SMC workpiece surface treatment method and application thereof

Abstract

The invention provides an SMC workpiece surface treatment method and a method for correcting the surface difference of a vehicle bumper by applying the method. The SMC workpiece surface treatment method comprises the following steps: carrying out a pretreatment process including a first polishing process on the surface of an SMC workpiece; carrying out a primer spraying process on the surface of the SMC workpiece after the pretreatment process; carrying out an intermediate treatment process on the surface of the SMC product after the primer spraying process, wherein the intermediate treatmentprocess comprises a putty scraping process and a floating coat spraying process which are carried out in sequence; and performing a post-treatment process including a second polishing process on the surface of the SMC product after the intermediate treatment process. According to the method, an atomic ash scraping process is adopted to replace a glass fiber reinforced plastic pasting process in the prior art; and intermediate paint is adopted to replace resin in the prior art to serve as an intermediate connecting medium, the complexity of the whole technological process is reduced, the surface treatment quality can be improved while accurate correction of the surface of the SMC workpiece is achieved, and the adhesive force of a surface coating of the SMC workpiece is remarkably improved.

Description

technical field [0001] The invention relates to the field of surface treatment, in particular to a method for surface treatment of SMC parts and a method for correcting the surface difference of a vehicle bumper by applying the method. Background technique [0002] SMC (Sheet molding compound) composite materials are often used to make machine parts, vehicles, ships, etc. because of their excellent electrical insulation properties, mechanical properties, thermal stability and chemical corrosion resistance. For vehicles, SMC composite materials are currently mainly used to make body, bumper, interior products, etc. After the bumper is installed, there are usually parts that match the surrounding parts due to various reasons such as structural design and assembly operation. Face difference phenomenon. The existing surface correction process generally adopts: grinding, resin brushing, puttying, secondary puttying, grinding, pasting of glass fiber felt and multiple grindings af...

AI Technical Summary

Problems solved by technology

For vehicles, SMC composite materials are currently mainly used to make body, bumper, interior products, etc. After the bumper is installed, there are usually parts that match the surrounding parts due to various reasons such as structural design and assembly operation. Face difference

The existing surface correction process generally adopts: grinding, resin brushing, puttying, secondary puttying, grinding, pasting of glass fiber felt and multiple grindings after curing; the whole correction process is cumbersome and requires a , environmental requirements, and operational requirements are high. Taking grinding as an example, the bumper (specifically, SMC parts) needs to be fully polished many times by using the existing surface difference correction process, but it is limited by the characteristics of the SMC parts itself, that is, : The molecular structure is tight, the surface has no micropores, and the bumper body after multiple times of full polishing still cannot meet the surface roughness requirements of hand-laid FRP, and it is difficult to form an effective bond between the paper glass fiber mat and the bumper body , there are often pasting defects and insufficient adhesion after pasting, which lead to cracking and falling off of FRP, and the defect rate is as high as 30%, which seriously affects the appearance quality and processing cost

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