Casting Method of Steam Turbine Valve Housing Castings

Abstract

A novel casting method for a steam turbine valve shell casting comprises the following steps that solid model split parts of the steam turbine valve shell casting are manufactured, the maximum section of the steam turbine valve shell casting is selected as a parting surface, the corresponding upper valve shell casting solid model split part and the corresponding lower valve shell casting solid model split part are manufactured, and a middle pipe opening is located in the upper valve shell casting solid model split part; modeling is carried out, lower box modeling is carried out, a sand box and the lower valve shell casting solid model split part are arranged on a modeling platform, quick sand modeling is carried out, a pouring system is laid, and box overturning is carried out after placement is conducted for preset time; upper box modeling is carried out, the other sand box and the upper valve shell casting solid model split part are arranged on a lower box, quick sand modeling is carried out, and open risers are arranged on the side walls, close to the middle pipe opening, of the upper valve shell casting solid model split part and the end pipe opening, far away from the flange face, of the upper valve shell casting solid model split part; a sand core of an inner cavity of the steam turbine valve shell casting is manufactured; and after core setting, box combining, pouring, cooling and box beating, the steam turbine valve shell casting is finally obtained.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a casting method of a steam turbine valve housing casting. Background technique [0002] The casting structure of steam turbine valve casing is complex, with many nozzles and different angles, so it is difficult to shape. At the same time, the inner cavity space of the casting is narrow, and the space for setting the riser is small, which makes it difficult to feed the casting. In the prior art, the casting process of such castings is as Figure 1 to Figure 3 As shown, the flange surface 11 of the steam turbine valve casing casting solid model 10 corresponding to the steam turbine valve casing casting is horizontally upward, and is divided into a lower box 20, a middle box 21, and an upper box 22 for molding; An open riser 23 is set on the surface 11, and a dark riser 24 is set on the end of the solid model 10 of the steam turbine valve casing casting near the middle nozzle 12 a...

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Problems solved by technology

[0003] The above-mentioned casting method has the following problems: 1. Because a hidden riser is arranged in the inner cavity of the casting, it is easy to cause sand sticking in the inner cavity of the casting, and it is easy to cut the casting when cutting, and it is difficult to set the dark riser, which is not conducive to casting feeding; 2. There is no core head at the hidden riser of the 1# sand core in the inner cavity, which makes it difficult to locate the sand core and ensure the size of the casting; 3. The molding of this casting method is divided into upper, middle and lower boxes, and the actual production efficiency is low. The labor intensity of the operator is high

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