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为解决金属超轻结构零件设计技术复杂、设计周期长、难添加蒙皮进行增材制造等难题,提出一种基于激光选区熔化增材制造工艺的金属零件自动超轻结构化设计方法:根据激光选区熔化工艺特点,编制程序将原始零件CAD模型自动转化为设定孔隙率的带蒙皮类蜂窝状超轻结构零件模型,且其数据可直接驱动设备实现零件增材制造。研究了带蒙皮超轻结构的构造形式及设计方法;探讨了合适的成型棱长及合理蒙皮结构形式;成功实现复杂零件自动带蒙皮超轻结构化设计及增材制造,所得零件孔隙率误差2.79%,表明能较准确按预期减重。该方法能根据原始零件CAD模型自动、快速地构建带蒙皮金属超轻结构零件模型,大大减轻该类零件设计负担及提高其实用性。
In order to solve the problem of complex design technology of metal ultra-light structural parts, long design cycle and difficult to add skin for additive manufacturing, an automatic and ultra-light structured design method of metal parts based on laser selective additive manufacturing process is proposed: The characteristics of the melting process in the constituency are as follows: The preparation process automatically converts the CAD model of the original part into a model of a skin type honeycomb-like ultra-light structure with a porosity setting, and the data can be directly driven to realize the additive manufacturing of the part. The structure and design method of the skinned ultra-light structure are studied. The appropriate forming edge length and reasonable skin structure are discussed. The successful realization of the ultra-light skin structure design and the additive manufacturing of the auto-belt of the complex part, The rate error of 2.79%, indicating that more accurate expected weight loss. The method can automatically and quickly build the model of the metal parts with ultra-light skin based on the CAD model of the original parts, which greatly reduces the design burden and the practicality of the parts.