Jig for improving film thickness uniformity

Abstract

The utility model discloses a jig for improving film thickness uniformity, which comprises a hanging frame and a workpiece to be coated, the workpiece to be coated is hung on the hanging frame, metal strips capable of being coated are arranged on four sides of the workpiece on the hanging frame and are used for expanding a coating area of the workpiece, and the distance between the metal strip on each side and the edge of the workpiece is adjustable. According to the utility model, on the basis that the production scale and the production efficiency are not influenced, the film thickness difference between the middle area and the peripheral area of the workpiece can be reduced, so that the film thickness uniformity of the workpiece can be effectively improved, and the product quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of aluminum alloy workpiece coating technology, specifically a fixture for improving the uniformity of film thickness. Background Technology

[0002] Currently, in order to improve the service life of aluminum alloy workpieces, it is usually necessary to perform hard anodizing treatment, that is, to perform coating treatment, to form a hard and corrosion-resistant oxide film on the surface of the aluminum alloy workpiece.

[0003] To expand production scale and improve production efficiency, the volume of the coating tank is usually designed to be large enough. However, this makes it more difficult to control the uniformity of the film thickness on the workpiece. The reason is that there are temperature differences in the upper, lower, left, right and middle parts of the workpiece in the large-volume coating tank. In addition, due to the difference in the area of ​​the cathode plate, the film thickness difference in different areas of the workpiece will be too large. That is, there is a difference in film thickness between the middle area of ​​the workpiece and the surrounding area. This difference in film thickness can be more than 10μm, which has a significant impact on the uniformity of film thickness on the workpiece. Utility Model Content

[0004] The purpose of this invention is to overcome the defects and deficiencies of the existing technology and provide a fixture for improving film thickness uniformity. Without affecting the improvement of production scale and efficiency, it can reduce the film thickness difference between the central area and the surrounding area of ​​the workpiece, thereby improving the film thickness uniformity problem and improving product quality.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A fixture for improving film thickness uniformity includes a hanger and a workpiece to be coated mounted on the hanger, characterized in that: a coating-compatible metal strip is installed on all four sides of the workpiece on the hanger to expand the coating area of ​​the workpiece, and the distance between the metal strip on each side and the edge of the workpiece is adjustable.

[0007] Furthermore, the bracket includes a horizontal beam and two vertical beams, which are arranged symmetrically from left to right, and the upper ends of the two vertical beams are fixedly connected to the front side of the horizontal beam. Positioning pins are fixedly connected to the upper and lower sides of the front side of each vertical beam.

[0008] Furthermore, each of the four corners of the workpiece is provided with a positioning through hole, which is tightly fitted onto the corresponding positioning pin, for hanging the workpiece on the front side of the two vertical beams.

[0009] Furthermore, the crossbeam is provided with transverse strip grooves on the outer sides of both vertical beams.

[0010] Furthermore, the metal strip includes two vertical aluminum strips and two horizontal aluminum strips. The upper ends of the two vertical aluminum strips and the two ends of the two horizontal aluminum strips are provided with through holes. The upper parts of the two vertical beams and the lower parts of the two vertical aluminum strips are provided with vertical strip-shaped through grooves. A screw passes through the through holes and the corresponding horizontal strip-shaped through grooves and vertical strip-shaped through grooves respectively. Locking nuts are screwed onto both ends of the screw.

[0011] Furthermore, both ends of the crossbeam are fixedly connected to hangers.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This invention, without affecting production scale and efficiency, sets metal strips around the workpiece to be coated, and the distance between each metal strip and the edge of the workpiece is adjustable, thereby expanding the coating area of ​​the workpiece. This allows each metal strip to participate in the coating (oxidation) process of the workpiece, resulting in a difference in film thickness between the workpiece in the central area and the surrounding metal strips. This reduces the film thickness difference between the central and surrounding areas of the workpiece, effectively improving the uniformity of film thickness and enhancing product quality. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 for Figure 1 Enlarged structural diagram of part A.

[0016] Figure 3 for Figure 1 Enlarged structural diagram of section B. Detailed Implementation

[0017] 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.

[0018] See Figure 1-3 A fixture for improving film thickness uniformity includes a hanger and a workpiece 1 to be coated, which is mounted on the hanger. Coated metal strips 2 are installed on all four sides of the workpiece on the hanger to expand the coating area of ​​the workpiece 1. The distance between the metal strip 2 on each side and the edge of the workpiece 1 is adjustable.

[0019] In this utility model, the bracket includes a horizontal beam 3 and two vertical beams 4. The two vertical beams 3 are arranged symmetrically from left to right, and the upper ends of the two vertical beams 3 are fixedly connected to the front side of the horizontal beam 3. The upper and lower sides of the front side of each vertical beam 3 are fixedly connected to positioning pins 4.

[0020] In this utility model, each of the four corners of the workpiece 1 is provided with a positioning through hole, which is tightly fitted onto the corresponding positioning pin 4, so as to hang the workpiece 1 on the front side of the two vertical beams 3, that is, to hang the workpiece 1 to be coated on the hanger.

[0021] In this utility model, the crossbeam 3 is provided with transverse strip grooves 5 on the outer sides of the two vertical beams 4.

[0022] In this utility model, the metal strip 2 includes two vertical aluminum strips and two horizontal aluminum strips. The upper ends of the two vertical aluminum strips 2 and the two ends of the two horizontal aluminum strips 2 are provided with through holes. The upper parts of the two vertical beams 3 and the lower parts of the two vertical aluminum strips 2 are provided with vertical strip-shaped through grooves 6. Screws 7 pass through the through holes and the corresponding horizontal strip-shaped through grooves 5 and vertical strip-shaped through grooves 6 respectively. Locking nuts 8 are screwed into the two ends of the screws 7 respectively.

[0023] Therefore, by tightening the locking nuts 8, the locking nuts 8 at both ends respectively abut against the front sides of each vertical aluminum strip 2 and each horizontal aluminum strip 2, as well as the rear sides of the crossbeam 3, each vertical beam 4, and each vertical aluminum strip 2, thereby fixing the two vertical aluminum strips 2 and the two horizontal aluminum strips 3 around the workpiece 1.

[0024] In this utility model, both ends of the crossbeam are fixedly connected with lifting rods 9, so as to lift the hanger, workpiece 1, two vertical aluminum strips 2 and two horizontal aluminum strips 3 into the coating tank.

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] Before coating, the positioning through hole is tightly fitted onto the corresponding positioning pin 4, so that the workpiece 1 to be coated is hung on the front side of the two vertical beams 3, that is, the workpiece 1 to be coated is hung on the hanger.

[0027] Next, based on a reasonable spacing, determine the positions of the two vertical aluminum strips 2 and the two horizontal aluminum strips 3 relative to the workpiece 1.

[0028] Then, insert the screw 7 and tighten the locking nut 8 so that the locking nuts 8 at both ends respectively abut against the front side of each vertical aluminum strip 2 and each horizontal aluminum strip 2, as well as the rear side of the crossbeam 3, each vertical beam 4 and each vertical aluminum strip 2, thereby fixing the two vertical aluminum strips 2 and the two horizontal aluminum strips 3 around the workpiece 1.

[0029] During the coating process, the hanger, workpiece 1, two vertical aluminum strips 2 and two horizontal aluminum strips 3 are hoisted into the coating tank.

[0030] During the coating process, since each aluminum strip 2 participates in the coating (oxidation) process of the workpiece 1, the overall thickness of the workpiece 1 located in the central area differs from that of the aluminum strips 2 around it. This reduces the thickness difference between the central area and the surrounding area of ​​the workpiece 1. After coating, the thickness of the oxide film formed on the surface of the workpiece 1 is 51-60μm, which can control the thickness difference within 10μm. Therefore, it can effectively improve the uniformity of the film thickness of the workpiece 1 and improve product quality.

[0031] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0032] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A fixture for improving film thickness uniformity, comprising a hanger and a workpiece to be coated mounted on the hanger, characterized in that: The hanger has metal strips that can be coated on all four sides of the workpiece to expand the coating area of ​​the workpiece. The distance between the metal strips on each side and the edge of the workpiece is adjustable.

2. The fixture for improving film thickness uniformity according to claim 1, characterized in that: The bracket includes a horizontal beam and two vertical beams. The two vertical beams are arranged symmetrically from left to right, and the upper ends of the two vertical beams are fixedly connected to the front side of the horizontal beam. Positioning pins are fixedly connected to the upper and lower sides of the front side of each vertical beam.

3. The fixture for improving film thickness uniformity according to claim 2, characterized in that: The workpiece is provided with positioning through holes at each of its four corners. The positioning through holes are tightly fitted onto the corresponding positioning pins, and are used to hang the workpiece on the front side of the two vertical beams.

4. A fixture for improving film thickness uniformity according to claim 2, characterized in that: The crossbeam is provided with transverse strip grooves on the outer side of both vertical beams.

5. A fixture for improving film thickness uniformity according to claim 4, characterized in that: The metal strip includes two vertical aluminum strips and two horizontal aluminum strips. The upper ends of the two vertical aluminum strips and the two ends of the two horizontal aluminum strips are provided with through holes. The upper part of the two vertical beams and the lower part of the two vertical aluminum strips are provided with vertical strip-shaped through grooves. A screw passes through the through holes and the corresponding horizontal strip-shaped through grooves and vertical strip-shaped through grooves respectively. Locking nuts are screwed into the two ends of the screw respectively.

6. A fixture for improving film thickness uniformity according to claim 2, characterized in that: Both ends of the crossbeam are fixedly connected to hangers.

Images