美国Wyman Gordon和Barogenics公司共同制造了一台220000吨大型模鍛压力机(图1)。全部压力只由一个新結构的液压缸(图2)产生。由于这种巨大的液压缸不可能做成一个整体,故建議用螺釘将扇形块固接而成。螺釘的直径应这样选择:使其剪切强度能承受缸中的压力,并能将此压力安全地佳到扇形块上,以及使扇形块与缸底牢 US Wyman Gordon and Barogenics co-manufacture a large 220,000-ton forging press (Figure 1). All pressure is only generated by a new structure of the hydraulic cylinder (Figure 2). Because of this huge hydraulic cylinder can not be made as a whole, it is recommended to screw the fan block is fixed. The diameter of the screw should be chosen such that its shear strength will withstand the pressure in the cylinder and will be able to safely secure this pressure to the segments and to secure the segment to the bottom of the cylinder