S-shaped spoke plate track wheel blank cast and casting method thereof

Abstract

The invention relates to casting of an S-shaped spoke plate track wheel blank, in particular to an S-shaped spoke plate track wheel blank cast and a casting method thereof. By the high-quality S-shaped spoke plate track wheel blank cast and the casting method thereof, a sand mould and a dead head is unneeded for casting. The cast comprises two independently moving pressing heads including a rim pressing head and a lower pressing head, and the rim pressing head belongs to a top mould and is capable of moving vertically relative to a spoke plate top mould and a shaft hole core. Wheel molten steel achieves mould filling under the action of the lower pressing head and then is subjected to feeding, plastic deformation and solidification at the positions of a hub and a rim under the high pressure action of the lower pressing head and the rim pressing head respectively, and other portions of a wheel are solidified under the pressure. A lower mould liner is mounted on the inner surface of a lower mould sleeve, a cooling duct is arranged on the boundary, and circulating cooling liquid is fed for forced cooling when a tread is solidified, so that tread structure is refined. An interior liner is mounted on a central hole step of a pressing chamber wall so as to protect the pressing chamber wall. The obtained wheel is compact in structure, and process yield can reach 90%.

Description

technical field [0001] The invention relates to a casting mold of an S-shaped spoke plate rail wheel blank and a casting method thereof, which are suitable for casting various specifications of integral rail wheel blanks. Background technique [0002] Rail wheels are an important part of rail transit locomotives. Each car needs 8 to 12 pieces, and the market demand is large. Rail wheels are a large category of products including train wheels, city rail wheels, subway wheels and truck wheels, and their structure mainly includes hubs, spokes, rims, rims, and treads. The webs have various forms, such as straight webs, inclined webs and S-shaped webs. Among them, the S-shaped webs have a good stress state, and have a significant lightweight effect, and their usage is the largest. S-shaped spoked rail wheels require treads with high wear resistance and good resistance to fatigue spalling, and require good strength, toughness and plasticity of the spokes and hub parts. Therefore...

AI Technical Summary

Problems solved by technology

[0006] However, these methods of casting rail wheels all require the use of feeding risers, which must be cut off after forming, resulting in a process yield of only 55-70%.

In this way, it is a waste of materials and time-consuming

In addition, the pressure of the molten steel in the mold cavity is very low, it is difficult to achieve the effect of forced feeding and densification, and the density of the wheel is low

Furthermore, due to the use of sand cores, it is easy to cause sand hole defects and the workpiece is scrapped, and the wall thickness of the S-shaped web is significantly smaller than that of the rim and hub, making filling and feeding difficult

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