"Point" pouring process system for ductile iron castings

Abstract

The invention relates to a point-type pouring process system for a nodular iron casting. According to the invention, a sprue, a horizontal runner, an ingate, a riser and riser neck are integrated into a functional body through optimization and concentration, and the functional body exerts multiple effects; i.e., the functional body can be used as the sprue for pouring and exerts buffering, filtering, pouring guiding, slag collecting and feeding effects and other effects, thereby realizing multiple purposes of the functional body. Moreover, through combined design of a chiller and a pad, a progressively-solidifying feeding channel is formed. Thus, the point-type pouring process system is constructed.

Description

Technical field

[0001] The invention relates to a "point type" pouring process system for ductile iron parts. Background technique

[0002] The way of solidification of ductile cast iron is that the inside and outside are solidified almost at the same time, so it is easy to form microscopic shrinkage; at the same time, the solidification of the casting determines that the solidified layer on the surface of the casting is very thin, so that a solidified crust of sufficient strength cannot be established, plus eutectic The solidification time is longer, the graphitization expansion of the eutectic transformation is larger, and the mold wall moves outside when the mold stiffness is insufficient, which causes the shrinkage cavity and shrinkage porosity to further increase. According to statistics, the volume of shrinkage and porosity of ductile iron is larger than that of ordinary gray cast iron, white cast iron and carbon steel. The volume of shrinkage and porosity of ductile iron i...

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