关键词: 直接分层, 实体模型, 产品模型数据交换标准, 快速成型制造

Abstract: A STEP(standard for the exchange of product model data)-based approach of direct slicing of three-dimensional Computer Aided Design(CAD) solid models outside CAD system for rapid prototyping was presented. Original CAD model was imported into slicing system from CAD system by STEP standard format. Using OpenGL graphics libraries, the solid model was then displayed and specified before being sliced directly. Then the CAD model was sliced automatically after customer defined the layer thickness. The sliced contours were exported by Security Socket Layer (SSL) file format and could be sent to rapid prototyping machines for fabrication directly. STEP-based direct slicing does not rely on any specific CAD system and has better universality and flexibility. The size of a components STEP file is much smaller than the Standard Template Library (STL) file, which makes it convenient for the data transfer and exchange in Internet-based design and manufacturing.

Key words: direct slicing, solid model, standard for the exchange of product model data, rapid prototyping & manufacturing