Investment casting technology for copper alloy casting

Abstract

The invention provides an investment casting technology for a copper alloy casting. Chlorcosane, Fischer-tropsch wax, stearic acid, glycerol ester of rosin, microcrystalline wax, polypropylene wax, polyisobutene, polyurethane elastomers and aldehyde resin serve as mold materials; and the polyisobutene, the polyurethane elastomers and the aldehyde resin are inserted into the chlorcosane, the Fischer-tropsch wax, the microcrystalline wax, the polypropylene wax and the stearic acid in a penetrating manner, and a formed structure has the good strength and the good heat stability. As for coatings adopted in the investment casting technology, cristobalite has the complete chemical inertness, and splitting decomposition can not occur at a quite high temperature; fused alumina has the beneficial effects of being high in melting point, compact in structure, good in heat conductivity and the like, the thermal expansion coefficient is small, and thermal expansion is even; and boron nitride is quiet low in friction coefficient, quite good in high-temperature stability and heat shock resistance, quite high in strength and heat conduction coefficient and lower in expansion coefficient. In this way, the copper alloy casting obtained with the investment casting technology for the copper alloy casting is high in strength and good in tenacity, no crack is generated on the surface, and the product quality is reliable.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to an investment casting process for copper alloy castings. Background technique [0002] Investment casting, also known as "lost wax casting", is an ancient casting method. The earliest investment casting found in my country was in the early Warring States period more than 2,400 years ago. Since the 1950s, investment casting has been gradually used in industrial production. After decades of development, investment casting has become a basic process in my country's machinery manufacturing industry and has formed a unique industry. Investment casting is widely used in manufacturing industries such as aviation, automobiles, machine tools, ships, internal combustion engines, gas turbines, telecommunication instruments, weapons, medical equipment and knives, and is also used in the manufacture of arts and crafts. [0003] The so-called investment casting process, simply put, is to use...

AI Technical Summary

Problems solved by technology

[0004] Due to the complexity of the investment casting process, there are many factors that affect the dimensional accuracy of the casting, such as the shrinkage of the mold material, the deformation of the investment mold, the change of the wire amount of the shell during the heating and cooling process, the shrinkage rate of the alloy, and the solidification process. Therefore, although the dimensional accuracy of investment castings is high, its consistency still needs to be improved.

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