本文肯定了摆辗压机上模头的运动是自转与公转的合成运动。给出了上模头作纯滚动时,考虑压下量的滞后角计算公式。同时又就当前文献上对滞后的认识和克服滞后的设想作了分析,提出了新看法,并设想了新的防转机构。最后推导出求摆头与锻件接触面上任意一点速度的计算公式。 This paper affirms the movement of the die on the rolling machine is a composite movement of rotation and revolution. The calculation formula of the retard angle considering the reduction is given when the upper die is purely rolling. At the same time, the current literature on the understanding of the lag and the idea of ​​overcoming the lag were analyzed and put forward new ideas, and envisaged a new anti-rotation mechanism. Finally, the formula for calculating the velocity at any point on the contact surface between the head and the forging is deduced.