Design of relief-cavity in closed-precision forging of gears
来源期刊：中南大学学报(英文版)2015年第4期
论文作者：ZUO Bin WANG Bao-yu LI Zhi ZHENG Ming-nan ZHU Xiao-xing
文章页码：1287 - 1297
Key words：gear forging; precision forging; relief-cavity; alternative die; metal flow; corner filling
Abstract: To reduce the difficulty of material filling into the top region of tooth in hot precision forging of gears using the alternative die designs, relief-cavity designs in different sizes were performed on the top of die tooth. The influences of the conventional process and relief-cavity designs on corner filling, workpiece stress, die stress, forming load and material utilization were examined. Finite element simulation for tooth forming, die stress and forming load using the four designs was performed. The material utilization was further considered, and the optimal design was determined. The tooth form and forming load in forging trials ensured the validity of FE simulation. Tooth accuracy was inspected by video measuring machine (VMM), which shows the hot forged accuracy achieves the level of rough machining of gear teeth. The effects of friction on mode of metal flow and strain distribution were also discussed.
ZUO Bin(左斌), WANG Bao-yu(王宝雨), LI Zhi(李智), ZHENG Ming-nan(郑明男), ZHU Xiao-xing(朱小星)
(School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China)
Abstract:To reduce the difficulty of material filling into the top region of tooth in hot precision forging of gears using the alternative die designs, relief-cavity designs in different sizes were performed on the top of die tooth. The influences of the conventional process and relief-cavity designs on corner filling, workpiece stress, die stress, forming load and material utilization were examined. Finite element simulation for tooth forming, die stress and forming load using the four designs was performed. The material utilization was further considered, and the optimal design was determined. The tooth form and forming load in forging trials ensured the validity of FE simulation. Tooth accuracy was inspected by video measuring machine (VMM), which shows the hot forged accuracy achieves the level of rough machining of gear teeth. The effects of friction on mode of metal flow and strain distribution were also discussed.
Key words:gear forging; precision forging; relief-cavity; alternative die; metal flow; corner filling
