Precise investment casting technology

Abstract

The invention provides a precise investment casting technology. In the wax laminating process, polyethylene wax and SEBS elastomers are inserted into paraffin, microcrystalline wax and ethylhexyl stearate in a penetrating manner, a grid-interpenetration structure is formed, and the strength of the structure is improved; polyamide wax swells under the effect of xylene to generate paste thixotropic agents; and a net-shaped structure is formed, the good strength and the good heat resistance are achieved, the storage stability is good, and the quite good anti-settling effect is achieved in the coating system. As for coatings adopted in the precise investment casting technology, polyvinyl alcohol and hydroxymethyl cellulose serve as auxiliary binding agents, silica sol serves as a main binding agent, and fused alumina, cubic boron nitride and titanium nitride serve as main fireproof materials, so that a manufactured shell is good in heat resistance and high in strength. In this way, an alloy steel investment cast product manufactured with the precise investment casting technology is high in size accuracy, fewer in casting crack and reliable in quality, and a casting obtained through casting with the technology is smooth in surface and high in quality.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to an investment precision casting process. Background technique [0002] The investment casting process is usually divided into replica casting, molten lead casting and lost wax casting. Among them, lost wax casting is lost foam casting, also known as investment casting. Investment casting is a casting process with little or no cutting, and it is an excellent process technology in the foundry industry. Investment precision casting is widely used, not only suitable for casting of various types and alloys, but also the dimensional accuracy and surface quality of the castings produced are higher than other casting methods. Therefore, other casting methods are difficult to cast complex, high temperature resistant , Castings that are not easy to process can be cast by investment casting. [0003] The practical application of modern investment casting methods in industrial production...

AI Technical Summary

Problems solved by technology

[0006] However, there are still some problems in the existing domestic investment casting technology, such as many manufacturing processes, especially the existence of the molding process, which increases the labor intensity and increases the manufacturing cost.

Since the molding process of investment precision casting is simply to bury the mold shell with molding sand, the supporting strength and hardness of the molding sand are very poor, resulting in defects such as bulges, shrinkage cavities, and shrinkage of the casting product after pouring, and the finished product of the casting The low rate has always been a difficult problem for investment casting

Not only that, the low strength of the mold shell made by domestic investment casting, which leads to the defects of casting deformation and low casting dimensional stability, is also a problem that many companies in this industry are difficult to control