Cutting tool and method for manufacturing machined product

Abstract

The purpose of the invention is to enable firm fixing of an insert to a holder with a clamper interposed therebetween and to enable easy loosening of a screw to replace the insert. A cutting tool of a non-limiting example in the present disclosure comprises a holder, an insert, a clamper, and a screw. The holder has a tip face, a pocket, a first hole, and a second hole. The insert is located in the pocket. The clamper is capable of restraining the insert and has a through hole that opens to the second hole when the clamper is inserted into the first hole. The screw is inserted into the second hole and the through hole. The through hole has a first tapered surface, and the screw has a second tapered surface. By tightening the screw, the second tapered surface slides with respect to the first tapered surface, and the clamper can be drawn into the first hole.

Description

[Technical Field]

[0001] The present disclosure relates to a cutting tool used when cutting a workpiece such as a metal, and a method for manufacturing a machined product. [Background technology]

[0002] For example, cutting tools described in Patent Documents 1 and 2 are known as cutting tools used when cutting workpieces such as metals. The cutting tool described in Patent Document 1 has a holder body, a cutting insert (hereinafter simply referred to as an insert), a clamping member, and a locking member. The clamping member and the locking member in Patent Document 1 each have abutment surfaces, and when these abutment surfaces come into contact, the clamping member slides, thereby constraining the insert. Furthermore, the cutting tool described in Patent Document 2 has a tool head, an insert, a screw, and a clamp. In Patent Document 2, the insert is constrained by the clamp sliding when the screw is attached. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2015-502865 [Patent Document 2] Special Publication No. 2015-500149 Summary of the Invention

[0004] A non-limiting example of a cutting tool according to the present disclosure includes a rod-shaped holder extending from a tip end to a rear end along a central axis, an insert, a clamper, and a screw. The holder has a tip end surface located on the tip end side, a bottom surface parallel to the central axis, a pocket located on the tip end side, a first hole extending from the bottom surface in a direction intersecting the central axis, and a second hole extending from the tip end surface toward the rear end and connected to the first hole. The insert is located in the pocket. The clamper is capable of restraining the insert, and has a through hole inserted into the first hole and opening toward the second hole. A screw is inserted into the second hole and the through hole. The through hole has a first tapered surface located at an opening toward the second hole, and the screw has a second tapered surface abutting the first tapered surface. Then, by tightening the screw, the second tapered surface slides relative to the first tapered surface, and the clamper can be pulled into the first hole. [Brief explanation of the drawings]

[0005] [Figure 1] FIG. 1 is a perspective view of a cutting tool according to a non-limiting embodiment of the present disclosure. [Figure 2] 2 is an enlarged view of an area A1 shown in FIG. 1, in which the cutting tool is disassembled. [Figure 3] FIG. 2 is a front view of the cutting tool shown in FIG. 1 as viewed from the tip side. [Figure 4] FIG. 4 is a side view of the cutting tool shown in FIG. 3, viewed from a direction B1. [Figure 5] FIG. 4 is a plan view of the cutting tool shown in FIG. 3 as viewed from a direction B2. [Figure 6] FIG. 4 is a side view of the cutting tool shown in FIG. 3, viewed from a direction B3. [Figure 7] FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. 4. [Figure 8] FIG. 8 is an enlarged view of an area A2 shown in FIG. [Figure 9] 1 is a schematic diagram illustrating a step in a method for manufacturing a machined product in one non-limiting example. [Figure 10]1 is a schematic diagram illustrating a step in a method for manufacturing a machined product in one non-limiting example. [Figure 11] 1 is a schematic diagram illustrating a step in a method for manufacturing a machined product in one non-limiting example. DETAILED DESCRIPTION OF THE INVENTION

[0006] A non-limiting example of a cutting tool and a method for manufacturing a cutting compound according to the present disclosure will be described in detail with reference to the drawings. Examples of cutting tools include turning tools and milling tools. Examples of turning tools include grooving tools and cut-off tools. Grooving tools can be used, for example, for groove processing. The non-limiting example cutting tool 100 shown in FIG. 1 is a turning tool, more specifically, a grooving tool. For ease of explanation, the figures referenced below show only the main components constituting the non-limiting embodiment in a simplified form. Therefore, the cutting tool 100 may include optional components not shown in the figures referenced. Furthermore, the dimensions of the components in the figures do not necessarily faithfully represent the actual dimensions of the components and the dimensional ratios of each component.

[0007] In each drawing, the X-axis direction is the left-right direction, the Z-axis direction is the up-down direction, and the Y-axis direction is the front-back direction. In Fig. 1, the side where the insert 2 is located is the right side in the X-axis direction, the front side in the Y-axis direction, and the top side in the Z-axis direction.

[0008] A non-limiting example of a cutting tool 100 shown in FIGS. 1 to 8 includes a holder 1, an insert 2, a clamper 3, and a screw 4.

[0009] <Holder> The holder 1 may be rod-shaped and extend from a first end 1a to a second end 1b along a first central axis L1. As shown in Fig. 1, the holder 1 may be rectangular prism-shaped. The first end 1a may also be referred to as the "front end 1a," and the second end 1b may also be referred to as the "rear end 1b."

[0010] In a non-limiting example shown in FIG. 1, the front end of the holder 1 in the Y-axis direction may be a leading end 1a, and the rear end may be a trailing end 1b.

[0011] There are no particular limitations on the size of the holder 1. For example, the length along the first central axis L1 can be set to approximately 5 mm to 100 mm. The height from the top to the bottom, in other words, the width in the vertical direction, can be set to approximately 5 mm to 50 mm.

[0012] Steel, cast iron, etc. may be used as the material of the holder 1. In particular, when steel is used among these materials, the holder 1 has high toughness.

[0013] The holder 1 may have a head 17 and a shank 18. The head 17 may be located on the tip 1a side of the holder 1. The head 17 may include an end face on the tip 1a side, as shown in FIG.

[0014] The shank 18 may be located closer to the rear end 1b than the head 17. The shank 18 may include an end face on the rear end 1b side, as shown in Fig. 1. The shank 18 may be located closer to the rear end 1b than the head 17, and may include a central portion of the holder 1 in the direction along the first central axis L1, as shown in Fig. 1.

[0015] The shank 18 may be a portion that is held by a machine tool when the cutting tool 100 is attached to the machine tool. On the other hand, the head 17 is a portion for holding the insert 2 and has a pocket 12, which will be described later. When the shank 18 is a portion that can be held by a machine tool, it generally has a simple cylindrical or prismatic shape. Therefore, the central axis of this shank 18 may be regarded as the first central axis L1 of the holder 1.

[0016] <head> The head 17 of the holder 1 may have a tip surface 11 , a pocket 12 , a first hole 13 , and a second hole 14 .

[0017] The tip surface 11 may be located on the tip 1a side of the head 17. The tip surface 11 is not limited to a configuration perpendicular to the first central axis L1. For example, the tip surface 11 may be configured to be inclined with respect to the first central axis L1, as shown in FIGS. 2 and 6. Furthermore, the tip surface 11 does not have to be formed by a single plane. For example, the tip surface 11 may be formed by a plurality of planes, as shown in FIGS. 2 and 6, or may be formed by a curved surface.

[0018] The pocket 12 may be located on the side of the tip 1a of the head 17. The pocket 12 may be continuous with the tip surface 11, or may extend from the tip surface 11 toward the rear end 1b. The insert 2 can be attached to the pocket 12.

[0019] The pocket 12 is formed by cutting out a portion of the right side surface of the head 17 on the side of the tip 1a, and may have a bottom surface 121 parallel to the first central axis L1 and a constraining side surface 122 that is perpendicular to the bottom surface 121 and constrains a lower surface 22 of the insert 2, which will be described later. Here, "parallel" does not have to be strictly parallel. The bottom surface 121 may have a certain angle, such as 5°, with respect to the first central axis L1. The bottom surface 121 may be a surface that the insert 2 abuts against in the pocket 12, or the insert 2 may be fixed in the pocket 12 by clamping the insert 2 between the bottom surface 121 and the clamper 3.

[0020] The first hole 13 may extend from the bottom surface 121 at a certain angle relative to the first central axis L1 of the holder 1. "Forming a certain angle relative to the first central axis L1" means that the second central axis L2 of the first hole 13 is not parallel to the first central axis L1 of the holder 1. For example, the second central axis L2 may be perpendicular to the first central axis L1. The first hole 13 may pass through the head 17 in the X-axis direction, or may have a bottom without passing through the head 17.

[0021] The second hole 14 may extend from the front end surface 11 toward the rear end 1b. In the example shown in FIG. 7, the second hole 14 extends from the front end surface 11 to the first hole 13 and further extends from the first hole 13 toward the rear end 1b. A screw groove 15 is provided in the portion extending further from the first hole 13 toward the rear end 1b. The screw groove 15 is provided concentrically with a third central axis L3 of the second hole 14. The third central axis L3 of the second hole 14 may have a certain angle with respect to the first central axis L1 of the holder 1, or may extend parallel to it. If the third central axis L3 of the second hole 14 extends parallel to the first central axis L1 of the holder 1, the insert 2 can be replaced more easily.

[0022] The second hole 14 may be perpendicular to the first hole 13 or may intersect at an acute angle with the first hole 13. That is, the third central axis L3 of the second hole 14 may be perpendicular to the second central axis L2 of the first hole 13 or may intersect at an acute angle with the second central axis L2.

[0023] <insert> The insert 2 positioned in the pocket 12 is not limited to a specific shape. The insert 2 may be in the form of a rectangular plate. When the insert 2 is in the form of a rectangular plate, it may have, for example, an upper surface 21, a lower surface 22, a pair of lateral surfaces 23, a first through hole 24, a notch 25, a front surface 26, a rear surface 27, and a cutting edge 28.

[0024] The upper surface 21 may be a surface located at the top of the insert 2. The lower surface 22 may be a surface located at the bottom of the insert 2. The pair of lateral side surfaces 23 may be surfaces located between the upper surface 21 and the lower surface 22. If the one of the pair of lateral side surfaces 23 located on the right side is referred to as a right surface 23a and the one of the pair of lateral side surfaces 23 located on the left side is referred to as a left surface 23b, the left surface 23b abuts against the bottom surface 121. The upper surface 21, the lower surface 22, and the pair of lateral side surfaces 23 may each extend in a direction along the first central axis L1.

[0025] The front side surface 26 is a surface located on the side of the tip 1a of the insert 2, and may protrude forward from the tip 1a in the cutting tool 100. The rear side surface 27 is a surface located on the side of the rear end 1b of the insert 2.

[0026] The first through hole 24 may be open in each of the pair of lateral side surfaces 23. In other words, the first through hole 24 may extend from the right side surface 23a to the left side surface 23b. In this case, the first through hole 24 may be open in the center portion of each of the pair of lateral side surfaces 23. The clamper 3 is inserted into the first through hole 24.

[0027] The cutout portion 25 may be formed in the right side surface 23a so as to recess toward the left side surface 23b. In the example shown in Fig. 2, the cutout portion 25 is connected to the first through hole 24 and is formed so as to extend from the edge of the first through hole 24 on the rear end 1b side toward the rear end 1b. When the clamper 3 has a protrusion 32 described below, the cutout portion 25 has a rectangular hole shape that follows the shape of the protrusion 32. The first cutout portion 25 may not be connected to the first through hole 24 and may be separated from the first through hole 24.

[0028] 2, the insert 2 may be point-symmetric with respect to the fourth central axis L4 of the first through hole 24. For example, the insert 2 has a shape such that when the insert 2 is rotated 180° with respect to the fourth central axis L4 of the first through hole 24, the upper surface 21 coincides with the lower surface 22.

[0029] The cutting edge 28 may be located at the intersection of the upper surface 21 and the front surface 26. Cutting can be performed by bringing this cutting edge 28 into contact with the workpiece. In addition to the above locations, the cutting edge 28 may also be located at the intersection of the lower surface 22 and the rear surface 27. In this case, the insert 2 is called a two-corner type, and is highly economical.

[0030] The size of the insert 2 is not particularly limited. For example, the length in the direction along the first central axis L1 can be set to approximately 10 mm to 30 mm. The height from the upper surface 21 to the lower surface 22, in other words, the width in the vertical direction, can be set to approximately 5 mm to 15 mm. The width between the pair of lateral surfaces 23 can be set to approximately 2 mm to 10 mm.

[0031] Examples of the material of the insert 2 include cemented carbide and cermet. Examples of the cemented carbide composition include WC-Co, WC-TiC-Co, and WC-TiC-TaC-Co. Here, WC, TiC, and TaC may be hard particles, and Co may be a binder phase.

[0032] The cermet may also be a sintered composite material in which a ceramic component is combined with a metal. An example of a cermet is a titanium compound mainly composed of titanium carbide (TiC) or titanium nitride (TiN). The material of the insert 2 is not limited to the above composition.

[0033] The surface of the insert 2 may be coated with a coating formed by chemical vapor deposition (CVD) or physical vapor deposition (PVD), and the coating composition may include titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), alumina (Al2O3), and the like.

[0034] <Clamper> The clamper 3 may be inserted into a first hole 13 provided in the holder 1. The clamper 3 may be capable of restraining the insert 2 and may be used to fix the position of the insert 2 relative to the holder 1. For example, the position of the insert 2 may be fixed by applying a pressing force from the clamper 3 to the insert 2 against the bottom surface 121 of the pocket 12.

[0035] 7, the position of the insert 2 may be fixed with the clamper 3 inserted into the first through-hole 24. Specifically, a part of the clamper 3 may be abutted against the vicinity of the opening of the first through-hole 24 on the right side surface 23a, and another part of the clamper 3 may be inserted into the first through-hole 24.

[0036] The other portion of the clamper 3 inserted into the first through hole 24 may be inserted into the first hole 13. The other portion of the clamper 3 inserted into the first through hole 24 is referred to as a first portion. When the screw 4 described below is tightened, the first portion is pulled into the first hole 13, and this allows the clamper 3 to apply a force to the insert 2 pressing it against the bottom surface 121 of the pocket 12.

[0037] The fixation of the insert 2 by the clamper 3 is not limited to the above configuration. For example, the location on the insert 2 where the clamper 3 abuts is not limited to the vicinity of the opening of the first through-hole 24 on the right side surface 23a. The location on the insert 2 where the clamper 3 abuts may be the vicinity of the outer peripheral edge of the right side surface 23a. For example, if the insert 2 does not have the first through-hole 24, the clamper 3 may be inserted into the first hole 13 by wrapping around any one of the upper side surface 21, lower side surface 22, front side surface 26, or rear side surface 27 of the insert 2 while abutting against the right side surface 23a.

[0038] The clamper 3 may abut against the insert 2 on the rear end 1b side of the first hole 13. For example, when the clamper 3 abuts against the right side surface 23a, the clamper 3 may abut against an area of ​​the right side surface 23a that is located on the rear end 1b side of the first hole 13. In this case, the insert 2 is pulled toward the rear end 1b, and the restraining force of the insert 2 can be increased.

[0039] The clamper 3 may have a second through hole 33. The second through hole 33 may be provided in a portion of the clamper 3 that is inserted into the first hole 13. The second through hole 33 may open to face the second hole 14 when the clamper 3 is inserted into the first hole 13. That is, the second through hole 33 and the second hole 14 form a single hole into which a screw 4 (described later) is inserted. In the example shown in FIGS. 2 and 7 , the second through hole 33 has a circular shape that is larger than the outer diameter of the body of the screw 4, and is in a state where the clamper 3 has only been inserted into the first hole 13, in other words, a state before the screw 4 is tightened. The fifth central axis L5 of the second through hole 33 is located closer to the opening of the first hole 13 than the third central axis L3 of the second hole 14.

[0040] 7 and 8, the second through hole 33 may have a first tapered surface 34 located at the opening leading to the second hole 14. In the example shown in Fig. 7, the second through hole 33 has the first tapered surface 34 as a portion where the inner diameter gradually decreases from the opening of the second through hole 33 toward the center of the second through hole 33.

[0041] Second through hole 33 does not necessarily have to be circular, and may have an elongated hole shape that is long in the X-axis direction. In this case, the arc-shaped portion of second through hole 33 on the side opposite to the opening of first hole 13 may have a portion (first tapered surface) where the inner diameter of the arc gradually decreases from the opening of second through hole 33 toward the center of second through hole 33.

[0042] The clamper 3 is not limited to a particular shape, but may be configured to slide in the direction in which the second central axis L2 of the first hole 13 extends, but not around the second central axis L2 of the first hole 13. This configuration makes it easy to align the opening of the second through hole 33 of the clamper 3 with the second hole 14 of the holder 1. This makes it easy to insert the screw 4 into the second hole 14 and the second through hole 33, making it easier to replace the insert 2.

[0043] As an example, as shown in FIG. 2, the clamper 3 may have an L-shape consisting of two sides. One of the two sides is referred to as a first side and the other as a second side. In this case, the clamper 3 has a shaft portion 31 as the first side, which is the first portion, and a protrusion 32 protruding from the end of the shaft portion 31 and the second through-hole 33 as the second side. The second through-hole 33 is located near the tip of the shaft portion 31 and penetrates the shaft portion 31. The diameter of the second through-hole 33 is smaller than the diameter of the first hole 13. As shown in FIGS. 2 and 4, the protrusion 32 may have a shape in which, for example, a small rectangle and a large rectangle are connected together in a side view. The protrusion 32 may abut against the right side surface 23a of the insert 2. If the right side surface 23a of the insert 2 has a cutout 25, the large rectangular portion of the protrusion 32 may fit into the cutout 25 to abut against the right side surface 23a. The shaft portion 31 is inserted into the first through-hole 24 and the first hole 13. In this case, the contact area between the insert 2 and the clamper 3 can be increased, and therefore the insert 2 can be firmly fixed by the clamper 3.

[0044] As another example, the first portion of the clamper 3 to be inserted into the first hole 13 and the first hole 13 may each have a non-circular shape when viewed in a cross section perpendicular to the second central axis L2. Even with this configuration, the clamper 3 is less likely to slide, or in other words, rotate, around the second central axis L2. Examples of non-circular shapes include a flattened circle, such as an ellipse, and a polygonal shape.

[0045] When the first portion has a non-circular shape in a cross section perpendicular to the second central axis L2, the first portion in this cross section may have an elongated shape in a direction perpendicular to the central axis of the holder 1. For example, this corresponds to the case where the clamper 3 has a shaft portion 31. In this case, it is easy to increase the diameter of the second through hole 33 that opens toward the second hole 14 while ensuring the thickness of the first portion around the second through hole 33. This can therefore improve the durability of the clamper 3 and the screw 4.

[0046] 2 and 4, the portion of the clamper 3 that is inserted into the first hole 13 may have a second cutout portion 35 that extends parallel to the second central axis L2, and the first hole 13 may have a protrusion 16 that corresponds to the second cutout portion 35. In this case, the clamper 3 is also less likely to rotate around the second central axis L2.

[0047] The material of the clamper 3 may be, for example, steel, cast iron, etc. In particular, when steel is used among these materials, the clamper 3 has high toughness.

[0048] <Screw> The screw 4 may be inserted into the second hole 14 and the second through hole 33. As shown in Figures 7 and 8, the screw 4 may have a thread 42 that is screwed into the second hole 14, and a second tapered surface 41. The screw 4 may have the second tapered surface 41 as a portion where the outer diameter decreases from the head to the tip. The second tapered surface 41 may extend up to the tip of the screw 4, or may be located in a portion away from the tip of the screw 4.

[0049] When the screw 4 is inserted into the second hole 14 from the tip surface 11 of the holder 1, the second tapered surface 41 of the screw 4 abuts against the first tapered surface 34 located at the opening of the second through hole 33 of the clamper 3. As described above, the fifth central axis L5 of the second through hole 33 is located closer to the opening of the first hole 13 than the third central axis L3 of the second hole 14. Therefore, as shown in FIG. 7 , the second tapered surface 41 may abut against the first tapered surface 34 only on the side opposite to the opening of the first hole 13.

[0050] When the screw 4 is tightened, it moves in the direction A. As this movement occurs, the second tapered surface 41 slides on the first tapered surface 34, and a pushing force acts on the first tapered surface 34 in the direction B, causing the clamper 3 to move to the side opposite the opening of the first hole 13 and be pulled into the first hole 13. This causes the convex portion 32 of the clamper 3 to press the first cutout portion 25, pressing the insert 2 toward the bottom surface 121 of the pocket 12. When the screw 4 is tightened into the second hole 14, the first tapered surface 34 and the second tapered surface 41 can be maintained in contact with each other.

[0051] As described above, the position of the insert 2 relative to the holder 1 is firmly fixed by the clamper 3. Then, the screw 4 can be easily loosened from the opening of the second hole 14 located on the side of the tip 1a, thereby releasing the restraint of the insert 2 by the clamper 3 and allowing the insert 2 to be replaced. For example, when performing machining with multiple cutting tools 100 arranged on a comb-tooth tool post, the spacing between the heads 17 is narrow, making it difficult to rotate the locking members on the sides. However, with the above configuration, the screw 4 can be easily loosened from the front side of the heads 17 to release the lock on the clamper 3.

[0052] The screw groove 15 may be formed in a portion closer to the opening of the second hole 14 than the second through hole 33, or may be formed in a portion farther from the opening of the second hole 14 than the second through hole 33, as described above.

[0053] In other words, the thread 42 may be located closer to the front end 1a than the second tapered surface 41, or may be located closer to the rear end 1b than the second tapered surface 41. When the thread 42 is located closer to the rear end 1b than the second tapered surface 41, the screw 4 is less likely to loosen.

[0054] Furthermore, when the thread 42 is located closer to the rear end 1b than the second tapered surface 41, the outer diameter of the second tapered surface 41 may be larger than the outer diameter of the thread 42. In this case, the area of ​​the second tapered surface 41 can be increased, and the contact area between the screw 4 and the clamper 3 can be increased. Therefore, the screw 4 is less likely to loosen.

[0055] 7, when the first hole 13 extends from the bottom surface 121 toward the first central axis L1 of the holder 1 and the second hole 14 extends from the tip surface 11 toward the rear end 1b of the holder 1, the clamper 3 can be firmly fixed. In addition, the screw 4 can be easily loosened to replace the insert 2.

[0056] Specifically, while the direction in which the insert 2 is clamped is the extension direction of the first hole 13, the extension directions of the first hole 13 and the second hole 14 are not parallel to each other but intersect, making it difficult for the screw 4 to loosen. In addition, the second hole 14 extends from the tip surface 11 of the holder 1 toward the rear end 1b, making it easy for the worker to visually recognize and turn the screw 4 when replacing the insert 2, making the replacement work easy.

[0057] The screw 4 may be made of a material such as steel or cast iron. In particular, when steel is used among these materials, the screw 4 has high toughness.

[0058] <Method of manufacturing machined products> Next, a non-limiting method for manufacturing a one-sided machined product according to the present disclosure will be described with reference to the drawings.

[0059] The machined product 101 is produced by cutting a workpiece 103. The manufacturing method of the machined product 101 in this embodiment includes the following steps: (1) rotating the workpiece 103; (2) bringing a cutting tool 100, such as the one typified by the above-described embodiment, into contact with a rotating workpiece 103; (3) removing the cutting tool 100 from the workpiece 103; Equipped with.

[0060] More specifically, first, as shown in Fig. 9, the workpiece 103 may be rotated around the sixth central axis L6, and the cutting tool 100 may be brought relatively close to the workpiece 103. Next, as shown in Fig. 10, at least a portion of the cutting edge 28 of the cutting tool 100 may be brought into contact with the workpiece 103 to cut the workpiece 103. Then, as shown in Fig. 11, the cutting tool 100 may be moved relatively away from the workpiece 103 or the machined object 101.

[0061] As shown in FIG. 9, the cutting tool 100 may be moved forward along the Y axis while the sixth center axis L6 is fixed and the workpiece 103 is rotated, thereby bringing the cutting tool 100 closer to the workpiece 103.

[0062] Also, as shown in Figure 10, the workpiece 103 may be cut by moving the cutting tool 100 forward along the Y axis while at least a portion of the portion of the insert 2 used as the cutting edge 28 is in contact with the rotating workpiece 103.

[0063] 11, the cutting tool 100 may be moved rearward along the Y axis while the workpiece 103 is being rotated, thereby moving the cutting tool 100 away from the workpiece 103.

[0064] In each step, the cutting tool 100 is moved to bring the cutting tool 100 into contact with the workpiece 103 or to move the cutting tool 100 away from the workpiece 103, but this is not limited to this case.

[0065] For example, in step (1), the workpiece 103 may be brought closer to the cutting tool 100. In step (3), the workpiece 103 may be moved away from the cutting tool 100. When continuing the cutting process, the workpiece 103 may be kept rotating, and the step of bringing at least a part of the cutting edge 28 of the insert 2 into contact with different locations on the workpiece 103 may be repeated.

[0066] Typical examples of the material of the workpiece 103 include hardened steel, carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.

[0067] According to the manufacturing method of the machined product of the present disclosure, the insert 2 is securely fixed to the holder 1 by the cutting tool 100 of the present disclosure, allowing for accurate machining. When replacing the insert 2, the screw 4 can be easily loosened from the front of the holder 1 to unlock the clamper 3, resulting in good work efficiency. [Explanation of symbols]

[0068] 1. Holder 1a...1st end (tip) 1b...2nd end (rear end) 11... Tip surface 12 pockets 13···1st hole 14...2nd hole 15···Thread groove 16...protrusion 17···head 18···Shank 2. Cutting insert (insert) 22 Bottom 21...Top side 22...Bottom side 23... Lateral side (23a, 23b) 24...First through hole 25 First notch 26 Front side 27...posterior side 28···Cutting edge 3. Clamper 31...shaft (first part) 32. Convex part 33 Second through hole 34... First tapered surface 35 Second notch 4 screws 41... Second tapered surface 42....Thread 100...cutting tools 101...Cutting workpiece 103...Work material L1...1st central axis L2...Second central axis L3...Third central axis L4...4th center axis L5...5th center axis L6...6th center axis

Claims

1. It has a rod shape extending along a central axis from the front end to the rear end, a tip surface located on the tip side; a pocket having a bottom surface parallel to the central axis and located on the tip side; a first hole extending from the bottom surface in a direction intersecting the central axis; a second hole extending from the tip surface toward the rear end and connected to the first hole; a holder having an insert located in the pocket; a clamper capable of restraining the insert, the clamper being inserted into the first hole and having a through hole opening toward the second hole; a screw inserted into the second hole and the through hole, the through hole has a first tapered surface located at an opening facing the second hole; the screw has a second tapered surface that abuts against the first tapered surface; By tightening the screw, the second tapered surface slides relative to the first tapered surface, and the clamper can be pulled into the first hole, the clamper abuts against the insert closer to the rear end than the first hole and is spaced apart from the insert closer to the front end than the first hole; the first tapered surface is located on the tip side of the through hole, and a cutting tool, wherein the through hole has a long hole shape that is long along the direction in which the clamper is inserted into the first hole, and the first tapered surface is provided in an arc-shaped portion of the first hole on the side opposite to the side in which the clamper is inserted.

2. The cutting tool according to claim 1 , wherein a central axis of the second hole extends parallel to the central axis of the holder.

3. The cutting tool according to claim 1 or 2, wherein the clamper slides in a direction in which the central axis of the first hole extends, but does not slide around the central axis of the first hole.

4. the insert has a notch in a portion that abuts against the clamper, The cutting tool according to claim 3 , wherein the clamper has a protrusion that engages with the notch.

5. the clamper has a first portion inserted into the first hole, The cutting tool according to claim 3 , wherein the first portion has an elliptical or polygonal shape in a cross section perpendicular to the central axis of the first hole.

6. The cutting tool according to claim 5 , wherein in a cross section of the first hole perpendicular to the central axis, the first portion has an elongated shape extending in a direction perpendicular to the central axis of the holder.

7. the threads of the screw are located closer to the rear end than the second tapered surface; The cutting tool according to claim 1 or 2, wherein the screw thread is fastened to the second hole.

8. The cutting tool according to claim 7 , wherein an outer diameter of the second tapered surface is greater than an outer diameter of the thread.

9. rotating the workpiece; a step of bringing the cutting tool according to claim 1 or 2 into contact with the rotating workpiece; and removing the cutting tool from the workpiece.

Images