Manufacture Process of Guide Vane of Large Water Turbine

Abstract

The invention relates to a process for manufacturing a large-sized water turbine guide vane. The process can reduce the manufacturing cost of the large-sized water turbine guide vane and improve the quality of the water turbine guide vane. According to the guide vane manufactured through the process, a long shaft, a short shaft and a petal body are all castings, wherein the petal body is of a hollow structure, and all parts except the body of the long shaft are made of stainless steel materials. Three petal body sections are assembled with the long shaft respectively and are then assembled with the short shaft, and angle adjustment can be carried out in the general assembly process to compensate for welding deformation caused in the sub-assembly welding process. Due to the plasticity, toughness and cold crack resistance of the austenitic stainless steel materials, the problem that the root portion of a welding groove cracks and is difficult to repair is solved, the structural and mechanical property of weld joints is improved, and the quality of the weld joints is guaranteed.

Description

Technical field: [0001] The invention relates to a manufacturing process of guide vanes of large water turbines. Background technique: [0002] For large turbine guide vanes, hollow welded guide vanes can reduce weight and material costs compared with solid cast guide vanes, and the economic benefits are considerable. At present, the steel plate welding structure guide vane is used. The petal body is made of steel plate, and the long and short axes are castings. The petal body steel plate is formed by several pieces separately, and the blank of the turbine guide vane is manufactured by welding, and then the size of the drawing is achieved by mechanical processing. Finished guide vanes to tolerance requirements. The bending forming of the petal body steel plate of the movable guide vane with this structure requires high equipment capacity, and the forming accuracy is poor, which affects the overall assembly accuracy of the movable guide vane. Moreover, during welding, the s...

AI Technical Summary

Problems solved by technology

The bending forming of the petal body steel plate of the movable guide vane with this structure requires high equipment capacity, and the forming accuracy is poor, which affects the overall assembly accuracy of the movable guide vane

Moreover, during welding, the steel plate petal body is prone to deformation, resulting in insufficient machining allowance of the movable guide vane petal body or thinning of the steel plate, thereby reducing the quality and stability of the movable guide vane

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