A sand mold structure of a steam turbine tile casting

Abstract

The invention relates to a sand mould structure of a tile edging casting of a steam turbine in the technical field of casting. The sand mould structure comprises a left sand mould and a right sand mould; the left sand mould and the right sand mould each form an independent tile edging casting cavity outer contour, and are each internally provided with a sand core forming a tile edging casting cavity inner contour; a straight-line-shaped feeding and pasting structure which is communicated with a left cavity and a right cavity and used for forming pouring feeding is formed between opposite sides between the left sand mould and the right sand mould; the upper side of the feeding and pasting structure is provided with a commonly-used side riser in a communicated manner; and the lower side of the feeding and pasting structure is communicated with an inner pouring gate of a bottom pouring type pouring system; and according to the sand mould structure, a double-mould structure of one-mould two-piece simultaneous casting is adopted, an open riser is changed into the side riser, heat influences of oil tanks of the tile edging face can be reduced, oil tank sand burning can be prevented, meanwhile, the feeding and pasting of the side face of the casting and the structure of the side riser can facilitate cutting after pouring, and the casting yield rate is improved.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a sand mold structure of a steam turbine tile casting. Background technique [0002] The structure of a steam turbine tile casting is as follows figure 1 — image 3 As shown, the maximum outline size of the casting is 625×460×1025mm, and the average wall thickness is 45mm. There are three oil grooves 1 on the tile surface of the casting, and the three oil grooves are arranged in a triangular shape, and the two oil grooves on both sides are symmetrically distributed along the center plane of the casting. , the third oil groove is located in the middle directly above the other two oil grooves. The width of the oil groove is 40mm, the length is 300mm, and the maximum depth is 200mm. There is an oil hole 2 on the back of the casting tile corresponding to each oil groove, and the middle oil hole The diameter is 66mm, which is more protruding from the surface of the casting than the...

AI Technical Summary

Problems solved by technology

When using this casting molding method for casting, due to the feeding of the open riser, the tile surface is often overheated, and the heat cannot be dissipated, resulting in sand sticking in the oil tank

The three oil grooves in the inner cavity of the casting are independently made of core boxes according to their shapes and sizes, and three independent sand cores are molded. Each sand core has only one core head, which makes it difficult to accurately control the positioning size of the sand core, and it is easy to deviate during the pouring process. shift, and in actual production, the oil hole of the casting is also easy to stick sand

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