快锻液压机检测精度影响因素研究

Research on influencing factors of detection accuracy for quick forging hydraulic press

针对目前快锻液压机采用位移传感器测量锻件尺寸与实际尺寸存在一定误差的问题,以31.5 MN快锻液压机为研究对象,通过数学建模和有限元分析,研究了活动横梁受力偏转对锻件检测精度的影响规律;通过有限元分析,研究了具有不同上拱弯曲情况的移动工作台的变形规律;通过建立下砧与移动工作台间氧化皮的数学模型,研究了氧化皮压实变形对检测精度的影响规律。结果表明,活动横梁偏转和工作台变形对检测精度的影响均为线性的,可以在控制系统中通过预设线性变形规律对所得锻件尺寸进行补偿,而氧化皮的变形为非线性,不能通过预设线性变形关系对造成的锻件尺寸检测误差进行补偿。

Aiming at the problem that there was a certain error between the actual sizes and the measured sizes of forgings by the displacement sensor in the current quick forging hydraulic press,for the 31.5 MN quick forging hydraulic press,the influence laws of deflection by force for movable beam on the detection accuracy of forgings were studied by mathematical modeling and finite element analysis,and the deformation laws of mobile worktables with different upper arch bending conditions were studied by finite element analysis.Then,the mathematical model of oxide scale between the lower anvil and the mobile worktable was established,and the influence law of the compaction deformation for oxide scale on the detection accuracy was studied.The results show that the influences of the deflection for movable beam and the deformation for worktable on the detection accuracy are linear,and the sizes of obtained forgings can be compensated by preset linear deformation law in the control system.However,the deformation of oxide scale is non-linear,and it is impossible to compensate the caused size detection error for forgings by preset linear deformation relationship.