大型水压机阀芯驱动系统双圆弧凸轮设计及应用

针对大型水压机阀芯驱动系统中开启驱动力巨大和瞬变的特点，提出了一种适合该特点的双圆弧组合凸轮升程曲线设计方法．该方法通过寻找组合圆弧曲线使凸轮的压力角在阀芯开启力最大时具有较小的值，在全程范围内具有较快的开启速度.通过齐次坐标变换建立了凸轮轮廓的数学模型，利用等效曲柄滑块机构分析了其运动特性.将该方法应用于300 MN模锻水压机阀芯驱动系统中的凸轮设计，运动学分析表明该凸轮在两段圆弧的衔接点处有较好的柔性，冲击小.工业现场应用表明双圆弧凸轮能有效降低装置的故障频率，为负载具有瞬变重载特点的凸轮设计提供了一种有效的方法.

Design and Application of Cam with Two Arc Curve in the Spool Opening of Large Water Hydraulic Press

Considering the huge and transient force in the spool opening process of the hydraulic press, a cam profile curve design method based on the combination of two arcs was presented. The method aims at getting small pressure angles when the driving force reaches its maximum value and getting a fast opening speed in the whole process by finding a suitable combined two-arc curves. The mathematical model of the cam profile was established on the basis of homogeneous coordinate transformation, whose kinematic characteristic was investigated by using equivalent slider crank representation. This method was applied on the cam design of the spool drive system in 300MN die forging hydraulic press. The cam has good flexibility and small impact. Industrial field application shows that the cam designed in this method can effectively reduce the frequency of equipment failures. This method provides guidance for cam design on the condition of heavy and transient load.