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Method for founding main regulation valve body of steam turbine

A steam turbine and regulating valve technology, applied in casting equipment, casting molding equipment, casting molds, etc., can solve the problems of difficult cleaning of inner cavity core sand, poor feeding conditions, and difficult mass production, etc.

Inactive Publication Date: 2007-12-05
JIANGSU LEADER PRECISION MACHINERY
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] The disadvantages of the above method are: when placed horizontally, the size of the riser is large, the number of risers is large, the feeding conditions are poor, the surface of the produced casting is seriously stuck to sand, and the core sand in the inner cavity is easily sintered by molten steel and is difficult to clean; Normalizing castings, its mechanical properties should not be guaranteed
In view of this, it is not easy to form mass production

Method used

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  • Method for founding main regulation valve body of steam turbine

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Embodiment Construction

[0025] The casting method of the main steam regulating valve body of the steam turbine adopts the process of horizontal casting and vertical casting and two-stage heat treatment:

[0026] 1. Flat pouring:

[0027] a) Flat casting: place the mold flat, cover the surface of the mold with magnesia carbon sand of 50-100mm as the surface layer, and fill the rest of the back sand; place a spacer of 10-30mm at an interval of 50-100mm on the flange part (end face and circumference) Sand cold iron sand barrier layer 1; blow carbon dioxide gas to harden the mold, take out the mold, put the mold in a drying kiln at 150-300°C for 12-16 hours, and paint the zircon powder water-based paint after leaving the kiln ;

[0028] b) Vertical pouring: After assembling and tightening several parts of the mold, stand it up for pouring. There are several layers (generally three to four layers or depending on the specific situation) on both sides from bottom to top. Gate 2 , a riser 3 made of insulat...

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Abstract

The present invention is process of casting valve body of main steam regulating valve for steam turbine and belongs to the field of metal casting technology. The casting process includes one vertical casting step and two steps of heat treatment to eliminate shrinkage faults. The casting process can produce casting of valve body with high mechanical performance.

Description

technical field [0001] The invention belongs to the field of metal casting, in particular to a casting method for a main steam regulating valve body on a steam turbine. Background technique [0002] The main steam regulating valve body is a key part of the steam turbine, and it is very difficult to produce. In the past, it has been relying on foreign production. Some domestic manufacturers have tried production, but have not formed mass production. The casting method is as follows: [0003] 1. Adopt the horizontal pouring process. The valve body is placed horizontally, the pouring system is set on both sides, and 3 risers are set on the upper part of the flange to supplement the molten steel. [0004] 2. Place cold iron on the flange to enhance cooling, and use raw sand with high refractoriness for the molding sand on the outer layer of the valve body and the core sand in the inner cavity. [0005] 3. Heat treatment is generally cooling in air. [0006] The disadvantages ...

Claims

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Application Information

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IPC IPC(8): B22D46/00B22C9/02
Inventor 陆乾吴正江徐军
Owner JIANGSU LEADER PRECISION MACHINERY
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