Production method for sand-lined metal mold casting cylinder body

Abstract

The invention relates to a production method for a sand-lined metal mold casting cylinder body. In the method, the inner cavity of a metal mold is formed in a mold-following mode according to the shape of the cylinder body, the thickness of a mold-following sand-lined layer is 10 to 30mm, and a closed pouring gate is used; vent wires are arranged in a jet hole on the highest part and a core head part of an upper half mold, and gas exhaust slots are formed on a mold separating plane of the metal mold; heating devices are arranged in the middles of the lower mold base plate and the upper mold base plate of an outer mold, and sand is jetted after the temperature meets a requirement; and a sand core is made and loaded, a box is closed, pouring is performed, and the box is opened. By the method, yield is increased from 69 percent in the conventional sand mold casting to over 83.75 percent in metal mold casting, the defects of subsurface pinholes, a loose structure and the like are substantially overcome, the problem that the cylinder body leaks when working under pressure is solved, the overall mechanical performance is improved, sand treatment equipment, fields and a sand using quantity are reduced, and the severe environment of casting is improved. The production method is easy to control, the process flow is simple, and the production cost of the production method is 30 to 50 percent lower than that of a sand mold casting method.

Description

technical field [0001] The invention belongs to the field of casting technology for producing engine cylinder blocks, in particular to the production method field of iron mold sand-covered casting cylinder blocks. Background technique [0002] Iron mold sand-coated casting is a casting process in which a thin layer of molding sand (also known as coated sand) is covered around the inner cavity of a metal mold (also known as iron mold). It is a combination of metal mold casting and shell casting. The obtained castings have the advantages of high dimensional accuracy, good mechanical properties, saving labor, materials and equipment, and low production costs. [0003] In foreign countries, Germany, the former Soviet Union and other countries began to apply iron sand-covered casting to production around the 1960s, mainly for the production of ductile iron crankshafts, brake hubs, brake discs, cylinder liners, bomb shells, tank tracks and motor bases. And more than 30 kinds of ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a production method of iron mold sand-coated casting cylinder block which can solve the common problems of gray cast iron cylinder block, such as loose structure, poor surface quality, and unguaranteed overall mechanical properties.