The paper research the problem of bow to build the model of cutter with the design technology of virtual product, and built the 3D models of twist drill, gang drill, gear hob;

讨论了用虚拟技术对复杂金属切削刀具进行建模的问题，建立了麻花钻、群钻、齿轮滚刀的三维数字模型；

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Since 2006, in France, an unknown gang of thieves have been emptying supermarket safes, using nothing more than a drill and a modified vacuum cleaner.

自2006年起，法国有一个不知名的盗窃团伙专门开超市保险箱，所用的工具只有电钻和改造的真空吸尘器。

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