High silicon ball iron injection molding machine template casting preparing method

Abstract

Disclosed is a high silicon ball iron injection molding machine template casting preparing method. The method comprises the steps that raw materials comprises, by weight, 40-50% of pig iron, 20-30% of scrap steel, 20-30% of foundry returns, 1-1.4% of silicon iron and 0.004-0.005% of Sb, and are configured; melting is conducted, sampling analysis and blending composition are conducted; firstly, a rare earth magnesium nodularizer and Sb are correspondingly placed on the two sides of a bottom transverse blocking of a nodulizing bag, scrap steel sheets covers the surface of the rare earth magnesium nodularizer, and molten iron is poured into the nodulizing bag with Sb on one side, after the nodulizing reaction begins, a ladle-to-ladle inoculant is added into the nodulizing bag for inoculation, meanwhile, the molten iron is stirred, and melting of the ladle-to-ladle inoculant is promoted; and slag removal and pouring are conducted. The high silicon ball iron injection molding machine template casting preparing method has the advantages that the defects such as shrinkage and shrinkage cavity of a casting can be effectively solved, and the brittleness of the casting can be reduced, thus the scrap rate of during high silicon ball iron injection molding machine template casting manufacturing can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of high-silicon (Si 3.3%-3.5%) ductile iron injection molding machine template casting casting technology, in particular to a preparation method of high-silicon ductile iron injection molding machine template casting. Background technique [0002] High-silicon ductile iron injection molding machine template castings can optimize and reduce the wall thickness of castings due to their good mechanical properties, more uniform body properties, single-phase structure, uniform hardness, good cutting performance, long tool life, thermal fatigue resistance, high temperature strength, high temperature Oxidation resistance and other properties have been widely used at home and abroad. At present, the existing high-silicon ductile iron injection molding machine template castings have the following problems: due to the constraints of high silicon and low carbon, not only the castings are prone to shrinkage and shrinkage...

AI Technical Summary

Problems solved by technology

At present, the existing high-silicon ductile iron injection molding machine template castings have the following problems: due to the constraints of high silicon and low carbon, not only the castings are prone to shrinkage and shrinkage during manufacture, but also have high brittleness. The scrap rate is as high as 15% to 35%, especially when manufacturing castings with a wall thickness greater than 180mm, the above-mentioned defects are more likely to occur