Abstract
In the injection molding process, plastic products are difficult to demold due to friction force between the cavity and products, thus, finished products might be deformed or damaged. Therefore, designers should add a draft angle to the geometric surface of products, which is parallel to the unloading direction, in order to help the products eject smoothly from the cavity. This study uses CAD software as the main architecture to develop the function of automatic draft angle recognition and construction. The study is divided into three stages. First, the geometric features of products are identified in the CAD model by induced algorithm, then the quilts to be added in the draft design are determined and classified. Finally, draft angles are created in different ways according to different surfaces. An algorithm suitable for automatic draft recognition and construction, as well as the constraints of automatic creation of draft angle, is proposed. The feature recognition algorithm of this study can automatically inspect 90% of the surfaces to be drafted, and the automatic creation of draft features can economize 80% of required mouse clicks, thus, effectively increasing draft angle design efficiency, and preventing errors in mold design and manufacturing.
Highlights
This study uses CAD software as the main architecture to develop the function of automatic draft angle recognition and construction
The merits and demerits of different feature recognition methods are compared in literature, where it is observed that the feature recognition methods can effectively increase product design and manufacturing efficiency; after the recognition result is obtained, the subsequent design work still depends on manual operation, and its integration is seldom studied
Link is used in order to recognize a surface with insufficient draft angle according to the geometrical relationship among all the surfaces of demolding direction, and product model, where every surface to be drafted is classified, and the implemented draft function of CAD software is used for automatic draft angle creation
Summary
Fuh et al [18] proposed a three-dimensional mold design system (IMOLD) for business CAD software This system divides modeling into four major stages, the creation of a project, cavity and core creation, runner design, and mold base design, which provides the functions to control the project and assists the designer to complete the project correctly. The merits and demerits of different feature recognition methods are compared in literature, where it is observed that the feature recognition methods can effectively increase product design and manufacturing efficiency; after the recognition result is obtained, the subsequent design work still depends on manual operation, and its integration is seldom studied. Only increases design efficiency, and prevents errors in mold design and manufacturing
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