Automobile hub surface treatment process

Abstract

The invention relates to the technical field of automobiles, in particular to an automobile hub surface treatment process. The automobile hub surface treatment process comprises the following steps that first step of first-time hot water washing, the second step of oil removing treatment, the third step of cleaning and drying, the fourth step of chromate-free passivation treatment, the fifth step of bottom powder spraying and curing, the sixth step of machining treatment, the seventh step of second-time paint spraying, the eighth step of vacuum plating, and the ninth step of transparent coating spraying. According to the hub coating powder spraying paint spraying technology, the performance of a hub can be improved, the technology is simple, and the coating effect is good. By means of medium powder spraying and curing, the flatness, the glassines, the hardness and the corrosion resistance of the surface of the hub are improved, the surface of the hub is sealed, and the bonding force of a vacuum coating is improved. Through the transparent coating and high attaching force of the vacuum coating, the glossiness, the hardness, the abrasion resistance and the corrosion resistance of the hub are improved. The automobile hub surface treatment process is simple and low in energy consumption. The hardness and the corrosion resistance of the manufactured hub are high.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to an automobile wheel hub surface treatment process. Background technique [0002] In the production process of automobile aluminum alloy wheels, after the wheel hub turning process is completed, it is necessary to clean the emulsion, oil stains, aluminum chips and other impurities on the surface of the hub workpiece, and ensure that the surface of the hub is dry before transferring to the next step. In the past, the water nozzle was directly installed in the front section of the wheel hub conveying line, spraying cold or hot water to clean the wheel hub, and then a high-power heater and a large blower were installed in the rear section of the wheel hub conveying line to dry the wheel hub . The existing cleaning process is complicated, the cleaning effect is poor, and it cannot meet the production requirements of the wheel hub. [0003] Aluminum alloy wheels are mainly formed...

AI Technical Summary

Problems solved by technology

The water electroplated wheel hub has good surface quality such as high brightness and wear resistance, but there are many problems in the production process: (1) After the aluminum alloy wheel hub is formed, the surface is rough. Very meticulous polishing is required. Due to the complex wheel shape, this process is time-consuming, high cost, poor working conditions, and low blank utilization rate; (2) Aluminum alloys are hard-to-plate metals, and the pre-plating pretreatment is strict and the operation is complicated; (3) ) A large amount of water resources are consumed in the electroplating production process to produce a large amount of waste water and waste gas; (4) zinc-copper-nickel is used as the bottom coating and chromium is used as the surface coating at the bottom of the coating, which consumes a large amount of precious metals and produces a large amount of heavy metal wastewater; The degree of destruction is large, and the treatment of the three wastes of electroplating (waste water, waste gas, waste residue) is difficult, costly and cannot be completely cured. This is an international problem. Many electroplating factories in developed countries have been transferred to developing countries. China's environmental aspects The requirements are getting higher and higher, and many big cities have replaced water electroplating with vacuum coating

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