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CAD技术起步于50年代后期。60年代,随着计算机软硬件技术的发展,人们为了摆脱繁琐、费时、精度低的传统手工绘图,借助CAD技术用传统的三视图方法来表达零件,以图纸为媒介进行技术交流,这就是CAD发展初期的二维计算机绘图技术。60年代出现的三维CAD系统只是极为简单的线框式系统,由于缺乏形体的表面信息,CAE及CAM均无法实现。70年代,法国人提出了贝赛尔算法,实现了计算机的自由曲面造型技术。在此基础上,80
CAD technology started in the late 1950s. In the 1960s, with the development of computer hardware and software technology, in order to get rid of the cumbersome, time-consuming and low-precision traditional hand-drawing, people used CAD technology to express the parts in the traditional three-view method and used paper as a medium for technical exchange. This is CAD Early development of two-dimensional computer graphics technology. The three-dimensional CAD system that appeared in the 1960s is a very simple wireframe system. Due to the lack of physical surface information, CAE and CAM can not be realized. In the 1970s, the French proposed Bezier’s algorithm to realize the free-form modeling technology of computers. On this basis, 80