Investment casting process for carbon-containing alloy material

Abstract

The invention provides an investment casting process for a carbon-containing alloy material. The investment casting process comprises the following steps of providing an operating platform, preparinga shell according to the shape of a pattern in a pre-drawn design drawing, preparing a protective cover according to the shape of the shell, covering the operating platform with the protective cover to form a closed space, pouring the carbon-containing alloy material smelted into a liquid state into the shell, and then transferring the shell into the closed space, so that the carbon-containing alloy material in the liquid state is condensed into a solid in the closed space to obtain a casting. By the adoption of the technical scheme, the condensation process of the alloy material is completedin the closed space, inflammables are combusted in the closed space to exhaust oxygen in the closed space, the probability that carbon family elements make contact with oxygen in air is reduced, the metallographic structure on the surface of the finally-formed casting is effectively protected, and the using performance of the casting is guaranteed.

Description

technical field [0001] The invention relates to the technical field of casting technology, in particular to a carbon-containing alloy material investment casting process. Background technique [0002] In the production process of investment castings, in order to ensure the casting of castings and reduce under-casting and cold insulation defects, when casting castings, the preheating temperature of the molten model shell is higher, and the temperature of the alloy liquid is also higher. In addition, for casting different alloy materials, The process parameters of the preheating temperature of the shell and the pouring temperature are very different. When pouring carbon-containing alloy materials, during the condensation process of the alloy material, the surface of the incompletely formed casting directly contacts the air, and carbon elements such as carbon, Elements such as silicon are easily oxidized with oxygen in the air under high temperature conditions, and the generate...

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Problems solved by technology

[0002] In the production process of investment castings, in order to ensure the pouring of castings and reduce under-casting and cold shut defects, when pouring castings, the preheating temperature of the melting mold shell is higher, and the temperature of the alloy liquid is also higher. In addition, for casting different alloy materials, The preheating temperature of the mold shell and the process parameters of the pouring temperature are very different. When pouring carbon-containing alloy materials, during the condensation process of the alloy materials, the surface of the casting that is not fully formed is directly in contact with the air, and carbon elements such as carbon, Silicon and other elements are very easy to oxidize and react with oxygen in the air under high temperature conditions, and the generated gas escapes, so that the surface of the final formed casting lacks carbon group elements, destroys the metallographic structure of the casting surface, and affects the performance of the casting

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