Nodular cast iron casting process

Abstract

The invention belongs to the technical field of nodular cast iron, and particularly relates to a nodular cast iron casting process. The nodular cast iron casting process comprises the following steps:S1, selecting raw materials, and melting scrap steel into molten iron; S2, rising the temperature of the molten iron, adding a carburant, raw pig iron, silicon iron, and nickel, and fully mixing to form a mixed solution; and S3, rising the temperature of the mixed melt, performing spheroidizing treatment and inoculation treatment, and after nodular cast iron melt is obtained, injecting the nodular cast iron melt into a sand mold through a pouring device for casting and forming to obtain the nodular cast iron. The pouring device is arranged between the medium-frequency smelting furnace and thesand mold, and fan blades and a vibrating rod are arranged in a pouring tank of the pouring device, so that nodular cast iron melt flowing through the pouring tank is subjected to the rotating actionof the fan blades and the vibrating action of the vibrating rod, thereby greatly improving the flowability of the nodular cast iron melt. The phenomenon of insufficient pouring caused by premature solidification of the nodular cast iron melt is effectively avoided, and the quality of the finally obtained nodular cast iron is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of nodular cast iron, in particular to a casting process of nodular cast iron. Background technique [0002] Ductile cast iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel. It is based on its excellent performance that it has been successfully used to cast some complex stress, strength, toughness, and wear resistance. Parts with high performance requirements. Ductile iron has rapidly developed into a cast iron material that is second only to gray cast iron and is widely used. The so-called "substituting iron for steel" mainly refers to ductile iron. Different from other cast irons, nodular cast iron undergoes spheroidizing treatment, which makes the graphite in nodular cast iron spherical, which has high strength, good plasticity and toughness. Its comprehensive mechanical properties are close to those of steel, and because of its go...

AI Technical Summary

Problems solved by technology

[0005] In order to make up for the deficiencies of the existing technology, the fluidity of the nodular cast iron melt in the existing nodular cast iron casting process decreases after spheroidization, which makes the nodular cast iron melt easy to solidify prematurely, resulting in the ductile iron melt being easily injected into the sand mold. Insufficient pouring occurs, resulting in poor quality of the finally obtained nodular cast iron, a casting process of nodular cast iron proposed by the present invention

Images