Car door external paint active spraying method

Abstract

The invention discloses a car door external paint active spraying method. The method comprises the following steps that a, a car door is placed in a hydrochloric acid pool for soaking, placed in a degreasing pool for soaking, placed in a phosphating pool for soaking, taken out immediately and placed in a passivation pool for soaking; b, a material cleaned and treated in the step a is subjected to drying treatment for 20-30 min, and then the car door is subjected to flame treatment or surface treatment of corona discharge active groups until the thickness of paint adsorbed by the car door reaches a preset range so that the surface adsorption ability of the car door can be improved; c, primer is sprayed on the car door; d, a blank subjected to primer spraying is subjected to heating draying treatment for 30-50 min, and then the dried blank is subjected to smoothing treatment; and e, middle coating paint is sprayed on the surface of the priming paint, the blank is dried for 0.5-1.5 h, and then polyurethane finishing varnish is continuously sprayed on the middle coating paint for three times. By the adoption of the car door external paint active spraying method, the mechanical performance of a surface coating of a car body is effectively improved.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a method for active spraying of car door exterior paint. Background technique [0002] The existing method for spraying the surface of the automobile door includes surface treatments such as grinding, static removal and dust removal on the surface of the automobile door, and steps such as spraying primer, scraping putty, scraping dust and spraying color paint to the automobile door. Among them, scraping putty and scraping dust is to remove the uneven part of the surface of the car door by filling or overall treatment after the primer is sprayed on the surface of the car door, so that the surface of the car door is smooth and smooth, so that the paint can be effectively attached to the car. The surface of the car door ensures the appearance quality of the car door surface. [0003] But also there is the following problem: scraping putty and scraping dust all need worker's manual putty ...

AI Technical Summary

Problems solved by technology

[0003] But also there is following problem: scraping putty and scraping dust all need worker's manual repeatedly putty or putty is coated on the automobile door surface, makes the step construction progress of scraping putty and scraping dust slow, causes the period of whole spraying operation to be longer, thereby The existing method of spraying the surface of automobile doors is only suitable for small-scale spraying treatment, and cannot meet the needs of the current large-scale production of automobiles