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Turbine runner three-dimensional curved surface blade electroslag smelting casting direct forming method

A technology of electroslag casting and three-dimensional curved surface, which is applied in the field of electroslag casting to produce turbine runner blade castings. It can solve the problems of inability to cast complex special-shaped parts, achieve high resistance to crack formation and expansion, reduce pollution, and have high dimensional accuracy. Effect

Active Publication Date: 2018-04-06
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

[0007] The purpose of the present invention is to provide a method for direct molding of three-dimensional curved blades of a water turbine by electroslag melting, which mainly solves the problem that the electroslag casting process cannot melt and cast complex special-shaped parts, that is, the casting crystallizer does not have a common cavity casting for the movable supplementary electrode

Method used

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  • Turbine runner three-dimensional curved surface blade electroslag smelting casting direct forming method
  • Turbine runner three-dimensional curved surface blade electroslag smelting casting direct forming method
  • Turbine runner three-dimensional curved surface blade electroslag smelting casting direct forming method

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Effect test

Embodiment 1

[0055] Such as Figure 1-Figure 2 As shown, in this embodiment, the fixed electrode 2 and the crystallizer are assembled according to the process requirements for the electroslag casting of the blank of the runner blade of the Francis hydro-generator, and the consumable electrode includes two movable electrodes 1 . The fixed electrode 2, a movable electrode 1 and the power source I7 form a power circuit A, and the other movable electrode 1, the bottom pad 6 and the power source II8 form a power circuit B. During the casting process, the power circuit B heats the slag layer 3 to obtain a liquid molten slag layer, which creates conditions for the work of the power circuit A. The power circuit A enhances the fluidity of the metal in this area and completes the casting of the complex cavity area. During the process, the self-consumable electrode is continuously consumed, and the active electrode 1 is continuously replenished until the casting is melted and casted into a solidified...

Embodiment 2

[0057] Such as Figure 1-Figure 2 As shown, in this embodiment, the electroslag casting of the blank of the runner blade of the axial flow (tubular) hydroelectric generator uses the movable electrode 1 and the fixed electrode 2 in the mold cavity 5 . Before the crystallizer assembly box, the fixed electrode 2 is fixed at the designated position of the mold cavity 5. After the movable electrode 1 is installed in place, a safe distance is kept between them, and the movable electrode 1 continuously performs self-consumption during the casting process. In addition, in a special area, the fixed electrode 2 contacts the liquid molten slag layer 3 and starts to conduct the power circuit, and the electrode starts to melt.

[0058] The results of the examples show that the present invention is a nearly net-shape integral casting blank manufacturing technology, especially an electroslag casting method for one-time forming of the runner blade of a hydroelectric generator, and the produce...

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Abstract

The invention relates to the field of electroslag smelting casting production of turbine runner blade castings, in particular to a turbine runner three-dimensional curved surface blade electroslag smelting casting direct forming method. Electroslag smelting casting is used for completing secondary refining purification and casting near net forming of consumable electrode materials. The specific process comprises the following steps that 1) the structure form of a casting blank crystallizer is of an assembled type or a split type; 2) consumable electrodes in the smelting casting process consistof two parts, namely the fixed electrodes and the movable electrodes; and 3) a power supply mode adopts an alternating current single-electrode series loop and double-electrode series loop mixed power supply mode, by means of a power loop formed between double-electrode series electrodes, the slag layer temperature of an electroslag smelting casting area is increased, the metal fluidity of the area is improved, the solidification speed of the area is controlled, and blade smelting casting forming is achieved. The technology provided by the invention is applicable to manufacturing of the castings of tubular turbine generator runner blades or mixed-flow turbine generator runner blades or axial flow turbine generator runner blades.

Description

technical field [0001] The invention relates to the field of producing water turbine runner blade castings by electroslag melting casting, in particular to a method for direct forming by electroslag melting casting of blades with three-dimensional curved surfaces of a water turbine runner. Background technique [0002] Electroslag casting, as a casting process integrating refining and forming, is currently widely used in fields with high casting quality requirements. Generally, the consumable electrode is used as the casting raw material for its melting and casting, and the consumable electrode is placed in the molten slag layer of the mold to complete the remelting process. This process needs to maintain a safe distance between the electrode and the inner cavity of the mold, which requires During the casting process, the consumable electrodes are kept in contact with the slag as the casting progresses to complete the entire casting process. [0003] For special-shaped part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D23/10
CPCB22D23/10Y02E10/20
Inventor 徐超胡浩于川张政纬佟欣彭磊
Owner 沈阳市盛华特种铸造有限公司
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