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逆向工程技术在注塑模具设计中的应用十分广泛,以玩具兵人为例,构建玩具兵人躯干的概念设计模型,应用激光扫描仪进行数据采集,采用逆向工程软件及UG三维造型软件进行产品的曲面重构反求出产品的工程模型,进一步完成产品的结构设计。然后采用Moldflow对材料为ABS的玩具兵人躯干前盖的注塑成型过程进行了预测,包括浇口位置、充填时间、翘曲变形的大小与产生原因、熔接痕位置、气穴等,以期为进一步设计及改进模具结构提供参考。预测结果主要是翘曲变形,产生翘曲的主要原因是材料在冷却过程中收缩不均所致,通过改进模具结构、改善成型工艺条件等方法来减小收缩,从而减小翘曲变形。试模结果和CAE预测吻合较好,且满足质量要求。
The reverse engineering technology is widely used in the design of injection molds. Taking the toy soldiers as an example, the conception model of the toy soldier’s torso is constructed. The laser scanner is used to collect the data. The reverse engineering software and UG three- Reconstruction of the product model of the project, to further complete the product structure design. Moldflow was used to predict the injection molding process of the toy soldier torso front cover with ABS material, including the position of the gate, the filling time, the size of the warp deformation, the reason of the welding deformation, the location of the welding marks, the cavitation and so on. Design and improve the mold structure for reference. The main prediction result is warpage. The main cause of warpage is due to the uneven shrinkage of the material during cooling. The warpage is reduced by improving the structure of the die and improving the molding conditions to reduce the shrinkage. The test results are in good agreement with the CAE prediction and meet the quality requirements.