Do you know what to do if the coated sand is not glossiness enough?

Coated sand mainly uses high-quality selected natural quartz sand as raw sand, thermoplastic phenolic resin, urotropine and reinforcing agent as raw materials, according to the different technical needs of users, in the curing speed, stripping, fluidity, collapsibility, casting surface finish, storage and other aspects of the appropriate adjustment ratio. The following is about the reasons and solutions for the insufficient gloss of coated sand.

1 Coated sand has poor high temperature resistance, and some high temperature resistant additives can be added. This additive can be sintered at high temperature to make the casting smooth.

2 The design of the shelling mold is unreasonable, and the temperature of the core box is uneven, which makes the strength of the low temperature part low and shelling; the melting point of the coated sand is low, the curing speed is slow, and the thermal strength is low. Improve the mold structure, so that the temperature distribution is uniform; choose high melting point, fast curing speed, high thermal strength of the resin.

Type 3 (core) surface is loose: the core injection pressure is too high or too low; The mold exhaust is not smooth; The mold runs sand due to the large gap between the box surfaces. Coated sand has poor fluidity or poor air permeability. Choose reasonable sand injection pressure to improve the exhaust system and prevent suffocation; use materials with small deformation as core boxes; choose coated sand with good fluidity and air permeability.

In fact, China's coated sand technology began in the mid-1950s and was once discontinued in the 1960 s. In the 1980 s, due to the rapid development of the automobile industry and the export of mechanical products, higher requirements were put forward for the quality of castings, thus promoting the rapid development of coated sand production and application technology. By the 21st century, the annual production and sales volume of China's coated sand industry has reached more than 900000 tons, which is widely used in the production of automobile cylinder blocks, cylinder heads, intake manifolds, various pipe fittings, pump bodies and other complex castings.

This article is finished by coated sand, the point of view of this article does not represent the point of view of this site.