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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: 2012-04-18
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 system ingredients use: CaF 2 70%, Al 2 O 3 30%. The amount of slag is 3% of the weight of the casting.

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

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

[0031] 4. Electricity parameters: According to the size of the casting, the geometry of the electrode and the mold, 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 castings after heat treatment are as follows.

[0035]

Embodiment 2

[0037] 1. Slag system ingredients use: CaF 2 70%, Al 2 O 3 30%. The amount of slag is 3.4% of the casting weight.

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

[0039] 3. The choice of the crystallizer: the all-copper crystallizer is adopted, and its structure adopts the block-combined outer arc side as the gradually closed cooling surface.

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

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

[0042]

[0043] The mechanical properties of the castings after heat treatment are as follows.

[0044]

Embodiment 3

[0046] 1. Slag system ingredients use: CaF 2 70%, Al 2 O 3 30%. The amount of slag is 2.5% of the weight of the casting.

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

[0048] 3. Selection of mold: All-steel mold is adopted, and its structure adopts a gradually closed cooling surface on the outer arc side.

[0049] 4. Electricity parameters: According to the size of the casting, the geometry of the electrode and the mold, 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 castings after heat treatment are as follows.

[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 that uses electroslag casting technology to produce ring plates for hydroelectric generators. Background technique [0002] As the country attaches great importance to 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 clean energy source, which is conducive to environmental protection. The development of hydropower and the improvement of the design, manufacturing and production capacity of large-scale high-head water turbine units are the requirements for promoting the development of the national economy and the development of the machinery industry. [0003] In a hydraulic turbine, the volute seat ring, top cover and bottom ring are important...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D23/10
Inventor 徐超
Owner 沈阳市盛华特种铸造有限公司
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