金型CAD用反転形状の自動生成に関する研究

抜取り可能性の判定

抄録

Although a mold is one of the most powerful tools in the production activity, mold designers depend on their experience and intuition to determine mold configurations. Mold CAD systems, in these days, can assist mold designers from initial mold design to performance analysis. But mold designers are forced to control the whole design process and to make no mistakes. Basically, a mold shape is generated by (1) reversing a product shape in a blank shape and (2) dividing it into two or more parts, named a cavity, core and side-core, respectively, along with parting lines. In this mold generating process, designer must at least determine the parting direction and parting lines in order to be able to eject products from the mold, and not allowing mistakes. It would be ideal if the system automatically generates the mold shape model from the given product model without any assist from the designer. As the first step to construct the ideal mold CAD system, this paper presents the algorithm which determines the ejectability of products from a mold in the given parting direction, including automatic generation of parting lines, applied to CSG·B-Reps dual solid product model.