Coating for foundry and its preparation method and application

Abstract

The invention belongs to the technical field of casting and provides coating for casting and a preparation method and application thereof. The coating for casting is prepared from, by weight, 50-80 parts of tabular corundum, 3-4 parts of a suspending agent, 1-4 parts of a thixotropic agent, 1-2 parts of a binding agent, 0.2-0.3 part of fortifier, 0-0.05 part of auxiliaries and 25-35 parts of a liquid carrier. The preparation method comprises the following steps that 80-90% of the total weight of the liquid carrier serves as substrate liquid, the suspending agent, the thixotropic agent, the binding agent, the fortifier and the auxiliaries are added into the substrate liquid and stirred; the tubular corundum is added, and stirring is conduced; the left liquid carrier is added, and the baume degree of mixture is regulated so that the coating for casting can be acquired. The coating for casting is applied to the production process of casting parts. According to the coating for casting and the preparation method and application thereof, the tabular corundum is applied to the coating for casting for the first time, abreuvage and chemical sand burning can be avoided, the surfaces of the casting parts can be smoother, and the surface quality of the casting parts is improved.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a coating for casting and its preparation method and application. Background technique [0002] Casting, as an earlier metal thermal processing technology mastered by humans, has a history of about 6,000 years. Casting refers to the processing method of melting solid metal into liquid and pouring it into a mold of a specific shape, and waiting for it to solidify and form. The metals to be cast include: steel, copper, iron, aluminum and other non-ferrous metals, etc. The common casting materials are raw sand, clay, water glass, resin and other auxiliary materials. Special casting molds include: investment casting, lost foam casting, metal casting, ceramic casting, etc. [0003] Casting, as a country's basic heavy industry category, has always been improving in craftsmanship, technology and materials. Casting coatings, as one of the important components of casting auxiliary mater...

AI Technical Summary

Problems solved by technology

[0004] However, the foundry coatings in the prior art still have defects during use, which are prone to chemical and mechanical sand sticking

Among them, chemical sand sticking is due to the chemical reaction between the high temperature metal liquid and the coating and casting mold to form metal oxides, which have strong adhesion to the coating and casting molding, and can firmly adhere the casting molding to the surface of the casting. Form a series of low-melting point compounds (in the thick wall and corner of the casting, etc., there are more low-melting point substances, and the sticky sand layer is thicker), resulting in chemical sticky sand of the casting; sometimes although sticky sand is not produced, it adheres to the surface of the casting A layer of hard-to-remove paint that creates sticky dust

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