Roll forging forming process for last stage of moving blade of 600MW unit steam turbine

Abstract

The invention discloses a roll forging forming process for a last stage of moving blade of a 600MW unit steam turbine and belongs to the technical field of blade forging. The roll forging forming process for the last stage of moving blade of the 600MW unit steam turbine comprises the following implementing stages: a stage of cogging, i.e. roll forging cogging and die forging cogging; a stage of forming roll forging and finish forging, i.e. forming roll forging, finish forging, trimming and shape calibration; and a stage of heat treatment, i.e. high temperature tempering, quenching and tempering treatment. The roll forging forming process for the last stage of moving blade of the 600MW unit steam turbine is simple and convenient to operate, has a low cost and has a low requirement on the tonnage of forging equipment; the equipment is simple and is convenient to maintain; blade profiles have small allowance, are uniformly distributed and have good consistency; the finish machining and polishing speed is increased; the corrosion resistance and the mechanical performance of the blade are improved; the yield strength and the tensile strength of a fine rolled blade are superior to those of a die forged blade; the production processing noise pollution is reduced; and the labor environment is improved.

Description

technical field [0001] The invention relates to a blade forging technology, in particular to a roll forging technology of a steam turbine final stage moving blade. Background technique [0002] At present, the production of the last-stage moving blades of steam turbines mainly involves die forging raw materials. The blades produced by the die forging process have a large amount of deformation during the cooling process, so a large amount of deformation needs to be reserved. The margin to be processed is large, the material is wasted more, the cost is high, and the margin on the surface of the blade is not uniform, and the consistency of the margin on the surface of the blade is not good. At the same time, steam turbine blades have different sizes according to different models, so different molds are required for production. When the batch size is large, the production cost of the blade is low, but when the batch size is small and the model size is different, the production c...

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Problems solved by technology

[0002] At present, the production of the last-stage moving blades of steam turbines mainly involves die forging raw materials. The blades produced by the die forging process have a large amount of deformation during the cooling process, so a large amount of deformation needs to be reserved. The margin to be processed is large, the material waste is more, the cost is expensive, and the margin on the surface of the blade is not uniform, and the consistency of the margin on the blade surface is not good

At the same time, steam turbine blades have different sizes according to different models, so different molds are required for production. When the batch size is large, the production cost of the blade is low, but when the batch size is small and the model size is different, the production cost is relatively high. high

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