本文介绍了一种利用慢度曲面判断三方晶系晶体纯模轴的方法。

A method of obtaining the pure mode direction of the trigonal system by the slowness surfaces is introduced.

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介绍了管材无模轴压胀形的实验，研究表明，适度的褶皱有助于提高成形极限。

It has been experimentally indicated that moderate wrinkle will make a contribution to enhancing the formability of the dieless tube hydroforming.

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针对这一问题，本文研究了零件加工误差对动模板合模位置的影响，得出了零件加工误差的许用值范围，并计算了由于销轴摩擦力对合模力放大比的影响关系式。

Aiming at these problems, this paper studies how the original error affects the accuracy, works out its allowable values, and finds out the equation between friction of pins and clamping force.

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So i and j are vectors of length one, pointing along x and y.

和 j 是模长为1的矢量,分别指向 x 轴和 y 轴方向

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