Casting repairing method

By using a transparent rigid plastic box and anaerobic adhesive combined with a vacuum pump for curing, the leakage problem caused by the porosity defect of the casting was solved, enabling flexible repair of the casting and cost reduction. It is especially suitable for large and complex pressure-bearing castings.

CN120861374APending Publication Date: 2025-10-31SHANGHAI ELECTRIC GRP SHANGHAI ELECTRIC MASCH CO LTD
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Patent Information

Application Number
CN202510959101.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-11
Publication Date
2025-10-31

AI Technical Summary

Technical Problem

In the existing technology, it is difficult to effectively repair the leakage problem of castings caused by casting porosity defects. Traditional welding repair methods are time-consuming, labor-intensive and costly, while casting repair agents cannot effectively repair local defects in large castings.

Method used

The leak was sealed with a transparent rigid plastic box, anaerobic adhesive was poured in and cured by a vacuum pump, and the transparent plastic box was used for visual monitoring to ensure the reliability and specificity of the repair.

Benefits of technology

It enables flexible and efficient casting repair, reduces the risk of casting scrap, and is particularly suitable for large and structurally complex pressure castings, reducing repair costs and improving repair reliability.

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    Figure CN120861374A_ABST
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Abstract

The invention discloses a casting repairing method which comprises the following steps: S1, determining the leakage position of a casting during pump pressure or pump leakage, and carrying out PT flaw detection on a defect; s2, a box is built on the leakage position through transparent hard plastic, and an opening is formed in the top of the box; s3, anaerobic adhesive is poured into an open box, and whether a leakage position exists or not is observed on the reverse side of the casting; s4, if the leakage position is found, PT flaw detection is conducted on the leakage position, and whether the leakage position is a crack or not is determined; s5, after it is determined that the leakage position is not a crack, the surface of the leakage position is covered with glue, and the glue is hardened; and S6, after it is determined that the leakage position does not leak again, anaerobic adhesive is added into the open box, waiting is carried out for 10-15 minutes, the anaerobic adhesive flows into the casting defect, and the open box is sealed. The method solves the problem that the large pressure-bearing casting is loose, the repairing process is simplified, and the repairing cost is reduced.
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