Analysis of the process and function of surface electroplating of automobile stamping parts
Reasons for the loss of stamping dies
- (1) The material of the main working parts of the mold is improperly selected. The material has poor performance and is not wear-resistant; the die steel is not refined and has a large number of smelting defects; the convex and concave die, the forging process of the forging blank is not perfect, and there are hidden heat treatment risks.
- (2) The mold structure design problem, the die structure is unreasonable. The slender punch is not designed with a reinforcement device, the discharge port is not smooth, and the stacking occurs.
- (3) The molding process is not perfect, which is mainly manifested in the poor internal quality of the convex and concave die forging blanks, and the problems with the heat treatment technology and process, which cause the convex and concave dies to be hardened, soft spots and uneven hardness. Sometimes micro-cracks or even cracking occur, grinding and polishing are not in place, and the surface roughness value is too large.
- (4) Unlubricated or lubricated but ineffective.
The surface treatment processes of automobile stamping parts are: gold plating, silver plating, nickel plating, and zinc plating.
Gold plating: The gold plating on the surface of the workpiece is not only beautiful, but also not easy to oxidize, but the cost is higher.
Silver plating: A layer of silver is plated on the surface treatment, the contact resistance is less, and the conductivity is better, and it is not easy to oxidize.
Nickel plating: Nickel plating is a common treatment method for surface treatment of automotive stampings. Its function is to facilitate the welding of products, not easy to oxidize, and to have good electrical conductivity.
Galvanized: beautiful, anti-rust, improve its protective and decorative effects.
The role of surface treatment in the production of automotive stampings is: oxidation resistance, easier electrical conductivity, rust prevention, decoration, and improved product performance.
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