Meanwhile, the drawing regulations about line segments and curly segments of tube bending surface are analysed.

同时还利用计算机图形学原理，对管件外圆表面直线段、弯曲段的三维绘制进行处理分析。

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BASF have developed a new system which provides coatings with improvements in surface hardness as well as better bending and deep-drawing strength.

BASF已经研发了一项新的系统，可以改善涂层表面硬度，并且使涂层有更好的弯曲度和深拉伸强度。

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On the basis of calcuiation and experience, through side-bending test, test piece's extensibility is relative small, and its weld surface after processed is unaffected by the piece's surface quality.

根据计算和经验，侧弯伸长率小，且焊缝表面经过加工，不受表面质量影响，所以试验结果更接近实际，更为准确。

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