Production method for iron mold sand coated casting ductile cast iron truck steel plate spring base

Abstract

The invention discloses a production method for an iron mold sand coated casting ductile cast iron truck steel plate spring base. An inner cavity of an iron mold is made out in a shape-following manner according to the shape of the truck steel plate spring base, the thickness of a sand coated layer is 10 mm to 30 mm, and a closed type sprue is adopted; perforation is performed at the highest position of the appearance of an upper half mold, and a gas exhausting groove is formed in the parting surface of the iron mold; the middles of an upper mold bottom plate and a lower mold bottom plate of an outer mold are each provided with a heating device, and sand shooting is performed after the temperature reaches the requirement; and core installing, casting mold trimming, box closing, casting and box opening are performed after a sand core is made. By using the method, the yield is increased to 70% of iron mold casting or above from 50% of the original sand mold casting, the defects of subskin blowholes, organization looseness and the like are basically eliminated, the problems that the truck steel plate spring base is broken and the strength is not sufficient under the high pressure and high strength work environment are 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 sand mold casting by 30-50%.

Description

technical field [0001] The invention belongs to a casting process for producing truck leaf spring seats, in particular to a production method for iron mold sand-covered casting nodular cast iron truck leaf spring seats. 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 kin...

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-covered cast ductile iron truck leaf spring seat, which solves the common problems of gray cast iron of ductile iron truck leaf spring seat gray cast iron, internal looseness, surface quality, overall mechanical Problems with non-guaranteed performance

Images