20th International Forgemasters Meeting - IFM 2017

Abstract：The study on the multi-ram forging of the high temperature-pressure valve body is intended to meet the technical requirements for the valve body sustaining high steam parameters in thermal power generation units. The multi-ram forging of a 3-inch gate valve body was used as an example to demonstrate the features of the multi-ram forging, in which principles and methods of multi-ram forging was elaborated through the die design of the 3-inch gate valve body. Numerical simulation was used to investigate the influence of the tool’s movement sequence on the forming load, clamping force, the horizontal punch load, the vertical punch load and the temperature distribution on the tools. The experiment on a 40MN multi-ram hydraulic press produced a 3-inch gate valve body forging with required dimensions. In compliance with national technical requirements, mechanical properties test and the forging flow line observation were done with the multi-ram forged valve body, which indicate that: the multi-ram forged valve body achieved better technical qualities than those required by the national standard. Keywords：multi-ram forging；high temperature-pressure valve；plastic forming; numerical calculation