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摘要：
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300MN巨型水压机的动梁在驱动系统卸载时由于偏载变化速度较快,从而产生比加载过程中大得多的反向偏转角,可能造成立柱损伤。由于在卸载过程中锻件的变形抗力中心变化很小,因此可采用压力传感器间接测量偏载,从而实现驱动系统卸载时对动梁液压位置保持系统进行同步卸压。仿真结果表明,在卸载速度为加载速度的3倍工况下,动梁最大偏转角仅为加载时的10%。
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The poles in the 300 MN large-scale water press is properly damaged by antiverse eccentric angle of water press's moving beam,which is much bigger than the eccentric angle created in loading course,brought by rapidly changing eccentric load during the time that the driving system is discharging.Eccentric load could be indirectly measured by pressure sensor because center of forging blank deforming drag changes little,consequently moving beam position holding system could be discharged simultaneously when the driving system was discharged.The results of simulation and experiment both show that this method is very useful to decrease the maximum deflection angle when driving system is in the discharging state.Simulation results show that the largest eccentric angle in unloading course is not more than one tenth of it when in loading course even if the unloading velocity is three time faster than that in loading course.
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基金项目：
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国家973项目资助(2005CB724102);;
湖南省自科基金资助(06JJ20045)
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作者简介：
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参考文献：
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[1]谭建平,刘昊.溢流型液压位置保持系统的研究和应用[J].机械工程学报,2004,40(3):119-123.
[2]张友旺,谭建平,钟掘.模锻液压机同步平衡系统开关和比例控制的自动调节特性分析[J].机床与液压,1998,15(1):36-38.
[3]蒋鹏,付殿禹,曹飞,等.铁路货车钩尾框精密辊锻过程数值模拟[J].锻压技术,2007,32(3):107-110.
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