Cutting tool and method for manufacturing cut product

Abstract

The present disclosure provides a cutting insert having excellent chip discharge properties. A cutting tool according to one aspect of the present disclosure has a main body part and a first cutting part fixed to the main body part. The main body portion has a trunk portion located on the rear end side and a branch portion extending from the trunk portion toward the front end. The first cutting portion has a first rear surface located rearward of the rotation direction of the rotation shaft and a first inner side surface facing the rotation shaft. The branch portion has a first branch portion connected to the trunk portion and the first rear surface, and a second branch portion connected to the trunk portion and the first inner surface.

Description

Technical Field

[0001] This disclosure relates to a method for manufacturing a cutting tool and a workpiece. Examples of cutting tools include rotary tools such as boring tools. Boring tools can be used for machining the inner circumferential surfaces of cylindrical workpieces. Background Technology

[0002] For example, a boring tool, which is a type of rotary tool, is known as the cutting tool described in Patent Document 1. The cutting tool described in Patent Document 1 has a center tube and an annular cutting ring. The cutting ring has a leading arm (trailing arm) and a cutting head. An opening is formed in the center tube for the purpose of weight reduction.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: US Patent Publication No. 2021 / 0060665 Summary of the Invention

[0006] A cutting tool based on one aspect of this disclosure has: a main body extending from a front end toward a rear end along a rotation axis; and a first cutting portion fixed to the main body. The main body has: a main stem located on the rear end side; and a branch extending from the main stem toward the front end. The first cutting portion has: a first rear surface located behind the rotation direction of the rotation axis; and a first inner surface opposite the rotation axis. The branch has: a first branch connected to the main stem and the first rear surface; and a second branch connected to the main stem and the first inner surface. Attached Figure Description

[0007] Figure 1 This is a perspective view of a cutting tool according to an undefined embodiment of the present disclosure, viewed from the rear end.

[0008] Figure 2 Viewed from the front end Figure 1 A three-dimensional view of the cutting tool shown.

[0009] Figure 3 Viewed from the front end Figure 1 The front view of the cutting tool shown.

[0010] Figure 4 From Figure 3 Observe in the direction of arrow A4 as shown Figure 1The side view of the cutting tool shown.

[0011] Figure 5 From Figure 3 Observe in the direction of arrow A3 shown. Figure 1 The side view of the cutting tool shown.

[0012] Figure 6 yes Figure 5 The sectional view along line VI-VI is shown.

[0013] Figure 7 yes Figure 4 The sectional view along line VII-VII is shown.

[0014] Figure 8 It is Figure 1 An enlarged perspective view of the locations of the first and second cutting sections in the cutting tool shown.

[0015] Figure 9 It is shown in magnification Figure 1 The locations of the first and second cutting portions in the cutting tool shown are, from and Figure 8 A stereoscopic image viewed from different angles.

[0016] Figure 10 This is a schematic diagram illustrating a step of a method for manufacturing a machined object according to an undefined embodiment of the present disclosure. Detailed Implementation

[0017] In machining processes, there is a growing demand for improved chip evacuation. This is particularly true for boring tools, where the space for chip evacuation is limited, creating a greater need for enhanced chip evacuation. On the other hand, simply increasing the opening size for the purpose of weight reduction and / or improved chip evacuation may reduce the overall strength of the cutting tool.

[0018] Hereinafter, a method for manufacturing a cutting tool and a workpiece according to an example embodiment of this disclosure will be described in detail using the accompanying drawings. However, for ease of explanation, the drawings referred to below only show the main components necessary for illustrating the embodiment. Therefore, the cutting tool may include any constituent members not shown in the referenced drawings. In addition, the dimensions of the components in the drawings do not faithfully represent the actual dimensions of the constituent members or the dimensional ratios of each component.

[0019] (Cutting tools)

[0020] use Figures 1 to 7The structure of a cutting tool 1, which is not limited to one embodiment, will be described below. The cutting tool 1 is, for example, a rotary tool, and as a specific example, a boring tool can be cited. A boring tool can be used for cutting the inner circumferential surface of a cylindrical workpiece.

[0021] like Figure 1 , Figure 2 As shown, the cutting tool 1 has a rotation axis O1. The rotation axis O1 is the axis through which the cutting tool 1 rotates, not something inherent in the cutting tool 1 as a physical object. The cutting tool 1 rotates about the rotation axis O1 in the rotation direction O2, affecting the workpiece 103 (see reference 1) described later. Figure 10 ( ) is used for cutting.

[0022] The cutting tool 1 may have a main body 10 and a cutting portion 20 fixed to the main body 10. The main body 10 may extend from a front end 10A toward a rear end 10B along the rotation axis O1. The main body 10 may have a main stem 11 located on the rear end 10B side and a branch portion 12 extending from the main stem 11. The branch portion 12 may extend toward the front end 10A.

[0023] <Cutting section>

[0024] like Figures 1 to 7 As shown, the cutting tool 1 may have a first cutting portion 21 having a first cutting edge 21a as a cutting portion 20. Furthermore, the cutting tool 1 may also have a second cutting portion 22 having a second cutting edge 22a as a cutting portion 20. The second cutting portion 22 may be located behind the first cutting portion 21 in the rotation direction O2 of the rotation axis O1. The second cutting portion 22 may also be located at the same distance from the first cutting portion 21 relative to the rotation axis O1.

[0025] The cutting tool 1 may also have a third cutting part 23 with a third cutting edge 23a as a cutting part 20. The third cutting part 23 may be located on the side closer to the front end 10A than the first cutting part 21 and the second cutting part 22 and closer to the rotation axis O1 than the first cutting part 21.

[0026] The cutting tool 1 may also have a fourth cutting portion 24 having a fourth cutting edge 24a as a cutting portion 20. The fourth cutting portion 24 may be located on the rear end 10B side of the first cutting portion 21 and the second cutting portion 22, and at the same distance from the rotation axis O1 as the first cutting portion 21.

[0027] like Figure 1 , Figure 8As shown, the first cutting portion 21 may have a first rear surface 211 located behind the rotation direction O2 of the rotation axis O1 and a first inner surface 212 opposite to the rotation axis O1. Similarly, the second cutting portion 22 may have a second rear surface 221 located behind the rotation direction O2 of the rotation axis O1 and a second inner surface 222 opposite to the rotation axis O1.

[0028] Similar to the first cutting portion 21 and the second cutting portion 22, the third cutting portion 23 and the fourth cutting portion 24 may also have a rear surface located behind the rotation direction O2 of the rotating shaft O1 and an inner surface opposite to the rotating shaft O1, respectively.

[0029] In addition, such as Figure 8 As shown, the first cutting section 21 may include a cutting insert 201 with a cutting edge, a housing 202, and a holding section 203. The second cutting sections 22 to the fourth cutting sections 24 may also include the same cutting insert 201, housing 202, and holding section 203 as the first cutting section 21.

[0030] A cutting blade 201 is mounted on the housing 202. The housing 202 may have a groove on one side of the front end 10A for mounting the cutting blade 201, in which the cutting blade 201 is mounted. The housing 202 is not limited to a specific shape and may be a rod shape, a polygonal plate shape, or a polygonal prism shape, etc.

[0031] A box 202 is installed in the retaining part 203. The retaining part 203 can be formed as part of the main body 10.

[0032] like Figure 1 , Figure 8 , Figure 9 As shown, the first rear surface 211 and the first inner surface 212 of the first cutting portion 21 can be formed in the holding portion 203. The second rear surface 221 and the second inner surface 222 of the second cutting portion 22 can also be formed in the holding portion 203.

[0033] When the first cutting section 21 to the fourth cutting section 24 are equipped with cutting inserts 201, the cutting insert 201 of the first cutting section 21 has a first cutting edge 21a, and the cutting insert 201 of the second cutting section 22 has a second cutting edge 22a. In addition, the cutting insert 201 of the third cutting section 23 has a third cutting edge 23a, and the cutting insert 201 of the fourth cutting section 24 has a fourth cutting edge 24a.

[0034] The cutting insert 201 is not limited to a specific shape; it can be a diamond-shaped plate, a triangular plate, or the like. The shape of the cutting insert 201 can be different between the first cutting section 21 and the fourth cutting section 24.

[0035] When the cutting insert 201 is a rhomboid plate or a triangular shape, in the first cutting section 21, the first cutting edge 21a can be located at the intersection of the two sides of the apex of the front end 10A of the cutting insert 201. By making the first cutting edge 21a and the workpiece 103 (see reference) Figure 10 ( ) contact, enabling cutting processing.

[0036] The second cutting section 22 to the fourth cutting section 24 are the same as the first cutting section 21. That is, when the cutting insert 201 is a rhomboid plate or a triangular shape, the second cutting edge 22a, the third cutting edge 23a, or the fourth cutting edge 24a can be located at the intersection of the two sides of the apex of the front end 10A of the respective cutting insert 201. By positioning the second cutting edge 22a, the third cutting edge 23a, or the fourth cutting edge 24a with the workpiece 103 (see reference 103)... Figure 10 ( ) contact, enabling cutting processing.

[0037] Materials used for the cutting insert 201 can include, for example, cemented carbide and cermet. Compositions of cemented carbide can include, for example, WC-Co, WC-TiC-Co, and WC-TiC-TaC-Co. Here, WC, TiC, and TaC can be hard particles, and Co can be a bonding phase.

[0038] Cermets can be sintered composite materials made by combining metal and ceramic components. Examples of cermets include titanium compounds with titanium carbide (TiC) or titanium nitride (TiN) as the main component. The material of the cutting insert 201 is not limited to the above composition.

[0039] The surface of the cutting insert 201 can be coated with a film formed using chemical vapor deposition (CVD) or physical vapor deposition (PVD). Examples of the film composition include titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), and aluminum oxide (Al2O3).

[0040] Alternatively, the cutting tool 1 may also have multiple first cutting sections 21. For example... Figure 3 As shown, in a structure having two first cutting portions 21, the first cutting portion 21 and the other first cutting portion 21 can be arranged in a position opposite each other across the rotation axis O1.

[0041] The second cutting section 22 to the fourth cutting section 24 can be multiple, just like the first cutting section 21. For example... Figure 3 As shown, in a structure having two second cutting portions 22 to four fourth cutting portions 24, the second cutting portions 22 to four fourth cutting portions 24 and another second cutting portion 22 to four fourth cutting portions 24 can be arranged in positions opposite each other across the rotation axis O1.

[0042] <Main Body>

[0043] like Figures 1 to 7 As shown, the main body 10 of the fixed cutting part 20 may have a main stem 11 located on the rear end 10B side and a branch 12 extending from the main stem. The branch 12 may extend toward the front end 10A. The first cutting part 21, the second cutting part 22 and the third cutting part 23 described above as the cutting part 20 may be fixed to the branch 12.

[0044] By configuring the main body 10 with such a structure, the portion separating the inner and outer sides of the main body 10 in the branch portion 12, i.e., the portion that acts as a barrier when the chips generated by the cutting portion 20 flow toward the rear end 10B, does not exist except in the branch portion 12. Therefore, the chips cut by the first cutting portion 21, the second cutting portion 22, and the third cutting portion 23 flow from the hollowed-out inner side of the main body 10 through the large opening between the branch portions 12 toward the rear end 10B and are discharged.

[0045] Therefore, compared to cutting tools with a shaft extending along the axis of rotation at the center of the main body, chip removal performance is significantly improved. Furthermore, compared to cutting tools where the shaft of the main body is hollow and an opening communicating with the internal hollow space is provided on the outer periphery of the shaft, the portion that acts as a barrier to chip flow is significantly reduced, thus improving chip removal performance.

[0046] Furthermore, since the first cutting section 21, the second cutting section 22, and the third cutting section 23 are each supported only by the branch section 12, the generated chips enter the inner side of the main body 10 from between the branch sections 12 and flow inside the main body 10. Therefore, it is possible to reduce the amount of chips in the workpiece 103 (refer to...) Figure 10 The amount of chips flowing on the outer side of the main body 10 with the machined surface can reduce the possibility of damaging the machined surface.

[0047] like Figure 2 , Figure 6 As shown, the main stem 11 can be hollow. That is, the main stem 11 can be hollow inside, with only the outer periphery remaining. For example, the main stem 11 can be a cylindrical shape with a hole 11A formed in its central portion along the rotation axis O1. In addition, the main stem 11 can be located on a part of the outer periphery of the main body 10, and there can be an opening on the outer periphery of the main body 10 where the main stem 11 is not disposed.

[0048] For example, such as Figure 2 , Figure 4 As shown, when from Figure 3When viewed in the direction of arrow A4, the main stem 11 may have a triangular or trapezoidal opening 14 protruding from the front end 10A towards the rear end 10B. In other words, as... Figure 5 As shown, when from Figure 3 When viewed in the direction of arrow A3, the main stem 11 can be divided into a triangular shape protruding from the rear end 10B towards the front end 10A. For example... Figure 1 , Figure 2 As shown, the parts that form such a triangular shape can be arranged in pairs with the rotation axis O1 facing each other.

[0049] like Figure 3 As shown, the directions of arrows A1 and A3 are orthogonal to the rotation axis O1, and the directions of arrows A1 and A3 differ by 180°. The directions of arrows A2 and A4 are also orthogonal to the rotation axis O1, and the directions of arrows A2 and A4 differ by 180°. The directions of arrows A1, A2, A3, and A4 are all offset by 90° along the rotation direction O2.

[0050] In this way, the main body 11 is also hollowed out, and through the opening 14 that communicates with the outside of the main body 10, the chips cut by the first cutting part 21, the second cutting part 22 and the third cutting part 23 are also discharged to the rear end 10B side through the opening 14. As a result, the chip discharge performance can be made into a structure with better performance.

[0051] In addition, such as Figure 6 As shown, the main stem 11 can be bent inwards with the side containing the rotation axis O1 as the inner side. Furthermore, the main stem 11 can be bulging outwards from the rear end 10B towards the front end 10A in a direction away from the rotation axis O1. The aforementioned opening 14 can open towards the rear end 10B. The thickness of the plate-like portion of the main stem 11 may not be uniform, and the portion connecting the branch 12 may be formed to be thicker than other portions. Additionally, the outer and inner peripheral surfaces of the main stem 11 can be smooth.

[0052] like Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, branch 12 may have a first branch 121 and a second branch 122. In Figure 1 , Figure 4 In the middle, the parts corresponding to the first branch 121 and the second branch 122 are enclosed by dashed lines.

[0053] like Figure 1 , Figure 2 , Figure 8As shown, the first branch 121 can be connected to the main body 11 and the first rear surface 211 of the first cutting portion 21 described above. In addition, the second branch 122 can be connected to the main body 11 and the first inner surface 212 of the first cutting portion 21.

[0054] When the inner cavity of the main body 10 is hollowed out to fix the cutting part 20 to the branch 12, the chip removal performance is excellent, but on the other hand, the holding force of the cutting part 20 may be reduced. By adopting the above structure, the first cutting part 21 can be held by both the first branch 121 and the second branch 122. Therefore, compared with the structure in which the first cutting part 21 is held by only either the first branch 121 or the second branch 122, the holding force of the first cutting part 21 can be improved.

[0055] Furthermore, the first rear surface 211 is the part of the first cutting section 21 where the strongest load is applied. However, as described above, by connecting and supporting the first branch 121 to the first rear surface 211, the load applied to the first cutting section 21 can be reliably borne, thereby firmly holding the first cutting section 21 in place. In addition, since the second branch 122 is connected to the first inner surface 212 in the first cutting section 21, the flow of chips generated in the first cutting section 21 can be effectively prevented from being obstructed by the second branch 122.

[0056] Furthermore, by utilizing the first branch 121 supporting the first rear surface 211 to support the first cutting portion 21 circumferentially, and the second branch 122 supporting the first inner surface 212 to support the radial direction of the rotation axis O1, support can be provided from both circumferential and radial directions. Therefore, for example, compared to a structure that supports the first cutting portion 21 from both sides circumferentially along the rotation axis O1, the first cutting portion 21 can be held more effectively and firmly.

[0057] The first branch 121 and the second branch 122 can extend toward the front end 10A. The first branch 121 can also extend forward toward the rotation direction O2 of the rotation axis O1 in the same direction as the front end 10A. The second branch 122 can also extend backward toward the rotation direction O2 of the rotation axis O1 in the same direction as the front end 10A.

[0058] In addition, such as Figure 1 , Figure 2 , Figure 8 , Figure 9 As shown, the portion P1 connected to the first branch 121 and the first rear surface 211 can be located on the front end 10A side compared to the portion P2 connected to the second branch 122 and the first inner surface 212.

[0059] During cutting, a significant portion of the load applied to the first cutting section 21 is concentrated on the front end 10A side of the first cutting edge 21a. By arranging it as described above, the portion P1 connected to the first branch 121 and the first rear surface 211 can bear the main component of the load applied to the front end 10A side of the first cutting section 21. Therefore, the load applied to the first cutting section 21 can be reliably withstood, and it can be effectively and securely maintained.

[0060] Furthermore, the portion P2 connected to the second branch 122 and the first inner side 212 is located on the side where chips are generated. Therefore, as described above, by setting the portion P2 to a position that is recessed towards the rear end 10B than the portion P1, it is possible to more effectively prevent the flow of chips generated in the first cutting section 21 from being obstructed by the second branch 122.

[0061] In addition, such as Figure 1 , Figure 8 As shown, the area of ​​the portion P1 connected to the first branch 121 and the first rear surface 211 can be made larger than the area of ​​the portion P2 connected to the second branch 122 and the first inner surface 212. That is, the area of ​​the connecting surface between the first branch 121 and the first rear surface 211 can also be made larger than the area of ​​the connecting surface between the second branch 122 and the first inner surface 212.

[0062] During cutting, the load applied to the first cutting portion 21 is greater on the first rear surface 211 than on the first inner surface 212. As described above, by making the area of ​​the portion P1 to which the large load is applied larger than that of the portion P2, the load applied to the first cutting portion 21 can be reliably borne, and the first cutting portion 21 can be held more effectively.

[0063] like Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, branch 12 may also have a third branch 123 and a fourth branch 124. Figure 4 In the middle, the parts corresponding to the third branch 123 and the fourth branch 124 are enclosed by dashed lines.

[0064] like Figure 1 , Figure 2 , Figure 8 As shown, the third branch 123 can be connected to the main body 11 and the second rear surface 221 of the second cutting section 22 described above. Additionally, the fourth branch 124 can be connected to the main body 11 and the second inner surface 222 of the second cutting section 22.

[0065] By adopting the above structure, the second cutting portion 22 can be held using both the third branch 123 and the fourth branch 124. Therefore, compared with a structure in which the second cutting portion 22 is held by only one of the third branch 123 and the fourth branch 124, the holding force of the second cutting portion 22 can be improved.

[0066] Furthermore, similarly to the first cutting section 21, the second cutting section 22 also employs the aforementioned structure, connecting and supporting the third branch 123 to the second rear surface 221, which is subjected to a greater load. This reliably withstands the load applied to the second cutting section 22, thereby firmly holding the second cutting section 22 in place. Moreover, since the fourth branch 124 is connected to the second inner surface 222 in the second cutting section 22, the flow of chips generated in the second cutting section 22 can be effectively prevented from being obstructed by the fourth branch 124.

[0067] In addition, similar to the first cutting part 21, by adopting the above structure, the second cutting part 22 can be supported from both the circumferential and radial directions of the rotation axis O1 by the third branch 123 supporting the second rear surface 221 and the fourth branch 124 supporting the second inner surface 222, and the second cutting part 22 can be effectively and firmly held.

[0068] In addition, such as Figure 1 , Figure 8 , Figure 9 As shown, the portion P3 connected to the third branch 123 and the second rear surface 221 can be located on the front end 10A side compared to the portion P4 connected to the fourth branch 124 and the second inner surface 222.

[0069] The load applied during cutting is relatively large on the front end 10A side of the second cutting section 22, where the second cutting edge 22a is located. Therefore, by adopting the above structure, the main component of the load applied to the front end 10A side of the second cutting section 22 can be borne by the portion P3 connected to the third branch 123 and the second rear surface 221. As a result, the load applied to the second cutting section 22 can be reliably borne, and it can be effectively and firmly maintained.

[0070] Furthermore, the portion P4 connected to the fourth branch 124 and the second inner side 222 is located on the side where chips are generated. Therefore, as described above, by setting the portion P4 to a position that is recessed towards the rear end 10B than the portion P3, it is possible to more effectively prevent the flow of chips generated in the second cutting section 22 from being obstructed by the fourth branch 124.

[0071] Furthermore, the area of ​​the portion P3 connected to the third branch 123 and the second rear surface 221 can be made larger than the area of ​​the portion P4 connected to the fourth branch 124 and the second inner surface 222. That is, the area of ​​the connection surface between the third branch 123 and the second rear surface 221 can be made larger than the area of ​​the connection surface between the fourth branch 124 and the second inner surface 222.

[0072] During the cutting process, the load applied to the second cutting portion 22 is greater on the second rear surface 221 than on the second inner surface 222. As described above, by making the area of ​​the portion P3 to which the large load is applied larger than that of the portion P4, the load applied to the second cutting portion 22 can be reliably borne, and the second cutting portion 22 can be held more effectively.

[0073] Alternatively, the first branch 121 to the fourth branch 124 can also be formed so that they move away from the rotation axis O1 as they move toward the front end 10A. By setting it in this way, the overall length can be shortened, and it is difficult to bend even with the same thickness, making it a load-bearing structure.

[0074] In addition, such as Figure 4 As shown, the first branch 121 can also be made thicker than the second branch 122. In other words, the area of ​​the cross section cut along a direction orthogonal to the extension direction can also be made larger than that of the first branch 121 than that of the second branch 122.

[0075] It should be noted that when the thickness of the first branch 121 and the second branch 122 is not constant, the area of ​​the cross-section with the smallest cross-sectional area can be compared.

[0076] During machining, the load applied to the first cutting section 21 is greater in the first branch 121, which is located behind the rotational direction O2 supporting the first cutting section 21, than in the second branch 122. This structure improves the durability of the first branch 121, which is subjected to a large load. In the second branch 122, the portion that becomes a barrier to chip flow is not unnecessarily enlarged, thus ensuring chip removal. Therefore, the portion that becomes a barrier to chip flow is reduced, and the first cutting section 21 is firmly held in place.

[0077] Furthermore, in the cutting tool 1, the first branch 121 to the fourth branch 124 can each be a straight line. As for the shape of the branch 12, the straight line shape is more resistant to bending than the flexible shape. Therefore, by adopting the above structure, it is difficult to bend even when a load is applied during cutting.

[0078] And, as Figures 1-5As shown, the branch 12 may have a fifth branch 125 extending from the first branch 121 and / or the second branch 122, or the third branch 123 and / or the fourth branch 124 toward the front end 10A. In this case, the aforementioned holding portion 203 of the third cutting portion 23 may be formed in the fifth branch 125.

[0079] Based on the above structure, the workpiece 103 (refer to) is cut using the first cutting part 21 and the second cutting part 22. Figure 10 Machining workpiece 103 (refer to) Figure 10 When machining the large-diameter hole 104, the small-diameter hole 105 can be machined using the third cutting part 23. Since the small-diameter hole 105 can be machined simultaneously in the process of machining the large-diameter hole 104, there is no positional offset between the large-diameter hole 104 and the small-diameter hole 105, and it can be formed with good accuracy. In addition, the number of processes can also be reduced.

[0080] Furthermore, in the structure where the fifth branch 125 supporting the third cutting section 23 extends from the main body 11, the fifth branch 125 becomes a barrier to the flow of chips, narrowing the space that serves as a passage for chip flow. By adopting the above structure, the space that serves as a passage for chip flow can be more effectively secured.

[0081] Furthermore, in a structure having two third cutting sections 23, such as Figure 1 , Figure 5 , Figure 6 As shown, the third cutting portion 23 and another third cutting portion 23 can be connected to each other via a connecting portion 13, which is part of the main body portion 10. The connecting portion 13 can be a shaft as shown in one example, or it can be a structure formed by connecting the front ends of multiple fifth branch portions 125 to each other.

[0082] Moreover, such as Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, the branch 12 may have a sixth branch 126 extending radially toward the rotation axis O1 on the rear end 10B side of the main stem 11. The aforementioned fourth cutting portion 24 may be fixed to the main stem 11 and the sixth branch 126. In this case, the aforementioned retaining portion 203 of the fourth cutting portion 24 may be formed to span across the main stem 11 and the sixth branch 126.

[0083] Examples of materials that can be used for the main body 10 include stainless steel, cast iron, and aluminum alloys. In particular, when steel is used in these components, the components have high toughness.

[0084] (Methods for manufacturing workpieces that have been machined)

[0085] Next, use Figure 10The manufacturing method of a workpiece with a non-limiting aspect of this disclosure will be described. The case in which a large-diameter hole 104 is formed on the workpiece 103 using the first cutting part 21, the third cutting part 23 and the fourth cutting part 24 in the cutting tool 1, and a small-diameter hole 105 is formed on the workpiece 103 using the second cutting part 22 will be described.

[0086] The workpiece 101 is manufactured by machining the workpiece 103. The manufacturing method of the workpiece 101 in this embodiment includes the following steps:

[0087] (1) The process of rotating the cutting tool 1;

[0088] (2) The process of bringing the cutting tool 1 into contact with the workpiece 103; and

[0089] (3) The process of moving the cutting tool 1 away from the workpiece 103.

[0090] More specifically, firstly, such as Figure 10 As shown by reference numeral 901 in the accompanying drawing, the cutting tool 1 can be rotated about the rotation axis O1 in the rotation direction O2, and relative to the workpiece 103 being approached. Next, as... Figure 10 As shown by reference numeral 902 in the accompanying drawings, at least a portion of the cutting edge of the cutting tool 1 can be made to contact the workpiece 103 to cut it. Furthermore, as... Figure 10 As shown by reference numeral 903 in the attached drawing, the cutting tool 1 can be moved relatively away from the workpiece 103 (workpiece 101).

[0091] like Figure 10 As shown by reference numeral 901 in the attached drawing, the cutting tool 1 can be moved forward in a rotating state ( Figure 10 The cutting tool 1 moves in the downward direction, thereby bringing it closer to the workpiece 103 being cut.

[0092] In addition, such as Figure 10 As shown by reference numeral 902 in the accompanying drawings, the cutting tool 1 can be moved forward while at least a portion of the cutting edge is in contact with the workpiece 103, thereby cutting the workpiece 103.

[0093] In addition, such as Figure 10 As shown by reference numeral 903 in the attached drawing, the cutting tool 1 can be moved backward while rotating ( Figure 10 The cutting tool 1 moves away from the workpiece 103 by moving upwards (in the middle direction).

[0094] In each process, the cutting tool 1 is moved to contact the workpiece 103 or to move away from the workpiece 103, but it is not limited to this situation.

[0095] For example, in step (1), the workpiece 103 can be brought close to the cutting tool 1. In step (3), the workpiece 103 can be moved away from the cutting tool 1. If the cutting process continues, the steps of maintaining the state of rotation of the cutting tool 1 and bringing at least a portion of the cutting edge into contact with different parts of the workpiece 103 can be repeated.

[0096] Representative examples of the material of the workpiece 103 include hardened steel, carbon steel, alloy steel, stainless steel, cast iron, or non-ferrous metals.

[0097] <Summary>

[0098] The cutting tool of embodiment 1 of this disclosure has: a main body extending from a front end toward a rear end along a rotation axis; and a first cutting portion fixed to the main body. The main body has: a main stem located on the rear end side; and a branch extending from the main stem toward the front end. The first cutting portion has: a first rear surface located behind the rotation direction of the rotation axis; and a first inner surface opposite the rotation axis. The branch has: a first branch connected to the main stem and the first rear surface; and a second branch connected to the main stem and the first inner surface.

[0099] In Scheme 2 of this disclosure, the cutting tool, based on Scheme 1, has a portion connected to the first branch and the first rear surface located closer to the front end than the portion connected to the second branch and the first inner surface.

[0100] In embodiment 3 of this disclosure, the cutting tool is based on embodiment 1 or 2, wherein the first branch extends forward toward the direction of rotation of the rotating axis as it moves toward the front end.

[0101] In embodiment 4 of this disclosure, the cutting tool is based on any one of embodiments 1 to 3, wherein the second branch extends rearward toward the direction of rotation of the rotating axis as it moves toward the front end.

[0102] In embodiment 5 of this disclosure, the area of ​​the cutting tool connected to the first branch and the first rear surface is greater than the area of ​​the portion connected to the second branch and the first inner surface, based on any one of embodiments 1 to 4.

[0103] The cutting tool in embodiment 6 of this disclosure, based on any one of embodiments 1 to 5, further comprises a second cutting portion located rearward relative to the first cutting portion in the rotational direction and fixed to the main body. The second cutting portion comprises: a second rear surface located rearward in the rotational direction of the rotational axis; and a second inner surface opposite to the rotational axis. The branch portion comprises: a third branch portion connected to the main body and the second rear surface; and a fourth branch portion connected to the main body and the second inner surface.

[0104] In embodiment 7 of this disclosure, the cutting tool, based on embodiment 6, has a portion that connects to the third branch and the second rear surface located closer to the front end than the portion that connects to the fourth branch and the second inner surface.

[0105] In embodiment 8 of this disclosure, the cutting tool, based on embodiment 6, has a larger area in the portion connected to the first branch and the first rear surface than in the portion connected to the third branch and the second rear surface.

[0106] The cutting tool in Scheme 9 of this disclosure is based on any of Schemes 1 to 8, wherein the main body is hollow.

[0107] In embodiment 10 of this disclosure, the cutting tool is based on embodiment 9, wherein the main stem is located on a portion of the outer periphery of the main body, and an opening is provided on the outer periphery of the main body where the main stem is not disposed.

[0108] The method for manufacturing a workpiece according to embodiment 11 of this disclosure includes: a step of rotating a cutting tool of any one of embodiments 1 to 10; a step of bringing the cutting tool into contact with a workpiece to be cut; and a step of moving the cutting tool away from the workpiece to be cut.

[0109] [Additional Notes]

[0110] 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, the invention disclosed herein can be modified in various ways within the scope shown in this disclosure, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the invention disclosed herein. In other words, it should be noted that anyone skilled in the art can easily make various modifications or alterations based on this disclosure. Furthermore, please note that these modifications or alterations are included within the scope of this disclosure.

[0111] Explanation of reference numerals in the attached figures:

[0112] 1. Cutting tools

[0113] 10 Main Body

[0114] 10B Backend

[0115] 10A Front End

[0116] 11 Key Cadres

[0117] 12 Branches

[0118] 14 Opening

[0119] 20 Cutting section

[0120] 21 First cutting section

[0121] 21a First cutting edge

[0122] 22 Second cutting section

[0123] 22a Second cutting edge

[0124] 23 Third Cutting Section

[0125] 23a Third cutting edge

[0126] 24 Fourth cutting section

[0127] 24a Fourth cutting edge

[0128] 101 Workpiece being machined

[0129] 103 Workpiece to be cut

[0130] 121 First Branch

[0131] 122 Second Branch

[0132] 123 Third Branch

[0133] 124 Fourth Branch

[0134] 211 First rear surface

[0135] 212 First inner surface

[0136] 221 Second rear surface

[0137] 222 Second inner surface

[0138] O1 Rotating Axis

[0139] O2 rotation direction.

Claims

1. A cutting tool, wherein, The cutting tool has: The main body extends from the front end toward the rear end along the axis of rotation; and The first cutting part is fixed to the main body. The main body portion has: The main stem, located on the rear end side; and A branch that extends from the main trunk toward the front end. The first cutting part has: The first rear surface is located behind the rotational direction of the rotation axis; and The first inner surface is opposite to the rotation axis. The branch has: A first branch, which connects to the main trunk and the first rear surface; and The second branch is connected to the main stem and the first inner side.

2. The cutting tool according to claim 1, wherein, The portion connected to the first branch and the first rear surface is located closer to the front end than the portion connected to the second branch and the first inner surface.

3. The cutting tool according to claim 1 or 2, wherein, The first branch extends forward toward the direction of rotation of the rotation axis as it moves toward the front end.

4. The cutting tool according to any one of claims 1 to 3, wherein, The second branch extends rearward toward the direction of rotation of the rotating axis as it moves toward the front end.

5. The cutting tool according to any one of claims 1 to 4, wherein, The area of ​​the portion connected to the first branch and the first rear surface is greater than the area of ​​the portion connected to the second branch and the first inner surface.

6. The cutting tool according to any one of claims 1 to 5, wherein, The cutting tool also has a second cutting portion located rearward relative to the first cutting portion in the rotation direction and fixed to the main body. The second cutting part has: The second rear surface is located behind the rotational direction of the rotation axis; and The second inner surface is opposite to the rotation axis. The branch has: The third branch, which connects to the main trunk and the second rear surface; and The fourth branch is connected to the main stem and the second inner side.

7. The cutting tool according to claim 6, wherein, The portion that connects to the third branch and the second rear surface is located closer to the front end than the portion that connects to the fourth branch and the second inner surface.

8. The cutting tool according to claim 6, wherein, The area of ​​the portion connected to the first branch and the first rear surface is greater than the area of ​​the portion connected to the third branch and the second rear surface.

9. The cutting tool according to any one of claims 1 to 8, wherein, The main stem is hollow.

10. The cutting tool according to claim 9, wherein, The main stem is located on a portion of the outer periphery of the main body. The opening on the outer periphery of the main body is not where the main body is located.

11. A method for manufacturing a workpiece that has undergone machining, wherein, The method for manufacturing the workpiece includes: The process of rotating the cutting tool according to any one of claims 1 to 10; The process of bringing the cutting tool into contact with the workpiece; and The process of moving the cutting tool away from the workpiece.

Images