Double-tensioning tire-expanding fixture
By designing a double tensioning clamp and using two combined claw expansion structures to automatically find the center of the circle, the problem of uneven processing of the inner hole blank is solved, the uniformity of the overall processing allowance of the part is achieved, and the processing accuracy and accuracy are improved. efficiency.
Patent Information
- Application Number
- CN202422675841.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-11-04
AI Technical Summary
During the turning process, the roughness and cylindricality in the pore blank state are poor, resulting in uneven cutting allowance, affecting the processing accuracy and efficiency.
Design a double tensioning jig that uses two combined claw expansion structures to automatically find the center of the circle, allowing the parts to rotate around the inner hole axis as the axis during processing, ensuring that the overall machining allowance of the parts is uniform.
Through the use of double tensioning clamps, the workpiece is closer to the actual processing axis, achieving uniformity of the overall machining allowance of the part, and improving processing accuracy and efficiency.
Smart Images
Figure CN222370414U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a double-tensioning and tire-expanding clamp, belonging to the technical field of tooling clamps for turning machine tools. Background Art
[0002] When turning the outer circle of cylindrical parts, the inner hole is completed in the previous processing, such as using gun drilling. After that, the inner hole on one side is supported and the chamfer of the hole on the other side is supported to clamp the parts, and then the outer circle is processed.
[0003] However, when the process arrangement is to process the outer circle first and then the inner hole, the inner hole is in a rough state at this time. When the roughness and cylindricity of the rough hole are not good, the one-support-one-top clamping method is used. It is impossible to ensure that the workpiece as a whole rotates on its own axis, resulting in uneven cutting allowance, affecting the processing accuracy and efficiency. Summary of the invention
[0004] The technical problem to be solved by the utility model is to provide a double-tension tire expansion fixture, which is provided with two tensioning positions, so as to find the rotation center of the part, so that the part can rotate with the inner hole axis as the axis during the processing, so as to achieve the technical effect of uniform overall processing allowance of the part.
[0005] In order to solve the above problems, the specific technical scheme of the utility model is as follows: a double tensioning and expanding tire clamp, the clamp body is a hollow cylindrical structure, the inner cavity is provided with a pull core, the left side of the pull core is connected to the pull rod, the right side of the pull core is fixedly connected to a truncated cone-shaped support block I, the left diameter of the support block I is smaller than the right diameter, a combined expansion claw I is provided on the outer circumference of the support block I, the inner surface of the combined expansion claw I contacts with the truncated cone surface of the support block I, the outer surface of the combined expansion claw I extends out of the clamp body and is supported on the inner circumference of the workpiece; a top core is provided on the right side of the support block I, a truncated cone-shaped support block II is provided in the middle of the top core, a combined expansion claw II is provided on the outer circumference of the support block II, the bottom of the combined expansion claw II contacts with the truncated cone surface of the support block II, the top of the combined expansion claw II extends out of the clamp body and is supported on the inner circumference of the workpiece; a cylindrical guide body is fixedly connected to the right end of the support block II, and a pin hole is provided at the center of the right end face of the cylindrical guide body.
[0006] The left end of the top core is a cylinder, a keyway is arranged on the outer circumference of the cylinder, a limiting screw is arranged at the corresponding position of the clamp body, and the limiting screw is slidably matched with the keyway.
[0007] The combined expansion claw I has the same structure as the combined expansion claw II, including expansion claws and spring rings evenly distributed around the circumference. The inner circumference of the combined expansion claw is truncated cone-shaped, and the outer circumference is cylindrical. An annular groove is provided on the outer circumference of the combined expansion claw, and the spring ring is connected together in the annular groove.
[0008] The right end surface of the clamp body is connected to the end cover through a sealing gasket, and the right end of the cylindrical guide body extends out from the end cover.
[0009] A limit platform is arranged near the left end of the fixture body, and the left end surface of the workpiece is limited on the limit platform.
[0010] A flange is arranged at the left end of the fixture body, the flange is connected to a transition plate, and the transition plate is connected to an external main shaft.
[0011] The double tensioning and tire expanding fixture of the present application adopts a two-position combined expansion claw structure, so that the inner hole of the clamped cylindrical part can automatically find the center of the circle at two positions within a certain distance, so that the clamped workpiece is closer to the actual processing axis, thereby making the overall processing allowance of the part uniform and further improving the processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the structure of a double tensioning and tire expanding fixture. DETAILED DESCRIPTION
[0013] like Figure 1 As shown, a double tensioning and expanding tire clamp, the clamp body 3 is a hollow cylindrical structure, the inner cavity is provided with a pull core 4, the left side of the pull core 4 is connected to the pull rod 1, the right side of the pull core 4 is fixedly connected to a truncated cone-shaped support block I10, the left diameter of the support block I10 is smaller than the right diameter, a combined expansion claw I11 is provided on the outer circumference of the support block I10, the inner surface of the combined expansion claw I11 is in contact with the truncated cone surface of the support block I10, the outer surface of the combined expansion claw I11 extends out of the clamp body 3 and is supported on the inner circumference of the workpiece; a top core 6 is provided on the right side of the support block I10, a truncated cone-shaped support block II12 is provided in the middle of the top core 6, a combined expansion claw II13 is provided on the outer circumference of the support block II12, the bottom of the combined expansion claw II13 is in contact with the truncated cone surface of the support block II12, the top of the combined expansion claw II13 extends out of the clamp body 3 and is supported on the inner circumference of the workpiece; a cylindrical guide body 5 is fixedly connected to the right end of the support block II12, and a pinhole 7 is provided at the center of the right end face of the cylindrical guide body 5.
[0014] The left end of the top core 6 is a cylinder, and a key groove 8 is provided on the outer circumference of the cylinder. A limit screw 9 is provided at the corresponding position of the clamp body 3. The limit screw 9 is slidably matched with the key groove 8. By setting the limit screw 9, the top core 6 does not rotate during the axial movement.
[0015] The combined expansion claw I11 has the same structure as the combined expansion claw II13, including expansion claws 1-1 and spring rings 1-2 evenly distributed around the circumference. The inner circumference of the combined expansion claw 1-1 is truncated cone-shaped, and the outer circumference is cylindrical. An annular groove is provided on the outer circumference of the combined expansion claw 1-1, and the spring ring 1-2 is connected together in the annular groove. The spring ring 1-2 plays a role of elastic return, so that the expansion claw 1-1 always has a radial retraction force after being expanded under force.
[0016] The right end surface of the clamp body 3 is connected to the end cover 15 through a sealing gasket 14, and the right end of the cylindrical guide body 5 extends out from the end cover 15. The sealing gasket 14 protects the inner cavity of the clamp body 3 to prevent impurities from entering and affecting the accuracy of the combined expansion claws.
[0017] A limit table 2 is provided near the left end of the fixture body 3, and the left end face of the workpiece is limited on the limit table 2; a flange 16 is provided at the left end of the fixture body 3, and the flange 16 is connected to a transition plate 17, and the transition plate 17 is connected to an external spindle. The structure of the flange 16 and the limit table 2 ensures that the machining reference of the left end side of the part is accurate.
[0018] The working process of the double tensioning and tire expanding fixture is as follows: when clamping the workpiece, first insert the workpiece as a whole into the fixture body 3, and the end face of the workpiece fits with the end face of the limit table 2 of the fixture body 3 to achieve axial positioning. The spindle cylinder pulls the pull core 4 through the pull rod 1, and the pull core 4 drives the combined expansion claw I11 to achieve the tensioning action through the inclined surface. At the same time, the tailstock top 10 presses the top core 6, and the top core 6 realizes the tensioning action through the inclined surface of the combined expansion claw II13, and finally the tensioning of the workpiece is achieved. When releasing the workpiece, the spindle cylinder pushes the pull core 4, so that there is no radial force between the pull core and the expansion claw 5, and at the same time, the spring ring 1-2 clamps the expansion claw 1-1 of the combined expansion claw I11 to retract to the position before tensioning, and at the same time, the tailstock top 10 retreats, and the pull core 4 presses the top core 6, so that the top core 6 retreats, and similarly, the spring ring 1-2 clamps the expansion claw 1-1 of the combined expansion claw II13 to retract to the position before tensioning.
Claims
1. A double tensioning tire expansion fixture, characterized in that: The fixture body (3) is a hollow cylindrical structure, and a pull core (4) is provided in the inner cavity. The left side of the pull core (4) is connected to the pull rod (1), and the right side of the pull core (4) is fixedly connected to a truncated cone-shaped support block I (10). The left diameter of the support block I (10) is smaller than the right diameter. A combined expansion claw I (11) is provided on the outer circumference of the support block I (10). The inner surface of the combined expansion claw I (11) contacts the truncated cone surface of the support block I (10), and the outer surface of the combined expansion claw I (11) extends out of the fixture body (3) and is supported on the inner circumference of the workpiece. A top core (6) is provided on the right side of I (10), a truncated cone-shaped support block II (12) is provided in the middle of the top core (6), a combined expansion claw II (13) is provided on the outer circumference of the support block II (12), the bottom of the combined expansion claw II (13) contacts the truncated cone surface of the support block II (12), and the top of the combined expansion claw II (13) extends out of the fixture body (3) and is supported on the inner circumference of the workpiece; a cylindrical guide body (5) is fixedly connected to the right end of the support block II (12), and a pinhole (7) is provided at the center of the right end surface of the cylindrical guide body (5).
2. The double tensioning tire expansion fixture according to claim 1, characterized in that: The left end of the top core (6) is a cylinder, a keyway (8) is provided on the outer circumference of the cylinder, a limit screw (9) is provided at a corresponding position of the clamp body (3), and the limit screw (9) is slidably matched with the keyway (8).
3. The double tensioning tire expansion fixture according to claim 1, characterized in that: The combined expansion claw I (11) has the same structure as the combined expansion claw II (13), comprising expansion claws (1-1) and spring rings (1-2) uniformly distributed around the circumference; the inner circumference of the combined expansion claw (1-1) is truncated cone-shaped, and the outer circumference is cylindrical; an annular groove is provided on the outer circumference of the combined expansion claw (1-1), and the spring rings (1-2) are connected together in the annular groove.
4. The double tensioning tire expansion fixture according to claim 1, characterized in that: The right end surface of the clamp body (3) is connected to the end cover (15) via a sealing gasket (14), and the right end of the cylindrical guide body (5) extends out from the end cover (15).
5. The double tensioning tire expansion fixture according to claim 1, characterized in that: A limit platform (2) is provided near the left end of the fixture body (3), and the left end surface of the workpiece is limited on the limit platform (2).
6. The double tensioning tire expansion fixture according to claim 5, characterized in that: A flange (16) is provided at the left end of the fixture body (3), the flange (16) is connected to a transition plate (17), and the transition plate (17) is connected to an external main shaft.