Casting Method of Template Casting for Large Two-Plate Injection Molding Machine

Abstract

A method for casting template castings of a large two-plate injection molding machine, comprising: sand casting a casting cavity body and pouring structure; raw materials: 35% to 45% of pig iron, 30% to 35% of scrap steel, 20% to 35% of recycled materials, Carburizer: 0.6% to 1.0% of the total amount of the above-mentioned pig iron, scrap steel, and returned materials, put into the smelting furnace to heat to melt the furnace materials; use the rushing method for spheroidization, and then add 0.003% to 0.005% of the original molten iron mass % of pure antimony, finally add an inoculant with a particle size of 3-8mm and compact it; remove the slag from the molten iron, place the inoculation block to incubate with floating silicon, and let it stand. The amount of the inoculant block added is 0.2% to 0.4% %; when the temperature drops to 1270°C to 1360°C, the molten iron is poured into the casting structure to form a casting; after the casting is cooled, the casting of the present application is obtained. It has the advantages of convenient and accurate positioning, indirect chill iron for improving cooling effect, and can reduce casting defects such as graphite distortion, shrinkage cavity, shrinkage porosity, sand inclusion, etc., thereby improving the mechanical properties of the casting.

Description

technical field [0001] The present application relates to the technical field of casting, in particular to a casting method for a large two-plate injection molding machine template casting (material is QT450-10, casting size outer diameter 2127mm×2267mm×680mm, weight 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 clamping unit, so it has a more natural technical advantage in some product industries, such as the auto parts industry. Compared with the three-platen injection molding machine, the two-platen injection molding machine can Provide products with h...

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

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