Segmented casting method for special-shaped steel casting of subway bogie

Abstract

The invention relates to a segmented casting method for a special-shaped steel casting of a subway bogie. The method comprises the following steps that the middle portion of an upper rib plate of the casting is parted up and down, and an upper mold is parted in a segmented manner around a circular boss center; a pouring system enters a cavity from the center of a lower rib plate through an ingate; risers are arranged on a machining surface at equal positions; a lower outer mold sand mold, an upper outer mold sand mold, a pouring gate sand supplementing sand core and a segmented sand supplementing sand core are manufactured by using water glass ester hardened sand; after the sand molds are closed, furnace burden is smelted into pouring molten liquid, the casting is poured, and the molten liquid comes in from the pouring system; and cooling is conducted, a box is opened for shakeout, and a casting head is cut to form a casting blank. The casting process of rib plate parallel parting is adopted, it is guaranteed that the internal quality of the whole casting is compact, the product stability is improved, the risers are arranged on the machining surface, the post-treatment workload is greatly reduced, and the working efficiency is improved; and the segmented casting process is adopted, an isolated portion of the upper mold of the casting is formed through the sand supplementing sand core, the overall height of an upper mold outer mold is reduced, the molding sand consumption is reduced, and meanwhile the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of casting technology, in particular to a segmental casting method for special-shaped steel castings of subway bogies. Background technique [0002] Casting is a method of casting liquid metal into a casting cavity adapted to the shape of the part, and then cooling and solidifying it to obtain parts or blanks. It is a widely used thermal processing process. [0003] Special-shaped steel castings are key stress-bearing parts on subway bogies. They are highly integrated special-shaped thin-walled structures with uneven wall thickness and poor self-feeding conditions for castings. If the casting process design is unreasonable, it will easily lead to poor internal quality of castings. Densification leads to scrapping of castings and economic losses. [0004] At present, similar castings mostly use the casting process of vertical rib plate splitting. Such a process can ensure the internal compactness of the thic...

AI Technical Summary

Problems solved by technology

[0003] Special-shaped steel castings are key stress-bearing parts on subway bogies. They are highly integrated special-shaped thin-walled structures with uneven wall thickness and poor self-feeding conditions for castings. If the casting process design is unreasonable, it will easily lead to poor internal quality of castings. Densification leads to scrapping of castings, resulting in economic losses

[0004] At present, similar castings mostly use the casting process of vertical rib plate splitting. Such a process can ensure the internal compactness of the thick and large parts of the casting, but it is difficult to guarantee the feeding of some thin-walled rib plates under stress, the internal quality is unstable, and the yield rate is low. In addition, a large number of risers and subsidies are set on the non-processing surface, and the risers and subsidies after cutting will bring a lot of workload to the post-processing cutting and grinding processes of castings, and the economic benefits are poor

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