Design of final forging punch for hollow valve based on cross wedge rolling preformed blank
Jiang Xiaodan，Zhang Zhengrong，Lin Xijia
（Faculty of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China)
Abstract: The punch’s shape size in the process of cross wedge rolling and final forging of the hollow valve was studied. According to the characteristics of the performed blank in final forging process, three kinds of final forging punches with different initial dimensions were designed, and the influences of the punches on the final forging process of preformed blank were studied by combining experiment with numerical simulation. The simulation results show that if the punch mandrel is too short in the final forging process, the front end of the punch mandrel appears the phenomenon of material gathering, and the cavity dimensions of the final forging cannot be formed. However, the experimental results show that the over-long punch mandrel will lead to the difficulty of unmold in final forging in the actual production. According to the analysis on results of both simulation and experiment, the design principle of the punch mandrel was obtained and the appropriate length of the punch mandrel was determined. Based on above research, the reasonable shape and size of the final forging was obtained by the designed punch.
Key words: hollow valve final forging mold design numerical simulation
 
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