If you think about the objective of many sports movements, it is to project force forward, whether throwing a football, throwing a punch, or swinging a golf club.
试想一下，很多体育运动的目的都是向前释放力，无论是投橄榄球，出拳，或高尔夫。
The result shows that the punch-force increases with the increasing of the hydraulic pressure, the punch diameter and the thickness of the tube.
结果表明：管内液体压力增加、冲头直径增加、 材料壁厚增加都会使冲头推力增大；
The quality of the internal surface can be greatly improved and the punch force can be significantly reduced by using inner set hose.
内置软管可以有效改善管材的内表面质量，并显著减小冲头推力。
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