Manufacturing method for through-flow turbine continuous variable cross-section movable guide vanes through electroslag smelting casting

A tubular water turbine, electroslag casting technology, applied in the field of high requirements, electroslag casting tubular water turbine continuous variable cross-section movable guide vane, high-performance tubular water turbine movable guide vane manufacturing process, can solve the problem Unable to produce continuously changing cross-section castings and other problems, to achieve the effects of good fatigue resistance and crack extension, improved utilization rate, and high purity

Active Publication Date: 2014-02-12
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

[0005] The purpose of the present invention is to provide a method for manufacturing continuous variable section (fan-shaped) movable guide vanes of electroslag casting tubular water turbines, so as to solve the technical problem that the current electroslag casting technology cannot produce continuously variable section castings

Method used

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  • Manufacturing method for through-flow turbine continuous variable cross-section movable guide vanes through electroslag smelting casting
  • Manufacturing method for through-flow turbine continuous variable cross-section movable guide vanes through electroslag smelting casting
  • Manufacturing method for through-flow turbine continuous variable cross-section movable guide vanes through electroslag smelting casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] The electroslag casting blank of guide vane of tubular hydroelectric generator was prepared by low alloy steel 20SiMn.

[0083] Power parameters: According to the size of the casting, the geometry of the electrode and the crystallizer, the initial casting voltage is 50V, and the current is 6500A. The casting process is adjusted according to the calculation formula.

[0084] Through the electroslag casting process, the 20SiMn steel blank is formed by a crystallizer with a set shape. Its chemical composition is:

[0085] Table 4

[0086] C Si mn P S Cr Ni Cu Fe 0.20 0.7 1.20 0.020 0.013 0.010 0.10 0.10 margin

[0087] In order to eliminate the internal stress of castings and develop the potential of mechanical properties of materials, timely heat treatment is required, using anti-cracking heat treatment + normalizing + tempering process, and adopting other heat treatments according to actual performance and process requirements to...

Embodiment 2

[0092] The guide vane blank of 06Cr13Ni4Mo steel tubular hydro-generator was prepared by electroslag melting.

[0093] Power consumption parameters: According to the size of the casting, the geometry of the electrode and the crystallizer, the initial casting voltage is 75V, and the current is 12000A. The casting process is adjusted according to the voltage and current formula.

[0094] Through the electroslag casting process, the 06Cr13Ni4Mo steel blank is formed by a crystallizer with a set shape. Its chemical composition is:

[0095]

[0096] In order to eliminate the internal stress of castings and develop the potential of mechanical properties of materials, timely heat treatment is required, using anti-cracking heat treatment + normalizing + tempering process, and adopting other heat treatments according to actual performance and process requirements to optimize the comprehensive performance of castings.

[0097] In this embodiment, the thermal cracking prevention and ...

Embodiment 3

[0101] The guide vane blank of 06Cr13Ni5Mo steel tubular hydro-generator was prepared by electroslag melting.

[0102] Power consumption parameters: According to the size of the casting, the geometry of the electrode and the crystallizer, the initial casting voltage is 50V, and the current is 7500A. The casting process is adjusted according to the voltage and current formula.

[0103] Through the electroslag casting process, the 06Cr13Ni5Mo steel 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 properties of materials, timely heat treatment is required, using anti-cracking heat treatment + normalizing + tempering process, and adopting other heat treatments according to actual performance and process requirements to optimize the comprehensive performance of castings.

[0106] In this embodiment, the thermal cracking prevention and i...

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Abstract

The invention relates to a smelting casting type manufacturing method for through-flow turbine guide vanes, in particular to a manufacturing process for high-requirement and high-performance through-flow turbine moveable guide vanes, and particularly discloses an manufacturing method for through-flow turbine continuous variable cross-section (fan-shaped) movable guide vanes through electroslag smelting casting, which can solve the technical problem that continuous variable cross-section castings cannot be produced by adopting the existing electroslag smelting casting. In order to solve the technical problem, the invention provides an electroslag smelting casting process design method and a manufacturing method for continuous variable cross-section castings, and an electroslag smelting casting process method for a through-flow hydrogenerator moveable guide vane, the cross section of the guide vane produced by adopting the electroslag smelting casting technology is continuously variable during the smelting casting process . The performance index of the moveable guide vane of the through-flow hydrogenerator, produced by the electroslag smelting casting technology is greatly improved as compared with that of the guide vane produced by the current manufacturing method. The through-flow hydrogenerator moveable guide vane is produced by the electroslag smelting casting technology instead of sand mould casting, so the utilization ratio of materials is increased by more than 20%.

Description

Technical field: [0001] The invention relates to a method for manufacturing guide vanes of tubular water turbines, in particular to a manufacturing process for movable guide vanes of tubular water turbines with high requirements and high performance, specifically a continuously variable section (fan-shaped) electroslag casting tubular water turbines A method of manufacturing movable guide vanes. Background technique: [0002] With the country's structural adjustment of electric power construction and emphasis on environmental protection, actively developing hydropower has become the development direction of my country's electric power industry. Hydropower is a renewable and clean energy. The development of hydropower and the improvement of the design, manufacturing and production capacity of large-scale water turbines are the needs of promoting the development of the national economy and the development of the machinery industry. With the continuous improvement of the perfo...

Claims

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Application Information

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