Casting defect repairing method

Abstract

A casting defect repairing method is characterized by comprising the following steps of drilling or tapping a threaded bottom hole capable of covering a defect of a casting according to the size of the defect of the casting, boring a pin hole in the upper portion of the threaded bottom hole of the casting, polishing the bottom of the casting and conducting chamfering by 45 degrees by a bench worker, manufacturing a plug in interference fit with the casting, placing the plug in liquid nitrogen to be cooled for at least half an hour, plugging the plug into the casting to be in interference fit with the casting after the plug is cooled, welding the bottom of the casting and the lower end of the bottom of the plug through a welding rod, knocking out puffy surfaces on the surface of the casting after welding of each layer is finished, detecting whether cracks exist or not, continuing to weld the next layer if no crack exists, stopping welding until the welding area is 3-5 mm higher than the bottom of the casting, and polishing protruding portions of the top end of the pin hole of the casting and the bottom of the casting by the bench worker. The casting defect repairing method has the beneficial effects of guaranteeing the quality and shape of a sand core, solving the problem that complex sand cores are difficult to produce, simplifying manual operation and improving working efficiency.

Description

technical field [0001] The invention relates to the field of mechanical processing, in particular to a method for repairing casting defects. Background technique [0002] Thin-walled parts such as oil pans and tanks will have certain defects in the castings due to air bubbles, cracks, sand inclusions and other casting factors in some parts of the castings, or processing factors such as excessive production and knife cutting during the processing process, which will affect the normal use of the castings. When encountering such defects, generally use coarse-pressed thread and thread glue to repair, the surface traces of the repair are obvious, and the sealing performance cannot meet the requirements. Contents of the invention [0003] Aiming at the deficiencies of the prior art, the invention proposes a method for repairing casting defects. The invention is easy to operate, the repair position will not rotate or drop, and the sealing performance can meet the requirements. ...

AI Technical Summary

Problems solved by technology

[0002] Thin-walled parts such as oil pans and boxes may have certain defects in castings due to casting factors such as air bubbles, cracks, and sand inclusions in certain parts of the castings, or processing factors such as excessive amounts and knives during processing, which will affect the normal use of castings.

When encountering such defects, generally use rough pressure thread and thread glue to repair, the repair surface marks are obvious, and the sealing performance cannot meet the requirements

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