Clamp for stainless steel joint production

Abstract

The utility model discloses a clamp for stainless steel joint production, which comprises an inner collet chuck and an outer collet chuck movably sleeved outside the inner collet chuck, and a plurality of chucks are arranged at the head of the inner collet chuck. S-shaped grooves are formed in the chuck and the conical surface, so that clamping force is distributed more uniformly, and linear clamping damage to the surface of a workpiece is effectively avoided; meanwhile, the wear-resistant block is additionally arranged to reduce conical surface wear, and the wear-resistant block is detachable, replaceable and convenient to maintain; in addition, the outer collet comprises a driving barrel and a pressing barrel which can move relatively, when the wear-resisting block is worn, the pressure of the conical groove on the conical surface can be kept by adjusting the position of the pressing barrel, the clamping effect of the clamp is ensured, and the machining quality and efficiency of stainless steel joint production are improved.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, specifically to a fixture for the production of stainless steel joints. Background Technology

[0002] When stainless steel joints undergo precision machining such as grinding and turning, they generally require the use of a three-jaw chuck or collet for fixation. Existing collets, such as the collet assembly disclosed in Chinese invention patent with authorization announcement number CN113492325B, include a collet body with at least one groove on the side. When an external force is applied to the conical surface of the collet, the crack in the groove becomes smaller, causing several separate chucks to come together and clamp the workpiece.

[0003] However, with existing technology, because the groove is straight, the stress around the workpiece is concentrated when the workpiece is clamped by the chuck, making it easy for straight scratches to be formed on the workpiece surface. In addition, the collet chuck relies on external force acting on the conical surface, which is prone to wear due to friction after long-term use, resulting in a reduction in the clamping force of the chuck and difficulty in effectively clamping the workpiece.

[0004] In view of this, the present invention proposes a fixture for the production of stainless steel joints to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a fixture for the production of stainless steel joints, so as to solve the problem that the existing collet clamps are prone to producing straight-line scratches on the surface of the workpiece due to the straight groove design.

[0006] This utility model provides the following technical solution: a fixture for producing stainless steel joints, including an inner clamp and an outer clamp movably sleeved outside the inner clamp. The head of the inner clamp is provided with a plurality of chucks, and a plurality of grooves are formed between the sides of the plurality of chucks. The side of the inner clamp near the chucks is integrally formed with a conical surface. The inner side of the outer clamp is provided with a conical groove corresponding to the conical surface. The grooves located in the cylindrical part of the inner clamp are straight grooves. The grooves located at the chucks and the conical surface are provided with S-shaped grooves that connect with the straight grooves.

[0007] Preferably, the number of clamps is 2-4.

[0008] Preferably, a wear-resistant block is fixed to the surface of the conical surface, the end of the wear-resistant block away from the chuck smoothly transitions to the conical surface, and the side of the wear-resistant block near the chuck protrudes from the surface of the conical surface.

[0009] Preferably, the wear-resistant block is welded and fixed to the conical surface.

[0010] Preferably, the surface of the conical surface is provided with an installation groove, the wear-resistant block is embedded in the installation groove, and the wear-resistant block is fixed to the bottom of the installation groove by a countersunk bolt.

[0011] Preferably, the outer collet includes a driving cylinder and a clamping cylinder, the tapered groove is disposed on the inner wall of the clamping cylinder, the driving cylinder is slidably sleeved on the cylinder portion of the inner collet, and the clamping cylinder is configured to be movable relative to the axial direction of the driving cylinder.

[0012] Preferably, the outer wall of the rear end of the clamping cylinder is threadedly connected to the inner wall of the front end of the driving cylinder.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a fixture for the production of stainless steel joints. By optimizing the groove structure and setting S-shaped grooves at the chuck and conical surface, the clamping force distribution is more uniform, effectively avoiding straight-line clamping damage to the workpiece surface. At the same time, wear-resistant blocks are added to reduce wear on the conical surface, and the wear-resistant blocks are removable and replaceable for convenient maintenance. In addition, the outer cylinder clamp includes a drive cylinder and a clamping cylinder that can move relative to each other. When the wear-resistant blocks wear, the pressure of the conical groove on the conical surface can be maintained by adjusting the position of the clamping cylinder, ensuring the clamping effect of the fixture and improving the processing quality and efficiency of stainless steel joint production. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a schematic diagram of the installation structure of the wear-resistant block of this utility model.

[0016] Figure 3 This is a three-dimensional structural diagram of the inner cylinder clamp of this utility model.

[0017] In the diagram: 1. Mounting groove; 2. Wear-resistant block; 3. Groove; 4. Inner collet; 5. Clamp; 6. Clamping cylinder; 7. Conical surface; 8. Drive cylinder; 9. Outer collet; 10. S-groove; 11. Countersunk bolt; 12. Conical groove. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-3 .

[0020] Example 1

[0021] A fixture for producing stainless steel joints includes an inner collet 4 and an outer collet 9 movably sleeved outside the inner collet 4. The head of the inner collet 4 is provided with several chucks 5 for clamping stainless steel workpieces, and several grooves 3 are formed between the sides of the chucks 5. A conical surface 7 is integrally formed on the side of the inner collet 4 near the chucks 5. The inner side of the outer collet 9 is provided with a conical groove 12 corresponding to the conical surface 7. The outer collet 9 is configured to move along the axis of the inner collet 4 under external force. When the outer collet 9 moves towards the front end of the inner collet 4, i.e., towards the chucks 5, it passes through the conical groove 12. 2. Apply pressure to the conical surface 7 to bring several chucks 5 closer together and narrow the crack in the groove 3. The above is a common collet structure in the prior art. For example, when changing the drill bit with an electric drill, you can first manually push the outer collet 9 backward. The multiple chucks 5 will automatically open outward under their own elastic force. After inserting the drill bit into several chucks 5, release the outer collet 9. Then, under the action of external force (usually a spring, which is not shown in the figure because it is prior art), the outer collet 9 will automatically move towards the chucks 5 and apply pressure to the conical surface 7 through the conical groove 12 to make the chucks 5 clamp the drill bit. This will not be described in detail here.

[0022] Regarding the existing technology, the groove 3 is generally a straight line structure. When several chucks 5 approach each other, the clamping force is mainly distributed along the straight direction of the crack. This may cause the workpiece to be subjected to uneven force during clamping, especially on the finished outer cylindrical surface, which is prone to clamping damage. To solve the above problems, the main innovation of this utility model is as follows:

[0023] The groove 3 located on the cylindrical part of the inner cylinder clamp 4 is a straight groove. The groove 3 located at the position of the chuck 5 and the conical surface 7 is provided with an S-shaped groove 10 connected to the straight groove. By setting the S-shaped groove 10, the clamping force is distributed on multiple branches of the crack. This distribution method is more uniform and dispersed, thereby reducing the pressure on the workpiece locally and reducing the risk of the workpiece surface being damaged by clamping.

[0024] The number of clamps 5 is 2-4.

[0025] Example 2

[0026] It is understandable that the opening of the chuck 5 depends on the elasticity of its own metal, and the closing of the chuck 5 depends on the pressure of the conical groove 12 on the conical surface 7. When the conical groove 12 applies pressure to the conical surface 7, a relatively large amount of friction will inevitably occur, which can easily lead to wear on the conical surface 7. Once the conical surface 7 is severely worn, the clamping force of the chuck 5 will decrease, making it difficult to clamp the workpiece. Therefore, Embodiment 2 makes the following innovations based on Embodiment 1:

[0027] A wear-resistant block 2 is fixed to the surface of the conical surface 7. The surface of the wear-resistant block 2 away from the chuck 5 smoothly transitions with the conical surface 7, and the side of the wear-resistant block 2 close to the chuck 5 protrudes from the surface of the conical surface 7. By smoothly transitioning one end of the wear-resistant block 2 with the conical surface 7, the inner surface of the conical surface 12 can slide relatively smoothly on the surface of the wear-resistant block 2. By protruding the other end of the wear-resistant block 2 from the surface of the conical surface 7, the conical surface 12 avoids direct friction with the conical surface 7.

[0028] In this embodiment, the wear-resistant block 2 is welded and fixed to the conical surface 7.

[0029] It is understandable that when the conical surface 7 remains unchanged, the closer the conical groove 12 is to the conical surface 7, the greater the pressure on the chuck 5. When the wear-resistant block 2 wears, the pressure on the chuck 5 will also decrease. In order to maintain the pressure of the conical groove 12 on the conical surface 7 when the wear-resistant block 2 wears, the outer collet 9 includes a drive cylinder 8 and a clamping cylinder 6. The conical groove 12 is set on the inner wall of the clamping cylinder 6. The drive cylinder 8 is slidably sleeved on the cylinder part of the inner collet 4. The clamping cylinder 6 is set to be able to move relative to the axial direction of the drive cylinder 8. In this way, when the wear-resistant block 2 wears, the position of the clamping cylinder 6 can be adjusted appropriately to make the conical groove 12 closer to the conical surface 7 to maintain the pressure on the conical surface 7.

[0030] In this embodiment, the outer wall of the rear end of the clamping cylinder 6 is threadedly connected to the inner wall of the front end of the driving cylinder 8.

[0031] With the above structure, when the wear-resistant block 2 is worn, it can rotate towards the front end of the drive cylinder 8 to press the cylinder 6, so that the conical groove 12 maintains pressure on the conical surface 7.

[0032] Example 3

[0033] The structure of Embodiment 3 is roughly the same as that of Embodiment 2. The difference is that the wear-resistant block 2 is detachably fixed on the conical surface 7. Specifically, the surface of the conical surface 7 is provided with an installation groove 1, and the wear-resistant block 2 is embedded in the installation groove 1. The wear-resistant block 2 is fixed to the bottom of the installation groove 1 by a countersunk bolt 11. In this way, the wear-resistant block 2 can be easily replaced when it is worn to a certain extent.

[0034] In summary, this utility model, by setting an S-shaped groove 10 connected to the straight groove at the position of the groove 3 of the inner collet 4 at the position of the chuck 5 and the conical surface 7, makes the clamping force distribution more uniform and dispersed, effectively reducing the pressure on the workpiece locally and reducing the risk of the workpiece surface being damaged by clamping. At the same time, the wear-resistant block 2 is set on the conical surface 7, which reduces the wear of the conical surface 7, extends the service life of the fixture, and the wear-resistant block 2 is detachable and fixed for easy replacement. In addition, the outer collet 9 includes a drive cylinder 8 and a clamping cylinder 6 that can move relative to each other. When the wear-resistant block 2 wears, the pressure of the conical groove 12 on the conical surface 7 can be maintained by adjusting the position of the clamping cylinder 6, ensuring the clamping effect of the fixture and improving the processing quality and efficiency of stainless steel joint production.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fixture for producing stainless steel joints, comprising an inner clamp (4) and an outer clamp (9) movably sleeved outside the inner clamp (4), wherein the head of the inner clamp (4) is provided with a plurality of clamps (5), and a plurality of grooves (3) are formed between the sides of the plurality of clamps (5), and a conical surface (7) is integrally formed on the side of the inner clamp (4) near the clamps (5), and the inner side of the outer clamp (9) is provided with a conical groove (12) corresponding to the conical surface (7), characterized in that: The groove (3) located on the cylindrical part of the inner cylinder clamp (4) is a straight groove, and the groove (3) located on the clamp (5) and the conical surface (7) is provided with an S-shaped groove (10) that connects to the straight groove.

2. A clamp for producing a stainless steel joint as set forth in claim 1, characterized in that: The number of clamps (5) is 2-4.

3. The clamp for producing a stainless steel joint according to claim 1, wherein: A wear-resistant block (2) is fixed to the surface of the conical surface (7). The surface of the wear-resistant block (2) away from the chuck (5) smoothly transitions to the conical surface (7), and the side of the wear-resistant block (2) close to the chuck (5) protrudes from the surface of the conical surface (7).

4. A clamp for producing a stainless steel joint as set forth in claim 3, wherein: The wear-resistant block (2) is welded and fixed to the conical surface (7).

5. The clamp for producing a stainless steel joint as set forth in claim 3, wherein: The surface of the conical surface (7) is provided with an installation groove (1), and the wear-resistant block (2) is embedded in the installation groove (1). The wear-resistant block (2) is fixed to the bottom of the installation groove (1) by a countersunk bolt (11).

6. A jig for producing a stainless steel joint as set forth in claim 4 or 5, characterized by: The outer collet (9) includes a driving cylinder (8) and a clamping cylinder (6). The tapered groove (12) is provided on the inner wall of the clamping cylinder (6). The driving cylinder (8) is slidably sleeved on the cylinder part of the inner collet (4). The clamping cylinder (6) is configured to be able to move relative to the axial direction of the driving cylinder (8).

7. A fixture for producing stainless steel joints as described in claim 6, characterized in that: The outer wall of the rear end of the clamping cylinder (6) is threadedly connected to the inner wall of the front end of the driving cylinder (8).

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