Small-conical-surface sawtooth-shaped threaded connection structure of industrial cutter

Abstract

The utility model discloses a small-conical-surface sawtooth-shaped threaded connection structure of an industrial cutter, and relates to the field of cutter mounting structures, the small-conical-surface sawtooth-shaped threaded connection structure comprises a handle part and a cutter head, a threaded mounting hole is formed in the end, close to the cutter head, of the handle part, the threaded mounting hole comprises a threaded hole and a conical hole, and the conical hole is coaxially formed in the end, close to the cutter head, of the threaded hole; a threaded connecting part is arranged at the end, close to the handle part, of the tool bit and comprises a screw and a conical positioning table, the screw is in threaded fit with the threaded hole, and the side face of the conical positioning table is attached to the hole wall of the conical hole after the handle part and the tool bit are installed and fixed; the end, close to the tool bit, of the handle part is arranged to be an abutting face perpendicular to the axis of the threaded installation hole, the end face, close to the threaded connection part, of the tool bit is arranged to be an abutting face perpendicular to the axis of the threaded connection part, and the two abutting faces are attached after the handle part and the tool bit are installed and fixed. And threads on the threaded hole and the screw rod are saw-tooth-shaped threads. The device has the effects of being high in repeated positioning precision and convenient to disassemble.

Description

Technical Field

[0001] The present application relates to the field of tool installation structures, and in particular to a small conical serrated thread connection structure of an industrial tool. Background Art

[0002] In industrial production, a variety of cutting tools are needed to process workpieces. The cutter head will wear during use. As the use time increases, the wear will become more and more serious. When the degree of tool wear causes the processing efficiency and precision to fail to meet the processing requirements, new tools will be replaced to ensure processing efficiency and precision.

[0003] In the related art, the tool generally includes a shank and a cutter head. The shank and the cutter head are coaxially fixed together. The cutter head is provided with a blade for cutting the workpiece, and the shank is used to be clamped and fixed to the machine head of the machine tool. The most common tool shank and cutter head are integrated. When replacing the tool, the shank and the cutter head need to be replaced at the same time. Each time the tool is replaced, the position of the new tool needs to be recalibrated. In order to reduce unnecessary waste of the shank part and to facilitate tool replacement, a tool with a detachable and fixed shank and cutter head is provided in the prior art. After the cutter head is worn, the shank and the cutter head are separated, and only the cutter head is disassembled for repair or replacement. The shank and the cutter head are generally connected by a threaded structure, which is convenient for assembly and disassembly. For example, the invention application with publication number CN117483854A, a kind of impeller blade finishing tool and processing method, mechanical engineering (instruction manual

[0032] , specification drawings Figure 1 ).

[0004] With regard to the above-mentioned related technologies, when the applicant uses a tool in which the tool head and the tool handle are detachably connected by a threaded structure for processing, when performing high-precision processing, the processing accuracy will be reduced after a prop is replaced. After analysis by technical personnel, it was found that the matching accuracy of the conventionally designed threaded connection structure is not high. After the tool head is replaced, the coaxiality and position accuracy of the new tool head and the tool handle are difficult to meet the precision requirements. For this reason, the inventor redesigned the threaded connection structure of the tool to ensure the processing accuracy after the tool is replaced and reduce the calibration of the tool head position. Utility Model Content

[0005] In order to improve the positioning accuracy of a tool thread connection structure, the present application provides a small conical serrated thread connection structure of an industrial tool, which has a high repeated positioning accuracy.

[0006] The small conical serrated thread connection structure of an industrial tool provided in the present application adopts the following technical solution:

[0007] A small conical serrated threaded connection structure for an industrial tool, comprising a shank and a cutter head, wherein a threaded mounting hole is provided at one end of the shank close to the cutter head, wherein the threaded mounting hole comprises a threaded hole and a tapered hole, wherein the tapered hole is coaxially arranged at one end of the threaded hole close to the cutter head; a threaded connection portion is provided at one end of the cutter head close to the shank, wherein the threaded connection portion comprises a screw and a tapered positioning platform, wherein the screw is threadably matched with the threaded hole, and the side surface of the tapered positioning platform is in contact with the wall of the tapered hole after the shank and the cutter head are installed and fixed; the end of the shank close to the cutter head is arranged as an abutment surface perpendicular to the axis of the threaded mounting hole, and the end surface of the cutter head close to the threaded connection portion is arranged as an abutment surface perpendicular to the axis of the threaded connection portion, and the two abutment surfaces are in contact after the shank and the cutter head are installed and fixed.

[0008] By adopting the above technical solution, the serrated thread, conical surface positioning and end face fitting are combined. When the threaded connection part on the cutter body is screwed into the threaded mounting hole of the tool handle and the cutter head is locked with a wrench, the conical surface of the conical positioning table contacts the conical surface of the conical hole as the final fitting and guiding position; after the handle and the cutter head are installed and fixed, the two abutting surfaces fit together and the axial position of the cutter head is positioned; the serrated thread is locked, and the serrated thread design can achieve self-locking.

[0009] Optionally, the size of the threaded mounting hole is such that the forward rake angle a1 of the sawtooth is 30-30.5 degrees, and the backward rake angle b1 of the sawtooth is 10-10.5 degrees; the size of the threaded connection part is such that the forward rake angle a2 of the sawtooth is 29.5-30 degrees, and the backward rake angle b2 of the sawtooth is 9.5-10 degrees.

[0010] By adopting the above technical solution, the angular dimensions of the threaded connection structure are designed to ensure the coaxiality and screwing stability of the serrated threaded connection structure.

[0011] Optionally, the taper d1 of the tapered positioning stage is 5 degrees, and the tolerance satisfies AT3 or AT2; the taper d2 of the tapered hole is 5 degrees, and the tolerance satisfies -AT3 or -AT2.

[0012] By adopting the above technical solution, the taper of the conical positioning platform and the conical hole is designed to optimize the guiding and positioning effects of the conical positioning platform and the conical hole.

[0013] Optionally, the surface roughness of the side wall of the conical positioning platform and the wall of the conical hole is Rz2.5; the surface roughness of the abutting surface of the tool handle and the tool head is Rz2.5; and the surface roughness of the screw and the wall of the threaded hole is Rz25.

[0014] By adopting the above technical solution, the surface roughness of the screw and the wall of the threaded hole is designed to be Rz25 to ensure self-locking performance; the surface roughness of the side wall of the tapered positioning table, the wall of the tapered hole, and the abutment surface of the tool handle and the tool head are all designed to be Rz2.5, which improves the positioning accuracy, reduces the wear of the positioning structure during repeated disassembly and assembly of the tool head, and helps to improve the repeat positioning accuracy.

[0015] Optionally, a V-shaped transition ring groove is arranged between the threaded connection part and the end face of the cutter head, and the V-shaped bottom is arranged as a tangent arc angle; the V-shaped opening angle of the V-shaped transition ring groove is 35 degrees, and the angle between the side wall of the V-shaped transition ring groove close to the threaded connection part and the axis of the threaded connection part is 30 degrees.

[0016] Optionally, the threaded mounting hole further includes a transition ring groove, wherein the transition ring groove is arranged between the threaded hole and the tapered hole, and a diameter of the transition ring groove is larger than a maximum diameter of the threaded hole.

[0017] Optionally, the handle includes a connecting seat and a tool-mounting rod, the tool-mounting rod is fixed on the connecting seat, and a section of the tool-mounting rod away from the connecting seat is coaxially provided with the threaded mounting hole; the tool-mounting rod is a cantilevered rod body made of a cemented carbide material.

[0018] By adopting the above technical solution, the handle is designed into two parts, which are processed and manufactured separately, which can reduce the processing difficulty; the tool rod is made of carbide material to ensure sufficient structural strength and can better meet the needs of repeated use; only the tool rod is made of carbide to reduce the manufacturing cost.

[0019] Optionally, a through hole is coaxially formed on the connecting seat and the tool mounting rod, a radial hole is formed on the circumferential side of the tool head toward the axial center, and a connecting hole connecting the through hole and the radial hole is formed in the tool head and the threaded connection portion.

[0020] By adopting the above technical solution, through holes, connecting holes and radial holes are designed to form cutting fluid pipelines in the tool.

[0021] Optionally, a wrench socket for convenient wrench engagement is provided on the side wall of the cutter head.

[0022] By adopting the above technical solution, it is convenient to use a wrench tool to directly disassemble and replace the cutter head.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The present application discloses a small conical serrated thread connection structure for an industrial tool. By combining serrated threads, conical surface positioning, and end face fitting, when the threaded connection portion on the tool body is screwed into the threaded mounting hole of the tool handle, the tool head is locked with a wrench, and the conical surface of the conical positioning platform contacts the conical surface of the conical hole as the final fitting and guiding position. After the handle and the tool head are installed and fixed, the two abutting surfaces fit together, the axial position of the tool head is positioned, the serrated threads are locked, and the serrated thread design can achieve self-locking.

[0025] 2. The positioning accuracy and repeatability of the threaded connection structure are improved by redesigning the relevant dimensions of the threaded connection part and the threaded connection hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0027] Figure 2 yes Figure 1 AA section view;

[0028] Figure 3 It is a schematic diagram of the structure of the cutter head;

[0029] Figure 4 yes Figure 3 Magnified view of area B;

[0030] Figure 5 yes Figure 3 Magnified view of area C in the middle;

[0031] Figure 6 It is a schematic diagram of the structure of the tool bar;

[0032] Figure 7 yes Figure 6 Magnified view of area D in center.

[0033] Figure numerals: 1. handle; 11. through hole; 2. cutter head; 21. threaded connection; 22. screw; 23. conical positioning platform; 24. V-shaped transition ring groove; 25. wrench bayonet; 26. connecting hole; 27. radial hole; 3. connecting seat; 4. tool rod; 41. threaded mounting hole; 42. threaded hole; 43. conical hole; 44. transition ring groove. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-7 This application is described in further detail.

[0035] The present application embodiment discloses a small conical sawtooth thread connection structure for an industrial tool, referring to Figure 1 and Figure 2 , comprising a handle 1 and a cutter head 2.

[0036] The handle 1 includes a connecting seat 3 and a tool rod 4. The connecting seat 3 is a connector with a machine tool head connecting structure. The tool rod 4 is a cantilevered rod made of carbide material. The tool rod 4 is plugged and fixed on the connecting seat 3. A threaded mounting hole 41 is coaxially provided at one end of the tool rod 4 away from the connecting seat 3. A threaded connecting portion 21 is coaxially provided at one end of the tool head 2 close to the handle 1 corresponding to the threaded mounting hole 41.

[0037] A wrench slot 25 for convenient wrench engagement is provided on the peripheral side wall of the cutter head 2 .

[0038] A through hole 11 is coaxially penetrated through the connecting seat 3 and the tool mounting rod 4, a radial hole 27 is provided at the lateral axial position of the cutter head 2, and a connecting hole 26 connecting the through hole 11 and the radial hole 27 is provided in the cutter head 2 and the threaded connecting part 21. The through hole 11, the connecting hole 26 and the radial hole 27 form a cutting fluid pipeline arranged inside the tool for flushing the cutting fluid into the cutting part.

[0039] The threaded mounting hole 41 includes a threaded hole 42, a transition annular groove 44 and a tapered hole 43. The tapered hole 43 is coaxially arranged at one end of the threaded hole 42 close to the cutter head 2, and the transition annular groove 44 is coaxially arranged between the threaded hole 42 and the tapered hole 43; the diameter of the transition annular groove 44 is larger than the maximum diameter of the threaded hole 42.

[0040] The threaded connection part 21 includes a screw rod 22 and a conical positioning platform 23, and the screw rod 22 and the conical positioning platform 23 are coaxially arranged with the cutter head 2. The screw rod 22 is threadedly matched with the threaded hole 42, and the threads on the threaded hole 42 and the screw rod 22 are both sawtooth threads; the conical positioning platform 23 is adapted to the size of the conical hole 43, and the side of the conical positioning platform 23 fits with the wall of the conical hole 43 after the cutter head 2 is installed and fixed on the tool rod 4. The end of the tool rod 4 close to the cutter head 2 is set as an abutment surface perpendicular to the axis of the threaded mounting hole 41, and the end face of the cutter head 2 close to the threaded connection part 21 is set as an abutment surface perpendicular to the axis of the threaded connection part 21. After the tool rod 4 and the cutter head 2 are installed and fixed, the two abutment surfaces of the two fit.

[0041] The surface roughness of the side wall of the tapered positioning platform 23 and the wall of the tapered hole 43 are both Rz2.5; the surface roughness of the abutting surfaces of the tool handle and the tool head 2 are both Rz2.5; the surface roughness of the screw 22 and the wall of the threaded hole 42 are both Rz25.

[0042] refer to Figure 3 and Figure 4 A V-shaped transition annular groove 24 is provided between the threaded connection portion 21 and the end surface of the cutter head 2, and the V-shaped opening angle of the V-shaped transition annular groove 24 is 35 degrees; the V-shaped bottom is set to an arc angle, and the arc angle is a tangent arc angle; the angle between the side wall of the V-shaped transition annular groove 24 close to the conical positioning portion and the axis of the conical positioning portion is 30 degrees ( Figure 4 The vertical line parallel to the axis of the tapered positioning part is used as the reference line).

[0043] refer to Figure 3 and Figure 5 The dimensions of the screw 22 are as follows: the forward inclination angle a1 of the sawtooth is 30 degrees, the upper tolerance of a1 is 0 degrees, and the lower tolerance of a1 is -0.5 degrees; the backward inclination angle b1 of the sawtooth is 10 degrees, the upper tolerance of b1 is 0 degrees, and the lower tolerance of b1 is -0.5 degrees.

[0044] refer to Figure 3 The taper d1 of the tapered positioning platform 23 is 5 degrees, and the tolerance satisfies AT3 or AT2; the taper d2 of the tapered hole 43 is 5 degrees, and the tolerance satisfies -AT3 or -AT2.

[0045] refer to Figure 6 and Figure 7 The dimensions of the threaded hole 42 are as follows: the forward rake angle a2 of the sawtooth is 30 degrees, the upper tolerance of a2 is 0.5 degrees, and the lower tolerance of a2 is 0 degrees; the backward rake angle b2 of the sawtooth is 10 degrees, the upper tolerance of b2 is 0.5 degrees, and the lower tolerance of b2 is 0 degrees.

[0046] The implementation principle of the small conical serrated thread connection structure of an industrial tool disclosed in an embodiment of the present application is: by combining the serrated thread, conical surface positioning, and end face fitting, when the threaded connection part 21 on the tool body is screwed into the threaded mounting hole 41 of the tool handle, the tool head 2 is locked with a wrench, and the conical surface of the conical positioning platform 23 contacts the conical surface of the conical hole 43 as the final fitting and guiding position. After the handle 1 and the tool head 2 are installed and fixed, the two abutting surfaces fit together, the axial position of the tool head 2 is positioned, the serrated thread is locked, and the serrated thread design can achieve self-locking.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A small conical sawtooth thread connection structure for an industrial tool, comprising a shank (1) and a tool head (2), characterized in that: A threaded mounting hole (41) is provided at one end of the shank (1) close to the cutter head (2), wherein the threaded mounting hole (41) comprises a threaded hole (42) and a tapered hole (43), wherein the tapered hole (43) is coaxially arranged at one end of the threaded hole (42) close to the cutter head (2); a threaded connecting portion (21) is provided at one end of the cutter head (2) close to the shank (1), wherein the threaded connecting portion (21) comprises a screw rod (22) and a tapered positioning platform (23), wherein the screw rod (22) is threadably matched with the threaded hole (42), and the shank (1) After being mounted and fixed with the cutter head (2), the side surface of the conical positioning platform (23) is in contact with the wall of the conical hole (43); the end of the shank (1) close to the cutter head (2) is arranged as an abutment surface perpendicular to the axis of the threaded mounting hole (41), and the end surface of the cutter head (2) close to the threaded connection part (21) is arranged as an abutment surface perpendicular to the axis of the threaded connection part (21); the two abutment surfaces are in contact with each other after the shank (1) and the cutter head (2) are mounted and fixed; the threads on the threaded hole (42) and the screw rod (22) are both sawtooth threads.

2. The small conical sawtooth thread connection structure of an industrial tool according to claim 1, characterized in that: The dimensions of the threaded mounting hole (41) are such that the sawtooth has a forward rake angle a1 of 30-30.5 degrees and a sawtooth has a backward rake angle b1 of 10-10.5 degrees; the dimensions of the threaded connection portion (21) are such that the sawtooth has a forward rake angle a2 of 29.5-30 degrees and a sawtooth has a backward rake angle b2 of 9.5-10 degrees.

3. The small conical sawtooth thread connection structure of an industrial tool according to claim 2, characterized in that: The taper d1 of the tapered positioning platform (23) is 5 degrees, and the tolerance satisfies AT3 or AT2; the taper d2 of the tapered hole (43) is 5 degrees, and the tolerance satisfies -AT3 or -AT2.

4. The small conical sawtooth thread connection structure of an industrial tool according to claim 3, characterized in that: The surface roughness of the side wall of the conical positioning platform (23) and the wall of the conical hole (43) are both Rz2.5; the surface roughness of the abutting surface of the shank and the cutter head (2) are both Rz2.5; and the surface roughness of the screw rod (22) and the wall of the threaded hole (42) are both Rz25.

5. The small conical sawtooth thread connection structure of an industrial tool according to claim 1, characterized in that: A V-shaped transition annular groove (24) is provided between the threaded connection portion (21) and the end surface of the cutter head (2), and the V-shaped bottom is provided at a tangent arc angle; the V-shaped opening angle of the V-shaped transition annular groove (24) is 35 degrees, and the angle between the side wall of the V-shaped transition annular groove (24) close to the threaded connection portion (21) and the axis of the threaded connection portion (21) is 30 degrees.

6. The small conical sawtooth thread connection structure of an industrial tool according to claim 1, characterized in that: The threaded mounting hole (41) further comprises a transition annular groove (44), wherein the transition annular groove (44) is arranged between the threaded hole (42) and the tapered hole (43), and the diameter of the transition annular groove (44) is greater than the maximum diameter of the threaded hole (42).

7. The small conical sawtooth thread connection structure of an industrial tool according to claim 1, characterized in that: The handle (1) comprises a connecting seat (3) and a tool-mounting rod (4); the tool-mounting rod (4) is fixed on the connecting seat (3); a section of the tool-mounting rod (4) away from the connecting seat (3) is coaxially provided with the threaded mounting hole (41); the tool-mounting rod (4) is a cantilevered rod body made of a hard alloy material.

8. The small conical sawtooth thread connection structure of an industrial tool according to claim 7, characterized in that: A through hole (11) is coaxially formed on the connection seat (3) and the tool mounting rod (4), a radial hole (27) is formed on the circumferential side of the tool head (2) toward the axis, and a connecting hole (26) is formed in the tool head (2) and the threaded connection portion (21) to communicate with the through hole (11) and the radial hole (27).

9. The small conical sawtooth thread connection structure of an industrial tool according to claim 1, characterized in that: A wrench slot (25) for convenient wrench engagement is provided on the side wall of the cutter head (2).

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