A low-pressure metal mold for an aluminum flywheel housing

Abstract

A low-pressure metal mold for an aluminum flywheel shell, comprising an outer mold, a sand core installed in the outer mold, and a pouring system; the outer mold includes a bottom mold, a side mold and an upper mold for forming the shape of the outer wall of an aluminum alloy flywheel shell; the pouring system includes A sprue, a runner, and an annular inner runner connected with the casting cavity; the runner includes a lower runner and an upper runner; the lower runner is arranged at the bottom of the sand core, and the sprue , the upper runner, and the annular inner runner are arranged on the bottom mold, and a filter screen is arranged in the sprue, and the sprue is connected with the annular inner runner through the runner to form a casting channel for molten aluminum; the upper mold is equipped with a row The air rod is used to ensure the smooth exhaust of the sand core, and the matching insert is also installed on the upper mold. The invention has a good slag avoiding effect, does not produce the phenomenon of aluminum liquid venting, can better ensure product quality, improves product qualification rate, does not need to be provided with any riser to feed castings, and improves the process yield.

Description

technical field [0001] The invention relates to a low-pressure metal mold. Background technique [0002] As one of the key components of the automobile engine, the flywheel housing is installed between the engine and the gearbox, externally connected to the crankcase, starter, oil pan, and built-in flywheel assembly, which plays the role of connecting the body, protection and carrier. The aluminum flywheel housing is complex in shape and large in size, and is a large aluminum alloy thin-walled part. At present, most of the aluminum flywheel shells adopt the gravity casting process of introducing lap gates from the front end. This process requires more and larger risers to feed and disperse the thermal joints respectively, which results in a low yield of the process and increased risk in the subsequent process. Mouth removal is heavy and difficult, and there are many subcutaneous pores on the surface of the product. SUMMARY OF THE INVENTION [0003] The purpose of the pre...

AI Technical Summary

Problems solved by technology

At present, most of the aluminum flywheel shells adopt the gravity casting process of introducing lap gates from the front face. This process needs to set up more and larger risers to feed the scattered hot spots, which results in low process yield and risk of subsequent processes. The removal of the mouth is heavy and difficult, and there are many subcutaneous pores on the surface of the product

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