Method of casting engine cylinder head with lost foam

Abstract

A method for casting an engine cylinder head with lost foam, which relates to the field of casting technology. The process method is as follows: first, use three-dimensional software to design a model for manufacturing lost foam dies, and manufacture corresponding molds; Inject expandable molding beads, heat and cool to produce individual mold pieces. And dry; the dried mold pieces are bonded as a whole according to the requirements, and the casting system is bonded to obtain the lost foam model; the surface of the lost foam model is dip-coated with a special coating and then dried; the processed lost foam model Put it in the three-dimensional vibrating sand box, after injecting dry sand, cover the surface with a layer of film; inject the smelted solution into the gating system of the lost foam model, the lost foam model is melted, the space is replaced by the solution, and the solution is cooled After solidification, take out the casting from the box. The invention improves production efficiency, reduces labor force, reduces labor cost and manufacturing cost.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a method for casting an engine cylinder head with lost foam. Background technique [0002] The cylinder head is an important part of the engine, and because the air passage in the cylinder head plays an important role in the whole engine, the shape of the air passage is complex and the technical requirements are high, and the shape of the air passage is not processed, which requires casting To achieve high accuracy, most of the casting of cylinder heads is now sand casting, and the steps are roughly as follows: ① Manufacture the master mold according to the product drawings and casting requirements, including the mold for making the airway sand core; Sand cores of the airway and airway, ③Put the master mold in the sand box, inject clay sand and compact it; ④After the mold is drawn and repaired, put the airway sand core into the clay sand mold as required, ⑤After After drying and...

AI Technical Summary

Problems solved by technology

The cylinder head cast by this method has the following disadvantages. ①The air passage of the cylinder head must use sand cores. Moreover, when the sand cores are placed in the sand mold, accumulated errors and offsets will occur, resulting in a decline in the quality of the cylinder head. , or even scrapped, which requires highly skilled workers and difficult operation, resulting in time-consuming, labor-intensive and waste of materials

②In order to prevent the deformation of the casting, the method of increasing the reserved processing amount is adopted, which causes the casting to be heavy

③The surface quality of castings is poor due to manual modification and operation

④ With this casting method, castings are prone to defects such as sand inclusions, pores and loose structures

⑤ In the later cleaning work, the labor intensity of the workers is high and the environmental pollution is serious

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