Production technology method for casting complex special-shaped pipe through grey cast iron lined sand

Abstract

The invention discloses a production technology method for casting a complex special-shaped pipe through grey cast iron lined sand. The production method comprises the steps that, an air exhaust hole needle is locally arranged on the portion of a core head of an upper half die, and penetrates out of a box face, a base composite mold core manner is adopted in a lower sand box, a mold core is of a conveniently-split structure, a molten iron runner of a pouring system is from a sprue cup to a cross sprue to a straight sprue, the runner can be divided into two branched straight sprues in a balanced manner by the transverse sprue through a filter screen, the two branched straight sprues are each divided into an upper inner sprue and a lower inner sprue to castings, and a direct hole ceramic filter screen is adopted; and the method has the beneficial effects that after paint is subject to dip-coating on a single sand core, the sand cores are assembled to form multi-flashing sand eye air holes, defects of subcutaneous blowhole, structure shrinkage and the like are overcome, and the leakage problem of an exhaust pipe is solved.

Description

technical field [0001] The invention belongs to the field of mechanical casting, in particular to a production process for gray cast iron sand-covered casting of complex special-shaped pipes. Background technique [0002] At present, many enterprises in China also apply the sand-covered iron casting process to produce various castings such as ductile iron crankshafts, camshafts, balance shafts, pressure-resistant valve bodies, cylinder liners, and wear-resistant toothed discs. It is still blank to use the iron mold casting technology to produce the complex multi-layer water cavity exhaust pipe of heavy machinery. Most of the foundry manufacturers in my country and even in the world use the static pressure casting method to produce heavy machine complex multi-layer water chamber exhaust pipes. The quality of such exhaust pipes produced by this process is poor, and the dimensional accuracy is difficult to control. Coal powder is needed, a large amount of sand is used, and the ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a composite iron mold coated with sand that can solve the problems of loose structure, poor surface quality, unguaranteed overall mechanical properties and easy quality control of the complex multi-layer water cavity exhaust pipe of gray cast iron heavy machinery. Production method of complex multi-layer water cavity exhaust pipe of casting Juki