Cutting tool and method for manufacturing cut product
The cutting tool's innovative holder design with inclined holes and tapered recesses stabilizes the cutting insert, addressing inefficiencies in existing screw and clamp mechanisms by ensuring secure and stable attachment, thereby enhancing tool longevity.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- KYOCERA CORP
- Filing Date
- 2025-11-04
- Publication Date
- 2026-06-25
AI Technical Summary
Existing cutting tools with screw and clamp mechanisms for securing cutting inserts are inefficient and unstable during machining, leading to potential detachment and reduced tool life.
A cutting tool design featuring a holder with inclined holes and tapered recesses for a clamp member and fixing member, which securely fastens the insert by a sliding mechanism, ensuring stable attachment and easy detachment.
The design enhances the stability of the cutting insert during machining, preventing detachment and improving tool longevity by ensuring secure and efficient engagement with the holder.
Smart Images
Figure JP2025038499_25062026_PF_FP_ABST
Abstract
Description
Cutting Tool and Method for Manufacturing a Machined Product
[0001] The present disclosure relates to a cutting tool used when machining a workpiece such as metal, and a method for manufacturing a machined product.
[0002] Conventionally, as an example of a fixing method of a cutting insert to a holder in an insert-type cutting tool, a clamping mechanism using a screw and a clamp as described in Patent Document 1 has been used.
[0003] The cutting tool described in Patent Document 1 has a structure in which a clamp is drawn in by turning a screw, and the insert is fastened by pressing the insert against the holder with the clamp.
[0004] Japanese Patent Application Laid-Open No. 62-88502
[0005] The cutting tool shown in one aspect includes a holder, an insert, a clamping member, and a fixing member. The holder has a bar shape extending from a first end to a second end, and has a first end face, a first side face, a second side face, a pocket, an upper side face, a lower side face, a first hole, and a second hole. The first end face is located on the side of the first end. The first side face extends from the first end face toward the second end. The second side face is located on the opposite side of the first side face. The pocket is connected to the first end face and the second side face. The upper side face is located between the first side face and the pocket. The lower side face is located on the opposite side of the upper side face. The first hole extends along a first central axis from the first end face toward the second end and opens to the pocket. The second hole extends from the first side face to the first hole along a second central axis inclined with respect to the first central axis. The insert is located in the pocket. The clamping member is inserted into the first hole. The fixing member is inserted into the second hole.
[0006] The clamping member has a main body and a projection. The main body extends along a first central axis. The projection extends from the main body toward the insert. The main body has a recess. The recess opens toward a second hole, and its inner diameter decreases as it moves away from the second hole. The fixing member has a first tip that can be inserted into the recess. The outer diameter of the first tip decreases as it moves away from the second hole. In a plan view from the upper side, the second central axis passes through the projection and the fixing member.
[0007] This is a perspective view showing a cutting tool from one aspect of the present disclosure. This is an enlarged view of area A1 in Figure 1, showing the cutting tool in disassembled form. This is a view showing the holder and insert in the enlarged view shown in Figure 2. This is a view showing the holder and insert in the enlarged view shown in Figure 2. This is a view showing the mounting state of the insert in the enlarged view shown in Figure 2. This is a side view of the cutting tool shown in Figure 1, viewed from direction B1. This is a side view of the cutting tool shown in Figure 1, viewed from direction B2. This is a cross-sectional view taken along the line VIII-VIII in Figure 7. This is a front view of the cutting tool shown in Figure 1, viewed from direction B3. This is a perspective view of the cutting tool shown in Figure 5, viewed from direction B4. This is a side view of the cutting tool shown in Figure 5, viewed from direction B5. This is a perspective view showing a clamp member from one aspect of the present disclosure. This is a perspective view of the clamp member shown in Figure 12, viewed from direction C1. This is a side view of the clamp member shown in Figure 12, viewed from direction C2. This is a side view showing a fixing member from one aspect of the present disclosure. This is a side view showing a stopper member from one aspect of the present disclosure. This is a perspective view showing a clamp member from one aspect of the present disclosure. This is a schematic diagram showing one step in the manufacturing method of an example of a machined workpiece, not limited to this disclosure. This is a schematic diagram showing one step in the manufacturing method of an example of a machined workpiece, not limited to this disclosure. This is a schematic diagram showing one step in the manufacturing method of an example of a machined workpiece, not limited to this disclosure.
[0008] The cutting tool 1 of this 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 parting tools.
[0009] The figures referenced below are simplified for illustrative purposes, showing only the main components necessary to illustrate the cutting tool 1 of the embodiment. Therefore, the cutting tool 1 of this disclosure may include any components not shown in the referenced figures. Furthermore, the dimensions of the components in the figures do not faithfully represent the dimensions of the actual components or their dimensional ratios. This disclosure is not limited to the following embodiments.
[0010] <Cutting Tool> As shown in the example in Figure 2, the cutting tool 1 comprises a holder 100, an insert 200, a clamping member 300, and a fixing member 400.
[0011] As shown in the example in Figure 1, the holder 100 may be in the shape of a rod extending from the first end 100a to the second end 100b. As shown in the example in Figure 1, the holder 100 may also be in the shape of a rectangular prism.
[0012] Steel and cast iron may be used as materials for the holder 100. In particular, when steel is used among these materials, the toughness of the holder 100 is high.
[0013] As shown in the example in Figures 1, 6, and 7, the holder 100 may have a head 101 and a shank 103. The head 101 may be located on the side of the first end 100a of the holder 100. The shank 103 may be located on the side of the second end 100b of the head 101.
[0014] The shank 103 may be the part that is gripped by the machine tool when the cutting tool 1 is attached to the machine tool. On the other hand, the head 101 is the part for gripping the insert 200 and has a pocket 107, which will be described later. The shank 103 is generally a simple cylindrical or prismatic shape.
[0015] As shown in the example in Figures 1 and 2, the holder 100 may have a first end face 105, a pocket 107, and a side surface 109.
[0016] The first end face 105 may be located on the side of the first end 100a of the holder 100. In other words, the first end face 105 may be located on the head 101. The first end face 105 may be formed by a single plane or by multiple planes. In one example shown in Figures 1 to 5, it is formed by multiple planes. Furthermore, the first end face 105 may be formed by a curved surface instead of a plane.
[0017] As shown in the example in Figures 2-5, the pocket 107 may be located on the side of the first end 100a of the holder 100. In other words, the pocket 107 may be located on the head 101. In this case, the pocket 107 may be configured such that the side of the first end of the head 101 is partially cut out. The pocket 107 may be adjacent to the first end face 105, or it may extend from the first end face 105 toward the second end 100b. An insert 200 can be attached to the pocket 107.
[0018] As shown in the example in Figure 1, the side surface 109 may extend from the first end surface 105 toward the second end surface 100b. The side surface 109 may be composed of multiple planes. For example, as shown in the example in Figure 1, the side surface 109 may have an upper side surface 109a, a lower side surface 109b, a first side surface 109c, and a second side surface 109d. The upper side surface 109a may be located upward, and the lower side surface 109b may be located opposite to the upper side surface 109a. The first side surface 109c may be located opposite to the pocket 107, and the second side surface 109d may be located on the same side as the pocket 107. The upper side surface 109a and the lower side surface 109b are for convenience only and do not indicate upward and downward directions. For example, the upper side surface 109a does not need to face upward when using the cutting tool 1. This is also true for other parts that include upward and downward expressions.
[0019] As shown in one example in Figure 10, the holder 100 may have a first hole 111 and a second hole 113.
[0020] As shown in the example in Figure 8, the first hole 111 may extend along the first central axis L1 from the first end face 105 toward the second end 100b. The first hole 111 may open at the first end face 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 direction in which the holder 100 extends, or it may be inclined. In other words, the statement that the first hole 111 extends along the first central axis L1 is not limited to a configuration in which the direction in which the first hole 111 extends is strictly parallel to the first central axis L1.
[0021] As shown in the example in Figure 8, the second hole 113 may extend along a second central axis L2 that is inclined with respect to the first central axis L1. Alternatively, the second hole 113 may extend from the first side surface 109c to the first hole 111. In the example shown in Figure 10, it 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 located in pocket 107 is not limited to a specific shape. As shown in one example in Figures 2 and 3, the insert 200 may be polygonal. The insert 200 may have a top surface 201, a bottom surface 203, a pair of lateral sides 205, and a through hole 207.
[0023] As shown in the example in Figure 2, the top surface 201 may be the upper surface of the insert 200. The bottom surface 203 may be the lower surface of the insert 200. The pair of lateral surfaces 205 may be located between the top surface 201 and the bottom surface 203. Of the pair of lateral surfaces 205, the surface that abuts the pocket 107 may be the first lateral surface 205a, and the surface that does not abut the pocket 107 and is located on the opposite side from the first lateral surface 205a may be the second lateral surface 205b.
[0024] As shown in the example in Figure 2, the through-hole 207 may be positioned to penetrate a pair of lateral surfaces 205. In other words, the through-hole 207 may be positioned from the first lateral surface 205a to the second lateral surface 205b. In this case, the through-hole 207 may open in the central portion of each of the pair of lateral surfaces 205. A clamp member 300 may be inserted into the through-hole 207.
[0025] The size of the insert 200 is not particularly limited. For example, the length in the direction along the first central axis L1 may be about 1 to 100 mm. The height from the top surface 201 to the bottom surface 203, in other words, the width in the vertical direction, may be about 1 to 100 mm. The width between the pair of lateral surfaces 205 may be about 0.1 to 50 mm.
[0026] Examples of materials for the insert 200 include cemented carbide and inorganic materials such as cermet. Examples of cemented carbide compositions 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 bonding phase.
[0027] Furthermore, the cermet may be a sintered composite material obtained by compounding a metal with a ceramic component. Examples of cermets include compounds 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 film formed by chemical vapor deposition (CVD) or physical vapor deposition (PVD). The film composition may include TiC, TiN, titanium carbonitride (TiCN), and alumina (Al ２ O ３ Examples include:
[0029] As shown in the example in Figure 8, the clamp member 300 may be inserted into the first hole 111 provided in the holder 100. The clamp member 300 is capable of restraining 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 determined by applying force to the insert 200 in a direction that presses it toward the pocket 107.
[0030] As shown in the example in Figures 12-14, the clamp member 300 may have a main body portion 301 and a projection portion 303. The main body portion 301 may be inserted into the first hole 111 and extend along the first central axis L1. The main body portion 301 is not limited to a specific shape. Specifically, the main body portion 301 may be cylindrical or prismatic in shape. Here, "cylindrical" and "prismatic" are not limited to the shape in a strict sense, but may be described as "cylindrical" or "prismatic" as long as the whole is generally "cylindrical" or "prismatic". In the example shown in Figures 12-14, the main body portion 301 is cylindrical.
[0031] As shown in the example in Figures 5 and 8, the projection 303 may extend from the main body 301 toward the insert 200 and be inserted into the through hole 207. Also, in the example shown in Figures 8 and 12, a portion of the projection 303 is curved toward the second end 100b. When the projection 303 has the above shape, the insert 200 is easily held by the projection 303. The projection 303 is not limited to the above shape. It is sufficient that the insert 200 can be attached by the projection 303, and various specific forms may be designed. For example, the projection 303 may be straight, or it may have a curved shape overall.
[0032] As shown in the example in Figures 12 and 13, the clamp member 300 may be roughly L-shaped, and the main body portion 301 and the projection portion 303 may each correspond to two sides of the L shape. For example, in the example shown in Figures 12 and 13, the main body portion 301 corresponds to the long side of the L shape, and the projection portion 303 protrudes from the end of the main body portion 301 and corresponds to the short side of the L shape.
[0033] As shown in the example in Figures 13 and 14, the main body portion 301 may have a recess 305. As shown in the example in Figure 8, the recess 305 may open toward the second hole 113. In this case, the recess 305 opens toward the fixing member 400 so that the first tip portion 401 of the fixing member 400, which will be described later, can come into contact with it.
[0034] As shown in the example in Figure 8, the recess 305 may have a tapered shape in which the inner diameter decreases as it moves away from the first side surface 109c. In the example shown in Figure 14, the recess 305 has a shape like a frustocone.
[0035] The recess 305 may have any overall shape as long as it has a tapered shape. Specifically, the recess 305 may be conical, pyramidal, truncated pyramidal, or groove-like.
[0036] For example, steel and cast iron may be used as the material for the clamp member 300. In particular, when steel is used among these materials, the toughness of the clamp member 300 is high.
[0037] As shown in the example in Figures 8 and 15, the fixing member 400 may have a first tip portion 401. The first tip portion 401 may be the portion that is inserted into the recess 305 and is in contact with the recess 305. Alternatively, the first tip portion 401 may have a tapered shape in which the outer diameter decreases as it moves away from the second hole 113.
[0038] For example, steel and stainless steel may be used as the material for the fixing member 400. In particular, when steel is used, the toughness of the fixing member 400 tends to be high.
[0039] The fixing member 400 may move so as to be pushed into the second hole 113, causing the first tip portion 401 and the recess 305 to come into contact. Since both the first tip portion 401 and the recess 305 are tapered, the tapered slopes come into contact with each other and slide, causing the clamp member 300 to move toward the second end 100b.
[0040] Assume that the projection 303 of the clamp member 300 is inserted into the through hole 207 of the insert 200, and the clamp member 300 is moving toward the second end 100b. In this case, as the clamp member 300 moves, the insert 200 moves so as to be pressed against the pocket 107. This allows the insert 200 to be attached to the holder 100.
[0041] When the holder 100 is viewed in a plane perspective from the side of the upper surface 109a, the second central axis L2 may pass through the protrusion 303 and the fixing member 400. Viewing in a plane perspective from the side of the upper surface 109a may mean evaluating by looking at a cross-sectional view of the holder 100 from the side of the upper surface 109a. Specifically, the largest width among the widths in the direction from the upper surface 109a to the lower surface 109b of the clamp member 300 is taken as the first width W1. Then, a cross-section in a plane passing through the midpoint of the first width W1, as well as the insert 200, the clamp member 300, and the fixing member 400 and parallel to the lower surface 109b may be evaluated when viewed from the side of the upper surface 109a. The cross-section in the above case is the cross-section shown in FIG. 8. For the sake of convenience, this cross-section is taken as the first cross-section.
[0042] In an example shown in FIG. 8, the second central axis L2 passes through the protrusion 303 and the fixing member 400. In such a case, when the holder 100 is viewed in a plane perspective from the side of the upper surface 109a, it may be evaluated that the second central axis L2 passes through the protrusion 303 and the fixing member 400.
[0043] Since the clamp member 300 has the concave portion 305 and the fixing member 400 has the first tip portion 401, the concave portion 305 and the first tip portion 401 interlock to move the clamp member 300. When the clamp member 300 moves, the insert 200 is mounted on the holder 100 so as to be drawn toward the side of the second end 100b by the protrusion 303. Also, a force that presses the edge of the through-hole 207 toward the side of the lower surface 109b acts on the insert 200 by the protrusion 303. Therefore, it becomes easier to withstand the stress that the insert 200 is drawn into the workpiece during cutting and the stress that presses the insert downward, and the insert 200 is likely to be stably held.
[0044] Further, since the second central axis L2 passes through the protrusion 303 and the fixing member 400, the distance from the contact portion between the first tip portion 401 and the concave portion 305 to the protrusion 303 is likely to be short. Therefore, the force of the fixing member 400 is likely to be transmitted to the protrusion 303, and the insert 200 is likely to be stably held.
[0045] For the above reasons, when the cutting tool 1 has the above configuration, the insert 200 is likely to be stably held even during cutting.
[0046] As shown in an example in FIGS. 8 and 13, in the recess 305, the portion located on the side of the second end 100b may be closer to the second hole 113 than the portion located on the side of the first end 100a. When the cutting tool 1 has the above configuration, the first tip 401 can easily move the clamping member 300 toward the second end 100b. Therefore, the insert 200 is likely to be stably held.
[0047] Further, because of having the above configuration, the main body portion 301 may have a notch portion 307 where a part of the main body portion 301 is cut away. In an example shown in FIGS. 13 and 14, the notch portion 307 is a portion cut away from the recess 305 toward the protrusion 303 in the main body portion 301. The notch portion 307 may be a flat surface or a curved surface. In an example shown in FIGS. 13 and 14, the notch portion 307 is a flat surface.
[0048] As shown in an example in FIG. 8, in the first cross-section, an axis passing through the midpoint of the width in the direction along the first central axis L1 of the recess 305 and parallel to the second central axis L2 may be the third central axis L3. The intersection point of the third central axis L3 and the recess 305 may be regarded as the center of the recess 305. The center of the recess 305 may also be referred to as point M.
[0049] In a plan view from the side of the upper surface 109a, the second central axis L2 may be located away from point M. That is, as shown in an example in FIG. 8, in the first cross-section, the second central axis L2 may be located away from point M.
[0050] When the second central axis L2 is away from point M, the first tip 401 abuts against the recess 305 while being deflected in the direction along the first central axis L1. Specifically, in an example shown in FIG. 8, the first tip 401 abuts against the recess 305 on the side of the second end 100b from point M, and does not abut against the recess 305 on the side of the first end 100a from point M in the recess 305.
[0051] As described above, when the first tip portion 401 is unevenly in contact with the recess 305, when the fixing member 400 is moved, the clamp member 300 tends to move in the direction toward the point where the fixing member 400 is in contact. However, it is difficult for it to move in the direction opposite to the point where the fixing member 400 is in contact.
[0052] Specifically, in the example shown in Figure 8, when the fixing member 400 moves away from the first side surface 109c, the clamp member 300 moves toward the second end 100b. However, since the first tip portion 401 does not contact the part of the recess 305 that is on the side of the first end 100a from point M, it is difficult for it to move toward the first end 100a.
[0053] For the reasons stated above, when the second central axis L2 is away from point M, the clamp member 300 is more likely to move in the intended direction, that is, in the direction for holding the insert 200. Therefore, the insert 200 is more likely to be held.
[0054] In a planar perspective view from the upper surface 109a, the second central axis L2 may be located closer to the second end 100b than point M. In other words, as shown in the example in Figure 8, in the first cross-section, the second central axis L2 may be located closer to the second end 100b than point M. To put it another way, the first tip portion 401 may contact the recess 305 on the side of the second end 100b from point M, but may not contact the recess 305 on the side of the first end 100a from point M.
[0055] When the second central axis L2 is located closer to the second end 100b than point M, the clamp member 300 is more likely to move toward the second end 100b. As a result, the insert 200 is more likely to be held in a position where it is pulled toward the second end 100b. This makes it easier for the insert 200 to withstand stresses that pull it toward the workpiece during cutting.
[0056] For the reasons stated above, when the cutting tool 1 has the above configuration, the insert 200 is more likely to be held stably.
[0057] In a planar perspective view from the side of the first end face 105, the second central axis L2 may be located closer to the lower surface 109b than point M. In other words, the first tip portion 401 may contact the side of the recess 305 that is closer to the lower surface 109b than point M, but may not contact the side of the recess 305 that is closer to the upper surface 109a than point M.
[0058] Viewing from the side of the first end face 105 means that the holder 100 may be evaluated by viewing its cross-sectional view from the side of the first end face 105. Specifically, the cross-section in a plane parallel to the first end face 105, passing through the insert 200, clamp member 300, and fixing member 400, may be evaluated by viewing it from the side of the first end 100a.
[0059] When the second central axis L2 is located closer to the lower surface 109b than point M, the clamp member 300 is more likely to move toward the lower surface 109b. As a result, the insert 200 is more likely to be held in a position where it is pulled toward the lower surface 109b. This makes it easier for the insert 200 to withstand the downward stress it receives from the workpiece during cutting.
[0060] For the reasons stated above, when the cutting tool 1 has the above configuration, the insert 200 is more likely to be held stably.
[0061] As shown in the example in Figure 8, the first hole 111 may be inclined so as it moves away from the first end face 105, it moves away from the second side surface 109d. In other words, the first central axis L1 may be inclined so as it moves away from the first end face 105, it moves away from the second side surface 109d. In this case, the first central axis L1 may be inclined at an angle of approximately 0° to 30° with respect to the second side surface 109d.
[0062] When the cutting tool 1 has the above configuration, the clamp member 300 moves to press the insert 200 against the holder 100. Therefore, the insert 200 is easily held stably.
[0063] The first hole 111 may be inclined such that it moves away from the upper surface 109a as it moves away from the first end face 105. In other words, the first central axis L1 may be inclined such that it moves away from the upper surface 109a as it moves away from the first end face 105. In this case, the first central axis L1 may be inclined at an angle of approximately 0° to 85° with respect to the lower surface 109b.
[0064] When the cutting tool 1 has the above configuration, the clamp member 300 moves to press the insert 200 against the holder 100. Therefore, the insert 200 is easily held stably.
[0065] As shown in the example in Figures 8 and 15, the fixing member 400 may have a first threaded portion 403 located closer to the first side surface 109c than the first tip portion 401. The first threaded portion 403 may have a first thread 403a on its outer circumferential surface.
[0066] The second hole 113 may have a first screw groove 113a on its inner circumferential surface. The first threads 403a on the outer circumferential surface of the first threaded portion 403 and the first screw groove 113a on the inner circumferential surface of the second hole 113 may interlock with each other. In other words, the first threaded portion 403 may be screwed into the second hole 113. When the cutting tool 1 has the above configuration, the fixing member 400 is less likely to come off the holder 100.
[0067] As shown in the example in Figures 10 and 11, the fixing member 400 may have a first rear end portion 405. The first rear end portion 405 may have a hole for operating the fixing member 400. The hole for operating the fixing member 400 is not limited to a specific shape. For example, the hole for operating the fixing member 400 may have a Phillips head, a slotted head, or a hexagonal star shape for operation with a screwdriver, or a hexagonal shape for operation with a hex wrench.
[0068] As shown in one example in Figure 8, the holder 100 may have a third hole 115. The third hole 115 may extend from the first side surface 109c to the first hole 111. The third hole 115 may be located closer to the first end 100a than the second hole 113, or it may be located further from the first end 100a than the second hole 113. In the example shown in Figures 10 and 11, the third hole 115 is located closer to the first end 100a than the second hole 113. Furthermore, the third hole 115 may be parallel to the first hole 111, or it may be inclined.
[0069] As shown in the example in Figure 8, the third hole 115 may have a portion with a larger inner diameter, a so-called counterbore, where it is connected to the first side surface 109c.
[0070] As shown in the example in Figures 8, 10, and 11, the cutting tool 1 may have a retaining member 500. The retaining member 500 may be inserted into the third hole 115.
[0071] As shown in the example in Figures 8 and 16, the stopper member 500 may have a second tip portion 501 and a second rear portion portion 503. The second rear portion portion 503 may be simply referred to as the rear portion portion 503.
[0072] As shown in the example in Figure 8, the second tip portion 501 may be inserted into the third hole 115. Furthermore, the second tip portion 501 may protrude toward the first hole 111. Specifically, as shown in the example in Figure 9, in a front view of the first end face 105, a part of the second tip portion 501 may protrude toward the first hole 111.
[0073] The second tip portion 501 may be used to prevent the clamp member 300 from coming out of the first hole 111. In other words, the second tip portion 501 may be used as a stopper for the clamp member 300. When the clamp member 300 moves through the first hole 111 toward the first end 100a, if a part of the second tip portion 501 protrudes into the first hole 111, the clamp member 300 will come into contact with the second tip portion 501 after moving a certain distance. When the clamp member 300 comes into contact with the second tip portion 501, the clamp member 300 cannot move any further toward the first end 100a. In this way, the second tip portion 501 may be used as a stopper for the clamp member 300.
[0074] As shown in the example in Figure 8, the second rear end portion 503 may be located closer to the first side surface 109c than the second front end portion 501. The second rear end portion 503 may be located in the third hole 115, or a part of it may protrude from the third hole 115. In the example shown in Figure 8, the entire second rear end portion 503 is located in the third hole 115.
[0075] As shown in the example in Figures 8 and 16, the outer diameter of the second rear end portion 503 may be larger than the outer diameter of the second front end portion 501. When the diameter of the second rear end portion 503 is larger than the outer diameter of the second front end portion 501, the second rear end portion 503 is less likely to be inserted at a position further away from the first side surface 109c than the counterbore portion of the third hole 115. As a result, the second front end portion 501 is less likely to protrude too far into the first hole 111. Consequently, when the clamp member 300 moves in the first hole 111, the second front end portion 501 is less likely to get in the way, and its function as a stopper is more easily achieved.
[0076] For the reasons stated above, when the cutting tool 1 has the above configuration, the clamp member 300 is less likely to fall out of the first hole 111.
[0077] As shown in the example in Figures 8, 10, and 11, the second rear end portion 503 may overlap the second hole 113 in a front view of the first side surface 109c. When the second rear end portion 503 overlaps the second hole 113, the fixing member 400 will not come out of the opening in the first side surface 109c of the first hole 111. Therefore, when the cutting tool 1 has the above configuration, the fixing member 400 is less likely to fall out of the holder 100 when the fixing member 400 is operated.
[0078] As shown in the example in Figure 11, the second rear end portion 503 may be positioned so as not to overlap with the hole for operating the fixing member 400 of the first rear end portion 405. If the second rear end portion 503 does not overlap with the hole for operating the fixing member 400, the fixing member 400 is easier to operate.
[0079] As shown in one example in Figure 16, the fastening member 500 may have a second threaded portion 505. The second threaded portion 505 may be located between the second tip portion 501 and the second rear end portion 503.
[0080] Furthermore, the second threaded portion 505 may have a second thread 505a on its outer circumferential surface. As shown in the example in Figure 8, the third hole 115 may have a second thread groove 115a on its inner circumferential surface. The second thread 505a on the outer circumferential surface of the second threaded portion 505 and the second thread groove 115a on the inner circumferential surface of the third hole 115 may interlock with each other. In other words, the second threaded portion 505 may be screwed into the third hole 115. When the cutting tool 1 has the above configuration, the retaining member 500 is less likely to fall out of the holder 100.
[0081] The second tip portion 501 and the second threaded portion 505 may be formed integrally or separately. In the example shown in Figure 16, the second tip portion 501 and the second threaded portion 505 are formed integrally. As in the example shown in Figure 16, when the second tip portion 501 and the second threaded portion 505 are formed integrally, the second thread 505a may extend to the outer circumferential surface of the second tip portion 501.
[0082] The clamp member 300 may have a protrusion 309, as shown in another example in Figure 17. The protrusion 309 may extend from the main body 301 toward the insert 200. The protrusion 309 may or may not contact the insert 200. The protrusion 309 may be located on the side of the first end 100a toward the projection 303.
[0083] The protrusion 309 may have the function of making it difficult for chips to get stuck between the insert 200 and the clamping member 300 during cutting. In other words, the protrusion 309 may be used to seal the gap between the insert 200 and the main body 301. Sealing the gap is not limited to sealing the gap in a strict sense. For example, a small gap may exist between the protrusion 309 and the insert 200.
[0084] When the cutting tool 1 has the above configuration, chips are less likely to enter the inside of the holder 100. Therefore, the operability of the clamp member 300 is less likely to be impaired by chips.
[0085] <Method for attaching and detaching the insert> Next, a method for attaching and detaching the insert 200 to the holder 100 will be described in an example not limited to the present disclosure.
[0086] When attaching the insert 200 to the holder 100, the clamp member 300, fixing member 400, and stopper member 500 are attached to the holder 100. Specifically, the clamp member 300 is inserted into the first hole 111, the fixing member 400 into the second hole 113, and the stopper member 500 into the third hole 115. After performing the above operation, the cutting tool 1 changes from the state shown in Figure 2 to the state shown in Figure 3.
[0087] Next, the projection 303 of the clamp member 300 is inserted into the through hole 207 of the insert 200, and the insert 200 is placed in the pocket 107. When inserting the projection 303 into the through hole 207, the projection 303 may be positioned in a way that it hooks onto the insert 200. After performing the above operation, the cutting tool 1 changes from the state shown in Figure 3 to the state shown in Figure 4.
[0088] Next, the clamp member 300 protruding from the first hole 111 is moved along the first central axis L1 in the direction from the first end 100a to the second end 100b (first direction). When moving the clamp member 300, it may be moved by sliding it in the first direction. After performing the above operation, the cutting tool 1 changes from the state shown in Figure 4 to the state shown in Figure 5.
[0089] Finally, the fixing member 400 is moved away from the first side surface 109c. This operation causes the clamp member 300 and the fixing member 400 to come into contact. The recess 305 and the first tip 401 come into contact, and the clamp member 300 moves in the first direction. As the clamp member 300 moves in the first direction, the projection 303 comes into contact with the insert 200, and the insert 200 moves in the first direction. As the insert 200 moves in the first direction, the insert 200 is pressed against the holder 100. Through the above operation, the insert 200 is mounted on the holder 100.
[0090] To remove the insert 200 from the holder 100, simply reverse the procedure used to install the insert 200 into the holder 100.
[0091] Specifically, first, the fixing member 400 is moved closer to the first side surface 109c. This operation reduces the force from the projection 303 that was pressing against the insert 200.
[0092] Next, the clamp member 300 is moved along the first central axis L1 in the direction from the second end 100b toward the first end 100a. At this time, the clamp member 300 is moved only to the position where the second tip 501 of the stopper member 500 contacts the recess 305. After performing the above operation, the cutting tool 1 changes from the state shown in Figure 5 to the state shown in Figure 4.
[0093] Finally, by removing the through-hole 207 from the projection 303, the insert 200 can be removed from the holder 100. After performing the above operation, the cutting tool 1 changes from the state shown in Figure 4 to the state shown in Figure 3.
[0094] In order for the cutting tool 1 to attach and detach the insert 200 by the above operation, the cutting tool 1 may have the following configuration. The clamp member 300 may be movable in a direction along the first central axis L1 and capable of restraining the insert 200. In particular, the projection 303 may be able to restrain the insert 200 by coming into contact with it.
[0095] Here, "restrainable" does not necessarily mean that the insert 200 is held down so that it cannot move at all. It may simply mean that the insert 200 is held down to a degree that does not hinder the cutting process performed by the insert 200.
[0096] Furthermore, the clamp member 300 may be movable from the first end 100a to the second end 100b in a direction along the first central axis L1 by contacting the fixing member 400 and the clamp member 300. In addition, in a plan view from the upper side surface 109a, the second central axis L2 may pass through the projection 303 and the fixing member 400.
[0097] When the cutting tool 1 has the above configuration, it is easy to stably hold the insert 200. In addition, the insert 200 can be easily attached and detached with simple operations.
[0098] <Method for Manufacturing a Machined Workpiece> A machined workpiece can be produced by cutting a workpiece 601. A method for manufacturing a machined workpiece in an embodiment not limited to this disclosure may include the following steps: (1) a step of rotating the workpiece 601; (2) a step of bringing a cutting tool 1, as represented in the above embodiment, into contact with the rotating workpiece 601; and (3) a step of moving the cutting tool 1 away from the workpiece 601.
[0099] More specifically, first, as shown in the example in Figure 18, the workpiece 601 is rotated around the axis R, and the cutting tool 1 is brought relatively close to the workpiece 601. Next, as shown in the example in Figure 19, the edge (cutting edge) of the cutting tool 1 is brought into contact with the workpiece 601, and the workpiece 601 is cut. Then, as shown in the example in Figure 20, the cutting tool 1 is moved relatively away from the workpiece 601.
[0100] In Figure 18, the cutting tool 1 is moved closer to the workpiece 601 by moving it in the Y1 direction while the axis R is fixed and the workpiece 601 is rotated around the axis R. In Figure 19, the workpiece 601 is cut by bringing the cutting edge of the insert 200 into contact with the rotating workpiece 601. In Figure 20, the cutting tool 1 is moved away from the workpiece 601 by moving it in the Y2 direction while the workpiece 601 is rotating.
[0101] In the cutting process of the manufacturing method of this embodiment, the cutting tool 1 is moved in each step, causing the cutting tool 1 to come into contact with the workpiece 601 or to move away from the workpiece 601, but of course, the method is not limited to this.
[0102] For example, in step (1), the workpiece 601 may be brought closer to the cutting tool 1. Alternatively, for example, in step (3), the workpiece 601 may be moved away from the cutting tool 1. If the cutting process is to be continued, the workpiece 601 can be kept rotating, and the process of bringing the cutting edge of the insert 200 into contact with a different location on the workpiece 601 can be repeated.
[0103] Typical examples of materials used for machining include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.
[0104] The inventions described in this disclosure have been explained above based on the drawings and embodiments. However, the inventions described in this disclosure are not limited to the embodiments described above. That is, the inventions described in this disclosure can be modified in various ways within the scope shown in this disclosure, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the inventions described in this disclosure. In other words, it should be noted that it is easy for those skilled in the art to make various modifications or alterations based on this disclosure. Furthermore, it should be noted that these modifications or alterations are included in the scope of this disclosure.
[0105] 1...Cutting tool 100...Holder 100a...First end 100b...Second end 101...Head 103...Shank 105...First end face 107...Pocket 109...Side 109a...Upper side 109b...Lower side 109c...First side 109d...Second side 111...First hole 113...Second hole 113a...First thread groove 115...Third hole 115a...Second thread groove 200...Insert 201...Top surface 203...Bottom surface 205...Side surface 205a...First side surface 205b...Second side surface 207...Through hole 300...Clamping member 301...Main body 303...Protrusion 305...Recess 307...Notch 309...Protrusion 400...Fixing member 401...First tip 403...First thread 403a...First thread 405...First rear end 500...Stopping member 501...Second tip 503...Second rear end (rear end) 505...Second thread 601...Workpiece L1...First central axis L2...Second central axis L3...Third central axis W1...First width
Claims
It is a rod shape extending from the first end to the second end, The first end face located on the side of the first end, A first side surface extending from the first end face toward the second end, The second side located opposite the first side, A pocket connected to the first end face and the second side face, The upper surface located between the first side surface and the pocket, The lower surface located on the opposite side of the upper surface, A first hole extending along the first central axis from the first end face toward the second end and opening toward the pocket, A holder having a second hole extending from the first side surface to the first hole along a second central axis inclined with respect to the first central axis, The insert located in the aforementioned pocket, The clamp member inserted into the first hole, The facility comprises a fixing member inserted into the second hole, The clamp member is The main body portion extending along the first central axis, It has a projection extending from the main body toward the insert, The main body portion has a recess, The recess opens toward the second hole, and its inner diameter decreases as it moves away from the second hole. The fixing member has a first tip portion that can be inserted into the recess, The outer diameter of the first tip decreases as it moves away from the second hole. In the planar perspective view from the upper side, the second central axis is a cutting tool that passes through the projection and the fixing member. In a planar perspective view from the upper side, the second central axis is located away from the center of the recess, as described in claim 1. The cutting tool according to claim 1 or 2, wherein, in a planar perspective view from the upper side, the second central axis is located closer to the second end than to the center of the recess. In a planar perspective view from the side of the first end face, the second central axis is located closer to the lower surface than the center of the recess, according to any one of claims 1 to 3. The cutting tool according to any one of claims 1 to 4, wherein the first hole is inclined to move away from the second side surface as it moves away from the first end face. The cutting tool according to any one of claims 1 to 5, wherein the first hole is inclined to move away from the upper surface as it moves away from the first end face. The fixing member further has a first threaded portion located closer to the first side surface than the first tip portion, The cutting tool according to any one of claims 1 to 6, wherein the first threaded portion is screwed into the second hole. The holder has a third hole extending from the first side surface to the first hole, The cutting tool further comprises a stopper inserted into the third hole, The aforementioned fastening member is The second tip portion is inserted into the third hole and protrudes toward the first hole, A cutting tool according to any one of claims 1 to 7, comprising a rear end portion located closer to the first side surface than the second tip portion and having an outer diameter larger than the outer diameter of the second tip portion. The cutting tool according to claim 8, wherein, in a front view of the first side surface, the rear end overlaps the second hole. The cutting tool according to claim 8 or 9, wherein the fastening member is located between the second tip and the rear end and further has a second threaded portion that is screwed into the third hole. The clamp member further has a protrusion extending from the main body toward the insert, The cutting tool according to any one of claims 1 to 10, wherein the convex portion is located closer to the first end than the projection portion. It is a rod shape extending from the first end to the second end, The first end face located on the side of the first end, A first side surface extending from the first end face toward the second end, The second side located opposite the first side, A pocket connected to the first end face and the second side face, The upper surface located between the first side surface and the pocket, The lower surface located on the opposite side of the upper surface, A first hole extending along the first central axis from the first end face toward the second end and opening toward the pocket, A holder having a second hole extending from the first side surface to the first hole along a second central axis inclined with respect to the first central axis, The insert located in the aforementioned pocket, The clamp member inserted into the first hole, The facility comprises a fixing member inserted into the second hole, The clamping member is movable in a direction along the first central axis and is capable of restraining the insert. The main body portion extending along the first central axis, It has a projection extending from the main body and capable of contacting the insert, The fixing member and the clamping member come into contact with each other, allowing the clamping member to move from the first end to the second end in a direction along the first central axis. In the planar perspective view from the upper side, the second central axis is a cutting tool that passes through the projection and the fixing member. The process of rotating the workpiece, A step of bringing a cutting tool according to any one of claims 1 to 12 into contact with the rotating workpiece, The process of removing the cutting tool from the workpiece, A method for manufacturing a machined workpiece, including the method described above.