Segmental Casting Method for Special-shaped Steel Castings of Subway Bogies

Abstract

The invention relates to a segmental casting method for a special-shaped steel casting of a subway bogie. The middle part of the upper rib plate of the casting is divided into upper and lower parts, and the upper type is divided into segments by the center of a circular boss; the pouring system consists of an inner runner from below The center of the rib plate enters the mold cavity; it is set on the machined surface and other positions; the sand mold of the lower outer mold, the sand mold of the upper outer mold, the sand filling sand core of the gate and the sand filling sand core of the section are made of water glass ester hardened sand; After the mould, the furnace material is smelted into a pouring melt, and the casting is poured, and the melt enters from the gating system; cooling, opening the box to shake off the sand, and cutting the pouring riser to form the casting blank. The present invention adopts the casting process of parallel splitting of the rib plate to ensure the compact internal quality of the whole casting and improve the product stability, and the riser is arranged on the machined surface, which greatly reduces the post-processing workload and improves the work efficiency; The segmental casting process forms the isolated part of the upper mold of the casting through sand filling sand cores, reduces the overall height of the upper mold, reduces the amount of molding sand, and improves production efficiency at the same time.

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...

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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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