Shaft workpiece machining end face driving clamp

Abstract

The utility model relates to the technical field of machining, in particular to a shaft workpiece machining end face driving clamp. The end face of the shaft piece is centered and positioned through the positioning tip, the mandrel drives the driving pin to move towards the end face of the shaft piece and abut against the end face of the shaft piece, secondary positioning is carried out on the end face of the shaft piece, and outer circle machining can be carried out by being matched with a tailstock tip on machining equipment to abut against the end face of the shaft piece. All outer circular surfaces can be machined, and the clamping surfaces cannot be machined when a traditional three-jaw clamp is used; the runout of the machined outer circle is better guaranteed through centering of the positioning tip, and the precision is higher; the device can also adapt to the front end of a telescopic chuck or be directly installed on a lathe spindle, and all outer circle faces are machined.

Description

Technical Field

[0001] The utility model relates to the technical field of machining, and particularly relates to a drive fixture for machining end faces of shaft workpieces. Background Art

[0002] When the original shaft parts are CNC turned, in order to reduce a process of turning the boss, center holes are drilled at both ends of the blank, and the center holes are used as the positioning reference. However, due to the difference in the size of the center holes at both ends of the shaft, it is difficult to ensure the accurate positioning of the shaft in the axial direction. If the traditional three-point clamping fixture is used to clamp the shaft workpiece, only the end of the shaft workpiece can be clamped. The contact surface of the workpiece is small, the clamping force of the workpiece is not strong enough, and the positioning accuracy is not high. After repeated use, the accuracy of the fixture will be affected to a certain extent, resulting in low accuracy in repeated clamping and more unstable cutting. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a driving fixture for machining end faces of shaft workpieces which can process all outer cylindrical surfaces of shaft parts and ensure the runout of the outer cylindrical surface after processing and has higher precision.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model to solve its technical problems is:

[0005] A drive fixture for machining an end face of a shaft workpiece, comprising:

[0006] A mounting seat, on which a guide hole is provided;

[0007] A positioning seat is arranged on the mounting seat, a fixing hole is arranged on the positioning seat, a positioning top is arranged on the fixing hole, and the positioning top is used to center and position the end face of the shaft;

[0008] A driving pin is arranged on the positioning seat, a plurality of driving holes are evenly arranged on the positioning seat, the driving pin is slidably arranged on the driving hole, and the driving pin is used for secondary positioning of the end face of the shaft member;

[0009] A core shaft is inserted into the guide hole, the core shaft is drivingly connected to the driving pin, and the core shaft is used to drive the driving pin to move toward the end face of the shaft member and press against the end face of the shaft member.

[0010] In one embodiment of the utility model, a mounting tube is provided on the mounting seat, a fixing hole is provided on the positioning seat, the positioning seat is sleeved on the mounting tube, and the positioning seat is fixedly connected to the mounting seat by bolts.

[0011] In one embodiment of the utility model, a sliding groove is provided on the driving end of the driving pin, the shape of the sliding groove matches the inner wall of the mounting tube, and the side wall of the sliding groove is arranged opposite to the edge of the mounting tube.

[0012] In one embodiment of the utility model, an avoidance groove is provided on the free end of the driving pin, the shape of the avoidance groove matches the edge of the positioning top, the side wall of the avoidance groove is arranged opposite to the positioning top, and the length of the sliding groove is greater than the length of the avoidance groove.

[0013] In one embodiment of the utility model, the positioning tip includes a positioning rod, a positioning cone head is provided on the positioning rod, the positioning rod is slidably arranged on the fixing hole, and the positioning rod is sealed and connected to the fixing hole.

[0014] In one embodiment of the utility model, a limiting hole is provided on the positioning seat, a limiting bolt is provided on the limiting hole, a limiting rod is provided on the limiting bolt, a limiting slot is provided on the positioning rod, and the limiting rod is passed through the limiting slot.

[0015] In one embodiment of the utility model, the core shaft includes a pull rod, which is slidably arranged on the guide hole. A piston rod is provided at the free end of the pull rod, and the piston rod is slidably arranged on the mounting cylinder. The inner diameter of the mounting cylinder is larger than the inner diameter of the guide hole, the outer diameter of the piston rod is larger than the outer diameter of the pull rod, and a push block is provided on the piston rod, and the push block is connected to the driving pin.

[0016] In one embodiment of the utility model, the push block is provided with an arcuate surface, the piston rod is provided with a spherical groove, the arcuate surface is provided with a guide rod, the guide rod is passed through the piston rod, the arcuate surface of the push block is provided on the spherical groove, the push block is provided with a reference surface, and the reference surface abuts against the driving pin.

[0017] In one embodiment of the present invention, the length of the avoidance groove is smaller than the length of the limiting groove.

[0018] In one embodiment of the utility model, a mounting block is provided on the free end of the driving pin, and a positioning tooth surface is provided on the mounting block, and the cross section of the positioning tooth surface is triangular or trapezoidal.

[0019] Beneficial effects of the utility model:

[0020] The positioning center of the utility model centers and positions the end face of the shaft, and the core shaft drives the driving pin to move toward the end face of the shaft and presses against the end face of the shaft, thereby performing secondary positioning on the end face of the shaft. With the support of the tailstock center on the processing equipment, external cylindrical processing can be performed. Compared with the traditional three-jaw chuck clamping, all external cylindrical surfaces can be processed, while the clamping surface cannot be processed in the traditional three-jaw clamping. The centering with the positioning center better guarantees the runout of the external circle after processing, and has higher precision. The utility model can also be adapted to the front end of the telescopic chuck or directly installed on the lathe spindle to realize the processing of all external cylindrical surfaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The utility model is a schematic diagram of a drive fixture for machining end faces of shaft workpieces.

[0022] Figure 2 It is a cross-sectional view of the utility model.

[0023] Explanation of the numbers in the figure: 1. Mounting seat; 11. Guide hole; 12. Mounting cylinder; 2. Mandrel; 21. Piston rod; 22. Push block; 23. Guide rod; 24. Spherical groove; 25. Arc surface; 3. Positioning seat; 31. Reference surface; 4. Driving pin; 41. Sliding groove; 42. Avoidance groove; 43. Mounting block; 44. Positioning tooth surface; 5. Shaft; 6. Positioning rod; 61. Positioning cone head; 62. Limit bolt; 63. Limit rod; 64. Limit groove. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0025] Reference Figure 1-2 As shown, a drive fixture for machining end faces of shaft workpieces comprises:

[0026] A mounting seat 1, on which a guide hole 11 is provided;

[0027] A positioning seat 3 is arranged on the mounting seat 1, and a fixing hole is arranged on the positioning seat 3, and a positioning top is arranged on the fixing hole, and the positioning top is used to center and position the end face of the shaft member 5;

[0028] A driving pin 4 is arranged on the positioning seat 3. A plurality of driving holes are evenly arranged on the positioning seat 3. The driving pin 4 is slidably arranged on the driving hole. The driving pin 4 is used for performing secondary positioning on the end face of the shaft member 5.

[0029] The core shaft 2 is inserted into the guide hole 11 , and the core shaft 2 is drivingly connected to the driving pin 4 . The core shaft 2 is used to drive the driving pin 4 to move toward the end surface of the shaft member 5 and press against the end surface of the shaft member 5 .

[0030] The positioning center of the utility model centers and positions the end face of the shaft member 5, and the core shaft 2 drives the driving pin 4 to move toward the end face of the shaft member 5 and presses against the end face of the shaft member 5, so as to perform secondary positioning on the end face of the shaft member 5. With the support of the tailstock center on the processing equipment, external cylindrical processing can be performed. Compared with the traditional three-jaw chuck clamping, all external cylindrical surfaces can be processed, and the clamping surface cannot be processed in the traditional three-jaw clamping. The centering with the positioning center better guarantees the runout of the external circle after processing, and the precision is higher. It can also be adapted to the front end of the telescopic chuck or directly installed on the lathe spindle to realize the processing of all external cylindrical surfaces.

[0031] In one embodiment of the utility model, the mounting seat 1 is provided with a mounting tube 12, the positioning seat 3 is provided with a fixing hole, the positioning seat 3 is sleeved on the mounting tube 12, and the positioning seat 3 is fixedly connected to the mounting seat 1 by bolts.

[0032] Specifically, the positioning seat 3 is fixedly connected to the mounting seat 1 by bolts, so that the two can be quickly assembled to ensure the rapid assembly of the clamp and improve the positioning efficiency of the end face of the shaft member 5.

[0033] In one embodiment of the utility model, a sliding groove 41 is provided on the driving end of the driving pin 4 , the shape of the sliding groove 41 matches the inner wall of the mounting tube 12 , and the side wall of the sliding groove 41 is arranged opposite to the edge of the mounting tube 12 .

[0034] In one embodiment of the utility model, an avoidance groove 42 is provided on the free end of the driving pin 4, and the shape of the avoidance groove 42 matches the edge of the positioning top, and the side wall of the avoidance groove 42 is arranged opposite to the positioning top. The length of the sliding groove 41 is greater than the length of the avoidance groove 42, so that the driving pin 4 can push the positioning top to move a certain distance toward the end face of the shaft member 5, and support the shaft member 5 before clamping. After the shaft member 5 is tightened, the positioning top will be pushed back to the positioning seat 3, ensuring that the positioning top can pre-center the end face of the shaft member 5 and ensure the accuracy of subsequent centering.

[0035] In an embodiment of the present utility model, the positioning tip comprises a positioning rod 6, a positioning cone head 61 is provided on the positioning rod 6, the positioning rod 6 is slidably disposed on the fixing hole, and the positioning rod 6 is sealed and connected to the fixing hole.

[0036] In one embodiment of the utility model, a limiting hole is provided on the positioning seat 3, a limiting bolt 62 is provided on the limiting hole, a limiting rod 63 is provided on the limiting bolt 62, a limiting groove 64 is provided on the positioning rod 6, and the limiting rod 63 is passed through the limiting groove 64.

[0037] Specifically, when the positioning rod 6 slides on the fixing hole, the driving pin 4 can push the positioning tip to move a certain distance toward the end face of the shaft 5. The two side surfaces of the limit groove 64 can abut against the limit rod 63 to limit the moving stroke of the positioning rod 6. The limit adjustment operation is simple and fast.

[0038] In one embodiment of the utility model, the core shaft 2 includes a pull rod, which is slidably disposed on the guide hole 11. A piston rod 21 is provided at the free end of the pull rod. The piston rod 21 is slidably disposed on the mounting cylinder 12. The inner diameter of the mounting cylinder 12 is larger than the inner diameter of the guide hole 11. The outer diameter of the piston rod 21 is larger than the outer diameter of the pull rod. A push block 22 is provided on the piston rod 21, and the push block 22 is connected to the driving pin 4.

[0039] Specifically, the outer diameter of the piston rod 21 is larger than the outer diameter of the pull rod. A push block 22 is provided on the piston rod 21. The push block 22 is connected to the driving pin 4, which can limit the axial movement direction of the core shaft 2 to avoid the deviation of the piston rod 21, thereby improving the operation stability of the entire core shaft 2.

[0040] In one embodiment of the utility model, an arcuate surface 25 is provided on the push block 22, a spherical groove 24 is provided on the piston rod 21, a guide rod 23 is provided on the arcuate surface 25, the guide rod 23 is passed through the piston rod 21, the arcuate surface 25 of the push block 22 is provided on the spherical groove 24, a reference surface 31 is provided on the push block 22, and the reference surface 31 abuts against the drive pin 4.

[0041] Specifically, a spherical groove 24 is provided on the piston rod 21, and the arc surface 25 of the push block 22 is provided on the spherical groove 24. The reference surface 31 is synchronously abutted against multiple driving pins 4. The driving source drives the core shaft 2 to move toward the shaft member 5, driving multiple driving pins 4 to move toward the end surface of the shaft member 5. It can ensure that one or more driving pins 4 move synchronously toward the shaft member 5, so that it can have a stepped end surface or an inclined end surface with respect to the shaft member 5, and multiple driving pins 4 can be synchronously pressed against the end surface of the shaft member 5 for positioning, thereby greatly improving the clamping stability.

[0042] In one embodiment of the utility model, the length of the avoidance groove 42 is smaller than the length of the limiting groove 64. Specifically, the driving source drives the driving pin 4 to move toward the end face of the shaft 5, so that the driving pin 4 can push the positioning tip to move a certain distance toward the end face of the shaft 5. The limiting groove 64 limits the moving distance of the positioning rod 6, and the positioning tip pre-centers the end face of the shaft 5 to ensure the accuracy of subsequent centering, and the runout of the outer circle after processing is more accurate.

[0043] In an embodiment of the present utility model, a mounting block 43 is provided on the free end of the driving pin 4 , and a positioning tooth surface 44 is provided on the mounting block 43 . The cross section of the positioning tooth surface 44 is triangular or trapezoidal.

[0044] Specifically, the driving source drives the core shaft 2 to move toward the shaft 5, driving multiple driving pins 4 to move toward the end face of the shaft 5. The positioning tooth surface 44 set on the mounting block 43 and the end face of the shaft 5 are pressed against the end face of the shaft 5 to prevent the shaft 5 from rotating in the radial direction, thereby ensuring the clamping stability of the shaft 5.

[0045] Usage process

[0046] The mounting base 1 is assembled to the processing equipment, and the mounting base 1 is fixedly connected by fasteners (screws, etc.), and the mandrel 2 is connected to the driving source on the processing equipment. After the positioning top performs centering and positioning on the end face of the shaft member 5, the piston rod 21 on the pull rod is slidably arranged on the mounting cylinder 12, and a reference surface 31 is arranged on the push block 22, and the reference surface 31 is synchronously abutted with multiple driving pins 4. The driving source drives the mandrel 2 to move toward the direction of the shaft member 5, drives multiple driving pins 4 to move toward the end face of the shaft member 5, and abuts against the end face of the shaft member 5. The positioning top is used for centering, and the end face driving pin 4 is used to drive the workpiece, and the tailstock top on the processing equipment is used for top holding to perform external cylindrical processing. Compared with the traditional three-jaw chuck clamping, all external cylindrical surfaces can be processed, and the clamping surface cannot be processed during the traditional three-jaw clamping; the top centering better guarantees the runout of the external cylindrical surface after processing, and the precision is higher; it can be adapted to the front end of the telescopic chuck or directly installed on the lathe spindle to realize all external cylindrical surface processing. The utility model can complete the external cylindrical processing of the shaft at one time.

[0047] The above-described embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in the technical field on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.

Claims

1. A drive fixture for machining end faces of shaft workpieces, characterized in that: include: A mounting seat, on which a guide hole is provided; A positioning seat is arranged on the mounting seat, a fixing hole is arranged on the positioning seat, a positioning top is arranged on the fixing hole, and the positioning top is used to center and position the end face of the shaft; A driving pin is arranged on the positioning seat, a plurality of driving holes are evenly arranged on the positioning seat, the driving pin is slidably arranged on the driving hole, and the driving pin is used for secondary positioning of the end face of the shaft member; A core shaft is inserted into the guide hole, the core shaft is drivingly connected to the driving pin, and the core shaft is used to drive the driving pin to move toward the end face of the shaft member and press against the end face of the shaft member.

2. The end face driving fixture for machining shaft workpieces according to claim 1, characterized in that: The mounting seat is provided with a mounting tube, the positioning seat is provided with a fixing hole, the positioning seat is sleeved on the mounting tube, and the positioning seat is fixedly connected to the mounting seat by bolts.

3. The end face driving fixture for machining shaft workpieces as claimed in claim 2, characterized in that: A sliding groove is provided on the driving end of the driving pin, the shape of the sliding groove matches the inner side wall of the mounting tube, and the side wall of the sliding groove is arranged opposite to the edge of the mounting tube.

4. The end face driving fixture for machining shaft workpieces as claimed in claim 3, characterized in that: The free end of the driving pin is provided with an avoidance groove, the shape of which matches the edge of the positioning top, the side wall of the avoidance groove is arranged opposite to the positioning top, and the length of the sliding groove is greater than the length of the avoidance groove.

5. The end face driving fixture for machining shaft workpieces as claimed in claim 4, characterized in that: The positioning top comprises a positioning rod, a positioning cone head is arranged on the positioning rod, the positioning rod is slidably arranged on the fixing hole, and the positioning rod is sealed and connected to the fixing hole.

6. The end face driving fixture for machining shaft workpieces as claimed in claim 5, characterized in that: The positioning seat is provided with a limiting hole, the limiting hole is provided with a limiting bolt, the limiting bolt is provided with a limiting rod, the positioning rod is provided with a limiting groove, and the limiting rod is penetrated through the limiting groove.

7. The end face driving fixture for machining shaft workpieces as claimed in claim 2, characterized in that: The core shaft includes a pull rod, which is slidably arranged on the guide hole. A piston rod is provided at the free end of the pull rod, and the piston rod is slidably arranged on the mounting cylinder. The inner diameter of the mounting cylinder is larger than the inner diameter of the guide hole, and the outer diameter of the piston rod is larger than the outer diameter of the pull rod. A push block is provided on the piston rod, and the push block is connected to the driving pin.

8. The end face driving fixture for machining shaft workpieces as claimed in claim 7, characterized in that: The push block is provided with an arc surface, the piston rod is provided with a spherical groove, the arc surface is provided with a guide rod, the guide rod is passed through the piston rod, the arc surface of the push block is provided on the spherical groove, the push block is provided with a reference surface, and the reference surface abuts against the driving pin.

9. The end face driving fixture for machining a shaft workpiece according to claim 6, characterized in that: The length of the avoidance groove is smaller than the length of the limiting groove.

10. The end face driving fixture for machining a shaft workpiece according to claim 1, characterized in that: A mounting block is arranged on the free end of the driving pin, and a positioning tooth surface is arranged on the mounting block. The cross section of the positioning tooth surface is a triangle or a trapezoid.

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