Cutting implement and method for manufacturing cut workpiece

Abstract

A cutting implement according to a non-limiting aspect of the present disclosure comprises: a rod-shaped body portion extending from a rear end toward a tip along the axis of rotation; a cutting portion; a fixing member for fixing the cutting portion to the body portion; and an adjustment screw capable of applying a biasing force in the outer circumference with respect to the cutting portion in order to adjust the position of the cutting portion in the radial direction of the body portion. The cutting portion has a fixing hole that is positioned closer to the rear end side than a cutting blade and into which the fixing member is inserted, and slits open in an upper surface, a lower surface, and an inner side surface. The opening of the slits in the inner side surface is positioned between the cutting blade and the fixing hole in the direction along the rotation axis. The slit passes from the opening through a position circumferentially further out than the fixing hole and extends further towards the rear end side than the fixing hole.

Description

Cutting tool and method for manufacturing machined product CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Japanese Patent Application No. 2024-042108, filed on March 18, 2024, the entire disclosure of which is incorporated herein by reference.

[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.

[0003] A known cutting tool used in cutting workpieces such as metals is disclosed in, for example, Chinese Patent Application Publication No. 106735363 (Patent Document 1). The cutting tool described in Patent Document 1 has a holding member having a cutting edge and a slit. The holding member is fixed to a body with a fixing screw. The holding member has the slit, which allows elastic deformation, and this elastic deformation allows fine adjustment of the position of the cutting edge. The slit in Patent Document 1 is V-shaped when viewed from above, and is formed so that the bottom end of the V is closest to the cutting edge.

[0004] In the cutting tool described in Patent Document 1, the retaining member may rotate around the fixing screw rather than due to elastic deformation of the slit. That is, the position of the cutting edge may change due to the rotation of the retaining member rather than the elastic deformation of the slit. In such a case, while it is possible to fine-tune the position of the cutting edge toward the outer periphery, it is not possible to fine-tune the position of the cutting edge toward the inner periphery. As a result, the efficiency of adjusting the cutting edge position (cutting edge position) is poor.

[0005] The non-limiting one-sided cutting tool of the present disclosure has a rod-shaped main body extending from the rear end to the tip along a rotation axis, a cutting part attached to the tip side of the main body, a fixing member that fixes the cutting part to the main body, and an adjustment screw that can apply a biasing force toward the outer periphery of the cutting part to adjust the position of the cutting part in the radial direction of the main body.

[0006] The cutting portion has an upper surface located forward in the rotation direction of the rotating shaft, a lower surface located opposite the upper surface, an inner surface located between the upper surface and the lower surface, a cutting edge located on the tip side, a fixing hole located on the rear end side of the cutting edge and into which the fixing member is inserted, and slits opening on the upper surface, the lower surface, and the inner surface, respectively.

[0007] An opening in the inner surface of the slit is located between the cutting edge and the fixing hole in the direction along the rotation axis, and the slit extends from the opening, passing on the outer circumferential side of the fixing hole and toward the rear end side of the fixing hole.

[0008] 1 is a perspective view showing one non-limiting cutting tool of the present disclosure; FIG. 1 is an enlarged view of region II shown in FIG. 1; FIG. 1 is a plan view of the cutting tool shown in FIG. 1 as seen from the tip side, with an adjustment screw and the like seen through; FIG. 3 is a side view of the cutting tool shown in FIG. 3 as seen from direction IV; FIG. 4 is an enlarged view of region V shown in FIG. 4; FIG. 5 is the same enlarged view as FIG. 5, with a slit and the like seen through; FIG. 3 is a side view of the cutting tool shown in FIG. 3 as seen from direction VII; FIG. 7 is an enlarged view of region VIII shown in FIG. 7; FIG. 10 is a perspective view showing a cutting portion, a fixing member, and the like of the cutting tool shown in FIG. 1; FIG. 9 is an exploded perspective view of the member shown in FIG. 9; FIG. 11 is a plan view of the member shown in FIG. 9 as seen from the rear end side; FIG. 12 is a top view of the member shown in FIG. 11 as seen from direction XII; FIG. 13 is the same top view as FIG. 12, with an adjustment screw and the like seen through; FIG. 14 is a bottom view of the member shown in FIG. 11 as seen from direction XIV; FIG. 15 is a side view of the member shown in FIG. 11 as seen from direction XV; FIG. 16 is a side view of the member shown in FIG. 11 as seen from direction XVI. FIG. 17 is a view showing a modified example of the cutting tool shown in FIG. 3; 1 is a schematic diagram showing a process in a method for manufacturing a machined product having a single surface, which is not limited to the present disclosure; FIG. 2 is a schematic diagram showing a process in a method for manufacturing a machined product having a single surface, which is not limited to the present disclosure; FIG. 3 is a schematic diagram showing a process in a method for manufacturing a machined product having a single surface, which is not limited to the present disclosure;

[0009] <Cutting Tool> A non-limiting aspect 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 referred to below show only the main components necessary for explaining the embodiment in a simplified form. Therefore, the cutting tool 1 may include any components not shown in the drawings referred to. Furthermore, the dimensions of the components in the drawings do not faithfully represent the actual dimensions of the components and the dimensional ratios of the components.

[0010] 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. In this case, the rotation axis O1 described below may be referred to as the central axis O1.

[0011] The cutting tool 1 may have a body portion 3, a cutting portion 5, a fixing member 7, and an adjustment screw 9, as a non-limiting example shown in FIGS.

[0012] The main body 3 may be rod-shaped and extend from a rear end 3 a to a front end 3 b along the rotation axis O1. For example, the main body 3 may be cylindrical. The cylindrical shape may be roughly cylindrical, and does not necessarily have to be cylindrical in the strict sense.

[0013] The main body 3 is rotatable around a rotation axis O1. Note that the arrow Y1 in Fig. 1 and other figures may indicate the rotation direction of the rotation axis O1, or may indicate the rotation direction of the main body 3 around the rotation axis O1.

[0014] 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 Y2 along the rotation axis O1 may be set to approximately 100 to 200 mm. The width (diameter) of the main body 3 in the direction Y3 perpendicular to the rotation axis O1 may be set to approximately 20 to 200 mm.

[0015] Examples of materials that can be used for the main body 3 include steel and cast iron. When the main body 3 is made of steel, the main body 3 has high toughness.

[0016] The cutting portion 5 may be attached to the tip 3b side of the main body portion 3. The cutting portion 5 can function as a portion that plays a major role in cutting a workpiece. The cutting portion 5 may be located on the outer periphery of the main body portion 3. The cutting portion 5 may be in the shape of a plate extending in the direction Y2 along the rotation axis O1.

[0017] 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 screws.

[0018] 3, the adjustment screw 9 can apply 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 Y4 of the main body 3. Here, the radial direction Y4 refers to the direction from the rotation axis O1 toward the outer periphery of the main body 3, and is perpendicular to the rotation direction Y1 of the rotation axis O1.

[0019] The main body 3 may have a first screw hole 11. A member for moving the adjustment screw 9 may be inserted into the first screw hole 11 in the non-limiting example shown in FIG. 3 . This member may include, for example, a wrench. The cutting unit 5 may also have a second screw hole 13. In the non-limiting example shown in FIG. 3 , the adjustment screw 9 may be inserted into the second screw hole 13 in addition to the above member.

[0020] The first screw hole 11 may penetrate the main body 3 in the radial direction Y4. The second screw hole 13 may penetrate the cutting portion 5 in the radial direction Y4. The second screw hole 13 may communicate with the first screw hole 11. The inner diameter of the second screw hole 13 may be larger than the inner diameter of the first screw hole 11. In other words, the outer diameter of the adjustment screw 9 may be larger than the inner diameter of the first screw hole 11.

[0021] For example, in the non-limiting example shown in Fig. 3, when moving the adjustment screw 9 from left to right, a wrench may be inserted into the first screw hole 11 and the adjustment screw 9 may be moved with this wrench. When moving the adjustment screw 9 from right to left, a wrench may be inserted into the second screw hole 13 and the adjustment screw 9 may be moved with this wrench. Only one of the first screw hole 11 and the second screw hole 13 may be provided as a screw hole for inserting a wrench, or both may be provided. Note that the hole into which only a member such as a wrench is inserted does not have to be a screw hole.

[0022] The cutting portion 5 may have an upper surface 15, a lower surface 17, an inner surface 19, a cutting edge 21, a fixing hole 23, and a slit 25, as a non-limiting example shown in FIGS.

[0023] The upper surface 15 may be located forward in the rotation direction Y1 of the rotation axis O1. The lower surface 17 may be located opposite the upper surface 15. Note that the upper surface 15 and the lower surface 17 are expressions for convenience and do not indicate an upward and downward direction. For example, the upper surface 15 does not need to face upward when the cutting tool 1 is used.

[0024] The inner surface 19 may be located between the upper surface 15 and the lower surface 17. The inner surface 19 may be connected to the upper surface 15 and the lower surface 17. The inner surface 19 may extend in a direction Y2 along the rotation axis O1. The inner surface 19 may be located on the side of the rotation axis O1.

[0025] The cutting edge 21 may be located on the side of the tip 3b. The cutting tool 1 is capable of performing cutting by bringing the cutting edge 21 into contact with the workpiece.

[0026] The fixing hole 23 may be located closer to the rear end 3 a than the cutting edge 21. The fixing member 7 may be inserted into the fixing hole 23. The fixing hole 23 may be open to the upper surface 15 and the lower surface 17, as in non-limiting examples shown in FIGS. 9 and 14 .

[0027] The slits 25 may be opened in the upper surface 15, the lower surface 17, and the inner surface 19, as in non-limiting examples shown in Figures 9, 14, and 15. When the cutting portion 5 has the slits 25, the cutting portion 5 can be elastically deformed around the slits 25.

[0028] 12, the opening 27 in the inner surface 19 of the slit 25 may be located between the cutting edge 21 and the fixing hole 23 in the direction Y2 along the rotation axis O1. The slit 25 may extend from the opening 27 to a position closer to the outer periphery of the fixing hole 23 and closer to the rear end 3a than the fixing hole 23.

[0029] When the cutting portion 5 has a cutting edge 21, a fixing hole 23, and a slit 25, the rear end 3a side of the cutting portion 5 is fixed by a fixing member 7 inserted into the fixing hole 23, while the tip 3b side (cutting edge) of the cutting portion 5 is able to slide in the radial direction Y4 by the slit 25.

[0030] When a spring force F is applied from the adjustment screw 9, the cutting tool 1 is capable of changing the position of the cutting edge 21 in the radial direction Y4 by elastically deforming the cutting portion 5 at the slit 25 (see Figures 3 and 13).

[0031] In a non-limiting example shown in Fig. 3 , a screw groove corresponding to the thread of the adjustment screw 9 is provided in the second screw hole 13. Furthermore, the adjustment screw 9 can abut against a portion T1 of the main body 3. In other words, in the non-limiting example shown in Fig. 3 , the cutting portion 5 has a second screw hole 13 as a screw hole into which the adjustment screw 9 is inserted. This second screw hole 13 extends in the radial direction Y4 of the main body 3 and has a screw groove corresponding to the thread of the adjustment screw 9. Furthermore, the main body 3 has a portion T1 that faces the second screw hole 13 in the radial direction Y4 and against which the adjustment screw 9 can abut. The portion T1 may be located so as to surround the opening of the first screw hole 11.

[0032] When the adjustment screw 9 is moved from the right side to the left side and a part of the adjustment screw 9 protrudes from the second screw hole 13 toward the main body 3, the adjustment screw 9 can press the main body 3 at the position T1. The second screw hole 13 positions the adjustment screw 9 relative to the cutting portion 5, and the adjustment screw 9 presses the main body 3 at the position T1, causing the adjustment screw 9 to apply a biasing force F to the cutting portion 5. This makes it possible to adjust the position of the cutting portion 5 toward the right in the radial direction Y4 of the main body 3.

[0033] Furthermore, when the adjusting screw 9 is moved from left to right while the biasing force F is being applied to the cutting portion 5 from the adjusting screw 9, the amount of deformation of the cutting portion 5 that has elastically deformed in the slit 25 decreases. Therefore, it is possible to adjust the position of the cutting portion 5 toward the left, in the opposite direction to the above. Therefore, the cutting tool 1 has good work efficiency in adjusting the cutting edge position (cutting edge position).

[0034] In addition, because the position of the cutting part 5 is adjusted by elastically deforming the cutting part 5 at the slit 25, unlike Patent Document 1, the amount of deformation of the cutting part 5 is likely to be secured even if the position of the fixed member 7 in the direction Y2 along the rotation axis O1 is moved closer to the tip 3b. This makes it difficult for the cutting part 5 to rotate around the fixed member 7, making it easy to adjust the cutting edge position (cutting edge position).

[0035] In the non-limiting example shown in FIG. 13, the adjusting screw 9 can apply a biasing force F to the cutting portion 5 on the side of the tip 3 b from the opening 27 of the slit 25 .

[0036] The slit 25 may have a first portion 29, a second portion 31, and a third portion 33. As a non-limiting example shown in FIG. 12 , the first portion 29, the second portion 31, and the third portion 33 may have the following configuration when viewed from the front of the top surface 15.

[0037] The first portion 29 may have a linear shape extending from the opening 27 toward the outer periphery. The second portion 31 may have a curved shape extending from the first portion 29 toward the rear end 3 a. The third portion 33 may have a linear shape extending from the second portion 31 toward the rear end 3 a. The second portion 31 may be connected to the first portion 29. The third portion 33 may be connected to the second portion 31.

[0038] When the slit 25 has the first portion 29 and the third portion 33, it is easy to ensure the length of the slit 25 even if the cutting portion 5 has a narrow width. In addition, when the slit 25 has the second portion 31, it is easy to suppress the concentration of stress that occurs due to the elastic deformation of the slit 25 in the second portion 31.

[0039] The first portion 29 may extend from the opening 27 toward the rear end 3 a, as in a non-limiting example shown in Fig. 13. In other words, the first portion 29 may extend so as to approach the rear end 3 a as it moves away from the opening 27. For ease of visual understanding, the direction in which the first portion 29 extends is indicated by an arrow in Fig. 13.

[0040] When the first portion 29 extends as described above, the thickness of the cutting portion 5 between the slit 25 and the cutting edge 21 is easily ensured. Therefore, the durability of the cutting portion 5 is easily improved.

[0041] The third portion 33 may extend from the second portion 31 toward the outer periphery, as in a non-limiting example shown in Fig. 13. In other words, the third portion 33 may extend so as to move away from the rotation axis O1 (inner surface 19) as it moves away from the second portion 31. For ease of visual understanding, the direction in which the third portion 33 extends is indicated by an arrow in Fig. 13.

[0042] When the third portion 33 extends as described above, the cutting portion 5 is likely to be elastically deformed. Therefore, the amount of deformation of the cutting portion 5 is likely to be ensured.

[0043] 12 , the first portion 29 may be located closer to the tip 3 b than the fixing hole 23. More specifically, the entire first portion 29 may be located closer to the tip 3 b than the fixing hole 23. In this case, the thickness of the cutting portion 5 between the fixing hole 23 and the first portion 29 is likely to be ensured. Therefore, the durability of the cutting portion 5 is likely to be improved.

[0044] As shown in a non-limiting example in Fig. 12, the third portion 33 may be located more radially outward than the fixing hole 23. More specifically, the entire third portion 33 may be located more radially outward than the fixing hole 23. In this case, the thickness of the cutting portion 5 between the fixing hole 23 and the third portion 33 is likely to be ensured. Therefore, the durability of the cutting portion 5 is likely to be improved.

[0045] In the direction Y2 along the rotation axis O1, the distance D1 between the first portion 29 and the cutting edge 21 may be the same as or different from the distance D2 between the first portion 29 and the fixing hole 23. For example, as in a non-limiting example shown in Figure 12, the distance D1 may be greater than the distance D2. In this case, the durability of the cutting portion 5 is high.

[0046] The distances D1 and D2 may be evaluated using their minimum values. Furthermore, the distances D1 and D2 are not limited to a specific size. For example, the distance D1 may be set to approximately 7 to 12 mm. The distance D2 may be set to approximately 0.5 to 2 mm.

[0047] 12 , the slit 25 may further have a bottom 35. The bottom 35 may extend from the third portion 33 toward the rear end 3 a. The bottom 35 may be connected to the third portion 33.

[0048] 13 , in a front view of the upper surface 15, the width W35 of the bottom portion 35 in the direction Y3 perpendicular to the rotation axis O1 may be larger than the width W33 of the third portion 33 in the direction Y3 perpendicular to the rotation axis O1. In this case, stress generated by deformation of the slit 25 is less likely to concentrate on the bottom portion 35. Therefore, cracks originating from the bottom portion 35 are less likely to occur in the cutting portion 5.

[0049] The width W35 of the bottom portion 35 and the width W33 of the third portion 33 may be evaluated using their maximum values. The width W35 of the bottom portion 35 and the width W33 of the third portion 33 are not limited to a specific size. For example, the width W35 of the bottom portion 35 may be set to approximately 1.1 to 2 mm. The width W33 of the third portion 33 may be set to approximately 0.5 to 1.5 mm.

[0050] The bottom portion 35 may be located closer to the rear end 3 a than the fixing hole 23. More specifically, at least a portion of the bottom portion 35 may be located closer to the rear end 3 a than the fixing hole 23. In this case, rotation of the cutting portion 5 around the fixing member 7 is more likely to be suppressed. In particular, when the entire bottom portion 35 is located closer to the rear end 3 a than the fixing hole 23, as in the non-limiting example shown in FIG. 12 , rotation of the cutting portion 5 around the fixing member 7 is even more likely to be suppressed.

[0051] 12, the second portion 31 may be longer than the first portion 29 and the third portion 33. In this case, stress concentration on a portion of the second portion 31 is likely to be avoided.

[0052] The third portion 33 may be longer than the first portion 29. In this case, the length of the slit 25 is ensured to ensure the amount of elastic deformation of the cutting portion 5, while the cutting portion 5 can be easily made smaller.

[0053] The second portion 31 may have an arc shape when viewed from the front of the upper surface 15. In this case, as shown in a non-limiting example in FIG. 13 , the center O2 of the arc of the second portion 31 may be located on the fixing member 7. In this case, the curved structure of the second portion 31 can be made gentler. Therefore, the durability of the cutting portion 5 is likely to be improved.

[0054] 5, the fixing member 7 may overlap the rotation axis O1 in a front view of the upper surface 15. In this case, it is easy to ensure the thickness of the cutting portion 5 while miniaturizing the main body 3. This makes it easy to miniaturize the cutting tool 1 while improving the efficiency of adjusting the cutting edge position.

[0055] The main body 3 may have a recess 37, as shown in a non-limiting example in Figures 2 and 3. The recess 37 may be located on the side of the tip 3b. The recess 37 may open toward the outer periphery. The cutting part 5 may be attached to the recess 37 so that at least the slit 25 is located within the recess 37 (see Figure 6). In these cases, chips generated during cutting of the workpiece are likely to be prevented from entering the slit 25. Therefore, the slit 25 is less likely to be damaged. The above-mentioned portion T1 may be located at the bottom of the recess 37. The above-mentioned first screw hole 11 may also open at the bottom of the recess 37.

[0056] As a non-limiting example shown in FIGS. 9 and 10, the cutting portion 5 may have a cartridge 39 and a cutting insert 41 attached to the cartridge 39 on the side of the tip 3b.

[0057] The cartridge 39 may have a fixing hole 23 and a slit 25. The cartridge 39 may also have a plate shape extending in the direction Y2 along the rotation axis O1.

[0058] The cutting insert 41 may simply be referred to as the insert 41. The insert 41 may have a cutting edge 21. The insert 41 may have a polygonal plate shape. The insert 41 can be used to cut a workpiece in a cutting process.

[0059] The insert 41 may have a through hole 43, as shown in a non-limiting example in FIG. 10 . The cartridge 39 may have a third screw hole 45 at a position corresponding to the through hole 43 of the insert 41. The cutting portion 5 may have a screw 47. The insert 41 may be fixed to the cartridge 39 by inserting the screw 47 into the through hole 43 of the insert 41 and fixing the screw 47 to the third screw hole 45.

[0060] The insert 41 may be attached to the cartridge 39 so that at least a portion of the cutting edge 21 protrudes from the cartridge 39. Note that the member for fixing the insert 41 is not limited to a screw, and may be, for example, a clamp member or the like.

[0061] Materials for the cartridge 39 may include, for example, steel and cast iron.

[0062] Examples of the material of the insert 41 include cemented carbide and cermet. Examples of the composition of the cemented carbide 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.

[0063] The cermet may be a sintered composite material in which a ceramic component is combined with a metal. Specifically, the cermet may be a titanium compound primarily composed of titanium carbide (TiC) or titanium nitride (TiN). However, the above materials are merely examples, and the insert 41 is not limited to these materials.

[0064] The surface of the insert 41 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 (AlO).

[0065] 6 , the cutting tool 1 may further include an adjustment screw 49 in addition to the adjustment screw 9. In this case, the adjustment screw 9 may be referred to as the first adjustment screw 9, and the adjustment screw 49 may be referred to as the second adjustment screw 49.

[0066] While the first adjustment screw 9 is used to adjust the cutting edge position in the radial direction Y4, the second adjustment screw 49 may be used to adjust the cutting edge position in the direction Y2 (axial direction) along the rotation axis O1. When the cutting tool 1 has the second adjustment screw 49, the cutting part 5 can slide in the direction Y2 along the rotation axis O1 around the fixing hole 23 into which the fixing member 7 is inserted.

[0067] The second adjusting screw 49 may be located closer to the rear end 3 a than the fixing hole 23. The cutting portion 5 may have a threaded hole into which the second adjusting screw 49 is inserted. The fixing hole 23 may have an elliptical shape extending in the direction Y2 along the rotation axis O1 when viewed from the front of the upper surface 15 (see FIG. 12 ).

[0068] <Modifications> In a non-limiting example shown in Fig. 3 , a screw groove corresponding to the thread of the adjustment screw 9 is provided in the second screw hole 13. The adjustment screw 9 can abut against the portion T1 of the main body 3. The second screw hole 13 positions the adjustment screw 9 relative to the cutting portion 5, and the adjustment screw 9 presses the main body 3 at the portion T1, thereby applying a biasing force F from the adjustment screw 9 to the cutting portion 5. However, the cutting tool 1 of the present disclosure is not limited to this example and may have a configuration such as the example shown in Fig. 17 , for example.

[0069] In the non-limiting example shown in Fig. 17 , a screw groove corresponding to the thread of the adjustment screw 9 is provided in the first screw hole 11. Furthermore, the adjustment screw 9 can abut against the portion T2 of the cutting portion 5. In other words, in the non-limiting example shown in Fig. 17 , the main body 3 has the first screw hole 11 as a screw hole into which the adjustment screw 9 is inserted. This first screw hole 11 extends in the radial direction Y4 of the main body 3 and has a screw groove corresponding to the thread of the adjustment screw 9. Furthermore, the cutting portion 5 faces the first screw hole 11 in the radial direction Y4 and has a portion T2 with which the adjustment screw 9 can abut.

[0070] When the adjustment screw 9 is moved from the left side to the right side and a part of the adjustment screw 9 protrudes from the first screw hole 11 toward the cutting portion 5, the adjustment screw 9 can press the cutting portion 5 at the position T2. ​​The first screw hole 11 positions the adjustment screw 9 relative to the main body 3, and the adjustment screw 9 presses the cutting portion 5 at the position T2, causing the adjustment screw 9 to apply a biasing force F to the cutting portion 5. This makes it possible to adjust the position of the cutting portion 5 toward the right side in the radial direction Y4 of the main body 3.

[0071] 17 , the inner diameter of the first screw hole 11 is larger than the inner diameter of the second screw hole 13. In other words, the outer diameter of the adjustment screw 9 is larger than the inner diameter of the second screw hole 13. Furthermore, the portion T2 is positioned so as to surround the opening of the second screw hole 13.

[0072] <Method for Manufacturing Machined Product> Next, a non-limiting method for manufacturing the machined product 101 having one surface according to the present disclosure will be described with reference to the drawings.

[0073] The machined product 101 may be produced by cutting a workpiece 103. A manufacturing method for the machined product 101 may include the following steps: (1) a step of rotating a cutting tool 1 typified by the non-limiting embodiment described above; (2) a step of bringing the cutting tool 1 into contact with the workpiece 103; and (3) a step of separating the cutting tool 1 from the workpiece 103.

[0074] Specifically, first, as in a non-limiting example shown in Fig. 18 , the cutting tool 1 may be rotated around the rotation axis O1 and brought relatively close to the workpiece 103. Next, as in a non-limiting example shown in Fig. 19 , the cutting edge 21 of the cutting portion 5 may be brought into contact with the workpiece 103 to cut the workpiece 103. Then, as in a non-limiting example shown in Fig. 20 , the cutting tool 1 may be moved relatively away from the workpiece 103.

[0075] By going through the above steps, it is possible to obtain a machined product 101 having a highly accurate finished surface. Specifically, when the cutting tool 1 is used in the manufacturing method of the machined product 101, it is easy to adjust the cutting edge position (cutting edge position), and excellent workability can be exhibited. As a result, it is possible to obtain a machined product 101 having a highly accurate finished surface.

[0076] In the non-limiting example shown in FIGS. 18 to 20, the workpiece 103 is fixed and the cutting tool 1 is moved in each step, but the present invention is not limited to this configuration.

[0077] For example, in step (1), the workpiece 103 may be brought closer to the cutting tool 1. In step (3), the workpiece 103 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 tool 1 into contact with different locations of the workpiece 103 may be repeated.

[0078] Examples of the material of the workpiece 103 include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.

[0079] The above describes an example of a non-limiting one-sided cutting tool 1 and a method for manufacturing a machined product 101 according to the present disclosure. However, the present disclosure is not limited to the above-described embodiment, and it goes without saying that any method may be used as long as it does not deviate from the gist of the present disclosure.

[0080] For example, the manufacturing method of the cutting tool 1 and the machined product 101 may be configured as follows. [1] A cutting tool has a rod-shaped main body extending from a rear end to a tip end along a rotation axis, a cutting part attached to the tip side of the main body, a fixing member that fixes the cutting part to the main body, and an adjustment screw that can apply a biasing force toward the outer periphery of the cutting part to adjust the position of the cutting part in the radial direction of the main body, wherein the cutting part has an upper surface located forward in the rotation direction of the rotation axis, a lower surface located opposite the upper surface, an inner surface located between the upper surface and the lower surface, a cutting blade located on the tip side, a fixing hole located closer to the rear end than the cutting blade and into which the fixing member is inserted, and slits that open on the upper surface, the lower surface, and the inner surface, respectively, and an opening on the inner surface of the slit is located between the cutting blade and the fixing hole in the direction along the rotation axis, and the slit extends from the opening, passing closer to the outer periphery than the fixing hole and toward the rear end than the fixing hole. [2] In the cutting tool of [1] above, the slit may have, in a front view of the upper surface, a first portion having a linear shape extending from the opening toward the outer periphery, a second portion having a curved shape extending from the first portion toward the rear end, and a third portion having a linear shape extending from the second portion toward the rear end. [3] In the cutting tool of [2] above, the first portion may extend from the opening toward the rear end. [4] In the cutting tool of [2] or [3] above, the third portion may extend from the second portion toward the outer periphery. [5] In any one of the cutting tools of [2] to [4] above, the first portion may be located closer to the tip than the fixing hole. [6] In any one of the cutting tools of [2] to [5] above, the third portion may be located closer to the outer periphery than the fixing hole. [7] In any one of the cutting tools [2] to [6] above, the distance between the first portion and the cutting edge may be greater than the distance between the first portion and the fixing hole in the direction along the rotation axis.[8] In the cutting tool of any one of [2] to [7] above, the slit may further have a bottom extending from the third portion toward the rear end, and the width of the bottom in a direction perpendicular to the rotation axis in a front view of the top surface may be greater than the width of the third portion in a direction perpendicular to the rotation axis. [9] In the cutting tool of [8] above, the bottom may be located closer to the rear end than the fixing hole.

[10] In the cutting tool of any one of [2] to [9] above, the second portion may be longer than the first portion and the third portion.

[11] A method for manufacturing a machined product may include the steps of rotating the cutting tool of any one of [1] to

[10] above, bringing the cutting tool into contact with a workpiece, and separating the cutting tool from the workpiece.

[0081] DESCRIPTION OF SYMBOLS 1 Cutting tool (rotary tool) 3 Main body 3a Rear end 3b Tip 5 Cutting portion 7 Fixing member 9 Adjusting screw (first adjusting screw) 11 First screw hole 13 Second screw hole 15 Upper surface 17 Lower surface 19 Inner surface 21 Cutting edge 23 Fixing hole 25 Slit 27 Opening 29 First part 31 Second part 33 Third part 35 Bottom part 37 Recess 39 Cartridge 41 Cutting insert (insert) 43 Through hole 45 Third screw hole 47 Screw 49 Adjusting screw (second adjusting screw) 101 Cutting workpiece 103 Workpiece O1 Rotation axis O2 Center of arc in second part Y1 Rotation direction Y2 Direction along the rotation axis Y3 Direction perpendicular to the rotation axis Y4 Radial direction F...Forcing force T1...Part T2...Part

Claims

1. A cutting tool comprising: a rod-shaped main body extending from a rear end to a tip end along a rotation axis; a cutting part attached to the tip side of the main body; a fixing member for fixing the cutting part to the main body; and an adjustment screw capable of applying a biasing force toward the outer periphery of the cutting part in order to adjust the position of the cutting part in the radial direction of the main body, wherein the cutting part has: an upper surface located forward in the rotation direction of the rotation axis; a lower surface located opposite the upper surface; an inner surface located between the upper surface and the lower surface; a cutting blade located on the tip side; a fixing hole located closer to the rear end than the cutting blade and into which the fixing member is inserted; and slits opening into the upper surface, the lower surface, and the inner surface, wherein an opening in the inner surface of the slit is located between the cutting blade and the fixing hole in the direction along the rotation axis, and the slit extends from the opening, passing closer to the outer periphery than the fixing hole and towards the rear end than the fixing hole.

2. A cutting tool as described in claim 1, wherein the slit, when viewed from the front of the top surface, has: a first portion having a linear shape extending from the opening toward the outer periphery; a second portion having a curved shape extending from the first portion toward the rear end; and a third portion having a linear shape extending from the second portion toward the rear end.

3. The cutting tool according to claim 2, wherein said first portion extends from said opening toward said rear end.

4. A cutting tool according to claim 2 or 3, wherein the third portion extends from the second portion toward the outer periphery.

5. A cutting tool according to any one of claims 2 to 4, wherein the first portion is located closer to the tip than the fixing hole.

6. A cutting tool according to any one of claims 2 to 5, wherein the third portion is located on the outer periphery side of the fixing hole.

7. A cutting tool according to any one of claims 2 to 6, wherein the distance between the first portion and the cutting edge in the direction along the rotation axis is greater than the distance between the first portion and the fixing hole.

8. A cutting tool according to any one of claims 2 to 7, wherein the slit further has a bottom extending from the third portion toward the rear end, and the width of the bottom in a direction perpendicular to the rotation axis, as viewed from the front of the top surface, is greater than the width of the third portion in the direction perpendicular to the rotation axis.

9. The cutting tool according to claim 8, wherein the bottom portion is located closer to the rear end than the fixing hole.

10. A cutting tool according to any one of claims 2 to 9, wherein the second portion is longer than the first portion and the third portion.

11. A method for manufacturing a machined product, comprising the steps of: rotating a cutting tool according to any one of claims 1 to 10; bringing the cutting tool into contact with a workpiece; and separating the cutting tool from the workpiece.

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