A super-long multi-tooth cast iron mandrel for metal mold casting and its casting method

Abstract

The invention relates to an ultra-long multi-tooth cast iron core rod for metal mold casting and a casting method for the ultra-long multi-tooth cast iron core rod in the technical field of casting. The ultra-long multi-tooth cast iron core rod for metal mold casting comprises a slender core rod main body which is horizontally arranged, wherein a plurality of teeth are uniformly arranged on one or both sides of the horizontal direction of the core rod main body; the section of each tooth is a triangle or trapezoid with a large upper part and a small lower part; the section of the core rod main body is a narrow and tall rectangle or polygon, and an upper opening of the section is wider than or as wide as a lower opening. According to the casting method for the ultra-long multi-tooth cast iron core rod for metal mold casting, the open metal mold casting is adopted, the teeth of a cooled casting is uplifted by a metal mold under the action of casting stress to be automatically de-molded to timely eliminate the casting stress, so that the teeth are prevented from being fractured, and a casting process for the core rod is simplified, and the casting productivity is improved.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to an ultra-long multi-tooth cast iron mandrel for metal mold casting and a casting method thereof. The cast iron mandrel is used in the mold core of the slender oil pipe pipeline when the metal mold casts the body of the internal combustion engine. Background technique [0002] Most of the internal combustion engine body castings have a slender oil pipe structure inside. This kind of oil pipe is generally cast as a whole, because if it is cast in sections, the oil pipe is slender, and the gap between the cores cannot be cleaned and machined. In order to prevent deformation and damage of the slender core, it is necessary to place a core bone in the core, and this type of core bone is disposable and cannot be taken out directly during the cleaning process. It can only be destroyed and then taken out. And because of the impact of the production batch of castings, the demand for this ...

AI Technical Summary

Problems solved by technology

[0003] 1. The ratio of sand to iron is large (15~50), the consumption of molding sand, resin and curing agent is large, and the cost is high;

[0004] 2. Modeling and shakeout are required, and the production efficiency is low;

[0005] 3. It is necessary to make wooden molds for foundry, and the wooden molds need to be maintained, and the cost is high

However, since the metal mold basically has no concession, the shrinkage resistance of the mandrel is very large during the solidification and cooling process, which may easily cause the mandrel teeth to break along the root

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