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几何造型是ＣＡＤ系统中的关键技术。复杂外形零件几何造型一直是ＣＡＤ领域中的难题。本文在ＵＧ软件的基础上，综合运用曲面造型、实体造型和特征造型的方法成功地建立了描述单螺杆零件几何特征的数学模型，此种方法同样适用于其它的复杂零件。
Geometric modeling is the key technology in CAD system. The geometric shape of complex shape parts has always been a problem in the field of CAD. On the basis of UG software, this paper successfully builds a mathematical model describing the geometric characteristics of single-screw parts by comprehensively using the methods of surface modeling, solid modeling and feature modeling. This method is also applicable to other complex parts.