Double-color electrophoretic coating process for automobile hub

Abstract

The invention discloses a double-color electrophoretic coating process for an automobile hub. The double-color electrophoretic coating process comprises the following steps that pretreatment is conducted, and impurities on the surface of the hub are cleaned up and removed; oven pretreatment is carried out, and residual water stains on the surface of the pretreated hub are dried; room spraying bottom coating is performed, and a bottom coating film is formed on the surface of the hub; oven bottom coating is conducted, and melting, leveling and curing of the powder are carried out through high-temperature baking; spraying room colored painting is conducted, and a paint coating is sprayed onto the surface of the hub; oven colored painting is conducted, and leveling and curing of the colored paint are conducted through high-temperature baking; spraying room powder penetration is performed, and a penetration film is formed on the surface of the hub; oven powder setting is performed, and melting, leveling and curing of the powder are conducted through high-temperature baking; finish turning is conducted, and the surface coating is turned off through numerical control lathe finish machining; electrophoretic coating is conducted, and specifically, the hub is soaked in an electrophoresis tank to be subjected to electrophoretic coating; washing is conducted, and the residues on the surface of the hub are cleaned up after electrophoretic coating is completed; and drying is conducted, and a curing reaction is carried out on the electrophoretic paint through drying. In this way, the yield can be increased, and the corrosion resistance of an inner cavity, a welding seam and the edge of the hub can be remarkably improved.

Description

technical field [0001] The invention relates to the field of electrophoretic coating, in particular to a two-color electrophoretic coating process for automobile wheel hubs. Background technique [0002] At present, the aluminum alloy wheels on the market are all finished by machining after casting or forging, and the surface decoration is finished by painting and spraying. With the continuous development of social economy and science and technology, the production process mode is also gradually changing. The change of aesthetics and individual needs lead to more and more wheel shapes, and the requirements for surface decoration are also getting higher and higher. Many wheel hubs appear Two-color process. The main spraying method of the two-color process is to spray one color, cover it with a jig and then spray another color, using a high-pressure airless spraying process. The paint is pressurized by a high-pressure pump, and the compressed air is used as the power to make...

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Problems solved by technology

[0003] But at present, this method still has many defects: one is that on the flat surface of the spokes of the hub, the cover of the jig and the front of the spokes are completely overlapped, and the sprayed paint is easy to accumulate paint on the contact between the jig and the hub surface, resulting in paint. The layer is uneven, the appearance is poor, and the color is poor; the second is that on the uneven surface of the spokes of the hub, the cover of the jig and the front of the spokes cannot completely overlap, causing the paint to fly from the gap to other parts of the hub, which will cause lines at the boundary between the two paints Irregularity and incomplete patterns will seriously cause the wheel hub to be reworked again

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