Casting process and casting mold for preventing air shrinkage cavities of automobile engine ductile iron flywheel shell casting

Abstract

The invention discloses a casting mold for preventing air shrinkage cavities of a ductile iron flywheel casing casting of an automobile engine, and relates to the technical field of casting, the casting mold comprises an exterior upper template mold, an exterior bottom template mold and a pouring system, the exterior upper template mold and the exterior bottom template mold are in butt joint to form a mold cavity, the pouring system is communicated with the mold cavity, and the mold cavity is communicated with the exterior bottom template mold. A precoated sand core is arranged in the mold cavity, the pouring system comprises a straight pouring gate, a transverse pouring gate, a first feeding head and a second feeding head, and the first feeding head and the second feeding head are located at geometric hot spots of a casting. The invention further discloses a casting process for preventing the air shrinkage cavity of the automobile engine ductile iron flywheel shell casting. According to the method, the situation that a hot spot is preheated when a feeding head neck of a pouring system is subjected to mold filling is effectively avoided, the feeding head can conduct instantaneous supply on liquid shrinkage and first volume shrinkage of molten iron in a casting mold in the casting mold filling and solidifying process, and the defect that an air shrinkage cavity is formed in a casting is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a casting process and a casting mold for preventing the air shrinkage cavity of a ductile iron flywheel shell casting of an automobile engine. Background technique [0002] Due to the needs of environmental protection and energy saving, the lightweight of automobiles has become the trend of automobile development in the world. As the quality of the car decreases, the fuel consumption of the car will also decrease, and the pressure on the tires and the braking system will also decrease. [0003] The traditional automobile engine flywheel shell is mainly made of gray iron HT250 material. With the overall requirements of lightweight automobiles, the OEM has adjusted the material of the engine flywheel shell, and gradually adjusted the gray iron HT250 to ductile iron QT450-12. Due to the adjustment of the product material, the strength of the product is greatly improved, so the wall...

AI Technical Summary

Problems solved by technology

[0004] Because the solidification properties of gray iron and ductile iron are different, gray iron is lamellar solidification, and the shrinkage rate is relatively small, while ductile iron is mushy solidification, which is not conducive to feeding shrinkage, and the shrinkage rate of ductile iron is large. This leads to ductile iron products prone to air shrinkage defects at geometric hot spots

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