Riser sleeve structure for preventing molten iron leakage in sand mold

Abstract

The invention relates to a riser sleeve structure for preventing molten iron leakage in a sand mold. A machined exhaust manifold and volute casting uses 18 risers in all. Riser sleeves are additionally arranged outside the risers to be used for enhancing heat preservation and saving molten iron. However, in use, the molten iron can be leaked from the matching portions between the riser sleeves andan outer mold to the space of the outer mold, and waste of the molten iron is increased on the contrary. At present, each riser sleeve is changed to be provided with a flange edge at the end, the flange thickness is interference fit with the outer mold, and meanwhile the portion, in contact with a feeding portion of a casting, of each riser sleeve is changed into a step layer, so that one seal structure is additionally arranged; and in this way, the leakage phenomenon is avoided in use, the molten iron is saved, and the feeding effect of the riser is improved.

Description

technical field [0001] Foundry industry model technology feeding riser plus riser sleeve is a structure that improves the matching accuracy of the riser sleeve and the outer mold, and is used to prevent molten iron from leaking from the gap into the outer mold hole. Background technique [0002] The company undertakes a casting of a turbocharger connected to the exhaust manifold of BorgWarner. The material is 53031016083 volute manifold of high nickel cast iron. There are 18 riser sleeves for the common feeding riser, and the use of riser sleeves can slow down the cooling speed of the riser, strengthen the feeding function of the riser, and save valuable high-nickel molten iron at the same time. However, when the riser sleeve is used, the cooperation between the riser sleeve and the outer mold is very likely to produce a contact gap. When the molten iron is filled, the molten iron will leak from the gap between the riser sleeve and the outer mold, and flow into the space of ...

AI Technical Summary

Problems solved by technology

However, when the riser sleeve is used, the cooperation between the riser sleeve and the outer mold is very likely to produce a contact gap. When the molten iron is filled, the molten iron will leak from the gap between the riser sleeve and the outer mold, and flow into the space of the outer mold, resulting in high The increase in the use of molten nickel iron

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