Bottom gating system and paving method thereof

Abstract

The invention discloses a bottom gating system. The bottom gating system comprises a straight pouring gate, a transverse pouring gate and an inner pouring gate, wherein the inlet end of the straight pouring gate is connected with the outlet end of the transverse pouring gate through a first T-shaped pouring gate. The first T-shaped pouring gate adopted by the bottom gating system is similar to a conventional three-way porcelain tube; one transverse end is sealed by a metal plugging plate; the function of the metal plugging plate is characterized in that a first strand of molten steel mixed with a large quantity of impurities enters the T-shaped porcelain tube and can be quickly chilled and coagulated to form a shell when being in contact with the metal plugging plate, so that the impurities are fixed to one side with the metal plugging plate of the T-shaped pouring gate, thereby ensuring that the subsequent clean molten steel is incapable of carrying the impurities into the cavity during flowing; the defects of low quality of the first strand of molten steel and the impurities generated by flushing of the molten steel in the gating system can be effectively solved; the purity of the molten steel flowing into the cavity is ensured, so that the quality of castings is improved. The invention also provides a paving method of the bottom gating system.

Description

technical field [0001] The invention relates to the technical field of pouring systems for steel casting products, in particular to a bottom pouring pouring system and a laying method thereof. Background technique [0002] At present, large and medium-sized steel castings basically use the bottom pouring system to pour the product. The bottom pouring system is a pouring system in which molten metal flows from the bottom of the casting into the cavity of the mold. This method fills the mold smoothly. The impact force on the sand core is small, and the molten metal is less oxidized. It is especially suitable for the production of large and medium-sized steel castings, and can significantly improve the quality of casting products. [0003] This method has been used for a long time in the production of steel castings, and the application technology is very mature. However, this method also has certain defects. The main performance is that in the bottom casting system, the molten...

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Problems solved by technology

[0003] This method has been used for a long time in the production of steel castings, and the application technology is very mature. However, this method also has certain defects. The main performance is that in the bottom casting system, the molten steel will flow out from the sliding nozzle at the bottom of the ladle. Mixed with some residual drainage sand and oxide slag produced at the nozzle, these impurities will follow the first molten steel into the pouring system, and finally flow into the cavity, thus affecting the quality of some castings with complex structures that are not easy to scum, especially some ribs For steel castings with many plates and grooves, due to the poor fluidity of molten steel, impurities are not easy to float up, causing these impurities to all adhere to these small and critical parts, subsequent processing is difficult, and it is easy to cause the casting to be scrapped as a whole

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