Water glass and resin mixed CO2 hardening method

Abstract

A CO2 hardening method for the mixture of water glass and resin used for casting sand mould includes such steps as proportionally mixing the sand, water glass and resin, forming mould, and introducing CO2 gas to harden the mould. It features that after casting, the resin adhesive prepared from water glass and resin is carbonized, resulting in high collapsibility.

Description

Technical field: [0001] The invention relates to a kind of water glass and resin mixed CO 2 The hardening method is mainly used for sand molds for castings, and belongs to the field of casting sand mold manufacturing. Background technique: [0002] Water glass sand: water glass is an inorganic binder widely used in casting production. There are many ways to harden it, but the most widely used is CO 2 hardening method. CO 2 Water glass sand has many advantages: first, it hardens quickly, is easy to control, and has high production efficiency; second, it has high mold strength and good casting quality; Low cost (more than 2,000 yuan per ton). However, it has insurmountable shortcomings: first, the residual strength of the mold is high, the collapsibility is poor, and it is difficult to clean the casting; second, the mold is easy to absorb moisture and the preservation is not good; After that, the casting mold is pulverized, and the surface strength is low, which cannot me...

AI Technical Summary

Problems solved by technology

However, it has insurmountable shortcomings: first, the residual strength of the mold is high, the collapsibility is poor, and it is difficult to clean the casting; second, the mold is easy to absorb moisture and the preservation is not good; After that, the casting mold is pulverized and the surface strength is low, which cannot meet the requirements of use

CO 2 Hardened alkaline phenolic resin is a new type of binder. It has fast hardening speed, high production efficiency, high mold strength, low residual strength and good collapsibility, but it is expensive (more than 12,000 yuan per ton), and the production cost Too high, currently it is mainly used on cores with very high sand production requirements, but for general or not particularly high sand production cores, it is not used due to price factors

Therefore, synthetic resin sand cannot be widely applied so far as a foundry binder.

Images