the second surface, and the groove further comprises: a third constraint surface and a fourth constraint surface respectively abutting against the second side surface; and a second groove extending between the third constraint surface and the fourth constraint surface.

[0071] The cutting tool of Scheme 6 of this disclosure is based on Scheme 5, wherein at least a portion of the third constraint surface and at least a portion of the fourth constraint surface are located on the same plane.

[0072] In the cutting tool of Scheme 7 of this disclosure, based on Scheme 5 or 6, the third constraint surface is located on the side closer to the front end than the fourth constraint surface, and is wider than the fourth constraint surface.

[0073] The cutting tool of embodiment 8 of this disclosure is based on any one of embodiments 5 to 7, wherein the cutting edge is located on the side closer to the front end than the second groove.

[0074] The cutting tool of Scheme 9 of this disclosure is based on any one of Schemes 5 to 8, wherein the first side has a rake face, the first face has a flank face, and the second groove is deeper than the first groove.

[0075] The method for manufacturing a workpiece according to embodiment 10 of this disclosure includes: a step of rotating the cutting tool in any one of embodiments 1 to 9; a step of bringing the cutting tool into contact with the workpiece to be cut; and a step of removing the cutting tool from the workpiece to be cut.

[0076] 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 embodiments described above. That is, various modifications can be made to the invention disclosed herein, and embodiments obtained by appropriately combining the technical solutions disclosed in different embodiments are also included within the technical scope of the invention disclosed herein. In other words, 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 noted that the aforementioned modifications or alterations are also included within the scope of this disclosure.

[0077] Explanation of reference numerals in the attached figures

[0078] 1. Knife handle

[0079] 2 Cutting inserts

[0080] 3 screws

[0081] 4. Frontend

[0082] 5. Backend

[0083] 6 grooves

[0084] 7 First page

[0085] 8. Second page

[0086] 9 First side view

[0087] 10 Cutting edge

[0088] 11 Through Holes

[0089] 12 First constraint surface

[0090] 13 Second Constraint Surface

[0091] 14 First Trough

[0092] 15 Threaded holes

[0093] 16 Second side view

[0094] 17 Third Constraint Surface

[0095] 18 Fourth constraint surface

[0096] 19 Second slot

[0097] 101 Cutting Tools

[0098] 201 Workpiece to be cut

[0099] 301 Workpiece to be machined.

Claims

1. A cutting tool, wherein, The cutting tool has: The handle extends from the front end toward the rear end and has a groove on the front end side; A cutting blade, located in the groove; and Screws secure the cutting blade to the tool holder. The cutting blade has: First impression; The second side is located on the opposite side of the first side; A first side surface, which is located between the first surface and the second surface, and is connected to the first surface; A cutting edge located at the intersection of the first face and the first side face; and A through hole, which opens from the first surface to the second surface. The groove has: The first constraint surface and the second constraint surface respectively abut against the second surface; A first groove extends between the first constraint surface and the second constraint surface; as well as A threaded hole, which is located at the opening of the first slot. The screw is inserted into the through hole and threaded into the threaded hole.

2. The cutting tool according to claim 1, wherein, The first constraint surface and the second constraint surface are located on the same plane.

3. The cutting tool according to claim 1 or 2, wherein, The first constraint surface is located on the front end side of the second constraint surface, and is wider than the second constraint surface.

4. The cutting tool according to any one of claims 1 to 3, wherein, The cutting edge is located on the side closer to the front end than the first groove.

5. The cutting tool according to any one of claims 1 to 4, wherein, The cutting blade also has a second side surface, which is located between the first side surface and the second side surface, and is connected to the second side surface. The groove also has: The third and fourth constraint surfaces respectively abut against the second side surface; and The second groove extends between the third constraint surface and the fourth constraint surface.

6. The cutting tool according to claim 5, wherein, At least a portion of the third constraint surface and at least a portion of the fourth constraint surface lie on the same plane.

7. The cutting tool according to claim 5 or 6, wherein, The third constraint surface is located on the front end side of the fourth constraint surface and is wider than the fourth constraint surface.

8. The cutting tool according to any one of claims 5 to 7, wherein, The cutting edge is located on the side closer to the front end than the second groove.

9. The cutting tool according to any one of claims 5 to 8, wherein, The first side has a rake face. The first face has a back face. The second groove is deeper than the first 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 cutting tool according to any one of claims 1 to 9; The process of bringing the cutting tool into contact with the workpiece; and The process of removing the cutting tool from the workpiece.

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