Composite molding process of alkaline phenol formaldehyde resin facing sand and ester-hardened sodium silicate backing sand

Abstract

The invention relates to the technical field of a casting process, in particular to a composite molding process of alkaline phenol formaldehyde resin facing sand and ester-hardened sodium silicate backing sand, and solves the problems of high cost, low quality, difficult environmental protection and the like caused by defects in the molding process of the alkaline phenol formaldehyde resin sand and ester-hardened sodium silicate sand. According to different chemical curing reflection mechanisms of the alkaline phenol formaldehyde resin sand and the ester-hardened sodium silicate sand, the formula of the alkaline phenol formaldehyde resin sand and the ester-hardened sodium silicate sand process are adjusted, so that the alkaline phenol formaldehyde resin facing sand is firmly adhered to the ester-hardened sodium silicate backing sand, the advantages of the two molding sands are combined, the aim of discarding the defects is fulfilled, and the process has the advantages of low comprehensive cost, environmental protection and high economic benefit.

Description

technical field [0001] The invention relates to the technical field of casting technology, in particular to a composite molding process of alkaline phenolic resin face sand and ester hardened water glass back sand. Background technique [0002] The molding process of alkaline phenolic resin sand and ester hardened water glass sand is a common molding production process used in the foundry industry to produce steel castings. Alkaline phenolic resin sand and ester hardened water glass sand have their own advantages and disadvantages. [0003] The advantages of alkaline phenolic resin sand are: the steel castings produced have high dimensional accuracy, smooth surface, less gas generation during the pouring process, small porosity tendency of steel castings, and particularly good core sand collapse performance, which greatly reduces the labor of workers for sand cleaning. Labor intensity. [0004] The advantages of ester hardened water glass sand are: since the sand binder use...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a new type of basic steel castings to solve the problems of high cost, low quality, and environmental protection caused by their respective shortcomings in the molding process of the above-mentioned alkaline phenolic resin sand and ester hardened water glass sand. The composite molding technology of phenolic resin surface sand and ester hardened water glass back sand, based on the difference in chemical curing reaction mechanism between alkaline phenolic resin sand and ester hardened water glass sand, starts with adjusting the formula and molding operation method of the two molding sands, so that Alkaline phenolic resin surface sand and ester hardened water glass back sand are firmly bonded to achieve the advantages of kneading the two molding sands and abandoning their shortcomings. It has low overall cost, environmental protection, and good economic benefits.