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Electroslag fusion casting manufacturing method for annular plate of hydraulic generator

A hydro-generator and electroslag casting technology, applied in the field of electroslag casting manufacturing, can solve the problems of inability to produce similar steel plates with high yield strength, increased use costs, steel waste, etc., and achieve excellent laminar tear resistance, cooling The effect of fast speed and reduced cutting volume

Active Publication Date: 2014-04-16
沈阳市盛华特种铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The control and processing technology of its lamellar tear-resistant alloy components and impurity components are still unable to produce similar steel plates with large yield strength in China, especially large-thickness steel plates. It is precisely because of this technical bottleneck that the use of this special steel plate in China is restricted. Great constraints
At the same time, because the special rolled steel plates are all square thick plates, they are cut into ring sectors according to the required size during use, which also causes a large amount of steel waste and further increases the cost of use

Method used

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  • Electroslag fusion casting manufacturing method for annular plate of hydraulic generator
  • Electroslag fusion casting manufacturing method for annular plate of hydraulic generator
  • Electroslag fusion casting manufacturing method for annular plate of hydraulic generator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Slag ingredients are used: CaF 2 70%, Al 2 O 3 30%. The amount of slag was 3% by weight of the casting.

[0029] 2. Ignition method: the consumable electrode is ignited by solid slag in the mold, TiO 2 : 50%, CaF 2 : 50%.

[0030] 3. Selection of crystallizer: The copper-steel combined crystallizer is used, and its structure adopts the outer arc side as the gradually closed cooling surface ( figure 1 ).

[0031] 4. Electrical parameters: According to the casting size, electrode and mold geometry, the casting voltage is 55V, and the current is 6500A.

[0032] Through the electroslag casting process, the ring plate is formed by the mold of the set shape. Its chemical composition is.

[0033]

[0034] The mechanical properties of the casting after heat treatment are:

[0035]

Embodiment 2

[0037] 1. Slag ingredients are used: CaF 2 70%, Al 2 O 3 30%. The amount of slag was 3.4% by weight of the casting.

[0038] 2. Ignition method: the consumable electrode is ignited by solid slag in the mold, TiO 2 : 50%, CaF 2 : 50%.

[0039] 3. Selection of crystallizer: All-copper crystallizer is used, and its structure adopts the block-combined outer arc side as the gradually closed cooling surface.

[0040] 4. Electrical parameters: According to the casting size, electrode and mold geometry, the casting voltage is 75V, and the current is 12000A.

[0041] Through the electroslag casting process, it is formed by a mold with a set shape. Its chemical composition is.

[0042]

[0043] The mechanical properties of the casting after heat treatment are:

[0044]

Embodiment 3

[0046] 1. Slag ingredients are used: CaF 2 70%, Al 2 O 3 30%. The amount of slag was 2.5% by weight of the casting.

[0047] 2. Ignition method: the consumable electrode is ignited by solid slag in the mold, TiO 2 : 45%, CaF 2 : 55%.

[0048] 3. Selection of crystallizer: All-steel crystallizer is adopted, and its structure adopts one side of the outer arc to gradually close the cooling surface.

[0049] 4. Electrical parameters: According to the casting size, electrode and mold geometry, the casting voltage is 50V, and the current is 7500A.

[0050] Through the electroslag casting process, the ring plate is formed by the mold of the set shape. Its chemical composition is.

[0051]

[0052] The mechanical properties of the casting after heat treatment are:

[0053]

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Abstract

The invention discloses an electroslag fusion casting manufacturing method for an annular plate of a hydraulic generator. The method is characterized by comprising the following steps of: 1) controlling slag systems and slag amount; 2) igniting; 3) selecting a crystallizer; 4) rotating the crystallizer by using a control system; 5) selecting power supply parameters; 6) controlling casting alloy components after fusion casting; and 7) selecting a casting thermal processing process. A near-net-shape forming annular plate manufacturing technology is provided for producing annular anti-tear steel plates for hydraulic generator seat rings, top covers and bottom rings at present; a rotatable crystallizer is used for electroslag fusion casting formation, so that technical requirements on production of the annular plate are met; and the produced annular plate has high laminated tearing resistance, higher fatigue resistance and higher crack generation and expansion resistance, and the quality and the performance of the annular plate are not lower than those of a specially-forged product which is made of the same material as that of the annular plate.

Description

technical field [0001] The invention relates to a process for producing a special anti-layered tearing steel plate, in particular to an electroslag casting manufacturing method specially used for producing ring plates for hydraulic generators by using electroslag casting technology. Background technique [0002] With the country's emphasis on the adjustment of power construction structure and environmental protection, the active development of hydropower has become the guiding principle of my country's power industry construction. Hydropower is a renewable and clean energy source, which is beneficial to environmental protection, development of hydropower, and improvement of the design, manufacture and production capacity of large-scale high-head turbine units. [0003] In the turbine, the volute seat ring, top cover and bottom ring are important parts, and the structure must have sufficient strength and rigidity. Due to the use of trapezoidal welding during use, there are h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D23/10
Inventor 徐超胡浩于川李广俊张政纬
Owner 沈阳市盛华特种铸造有限公司
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