胶印机滚筒结构的拓扑及尺寸优化设计

胶印机滚筒在印刷压力作用下的挠曲变形是影响印品质量的重要原因。以PZ1740胶印机橡皮滚筒为研究对象,提出了一种基于拓扑优化和尺寸优化的橡皮滚筒结构设计方法。建立了滚筒结构的二维拓扑模型,以应变能最小为目标,体积分数作为约束,得到滚筒结构的拓扑分布;在拓扑构型基础上,建立了滚筒结构的参数化模型,以挠曲变形最小为目标,结构质量作为约束条件进行尺寸优化,得到了滚筒具体的结构。优化分析结果表明,优化后的滚筒结构在质量约束的条件下有效地减小了挠曲变形,提出的方法在胶印机滚筒结构优化设计中可行且有效。

Topology and Sizing Optimization for Structure Design of Printing Cylinder

The flexural deformation of printing cylinder under the printing pressure is an important factor influencing printing quality. Structural design method of printing cylinder based on topology optimization and size optimization was put forward with an example of PZ1740 blanket cylinder. In topology optimization, two-dimensional topological model was established; the topology distribution was obtained with minimizing compliance as objective and volume fraction as constraint. Parametric model of printing cylinder was built for size optimization; detailed structure of printing cylinder was obtained using minimizing flexural displacement objective and mass as constraint. The optimization results showed that printing cylinder structure can effectively reduce flexural displacement under constraint mass; the proposed method is feasible and effective for optimal design of offset printing cylinder.