Multi-way valve sand mold sand-lined casting mold

Abstract

The invention discloses a multi-way valve sand mold sand-lined casting mold which comprises a sand box, a resin sand casting mold, a precoated sand shell mold and a precoated sand core, the resin sand casting mold is located in the sand box, the precoated sand shell mold is located in the resin sand casting mold, the precoated sand core is located in a cavity formed by a precoated sand upper shell mold and a precoated sand lower shell mold, and the inner shape of the cavity is matched with the outer shape of a multi-way valve to be cast. Through resin sand casting, the casting strength and rigidity are improved, and deformation and shrinkage porosity caused by molten iron shrinkage and graphite expansion in the solidification process can be avoided; secondly, through the precoated sand shell mold and the precoated sand core, the precision and the surface quality of the multi-way valve can be improved; by means of shell mold casting, the processes of positioning, box overturning, box closing and the like can be omitted, and then the purpose of improving the working efficiency is achieved; and in addition, compared with iron mold sand coating, the mold input cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a sand-covered casting mold of a multi-way valve sand mold. Background technique [0002] The multi-way valve is a common hydraulic component in the hydraulic system of construction machinery. It needs to connect flanges, the outer wall structure is thicker, and there are many internal channels, the size of the oil channel is different, and the internal structure is complex. The traditional casting process is to divide the middle oil channel sand core into multiple sand cores and use the hot core box for production. The outer mold is made of resin sand, which is easy to cause problems such as poor surface quality and high scrap rate, and often occurs core breakage, deformation, Sticky sand and veining problems. [0003] Therefore, how to improve the casting pass rate of the multi-way valve is a technical problem to be solved by those skilled in the art. Contents of the inventi...

AI Technical Summary

Problems solved by technology

The traditional casting process is to divide the middle oil channel sand core into multiple sand cores and use the hot core box for production. The outer mold is made of resin sand, which is easy to cause problems such as poor surface quality and high scrap rate, and often occurs core breakage, deformation, Sticky sand and veining problems

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