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Casting method of high-pressure main air valve cat part of steam turbine

A technology of steam turbine and main air valve, applied in casting molding equipment, casting mold, casting mold composition, etc., can solve the problems of increasing RT inspection cost in welding area, prolonging post-processing cycle, increasing molding and pouring operation volume, etc. The effect of shortening the casting process cost, eliminating the welding process and reducing the modeling workload

Active Publication Date: 2017-08-15
KOCEL STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing casting method of this casting is to mold and pour the casting flange 2 and the casting main body 1 respectively, and then obtain a complete casting by welding and assembling. And the amount of pouring operation, but also increases the cost of RT detection in the welding area, and prolongs the post-processing cycle

Method used

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  • Casting method of high-pressure main air valve cat part of steam turbine
  • Casting method of high-pressure main air valve cat part of steam turbine
  • Casting method of high-pressure main air valve cat part of steam turbine

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Embodiment Construction

[0020] The casting method of steam turbine high-pressure main gas valve casting of the present invention is described in detail below in conjunction with accompanying drawing, specifically comprises following process:

[0021] 1) Determination of casting modeling scheme: if figure 2 The flange 2 of the casting is integrally molded with the main body 1 of the casting, and the upper box 4 and the lower box 5 are molded with the plane where the central axis of the casting main body 1 and the central axis of the flange 2 are located as the parting plane;

[0022] 2) Riser and cold iron design: such as image 3 In the upper box, riser 1 6A is set above the flange 2 of the casting, several riser 2 6B are set above the hot joint of the casting body 1, and subsidies are provided between each riser and the casting to ensure the feeding channel In the upper box 4 and the lower box 5, the circumferential area where the flange 2 of the casting is connected with the main body 1 of the ca...

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Abstract

The invention relates to the technical field of casting, in particular to a casting method of a high-pressure main air valve cat part of a steam turbine. The casting method is technologically improved from the four aspects of the cast part molding scheme determination, dead head and chiller design, sand core structure design and gating system design, a flange and a cast part body are cast as a whole, a steel rod serves as an internal chiller in the position of the flange of the cast part, the defects of flange internal diameter sand sticking and clamping are overcome, and meanwhile, the chilling action of the steel rod guarantees the compact structure of a key area. In the casting method, only an upper box and a lower box are needed, the molding workload is reduced, the subsequent welding procedures are omitted, the production period is shortened, and the casting process cost is reduced.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a casting method of a high-pressure main gas valve casting of a steam turbine. Background technique [0002] The casting structure of high-pressure main steam valve of steam turbine is as follows: figure 1 As shown, its structure is complicated, there are many nozzles, and the modeling is difficult. Its specific structure includes casting body 1 and flange 2. There are several protruding umbilicus on the outer surface of the casting body. The inner cavity of the casting is small, and the minimum inner diameter is only 200mm. The casting is difficult and requires high quality. The existing casting method of this casting is to mold and pour the casting flange 2 and the casting main body 1 respectively, and then obtain a complete casting by welding and assembling. And the amount of pouring operation, but also increases the cost of RT detection in the welding area, and prolongs th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/22B22C9/08B22C9/10B22D27/04
CPCB22C9/082B22C9/088B22C9/10B22C9/22B22D27/04
Inventor 彭凡郭小强程亚军
Owner KOCEL STEEL
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