Solidification and feeding method for complicated annular thin-wall shell steel casting

Abstract

The invention discloses a solidification and feeding method for a complicated annular thin-wall shell steel casting. By means of the solidification and feeding method, the problem that in the casting process of existing complicated annular thin-wall steel castings, shrinkage porosity, shrinkage cavities and crack defects are prone to occur is resolved. The solidification and feeding method comprises the following steps that a, steel casting sand mold cavity is made; b, annular transverse runners and a straight runner are made on the steel casting sand mold cavity, slag collecting cylinders are arranged on the upper surfaces of the annular transverse runners, gap inner runners are arranged between the slag collecting cylinders and the outer wall of the steel casting sand mold cavity, a feeding auxiliary sprue and top risers are arranged on the upper portion of the steel casting sand mold cavity, and a gap auxiliary runner is arranged between each top riser and the feeding auxiliary sprue; c, during pouring, the film forming pouring temperature of molten metal is 1500 DEG C-1520 DEG C; and d, when the molten metal level reaches the upper portions of the top risers, melt metal pouring is stopped on the straight runner, and the molten metal enters the steel casting sand mold cavity through the feeding auxiliary sprue until pouring is completed. The whole mold filling process is stable, no disturbance exists, and the phenomena of pores and dreg inclusion defects are avoided.

Description

technical field [0001] The invention relates to a casting method for steel castings requiring X-ray flaw detection, in particular to a solidification and feeding method for steel castings with complex annular thin-wall shells. Background technique [0002] The production of complex annular thin-walled steel castings is a difficult type of casting products. Due to the characteristics of alloys and structural features, it is difficult to control the quality of castings during the forming process, which is mainly reflected in the following two aspects: [0003] 1. Thin-walled and uniform-thickness parts of complex thin-walled shell castings are prone to shrinkage defects. [0004] The pouring temperature of steel castings is high, and it is an alloy with large volume shrinkage. Generally, the process design principle of sequential solidification is adopted. In the process of controlling the solidification of ordinary steel castings, most of them adopt the process of feeder fee...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that shrinkage porosity, shrinkage cavities and crack defects exist easily in the casting of existing complex annular thin-walled steel castings, the present invention provides a solidification feeding method for complex annular thin-walled shell steel castings

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