Precision casting method for large castings
A technology for large-scale castings and precision casting, which is applied to casting molding equipment, molds, cores, etc., and can solve the problems affecting the quality of large-scale stainless steel castings, the difficulty of ensuring the strength of the mold shell, and the unclean removal of carbides. The effect of hoisting equipment, guaranteed strength and convenient operation
Active Publication Date: 2012-05-02
HUSN CASTING ANHUI YINGLIU GROUP
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Problems solved by technology
However, for large-scale castings, due to the large size of the castings, larger molds, large-scale hoisting equipment and drying equipment are required for production, which not only complicates the equipment but also makes it difficult to guarantee the quality of the castings. , the strength of the mold shell is not easy to guarantee, especially in the production of large stainless steel castings and metal alloy castings, because the carbides in the cavity are not cleaned, which seriously affects the quality of large stainless steel castings
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[0020] refer to figure 1 , a method for precision casting of large castings, characterized in that: it comprises the following steps:
[0021] (1) Use computer to design three-dimensional graphics of large castings;
[0022] (2) The polyethylene bead raw material is expanded into the original model whose external dimension is larger than the large casting after one foaming, and according to the three-dimensional graphics of the large casting designed by the computer, the original model is engraved with a five-axis linkage tool to make a large casting model ;
[0023] (3) After the large casting model is stained with silica sol paint, sprinkle a layer of ceramic powder or a mixture of ceramic powder and gangue powder on the large casting. The ratio of ceramic powder and coal gangue powder can be adjusted according to the strength of the large casting. There is a choice, and then dry the large castings for 30-40 minutes in an environment with a humidity of 30-40%, an automatic...
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Abstract
The invention relates to a precision casting method for large castings, which comprises the following steps of: designing the three-dimensional figure of a large casting by a computer; graving the original model by using a five-axis linkage cutter to make a large casting model; then adhering multiple layers of silica solution paint on the large casting model, scattering sand and drying; then placing the large casting model in a calcinator for calcinations twice, wherein metal solution is poured in a model shell; after the metal solution is formed, crushing the model shell to obtain the casting; detecting the inner quality of the large casting by using a radiographic inspection method and detecting the overall dimension of the large casting by a tri-coordinate detector; and performing post-treatment for the large casting. In the invention, the mould and large lifting equipment are omitted and the strength of the model shell is ensured. Especially when in large stainless steel, non-ferrous metal or metal alloy casting production, because the model shell is calcinated twice and poured with the metal solution under protection of argon, the carbides and oxidizing atmosphere in the model shell are eliminated completely, thereby ensuring the quality of the large stainless steel, non-ferrous metal or metal alloy castings.
Description
technical field [0001] The invention relates to a precision casting method, in particular to a precision casting method for large castings. Background technique [0002] The investment casting method commonly used at present usually obtains castings from mold making, wax mold making, shell making, roasting, and pouring metal. However, for large-scale castings, due to the large size of the castings, larger molds, large-scale hoisting equipment and drying equipment are required for production, which not only complicates the equipment but also makes it difficult to guarantee the quality of the castings. , the strength of the mold shell is not easy to guarantee, especially in the production of large stainless steel castings and metal alloy castings, because the carbides in the mold cavity are not cleaned, which seriously affects the quality of large stainless steel castings. Contents of the invention [0003] The purpose of the invention of the present application is to overc...
Claims
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IPC IPC(8): B22C9/04B22C7/02
Inventor 杜应流
Owner HUSN CASTING ANHUI YINGLIU GROUP