基于正交试验的闭式挤压工艺参数优化

Processing parameters optimization of closed extrusion based on orthogonal experiment

以农用机械传动部件"流转插头"为例,利用DEFORM-3D软件对挤压成形过程进行分析,揭示了该类316L不锈钢锻件的热锻造成形载荷和热磨损的变化规律。基于正交试验法全面分析了坯料初始温度、模具初始温度、打击速度、模具硬度对成形载荷和模具磨损深度的影响规律。结果表明:4组因素中,打击速度对成形载荷的影响最大,模具硬度对模具磨损深度的影响最大;综合考虑4个因素的模拟结果确定了最优方案,即坯料初始温度为1150℃、模具初始温度为250℃、打击速度为0.3 m·s^(-1)、模具硬度为62HRC。实际生产发现,按照最优方案中的初始温度和打击速度能够生产出质量合格的锻件。

Taking the circulated plug of a kind of agricultural machinery transmission parts as the case, the hot extrusion forming process was analyzed by using the DEFORM -3D software, and the changing rules of the hot forming force and the thermal wear about the 316L forgings were revealed. The influences of the blank initial temperature, the die initial temperature, the blow speed and the die hardness on forming force and die wear depth were analyzed comprehensively based on orthogonal test. The result shows that the blow speed has the greatest effect on the forming force and the die hardness has the greatest effect on die wear depth. Based on the simulation results about the four factors, the optimal plan was obtained with the blank initial temperature of 1150 ℃, the die initial temperature of 250 ℃, the blow speed of 0. 3 m . s - 1and the die hardness of 62HRC. It is found that qualified forging is obtained with the optimal initial temperature and blow speed.