Technological process for treating casting surface

Abstract

The invention provides a technological process for treating a casing surface and belongs to the technical field of production and manufacture of casting parts. According to the technological process, industrial alcohol is added to an alcohol-based tellurium powder coating before painting the alcohol-based tellurium powder coating on a sand core surface; the alcohol-based tellurium powder coating and the industrial alcohol are prepared into a painting liquid with a baume degree of 29 to 31; the tellurium in the painting liquid accounts for 4 to 8% of the total weight of the painting liquid; while being painted on the sand core surface, the painting liquid is stirred at every 2 to 5 minutes. The technological process is improved in concentration ratio of the painting liquid, design of a casting sand mould, usage of an adhering preventing sand coating, casting temperature and setting of temperature holding time, so that a coating formed by painting the painting liquid is stable in performance and free of failure and falling off, a phenomenon that the adhering sand is sintered in an inner cavity of a casting water jacket is avoided, and the leakage rate is greatly decreased.

Description

Technical field [0001] The invention belongs to the technical field of casting production and manufacturing, and more specifically, relates to a process method for treating the surface of a casting. Background technique [0002] Tellurium is a rare material. It is a by-product obtained in the process of refining copper. It is a transition element between metal and non-metal. It has a slight metallic luster, does not have ductility, and is easily crushed. Adding it to the molten gray iron liquid can promote the cooling of the metal in a short time and accelerate the solidification rate, thereby hindering the graphitization and refining the grains to obtain dense castings. For a long time, casters have used tellurium to treat gray iron. Organization and performance are improved. Tellurium powder coating uses the metallurgical effect of tellurium and the principle of surface alloying to alloy the surface of the casting to form a white layer on the surface of the required casting to...

AI Technical Summary

Problems solved by technology

However, there are still some problems in the process of use, such as: 1. The cost of tellurium powder is high, and the production cost of castings in large quantities will increase and the benefit will decrease; 2. It is easy to be washed away by molten iron during the pouring process, resulting in failure; 3. 1. The inner cavity of the casting painted with tellurium powder coating is prone to sintering and sand sticking, which affects the apparent quality of the casting and increases the amount of post-cleaning and grinding

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