Cutting tool and method for manufacturing machined product

Abstract

The cutting tool of the present disclosure includes a main body extending along a central axis, a cutting portion attached to the tip side of the main body, and a fixing member for fixing the cutting portion to the main body. The main body includes an adjustment screw. The cutting portion includes a cutting edge located on the tip side, a slit located on the rear end side relative to the cutting edge and the adjusting screw and open in the circumferential direction of the main body, and a fixing hole located on the rear end side relative to the slit and having the fixing member inserted therethrough. When an urging force is applied to the cutting portion from the adjustment screw, the cutting portion is elastically deformed at the slit.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Japanese Patent Application No. 2021-193807, filed on November 30, 2021, the entire disclosure of which is incorporated herein by reference. [Technical Field]

[0002] The present disclosure relates to a cutting tool that can be used for enlarging the inner diameter of a machined hole in a workpiece such as a metal, or for finishing to improve the surface precision of a machined surface. [Background technology]

[0003] A turning tool described in U.S. Patent Application Publication No. 2015 / 0306672 (Patent Document 1) is known as a cutting tool used to cut workpieces such as metals. The turning tool described in Patent Document 1 includes a cutting insert holder having a cutting edge and an adjustment screw having an angled face. In the turning tool described in Patent Document 1, the angled face is brought into contact with the holder, allowing fine adjustment of the radial position of the cutting edge.

[0004] In the turning tool described in Patent Document 1, it is possible to finely adjust the position of the cutting edge toward the outer periphery, but it is not possible to finely adjust the position of the cutting edge toward the inner periphery, which results in poor work efficiency in adjusting the cutting edge position (cutting edge position). Summary of the Invention

[0005] A non-limiting one-sided cutting tool of the present disclosure includes a cylindrical main body extending from a rear end to a tip end along a central axis, a cutting part attached to the main body on the tip side, and a fixing member fixing the cutting part to the main body. The main body has an adjustment screw capable of applying a biasing force toward the outer periphery of the cutting part to adjust the position of the cutting part in the radial direction. The cutting part has a cutting edge located on the tip side, a slit located closer to the rear end than the cutting edge and the adjustment screw and opening in the circumferential direction of the main body, and a fixing hole located closer to the rear end than the slit and into which the fixing member is inserted. When the biasing force is applied from the adjustment screw, the cutting part elastically deforms at the slit, thereby changing the position of the cutting part in the radial direction. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a perspective view of a non-limiting one-sided cutting tool of the present disclosure. [Figure 2] FIG. 2 is a plan view of the cutting tool shown in FIG. 1 as viewed from the tip side. [Figure 3] FIG. 3 is a side view of the cutting tool shown in FIG. 2 as viewed from the A1 direction. [Figure 4] FIG. 3 is a side view of the cutting tool shown in FIG. 2 as viewed from the A2 direction. [Figure 5] 2 is a perspective view showing a main body (first cartridge), a cutting part, a fixing member, etc. of the cutting tool shown in FIG. 1. FIG. [Figure 6] FIG. 6 is an exploded perspective view of the members shown in FIG. 5. [Figure 7] 6 is a plan view of the member shown in FIG. 5 as seen from the tip end side, with the second fixing member omitted. FIG. [Figure 8] FIG. 8 is a top view of the member shown in FIG. 7 as seen from the A3 direction. [Figure 9] FIG. 8 is a side view of the member shown in FIG. 7 as seen from the A4 direction. [Figure 10] FIG. 8 is a side view of the member shown in FIG. 7 as viewed from the A5 direction. [Figure 11]8 is a plan view of a cutting portion and an adjusting screw in the member shown in FIG. 7. [Figure 12] FIG. 2 is a perspective view of a cutting portion of the cutting tool shown in FIG. [Figure 13] 13 is a plan view of the cutting part shown in FIG. 12 as viewed from the tip side. FIG. [Figure 14] FIG. 14 is a top view of the cutting portion shown in FIG. 13 as viewed from the A6 direction. [Figure 15] 15 is a schematic diagram showing elastic deformation in the cutting portion shown in FIG. 14. FIG. [Figure 16] 14 is a side view of the cutting part shown in FIG. 13 as viewed from the A7 direction. [Figure 17] 14 is a bottom view of the cutting portion shown in FIG. 13 as viewed from the A8 direction. [Figure 18] 14 is a side view of the cutting part shown in FIG. 13 as viewed from the A9 direction. [Figure 19] 1 is a schematic diagram showing a step in a non-limiting method of manufacturing a one-sided machined product according to the present disclosure. [Figure 20] 1 is a schematic diagram showing a step in a non-limiting method of manufacturing a one-sided machined product according to the present disclosure. [Figure 21] 1 is a schematic diagram showing a step in a non-limiting method of manufacturing a one-sided machined product according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0007] <Cutting tools> A non-limiting embodiment of the cutting tool 1 of the present disclosure will be described in detail below with reference to the drawings. However, for the sake of convenience, the drawings below show only the main components necessary for explaining the embodiment in a simplified form. Therefore, the cutting tool 1 may include optional components not shown in the drawings. Furthermore, the dimensions of the components in the drawings do not faithfully represent the actual dimensions of the components or the dimensional ratios of the components.

[0008] In a non-limiting aspect, a rotary tool can be shown as an example of the cutting tool 1. However, the cutting tool 1 is not limited to a rotary tool and may be, for example, a turning tool used in turning.

[0009] The cutting tool 1 may have a main body portion 3, a cutting portion 5, and a fixing member 7, as shown in a non-limiting example in FIGS.

[0010] The main body 3 may have a cylindrical shape. The cylindrical shape may be roughly cylindrical, but does not necessarily have to be cylindrical in the strict sense. The main body 3 may extend from the rear end 3a to the front end 3b along the central axis O1.

[0011] When the cutting tool 1 is a rotary tool, the main body 3 is rotatable around a central axis O1. In this case, the central axis O1 may be referred to as a rotation axis O1. Note that the arrow Y1 in FIG. 1 and other figures may indicate the rotation direction of the central axis O1, or may indicate the rotation direction of the main body 3 around the central axis O1.

[0012] The size of the main body 3 is not limited to a specific value. For example, the length of the main body 3 in the direction along the central axis O1 may be set to approximately 100 to 200 mm. Furthermore, the width (diameter) of the main body 3 in the direction perpendicular to the central axis O1 may be set to approximately 30 to 200 mm.

[0013] The main body 3 may be formed of one member or may be formed of multiple members. For example, as a non-limiting example shown in FIG. 1 , the main body 3 may have a holder 9 and a cartridge 11 attached to the holder 9 on the side of the tip 3b. The holder 9 may have a cylindrical shape extending in a direction along the central axis O1. The cartridge 11 may be located on the outer periphery of the holder 9. The cartridge 11 may have a plate shape extending in a direction along the central axis O1.

[0014] Examples of materials for the holder 9 include steel and cast iron. When the material for the holder 9 is steel, the toughness of the holder 9 is high. Examples of materials for the cartridge 11 include steel and cast iron.

[0015] The cutting part 5 may be attached to the tip 3b side of the main body 3. When the main body 3 has a cartridge 11, the cutting part 5 may be attached to the cartridge 11. The cutting part 5 can play a major role in cutting the workpiece. The cutting part 5 may be located on the outer periphery of the main body 3. The cutting part 5 may be in the shape of a plate extending in a direction along the central axis O1.

[0016] The fixing member 7 may be a member that fixes the cutting portion 5 to the main body portion 3. The fixing member 7 may be rod-shaped. Examples of the fixing member 7 include pins and screws.

[0017] The main body 3 may have an adjustment screw 13, as shown in a non-limiting example in FIGS. 5 to 11. The adjustment screw 13 is capable of applying a biasing force F toward the outer periphery of the cutting portion 5 in order to adjust the position of the cutting portion 5 in the radial direction Y2 of the main body 3 (see FIGS. 1 and 11). The main body 3 may have a threaded hole into which the adjustment screw 13 is inserted. This threaded hole may be located in the cartridge 11.

[0018] The cutting portion 5 may have a cutting blade 15, a slit 17, and a fixing hole 19, as in the non-limiting example shown in FIGS.

[0019] The cutting edge 15 may be located on the side of the tip 3b. The cutting tool 1 is capable of performing cutting by bringing the cutting edge 15 into contact with a workpiece.

[0020] The slit 17 may be located closer to the rear end 3a than the cutting blade 15 and the adjusting screw 13. The slit 17 may open in the circumferential direction Y3 of the main body 3 (see FIGS. 1 and 12). When the cutting portion 5 has the slit 17, the cutting portion 5 is elastically deformable around the slit 17. When the cutting tool 1 is a rotary tool, the slit 17 may open in front and rear in the rotational direction Y1. The slit 17 may penetrate the cutting portion 5 in the thickness direction.

[0021] The fixing hole 19 may be located closer to the rear end 3a than the slit 17. The fixing member 7 may be inserted into the fixing hole 19.

[0022] When the cutting portion 5 has a cutting edge 15, a slit 17, and a fixing hole 19, the rear end 3a side of the cutting portion 5 is fixed by a fixing member 7 inserted into the fixing hole 19, while the tip 3b side (cutting edge) of the cutting portion 5 is able to slide in the radial direction Y2 by the slit 17.

[0023] When the biasing force F is applied from the adjusting screw 13, the cutting tool 1 elastically deforms the cutting portion 5 at the slit 17, thereby changing the position of the cutting edge 15 in the radial direction Y2 (see FIGS. 1, 11, and 12). The displacement of the cutting edge 15 in the radial direction Y2 may be denoted as δ (see FIG. 15). In this case, the cutting edge position in the radial direction Y2 changes due to the elastic deformation at the slit 17, making it easy to adjust the cutting edge position not only toward the outer periphery but also toward the inner periphery. Specifically, the biasing force F from the adjusting screw 13 can change the position of the cutting edge 15 toward the outer periphery by approximately δ. Furthermore, by loosening the biasing force F from the adjusting screw 13, the restoring force of the cutting portion 5 around the slit 17 can return the cutting edge 15 to the inner periphery. Therefore, the cutting tool 1 allows for efficient fine adjustment of the cutting edge position. The displacement δ can be set, for example, to 0.005 to 1 mm.

[0024] The adjusting screw 13 may have a tapered head 21, as shown in a non-limiting example in FIG. 11 . The tapered shape may refer to a shape in which the outer diameter increases toward the rear end 13a of the adjusting screw 13. The cutting portion 5 may have an inner surface 23 that abuts against the head 21 of the adjusting screw 13. When the adjusting screw 13 is turned, the tapered head 21 of the adjusting screw 13 abuts against the inner surface 23 of the cutting portion 5, making it possible to apply a biasing force F toward the outer periphery of the cutting portion 5. When applying the biasing force F, the adjusting screw 13 may be turned in a tightening direction. Furthermore, by turning the adjusting screw 13 in the opposite direction, the cutting edge position can be easily returned to the inner periphery. Therefore, even if the cutting edge protrudes too far toward the outer periphery, the cutting edge position can be easily corrected.

[0025] 5 and 6, the fixed member 7 may have a first fixed member 25 and a second fixed member 27. The first fixed member 25 may extend in the circumferential direction Y3. When the cutting tool 1 is a rotary tool, the first fixed member 25 may extend from the front to the rear in the rotational direction Y1. The second fixed member 27 may be located closer to the rear end 3a than the first fixed member 25.

[0026] 6, the fixing hole 19 may have a first fixing hole 29 and a second fixing hole 31. A first fixing member 25 may be inserted into the first fixing hole 29. A second fixing member 27 may be inserted into the second fixing hole 31. In these cases, it is easy to prevent the cutting edge position from shifting due to the entire cutting part 5 rotating around the first fixing hole 29.

[0027] The first fixing member 25 can function as a member that fixes the relative positions of the main body portion 3 (cartridge 11) and the cutting portion 5. In other words, the first fixing member 25 can function as a member that positions the cutting portion 5 relative to the main body portion 3 (cartridge 11). The first fixing member 25 may be a positioning pin.

[0028] The second fixing member 27 can function as a member for fixing the cartridge 11 and the cutting portion 5 to the holder 9. The second fixing member 27 may be a fixing screw.

[0029] The second fixing member 27 may be inserted from the outer periphery toward the inner periphery (see FIG. 1). In this case, it is easier to prevent the cutting edge position from shifting due to the entire cutting part 5 rotating around the first fixing hole 29. Note that the inner periphery side refers to the side opposite to the outer periphery side, the side away from the outer periphery of the main body 3, and may also refer to the direction generally approaching the central axis O1 (rotation axis O1).

[0030] As a non-limiting example shown in FIG. 12 , the slit 17 may have a first slit 33 and a second slit 35. The first slit 33 may extend in the radial direction Y2. The second slit 35 may extend in a direction along the central axis O1. In these cases, elastic deformation in the slit 17 is easily ensured. The second slit 35 may be connected to the first slit 33. When the second slit 35 is connected to the first slit 33, the entire slit 17 is easily elastically deformed.

[0031] The cutting portion 5 may further have a first side surface 37 and a second side surface 39. The first side surface 37 may be located on the inner periphery side. The second side surface 39 may be located on the outer periphery side. The first slit 33 may be spaced apart from the first side surface 37 and the second side surface 39. In these cases, it is easy to avoid excessive deformation loads being applied to the vicinity of the slit 17. Therefore, the durability of the cutting portion 5 is high.

[0032] The first side surface 37 may be the inner side surface 23 described above. That is, the first side surface 37 may abut against the head 21 of the adjusting screw 13. The second side surface 39 may be located on the opposite side of the first side surface 37.

[0033] The second slits 35 may be a pair. That is, the slit 17 may have a pair of second slits 35. The distance D1 between the pair of second slits 35 and the first side surface 37 and the distance D2 between the pair of second slits 35 and the second side surface 39 may be the same as or different from the distance D3 between the pair of second slits 35.

[0034] For example, as in a non-limiting example shown in Fig. 14, the distance D1 and the distance D2 may be smaller than the distance D3. In this case, the thickness of the cutting portion 5 in the radial direction Y2 is ensured, and the amount of elastic deformation at the slit 17 tends to increase.

[0035] The distance D2 between the pair of second slits 35 and the second side surface 39 may be the same as or different from the distance D1 between the pair of second slits 35 and the first side surface 37. For example, as in a non-limiting example shown in FIG. 14, the distance D2 may be greater than the distance D1. In this case, the durability of the cutting portion 5 is further increased. The area sandwiched between the second slits 35 and the first side surface 37, indicated by the distance D1, can be held by the area sandwiched between the pair of second slits 35, indicated by the distance D3, when elastically deformed. On the other hand, the area sandwiched between the second slits 35 and the second side surface 39, indicated by the distance D2, is less likely to be held by the area sandwiched between the pair of second slits 35, indicated by the distance D3, when elastically deformed.

[0036] Therefore, when the cutting portion 5 undergoes large elastic deformation due to the application of a large biasing force F, a large cutting load may be concentrated in the area between the second slit 35 and the second side surface 39, indicated by the distance D2. However, if the distance D2 is larger than the distance D1, the strength of the area between the second slit 35 and the second side surface 39, indicated by the distance D2, may be increased. This makes it easier to further increase the durability of the cutting portion 5 while reducing the size of the cutting portion 5 in the radial direction Y2. Note that the distances D1 and D2 may be evaluated using their respective minimum values. The distance D1 may be set to, for example, 1 to 2.8 mm. The distance D2 may be set to, for example, 1.2 to 3 mm. The distance D3 may be set to, for example, 8 to 15 mm.

[0037] The width W2 of the second slit 35 may be the same as or different from the width W1 of the first slit 33. For example, as shown in a non-limiting example in FIG. 14, the width W2 of the second slit 35 may be smaller than the width W1 of the first slit 33. In this case, it is easy to avoid the thickness of the cutting portion 5 in the radial direction Y2 from being extremely narrow. Note that, when the cutting tool 1 is a rotary tool, the above-described configuration may be evaluated in a plan view from the front in the rotational direction Y1. The width W1 of the first slit 33 may be set to, for example, 0.5 to 2 mm. The width W2 of the second slit 35 may be set to, for example, 0.1 to 1 mm. The width W2 of the second slit 35 corresponds to the maximum value of the displacement amount δ. For example, when the width W2 is 0.5 mm, the maximum value of the displacement amount δ is also 0.5 mm.

[0038] 12, the cutting portion 5 may further have an upper surface 41 and a groove 43. The groove 43 may be provided on the upper surface 41. The groove 43 may open to the first slit 33.

[0039] 6, the main body 3 may further have a through hole 45. The through hole 45 may be connected to the groove 43. The through hole 45 may function as a grease supply port that supplies grease to the groove 43.

[0040] When the cutting part 5 has the upper surface 41 and the groove 43 and the main body part 3 has the through-hole 45, it is possible to supply grease to the groove 43. This makes it easy to adjust the cutting edge position in the radial direction Y2. Also, wear of the slit 17 is easily suppressed. Grease is easily supplied to the slit 17.

[0041] The upper surface 41 is a convenient expression and does not indicate an upward direction. That is, the upper surface 41 does not need to face upward when the cutting tool 1 is used. The upper surface 41 may also be located between the first side surface 37 and the second side surface 39. The upper surface 41 may also be connected to the first side surface 37 and the second side surface 39. When the cutting tool 1 is a rotary tool, the upper surface 41 may be located forward in the rotation direction Y1. In this case, the upper surface 41 may also be referred to as the front surface 41.

[0042] The cutting tool 1 may have a tubular threaded fastener 101, as shown in a non-limiting example in FIG. 6 . The threaded fastener 101 may also be called a nipple. When grease is supplied from the outside to the through-hole 45, the grease may be supplied by connecting a hose to the through-hole 45. In this case, the threaded fastener 101 may be used to connect the hose to the through-hole 45. Examples of materials for the threaded fastener 101 include metals such as steel, aluminum, and copper.

[0043] The length L2 of the second slit 35 may be the same as or different from the length L1 of the first slit 33. For example, as shown in a non-limiting example in FIG. 14, the length L2 of the second slit 35 may be greater than the length L1 of the first slit 33. In this case, elastic deformation in the slit 17 is more likely to be ensured. Note that when the cutting tool 1 is a rotary tool, the above-described configuration may be evaluated in a plan view from the front in the rotation direction Y1. The length L1 of the first slit may be set to, for example, 9 to 16 mm. The length L2 of the second slit may be set to, for example, 12 to 20 mm.

[0044] The main body 3 may have a recess 47, as shown in a non-limiting example in FIG. 6 . The recess 47 may be located on the side of the tip 3b. The recess 47 may be open toward the outer periphery. When the main body 3 has a cartridge 11, the recess 47 may be located in the cartridge 11.

[0045] The cutting portion 5 may be attached to the recess 47 so that at least the slit 17 is located inside the recess 47. In these cases, chips generated during cutting of the workpiece are likely to be prevented from entering the slit 17. Therefore, the slit 17 is less likely to be damaged.

[0046] As a non-limiting example shown in Figures 17 and 18, the cutting portion 5 may further have a lower surface 49 and a recess 51 in addition to the first side surface 37. The recess 51 may be open at the first side surface 37 and the lower surface 49. The recess 51 may be connected to the slit 17. The recess 51 may be connected to at least the first slit 33. The recess 51 may function as a grease reservoir.

[0047] When the cutting part 5 has the first side surface 37, the lower surface 49, and the recess 51, it is possible to store grease in the recess 51. This makes it easy to adjust the cutting edge position in the radial direction Y2. Also, wear of the slit 17 is easily suppressed. Grease is easily supplied to the slit 17.

[0048] The lower surface 49 is a convenient expression and does not indicate a downward direction. That is, the lower surface 49 does not need to face downward when the cutting tool 1 is used. The lower surface 49 may also be located on the opposite side of the upper surface 41. The lower surface 49 may also be located between the first side surface 37 and the second side surface 39. The lower surface 49 may also be connected to the first side surface 37 and the second side surface 39.

[0049] The cutting portion 5 may have a cartridge 53 and a cutting insert 55 attached to the cartridge 53 on the side of the tip 3b, as a non-limiting example shown in FIG.

[0050] The cartridge 53 may have a slit 17 and a fixing hole 19. The cartridge 53 may also have an inner surface 23, etc. The cartridge 53 may have a plate shape extending in a direction along the central axis O1. Note that when the main body 3 has the above-mentioned cartridge 11, the cartridge 11 in the main body 3 may be referred to as the first cartridge 11, and the cartridge 53 in the cutting unit 5 may be referred to as the second cartridge 53.

[0051] The cutting insert 55 may have a cutting edge 15. The cutting insert 55 may have a polygonal plate shape. The cutting insert 55 can be used to cut a workpiece in a cutting process. The cutting insert 55 may also be simply referred to as an insert 55.

[0052] The insert 55 may have a through hole 57. The second cartridge 53 may have a threaded hole at a position corresponding to the through hole 57 of the insert 55. The cutting unit 5 may have an insert fixing screw 59. The insert 55 can be fixed to the second cartridge 53 by inserting the insert fixing screw 59 into the through hole 57 of the insert 55 and fixing the insert fixing screw 59 to the threaded hole of the second cartridge 53. The insert 55 may be attached to the second cartridge 53 so that at least a portion of the cutting blade 15 protrudes from the second cartridge 53. Note that the member for fixing the insert 55 is not limited to a screw and may be, for example, a clamp member or the like.

[0053] The material of the second cartridge 53 may include, for example, steel and cast iron.

[0054] Examples of materials for the insert 55 include cemented carbide and cermet. Examples of cemented carbide compositions 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.

[0055] The cermet may be a sintered composite material in which a ceramic component is combined with a metal. An example of a cermet is a titanium compound primarily composed of titanium carbide (TiC) or titanium nitride (TiN). It goes without saying that the material of the insert 55 is not limited to the above composition.

[0056] The surface of the insert 55 may be coated with a coating using a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method, and the coating composition may include, for example, titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), and alumina (Al2O3).

[0057] 5 and 6, the main body 3 may further include an adjustment screw 61 in addition to the adjustment screw 13. In this case, the adjustment screw 13 may be referred to as the first adjustment screw 13, and the adjustment screw 61 may be referred to as the second adjustment screw 61.

[0058] While the first adjusting screw 13 is used to adjust the position of the cutting edge in the radial direction Y2, the second adjusting screw 61 may be used to adjust the position of the cutting edge in the axial direction Y4 (see FIG. 1). When the main body 3 has the second adjusting screw 61, the first cartridge 11 and the cutting part 5 can slide in the axial direction Y4 around the second fixing hole 31 into which the second fixing member 27 is inserted.

[0059] The second adjusting screw 61 may be located closer to the rear end 3a than the cutting unit 5. The second adjusting screw 61 may have a tapered head 63, as shown in a non-limiting example in FIG. 6 . The first cartridge 11 may have a rear end surface 65 that abuts against the head 63 of the second adjusting screw 61. When the second adjusting screw 61 is turned with the second fixing member 27 temporarily fastened, the tapered head 63 of the second adjusting screw 61 abuts against the rear end surface 65 of the first cartridge 11, and the first cartridge 11 and the cutting unit 5 can slide along the central axis O1. The main body 3 may have a threaded hole into which the second adjusting screw 61 is inserted.

[0060] <Method of manufacturing machined products> Next, a non-limiting method for manufacturing the one-surface machined product 201 according to the present disclosure will be described with reference to FIGS.

[0061] The machined product 201 may be produced by cutting a workpiece 203. A manufacturing method for the machined product 201 may include the following steps: (1) rotating a cutting tool 1, such as the one typified by the non-limiting embodiment described above, along a central axis O1; (2) bringing the cutting tool 1 into contact with the workpiece 203; (3) a step of separating the cutting tool 1 from the workpiece 203; may have

[0062] Specifically, first, as shown in a non-limiting example in Fig. 19, the cutting tool 1 may be rotated in the Y1 direction along the central axis O1 and brought relatively close to the workpiece 203. Next, as shown in a non-limiting example in Fig. 20, the cutting edge 15 of the cutting portion 5 may be brought into contact with the workpiece 203 to cut the workpiece 203. Then, as shown in a non-limiting example in Fig. 21, the cutting tool 1 may be moved relatively away from the workpiece 203.

[0063] By going through the above steps, it is possible to obtain a machined product 201 with a highly accurate finished surface. Specifically, in the manufacturing method of the machined product 201, when the cutting tool 1 is used, it is easy to fine-tune the cutting edge position, and therefore it is possible to exhibit excellent workability. As a result, it is possible to obtain a machined product 201 with a highly accurate finished surface.

[0064] In the non-limiting example shown in FIGS. 19 to 21, the workpiece 203 is fixed and the cutting tool 1 is moved in each step, but the present invention is not limited to this configuration.

[0065] For example, in step (1), the workpiece 203 may be brought closer to the cutting tool 1. Similarly, in step (3), the workpiece 203 may be moved away from the cutting tool 1. When continuing the cutting process, the cutting tool 1 may be kept rotating, and the step of bringing the cutting edge 15 of the cutting portion 5 into contact with different locations on the workpiece 203 may be repeated.

[0066] Examples of the material of the workpiece 203 include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals. [Explanation of symbols]

[0067] 1. Cutting tools (rotary tools) 3. Main body 3a...rear end 3b...Tip 5...Cutting part 7. Fixing member 9 Holder 11 Cartridge (1st cartridge) 13. Adjustment screw (first adjustment screw) 13a...rear end 15···Cutting edge 17. Slit 19...Fixing hole 21...Head 23 Inner surface 25... First fixing member 27 Second fixing member 29...1st fixing hole 31...Second fixing hole 33 First slit 35...Second slit 37...1st side 39...Second side 41...Top surface 43...Groove 45...Through hole 47 Recess 49...Bottom surface 51. Depression 53 Cartridge (Second Cartridge) 55···Cutting insert (insert) 57...Through hole 59 Insert fixing screw 61 Adjustment screw (second adjustment screw) 63...Head 65...Rear end surface 101···Threaded parts (nipples) 201...Cutting workpiece 203...Work material O1: Central axis (rotation axis) Y1: Rotation direction Y2: Radial direction Y3...Circumferential direction Y4: Axial direction F...Forcing force

Claims

1. a cylindrical main body extending from a rear end to a front end along a central axis; a cutting portion attached to the tip side of the main body portion; a fixing member that fixes the cutting portion to the main body portion, the main body portion has an adjustment screw capable of applying a biasing force toward an outer periphery of the cutting portion in order to adjust the position of the cutting portion in a radial direction, The cutting portion is A cutting edge located on the tip side; a slit located closer to the rear end than the cutting blade and the adjusting screw and opening in the circumferential direction of the main body; a fixing hole, the fixing hole being located closer to the rear end than the slit and into which the fixing member is inserted; When the biasing force is applied from the adjustment screw, the cutting portion is elastically deformed at the slit, thereby changing the position of the cutting blade in the radial direction, The fixing member is a first fixing member extending in the circumferential direction; a second fixing member located closer to the rear end than the first fixing member, The fixing hole is a first fixing hole into which the first fixing member is inserted; a second fixing hole into which the second fixing member is inserted, the second fixing member is inserted from the outer circumferential side toward the inner circumferential side, The first fixing hole is positioned offset toward the inner periphery of the cutting portion.

2. a cylindrical main body extending from a rear end to a front end along a central axis; a cutting portion attached to the tip side of the main body portion; a fixing member that fixes the cutting portion to the main body portion, the main body portion has an adjustment screw capable of applying a biasing force toward an outer periphery of the cutting portion in order to adjust the position of the cutting portion in a radial direction, The cutting portion is A cutting edge located on the tip side; a slit located closer to the rear end than the cutting blade and the adjusting screw and opening in the circumferential direction of the main body; a fixing hole, the fixing hole being located closer to the rear end than the slit and into which the fixing member is inserted; When the biasing force is applied from the adjustment screw, the cutting portion is elastically deformed at the slit, thereby changing the position of the cutting blade in the radial direction, The slit is a first slit extending in the radial direction; a second slit extending in a direction along the central axis, The cutting portion is The top surface and a groove provided on the upper surface and opening to the first slit; The cutting tool, wherein the body portion further has a through hole connected to the groove.

3. The cutting portion is a first side surface located on the inner circumferential side; a second side surface located on the outer periphery side, The cutting tool of claim 2 , wherein the first slit is spaced apart from each of the first side and the second side.

4. The slit has a pair of the second slits, The cutting tool according to claim 3 , wherein a distance between the pair of second slits and the first side surface and a distance between the pair of second slits and the second side surface are smaller than a distance between the pair of second slits.

5. The cutting tool according to claim 2 , wherein the width of the second slit is smaller than the width of the first slit.

6. The cutting tool according to claim 2 , wherein the length of the second slit is greater than the length of the first slit.

7. a cylindrical main body extending from a rear end to a front end along a central axis; a cutting portion attached to the tip side of the main body portion; a fixing member that fixes the cutting portion to the main body portion, the main body portion has an adjustment screw capable of applying a biasing force toward an outer periphery of the cutting portion in order to adjust the position of the cutting portion in a radial direction, The cutting portion is A cutting edge located on the tip side; a slit located closer to the rear end than the cutting blade and the adjusting screw and opening in the circumferential direction of the main body; a fixing hole, the fixing hole being located closer to the rear end than the slit and into which the fixing member is inserted; When the biasing force is applied from the adjustment screw, the cutting portion is elastically deformed at the slit, thereby changing the position of the cutting blade in the radial direction, The cutting portion is a first side surface located on the inner circumferential side; The underside and a recess that opens in the first side surface and the lower surface and is connected to the slit.

8. The fixing member is a first fixing member extending in the circumferential direction; a second fixing member located closer to the rear end than the first fixing member, The fixing hole is a first fixing hole into which the first fixing member is inserted; The cutting tool according to claim 7 , further comprising: a second fixing hole into which the second fixing member is inserted.

9. The cutting tool according to claim 8 , wherein the second fixing member is inserted from the outer circumferential side toward the inner circumferential side.

10. the main body portion has a recess located on the tip side and opening toward the outer periphery side, The cutting tool according to claim 1 , 2 or 7 , wherein the cutting portion is attached to the recessed portion such that at least the slit is located within the recessed portion.

11. a step of rotating the cutting tool according to claim 1, 2 or 7 along the central axis; contacting the cutting tool with a workpiece; and removing the cutting tool from the workpiece.

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