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四柱系列压机提供了液压机最基本的工艺动作:滑块快速下行、慢速加压、保压延时、快速回程并停止;下缸活塞顶出、退回(以动作线图表示见图1)。由于四柱系列产品具有一般液压机的基本动作要求,因此,能满足板料冲压、校正压装、金属冷挤、粉末冶金、塑料压制和砂轮成形等广泛的工艺要求。通常中小吨位的四柱万能压机多采用单泵直接供油系统,以简化液压系统。为使结构紧凑,往往使用高压油泵。同时考虑到一定的生产效率,即有较快的行程速度,故油泵不能选得太小。因此,势必造成能量损失大、总效率偏低和成本较高等缺点。
Four-column series press provides the most basic hydraulic machine movements: the slider quickly down, slow pressure, keeping pressure delay, rapid return and stop; the next piston out of the top, back (in action diagram shown in Figure 1). As the four-column series products have the basic operation requirements of general hydraulic machines, they can meet a wide range of process requirements of sheet metal stamping, press-fitting, metal cold extrusion, powder metallurgy, plastic pressing and wheel forming. Usually small and medium-sized tonnage four-cylinder universal press more with a single pump direct oil supply system to simplify the hydraulic system. To make the structure compact, high-pressure pumps are often used. At the same time taking into account the production efficiency, that is, faster stroke speed, so the pump can not be chosen too small. Therefore, it is bound to cause energy loss, low total efficiency and high cost shortcomings.