An improved CVD coating fixture

Abstract

The utility model discloses an improved structure's CVD coating clamp, including clamp body, the middle part slidingly connected with the positioning strip of clamp body, the both ends of positioning strip all are established V type limit slot, the both sides of positioning strip top all are established movable slot, the inside of two movable slots all are rotatably connected with the screw rod, the surface of two screw rods all are threadedly connected with the movable block of movable slot slidingly connected, wherein the top of two movable blocks all are fixedly installed with first fixed component, the top of another two movable blocks all are fixedly installed with second fixed component, the utility model discloses an improved structure's CVD coating clamp, this clamp provides a kind of high-temperature stable quick-mounting and quick-dismounting structure clamp, realizes material tray zero damage, is hung and fixed on material tray by first fixed component, second fixed component and V type limit slot, sets up suspension formula layout, improves furnace loading, utilizes ball mill rod, aluminium oxide particle collocation and ethanol collocation ball mill to realize quick recoating, and practicality is high.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, specifically to an improved CVD coating fixture. Background Technology

[0002] The aircraft-type conical fixture design optimizes material utilization by reducing material waste through changes in the shape of forgings. This is particularly evident in conical sleeve forgings, where the fixture design significantly improves material utilization. The aircraft-type conical fixture ensures stable clamping of large workpieces by compensating for thermal symmetry and center distance errors, guaranteeing the stability and accuracy of the workpiece during clamping. The aircraft-type conical fixture design provides high clamping force, ensuring the stability and accuracy of the workpiece during machining and avoiding machining errors caused by insecure clamping.

[0003] However, traditional coating fixtures have the following drawbacks: After multiple coating depositions, the cumulative surface coating thickness of the fixture can reach 0.2-0.5mm, increasing the contact area between the fixture and the workpiece by 30%-50%. However, extremely high mechanical force is required during disassembly, which can easily cause scratches on the workpiece surface. Because the clamp and the tray are rigidly connected, forced disassembly can easily deform the tray positioning hole and damage the graphite tray, resulting in excessive cost per operation and the risk of damage to the tray. The existing fixture has a smooth surface with Ra < 0.2 μm, and the coating has too strong an adhesion, making it difficult to completely remove by conventional sandblasting or acid washing. Furthermore, sandblasting can easily cause the fixture to deform and become unusable, posing a risk of low coating peeling efficiency. Utility Model Content

[0004] The purpose of this invention is to provide an improved CVD coating fixture to address the problems mentioned in the background art. These problems include: after multiple coating depositions, the cumulative surface coating thickness of the fixture can reach 0.2-0.5 mm, increasing the contact area between the fixture and the workpiece by 30%-50%. This requires extremely high mechanical force during disassembly, easily causing scratches on the workpiece surface; because the fixture and the tray are rigidly connected, forced disassembly can easily deform the tray positioning holes and damage the graphite tray, resulting in excessively high costs and the risk of damage to the tray; and existing fixtures have a smooth surface with Ra < 0.2 μm, resulting in excessively strong coating adhesion, making it difficult to completely remove the coating through conventional sandblasting or acid pickling. Furthermore, sandblasting can easily deform the fixture, making it difficult to reuse and posing a risk of low coating peeling efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an improved CVD coating fixture, comprising a fixture body, a positioning strip slidably connected to the middle of the fixture body, V-shaped limiting grooves being formed at both ends of the positioning strip, and movable grooves being formed on both sides of the top of the positioning strip, with lead screws rotatably connected inside the two movable grooves, and movable blocks slidably connected to the surfaces of the two lead screws, wherein a first fixing component is fixedly installed at the top of the two movable blocks, and a second fixing component is fixedly installed at the top of the other two movable blocks, each of the two first fixing components comprising a height shell and a height plate, the top of the height shell being slidably connected to the bottom of the height plate, and the top of one side of the height plate being fixedly connected to one end of the first fixing plate, each of the two second fixing components comprising a vertical plate and a second fixing plate, a lifting groove being formed on one side of the vertical plate, a lifting block being slidably connected inside the lifting groove, and one end of the lifting block being fixedly connected to one end of the second fixing plate.

[0006] Preferably, the clamp body includes an outer shell, a connecting shell, and an inner shell, wherein the outer side of the inner shell is fixedly connected to the inner side of the connecting shell, and the outer side of the connecting shell is fixedly connected to the inner side of the outer shell.

[0007] Preferably, the outer shell is made of aluminum oxide, the connecting shell is made of anhydrous ethanol film material, and the inner shell is made of aluminum.

[0008] Preferably, the surface of the height shell is threaded with a fixing screw, and the height shell is fixedly connected to the height plate by the fixing screw. The bottom ends of the two height shells are respectively fixedly connected to two movable blocks. The user slides the height plate along the height shell to adjust the height of the first fixed plate. Then the user tightens the fixing screw, and the thread on the surface of the fixing screw matches the thread on the inner wall of the height shell to fix the height plate and the height shell together.

[0009] Preferably, the surface of the upright plate is threaded with positioning screws, and the upright plate is fixedly connected to the lifting block by the positioning screws. The bottom ends of the two upright plates are respectively fixedly connected to two other movable blocks. The user slides the lifting groove along the lifting block to adjust the height of the second fixed plate. Then the user screws the positioning screws, and the threads on the surface of the positioning screws match the threads on the inner wall of the upright plate to fix the second fixed plate on the upright plate.

[0010] Preferably, one end of each of the two lead screws is fixedly equipped with a handle extending to the outside. When the user turns the handle, the handle drives the lead screw to rotate. The thread on the surface of the lead screw matches the thread on the inner wall of the movable block. The movable block is limited by the movable groove that matches its shape and size. Therefore, the movable block slides along the lead screw to adjust the position of the fixed component.

[0011] Preferably, a first magnetic strip is fixedly installed at the connection between the clamp body and the positioning strip, and a second magnetic strip is fixedly installed at the middle of the top of the positioning strip. The first magnetic strip and the second magnetic strip are magnetically connected, and the clamp body is magnetically installed on the positioning strip through the first magnetic strip and the second magnetic strip.

[0012] Compared with the prior art, the beneficial effects of this utility model are: the fixture provides a high-temperature stable quick loading and unloading structure fixture, achieving zero damage to the material tray. It is suspended and fixed on the material tray by the first fixing component, the second fixing component and the V-shaped limiting groove, setting a suspended layout to increase the furnace loading capacity. It uses a ball milling machine with a combination of ball milling rods, alumina particles and ethanol to achieve rapid coating removal, which is highly practical. Attached Figure Description

[0013] Figure 1 This is a side view of the present invention; Figure 2 This is a partial schematic diagram of the positioning strip of this utility model; Figure 3 This is a perspective view of the second fixing component of this utility model; Figure 4 This is a schematic diagram of the structure of the fixture body of this utility model.

[0014] In the diagram: 1. Fixture body; 101. Outer shell; 102. Connecting shell; 103. Inner shell; 2. Positioning strip; 3. First fixing component; 31. Height shell; 32. Height plate; 33. First fixing plate; 34. Fixing screw; 4. Second fixing component; 41. Vertical plate; 42. Lifting groove; 43. Lifting block; 44. Second fixing plate; 45. Positioning screw; 5. First magnetic strip; 6. Second magnetic strip; 7. Movable groove; 8. Handle; 9. Lead screw; 10. V-shaped limit groove; 11. Movable block. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0016] Please see Figures 1-4This utility model provides an improved CVD coating fixture, including a fixture body 1. A positioning strip 2 is slidably connected to the middle of the fixture body 1. V-shaped limiting grooves 10 are provided at both ends of the positioning strip 2. Movable grooves 7 are provided on both sides of the top of the positioning strip 2. A lead screw 9 is rotatably connected inside the two movable grooves 7. Movable blocks 11 that are slidably connected to the movable grooves 7 are threaded to the surfaces of the two lead screws 9. A first fixing component 3 is fixedly installed at the top of the two movable blocks 11. A second fixing component 4 is fixedly installed at the top of the other two movable blocks 11. Each of the two first fixing components 3 includes a height shell 31 and a height plate 32. The top of the height shell 31 is slidably connected to the bottom of the height plate 32. The top of one side of the height plate 32 is fixedly connected to one end of the first fixing plate 33. Each of the two second fixing components 4 includes a vertical plate 41 and a second fixing plate 44. A lifting groove 42 is provided on one side of the vertical plate 41. A lifting block 43 is slidably connected inside the lifting groove 42. One end of the lifting block 43 is fixedly connected to one end of the second fixing plate 44.

[0017] The fixture body 1 includes an outer shell 101, a connecting shell 102, and an inner shell 103. The outer side of the inner shell 103 is fixedly connected to the inner side of the connecting shell 102, and the outer side of the connecting shell 102 is fixedly connected to the inner side of the outer shell 101.

[0018] The outer shell 101 is made of aluminum oxide, the connecting shell 102 is made of anhydrous ethanol film, and the inner shell 103 is made of aluminum.

[0019] The surface of the height shell 31 is threaded with a fixing screw 34. The height shell 31 is fixedly connected to the height plate 32 by the fixing screw 34. The bottom ends of the two height shells 31 are fixedly connected to two movable blocks 11 respectively. The user slides the height plate 32 along the height shell 31 to adjust the height of the first fixing plate 33. Then the user tightens the fixing screw 34. The thread on the surface of the fixing screw 34 matches the thread on the inner wall of the height shell 31, fixing the height plate 32 and the height shell 31 together.

[0020] The surface of the upright plate 41 is threaded with positioning screws 45. The upright plate 41 is fixedly connected to the lifting block 43 by positioning screws 45. The bottom ends of the two upright plates 41 are fixedly connected to two other movable blocks 11 respectively. The user slides the lifting groove 42 along the lifting block 43 to adjust the height of the second fixed plate 44. Then the user screws the positioning screws 45. The threads on the surface of the positioning screws 45 match the threads on the inner wall of the upright plate 41 to fix the second fixed plate 44 on the upright plate 41.

[0021] One end of each of the two lead screws 9 is fixedly equipped with a handle 8 extending to the outside. When the user turns the handle 8, the handle 8 drives the lead screw 9 to rotate. The thread on the surface of the lead screw 9 matches the thread on the inner wall of the movable block 11. The movable block 11 is limited by the movable groove 7 that matches its shape and size. Therefore, the movable block 11 slides along the lead screw 9 to adjust the position of the fixed component.

[0022] A first magnetic strip 5 is fixedly installed at the connection between the clamp body 1 and the positioning strip 2, and a second magnetic strip 6 is fixedly installed at the middle of the top of the positioning strip 2. The first magnetic strip 5 and the second magnetic strip 6 are magnetically connected, and the clamp body 1 is magnetically mounted on the positioning strip 2 through the first magnetic strip 5 and the second magnetic strip 6.

[0023] In this embodiment, during use: the user rotates the handle 8, which drives the lead screw 9 to rotate. The thread on the surface of the lead screw 9 matches the thread on the inner wall of the movable block 11. The movable block 11 is limited by the movable groove 7, which matches its shape and size. Therefore, the movable block 11 slides along the lead screw 9 to adjust the position of the fixing component. The user slides the lifting groove 42 along the lifting block 43 to adjust the height of the second fixing plate 44. Then, the user tightens the positioning screw 45. The thread on the surface of the positioning screw 45 matches the thread on the inner wall of the upright plate 41, fixing the second fixing plate 44 onto the upright plate 41. The user slides the height plate 32 along the height housing 31 to adjust the height of the first fixing plate 33. Then, the user tightens the fixing screw 34, whose thread matches the thread on the inner wall of the height housing 31, fixing the height plate 32 to the height housing 31. The user then slides the lifting groove 42 along the lifting block 43 to adjust the height of the second fixing plate 44. Then, the user tightens the positioning screw 45, whose thread matches the thread on the inner wall of the upright plate 41, fixing the second fixing plate 44 to the upright plate 41. The first fixing plate 33 and the second fixing plate 44 are then adjusted. 4. The fixtures work together to fix the clamps onto the material tray. The V-shaped limiting groove 10 at the top of the column and the 3° taper enable quick loading and unloading and reduce the direct contact area with the material tray, minimizing damage. The fixture body 1 is made of molybdenum alloy or hard alloy, with a high temperature resistance of ≥1300℃. The length of the column changes with the product thickness, and the diameter of the column is determined by the weight and aperture of the product. V-shaped limiting grooves are provided at both ends of the column, and the top has a 0.8mm taper angle of 3°. Ball milling is used with a ball milling rod or aluminum oxide particles and ethanol to remove the coating. After the product is screened, it is cleaned again by ball milling with ethanol. The fixtures are then... Transfer the material to a grinding jar, fill it with anhydrous ethanol to 60%-70% of its volume, and add zirconia grinding balls at a ball-to-material ratio of 5:1, matching the fixture size. Start the ball mill, control the speed at 200-250 rpm, and process for 10-20 minutes. The coating is peeled off through the collision of the grinding balls and the lubrication of the alcohol. Remove the grinding media and product from the grinding jar, and put the peeled product back into the grinding jar. Fill the jar with anhydrous ethanol to 60%-80% of its volume, restart the ball mill, control the speed at 200-250 rpm, and process for about 10 minutes to achieve a secondary coating treatment and cleaning effect.

[0024] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An improved CVD coating fixture, comprising a fixture body (1), characterized in that: A positioning strip (2) is slidably connected to the middle of the fixture body (1). V-shaped limiting grooves (10) are provided at both ends of the positioning strip (2). Movable grooves (7) are provided on both sides of the top of the positioning strip (2). A lead screw (9) is rotatably connected inside each of the two movable grooves (7). Movable blocks (11) that are slidably connected to the movable grooves (7) are threaded onto the surfaces of the two lead screws (9). A first fixing component (3) is fixedly installed at the top of each of the two movable blocks (11), and a second fixing component (4) is fixedly installed at the top of the other two movable blocks (11). Each of the first fixing components (3) includes a height shell (31) and a height plate (32). The top end of the height shell (31) is slidably connected to the bottom end of the height plate (32). The top end of one side of the height plate (32) is fixedly connected to one end of the first fixing plate (33). Each of the two second fixing components (4) includes a vertical plate (41) and a second fixing plate (44). A lifting groove (42) is provided on one side of the vertical plate (41). A lifting block (43) is slidably connected inside the lifting groove (42). One end of the lifting block (43) is fixedly connected to one end of the second fixing plate (44).

2. The CVD coating fixture with an improved structure according to claim 1, characterized in that: The clamp body (1) includes an outer shell (101), a connecting shell (102) and an inner shell (103). The outer side of the inner shell (103) is fixedly connected to the inner side of the connecting shell (102), and the outer side of the connecting shell (102) is fixedly connected to the inner side of the outer shell (101).

3. The CVD coating fixture with an improved structure according to claim 2, characterized in that: The outer shell (101) is made of aluminum oxide, the connecting shell (102) is made of anhydrous ethanol film, and the inner shell (103) is made of aluminum.

4. The CVD coating fixture with an improved structure according to claim 1, characterized in that: The surface of the height shell (31) is threaded with a fixing screw (34), and the height shell (31) is fixedly connected to the height plate (32) by the fixing screw (34). The bottom ends of the two height shells (31) are respectively fixedly connected to two movable blocks (11).

5. The CVD coating fixture with an improved structure according to claim 1, characterized in that: The surface of the upright plate (41) is threaded with positioning screws (45), and the upright plate (41) is fixedly connected to the lifting block (43) by the positioning screws (45). The bottom ends of the two upright plates (41) are respectively fixedly connected to two other movable blocks (11).

6. The CVD coating fixture with an improved structure according to claim 1, characterized in that: Each of the two lead screws (9) has a handle (8) that extends to the outside fixedly installed at one end.

7. The CVD coating fixture with an improved structure according to claim 1, characterized in that: A first magnetic strip (5) is fixedly installed at the connection between the clamp body (1) and the positioning strip (2), and a second magnetic strip (6) is fixedly installed at the middle of the top of the positioning strip (2). The first magnetic strip (5) and the second magnetic strip (6) are magnetically connected.

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