A Casting Process for Preventing Leakage of Automobile Ductile Iron Steering Gear Castings

Abstract

The invention discloses a casting process for preventing automobile ductile cast iron steering gear shell cast leakage, and relates to the technical field of casting. The casting process comprises thefollowing steps: S1, taking molds; S2, covering a sand box on an upper template mold, adding damp molding sand, and disengaging the upper template mold and the sand box to form a damp mold sand uppercavity, and covering the sand box on a lower template mold, putting a chilling block in the lower template mold, adding damp molding sand, and disengaging the lower template mold and the sand box toform a damp molding sand lower cavity; S3, putting a coated sand core into the cavities, and butting and clamping the damp molding sand upper cavity and the damp molding sand lower cavity to form a cavity; and S4, pouring an iron liquid into the cavity, and after the pouring is finished, separating the casting with the sand to obtain the casting. According to the process, iron liquid supplementation, to steering gear shells, of dead heads in iron liquid mold filling and condensation process, self-complementation generated by graphene expansion in casting solidification process, and local chilling blocks are utilized to overcome the defect of forming shrinkage blowholes at hot sections of castings.

Description

technical field [0001] The invention relates to the technical field of casting castings, in particular to a casting process for preventing the leakage of castings of automobile nodular iron steering gear casings. Background technique [0002] Casting hot spot refers to the node or local area in the casting that solidifies slower than the surrounding metal during the solidification process of molten iron. Automobile steering gear generally produces two types of hot joints during casting, namely the first hot joint and the second hot joint. The first heat joint is located near the eccentric shaft hole and the side hole of the casting, and the second heat joint is located at the installation shaft of the lower casting. The first hot joint is called a larger hot joint, and the second hot joint is called a smaller hot joint, that is, the solidification speed of molten iron at the second hot joint is greater than that at the first hot joint. [0003] Automobile steering gear is ...

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