目前有关夹具设计的资料只介绍了圆偏心夹紧机构的设计方法。圆偏心机构固然有制造方便的优点,但其升角变化较大,所以夹紧力变化也较大,而且工作转角不可能超过180°。阿基米德螺线凸轮升角变化较小,工作转角可超过180°,增大了有效工作行程,在某些情况下可进一步缩小机构尺寸。现将曲线有关特性及机构设计方法简介如下。 At present, the information on fixture design introduces only the design method of circular eccentric clamping mechanism. Although the circular eccentric mechanism has the advantages of easy manufacture, but its larger angle of change, so the clamping force changes also larger, and the working angle can not exceed 180 °. Archimedes spiral cam angle changes smaller, the working angle can be more than 180 °, increasing the effective working stroke, in some cases can further reduce the size of the mechanism. Now the curve of the relevant characteristics and design methods are as follows.