Machining tire expanding clamp
By designing a multi-clamp radial clamping structure for a machining expansion jig, the deformation problem of traditional jigs when clamping thin-walled cylindrical workpieces was solved, achieving stable clamping and positioning of the workpiece and ensuring machining accuracy.
Patent Information
- Application Number
- CN202423241162.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2034-12-27
AI Technical Summary
Traditional fixtures are prone to deformation or damage when clamping thin-walled cylindrical workpieces, affecting machining accuracy and surface quality.
Design a machining expansion clamp that uses a sleeve with a conical inner hole and a conical sleeve with a conical outer wall. The workpiece is radially clamped by the synchronous action of multiple clamping blocks. The pressure is reduced by the surface contact of the multiple clamping blocks, thus avoiding workpiece deformation.
It achieves effective clamping and positioning of thin-walled cylindrical workpieces, avoiding deformation or damage. At the same time, it has a simple structure, low cost, and is suitable for a wide range of applications.
Smart Images
Figure CN223790266U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a tooling fixture, and more particularly to a machined tire expansion fixture. Background Technology
[0002] When machining a product, it is first necessary to use tooling fixtures to position and fix the product to ensure the final machining accuracy. Traditionally, when clamping cylindrical or cylindrical workpieces, a three-jaw chuck or a similar clamping mechanism is generally used. However, for thin-walled cylindrical workpieces, traditional chucks or clamping mechanisms are very prone to causing workpiece deformation or surface pitting and damage during clamping, affecting its surface quality. On the other hand, if the clamping force is reduced, the workpiece may not be able to be fixed, thus affecting the subsequent machining accuracy.
[0003] Therefore, a method or apparatus is needed to solve the above problems. Utility Model Content
[0004] This utility model aims to address the aforementioned shortcomings of existing technologies by proposing a machining expansion clamp that is simple in structure, ingenious in design, and reasonable in layout, and can prevent deformation of thin-walled cylindrical workpieces while ensuring clamping effect.
[0005] The technical solution of this utility model is: a machined tire expansion clamp, characterized in that: the clamp includes an outer sleeve 1, the inner wall of the outer sleeve 1 is flared outwards (wider at the top and narrower at the bottom), a locking cone sleeve 2 is provided inside the outer sleeve 1, the locking cone sleeve 2 is composed of multiple clamping blocks 3 evenly distributed in the circumferential direction, a clamping gap 4 is left between adjacent clamping blocks 3, the clamping blocks 3 are composed of two interconnected parts: a horizontal part 5 and a vertical part 6, the outer side of the vertical part 6 is an inclined guide surface 7, the inclined guide surface 7 is at the same inclination angle as the inner wall of the outer sleeve 1.
[0006] A drive screw 8 is threadedly connected to the bottom plate of the outer sleeve 1. A hexagonal hole 9 is formed on the top surface of the drive screw 8. A pressure ring 10 is located in the middle of the drive screw 8, positioned above and in contact with the free ends of all horizontal portions 5. A clearance hole 11 is also provided on the horizontal portion 5, and a support column 12 connected to the outer sleeve 1 is disposed within the clearance hole 11. The height of the top surface of the support column 12 is higher than the height of the top surface of the horizontal portion 5.
[0007] A connecting flange 13 is also sleeved around the drive screw 8. The connecting flange 13 is connected to a threaded sleeve 15 by multiple upper bolts 14, and the threaded sleeve 15 is fixedly connected to the bottom plate of the outer sleeve 1 by multiple lower bolts 16. An internal threaded hole 17 communicating with the cavity where the drive screw 8 is located is opened at the center of the connecting flange 13.
[0008] The internal threaded hole 17 is internally threaded to a clamping stud 18. The lower part of the clamping stud 18 is threaded to the internal threaded hole 17, and the top of it is connected to a clamping sleeve 19. A tightening wrench 20 is provided in conjunction with the clamping sleeve 19. The top of the tightening wrench 20 has a radial groove, and a handle 21 is movably inserted in the radial groove. The top surface of the clamping sleeve 19 is provided with two countersunk grooves 22, and the bottom surface of the tightening wrench 20 is provided with a protrusion 23 that matches the countersunk grooves 22.
[0009] The inner wall of the outer sleeve 1 forms a 15° angle with the vertical direction.
[0010] Compared with the prior art, this utility model has the following advantages:
[0011] This type of machining expansion clamp boasts a simple structure, ingenious design, and rational layout. Addressing the common issue of deformation or breakage when clamping thin-walled cylindrical workpieces using traditional chuck and jaw clamps, it employs a unique structure. It utilizes a sleeve with a conical inner hole, in conjunction with a conical sleeve with a conical outer wall, to achieve simultaneous and synchronous movement of multiple clamping blocks. This transforms longitudinal linear motion into radial movement of multiple clamping blocks, allowing them to contact and clamp the workpiece's outer wall, thus achieving clamping and positioning. This multi-block, surface-contact clamping method results in a larger contact area and lower pressure between the clamp and the workpiece, ensuring proper positioning and clamping while preventing deformation or damage. Furthermore, its simple manufacturing process and low cost make it highly advantageous and suitable for widespread application in this field, with a promising market prospect. Attached Figure Description
[0012] Figure 1 This is a structural schematic diagram of an embodiment of the present invention (workpiece clamping state).
[0013] Figure 2 This is a structural schematic diagram of an embodiment of the present invention (without the workpiece being clamped).
[0014] Figure 3 This is a three-dimensional structural schematic diagram of an embodiment of the present utility model. Detailed Implementation
[0015] The specific embodiments of this utility model will be described below with reference to the accompanying drawings. Figure 1 , Figure 2 , Figure 3The image shows a machined tire expansion clamp, comprising an outer sleeve 1. The inner wall of the outer sleeve 1 is flared, wider at the top and narrower at the bottom. A locking cone sleeve 2 is disposed inside the outer sleeve 1. The locking cone sleeve 2 is composed of multiple clamping blocks 3 evenly distributed in the circumferential direction, with clamping gaps 4 between adjacent clamping blocks 3. Each clamping block 3 consists of two interconnected parts: a horizontal part 5 and a vertical part 6. The outer side of the vertical part 6 is an inclined guide surface 7, and the inclined guide surface 7 has the same inclination angle as the inner wall of the outer sleeve 1.
[0016] A drive screw 8 is threadedly connected to the bottom plate of the outer sleeve 1. A hexagonal hole 9 is formed on the top surface of the drive screw 8. A pressure ring 10 is located in the middle of the drive screw 8, positioned above and in contact with the free ends of all horizontal portions 5. A clearance hole 11 is also provided on the horizontal portion 5, and a support column 12 connected to the outer sleeve 1 is disposed within the clearance hole 11. The height of the top surface of the support column 12 is higher than the height of the top surface of the horizontal portion 5.
[0017] A connecting flange 13 is also sleeved around the drive screw 8. The connecting flange 13 is connected to a threaded sleeve 15 by multiple upper bolts 14, and the threaded sleeve 15 is fixedly connected to the bottom plate of the outer sleeve 1 by multiple lower bolts 16. An internal threaded hole 17 communicating with the cavity where the drive screw 8 is located is opened at the center of the connecting flange 13.
[0018] The internal threaded hole 17 is internally threaded to a clamping stud 18. The lower part of the clamping stud 18 is threaded to the internal threaded hole 17, and the top of it is connected to a clamping sleeve 19. A tightening wrench 20 is provided in conjunction with the clamping sleeve 19. The top of the tightening wrench 20 has a radial groove, and a handle 21 is movably inserted in the radial groove. The top surface of the clamping sleeve 19 is provided with two countersunk grooves 22, and the bottom surface of the tightening wrench 20 is provided with a protrusion 23 that matches the countersunk grooves 22.
[0019] The inner wall of the outer sleeve 1 forms a 15° angle with the vertical direction.
[0020] The working process of the machined expansion clamp of this utility model embodiment is as follows: When it is necessary to clamp the thin-walled cylindrical workpiece 24, firstly, the workpiece 24 is sleeved inside the locking cone sleeve 2. At this time, the multiple clamping blocks 3 that make up the locking cone sleeve 3 are not in contact with the outer wall of the workpiece 24. Then, the operator inserts an internal hex wrench into the internal threaded hole 17 opened at the center of the connecting flange 13 to operate. The end of the internal hex wrench is inserted into the internal hexagonal hole 9 on the top surface of the drive screw 8, and the drive screw 8 is rotated. Since the bottom of the drive screw 8 is threadedly connected to the outer sleeve 1, the drive screw... When the screw 8 rotates, it will move downward along the axis. The pressure ring 10 on it will press down on the horizontal part 5 of all the clamping blocks 3. That is, all the clamping blocks 3 will move downward relative to the outer sleeve 1 under the action of the drive screw 8. Since the outer wall of the clamping block 3 and the inner wall of the outer sleeve 1 are inclined planes with an angle of 15° to the vertical direction, under the guidance of the flared inner wall of the outer sleeve 1, all the clamping blocks 3 will move simultaneously and synchronously along the radial direction towards the workpiece 24, thereby clamping the workpiece 24. The bottom of the workpiece 24 is supported by the support column 12.
[0021] In the clamped state, the inner wall of the vertical part 6 on each clamping block 3 will contact the outer side of the workpiece 24. This clamping structure can ensure that the clamping force from all directions is uniform and equal in magnitude. Firstly, it can ensure the clamping effect, and secondly, due to the increased contact area, it can effectively prevent the thin-walled workpiece 24 from undergoing local deformation.
[0022] After clamping the workpiece 24 horizontally using the locking cone sleeve 2, place the clamping stud 18 at the internal threaded hole 17, insert the protrusion 23 at the bottom of the tightening wrench 20 into the countersunk groove 22 on the clamping sleeve 19, and then drive the tightening wrench 20 to rotate through the handle 21, causing the clamping sleeve 19 and the clamping stud 18 to rotate together relative to the internal threaded hole 17. The clamping sleeve 19 and the clamping stud 18 rotate and move downwards until the edge of the clamping sleeve 19 is pressed into the positioning countersunk groove on the partition plate 25 in the middle of the workpiece 24. At this point, the longitudinal positioning of the workpiece 24 is achieved. Thus, the positioning of the workpiece 24 is completed. Remove the tightening wrench 20, and the workpiece 24 can be machined.
[0023] After processing is completed, reverse the above actions, unlock workpiece 24, remove the processed workpiece 24, and then re-clamp a new workpiece 24.
Claims
1. A machine tire bulging clamp, characterized by: The clamp comprises an outer sleeve (1), the inner wall of which is in the shape of a trumpet mouth with the upper part larger and the lower part smaller, a locking taper sleeve (2) is arranged in the outer sleeve (1), the locking taper sleeve (2) is composed of a plurality of clamping blocks (3) uniformly distributed in the circumferential direction, a clamping gap (4) is left between adjacent clamping blocks (3), the clamping block (3) is composed of a horizontal part (5) and a vertical part (6) connected to each other, the outer side of the vertical part (6) is an inclined guide surface (7) which is consistent with the inclination angle of the inner wall of the outer sleeve (1), A driving screw (8) is threadedly connected to the bottom plate of the outer sleeve (1), an inner hexagonal hole (9) is formed in the top end surface of the driving screw (8), a pressing ring (10) is arranged in the middle part of the driving screw (8), the pressing ring (10) is located above the free end of all horizontal parts (5) and is in contact with them, a clearance hole (11) is further arranged on the horizontal part (5), a support column (12) connected to the outer sleeve (1) is arranged in the clearance hole (11), the height of the top end surface of the support column (12) is higher than that of the horizontal part (5), A connecting flange (13) is further sleeved on the driving screw (8), the connecting flange (13) is connected with a threaded sleeve (15) through a plurality of upper bolts (14), and the threaded sleeve (15) is fixedly connected with the bottom plate of the outer sleeve (1) through a plurality of lower bolts (16), an inner threaded hole (17) which is in communication with the cavity where the driving screw (8) is located is formed in the center of the connecting flange (13), A pressing stud (18) is threadedly connected in the inner threaded hole (17), the lower part of the pressing stud (18) is threadedly connected with the inner threaded hole (17), and the top part of the pressing stud (18) is connected with a pressing sleeve (19), a tightening wrench (20) matched with the pressing sleeve (19) is arranged, a radial slot is formed in the top part of the tightening wrench (20), a handle (21) is movably inserted into the radial slot, two recesses (22) are arranged on the top end surface of the pressing sleeve (19), and a protrusion (23) matched with the recesses (22) is arranged on the bottom end surface of the tightening wrench (20).
2. A tire building fixture as set forth in claim 1, further comprising: The inner wall of the outer sleeve (1) and the vertical direction form an included angle of 15°.