Tool bit base body and tool bit

Abstract

The utility model discloses a tool bit base body and a tool bit. The tool bit base body is used for being installed on a tool handle. The tool bit base body comprises a tool bit main body, a mounting piece and a receding part. The tool bit body is provided with at least one spiral groove extending in the axial direction of the tool bit body in a surrounding mode, and the spiral groove is used for assembling a cutting edge used for cutting a workpiece to be machined. The mounting piece is connected with the tool bit main body and is provided with a connecting part detachably connected with the tool handle; the avoiding part is formed between the tool bit main body and the mounting piece, a clamping part is correspondingly arranged on the tool handle, and at least part of the clamping part is limited by the avoiding part. Compared with the prior art, the tool bit base body is convenient to disassemble and replace, the use cost is saved, and meanwhile the tool bit base body and the tool handle can be connected more tightly.

Description

Technical Field

[0001] This utility model relates to a tool head base and a tool head, belonging to the field of CNC milling. Background Technology

[0002] Existing milling cutter materials are mainly cemented carbide. However, during the machining process, the cutter head and the tool holder are often welded together to ensure a tight connection. This reduces the runout of the cutter head and ensures its stability during milling.

[0003] However, this means that the tool holder must be replaced every time the cutter head is changed, resulting in excessively high production costs and a significant burden for manufacturers. On the other hand, if the cutter head and tool holder are designed to be detachable, the cutter head may detach or the connection between the cutter head and tool holder may break during milling operations. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a cutter head base that is easy to disassemble and replace, saves on usage costs, and at the same time makes the connection between the cutter head base and the cutter handle tighter.

[0005] The technical solution of this utility model is:

[0006] A tool tip base for mounting to a tool holder, comprising:

[0007] The cutter head body is provided with at least one spiral groove that extends around the axial direction of the cutter head body, and the spiral groove is for assembling a cutting edge for cutting the workpiece being machined;

[0008] The mounting component is connected to the cutter head body and has a connecting portion for detachable connection with the cutter handle;

[0009] An avoidance portion is formed between the cutter head body and the mounting member, and a corresponding locking portion is provided on the cutter shank, the locking portion being at least partially restricted by the avoidance portion.

[0010] As a further improvement of this utility model, a groove is provided on the side of the cutter head body facing the mounting member, the connecting surface of the mounting member and the cutter head body is located in the groove, and the clearance portion is formed between the mounting member and the groove.

[0011] As a further improvement of this utility model, the groove is further provided with an extension portion that extends toward and is connected to the mounting member. In the extension direction from the blade body toward the mounting member, the extension portion gradually extends toward the inner wall of the groove and together with the groove forms the avoidance portion.

[0012] As a further improvement of this utility model, on the cross section extending from the cutter head body toward the mounting member, the clearance portion has a first clearance portion formed on the inner wall surface of the groove and connected to the cutter head body, and a second clearance portion formed on the outer wall surface of the extension portion and connecting the first clearance portion and the mounting member, wherein the second clearance portion is an arc surface recessed toward the cutter head body.

[0013] As a further improvement of this utility model, the line connecting the first clearance portion and the outer peripheral surface of the cutter head body is defined as the first line, the distance between the tangent of the second clearance portion parallel to the first line and the first line is defined as the first distance, the extension line of the end of the second clearance portion connected to the mounting member that is perpendicular to the first line is defined as the second line, the distance between the tangent of the second clearance portion parallel to the second line and the second line is defined as the second distance, and the first distance is greater than the second distance.

[0014] As a further improvement of this utility model, a connecting member is provided between the extension and the mounting member. The connecting member extends away from the axis of the cutter head base, and the outer wall surface of the connecting member constitutes a third clearance portion connecting the second clearance portion and the mounting member.

[0015] As a further improvement of this utility model, the first avoidance part and the third avoidance part are straight surfaces, and the included angle between the extension lines of the first avoidance part and the third avoidance part is between 25° and 35°.

[0016] As a further improvement of this utility model, the knife handle is provided with a fixing part adapted to the connecting part, and the mounting member is configured to be detachably inserted into the knife handle and fixedly connected with the cooperation of the connecting part and the fixing part.

[0017] As a further improvement of this utility model, the connecting part is a first threaded part provided on the outer peripheral surface of the mounting part, and the fixing part is a second threaded part adapted to the first threaded part.

[0018] As a further improvement of this utility model, the mounting component also includes a mating part that connects the cutter head body and the connecting part, and a corresponding fitting part adapted to the mating part is provided inside the cutter handle, wherein the outer wall surface of the mating part is an inclined surface that contracts axially toward the mounting component.

[0019] This utility model also discloses a cutting head that is easy to disassemble and replace, saving usage costs, and at the same time enabling a tighter connection between the cutting head and the handle.

[0020] The technical solution of this utility model is:

[0021] A cutting head for mounting to a cutting shank, comprising:

[0022] The cutting part has at least one threaded groove extending helically along the axial direction of the cutter head and a cutting edge fitted in the threaded groove;

[0023] The mounting component is connected to the cutting part and has a connecting part for detachable connection with the tool holder;

[0024] An avoidance portion is formed between the cutting portion and the mounting member, and a corresponding locking portion is provided on the tool holder, the locking portion being at least partially restricted by the avoidance portion.

[0025] As a further improvement of this utility model, the threaded groove has at least two, and a chip removal groove is formed between the two threaded grooves.

[0026] As a further improvement of this utility model, the cutting part has a cutting end, and the chip removal groove includes a first chip removal groove disposed near the cutting end and a second chip removal groove connecting the two threaded grooves, wherein the first chip removal groove is recessed in the second chip removal groove.

[0027] As a further improvement of this utility model, the first chip removal groove includes a first chip removal surface located at least partially at the cutting end, and a second chip removal surface connecting the first chip removal surface and the second chip removal groove, wherein the first chip removal surface and the second chip removal surface form an angle.

[0028] As a further improvement of this utility model, both the first chip removal surface and the second chip removal surface are inclined surfaces.

[0029] As a further improvement of this utility model, a groove is provided on the side of the cutting part facing the mounting member, and an extension part is also provided in the groove, extending towards the mounting member and connected to the mounting member. In the extension direction from the cutting part towards the mounting member, the extension part gradually extends towards the inner wall of the groove and together with the groove forms the clearance part.

[0030] As a further improvement of this utility model, in the cross section extending from the cutting portion toward the mounting member, the clearance portion has a first clearance portion formed on the inner wall surface of the groove and connected to the cutting portion, and a second clearance portion formed on the outer wall surface of the extension portion and connecting the first clearance portion and the mounting member, wherein the second clearance portion is an arc surface recessed toward the cutting portion.

[0031] As a further improvement of this utility model, the line connecting the outer peripheral surfaces of the first clearance portion and the cutting portion is defined as the first line, the distance between the tangent of the second clearance portion parallel to the first line and the first line is defined as the first distance, the extension line of the end of the second clearance portion connected to the mounting member that is perpendicular to the first line is defined as the second line, the distance between the tangent of the second clearance portion parallel to the second line and the second line is defined as the second distance, and the first distance is greater than the second distance.

[0032] As a further improvement of this utility model, the knife handle is provided with a fixing part adapted to the connecting part, and the mounting member is configured to be detachably inserted into the knife handle and fixedly connected with the cooperation of the connecting part and the fixing part.

[0033] As a further improvement of this utility model, the connecting part is a first threaded part provided on the outer peripheral surface of the mounting part, and the fixing part is a second threaded part adapted to the first threaded part.

[0034] As a further improvement of this utility model, the first threaded portion and the second threaded portion are one of triangular threads and T-type threads.

[0035] As a further improvement of this utility model, a transition portion is provided between the cutting part and the mounting part, and at least one part to be used is provided on the transition portion. The part to be used is configured to cooperate with an external tool to drive the cutter head to rotate by external force.

[0036] The beneficial technical effects of this utility model are as follows: The cutter head base of this utility model is provided with a mounting component that connects the cutter head body and the cutter handle, and the mounting component has a connecting part that can be detachably connected to the cutter handle, which makes the cutter head base easier to disassemble and replace, saving usage costs; In addition, by providing a clearance part between the cutter head body and the mounting component, the insertion part of the cutter handle is at least partially restricted by the clearance part, so as to further ensure the stability of the connection between the cutter head base and the cutter handle and avoid breakage during use. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the cutter head base conforming to a preferred embodiment of the present utility model.

[0038] Figure 2 yes Figure 1 A schematic diagram of the structure of the cutter head base from another angle.

[0039] Figure 3 yes Figure 1 Cross-sectional view of the cutter head substrate.

[0040] Figure 4 yes Figure 3Enlarged view of the circle with the middle dashed line.

[0041] Figure 5 yes Figure 1 A cross-sectional view of another embodiment of the cutter head substrate.

[0042] Figure 6 yes Figure 1 The diagram shows the combined structure of the cutter head base and the cutter shank.

[0043] Figure 7 yes Figure 6 A schematic diagram of the middle tool holder.

[0044] Figure 8 This is a cross-sectional view of the blade head conforming to a preferred embodiment of the present utility model. Detailed Implementation

[0045] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0046] Please see Figures 1 to 8 As shown, this utility model discloses a blade tip base 100 for mounting to a blade holder 200, including a blade tip body 1 and a mounting member 2. The mounting member 2 connects the blade tip body 1 and the blade holder 200, and has a connecting portion 21 connected to the blade tip body 1 and for detachable connection to the blade holder 200. The blade holder 200 has a fixing portion 210 adapted to the connecting portion 21. The mounting member 2 is configured to be detachably inserted into the blade holder 200 and fixedly connected by the cooperation of the connecting portion 21 and the fixing portion 210.

[0047] Preferably, the connecting portion 21 is a first threaded portion disposed on the outer peripheral surface of the mounting member 2, and the fixing portion 210 is a second threaded portion adapted to the first threaded portion. This arrangement allows the cutter head base 100 and the tool holder 200 to be detachably connected, facilitating timely replacement and disassembly. The cutter head base 100 of this invention is a round bar shape, meaning that once the cutter head base 100 is machined into a cutter head 300, it can be quickly replaced, unlike existing milling cutters where the tool holder 200 needs to be replaced simultaneously with the cutter head 300, saving costs and avoiding waste. Of course, other connection methods can be adopted in other embodiments, as long as detachability is ensured; there are no limitations on this. Preferably, the first threaded portion and the second threaded portion are either triangular threads or T-shaped threads. Preferably, this connection method can be applied to the cutter body base 100, the machined cutter head 300, or milling cutters, drill bits, and other corresponding structures to achieve detachable connection.

[0048] Specifically, the cutter head body 1 has at least one spiral groove 10 extending circumferentially along the axial direction of the cutter head body 1. The spiral groove 10 is for mounting a cutting edge 11 for cutting the workpiece. The cutting edge 11 is preferably made of diamond, and includes polycrystalline diamond, polycrystalline diamond, cubic boron nitride, and other materials; it is mounted in the spiral groove 10 in an inlay manner. Of course, in other embodiments, the cutting edge 11 can be made of other materials with the same hardness. The spiral groove 10 is preferably 4, but it can also be 2, 3, or more, and there is no limitation thereto. After machining, when there are multiple spiral grooves 10, adjacent spiral grooves 10 are connected by a chip removal groove 16 for chip removal. Preferably, the cutter head body 1, the cutting edge 11, and the mounting member 2 are all made of different materials.

[0049] The spiral groove 10 extends and is partially located at one end of the cutter head body 1 opposite to the shank 200, and a transition surface 101 is formed on the side near the mounting member 2. The transition surface 101 is used to cooperate in fixing the cutting edge 11.

[0050] A transition portion 12 is provided between the spiral groove 10 of the cutter head body 1 and the mounting member 2. The transition portion 12 is provided with at least one unused portion 121. The unused portion 121 is preferably an unused groove, which is used to lock the cutter head body 1 with an external tool to rotate the cutter head body 1, so that the first threaded portion and the second threaded portion are tightened or unlocked, that is, the installation, fixing and replacement of the cutter head base 100 and the cutter handle 200 can be realized.

[0051] The mounting component 2 also includes a mating part 22 that connects the cutter head body 1 and the connecting part 21. The handle 200 is provided with a corresponding fitting part 230 that is adapted to the mating part 22. The outer wall surface of the mating part 22 is an inclined surface that shrinks axially toward the mounting component 2. The fitting part 230 is the inclined surface adapted to the mating part 22.

[0052] In this embodiment, the mating part 22 is used to cooperate with the connecting part 21 to fix the knife handle 200. That is, when the mounting part 2 is inserted into the knife handle 200, while the first threaded part and the second threaded part are screwed and locked, the inclined surface of the mating part 22 and the inclined surface of the mating part 230 fit together, so that the connection between the mounting part 2 and the knife handle 200 is tighter and avoids falling off during use.

[0053] The cutter head base 100 also includes a clearance portion 3 formed between the cutter head body 1 and the mounting member 2. The handle 200 has a corresponding locking portion 210, which is at least partially restricted by the clearance portion 3. In other words, the locking portion 210 is a protrusion extending towards the axis of the handle 200. Through the cooperation of the locking portion 210 and the clearance portion 3, the handle 200 is further brought into close contact with the cutter head base 100, increasing stability. That is, the cutter head base 100 and the handle 200 achieve triple stability, enabling this detachable connection to achieve strength comparable to welding. Furthermore, when the clearance portion 3 is not provided, the mounting member 2 will be worn down by the locking portion 210, potentially causing breakage. When the clearance portion 3 and the mating portion 22 are not provided, i.e., when the outer periphery of the mounting member 2 is threaded, these threads will be worn down by the locking portion 210.

[0054] Specifically, the blade body 1 has a groove 13 on the side facing the mounting member 2. The connecting surface between the mounting member 2 and the blade body 1 is located within the groove 13, and the clearance portion 3 is formed between the mounting member 2 and the groove 13. The groove 13 also has an extension portion 14 extending towards and connected to the mounting member 2. In the direction extending from the blade body 1 towards the mounting member 2, the extension portion 14 gradually extends towards the inner wall of the groove 13, and together with the groove 13, forms the clearance portion 3.

[0055] On a cross section extending from the cutter head body 1 toward the mounting member 2, the clearance portion 3 has a first clearance portion 31 formed on the inner wall surface of the groove 13 and connected to the cutter head body 1, and a second clearance portion 32 formed on the outer wall surface of the extension portion 14 and connecting the first clearance portion 31 and the mounting member 2. The second clearance portion 32 is an arc surface recessed toward the cutter head body 1.

[0056] The line connecting the first clearance portion 31 and the outer peripheral surface of the cutter head body 1 is defined as the first connecting line. The distance between the tangent of the second clearance portion 32 parallel to the first connecting line and the first connecting line is defined as the first distance a. The extension line of the end of the second clearance portion 32 connected to the mounting member 2 perpendicular to the first connecting line is defined as the second connecting line. The distance between the tangent of the second clearance portion 32 parallel to the second connecting line and the second connecting line is defined as the second distance b. The first distance a is greater than the second distance b. Thus, by designing the first distance a to be greater than the second distance b, the length of the first connecting line is longer. This allows the force generated by the locking portion 210 within the clearance portion 3 during operation of the cutter head base 100 to be more diverted along the direction of the first connecting line by the inner wall surface of the groove 13, rather than being applied to the extension portion 14, thus preventing the extension portion 14 from breaking.

[0057] In this invention, a connecting member 15 is further provided between the extension 14 and the mounting member 2. The connecting member 15 extends away from the axis of the cutter head base 100, and the outer wall surface of the connecting member 15 forms a third clearance portion 33 connecting the second clearance portion 32 and the mounting member 2. In this case, the second connecting line is an extension line formed at the end where the connecting member 15 connects to the mounting member 2 and is perpendicular to the first connecting line. The distance between this extension line and the tangent line of the second clearance portion 32 parallel to the second connecting line forms a second distance b. Generally, the ratio of the first distance a to the second distance b is preferably 2:1, 3:1, 4:1, etc., and can be adjusted according to actual conditions, as long as the first distance a is greater than the second distance b.

[0058] Preferably, the first clearance portion 31 and the third clearance portion 33 are perpendicular, and the angle between the extension lines of the first clearance portion 31 and the third clearance portion 33 is between 25° and 35°. This angle is preferably 29°, 30°, or 31°. If the angle is too large, force cannot be released, and the extension portion 14 will easily concentrate force; if the angle is too small, the locking portion 210 cannot lock into the clearance portion 3, thus failing to ensure the secure fixing of the blade base 100 and the handle 200.

[0059] Please combine Figure 8As shown, this utility model also discloses a cutting head 300, which is used to be installed on the tool holder 200 and detachably connected to the tool holder 200. The cutting head 300 is machined and ground from the cutting head base 100. The cutting head 300 includes a cutting portion 4, a mounting member 2, and a clearance portion 3 formed between the cutting portion 4 and the mounting member 2. Because the cutting head 300 only involves machining the cutting head base 100, the structures of the mounting member 2 and the clearance portion 3 remain unchanged, and therefore can be referred to the preceding text, without further elaboration.

[0060] The cutting section 4 has at least one threaded groove 10 extending helically along the axial direction of the cutter head 300 and a cutting edge 11 fitted within the threaded groove 10. In this embodiment, there are at least two threaded grooves 10, and the chip removal groove 16 is formed between the two threaded grooves 10. This ensures that the cutting chips are discharged.

[0061] Preferably, the cutting part 4 has a cutting end 41, and the chip removal groove 16 includes a first chip removal groove 161 disposed near the cutting end 41 and a second chip removal groove 162 connecting the two threaded grooves 10, wherein the first chip removal groove 161 is recessed in the second chip removal groove 162.

[0062] In this embodiment, the first chip removal groove 161 includes a first chip removal surface 1611 at least partially located on the cutting end 41, and a second chip removal surface 1612 connecting the first chip removal surface 1611 and the second chip removal groove 162. The first chip removal surface 1611 and the second chip removal surface 1612 form an angle, and both the first chip removal surface and the second chip removal surface are inclined surfaces. Therefore, the first chip removal groove 161 is constructed from two inclined surfaces to guide the cutting chips into the second chip removal groove 162 for discharge, or allow them to flow directly out from the first chip removal groove 161. In the axial direction of the cutting head 300, both the first chip removal surface 1611 and the second chip removal surface 1612 extend obliquely close to the axis of the cutting head 300 to guide the cutting chips into the second chip removal groove 162 for discharge.

[0063] The cutting portion 4 has a groove 13 on the side facing the mounting member 2. An extension portion 14 extends towards and connects to the mounting member 2 within the groove 13. In the direction of extension from the cutting portion 4 towards the mounting member 2, the extension portion 14 gradually extends towards the inner wall of the groove 13, forming the clearance portion 3 together with the groove 13. In this embodiment, the extension portion 14 can be an independent component, or it can be integrally formed with the tool body base 100 (which is not destroyed after the tool head base 100 is machined into the tool head 300) or the mounting member 2.

[0064] A transition portion 12 is further provided between the cutting portion 4 and the mounting member 2. The transition portion 12 has at least one usable portion 121, which is configured to cooperate with an external tool to drive the cutter head 300 to rotate via external force. Preferably, the usable portion 121 is a usable groove. In this embodiment, the transition portion 12 is part of the cutter head base 100, that is, the cutting portion 4 is formed on the side of the cutter head base 100 that is machined away from the transition portion 12.

[0065] In summary, the blade base 100 of this utility model, by providing a mounting member 2 connecting the blade body 1 and the handle 200, and the mounting member 2 having a connecting part 21 detachably connected to the handle 200, makes the blade base 100 easier to disassemble and replace, saving usage costs. In addition, by providing a clearance part 3 between the blade body 1 and the mounting member 2, the locking part 210 of the handle 200 is at least partially restricted by the clearance part 3, thereby further ensuring the stability of the connection between the blade base 100 and the handle 200 and preventing breakage during use. The cutting head 300 of this utility model is provided with a mounting member 2 that connects the cutting part 4 and the tool holder 200. The mounting member 2 has a connecting part 21 that is detachably connected to the tool holder 200, which makes the cutting head 300 easier to disassemble and replace, saving usage costs. In addition, by providing a clearance part 3 between the cutting part 4 and the mounting member 2, the locking part 210 of the tool holder 200 is at least partially restricted by the clearance part 3, so as to further ensure the stability of the connection between the cutting head 300 and the tool holder 200 and avoid breakage during use.

[0066] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A cutter head base for mounting to a cutter shank, characterized in that, include: The cutter head body is provided with at least one spiral groove that extends around the axial direction of the cutter head body, and the spiral groove is for assembling a cutting edge for cutting the workpiece being machined; The mounting component is connected to the cutter head body and has a connecting portion for detachable connection with the cutter handle; An avoidance portion is formed between the cutter head body and the mounting member, and a corresponding locking portion is provided on the cutter shank, the locking portion being at least partially restricted by the avoidance portion.

2. The cutter head base according to claim 1, characterized in that, The blade body has a groove on the side facing the mounting member, the connecting surface of the mounting member and the blade body is located in the groove, and the clearance portion is formed between the mounting member and the groove.

3. The cutter head base according to claim 2, characterized in that, The groove is further provided with an extension portion that extends toward and is connected to the mounting member. In the extension direction from the cutter head body toward the mounting member, the extension portion gradually extends toward the inner wall of the groove and together with the groove forms the clearance portion.

4. The cutter head base according to claim 3, characterized in that, On a cross section extending from the cutter body toward the mounting member, the clearance portion has a first clearance portion formed on the inner wall of the groove and connected to the cutter body, and a second clearance portion formed on the outer wall of the extension portion and connecting the first clearance portion and the mounting member, wherein the second clearance portion is an arcuate surface recessed toward the cutter body.

5. The cutter head base according to claim 4, characterized in that, The line connecting the first clearance portion and the outer peripheral surface of the cutter head body is defined as the first line. The distance between the tangent of the second clearance portion parallel to the first line and the first line is defined as the first distance. The extension line of the end of the second clearance portion connected to the mounting member that is perpendicular to the first line is defined as the second line. The distance between the tangent of the second clearance portion parallel to the second line and the second line is defined as the second distance. The first distance is greater than the second distance.

6. The cutter head base according to claim 4, characterized in that, A connecting member is also provided between the extension and the mounting member. The connecting member extends away from the axis of the cutter head base, and the outer wall surface of the connecting member forms a third clearance portion connecting the second clearance portion and the mounting member.

7. The cutter head base according to claim 6, characterized in that, The first clearance portion and the third clearance portion are on the same plane, and the angle between the extension lines of the first clearance portion and the third clearance portion is between 25º and 35º.

8. The cutter head base according to claim 1, characterized in that, The tool holder has a fixing part adapted to the connecting part, and the mounting part is configured to be detachably inserted into the tool holder and fixedly connected with the connecting part and the fixing part.

9. The cutter head base according to claim 8, characterized in that, The connecting part is a first threaded part provided on the outer peripheral surface of the mounting part, and the fixing part is a second threaded part adapted to the first threaded part.

10. The cutter head base according to claim 8, characterized in that, The mounting component also includes a mating part that connects the cutter head body and the connecting part. The cutter handle is provided with a corresponding fitting part that adapts to the mating part. The outer wall surface of the mating part is an inclined surface that contracts axially toward the mounting component.

11. A cutting head for mounting to a cutting shank, characterized in that, include: The cutting part has at least one threaded groove extending helically along the axial direction of the cutter head and a cutting edge fitted in the threaded groove; The mounting component is connected to the cutting part and has a connecting part for detachable connection with the tool holder; An avoidance portion is formed between the cutting portion and the mounting member, and a corresponding locking portion is provided on the tool holder, the locking portion being at least partially restricted by the avoidance portion.

12. The cutting head according to claim 11, characterized in that, The threaded grooves are at least two, and a chip removal groove is formed between the two threaded grooves.

13. The cutting head according to claim 12, characterized in that, The cutting part has a cutting end, and the chip removal groove includes a first chip removal groove disposed near the cutting end and a second chip removal groove connecting the two threaded grooves, wherein the first chip removal groove is recessed in the second chip removal groove.

14. The cutting head according to claim 13, characterized in that, The first chip removal groove includes a first chip removal surface located at least partially at the cutting end, and a second chip removal surface connecting the first chip removal surface and the second chip removal groove, wherein the first chip removal surface and the second chip removal surface form an angle.

15. The cutting head according to claim 14, characterized in that, Both the first chip removal surface and the second chip removal surface are inclined surfaces.

16. The cutting head according to claim 11, characterized in that, The cutting part has a groove on the side facing the mounting member. The groove also has an extension that extends toward and connects to the mounting member. In the extension direction from the cutting part toward the mounting member, the extension gradually extends toward the inner wall of the groove and together with the groove forms the clearance part.

17. The cutting head according to claim 16, characterized in that, In a cross section extending from the cutting portion toward the mounting member, the clearance portion has a first clearance portion formed on the inner wall surface of the groove and connected to the cutting portion, and a second clearance portion formed on the outer wall surface of the extension portion and connecting the first clearance portion and the mounting member, wherein the second clearance portion is an arcuate surface recessed toward the cutting portion.

18. The cutting head according to claim 17, characterized in that, The line connecting the outer peripheral surfaces of the first clearance portion and the cutting portion is defined as the first line. The distance between the tangent of the second clearance portion parallel to the first line and the first line is defined as the first distance. The extension line of the end of the second clearance portion connected to the mounting member that is perpendicular to the first line is defined as the second line. The distance between the tangent of the second clearance portion parallel to the second line and the second line is defined as the second distance. The first distance is greater than the second distance.

19. The cutting head according to claim 18, characterized in that, The tool holder has a fixing part adapted to the connecting part, and the mounting part is configured to be detachably inserted into the tool holder and fixedly connected with the connecting part and the fixing part.

20. The cutting head according to claim 19, characterized in that, The connecting part is a first threaded part provided on the outer peripheral surface of the mounting part, and the fixing part is a second threaded part adapted to the first threaded part.

21. The cutting head according to claim 20, characterized in that, The first threaded portion and the second threaded portion are either triangular threads or T-type threads.

22. The cutting head according to claim 11, characterized in that, A transition section is provided between the cutting part and the mounting part. The transition section is provided with at least one part to be used. The part to be used is configured to cooperate with an external tool to drive the cutter head to rotate by external force.

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