Abstract
Hollow blades which have large size and complex surface are difficult to control springback and dimensional accuracy in hot forming. The forming molds only have upper and lower die that it cannot control the material flow effectively. So, a new hot forming process has been proposed. In this paper, a blade back arc that is used in nuclear steam turbine stator and formed through hot drawing with binder is chosen as the research object. After optimizing the forming parameters, numerical simulation technology is used to forecast the forming quality, and the part trial test agrees with the simulation results. The thickness of part meets the requirements, and the springback results show that springback of part is beyond the tolerance range in small area. According to the test result, die surface is compensated. After that, springback is controlled into an acceptable range. Compared with former hot forming process, the new hot forming process controls the material flow effectively, and blade back arc has small springback and high accuracy.
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