Clamp for plasma polishing

Abstract

The utility model discloses a clamp for plasma polishing, which comprises a clamping seat, a main clamping rod, a distribution disc, a plurality of branch clamping rods and a clamping device, and the clamping seat, the main clamping rod, the distribution disc, the branch clamping rods and the clamping device are all made of metal plates. One end of the clamping base is provided with a connecting end used for being connected with the positive electrode of a power source, the distribution disc is provided with a plurality of evenly-distributed distribution holes, the two opposite ends of the branch clamping rod are provided with an upper through groove and a lower through groove, the number of the clamping devices is at least two, and the clamping devices are fixedly installed on the upper through groove and the lower through groove respectively so as to be used for clamping and fixing a metal tree in a matched mode. The clamp is connected with the positive electrode of the power supply through the clamping seat, and then current is uniformly guided to the metal tree through the main clamping rod, the distribution disc, the branch clamping rods, the clamping devices and other structures, so that the polishing uniformity of all parts of the metal tree is improved, and the uniform and consistent polishing effect can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of clamps, in particular to a clamp for plasma polishing. Background Art

[0002] Plasma polishing is a new type of electropolishing technology different from traditional electrolytic polishing. Its basic principle is that when the polishing workpiece enters the polishing liquid, the two are in direct contact and an instantaneous short circuit occurs, causing a large amount of heat release to vaporize the polishing liquid. A vaporization layer mainly composed of water vapor is formed between the polishing liquid and the workpiece, which significantly increases the resistance between them. Under the action of high voltage, the vaporization layer is locally ionized and broken down to form a discharge channel, generating oxygen plasma. The oxygen plasma hits the workpiece surface at high speed, causing the micro-area on the workpiece surface to melt rapidly, or react to form an oxidized loose layer. The high concentration of water vapor and oxygen bubbles will generate a tangential cavitation force when they collapse. The molten droplets and oxidized loose layer on the workpiece surface are peeled off under the action of the tangential cavitation force, reducing the surface roughness of the workpiece and achieving a polishing effect.

[0003] During traditional electrolytic polishing, the workpiece surface is selectively dissolved under the action of the electric field. During this process, there is no mechanical scouring effect on the workpiece, so it is relatively easy to fix the workpiece. Generally, the workpiece is hung on the fixture and placed in the electrolyte. However, plasma polishing is different from traditional electrolytic polishing. During the polishing process, a large number of bubbles burst, generating tangential cavitation force to impact the workpiece surface. If the workpiece is not hung properly, problems such as workpiece falling, partial discharge burning, and uneven polishing will occur. The existing plasma polishing fixture is made of stainless steel wire to make an elastic fixture, and the workpiece is clamped by the elastic force of the steel wire. This fixture can meet the requirements when used for polishing closed-loop single workpieces such as rings and bracelets, but it cannot meet the requirements of fastening and uniform discharge when polishing metal trees with large volume, heavy weight, and irregular size and structure. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a fixture for plasma polishing to solve the above-mentioned traditional problems.

[0005] The utility model is implemented by the following technical solutions:

[0006] A clamp for plasma polishing, comprising a clamping seat, a main clamping rod connected to the clamping seat, a distribution plate installed on the main clamping rod, a plurality of sub-clamping rods installed on the distribution plate, and a clamp installed on the sub-clamping rods, wherein the clamping seat, the main clamping rod, the distribution plate, the sub-clamping rods and the clamp are all made of metal plates; the clamping seat is provided with a connection end for connecting to the positive pole of a power supply at one end away from the main clamping rod, the distribution plate is provided with a plurality of evenly distributed distribution holes for installing the sub-clamping rods, and the opposite ends of the sub-clamping rods are provided with upper through grooves and lower through grooves, the number of the clamps is at least 2, and each of the clamps is respectively fixedly mounted on the upper through groove and the lower through groove to cooperate in clamping and fixing a metal tree.

[0007] Preferably, the metal plate is a 304 stainless steel plate or a 316 stainless steel plate.

[0008] Preferably, the surfaces of non-connecting parts of the clamping seat, the main clamping rod, the distribution plate, the sub-clamping rod and the clamper are all coated with insulating rubber.

[0009] Preferably, the insulating rubber is polyurethane rubber.

[0010] Preferably, the clamping seat is provided with an assembly hole and a first fastening bolt at one end close to the main clamping rod, one end of the main clamping rod is inserted into the assembly hole and the main clamping rod is positioned by the first fastening bolt.

[0011] Preferably, the main clamping rod is in a plate shape.

[0012] Preferably, the distribution plate is in a disc shape or a polygonal shape, and the distribution plate and the sub-clamping rod are fixed by a second fastening bolt.

[0013] Preferably, the upper through groove and the lower through groove are both in a strip shape.

[0014] Preferably, the clamp includes a connecting rod, an elastic clip, a third fastening bolt and a fourth fastening bolt, the elastic clip is arranged at one end of the connecting rod, the third fastening bolt and the fourth fastening bolt are arranged at the other end of the connecting rod, the elastic clip is made of spring steel mesh, the other end of the connecting rod is provided with a thread, the third fastening bolt cooperates with the fourth fastening bolt to fix and clamp respectively on the opposite sides of the sub-clamping rod.

[0015] Preferably, the elastic clip is configured as a vertical cylinder with a height of 5 to 10 mm and an inner diameter 1 to 2 mm smaller than the diameter of the metal trunk.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The plasma polishing fixture of the utility model is connected to the positive pole of the power supply through the coordination of the clamping seat, the main clamping rod, the distribution plate, the sub-clamping rod and the clamping device, and then the current is evenly guided to the metal tree through the main clamping rod, the distribution plate, the sub-clamping rod and the clamping device, so as to improve the polishing uniformity of various parts of the metal tree, so that it can obtain a uniform polishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the plasma polishing fixture of the utility model.

[0019] In the figure: 10, clamping seat; 20, main clamping rod; 30, distribution plate; 40, sub-clamping rod; 50, clamper; 51, elastic clip. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0021] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0022] In the description of the present utility model, it is necessary to understand that when an element is considered to be "connected" to another element, it may be directly connected to another element or there may be intermediate elements at the same time. On the contrary, when an element is said to be "directly" connected to another element, there are no intermediate elements.

[0023] See also Figure 1, which is a plasma polishing fixture of a preferred embodiment of the utility model, is used to clamp and fix metal trees such as jewelry casting trees, and then immerse them in plasma polishing liquid for subsequent plasma polishing process. Specifically, the fixture includes a clamping seat 10, a main clamping rod 20 connected to the clamping seat 10, a distribution plate 30 installed on the main clamping rod 20, a plurality of sub-clamping rods 40 installed on the distribution plate 30, and a clamp 50 installed on the sub-clamping rod 40. The clamping seat 10, the main clamping rod 20, the distribution plate 30, the sub-clamping rod 40, and the clamp 50 are all made of metal plates; the end of the clamping seat 10 away from the main clamping rod 20 is provided with a connection end for connecting to the positive pole of the power supply, and the distribution plate 30 is provided with a plurality of evenly distributed distribution holes for installing the sub-clamping rod 40, and the opposite ends of the sub-clamping rod 40 are provided with an upper through groove and a lower through groove. The number of the clamps 50 is at least 2, and each clamp 50 is fixedly installed on the upper through groove and the lower through groove respectively to cooperate in clamping and fixing the metal tree.

[0024] The above-mentioned plasma polishing fixture is connected to the positive pole of the power supply through the clamping seat 10 through the cooperation of structures such as the clamping seat 10, the main clamping rod 20, the distribution plate 30, the sub-clamping rod 40 and the clamp 50, and then the current is evenly drained to the metal tree through the main clamping rod 20, the distribution plate 30, the sub-clamping rod 40 and the clamp 50, so as to improve the polishing uniformity of various parts of the metal tree so that it can obtain a uniform and consistent polishing effect.

[0025] In this embodiment, the metal plate is a 304 stainless steel plate or a 316 stainless steel plate. Preferably, the surfaces of the non-connected parts of the clamping seat 10, the main clamping rod 20, the distribution plate 30, the sub-clamping rod 40, and the clamp 50 are all coated with insulating rubber to reduce the polishing loss of these parts. Specifically, the insulating rubber is polyurethane rubber.

[0026] In one embodiment, the clamping seat 10 is provided with an assembly hole and a first fastening bolt at one end close to the main clamping rod 20, one end of the main clamping rod 20 is inserted into the assembly hole and the main clamping rod 20 is positioned by the first fastening bolt. Optionally, the main clamping rod 20 is plate-shaped, and the length of the main clamping rod 20 and the clamping seat 10 can be adjusted by adjusting the length of the main clamping rod 20 in the assembly hole. The connection between the main clamping rod 20 and the distribution plate 30 can be fixed by bottom bolts or welding or other connection structures.

[0027] In another embodiment, the distribution plate 30 is substantially in the shape of a disk or a polygon, so that each sub-clamping rod 40 can be evenly spaced after installation, so that the device can clamp multiple metal trees at one time to improve the polishing yield. Optionally, the distribution plate 30 and the sub-clamping rod 40 are fixed by a second fastening bolt.

[0028] In this embodiment, the upper through groove and the lower through groove are both in the shape of strips, so as to facilitate adjusting the clamping position according to the length of the metal tree to adapt to the height of the metal tree. In one embodiment, the clamp 50 includes a connecting rod, an elastic clip 51, a third fastening bolt and a fourth fastening bolt. The elastic clip 51 is arranged at one end of the connecting rod and can be fixed to the connecting rod by welding or other fixing methods. The third fastening bolt and the fourth fastening bolt are arranged at the other end of the connecting rod. The elastic clip 51 is made of corrosion-resistant spring steel mesh, so that it has good elasticity and avoids large shielding of the clamping part to affect the polishing of the part. In one embodiment, the elastic clip 51 is set to a vertical cylindrical shape with a height of 5 to 10 mm and an inner diameter 1 to 2 mm smaller than the diameter of the metal tree trunk. The other end of the connecting rod is provided with a thread, and the third fastening bolt cooperates with the fourth fastening bolt to be fixed and clamped on the opposite sides of the sub-clamping rod 40 respectively.

[0029] When in use, after flushing the plaster on the jewelry casting tree, fix it on the clamp, wherein the elastic clip 51 clamps the bottom and top of the trunk respectively, and then inserts the connecting rod into the slide groove of the sub-clamping rod 40 for positioning and tightening. Assemble the sub-clamping rod 40 onto the distribution plate 30. Then assemble the main clamping rod 20 together with the distribution plate 30 onto the clamping seat 10. Assemble the remaining metal trees in the same way. After setting up a suitable plasma polishing process for polishing and cleaning, remove the hanger from the electrolyte polishing liquid, rinse it, and break open the elastic clip 51 to remove the metal tree, which is convenient and quick. Among them, the clamp 50 is only equipped with one of the sub-clamping rods 40, and the others are assembled as needed.

[0030] The above-mentioned plasma polishing fixture is designed as an adjustable locking ring type locking device according to the plasma polishing principle and the structural characteristics of the cast metal tree, which can conveniently lock the top and bottom ends of the tree trunk respectively, and an adjustable structure is set on the crossbeam of the locking device, which can be suitable for polishing metal trees of different heights and contours. At the same time, the parts other than the locking device are wrapped with heat-resistant insulating glue to reduce the influence of the fixture itself on the distribution of polishing current. The fixture of the present application can be used to conveniently fix the jewelry casting metal tree, improve the polishing uniformity of each part of the cast tree, and obtain a uniform and consistent polishing effect.

[0031] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0032] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A fixture for plasma polishing, characterized in that: It includes a clamping seat, a main clamping rod connected to the clamping seat, a distribution plate installed on the main clamping rod, a plurality of sub-clamping rods installed on the distribution plate, and a clamp installed on the sub-clamping rod, wherein the clamping seat, the main clamping rod, the distribution plate, the sub-clamping rod and the clamp are all made of metal plates; an end of the clamping seat away from the main clamping rod is provided with a connection end for connecting to the positive pole of a power supply, the distribution plate is provided with a plurality of evenly distributed distribution holes for installing the sub-clamping rods, and upper through grooves and lower through grooves are provided at opposite ends of the sub-clamping rods, the number of the clamps is at least 2, and each of the clamps is respectively fixedly mounted on the upper through groove and the lower through groove to cooperate in clamping and fixing the metal tree.

2. The plasma polishing fixture according to claim 1, characterized in that: The metal plate is a 304 stainless steel plate or a 316 stainless steel plate.

3. The plasma polishing fixture according to claim 1, characterized in that: The surfaces of the non-connecting parts of the clamping seat, the main clamping rod, the distribution plate, the sub-clamping rod and the clamper are all coated with insulating rubber.

4. The plasma polishing fixture according to claim 3, characterized in that: The insulating rubber is a polyurethane rubber.

5. The plasma polishing fixture according to claim 1, characterized in that: An end of the clamping seat close to the main clamping rod is provided with an assembly hole and a first fastening bolt. One end of the main clamping rod is inserted into the assembly hole and the main clamping rod is positioned by the first fastening bolt.

6. The plasma polishing fixture according to claim 5, characterized in that: The main clamping rod is arranged in a plate shape.

7. The plasma polishing fixture according to claim 1, characterized in that: The distribution plate is in a disc shape or a polygonal shape, and the distribution plate and the sub-clamping rod are fixed by a second fastening bolt.

8. The plasma polishing fixture according to claim 1, characterized in that: The upper through groove and the lower through groove are both in strip shape.

9. The plasma polishing fixture according to claim 1, characterized in that: The clamp includes a connecting rod, an elastic clip, a third fastening bolt and a fourth fastening bolt. The elastic clip is arranged at one end of the connecting rod, and the third fastening bolt and the fourth fastening bolt are arranged at the other end of the connecting rod. The elastic clip is made of a spring steel mesh. The other end of the connecting rod is provided with a thread. The third fastening bolt cooperates with the fourth fastening bolt to fix and clamp the opposite sides of the sub-clamping rod respectively.

10. The plasma polishing fixture according to claim 9, characterized in that: The elastic clip is arranged in a vertical cylindrical shape with a height of 5 to 10 mm and an inner diameter 1 to 2 mm smaller than the diameter of the metal trunk.

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