Anti-deformation casting process for gray iron castings

By embedding high and low thermal conductivity material inserts in the thick-walled and thin-walled areas of gray iron castings respectively, and combining differentiated cooling and vibration aging treatments, the deformation problem of gray iron castings caused by differences in cooling rates is solved, achieving higher dimensional stability and production efficiency.

CN120606074APending Publication Date: 2025-09-09ZHUJI HANGJI CASTING CO LTD
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Patent Information

Application Number
CN202510571232.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-06
Publication Date
2025-09-09

AI Technical Summary

Technical Problem

During the casting process, gray iron castings shrink unevenly due to the difference in cooling rates between thick-walled and thin-walled areas, generating residual stress, which in turn causes deformation problems such as warping and twisting.

Method used

High thermal conductivity material inserts are embedded in thick-walled areas and high-speed cooling circuits are configured to accelerate cooling; low thermal conductivity material inserts are embedded in thin-walled areas and low-speed cooling circuits are used. Combined with differentiated cooling control, stepped pressurized solidification and directional vibration aging treatment, the uniformity of cooling rate is optimized.

Benefits of technology

Through differentiated cooling and vibration aging treatment, the deformation of gray iron castings is reduced, dimensional stability and material uniformity are improved, residual stress and internal defects are reduced, and production efficiency is improved.

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Abstract

The anti-deformation casting technology comprises the following steps that S1, a mold is pretreated, specifically, a, a thick-wall area and a thin-wall area are recognized according to a casting three-dimensional model, and a high-heat-conduction material insert is embedded into the mold corresponding to the thick-wall area; a low-heat-conduction material insert is embedded into the mold corresponding to the thin-wall area; b, a casting mold is preheated to 180-250 DEG C, and an anti-burnt-on sand coating is evenly sprayed on the inner surface of the mold; s2, low-pressure mold filling pouring is conducted, specifically, molten metal liquid is injected into a mold in a low-pressure mold filling mode; s3, solidification and vibration aging treatment, wherein the thick-wall area of the casting is solidified to 50%-70%; and S4, demolding treatment is conducted, specifically, the casting is demolded, and the casting is transferred into an argon protection heat preservation furnace after demolding. Through the synergistic effect of differential cooling control, stepped pressurization solidification and directional vibration aging, micro plastic deformation can occur in the casting, residual stress is homogenized, the dimensional stability of the gray iron casting is further improved, and deformation of the gray iron casting is reduced.
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