Valve cover bolt hole lost mould and direct molding process thereof

Abstract

The invention discloses a valve cover bolt hole lost mould which comprises a valve cover lost mould body and bolt holes which are waist-shaped holes, wherein the bolt holes are formed in four corners of the valve cover lost mould body; long-dimension sides of the waist-shaped holes are transversely arranged; and long-dimension sides of the waist-shaped holes at the two sides of the valve cover lost mould body are vertically arranged. A direct molding process of the valve cover bolt hole lost mould comprises 10 specific steps in total. The bolt holes are changed into waist-shaped holes, so that influence of casting shrinkage is effectively avoided while mounting precision is not reduced; meanwhile, the bolt holes are directly molded by virtue of a lost foam process, so that the weight of a casting piece is reduced by 7.8%, mechanical processing cost is reduced by 35%, raw materials are saved, cost is reduced, and the product has higher technical content; the bolt holes are directly molded by virtue of the lost foam process, so that the energy is saved, the consumption is reduced, the labor intensity is reduced, and the plant environment is improved, and therefore, the direct molding process is an economical and environment-friendly green project.

Description

technical field [0001] The invention relates to the technical field of casting bolt holes of a valve cover, in particular to a lost foam for the bolt holes of a valve cover and a direct forming process thereof. Background technique [0002] The existing bonnet bolt holes are all obtained by machining. First, the bonnet is cast by casting technology, and then a bolt hole is directly opened on the upper surface of the bonnet with a drilling machine or other machines. The steps are roughly as follows: ①According to the product According to the drawings and casting requirements, the master mold is manufactured, including the mold for making the sand core of the air channel; ②The sand core of the air inlet and outlet is made according to the modeling requirements, ③Place the master mold in the sand box, inject clay sand and compact it ; ④ After mold drawing and mold repair, put the airway sand core into the clay sand mold as required, ⑤ After drying and closing the box, pour the ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method to solve the problem that the valve cover bolt holes in the prior art are all obtained by machining, and the cost is high. It is slightly different from the blank, resulting in uneven thickness of the outer wall of the bolt table, and also affects many defects such as aesthetics.

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