Mixture, riser bush made of same and preparation method of riser bush

Abstract

The invention relates to the technical field of auxiliary materials of casting, in particular to a mixture, a riser bush made of the same and a preparation method of the riser bush. The riser bush is prepared through mixing, compression molding and drying and with the following raw materials including, by weight percentage, 19% to 23% of aluminum powder, 8% to 12% of ferric oxide, 8% to 10% of graphite, 17% to 35% of cenospheres, 2% to 4% of cryolite, 20% to 28% of tail slag, 2% to 4% of potassium chlorate, 2% to 3% of potassium nitrate, and binders of the required amount and water of the required amount, wherein the aluminum powder and the ferric oxide serve as the auxiliary exothermic materials, the cenospheres serve as the thermal insulation materials, the cryolite serves as the fluxing agent, the tail slag serves as the aggregate, and potassium chlorate and potassium nitrate serve as the oxidizing agents. Because the riser bush obtained with the formula is low in ignition temperature, ideal in ignition time and long in burning time, and provides sufficient heat, the riser bush is long in begin time of solidification, and has the good feeding effect, and the product quality of steel castings is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of casting auxiliary materials, and in particular relates to a low-cost mixed material with the function of heating and heat preservation in the casting of steel castings, a riser sleeve made from the mixture and a method for preparing the riser sleeve. Background technique [0002] The riser is a supplementary part added to the top or side of the casting to avoid defects in the casting. The cavity of the riser is a cavity for storing liquid metal. When the casting is formed, the metal is supplied to prevent shrinkage, shrinkage, and exhaust. and the role of slag collection. Riser sleeves with different functions have different shapes, sizes and opening positions. The traditional riser feeding technology for steel castings uses ordinary sand risers, which are directly formed by molds. Due to the lack of insulation materials, the risers dissipate a lot of heat from the inside to the outside during the feedin...

AI Technical Summary

Problems solved by technology

Some people have found that the actual effective feeding molten steel of common sand mold risers accounts for a very small proportion of the total riser volume, about 6-14%. Therefore, larger risers are often used to meet the feeding of castings. Even so, the riser The liquid metal in the mouth itself solidifies quickly, and sometimes it cannot be fed in time to affect the internal quality of the casting

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