Microwave heating method for water glass sand mold or sand core

Abstract

The invention provides a microwave hardening method of water glass sand mold or sand core, belonging to the sand mold hardening method in casting industry. The method solves the problems that the existing microwave heating hardened water glass sand has high requirement on the die material and the sand mold or the sand core is easy to absorb the moisture, and improves the efficiency of the microwave heating hardened water glass sand. The method comprises the steps as follows: a shaping and core preparing step, a heating step, a demoulding step and a secondary heating step. The method has simpleprocess, low cost and good manipulation, can use normal wood die and plastic die, greatly reduces the requirement of the microwave heating on the die material, reduces the adding quantity of the water glass in the casting of water glass sand mold, and greatly improves the collapsibility and reusing performance of the water glass old sand; after demoulding, continuous heating is beneficial for theabsorption of the sand mold or sand core on the microwave, the energy resource consumption is reduced, the hardening efficiency is improved; and pouring in time can reduce the staying time of the hardened sand mold or sand core under the environment humidity as much as possible, and the anti-moisture disposal on the surface of the sand mold can shield the water vapor in the environment.

Description

technical field [0001] The invention belongs to a sand mold hardening method in the foundry industry, in particular to a microwave hardening method for a water glass sand mold or a sand core. Background technique [0002] Green and clean production is the development trend of the foundry industry in the 21st century. Many experts at home and abroad believe that sodium silicate sand is the molding sand most likely to realize green foundry production. The key to realizing the green and clean casting production of water glass sand is to completely solve the two major problems in the water glass sand process: poor collapsibility and difficulty in regenerating old sand. The most fundamental way is to reduce the amount of water glass added. At present, the hardening process of water glass sand mold or sand core includes: heating and hardening water glass sand, CO 2 Blowing hardening water glass sand, powder hardener no-hardening water glass sand and liquid organic ester no-harden...

AI Technical Summary

Problems solved by technology

[0007] The present invention proposes a microwave hardening method for water glass sand molds or sand cores, which solves the problems that existing microwave heating and hardening water glass sand has high requirements on mold materials, and sand molds or sand cores are easy to absorb moisture, and improves the efficiency of microwave heating and hardening water glass sand

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