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Core and cavity generation method in injection mould design In a computer-aided injection mould design system, the generation of parting surfaces and the creation of core and cavity blocks is usually a bottleneck. The parting surfaces and core/cavity blocks are created based on the parting direction and parting lines. Here, the architecture of an injection mould design system is proposed on the basis of the practical information flow and processing steps in mould production lifecycle. In this architecture, the methodology to generate the parting surfaces and the core/cavity blocks is proposed. To generate the parting surfaces, the parting line edges are classified and the extruded directions specified to the different groups of parting line edges. Extruding the parting line edges to the boundary of the core/cavity bounding box generates the parting surfaces. To create the core/cavity blocks, the Boolean regularized difference operation (BRDO) is used and the related algorithms are presented. The criterion to identify whether the undercut features need local tools for moulding is proposed. The case studies illustrate and validate the methodology to generate the parting surfaces and core/cavity blocks.22333
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In injection mould design, the main design activities include the determination of parting direction, parting lines and surfaces, selection of mould types, cavity layout, gating, ejection, venting, heating/cooling types, mould materials, and the temperature control system. After the parting direction and lines are determined and the design scheme is decided, the rest of the detailed design activities mentioned above can proceed. Based on the known parting direction and parting lines, the methodologies related to the generation of parting surfaces and core/cavity blocks are presented.
To generate the core/cavity blocks automatically, two methods known as the Boolean-based approach (BBA) and the Euler-based approach (EBA) are described here. In BBA, the core/cavity blocks are generated using the Boolean regularized difference operation (BRDO) between the core/cavity bounding box and the moulding. In EBA, the Euler operation is the key process to generate the related core/ cavity block surfaces. In BBA, the representative work to generate the core/cavity blocks of a mould is reported by Hui and Tan (1992). The procedures are to sweep the moulded part in the parting direction to generate a swept solid and construct a cavity solid. A cavity preform is then generated by the BRDO between the cavity solid and the swept solid in the cavity side. Similarly, a core solid is generated and a core preform is created by the BRDO between the core solid and the swept solid in the core side. Finally, the core and cavity blocks are created by the BRDO between the core and cavity performs in the closed position. In this work, the method in sweeping the moulded part in the parting direction is non-trivial and represents a challenge in a computer-aided design system.
型芯和型腔在注射模设计中的生产方法
在计算机辅助注射模设计系统中，分型面的产生和创建型芯型腔区域通常是难点。分型面和型芯型腔区域是在分型方向和分型线的基础上创建的。如今，注射模的结构学设计系统是基于实际信息流动和模具生产过程的加工步骤所提出来的。在这个建筑学中，提及到了生产分型面和型芯型腔区域。为了创建分型面，对分型线作出了分类和根据分型方向规定了不同种类的分型线。根据型芯型腔区域边界来作出分型线，然后创建分型面。为了创建型芯型腔，与现代算法有关的的不同操作的布尔法则被使用了。论文网
在注塑模设计中，主要的设计项目有开模方向的开模距离，分型线和分型面，选择模具的类型，型腔的布局，浇口，喷嘴，排气，加热/冷却类型，模具材料和温度控制系统。在确定好分型方向和分型线后就要考虑设计安排，剩下的设计项目的细节就能够开始。根据已知的分型方向和分型线，提出了与产生分型面和型芯型腔区域的方法。