Pressurizing method of diesel motor aluminium alloy cylinder metal mould low-pressure casting

Abstract

The invention discloses a pressurizing method for metal mold low-pressure casting of an aluminum alloy cylinder of a diesel engine, which comprises the following steps: step one, performing liquid-raising and pressurizing operations on an aluminum liquid; step two, performing filling type pressurizing operations on the aluminum liquid obtained in the step one; step three, pressurizing a cast obtained in the step two; step four, performing pressure-maintaining operations on the cast obtained in the step three; and step five, performing depressurizing operations on the cast obtained in the step four. The pressurizing method adopts a reasonable pressurizing specification to make the cast filled and molded smoothly and solidified sufficiently so that the structure of the cast is compact without generating hole defects to satisfy the sealing requirement, thus the method can make a high-compactness and high-strength aluminum alloy and a diesel engine cylinder body which is provided with a closed water-cooling cast-in cylinder sleeve.

Description

technical field [0001] The invention relates to a casting process for an engine cylinder body, in particular to a pressurization method for low-pressure casting of a diesel engine aluminum alloy cylinder body metal mold. Background technique [0002] The cylinder block is recognized as a cutting-edge technology in the domestic foundry industry, and the aluminum alloy diesel engine cylinder block is one of its main representative parts. The complex structure, large wall thickness difference, cast iron cylinder liner and closed water jacket structure lead to This product is still unable to produce cast aluminum cylinder blocks that meet the performance requirements in China, and defects such as pores and shrinkage are very easy to occur during production. [0003] The cylinder block is one of the key parts of the diesel engine, and the aluminum alloy diesel engine is one of the important symbols of the light weight of the automobile engine. Its quality directly affects the per...

AI Technical Summary

Problems solved by technology

[0006] In the traditional casting methods, mainly include die casting and metal gravity casting. These two casting methods cannot be used to make high-density, high-strength aluminum alloys with closed water cooling and cast-in cylinder liners for diesel engine cylinders. body

The closed water-cooled cylinder produced will have defects such as low structure density and holes in the castings, which cannot meet the sealing requirements

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