Casting and cooling system and cooling method of high-carbon steel thin-walled annular casting

Abstract

The invention relates to a casting and cooling system and a cooling method of a high-carbon steel thin-walled annular casting in the technical field of casting techniques. The casting and cooling system comprises annular cooling channels formed at the position, close to the thinnest wall, of the inner side of a thin-wall cavity of the casting at intervals, wherein each annular cooling channel is provided with an air inlet pipe and an air outlet pipe extending to the outside of a sand box, and the air inlet pipe is communicated with a compressed air source. A plurality of tiepieces connected with the cavity of the casting are arranged on the outer side of the thin-wall cavity of the casting in an adhered mode, and the length directions of the tiepieces are set in the axial direction of the annular thin wall. The cooling system is provided with the annular cooling channels formed in the inner side of the thin-wall cavity of the casting at intervals to replace chilling blocks, the thin-wall position is forcedly cooled, and the crack defect at the thin-wall position is overcome. The tiepieces are added on the outer side of the middle thin-wall position of the casting to decrease the tensile stress at the middle thin-wall position, heat at the middle thin-wall position is dissipated out through the tiepieces to enable the middle thin-wall position to quickly solidify due to the fact that the tiepieces solidify firstly, and accordingly shrinkage is prevented from being produced at the thin-wall position of the casting.

Description

technical field [0001] The invention relates to the technical field of casting technology, in particular to a pouring cooling system and cooling method for high-carbon steel thin-walled annular castings. Background technique [0002] A large thin-walled annular steel casting made of high carbon steel produced by our company, its structure is as follows figure 1 As shown, there are two thick upper flanges 1 and lower flanges 2, and an annular thin-walled part 3 in the middle. The difference between the maximum wall thickness and the minimum wall thickness of the casting is large. In addition, high-carbon steel castings have a high carbon equivalent, and the material is relatively brittle and hard, which is prone to cracks. The casting process scheme of this type of casting in the prior art is as figure 2 As shown, an open riser 4 is set on the upper flange 1, a subsidy 5 is set directly below the open riser 4, a dark riser is laid on the inner side of the lower flange 2, a...

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Problems solved by technology

[0004] The present invention aims at the defects that cracks and shrinkage are prone to occur in the casting of large thin-walled annular steel castings of the above-mentione

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