Electroslag fusion casting manufacture method of rotating wheel blanks of impact type hydraulic generator

A hydroelectric generator, electroslag casting technology, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of high manufacturing cost of runners, material utilization rate of less than 50%, large amount of forging processing, etc., to achieve processing The effect of short cycle time, high runner output, and compact casting structure

Active Publication Date: 2012-10-31
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

But there are big problems in this process in actual production. Firstly, the processing amount of forgings is large, and the material utilization rate is less than 50%. Secondly, for the production of large impact runners, due to the large wheel diameter, the required forging Generally, a large forging press of tens of thousands of tons is required to produce it, which makes the manufacturing cost of the runner extremely high

Method used

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  • Electroslag fusion casting manufacture method of rotating wheel blanks of impact type hydraulic generator
  • Electroslag fusion casting manufacture method of rotating wheel blanks of impact type hydraulic generator
  • Electroslag fusion casting manufacture method of rotating wheel blanks of impact type hydraulic generator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] The low alloy steel 20SiMn was used to prepare the electroslag casting blank of the impact runner.

[0074] 1) Slag-based ingredients: CaF 2 70%, Al 2 o 3 30%, the amount of slag is 3% of the weight of the casting.

[0075] 2) Ignition method: The consumable electrode is ignited by solid slag in the crystallizer, and its chemical composition is TiO in weight percentage 2 : 50%, CaF 2 : 50%.

[0076] 3) Selection of crystallizer: Copper-steel composite crystallizer is adopted, and its structure adopts integral type.

[0077] 4) Power parameters: According to the size of the casting, the geometry of the electrode and the crystallizer, the casting voltage is 50V and the current is 6500A.

[0078] Through the electroslag casting process, the 20SiMn steel impact runner blank is formed by a crystallizer with a set shape. Its chemical composition is:

[0079] C

[0080] In order to eliminate the internal stress of castings and develop the potential of mec...

Embodiment 2

[0086] The blank of 06Cr13Ni4Mo steel impact runner was prepared by electroslag casting.

[0087] 1) Slag-based ingredients: CaF 2 55wt%, Al 2 o 3 45wt%, the amount of slag is 3.4% of the casting weight.

[0088] 2) Ignition method: The consumable electrode is ignited by solid slag in the crystallizer, and its chemical composition is TiO in weight percentage 2 : 50%, CaF 2 : 50%.

[0089] 3) Selection of crystallizer: Copper-steel composite crystallizer is adopted, and its structure adopts block combination type.

[0090] 4) Power parameters: According to the size of the casting, the geometry of the electrode and the crystallizer, the casting voltage is 75V and the current is 12000A.

[0091] Through the electroslag casting process, the 06Cr13Ni4Mo steel impact runner blank is formed by a crystallizer with a set shape. Its chemical composition is:

[0092]

[0093] In order to eliminate the internal stress of castings and develop the potential of mechanical proper...

Embodiment 3

[0098] The blank of 06Cr13Ni5Mo steel impact runner was prepared by electroslag casting.

[0099] 1) Slag-based ingredients: CaF 2 65wt%, Al 2 o 3 35wt%, the amount of slag is 2.5% of the casting weight.

[0100] 2) Ignition method: The consumable electrode is ignited by solid slag in the crystallizer, and its chemical composition is TiO in weight percentage 2 : 45%, CaF 2 : 55%.

[0101] 3) Selection of crystallizer: Copper-steel composite crystallizer is adopted, and its structure adopts block combination type.

[0102] 4) Power parameters: According to the size of the casting, the geometry of the electrodes and the crystallizer, the casting voltage is 50V and the current is 7500A.

[0103] Through the electroslag casting process, the 06Cr13Ni5Mo steel impact runner blank is formed by a crystallizer with a set shape. Its chemical composition is:

[0104]

[0105] In order to eliminate the internal stress of castings and develop the potential of mechanical proper...

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Abstract

The invention relates to the manufacture field of impact type rotating wheels, and in particular relates to an electroslag fusion casting manufacture method of rotating wheel blanks of an impact type hydraulic generator. The electroslag fusion casting manufacture method is an electroslag fusion casting technology for impact type rotating wheel integral casting blanks and individual rotating wheel water tank blanks. According to the method, self-consumable electrodes and the electroslag fusion casting technology are adopted; the rotating wheel integral casting blanks are produced by rotating wheel integral casting circular type blank crystallizers under an integral structure or an individual combined structure; and the individual rotating wheel water tank blanks are produced by rotating wheels water tank crystallizers under the integral structure or the individual combined structure. With the adoption of the method, the shortcomings of the current production technology of high water head impact type rotating wheel blanks can be solved; the near net forming impact type rotating wheel integral casting blank manufacture technology and the individual rotating wheel water tank blank manufacture technology are adopted; the produced rotating wheel blanks and the water tank blanks are high in fatigue resistance, high in crack generation and expansion resistance, long in service lives and high in use safety; and the quality and performance of the produced rotating wheel blanks and the water tank blanks are in line with those of forged blanks obtained by using the same materials; and the method has the advantages of low production cost, short production period and the like.

Description

technical field [0001] The present invention relates to the manufacturing field of impact type runners, in particular to an electroslag casting manufacturing method of impact type hydraulic generator runner blanks, which is a process for producing hydraulic generator runner iron alloy blanks by electroslag melting, especially The electroslag casting process of the whole casting blank of the impact runner and the blank of the split runner water bucket. Background technique [0002] With the state's emphasis on the adjustment of the power construction structure and environmental protection, the active development of hydropower has become the guiding principle for the construction of my country's electric power industry. Hydropower is a renewable and clean energy, which is beneficial to environmental protection. The development of hydropower and the improvement of the design, manufacturing and production capacity of large-scale high-head impact water turbines are the needs of p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D23/10C21D1/28C21D9/00
Inventor 徐超胡浩于川李广俊张正纬
Owner 沈阳市盛华特种铸造有限公司
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