Casting method of large two-plate type injection molding machine mold plate casting

Abstract

The invention discloses a casting method of a large two-plate type injection molding machine mold plate casting. The casting method comprises the following steps that sand casting is carried out to form a casting cavity body and a pouring structure; raw materials comprise 35%-45% of pig iron, 30%-35% of scrap steel, 20%-35% of foundry returns and a carburant accounting for 0.6%-1.0% of the total amount of the pig iron, the scrap steel and the foundry returns, and the raw materials are put into a smelting furnace to be heated to melt furnace burden; spheroidizing is carried out by adopting a pouring method, then pure antimony accounting for 0.003%-0.005% of the mass of original molten iron is added, and finally an inoculant with the particle size of 3-8mm is added and compacted; the molten iron is subjected to slagging-off, inoculation blocks are placed for unstable silicon inoculation, standing is conducted, and the adding amount of the inoculation blocks accounts for 0.2%-0.4% of the mass of the molten iron; when the temperature is reduced to 1270-1360 DEG C, the molten iron is poured into the casting structure to form a casting; and after the casting is cooled, the casting of the application is obtained. The method has the advantages that according to the large two-plate type injection molding machine mold plate casting, an indirect chilling block which is convenient and accurate to position, and improves the cooling effect is contained, and the casting defects such as graphite distortion, shrinkage cavities, shrinkage porosity and sand inclusion can be reduced, so that the mechanical property of the casting is improved.

Description

technical field [0001] This application relates to the field of casting technology, in particular to a casting method for a large-scale two-platen injection molding machine template casting (the material is QT450-10, the outer diameter of the casting is 2127mm×2267mm×680mm, and the weight is 14000kg). Background technique [0002] my country is a big country in the production and export of injection molding machines. As the development direction of precision injection molding machines, high-precision large-scale two-platen injection molding machines are highly valued by injection molding machine manufacturers. The two-platen injection molding machine is different from the three-platen injection molding machine in the structure of key components such as the mold clamping unit, so it has more natural technical advantages in certain product industries, such as the auto parts industry. Compared with the three-platen injection molding machine, the two-platen injection molding mach...

AI Technical Summary

Problems solved by technology

Due to its own hinged structure (crank type) design, the three-platen injection molding machine has many defects such as difficult maintenance, easy wear, poor cleanliness, etc., which will eventually cause the whole machine to lose the parallel accuracy of the template and the repeatability of injection molding, so that it cannot Meet high-precision mold production

The external chill iron is divided into direct chill iron and indirect chill iron; the direct chill iron is in direct contact with the casting, and the surface of the chill iron is required to be smooth, free of oxide layer and oil, no pores or shrinkage, and the surface of the chill iron should be prevented from rusting during use. , if the above requirements are not met, it will lead to defects such as wrinkles and cracks on the surface of the casting; in addition, the direct external chill iron will absorb moisture for a long time, resulting in pore defects on the surface of the casting

Images