Iron casting piece repairing method

Abstract

The invention discloses an iron casting piece repairing method. The iron casting piece repairing method comprises the following steps that a defect area on an iron casting piece is identified, polishing equipment is used for cleaning the area, oxidation layers and residue impurities are removed, and a round through hole with the diameter of 5-8mm is formed in the area, so that the defect can be removed from the iron casting piece, an acetylene-oxy torch is used for heating the round through hole wall to dark red, and the surface layer 2-3mm of the round through hole wall is in a liquid form; a round stick with the same material with the iron casting piece fills in the round through hole, and the acetylene-oxy torch is used for heating the round stick to a melting state, so that the round stick and the metal liquid on the surface layer of the round through hole wall are melted, borax is used as a fusion agent, the repairing area is polished and treated after fully fusing, solidifying and cooling to a normal temperature, and the repairing procedure is finished. The repairing method can guarantee the repairing efficiency and satisfy the repairing requirement.

Description

technical field [0001] The invention relates to a method for repairing iron castings. Background technique [0002] Iron castings produced by any process will often leave certain defects due to various unpredictable factors. These defects can be roughly divided into pores, shrinkage cavities, shrinkage porosity, slag holes and sand holes, etc. Some defects are large in size, endangering the safety of the overall structure of iron castings, and subversive quality accidents may occur. Most iron castings with such defects can only be scrapped, but some iron castings have defects only in the shallow surface, which can be repaired and rescued by appropriate methods. The traditional electric welding repair method can only be carried out on the non-processed surface of the iron casting. If it is carried out on the processed surface, the difference in density between the body of the iron casting and the welding material is large, resulting in a large color difference between the re...

AI Technical Summary

Problems solved by technology

The traditional electric welding repair method can only be carried out on the non-processed surface of the iron casting. If it is carried out on the processed surface, the difference in density between the body of the iron casting and the welding material is large, resulting in a large color difference between the repaired part and the body of the iron casting, which is difficult to repair. fulfil requirements

At present, there is a kind of fuse repair machine on the market, which can solve the above problems, but because the repair method is point contact, the actual contact point is only about 0.1mm each time, and the instantaneous current of the device is large when it is in use, and the device is prone to heat and Continuous operation is not possible, the efficiency is very low, and the repair surface often falls off due to poor fusion during processing, resulting in instability of repair quality