关键词: 模型分割, 联接键, 快速成型, 轮廓偏移, 装配

Abstract: For the large-scale models which exceeded existing machining scope, it was usually divided into several small models with similar-shaped joints to perform machining and assembly. To improve assembly accuracy and generating efficiency of sub-models, a new method was proposed to generate similar-shaped joints on the assembly surface rapidly. Similar-shaped joints contour was obtained by offsetting cutting contour directly, thereby the second order modeling and Boolean operation among models were omitted. The maximum depth of similar-shaped joints was determined by contour projection method, and the rationality of assembly depth was ensured. Furthermore, the construction of similar-shaped joints and the closing of the sub-model were conducted simultaneously so that the consistency of the triangulation of assembly features was guaranteed and the assembly accuracy was also improved.

Key words: model partition, joints, rapid prototyping, contour offset, assembly