Sand-lined metal mold casting process for casting metro locomotive front end covers

Abstract

The invention relates to a sand-lined metal mold casting process for casting metro locomotive front end covers. According to the process, two sets of models, consistent with hollow inner cavities of the metro locomotive front end covers in shape, as core boxes are designed, meanwhile, models, consistent with residual structures of the metro locomotive front end covers besides the hollow inner cavities in shape, as female molds are designed, and associated iron mode shapes are designed; iron molding cavities coated with sand up and down and with sand coating layers are manufactured through a sand shooting machine; sand cores manufactured by the core boxes are bonded on the iron molding cavities to form complete molding cavities for casting the metro locomotive front end cover products; finally, molten iron is poured in the closed molding cavities; and after the pouring is finished, the molding cavities are opened to obtain the cast metro locomotive front end cover parts. The products cast by adopting the sand-lined metal mold casting process eliminate such defects as looseness, hole shrinkage and cracks; the casting products are stable in quality and compact in internal structure; and in addition, the sand-lined metal mold casting process is simple in production, low in labor intensity of workers and high in production efficiency.

Description

technical field [0001] The invention relates to an iron mold sand-covered casting process, in particular to an iron mold sand-covered casting process for casting the front end cover of a subway locomotive. Background technique [0002] In the existing industrial production, no-hardening sand molding technology is used to produce the front end cover castings of subway locomotives. This process has the following defects in the preparation process: due to the slow cooling rate of molten iron in the self-hardening sand process, defects such as shrinkage porosity, shrinkage cavities and cracks are easily generated inside the casting, resulting in the internal structure of the casting being not dense, and the quality of the formed casting product is not good Stable; in addition, the casting products of the front end cover of the subway locomotive cast in the no-bake sand process are not only low in spheroidization level (grade 3) but also rough in appearance, with large machining ...

AI Technical Summary

Problems solved by technology

This process has the following defects in the preparation process: due to the slow cooling rate of molten iron in the self-hardening sand process, defects such as shrinkage porosity, shrinkage cavities and cracks are easily generated inside the casting, resulting in the internal structure of the casting being not dense, and the quality of the formed casting product is not good Stable; in addition, the casting products of the front end cover of the subway locomotive cast in the no-bake sand process are not only low in spheroidization level (grade 3) but also rough in appearance, with large machining allowances, waste of materials, and increased machining costs; and production The process is complicated, the labor intensity of the workers is high, and the production efficiency is low

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