The key technique of virtual product development is how to obtain knowledge models from reality, to knowledge classification, express, to build knowledge base and knowledge models effectively.
虚拟产品设计的关键技术是如何从现实中提取产品知识信息的模型，对知识进行分类和表达，有效地建立知识信息库和知识模型。
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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