Cutting tool and method for manufacturing machined product

Abstract

To solve the problem that a clamper is inclined and an insert cannot be accurately fixed.SOLUTION: The cutting tool includes a holder, an insert, a clamp member, and a fixing member. The holder has a bar shape and includes a front end surface, a pocket, a first side surface, a first hole, and a second hole. The clamp member includes a main body and a protrusion. The fixing member includes a shaft portion, a first head portion, and a second head portion. The second head portion is attachable to and detachable from the shaft portion.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention 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] BACKGROUND ART Conventionally, a lever-lock type clamping mechanism as described in Patent Document 1 has been used as an example of a method for fixing a cutting insert to a holder in an insert-type cutting tool.

[0003] The cutting tool described in Patent Document 1 has a structure in which a fixing member combining a clamp screw and a wedge is incorporated into a holder, and the clamp screw is rotated to operate a clamper and tighten or loosen the insert. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-139839 Summary of the Invention [Problem to be solved by the invention]

[0005] In the cutting tool described in Patent Document 1, the clamper is actuated by the fixing member pressing the end of the clamper. Therefore, there is a risk that the clamper may tilt when the insert is fixed. Therefore, there is a demand for a cutting tool that can fix the insert more stably. [Means for solving the problem]

[0006] A cutting tool according to one embodiment includes a rod-shaped holder extending from a front end to a rear end, the holder having a front end surface located on the front end side, a pocket located on the front end side, a first side surface extending from the front end surface toward the rear end and located on the opposite side of the pocket, a first hole extending from the front end surface toward the rear end along a first central axis, and a second hole extending from the first side surface to the first hole along a second central axis tilted relative to the first central axis, an insert located in the pocket, a clamping member inserted in the first hole, and a fixing member inserted in the second hole. The clamping member is inserted in the first hole and has a main body portion extending along the first central axis and having a through hole extending along the second central axis, and a protrusion extending from the main body portion toward the insert. The fixing member has a rod-shaped shaft portion that extends from a first end to a second end along the second central axis and is inserted into the through hole, a first head portion that is located closer to the first end than the shaft portion and has an outer diameter larger than the minimum inner diameter of the through hole, and a second head portion that is located closer to the second end than the shaft portion and has an outer diameter larger than the minimum inner diameter of the through hole. The second head portion is detachable from the shaft portion. [Effects of the Invention]

[0007] According to the cutting tool of the above aspect, the insert can be easily and stably fixed. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a non-limiting one-sided cutting tool of the present disclosure. [Figure 2] 2 is an enlarged view of an area A1 in FIG. 1, showing an exploded view of the cutting tool. [Figure 3] 3 is a view showing the holder and the insert in the enlarged view shown in FIG. 2. FIG. [Figure 4] FIG. 3 is a perspective view of the cutting tool shown in FIG. 2, as viewed from a direction B4. [Figure 5] FIG. 2 is a side view of the cutting tool shown in FIG. 1, as viewed from a direction B1. [Figure 6]FIG. 2 is a side view of the cutting tool shown in FIG. 1, as viewed from a direction B2. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 6. [Figure 8] FIG. 2 is a side view of the cutting tool shown in FIG. 1, as viewed from a direction B3. [Figure 9] FIG. 1 is a perspective view of a non-limiting one-sided clamping member of the present disclosure. [Figure 10] 10 is a side view of the clamp member shown in FIG. 9, viewed from the C1 direction. FIG. [Figure 11] 10 is a side view of the clamp member shown in FIG. 9, viewed from the C2 direction. [Figure 12] FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. 11. [Figure 13] 10 is a side view of the clamp member shown in FIG. 9, seen from the C3 direction. [Figure 14] FIG. 10 is a partial cross-sectional view of the clamp member shown in FIG. [Figure 15] FIG. 15 is a partial cross-sectional view of the clamper shown in FIG. 14, seen from another direction. [Figure 16] FIG. 1 is a side view of a non-limiting fixation member of the present disclosure. [Figure 17] FIG. 17 is an exploded side view of the fixing member shown in FIG. 16. [Figure 18] FIG. 1 is an exploded side view of a non-limiting one-sided fixation member of the present disclosure. [Figure 19] FIG. 1 is an exploded side view of a non-limiting one-sided fixation member of the present disclosure. [Figure 20] FIG. 1 is an exploded side view of a non-limiting one-sided fixation member of the present disclosure. [Figure 21] FIG. 1 is an exploded side view of a non-limiting one-sided fixation member of the present disclosure. [Figure 22] FIG. 1 is an exploded side view of a non-limiting one-sided fixation member of the present disclosure. [Figure 23] 10A and 10B are simplified diagrams illustrating a state in which a clamper is restrained by a fixing member in the present disclosure. [Figure 24] FIG. 2 is a schematic diagram showing a step in a non-limiting example method for manufacturing a machined product according to the present disclosure. [Figure 25] FIG. 2 is a schematic diagram showing a step in a non-limiting example method for manufacturing a machined product according to the present disclosure. [Figure 26] FIG. 2 is a schematic diagram showing a step in a non-limiting example method for manufacturing a machined product according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] The cutting tool 1 of the present disclosure will be described in detail below 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.

[0010] For ease of explanation, the drawings referred to below show only the main components necessary for explaining the cutting tool 1 of the embodiment in a simplified form. Therefore, the cutting tool 1 of the present disclosure 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. Note that the present invention is not limited to the following aspects.

[0011] <Cutting tools> As an example shown in FIGS. 1 and 2, the cutting tool 1 includes a holder 100, an insert 200, a clamping member 300, and a fixing member 400.

[0012] 1, 5, and 6, the holder 100 may be rod-shaped extending from a front end 100a to a rear end 100b. As shown in FIG. 1, the holder 100 may be rectangular prism-shaped.

[0013] Steel, cast iron, etc. may be used as the material of the holder 100. In particular, when steel is used among these materials, the toughness of the holder 100 is high.

[0014] As an example shown in FIGS. 1, 5 and 6, the holder 100 may have a head 101 and a shank 103. The head 101 is located on the tip 100a side of the holder 100. The shank 103 may be located closer to the rear end 100b than the head 101.

[0015] The shank 103 may be a portion that is held by a machine tool when the cutting tool 1 is attached to the machine tool. On the other hand, the head 101 is a portion for holding the insert 200, and has a pocket 107, which will be described later. The shank 103 generally has a simple cylindrical or prismatic shape.

[0016] As an example shown in FIGS. 2 to 4, the holder 100 may have a tip surface 105, a pocket 107, a side surface 109, a first hole 111, and a second hole 113.

[0017] The tip surface 105 may be located on the side of the tip 100a of the holder 100. In other words, the tip surface 105 may be located on the head 101. The tip surface 105 may be formed by one plane, or may be formed by multiple planes. In the example shown in Figures 1 to 4, the tip surface 105 is formed by multiple planes. Furthermore, the tip surface 105 may not be a plane, but may be formed by a curved surface.

[0018] As shown in the example in FIGS. 2 to 4, the pocket 107 may be located on the side of the tip 100a of the holder 100. In other words, the pocket 107 may be located in the head 101. In this case, the pocket 107 may be configured by cutting out the tip side of the head 101. The pocket 107 may be adjacent to the tip surface 105, or may extend from the tip surface 105 toward the rear end 100b. An insert 200 can be attached to the pocket 107.

[0019] 1 to 4, the side surface 109 may extend from the leading end surface 105 toward the rear end 100b. The side surface 109 may be composed of a plurality of flat surfaces. For example, as in the example shown in FIGS. 1 to 4, the side surface 109 may have an upper side surface 109a located on an upper side, a lower side surface 109b located on the opposite side of the upper side surface 109a, a first side surface 109c located on the opposite side of the pocket 107, and a second side surface 109d located on the same side as the pocket 107.

[0020] As shown in the example in Figures 2 and 7, the first hole 111 may extend from the tip surface 105 toward the rear end 100b along the first central axis L1. The first hole 111 may open at the tip surface 105. As will be described later, a clamp member 300 may be attached to the first hole 111. The first hole 111 may be parallel to the extension direction of the holder 100 or may be inclined. If the first hole 111 is parallel to the extension direction of the holder 100, the insert 200 can be easily replaced.

[0021] 2 and 7, the second hole 113 may extend along a second central axis L2 that is inclined relative to the first central axis L1. Alternatively, the second hole 113 may extend from the first side surface 109c through the first hole 111 to the pocket 107. In the example shown in FIGS. 1 to 4 and 8, the second hole 113 is open at the first side surface 109c. As will be described later, a fixing member 400 can be attached to the second hole 113.

[0022] The insert 200 positioned in the pocket 107 is not limited to a particular shape. As an example shown in Figures 2 to 4, the insert 200 may have a polygonal plate shape. The polygonal plate-shaped insert 200 may have an upper surface 201, a lower surface 203, a pair of lateral side surfaces 205, and a first through hole 207.

[0023] As an example shown in FIGS. 2 to 4, the upper surface 201 may be a surface located at the upper side of the insert 200. The lower surface 203 may be a surface located at the lower side of the insert 200. The pair of lateral side surfaces 205 may be located between the upper surface 201 and the lower surface 203. Of the pair of lateral side surfaces 205, the surface that abuts against the pocket 107 may be designated as a first lateral side surface 205a, and the surface that does not abut against the pocket 107 and is located on the opposite side of the first lateral side surface 205a may be designated as a second lateral side surface 205b.

[0024] 2 to 4, the first through hole 207 may be positioned so as to penetrate through the pair of lateral side surfaces 205. In other words, the first through hole 207 may be positioned from the first lateral side surface 205a to the second lateral side surface 205b. In this case, the first through hole 207 may be open in the center portion of each of the pair of lateral side surfaces 205. A clamp member 300 may be inserted into the first through hole 207.

[0025] The size of the insert 200 is not particularly limited. For example, the length along the first central axis L1 may be approximately 1 to 100 mm. The height from the upper surface 201 to the lower surface 203, in other words, the width in the vertical direction, may be approximately 1 to 100 mm. The width between the pair of lateral side surfaces 205 may be approximately 0.01 to 50 mm.

[0026] Examples of the material of the insert 200 include inorganic materials such as cemented carbide and cermet. Examples of the composition of cemented carbide include WC (tungsten carbide)-Co, WC-TiC (titanium carbide)-Co, and WC-TiC-TaC (tantalum carbide)-Co. Here, WC, TiC, and TaC may be hard particles, and Co may be a binder phase.

[0027] 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 compound mainly composed of TiC or titanium nitride (TiN). The material of the insert 200 is not limited to the above composition.

[0028] The surface of the insert 200 may be coated with a coating formed by using a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method, and the composition of the coating may include TiC, TiN, titanium carbonitride (TiCN), alumina (Al2O3), etc.

[0029] 3 and 7, the clamp member 300 may be inserted into the first hole 111 provided in the holder 100. The clamp member 300 can fix the insert 200 and may be used to position the insert 200 relative to the holder 100. For example, the position of the insert 200 may be fixed by applying a pressing force from the clamp member 300 to the insert 200 toward the pocket 109.

[0030] The clamp member 300 may be made of, for example, steel or cast iron. In particular, when steel is used among these materials, the clamp member 300 has high toughness.

[0031] 9 to 12, the clamp member 300 may have a main body portion 301 and a protrusion portion 303. The main body portion 301 may be inserted into the first hole 111 and extend along the first central axis L1. The protrusion portion 303 may extend from the main body portion 301 toward the insert 200 and be inserted into the first through-hole 207.

[0032] 9, 10, and 12, the clamp member 300 may be generally L-shaped, with the main body 301 and the protrusion 303 corresponding to two sides of the L. For example, in the example shown in Figures 9, 10, and 12, the main body 301 corresponds to the long side of the L, and the protrusion 303 protrudes from the end of the main body 301 and corresponds to the short side of the L.

[0033] As an example shown in FIGS. 9 and 11 to 13, the main body 301 has a second through hole 305. The second through hole 305 may simply be referred to as the through hole 305. The through hole 305 may extend along the second central axis L2. When the clamp member 300 is inserted into the first hole 111, the second hole 113 and the through hole 305 may overlap. As will be described later, the fixing member 400 can be attached to a hole where the second hole 113 and the through hole 305 overlap. In other words, the fixing member 400 may be inserted into the second hole 113 and the through hole 305.

[0034] 7, the fixing member 400 may be inserted into a second hole 113 provided in the holder 100. The fixing member 400 may extend from the first end 400a to the second end 400b along the second central axis L2.

[0035] For example, steel, stainless steel, etc. may be used as the material of the fixing member 400. In particular, when steel is used among these materials, the fixing member 400 has high toughness.

[0036] By moving the fixing member 400 in one direction along the second central axis L2 while it is inserted into the second hole 113, the fixing member 400 can move the main body 301 in a direction toward the rear end 100b. This causes the protrusion 303 to move in a direction toward the rear end 100b, pressing the insert 200 against the pocket 107 and fixing it.

[0037] Furthermore, by moving the fixing member 400 in one direction along the second central axis L2 opposite to the above, the fixing member 400 can move the main body portion 301 in a direction toward the tip 100a. This causes the protrusion 303 to move in a direction toward the tip 100a, and the insert 200 can be removed from the pocket 107.

[0038] 16 to 20, fixing member 400 may have a shaft portion 401, a first head portion 403, and a second head portion 405. Shank portion 401 may be inserted into through-hole 305. Shank portion 401 may also be rod-shaped.

[0039] As in the examples shown in FIGS. 16 to 20, the first head 403 may be located closer to the first end 400a than the shaft portion 401. The outer diameter of the first head 403 may be larger than the minimum value of the inner diameter of the through-hole 305. Furthermore, the second head 405 may be located closer to the second end 400b than the shaft portion 401. The outer diameter of the second head 405 may be larger than the minimum value of the inner diameter of the through-hole 305. The outer diameters of the first head and the second head may be compared using the maximum values ​​of their respective outer diameters.

[0040] In this case, the outer diameter of the first head portion may be approximately 0.5 to 50 mm, the outer diameter of the second head portion 405 may be approximately 0.5 to 50 mm, and the inner diameter of the through-hole 305 may be approximately 0.5 to 45 mm.

[0041] When the outer diameters of the first head 403 and the second head 405 are larger than the minimum value of the inner diameter of the through-hole 305, the fixing member 400 is less likely to come out of the through-hole 305, and cutting can be performed stably.

[0042] Furthermore, the first head 403 and the second head 405 may have thread grooves on their outer peripheries. If the first head 403 and the second head 405 have thread grooves, thread grooves that mesh with the respective thread grooves may be located on the inner periphery of the second hole 113. If the first head 403 and the second head 405 can be screwed into the second hole 113, it becomes easier to position the fixing member 400 inside the second hole 113, and therefore it becomes easier to position the clamp member 300.

[0043] As shown in each example in FIGS. 16 to 20, the second head 405 may be detachable from the shaft 401. On the other hand, the first head 403 may be fixed to the shaft 401 or may be detachable. At least one of the first head 403 and the second head 405 may be fixed to the shaft 401. It may be detachable from 01.

[0044] When the cutting tool 1 has the above configuration, it can be assembled so that the fixing member 400 penetrates the clamping member 300 at the through hole 305. Therefore, the fixing member 400 can press the clamping member 300 at a location away from the end of the clamping member 300. In other words, the location of the clamping member 300 that is pressed by the fixing member 400 can be moved closer to the center of the clamping member 300, rather than the end of the clamping member 300. Therefore, according to the cutting tool 1 of the above aspect, the clamping member 300 is less likely to tilt, and the accuracy of fixing the insert 200 is improved.

[0045] 2 and 4, the first head 403 may be located closer to the first side surface 109c than the second head 405. In other words, the first head 403 may be located farther from the insert 200 than the second head 405.

[0046] When the cutting tool 1 has the above configuration, the first head 403 connected to the shaft 401 can be inserted from the side of the first side surface 109c, and the short second head 405 without the shaft 401 can be inserted into the second hole 113 from the side of the pocket 107, making assembly easy.

[0047] 14, the outer diameter of the first head 403 may be the same as the outer diameter of the second head 405. Note that the outer diameters being the same does not necessarily mean that the outer diameters are perfectly the same, and a deviation of about 30% is acceptable.

[0048] When the cutting tool 1 has the above configuration, it is easy to improve the operability of the fixing member 400. Furthermore, the inner diameter of the second hole 113 into which the fixing member 400 is inserted can be made constant, which makes it easy to increase the rigidity of the holder 100.

[0049] 17 to 19, the second head portion 405 may have a protruding portion 407. The protruding portion 407 may protrude toward the shaft portion 401.

[0050] 17 to 19, the shaft portion 401 may have a first hole portion 409. The protruding portion 407 may be inserted into the first hole portion 409. By inserting the protruding portion 407 into the first hole portion 409, the shaft portion 401 and the second head portion 405 may be connected to each other.

[0051] When the cutting tool 1 has the above-described configuration, the shaft portion 401 and the second head portion 405 are easily connected, and the fixing member 400 is easily assembled.

[0052] 17 and 18, the protrusion 407 may have a thread located on its outer circumferential surface, and the first hole 409 may have a thread groove located on its inner circumferential surface. When the protrusion 407 is screwed into the first hole 409, the thread of the protrusion 407 and the thread groove of the first hole 409 may engage with each other.

[0053] Furthermore, when screwing the protrusion 407 and the first hole 409 together, the protrusion 407 may be fixed by being turned either clockwise or counterclockwise. In the example shown in Fig. 17, the protrusion 407 is turned clockwise to show the threads by which the protrusion 407 and the first hole 409 are screwed together. In the example shown in Fig. 18, the protrusion 407 is turned counterclockwise to show the threads by which the protrusion 407 and the first hole 409 are screwed together.

[0054] If the direction of rotation when screwing the protrusion 407 and the first hole 409 is the same as the direction of rotation of the fixing member 400 when fixing the insert 200 to the holder 100, When fixing 00, the protrusion 407 and the first hole 409 are unlikely to come off.

[0055] When the cutting tool 1 has the above configuration, the shaft portion 401 and the second head portion 405 can be easily connected, which tends to facilitate the assembly of the fixing member 400. Furthermore, since the second head portion 405 is fastened with a screw, it is difficult for the shaft portion 401 to come off.

[0056] 19, the first hole 409 may have a first protrusion 411. The first protrusion 411 may extend from the bottom of the first hole 409 toward the second end 400b.

[0057] 19, the protruding portion 407 may have a first recess 413. The first recess 413 may be formed from the first end 400a side toward the second end 400b of the protruding portion 407. Furthermore, the first recess 413 may have the first protruding portion 411 inserted therein.

[0058] When the cutting tool 1 has the above configuration, the second head 405 is less likely to come off from the shank 401. Specifically, when the first convex portion 411 is inserted into the first concave portion 413, the first concave portion 413 is widened by the first convex portion 411. That is, the protruding portion 407 is widened inside the first hole portion 409. Therefore, the second head 405 having the protruding portion 407 is less likely to come off from the shank 401 having the first hole portion 409.

[0059] When the second head 405 and the shaft 401 are connected by the protrusion 407 and the first hole 409, there is no problem in fixing the protrusion 407 and the first hole 409. For example, the protrusion 407 and the first hole 409 may be fixed by applying an adhesive to them. The fixing method is not limited to adhesive, and other methods such as soldering may also be used.

[0060] When the protrusion 407 and the first hole 409 are fixed as described above, the shaft 401 and the second head 405 are fixed, and the strength of the fixing member 400 tends to increase.

[0061] 20 to 22, the shaft portion 401 may have a first portion 415 and a second portion 417. The first portion 415 may be located closer to the first end 400a. The second portion 417 may be located closer to the second end 400b than the first portion 415. The outer diameter of the second portion 417 may be smaller than the outer diameter of the first portion 415.

[0062] 20 to 22, the second head 405 may have a second hole 419. The second hole 419 may be located on the first end 400a side of the second head 405. The second part 417 may be inserted into the second hole 419. The shaft 401 and the second head 405 may be connected by inserting the second part 417 into the second hole 419.

[0063] When the cutting tool 1 has the above-described configuration, the shaft portion 401 and the second head portion 405 are easily connected, and the fixing member 400 is easily assembled.

[0064] 20 and 21 , the second part 417 may have a thread located on its outer circumferential surface, and the second hole part 419 may have a thread groove located on its inner circumferential surface. When the second part 417 is screwed into the second hole part 419, the thread of the second part 417 and the thread groove of the second hole part 419 may mesh with each other.

[0065] Furthermore, when screwing the second portion 417 and the second hole portion 419 together, the second portion 417 may be turned either clockwise or counterclockwise to be fixed. In the example shown in FIG. 20, the second portion 417 is turned clockwise to form a thread that screws the second portion 417 and the second hole portion 419 together. In the example shown in FIG. 21, the second portion 417 is turned clockwise to form a thread that screws the second portion 417 and the second hole portion 419 together. is turned counterclockwise to form a screw thread that screws into second portion 417 and second hole portion 419.

[0066] If the direction in which the second portion 417 and the second hole portion 419 are rotated when screwing them together is the same as the direction in which the fixing member 400 is rotated when fixing the insert 200 to the holder 100, the second portion 417 and the second hole portion 419 are less likely to come off when fixing the insert 200.

[0067] When the cutting tool 1 has the above configuration, the shaft portion 401 and the second head portion 405 can be easily connected, which tends to facilitate the assembly of the fixing member 400. Furthermore, since the second head portion 405 is fastened with a screw, it is difficult for the shaft portion 401 to come off.

[0068] 22, the second hole 419 may have a second protrusion 421. The second protrusion 421 may extend from the bottom of the second hole 419 toward the first end 400a.

[0069] 22, the second portion 417 may have a second recess 423. The second recess 423 may be formed from the second end 400b side of the second portion 417 toward the first end 400a. Furthermore, the second recess 423 may have the second protrusion 421 inserted therein.

[0070] When the cutting tool 1 has the above configuration, the second head 405 is less likely to come off from the shank 401. Specifically, when the second convex portion 421 is inserted into the second concave portion 423, the second concave portion 423 is widened by the second convex portion 421. That is, the second portion 417 is widened inside the second hole portion 419. Therefore, the second head 405 having the second hole portion 419 is less likely to come off from the shank 401 having the second portion 417.

[0071] When the shaft portion 401 and the second head portion 405 are connected by the second portion 417 and the second hole portion 419, there is no problem in fixing the second portion 417 and the second hole portion 419. For example, the second portion 417 and the second hole portion 419 may be fixed by applying an adhesive to them. The fixing method is not limited to adhesive, and other methods such as soldering may also be used.

[0072] When second portion 417 and second hole portion 419 are fixed as described above, shaft portion 401 and second head portion 405 are fixed, and the strength of fixing member 400 tends to increase.

[0073] As an example shown in FIG. 12, the through-hole 305 may have a first tapered portion 307 and a second tapered portion 309 having a tapered shape.

[0074] 12, 13, and 15, the first tapered portion 307 may be located on the side of the first end 400a. Also, the inner diameter of the first tapered portion 307 may increase as it approaches the first end 400a.

[0075] 11, 12, and 14, the second tapered portion 309 may be located on the second end 400b side. Also, the inner diameter of the second tapered portion 309 may increase as it approaches the first end 400a.

[0076] When the cutting tool 1 has the above configuration, the clamping member 300 is more likely to come into contact with the fixing member 400, and the clamping member 300 is more likely to move due to the fixing member 400. This makes it easier to attach the insert 200 to and detach it from the holder 100.

[0077] As an example shown in FIGS. 9 and 11 to 15, the through hole 305 may have a first step portion 311 and a second step portion 313. The first step portion 311 may be adjacent to the first tapered portion 307. The first step portion 311 may also be located on the inner circumferential surface of the through hole 305. The difference portion 313 may be adjacent to the second tapered portion 309. The second step portion 313 may be located on the inner circumferential surface of the through hole 305.

[0078] 11 and 13, the height of first step portion 311 may be defined as a first height H1, and the height of second step portion 313 may be defined as a second height H2. Note that the heights of first step portion 311 and second step portion 313 each refer to the width from the inner circumferential surface of through hole 305 toward second center axis L2.

[0079] As shown in an example in Figure 11, the first height H1 may be greatest nearest the leading end 100a, and as shown in an example in Figure 13, the second height H2 may be greatest nearest the trailing end 100b.

[0080] In the case where cutting tool 1 has the above-described configuration, when clamping member 300 is moved by fixing member 400, first step portion 311 or second step portion 313 comes into contact with fixing member 400 after clamping member 300 has moved a certain distance, making further movement of clamping member 300 difficult. This makes it easier to control the movement of clamping member 300.

[0081] As shown in an example in Fig. 11, the first height H1 may increase toward the rear end 100b. Furthermore, as shown in an example in Fig. 13, the second height H2 may increase toward the front end 100a.

[0082] When the cutting tool 1 has the above-described configuration, when the clamping member 300 is moved by the fixing member 400, not only is the movement of the clamping member 300 easily controlled, but the thickness inside the through hole 305 increases, and the strength of the clamping member 300 is likely to increase.

[0083] 16, the first head 403 may have a first portion 425 and a second portion 427. The first portion 425 may be located on the side of the first end 400a. The first portion 425 may have a thread groove on its outer circumferential surface.

[0084] 16, the second portion 427 may be located closer to the second end 400b than the first portion 425. The second portion 427 may have a tapered shape in which the outer diameter decreases toward the second end 400b. Furthermore, the second portion 427 may be used to move the clamp member 300 by contacting the first tapered portion 307 of the clamp member 300.

[0085] 16, the second head 405 may have a third portion 429 and a fourth portion 431. The third portion 429 may be located on the second end 400b side. The third portion 429 may have a thread groove on its outer circumferential surface.

[0086] 16 , the fourth portion 431 may be located closer to the first end 400a than the third portion 429. The fourth portion 431 may have a tapered shape in which the outer diameter decreases toward the first end 400a. Furthermore, the fourth portion 431 may be used to move the clamp member 300 by coming into contact with the second tapered portion 309 of the clamp member 300.

[0087] When the cutting tool 1 has the above-described configuration, the fixing member 400 makes it easier to move the clamping member 300.

[0088] As shown in an example in Figure 23, the clamp member 300 can be operated using the fixing member 400. When changing from the state in Figure 23(b) to the state in Figure 23(a), the fixing member 400 The fixing member 400 may move along the central axis L2 toward the first end 400a. When the fixing member 400 moves, the second tapered portion 309 of the clamping member 300 and the fourth portion 431 of the fixing member 400 may come into contact with each other.

[0089] When the fixing member 400 is further moved toward the first end 400a while the second tapered portion 309 and the fourth portion 431 are in contact with each other, the respective tapered shapes may move in a sliding manner relative to each other. In the above case, the clamping member 300 may move toward the rear end 100b, in other words, the clamping member 300 may move so as to be drawn into the first hole 111. This movement may cause the clamping member 300 to apply a force that presses the insert 200 against the holder 100. In this way, the insert 200 may be fixed to the holder 100 by operating the fixing member 400 to move the clamping member 300.

[0090] 23(d), the fixing member 400 may move along the second central axis L2 toward the second end 400b. When the fixing member 400 moves, the first tapered portion 307 of the clamping member 300 and the second portion 427 of the fixing member 400 may come into contact with each other.

[0091] When the fixing member 400 is further moved toward the second end 400b while the first tapered portion 307 and the second portion 427 are in contact, the respective tapered shapes may slide against each other. In the above case, the clamping member 300 may move along the first central axis L1 toward the tip 100a, in other words, so that the clamping member 300 comes out of the first hole 111. This movement may weaken the force with which the clamping member 300 presses the insert 200 against the holder 100. In this way, the insert 200 may be removed from the holder 100 by operating the fixing member 400 to move the clamping member 300.

[0092] The attachment and detachment of the insert 200 by the clamping member 300 is not limited to the example shown in Fig. 23. For example, the clamping member 300 may be configured such that when the fixing member 400 is moved toward the first end 400a, the clamping member 300 moves toward the leading end 100a, allowing the insert 200 to be removed. Alternatively, the clamping member 300 may be configured such that when the fixing member 400 is moved toward the second end 400b, the clamping member 300 moves along the first central axis L1 toward the rear end 100b, allowing the insert 200 to be fixed.

[0093] In this way, the clamp member 300 may be able to restrain the insert 200. Furthermore, the first head 403 or the second head 405 may abut against the through-hole 305, thereby enabling the clamp member 300 to be positioned in the direction along the first central axis L1.

[0094] When the cutting tool 1 has the above configuration, the fixing member 400 can press a location away from the end face of the clamping member 300. Therefore, the clamping member 300 is less likely to tilt with respect to the first central axis L1, and the insert 200 can be more easily fixed accurately.

[0095] Furthermore, the fixing member 400 is configured to penetrate the clamping member 300, and by simply changing the direction in which the fixing member 400 is moved, it is possible to change whether it abuts against the first tapered portion 307 or the second tapered portion 309 of the clamping member 300, making it easy to control the movement of the clamping member 300 in the direction along the first central axis L1.

[0096] <Method of manufacturing machined products> The machined product can be produced by machining a workpiece 501. A method for manufacturing a machined product in a non-limiting embodiment of the present disclosure may include the following steps: (1) rotating the workpiece 501; (2) bringing the cutting tool 1, typified by the above-described embodiments, into contact with a rotating workpiece 501; (3) a step of separating the cutting tool 1 from the workpiece 501; It is equipped with:

[0097] More specifically, first, as shown in an example in Fig. 24, the workpiece 501 is rotated around the axis R, and the cutting tool 1 is brought relatively close to the workpiece 501. Next, as shown in an example in Fig. 25, the ridge line (cutting edge) of the cutting tool 1 is brought into contact with the workpiece 501 to cut the workpiece 501. Then, as shown in an example in Fig. 26, the cutting tool 1 is moved relatively away from the workpiece 501.

[0098] In Fig. 24, the axis R is fixed and the workpiece 501 is rotated around the axis R, and the cutting tool 1 is moved in the Y1 direction to approach the workpiece 501. In Fig. 25, the cutting edge of the insert 200 is brought into contact with the rotating workpiece 501 to cut the workpiece 501. In Fig. 26, the cutting tool 1 is moved in the Y2 direction to move away from the rotating workpiece 501.

[0099] In the cutting process in the manufacturing method of the embodiment, the cutting tool 1 is moved in each process to bring the cutting tool 1 into contact with the workpiece 501 or to move the cutting tool 1 away from the workpiece 501, but of course, this is not limited to this form.

[0100] For example, in step (1), the workpiece 501 may be brought closer to the cutting tool 1. Similarly, in step (3), the workpiece 501 may be moved away from the cutting tool 1. When continuing the cutting process, the workpiece 501 may be kept rotating, and the step of bringing the cutting edge of the insert 200 into contact with different positions on the workpiece 501 may be repeated.

[0101] Representative examples of the material of the workpiece include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals. [Explanation of symbols]

[0102] 1...cutting tools 100 holder 100a··Tip 100b...rear end 101···head 103 Shank 105...Tip surface 107···Pocket 109...Side 109a...Upper side 109b...Lower side 109c...1st side 109d...Second side 111···1st hole 113...2nd hole 200···Insert 201...Top surface 203...Bottom surface 205...Side 205a...1st side surface 205b Second lateral surface 207 First through hole 300 Clamping member 301 Main body 303...Protrusion 305... Second through hole (through hole) 307···First tapered section 309...Second tapered section 311···First step 313 Second step 400 Fixing member 400a··First end 400b...2nd end 401···Shaft 403...1st head 405...2nd head 407...Protrusion 409...1st hole 411···First convex part 413···First recess 415...1st part 417...2nd part 419...2nd hole part 421···Second convex part 423...Second recess 425...Part 1 427...Second part 429...3rd part 431...4th part 501...Work material L1...1st central axis L2...Second central axis

Claims

1. It has a rod shape extending from the front end to the rear end, a tip surface located on the tip side; a pocket located on the side of the tip; a first side surface extending from the tip surface toward the rear end and positioned on the opposite side of the pocket; a first hole extending from the tip surface toward the rear end along a first central axis extending from the tip end toward the rear end; a holder having a second hole extending from the first side surface to the first hole along a second central axis inclined relative to the first central axis; an insert located in the pocket; a clamp member inserted into the first hole; a fixing member inserted into the second hole, The clamp member is a main body portion inserted into the first hole and extending along the first central axis and having a through hole extending along the second central axis; a protrusion extending from the body portion toward the insert, The fixing member extends from a first end to a second end along the second central axis, a rod-shaped shaft portion inserted into the through hole; a first head portion located closer to the first end than the shaft portion and having an outer diameter larger than the minimum inner diameter of the through hole; a second head portion located closer to the second end than the shaft portion and having an outer diameter larger than the minimum inner diameter of the through hole, The second head is detachable from the shaft.

2. The cutting tool according to claim 1 , wherein the first head portion is located closer to the first side surface than the second head portion.

3. The cutting tool of claim 1 , wherein an outer diameter of the first head is the same as an outer diameter of the second head.

4. The second head portion has a protrusion that protrudes toward the shaft portion, The cutting tool according to claim 1 , wherein the shank has a first hole into which the protrusion is inserted.

5. The cutting tool according to claim 4 , wherein the protrusion is screwed into the first hole.

6. the first hole portion has a first protrusion portion extending from a bottom of the first hole portion toward the second end, The cutting tool according to claim 4 , wherein the protruding portion has a first recess into which the first protrusion is inserted.

7. The shaft portion is a first portion located on the first end side; a second portion located closer to the second end than the first portion and having a smaller outer diameter than the first portion; The cutting tool according to claim 1 , wherein the second head has a second hole into which the second portion is inserted.

8. The cutting tool according to claim 7 , wherein the second portion is screwed into the second hole portion.

9. the second hole portion has a second protrusion extending from a bottom of the second hole portion toward the first end, The cutting tool according to claim 7 , wherein the second portion has a second recess into which the second protrusion is inserted.

10. The through hole is a first tapered portion located on the first end side and having an inner diameter that increases toward the first end; The cutting tool according to claim 1 , further comprising: a second tapered portion located on the second end side and having an inner diameter that increases toward the second end.

11. The through hole is a first step portion adjacent to the first tapered portion and located on an inner circumferential surface of the through hole; a second step portion adjacent to the second tapered portion and located on the inner circumferential surface of the through hole, the height of the first step is greatest nearest the tip, The cutting tool of claim 10 , wherein the height of the second step is greatest nearest the trailing end.

12. the height of the first step portion increases as it approaches the tip, The cutting tool according to claim 11 , wherein the height of the second step portion increases toward the rear end.

13. The first head portion includes: A first part; and a second portion located closer to the second end than the first portion and having a tapered shape in which the outer diameter decreases as the second end is approached, The second head portion is A third part; and 11. The cutting tool according to claim 10, further comprising: a fourth portion located closer to the first end than the third portion, the fourth portion having a tapered shape with an outer diameter that decreases toward the first end.

14. It has a rod shape extending from the front end to the rear end, a tip surface located on the tip side; a pocket located on the side of the tip; a first side surface extending from the tip surface toward the rear end; a first hole extending from the tip surface toward the rear end along a first central axis; a holder having a second hole extending from the first side surface to the first hole along a second central axis inclined relative to the first central axis; an insert located in the pocket; a clamp member inserted into the first hole and capable of restraining the insert; a fixing member inserted into the second hole, the clamp member has a through hole extending along the second central axis, The fixing member extends from a first end to a second end along the second central axis, a rod-shaped shaft portion inserted into the through hole; a first head portion located closer to the first end than the shaft portion and having an outer diameter larger than the minimum inner diameter of the through hole; a second head portion located closer to the second end than the shaft portion and having an outer diameter larger than the minimum inner diameter of the through hole, When the first head portion or the second head portion abuts against the through hole, the first central axis The clamping member can be positioned in a direction along the axis of the clamping member. The second head is detachably attached to the shank.

15. rotating the workpiece; A step of bringing the cutting tool according to any one of claims 1 to 14 into contact with the rotating workpiece; and removing the cutting tool from the workpiece.

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