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Investment casting shell molding process

A molding process and investment technology, applied in the directions of casting mold components, casting molding equipment, casting molds, etc., can solve the problems of increased cracking tendency of castings, scrapped products, and increased casting costs, so as to reduce the cracking tendency and improve the surface quality. , the effect of reducing the number of shell layers

Active Publication Date: 2015-02-25
GUIZHOU ANJI AVIATION PRECISION CASTING
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AI Technical Summary

Problems solved by technology

Among them, increasing the number of coating layers of wax mold parts is a more commonly used technical means. However, this method increases the casting cost while also increasing the crack tendency of the casting. Although it reduces the leakage of the casting, it also leads to New problems, and crack defects in products will also directly lead to product scrapping

Method used

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  • Investment casting shell molding process

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Embodiment

[0048] Such as figure 1 As shown, the "bracket" casting produced by our company is a small thin-walled part with a minimum wall thickness of only 1.5mm. Shell strength, after the workpiece is processed, a fluorescent inspection is performed, and it is found that a large number of workpieces have crack defects at A, which leads to the scrapping of the casting, and the total scrapping rate is as high as 78.6%.

[0049] In view of the causes of the defect rate, our company has adopted the following new technology:

[0050] An investment casting mold shell molding process, comprising the following steps:

[0051] (1) Material preparation: prepare 80-100 mesh white corundum sand, 260-320 mesh white corundum powder, 75 mesh mullite sand, 260~320 mesh mullite powder, 30~60 mesh mullite sand, Prepare a sufficient amount of silica sol and surface coating additives;

[0052] (2) Preparation of surface coatings in separate piles

[0053] a. Preparation of surface coating: white corundu...

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Abstract

The invention discloses an investment casting shell molding process, belonging to the technical field of material molding. The process comprises the following steps: preparing materials, piling and preparing surface coatings, assembling and cleaning a wax module, coating, hardening, drying and dewaxing. According to the technical scheme, different mold layers are made of different coatings, and due to long-term stirring, the coatings are fully and uniformly mixed. Moreover, the amount of silica sol is increased in the surface coating, the surface quality of the shell surface layer is improved, the number of the mold shell layers is reduced under the conditions that the shell strength is guaranteed and run-out is avoided, the avoiding performance of the shell is improved, and the effect of reducing cracking tendency of the casting is achieved.

Description

technical field [0001] The invention belongs to the technical field of material molding, and relates to a casting method, in particular to an investment casting precision casting mold shell forming process. Background technique [0002] Investment precision casting is widely used in aviation, aerospace, weapons, electronics, ships and other technical fields. With the continuous development of casting technology, high-end products have put forward higher requirements for the structure, quality and precision of high-precision parts. As an important technology in the field of precision casting, precision casting is naturally put forward higher technical requirements. [0003] In investment casting, runaway is one of the common casting defects. Castings can only be scrapped if they run out of fire, thereby increasing the cost of castings and affecting economic benefits. Therefore, it is one of the important tasks for investment casting technicians to quickly find the main caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22C9/04
CPCB22C3/00B22C9/04B22C9/12
Inventor 刘井峰孔辉张明
Owner GUIZHOU ANJI AVIATION PRECISION CASTING
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