Modular cutting tool with dual resilient clamping

Abstract

The application discloses a modular cutting tool with double elastic clamping, which comprises a clamping component and a cutting component installed on the clamping component, the clamping component comprises a clamping handle and a clamping head, the cutting component comprises a cutting head and a cutting tail, a clamping protrusion is arranged on the front end surface of the clamping head, the clamping protrusion comprises a cylindrical platform and an external thread arranged in sequence, a clamping recess is arranged on the clamping end surface of the cutting tail, the clamping recess comprises a cylindrical recess, an internal thread and a bottom recess arranged in sequence, when the clamping protrusion is completely entered into the clamping recess through cooperation of the external thread and the internal thread, the clamping end surface and the front end surface are axially positioned and clamped through abutting cooperation to realize axial positioning and clamping of the cutting component, the cylindrical platform and the external thread away from the clamping handle are respectively in contact with the cylindrical recess and the bottom recess through elastic deformation to realize radial double interference clamping of the cutting component. The application has the advantages of good connection strength and rigidity, high cutting efficiency, long service life and stable cutting.

Description

Technical Field

[0001] This invention relates primarily to the field of metal cutting, and more particularly to a modular cutting tool with dual elastic clamping. Background Technology

[0002] In the machining process, only the cutting part of the cutting tool participates in cutting, while the clamping shank does not participate in cutting. In order to avoid damage to the cutting part and scrap the entire cutting tool, and to extend the service life of the cutting tool, the cutting part and the clamping shank of the cutting tool are usually set up independently in the prior art. The cutting part and the clamping shank are connected by ordinary threads or other means to realize the repeated loading and unloading of the cutting part on the clamping shank.

[0003] However, with the rapid development of the manufacturing industry, the length-to-diameter ratio of cutting tools is constantly increasing, thus placing higher demands on the strength and rigidity of the tools. To ensure that the performance of modular cutting tools approaches that of integral tools, the tools can be made of cemented carbide or materials with properties similar to cemented carbide. Simultaneously, to allow for quick assembly and disassembly of the cutting components onto the clamping components, a threaded connection is generally used to connect the cutting components and the clamping components. The clamping components have cylindrical and end faces at their ends that mate with the cutting components, thereby limiting the center and end faces of the cutting components and ensuring the axial and radial positioning accuracy and strength of the cutting components. This connection method allows for high-strength, rapid assembly and disassembly of the cutting components and has a simple structure. However, this type of cutting tool has poor radial rigidity and strength. During side milling and other cutting operations with high radial loads, the cutting vibration generated by the tool head is significant, affecting machining accuracy and reducing the tool's service life. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a modular cutting tool with dual elastic clamping that has good connection strength and rigidity, high cutting efficiency, long service life and stable cutting.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A modular cutting tool with dual elastic clamping includes a clamping component and a cutting component mounted on the clamping component. The clamping component includes a clamping shank and a clamping head. The cutting component includes a cutting head and a cutting tail. The front end face of the clamping head is provided with a clamping protrusion, which includes a cylindrical platform and an external thread arranged sequentially. The clamping end face of the cutting tail is provided with a clamping recess, which includes a cylindrical recess, an internal thread, and a bottom recess arranged sequentially. When the clamping protrusion is fully inserted into the clamping recess through the engagement of the external thread and the internal thread, the clamping end face and the front end face achieve axial positioning and clamping of the cutting component through abutment engagement. The cylindrical platform and the external thread away from the clamping shank respectively contact the cylindrical recess and the bottom recess through elastic deformation to achieve radial dual interference clamping of the cutting component.

[0007] As a further improvement to the above technical solution:

[0008] Both the clamping protrusion and the clamping recess are symmetrical about the rotation center axis of the modular cutting tool.

[0009] The concave cone angle of the bottom is θ1, which should satisfy: 0°≤θ1≤1°.

[0010] The diameter of the cylindrical recess is D, and the diameter of the cylindrical platform is d, which should satisfy: -0.02mm≤Dd≤0.02mm.

[0011] The outer diameter of the external thread is d1, and the lead of the external thread is P, which should satisfy: 0.3d1≤P≤0.8d1.

[0012] The bottom recess is formed on the inner bottom surface of the internal thread, and the diameter of the circle where the bottom recess intersects the inner bottom surface is D1, which should satisfy: 0≤d1-D1≤0.02mm.

[0013] The internal thread has an internal transition surface at the beginning, located between the internal crest and the internal root. The internal transition surface includes an internal variable diameter surface and an internal equal diameter surface. The external thread has an external transition surface at the beginning, located between the external crest and the external root. The external transition surface includes an external variable diameter surface and an external equal diameter surface. The internal crest at the intersection of the internal thread and the internal transition surface has a complete width, while the internal root has an incomplete width. The external crest at the intersection of the external thread and the external transition surface has a complete width, while the external root has an incomplete width.

[0014] The inner transition surface has an inner variable diameter surface and an inner equal diameter surface that are tangent concave cylindrical surfaces. The inner equal diameter surface and the internal thread are concentric. The outer transition surface has an outer variable diameter surface and an outer equal diameter surface that are tangent convex and concave cylindrical surfaces, respectively. The outer equal diameter surface and the external thread are concentric.

[0015] Compared with the prior art, the advantages of the present invention are as follows:

[0016] (1) The modular cutting tool of the present invention with dual elastic clamping has a cylindrical platform and an external thread away from the clamping shank that are in corresponding contact with the cylindrical recess and the bottom recess through elastic deformation, respectively, to achieve radial dual interference clamping of the cutting part. The internal thread and the external thread are in contact, and the front end face of the clamping part and the clamping end face of the cutting part are in contact to achieve axial dual interference clamping of the cutting part. The clamping part achieves dual interference clamping of the cutting part in both the axial and radial directions, which greatly improves the positioning strength and accuracy of the cutting part, and improves the machining accuracy and cutting efficiency. The threaded engagement can achieve a true interference fit. The bottom recess is in contact with part of the external thread, and the space of the external thread in the non-contact area can greatly accommodate the wear waste particles generated by each metal wall. In addition, the cutting part is a consumable part. The internal thread, cylindrical recess and bottom recess of the cutting part can reduce the material cost of the cutting part, reduce the consumption of cemented carbide, and reduce the use cost of the modular cutting tool.

[0017] (2) The modular cutting tool with dual elastic clamping of the present invention can accurately design the elasticity of the conical and cylindrical surfaces between the clamping and cutting components, ensuring that the conical and cylindrical surfaces are in full contact with the cylindrical platform and part of the external thread of the clamping part, greatly improving the clamping rigidity of the cutting component, effectively reducing the deformation between the interface of the clamping and cutting components, thereby increasing the maximum overhang ratio and cutting life of the cutting component, and the cutting depth can be increased by more than 100%. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the modular cutting tool with dual elastic clamping according to the present invention.

[0019] Figure 2 This is a front view of the modular cutting tool with dual elastic clamping according to the present invention.

[0020] Figure 3 yes Figure 2 AA view in the middle.

[0021] Figure 4 This is a three-dimensional structural diagram of the cutting tail of the modular cutting tool with dual elastic clamping according to the present invention.

[0022] Figure 5 This is a three-dimensional structural diagram of the clamping head of the modular cutting tool with dual elastic clamping according to the present invention.

[0023] Figure 6 This is a front view of the clamping head of the modular cutting tool with dual elastic clamping according to the present invention.

[0024] The labels in the diagram represent:

[0025] 1. Clamping component; 11. Clamping shank; 12. Clamping head; 121. Clamping protrusion; 122. External thread; 1221. External thread crest; 1222. External thread root; 1223. External transition surface; 12231. External diameter changing surface; 12232. External equal diameter surface; 1225. External end face; 123. Cylindrical platform; 13. Front end face; 2. Cutting component; 21. Cutting head; 22. Cutting tail; 221. Clamping recess; 222. Internal thread; 2221. Internal thread crest; 2222. Internal thread root; 2223. Internal transition surface; 22231. Internal diameter changing surface; 22232. Internal equal diameter surface; 2225. Internal bottom surface; 223. Cylindrical recess; 224. Bottom recess; 23. Clamping end face; 24. Central shaft. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "horizontal", "inner", "outer", "top", "bottom", etc., which indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0028] Figures 1 to 6This invention illustrates an embodiment of a modular cutting tool with dual elastic clamping. The modular cutting tool includes a clamping component 1 and a cutting component 2 mounted on the clamping component 1. The clamping component 1 includes a clamping shank 11 and a clamping head 12. The cutting component 2 includes a cutting head 21 and a cutting tail 22. A clamping protrusion 121 is provided on the front end face 13 of the clamping head 12. The clamping protrusion 121 includes a cylindrical platform 123 and an external thread 122 arranged sequentially. The clamping end face of the cutting tail 22... The 23 is provided with a clamping recess 221, which includes a cylindrical recess 223, an internal thread 222, and a bottom recess 224 arranged sequentially. When the clamping protrusion 121 is fully inserted into the clamping recess 221 through the engagement of the external thread 122 and the internal thread 222, the clamping end face 23 and the front end face 13 achieve axial positioning and clamping of the cutting component 2 through abutment engagement. The cylindrical platform 123 and the external thread 122 away from the clamping shank 11 respectively make corresponding contact with the cylindrical recess 223 and the bottom recess 224 through elastic deformation to achieve the clamping of the cutting component 2. The cutting component 2 is radially double-interference clamped. The cylindrical platform 123 and the external thread 122 away from the clamping shank 11 respectively engage with the cylindrical recess 223 and the bottom recess 224 through elastic deformation, achieving radial double-interference clamping of the cutting component 2. The front end face 13 of the clamping component 1 abuts against the clamping end face 23 of the cutting component 2, achieving axial double-interference clamping of the cutting component 2. The clamping component 1 simultaneously achieves axial and radial double-interference clamping of the cutting component 2, greatly improving the positioning strength of the cutting component. It improves precision and machining accuracy and cutting efficiency; the threaded engagement enables a true interference fit, and the bottom recess 224 contacts part of the external thread 122. The thread space of the external thread 122 in the non-contact area can greatly accommodate the wear waste particles generated by each metal wall; in addition, the cutting part 2 is a consumable part. The internal thread 222, cylindrical recess 223 and bottom recess 224 of the cutting part 2 can reduce the material cost of the cutting part 2, reduce the consumption of cemented carbide, and reduce the use cost of modular cutting tools.

[0029] In this embodiment, both the clamping protrusion 121 and the clamping recess 221 are symmetrical about the rotation center axis 24 of the modular cutting tool.

[0030] In this embodiment, the cone angle of the bottom recess 224 is θ1. To ensure that the bottom recess 224 is elastically deformed and the external thread 122 away from the clamping shank 11 is fully in contact, the clamping end face 13 of the clamping component 1 and the front end face 23 of the cutting component 2 can also be fully in contact. The following condition should be met: 0°≤θ1≤1°. In this embodiment, θ1=0.5°.

[0031] In this embodiment, the diameter of the cylindrical recess 223 is D, and the diameter of the cylindrical platform 123 is d. In order to improve the radial clamping stability of the cylindrical recess 223 and the cylindrical platform 123 between the cutting component 2 and the clamping component 1, the elasticity between the cylindrical recess 223 and the cylindrical platform 123 can be flexibly controlled according to the cutting conditions of the cutting component 2. It should satisfy: -0.02mm≤Dd≤0.02mm. In order to fully improve the rigidity and cutting efficiency of the cutting component 2, preferably, 0.003mm≤Dd≤0.02mm. In this embodiment, Dd=0.01mm.

[0032] In this embodiment, the outer diameter of the external thread 122 is d1, and the lead of the external thread 122 is P. In order to ensure that the clamping component 1 can complete the quick loading and unloading of the cutting component 2, the following condition should be met: 0.3d1≤P≤0.8d1. In this embodiment, P=0.3d1.

[0033] In this embodiment, the bottom recess 224 is formed on the inner bottom surface 2225 of the internal thread 222. The diameter of the circle where the bottom recess 224 and the inner bottom surface 2225 intersect is D1. In order to ensure the elastic effect between the bottom recess 224 and the outer diameter of the external thread 122 away from the clamping shank 11 and to improve the positioning rigidity, it should satisfy: 0≤d1-D1≤0.02mm. In this embodiment, d1-D1=0.01mm.

[0034] In this embodiment, the starting point of the internal thread 222 is provided with an internal transition surface 2223 located between the internal crest 2221 and the internal root 2222. The internal transition surface 2223 includes an internal variable diameter surface 22231 and an internal equal diameter surface 22232. The starting point of the external thread 122 is provided with an external transition surface 1223 located between the external crest 1221 and the external root 1222. The external transition surface 1223 includes an external variable diameter surface 12231 and an external equal diameter surface 12232. During the loading and unloading of the clamping component 1 and the cutting component 2, in order to To ensure good connection strength between the internal thread 222 and the external thread 122 of the cemented carbide material, and to effectively eliminate chipping of the internal tooth crest 2221 of the internal thread and the external tooth crest 1221 of the external thread, thereby improving the reliability of the interface, the internal tooth crest 2221 at the intersection of the internal thread 222 and the internal transition surface 2223 has a complete width while the internal tooth root 2222 has an incomplete width, and the external tooth crest 1221 at the intersection of the external thread 122 and the external transition surface 1223 has a complete width while the external tooth root 1222 has an incomplete width.

[0035] In this embodiment, in order to ensure that the outer dimensions of the inner transition surface 2223 and the outer transition surface 1223 on the clamping component 1 and the cutting component 2 are strictly controlled and to reduce the manufacturing difficulty, the inner variable diameter surface 22231 and the inner equal diameter surface 22232 of the inner transition surface 2223 are tangent concave cylindrical surfaces, and the inner equal diameter surface 22232 and the internal thread 222 are concentric. The outer variable diameter surface 12231 and the outer equal diameter surface 12232 of the outer transition surface 1223 are tangent convex cylindrical and concave cylindrical surfaces, respectively, and the outer equal diameter surface 12232 and the external thread 122 are concentric.

[0036] In the above embodiments, the module interface between the cutting tool clamping component 1 and the cutting component 2 adopts a double-headed, large-helix-angle thread structure with a large pitch, which makes disassembly and assembly quick and convenient, and improves the connection strength between the clamping component 1 and the cutting component 2. However, the present invention is not limited to this. Depending on the interface accuracy and size specifications of the clamping component 1 and the cutting component 2, the thread between the clamping component 1 and the cutting component 2 can also be designed as a single-headed, three-headed, or other threaded structure.

[0037] In the above embodiments, the external thread 122 on the clamping component 1 and the internal thread 222 on the cutting component 2 are straight lines, and the tooth angles on both sides are equal. The present invention is not limited to this. Depending on the process requirements and actual working conditions, the tooth shape can also be designed as an arc or other shapes. At the same time, the tooth shapes on both sides can be set to different shapes.

[0038] In the above embodiments, the modular cutting tool with dual elastic clamping is applied to rotary tools. However, the present invention is not limited to this. The use of this interface technology in non-rotary tool structures such as turning should be within the scope of the present invention.

[0039] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A modular cutting tool with dual elastic clamping, comprising a clamping component (1) and a cutting component (2) mounted on the clamping component (1), wherein the clamping component (1) comprises a clamping shank (11) and a clamping head (12), and the cutting component (2) comprises a cutting head (21) and a cutting tail (22), wherein a clamping protrusion (121) is provided on the front end face (13) of the clamping head (12), and a clamping recess (221) is provided on the clamping end face (23) of the cutting tail (22), characterized in that: The clamping protrusion (121) includes a cylindrical platform (123) and an external thread (122) arranged in sequence. The clamping recess (221) includes a cylindrical recess (223), an internal thread (222), and a conical bottom recess (224) arranged in sequence. When the cutting component (2) is installed into the clamping component (1), the clamping protrusion (121) is fully inserted into the clamping recess (221) through the cooperation of the external thread (122) and the internal thread (222). The clamping end face (23) and the front end face (13) abut against each other to achieve axial positioning and clamping of the cutting component (2). The ends of the cylindrical platform (123) and the external thread (122) away from the clamping shank (11) respectively make elastic deformation contact with the cylindrical recess (223) and the bottom recess (224) to achieve radial double interference clamping of the cutting component (2).

2. The modular cutting tool with dual elastic clamping according to claim 1, characterized in that: Both the clamping protrusion (121) and the clamping recess (221) are symmetrical about the rotation center axis (24) of the modular cutting tool.

3. The modular cutting tool with dual elastic clamping according to claim 2, characterized in that: The cone angle of the bottom recess (224) is θ1, which should satisfy: 0°≤θ1≤1°.

4. The modular cutting tool with dual elastic clamping according to claim 3, characterized in that: The diameter of the cylindrical recess (223) is D, and the diameter of the cylindrical platform (123) is d, which should satisfy: -0.02mm≤Dd≤0.02mm.

5. The modular cutting tool with dual elastic clamping according to claim 4, characterized in that: The outer diameter of the external thread (122) is d1, and the lead of the external thread (122) is P, which should satisfy: 0.3d1≤P≤0.8d1.

6. The modular cutting tool with dual elastic clamping according to any one of claims 1 to 5, characterized in that: The internal thread (222) has an internal transition surface (2223) at the beginning of the thread, which is located between the internal crest (2221) and the internal root (2222). The internal transition surface (2223) includes an internal variable diameter surface (22231) and an internal equal diameter surface (22232). The external thread (122) has an external transition surface (1223) at the beginning of the thread, which is located between the external crest (1221) and the external root (1222). The external transition surface (1223) includes an external variable diameter surface (12231) and an external equal diameter surface (12232). The internal crest (2221) at the intersection of the internal thread (222) and the internal transition surface (2223) has a complete width while the internal root (2222) has an incomplete width. The external crest (1221) at the intersection of the external thread (122) and the external transition surface (1223) has a complete width while the external root (1222) has an incomplete width.

7. The modular cutting tool with dual elastic clamping according to claim 6, characterized in that: The inner transition surface (2223) has an inner variable diameter surface (22231) and an inner equal diameter surface (22232) that are tangent concave cylindrical surfaces. The inner equal diameter surface (22232) and the internal thread (222) are concentric. The outer transition surface (12233) has an outer variable diameter surface (12231) and an outer equal diameter surface (12232) that are tangent convex and concave cylindrical surfaces, respectively. The outer equal diameter surface (12232) and the external thread (122) are concentric.

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