A method of increasing the local strength of a formwork

By attaching steel rods during the mold shell preparation process to increase the local strength of the mold shell, the problems of mold shell bulging and cracking were solved, the yield and production efficiency of castings were improved, the operation process was simplified, and the labor intensity was reduced.

CN122142240APending Publication Date: 2026-06-05CSIC NO 12 RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CSIC NO 12 RES INST
Filing Date
2026-04-15
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

During investment casting, the mold shell may bulge locally due to the rapid expansion of the wax pattern during the dewaxing process, causing dimensional deviations or localized looseness in the casting. This is especially true in large flat surfaces and narrow blind groove structures, where mold shell cracks or fractures are prone to occur, affecting the casting yield and production efficiency.

Method used

During the mold shell preparation process, steel rods are attached to areas prone to bulging to form a skeleton. The high strength and rigidity of the steel rods are used to increase the local strength of the mold shell, avoiding the expansion of the wax mold that compresses the mold shell and the bulging and cracking of the mold shell caused by the static pressure of the metal during the casting process.

Benefits of technology

It effectively improves the yield of mold shells and castings, reduces the amount of subsequent finishing work, lowers labor costs, improves production efficiency, and avoids local bulging and cracking of castings.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present application relates to a method for increasing the local strength of a mold shell. The steps of the present application are as follows: 1) according to the casting process of the casting, design and manufacture the casting, the pouring system mold, and complete the pouring system wax mold pressing; 2) group tree; 3) carry out the first layer of wax mold module surface layer of slurry and sand; 4) carry out the second layer of slurry and sand; 5) carry out the third layer of slurry and sand; 6) according to the cuboid steel bar of wax type surface processing, immerse the wax material on the surface; 7) after the third layer is dried, blow the surface floating sand, and the steel bar prepared in step 6) is bonded in the easy swelling part of the casting by using silica sol; 8) carry out sealing slurry; 9) carry out dewaxing, baking and complete the shell. The present application reduces the workload, saves the labor cost, improves the yield of the mold shell and the casting, the production efficiency and the delivery schedule.
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