Production method for iron mold sand coated process casting cylinder cover

Abstract

The invention discloses a production method for an iron mold sand coated process casting cylinder cover. An inner cavity of an upper iron mold is made out in a shape-following manner according to the shape of the cylinder cover, the thickness of a shape-following sand coated layer is 8 mm to 10 mm, and a closed type sprue is adopted; a lower iron mold is a hollow iron mold frame, the surface of an inner cavity is not coated with sand, the shape size is machined according to the size of a cylinder cover bottom disk sand core outer frame, and a sand core is installed into the lower iron mold frame as a whole during core installing; and core installing, box closing, casting and box opening are performed after the sand core is made. By using the method, the yield is increased to 80% of iron mold casting or above from 72% of the original sand mold casting, the defects of subskin blowholes, organization looseness and the like are basically eliminated, the problem that the cylinder cover leaks during pressure work is solved, the overall mechanical performance is improved, and sand treatment devices, sites and the sand using amount are reduced; and the severe environment for casting is improved. The process is simple in procedure, control is easy, and the production cost is lower than that of a common sand mold casting process by 30-50%.

Description

technical field [0001] The invention belongs to the field of engine cylinder head casting technology, in particular to a production method for casting a cylinder head by iron mold sand-covering technology. 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 casting has the advantages of high dimensional accuracy, good mechanical properties, compact structure and low production cost. [0003] Domestically and internationally, the iron mold sand-covered casting process is mainly used in the casting production of more than 30 types of castings such as ductile iron crankshafts, camshafts, balance shafts, pressure-resistant valve bodies, cylinder liners, wear-resistant castings, and cylinder blocks. It is still blank to use the iron mo...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a production method of iron mold sand-covered casting cylinder head which can solve the common problems of cylinder head castings such as structure shrinkage, poor surface quality and high leakage rate.