较优异的 3D打印树脂模具装配方案可以优化树脂模具拉伸强度、成型误差,为了获取最优装配序列,研究3D打印树脂模具三维虚拟装配序列规划模型.首先,分析三维虚拟模具设计模型的几何拓扑、装配约束等装配信息和三维虚拟模具加工模型的最小误差测度值,在装配特征融合后,构建模具三维虚拟装配模型;然后,以此为基础将树脂模具装配序列规划方法嵌入至模具装配过程中,通过装配信息建模、装配序列生成、装配序列评估与优选实时引导装配操作;最后,运用 3D打印技术依照装配序列最优规划结果制造树脂模具.实验结果表明,该模型可有效完成树脂模具装配序列规划,助力树脂模具成功打印制作;选取碳纤维质量分数、单层固化深度、曝光时间分别为15%、0.04mm及 3s时,模型装配序列规划后制造模具的拉伸强度最优、成型误差最小.
The optimal 3D printing resin mold assembly scheme can optimize the tensile strength and molding error of the resin mold.In order to obtain the optimal assembly sequence,the 3D virtual assembly sequence planning model of 3D printing resin mold is studied.Firstly,the geometric topology,assembly constraints and other assembly information of the 3D virtual mold design model and the minimum error measure of the 3D virtual mold processing model are analyzed.After the assembly features are fused,the 3D virtual mold assembly model is constructed.Then,based on this,the resin mold assembly sequence planning method is embedded into the mold assembly process,and assembly operations are guided in real time through assembly information modeling,assembly sequence generation,assembly sequence evaluation and optimization.Finally,3D printing technology is used to manufacture resin mould according to the optimal planning result of assembly sequence.The experimental results show that the model can effectively complete the assembly sequence planning of resin mold,and help the successful printing of resin mold.When the carbon fiber mass fraction,single layer curing depth and exposure time are 15%,0.04 mm and 3 s respectively,the tensile strength of the manufacturing model is optimal and the molding error is minimum after the model assembly sequence planning.