大、中型压力机下部一般都带有顶出缸,不同的模具要求顶杆的长度不一。虽然顶出缸的行程可在一定范围内调节,但仍需各种长度的顶杆,以满足冲压工艺的要求。目前常用的顶杆有整体式和螺纹调节式。由于这两种顶杆都存在不足之处,我厂在吸取上述两种顶杆长处的基础上,设计成积木式顶杆。由于积木式顶杆螺纹仅起联结作用,顶出力是靠各节顶杆的环形平面传递的,因此提高了承载能力。并且它的调节范围大,通用性好,特别适用于不能采用螺纹调节式顶杆的直径较小的顶出孔。设计这种顶杆的关键是如何 Large, medium presses generally have a lower part of the top of the cylinder, different mold mandrel length requirements vary. Although the stroke of the jacking cylinder can be adjusted within a certain range, various lengths of jacks are still needed to meet the requirements of the stamping process. Currently used jack has a whole and threaded adjustment. Because of these two mandrels are inadequate, I draw on the strengths of the two mandrels on the basis of the above, designed as a modular jack. As the modular jack thread only play the role of coupling, the ejection force is delivered by the ring plane of each section of the mandrel, thus increasing the carrying capacity. And its wide range of regulation, versatility, especially for the use of threaded mandrel less diameter ejector hole. The key to designing such a ram is