Modular cutting tool with double radial clamping

Abstract

The invention discloses a modular cutting tool with double radial clamping, which comprises a clamping component and a cutting component arranged on the clamping component, the clamping component comprises a clamping handle part and a clamping head part, the cutting component comprises a cutting head part and a cutting tail part, the cutting tail part is provided with a clamping bulge, and the clamping bulge is provided with a clamping groove. A clamping protrusion is arranged on the clamping end face of the clamping head, a clamping recess is formed in the clamping end face of the clamping head, the clamping protrusion comprises a cylindrical table and an external thread which are sequentially arranged, the clamping recess comprises a front end recess, an internal thread and a rear end recess which are sequentially arranged, and in the process that the cutting component is installed in the clamping component, the external thread and the internal thread are screwed in in a matched mode. And the outer crest and the cylindrical table of the outer thread are respectively contacted and matched with the rear end recess and the front end recess in sequence to form double radial clamping. The cutter has the advantages of being good in connection strength and rigidity, high in cutting efficiency, long in service life, stable in cutting and the like.

Description

Technical Field

[0001] The present invention mainly relates to the field of metal cutting, and particularly relates to a modular cutting tool with dual radial clamping. Background Art

[0002] During the machining process, only the cutting part of the cutting tool participates in cutting, and the clamping shank does not participate in cutting. In order to avoid the scrapping of the entire cutting tool due to damage to the cutting part and extend the service life of the cutting tool, in the prior art, the cutting part and the clamping shank of the cutting tool are usually independently provided, and the cutting part and the clamping shank are connected by means of ordinary threads and other connection methods 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-diameter ratio of cutting tools has been increasing continuously, so higher strength and rigidity requirements are put forward for the tools. In order to make the performance of the split modular cutting tool approach that of the integral tool, the tool can be made of cemented carbide or materials with properties similar to those of cemented carbide. At the same time, in order to enable the cutting component to be quickly disassembled and assembled on the clamping component, generally, thread fitting is used to connect the cutting component and the clamping component, and a cylindrical surface and an end surface are provided at the end of the clamping component to be in contact and cooperate with the cutting component respectively, so as to limit the center and end surface of the cutting component and ensure the axial and radial positioning accuracy and positioning strength of the cutting component. This connection method can realize the high-strength and quick loading and unloading of the cutting component and has a simple structure. However, the radial rigidity and strength of this type of cutting tool are poor. When performing cutting with a large radial load such as side milling, the cutting vibration generated by the tool head is large, which affects the machining accuracy and reduces the service life of the cutting tool. Summary of the Invention

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

[0005] To solve the above technical problem, the present invention adopts the following technical solutions:

[0006] A modular cutting tool with dual radial 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. A clamping protrusion is provided on the cutting tail. A clamping recess is formed on the clamping end surface of the clamping head. The clamping protrusion includes a cylindrical platform and an external thread arranged in sequence. The clamping recess includes a front recess, an internal thread and a rear recess arranged in sequence. During the process of the cutting component being inserted into the clamping component, the external thread and the internal thread are screwed in cooperatively, and the outer thread crest and the cylindrical platform of the external thread are respectively in contact and cooperate with the rear recess and the front recess to form dual radial clamping.

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

[0008] The cylindrical platform and the external thread are arranged in sequence in a direction away from the cutting head, and the rear-end recess, the internal thread, and the front-end recess are arranged in sequence in a direction away from the clamping handle portion.

[0009] The outer diameter of the external thread is d1, and the lead P of the external thread should satisfy: 0.3d1 ≤ P ≤ 0.8d1.

[0010] The diameter of the front-end recess is D, and the diameter of the cylindrical platform is d, and it should satisfy: -0.02 mm ≤ D - d ≤ 0 mm.

[0011] The rear-end recess is formed on the inner tooth crest of the internal thread section, and the diameter of the intersection circle of the rear-end recess and the inner tooth crest is D1, and it should satisfy: 0 ≤ d1 - D1 ≤ 0.01 mm.

[0012] Both the clamping protrusion and the clamping recess are axisymmetric about the rotation center axis of the modular cutting tool.

[0013] The cone angle of the rear-end recess is θ1, and it should satisfy: 0° ≤ θ1 ≤ 1°.

[0014] A stepped surface is provided between the cutting head and the cutting tail, and the clamping end surface is in abutting fit with the stepped surface.

[0015] An inner transition surface located between the inner tooth crest and the inner tooth root is provided at the starting point of the internal thread. The inner transition surface includes an inner diameter-changing surface and an inner equal-diameter surface. An outer transition surface located between the outer tooth crest and the outer tooth root is provided at the starting point of the external thread. The outer transition surface includes an outer diameter-changing surface and an outer equal-diameter surface. The inner tooth crest at the intersection of the internal thread and the inner transition surface has a complete width while the inner tooth root has an incomplete width. The outer tooth crest at the intersection of the external thread and the outer transition surface has a complete width while the outer tooth root has an incomplete width.

[0016] The inner diameter-changing surface and the inner equal-diameter surface of the inner transition surface are tangent concave cylindrical surfaces. The inner equal-diameter surface is concentric with the internal thread. The outer diameter-changing surface and the outer equal-diameter surface of the outer transition surface are respectively tangent convex and concave cylindrical surfaces. The outer equal-diameter surface is concentric with the external thread.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] (1) The modular cutting tool with double radial clamping of the present invention, when the cutting component is installed into the clamping component, the external thread and the internal thread are screwed in, and the external crest and the columnar platform of the external thread are contacted and matched with the rear end recess and the front end recess respectively to form a double radial clamping, so as to realize the over-positioning clamping of the cutting component to the cutting component. Not only is the structure simple, but also the positioning strength and accuracy of the cutting component are greatly improved. The rear end recess is at the bottom of the interface, and the overall strength is better. The external thread and the rear end recess cooperate to achieve a true interference fit. In addition, during the assembly process, foreign matter such as abrasive particles on the surface of the bottom of the rear end recess can be pushed into the tooth profile of the external thread by the external crest of the external thread, thereby ensuring the matching accuracy of the external thread and the rear end recess and avoiding abnormal damage at the interface.

[0019] (2) The modular cutting tool with double radial clamping of the present invention forms double radial interference clamping positioning by accurately defining the interference amount at the double radial clamping position, ensuring full contact between the conical surface and the cylindrical surface, greatly improving the clamping rigidity of the cutting component, and effectively reducing the deformation between the clamping component and the interface of the cutting component, thereby improving the maximum overhang length ratio and cutting life of the cutting component, especially the cutting depth can be increased by more than double. At the same time, the outer tooth top at the end of the cutting component forms a spiral intermittent interference clamping fit on the rear end recess of the clamping component, and the gap space can effectively reduce the influence of the grinding powder particles on the interference fit, ensuring the smoothness of the external thread interference twisting into the rear end recess. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural diagram of the modular cutting tool with double radial clamping of the present invention.

[0021] Figure 2 It is a front view of the modular cutting tool with double radial clamping of the present invention.

[0022] Figure 3 yes Figure 2 AA view in.

[0023] Figure 4 It is a three-dimensional structural diagram of the clamping component of the modular cutting tool with double radial clamping according to the present invention.

[0024] Figure 5 It is a three-dimensional structural diagram of the cutting component of the modular cutting tool with double radial clamping according to the present invention.

[0025] Figure 6 It is a front view of the cutting component of the modular cutting tool with double radial clamping according to the present invention.

[0026] The symbols in the figure represent:

[0027] 1. Clamping component; 11. Clamping handle; 12. Clamping head; 121. Clamping recess; 122. Internal thread; 1221. Inner thread crest; 1222. Inner thread root; 1223. Inner transition surface; 12231. Inner diameter-changing surface; 12232. Inner equal-diameter surface; 123. Front-end recess; 124. Rear-end recess; 13. Clamping end face; 2. Cutting component; 21. Cutting head; 22. Cutting tail; 221. Clamping protrusion; 222. External thread; 2221. Outer thread crest; 2222. Outer thread root; 2223. Outer transition surface; 22231. Outer diameter-changing surface; 22232. Outer equal-diameter surface; 2225. Outer end face; 223. Cylindrical platform; 23. Step surface; 24. Rotation central axis. Detailed implementation mode

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "horizontal", "inner", "outer", "top", "bottom", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0030] Figures 1 to 6An embodiment of the modular cutting tool with double radial clamping according to the present invention is shown. The modular cutting tool with double radial clamping 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 221 is provided on the cutting tail 22. A clamping recess 121 is formed on the clamping end face 13 of the clamping head 12. The clamping protrusion 221 includes a cylindrical platform 223 and an external thread 222 arranged in sequence. The clamping recess 121 includes a front-end recess 123, an internal thread 122, and a rear-end recess 124 arranged in sequence. During the process of loading the cutting component 2 into the clamping component 1, the external thread 222 is screwed into the internal thread 122. The external tooth crest 2221 of the external thread 222 and the cylindrical platform 223 are respectively in contact and cooperation with the rear-end recess 124 and the front-end recess 123 in sequence to form double radial clamping, realizing double radial over-position clamping of the cutting component, greatly improving the positioning strength and accuracy of the cutting component. The cooperation between the external thread 222 and the rear-end recess 124 and the cooperation between the cylindrical platform 223 and the front-end recess 123 are respectively located on both sides of the internal thread 122, and the radial positioning distribution is balanced, further improving the positioning strength and accuracy. The rear-end recess 124 is at the bottom of the interface, and the overall strength is better. The cooperation between the external thread 222 and the rear-end recess 124 can achieve a true interference fit. Moreover, during the assembly process, foreign matters such as surface abrasive grains at the bottom of the rear-end recess 124 can be pushed by the external tooth crest of the external thread 222 into the tooth profile of the external thread 222, thereby ensuring the fitting accuracy between the external thread 222 and the rear-end recess 124 and avoiding abnormal damage at the interface.

[0031] In this embodiment, the cylindrical platform 223 and the external thread 222 are arranged in sequence in the direction away from the cutting head 21, and the rear-end recess 124, the internal thread 122, and the front-end recess 123 are arranged in sequence in the direction away from the clamping shank 11.

[0032] In this embodiment, the outer diameter of the external thread 222 is d1, and the lead of the external thread 222 is P. In order to ensure that the clamping component 1 can complete the rapid loading and unloading on the cutting component 2, it should satisfy: 0.3d1 ≤ P ≤ 0.8d1.

[0033] In this embodiment, the diameter of the front-end recess 123 is D, and the diameter of the cylindrical platform 223 is d. In order to improve the radial clamping stability between the front-end recess 123 and the cylindrical platform 223 of the cutting component 1 and the clamping component 2, the interference amount between the front-end recess 123 and the cylindrical platform 223 can be accurately controlled according to the cutting working conditions of the cutting component 2 to fully improve the rigidity and cutting efficiency of the cutting component 2. It should satisfy: -0.02 mm ≤ D - d ≤ 0 mm. In this embodiment, D - d = 0.01 mm.

[0034] In this embodiment, the rear-end recess 124 is formed on the inner tooth crest 1221 of the internal thread section 122. The diameter of the intersection circle of the rear-end recess 124 and the inner tooth crest 1221 is D1. To ensure that the outer tooth crest 2221 of the external thread 222 at the lower end is in interference contact fit with the rear-end recess 124, it should satisfy: 0≤d1 - D1≤0.01 mm. In this embodiment, d1 - D1 = 0.005 mm.

[0035] In this embodiment, both the clamping protrusion 221 and the clamping recess 121 are symmetric about the rotation center axis 24 of the modular cutting tool.

[0036] In this embodiment, the taper angle of the rear-end recess 124 is θ1. To ensure that after the elastic deformation of the rear-end recess 124 can fully contact the outer tooth crest 2221 of the external thread 222, the clamping end face 13 of the clamping component 1 and the step face 23 of the cutting component 2 can also be fully and completely in contact, it should satisfy: 0°≤θ1≤1°. In this embodiment, θ1 = 0.8°.

[0037] In this embodiment, a step face 23 is provided between the cutting head 21 and the cutting tail 22. The clamping end face 13 abuts against the step face 23 in a mating manner. That is, the clamping component 1 is in corresponding contact with the external thread 222 and the step face 23 of the cutting component 2 through the rear-end recess 124 and the clamping end face 13 respectively, further improving the impact resistance and stability of the modular cutting tool.

[0038] In this embodiment, an inner transition surface 1223 located between the inner tooth crest 1221 and the inner tooth root 1222 is provided at the starting point of the internal thread 122. The inner transition surface 1223 includes an inner diameter-changing surface 12231 and an inner equal-diameter surface 12232. An outer transition surface 2223 located between the outer tooth crest 2221 and the outer tooth root 2222 is provided at the starting point of the external thread 222. The outer transition surface 2223 includes an outer diameter-changing surface 22231 and an outer equal-diameter surface 22232. At the intersection of the internal thread 122 and the inner transition surface 1223, the inner tooth crest 1221 has a complete width while the inner tooth root 1222 has an incomplete width. At the intersection of the external thread 222 and the outer transition surface 2223, the outer tooth crest 2221 has a complete width while the outer tooth root 2222 has an incomplete width. During the loading and unloading process of the clamping component 1 and the cutting component 2, it can ensure good connection strength between the internal thread 122 and the external thread 222 made of cemented carbide materials, and can effectively avoid chipping of the inner tooth root 1222 of the internal thread and the outer tooth crest 2221 of the external thread, improving the interface reliability.

[0039] In this embodiment, in order to strictly control the external dimensions of the inner transition surface 1223 and the outer transition surface 2223 on the clamping component 1 and the cutting component 2 and reduce the manufacturing difficulty, the inner diameter-changing surface 12231 and the inner equal-diameter surface 12232 of the inner transition surface 1223 are tangent concave cylindrical surfaces, the inner equal-diameter surface 12232 is concentric with the inner thread 122, the outer diameter-changing surface 22231 and the outer equal-diameter surface 22232 of the outer transition surface 2223 are respectively tangent convex and concave cylindrical surfaces, and the outer equal-diameter surface 22232 is concentric with the outer thread 222.

[0040] In the above embodiment, the module interface between the cutting tool clamping component 1 and the cutting component 2 adopts a double-headed large lead angle thread structure with a large pitch, which is quick and convenient for disassembly and assembly, and improves the connection strength between the clamping component 1 and the cutting component 2. However, the present invention is not limited to this. According to the different interface precision and dimensional specifications requirements 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 into single-headed, three-headed and other head number structures.

[0041] In the above embodiment, the thread profiles of the inner thread on the clamping component 1 and the outer thread on the cutting component 2 are straight lines, and the thread angles on both sides are equal. However, the present invention is not limited to this. According to different process requirements and actual working conditions, the thread profile can also be designed into an arc shape, etc., and at the same time, the thread profiles on both sides can also be designed into different shapes.

[0042] In the above embodiment, the modular cutting tool with double radial clamping is applied to a rotary tool. However, the present invention is not limited to this. The application of this interface technology to non-rotary tool structures such as turning is within the scope of the present invention.

[0043] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention shall fall within the scope of the protection of the technical solution of the present invention.

Claims

1. A modular cutting tool with double radial clamping, comprising 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), the cutting tail (22) is provided with a clamping protrusion (221), and a clamping recess (121) is formed on the clamping end face (13) of the clamping head (12), and is characterized in that: The clamping protrusion (221) includes a cylindrical platform (223) and an external thread (222) which are arranged in sequence, and the clamping recess (121) includes a front end recess (123), an internal thread (122) and a rear end recess (124) which are arranged in sequence. When the cutting component (2) is installed into the clamping component (1), the external thread (222) is screwed into the internal thread (122), and the external crest (2221) and the cylindrical platform (223) of the external thread (222) are respectively contacted and matched with the rear end recess (124) and the front end recess (123) to form a double radial clamping.

2. The modular cutting tool with double radial clamping according to claim 1, characterized in that: The cylindrical platform (223) and the external thread (222) are arranged in sequence in a direction away from the cutting head (21), and the rear end recess (124), the internal thread (122) and the front end recess (123) are arranged in sequence in a direction away from the clamping handle (11).

3. The modular cutting tool with double radial clamping according to claim 1, characterized in that: The outer diameter of the external thread (222) is d1, and the lead P of the external thread (222) should satisfy: 0.3d1≤P≤0.8d1.

4. The modular cutting tool with dual radial clamping according to claim 3, characterized in that: The diameter of the front end recess (123) is D, and the diameter of the columnar platform (223) is d, which should satisfy: -0.02mm≤Dd≤0mm.

5. The modular cutting tool with double radial clamping according to claim 3, characterized in that: The rear end recess (124) is provided on the inner crest (1221) of the inner thread (122), and the diameter of the intersection circle of the rear end recess (124) and the inner crest (1221) is D1, which should satisfy: 0≤d1-D1≤0.01mm.

6. The modular cutting tool with double radial clamping according to any one of claims 1 to 5, characterized in that: The clamping protrusion (221) and the clamping recess (121) are both symmetrical about the rotation center axis (24) of the modular cutting tool.

7. The modular cutting tool with double radial clamping according to claim 6, characterized in that: The cone angle of the rear end recess (124) is θ1, which should satisfy: 0°≤θ1≤1°.

8. The modular cutting tool with double radial clamping according to any one of claims 1 to 5, characterized in that: A step surface (23) is provided between the cutting head portion (21) and the cutting tail portion (22), and the clamping end surface (13) is in abutment with the step surface (23).

9. The modular cutting tool with double radial clamping according to any one of claims 1 to 5, characterized in that: The starting point of the internal thread (122) is provided with an inner transition surface (1223) located between the inner tooth top (1221) and the inner tooth bottom (1222), and the inner transition surface (1223) includes an inner diameter reducing surface (12231) and an inner equal diameter surface (12232); the starting point of the external thread (222) is provided with an outer transition surface (2223) located between the outer tooth top (2221) and the outer tooth bottom (2222), and the outer transition surface (2223) includes an inner diameter reducing surface (12231) and an inner equal diameter surface (12232). 223) includes an outer diameter-changing surface (22231) and an outer equal-diameter surface (22232), the inner crest (1221) at the intersection of the inner thread (122) and the inner transition surface (1223) has a complete width while the inner root (1222) has an incomplete width, and the outer crest (2221) at the intersection of the outer thread (222) and the outer transition surface (2223) has a complete width while the outer root (2222) has an incomplete width.

10. The modular cutting tool with double radial clamping according to claim 9, characterized in that: The inner diameter-changing surface (12231) and the inner equal-diameter surface (12232) of the inner transition surface (1223) are tangent concave cylindrical surfaces. The inner equal-diameter surface (12232) is concentric with the internal thread (122). The outer diameter-changing surface (22231) and the outer equal-diameter surface (22232) of the outer transition surface (2223) are respectively a tangent convex cylindrical surface and a tangent concave cylindrical surface. The outer equal-diameter surface (22232) is concentric with the external thread (222).

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