Surface treatment method of piston inlaid ring

Abstract

The invention discloses a surface treatment method of a piston inlaid ring. The method comprises the steps that a sand-blasting machine is used to uniformly jet sand to the surface of the inlaid ring at a high speed, so that contaminants on the surface of the inlaid ring and in the inside deep grooves are completely removed until the surface of the inlaid ring is scrubbed and the roughness is uniform; and the working pressure of the sand-blasting machine ranges from 2 MPa to 10 MPa, sand blasting lasts for 2 min to 6 min, and the particle size of the sand ranges from 30 meshes to 320 meshes. Compared with the prior art, the piston inlaid ring is subjected to the sand-blasting treatment, on one hand, the corrosion on the surface of the inlaid ring can be removed, simultaneously the ring surface texture treated by the sand-blasting is meticulous compared with shot blasting treatment, so that the metallurgical bonding is facilitated, the bond quality of the ferro-aluminum combining area is improved, meanwhile the ultrasonic flaw detection is not affected, and the treatment cost is lower.

Description

technical field [0001] The invention relates to a surface treatment process for internal combustion engine accessories. Background technique [0002] As the heart of the internal combustion engine, the quality of the piston directly affects the thermal efficiency, mechanical efficiency, energy consumption and operational reliability of the internal combustion engine. In recent years, the working intensity of the piston will further increase, and the working environment will also deteriorate accordingly. The requirements for the material of the piston are also more stringent. It must have light weight, small thermal expansion coefficient, poor heat absorption, good thermal conductivity, and high temperature. It has the characteristics of high strength and wear resistance in the state. The current common practice is to inlay wear-resistant rings in the piston, that is, the piston body is made of eutectic aluminum-silicon alloy with light weight and good thermal conductivity; ...

AI Technical Summary

Problems solved by technology

Shot blasting has a good derusting effect, but this method is easy to blow out the graphite on the surface of the ring, and the fine graphite is easy to stick to the surface of the ring, forming the so-called non-wet pollution, which is difficult to remove, and graphite is serious Influencing the aluminizing of the wear ring and its bonding with the aluminum substrate

At the same time, this method creates pits on the surface of the ring, which is beneficial to the mechanical engagement of the wear ring and the aluminum substrate. Compared with molecular bonding, this mechanical engagement can ensure that the wear ring does not loosen on the piston, but because it is not molecular bonding , There must be a small gap between aluminum and iron, this gap seriously hinders the passage of heat flow, and the result may cause the piston head to overheat or even burn