Modification treatment method for surface of automobile die through thermal spraying

Abstract

The invention discloses a modification treatment method for the surface of an automobile die through thermal spraying. The method comprises the following steps: firstly, carrying out flaw detection, baking and wiping pretreatment on the surface of the automobile die, and protecting the non-sprayed surface of the automobile die by using a tooling; carrying out roughening treatment on the surface to be sprayed of the automobile die through sandblasting, so that the homogeneous metal natural-color is exposed, and the surface roughness is controlled at Ra 6-8 mu m; preparing a metal ceramic coating on the surface to be sprayed by using a thermal spraying process, wherein the spraying is implemented in a robot programming automated spraying and manual spraying combined mode; and polishing the sprayed area by using a polishing and grinding disc, so that the thickness of a final thermal-sprayed coating is controlled at 0.06-0.10 mm, and the roughness Ra is less than 0.8 mu m. The method overcomes defects existing in traditional die surface treatment methods, the comprehensive performances such as hardness, wear resistance, corrosion resistance and the like of the surface of the automobile die treated by using the method are excellent, the service life of the die is effectively prolonged, the die repair frequency is reduced, and the production cost is lowered.

Description

technical field [0001] The invention relates to a thermal spraying modification treatment method for the surface of an automobile mold. Background technique [0002] With the rapid development of the automobile industry, the requirements for the precision and life of automobile molds are getting higher and higher. The demand for research and development of new models continues to increase. For each new model developed, about 80% of the molds need to be newly developed. About 60% of the new model development costs are used for the development of the body and stamping process and equipment. Among them, the production process requirements and high technical content of automobile molds lead to high production costs, so the automobile molds are required to have the highest possible service life. After the automobile mold without surface treatment is put into production, the surface of the mold is easily scratched, and the mold needs to be repaired repeatedly, which not only incr...

AI Technical Summary

Problems solved by technology

Quenching and nitriding process as a traditional surface treatment, although the cost is low, can improve the wear resistance of the mold to a certain extent, but the material requirements are high, and it is easy to cause thermal deformation; the electroplating treatment method has better wear resistance, and the coating is relatively Uniform, but the construction is complicated, it is not easy to repair the mold, and the electroplating of chromium will cause environmental pollution; TD treatment is a carbide coating treatment by thermal diffusion method, which is a kind of metal that forms a layer of several microns to tens of microns on the surface of the workpiece through high temperature diffusion. Carbide coating, the coating has extremely high hardness and is metallurgically combined with the parent material. After TD treatment, the mold surface has high hardness and good wear resistance, but it has high requirements for mold design and mold material, high processing costs, and Easy to cause thermal deformation, not easy to repair the mold