论文部分内容阅读
以典型车身结构B柱为研究对象,结合实验与仿真分析研究其树脂传递模塑(RTM)工艺的优化设计方法。研究了通过注射方式的优化控制树脂流动前沿,从而达到降低制件孔隙率和保证制件质量的目的。首先通过自制的变厚度渗透率测试模具获取所选用织物的渗透率,之后通过真空辅助RTM实验与对应模拟仿真进行对比分析来验证所采用仿真方法与渗透率数据的可靠性。最后结合充模周期与孔隙率控制理论对RTM工艺注射口分布及注射方式进行优化设计。结果表明,针对所选定车身结构,优化速率注射方式所获得的制件孔隙率最低,但充模周期较长,而基于双点注射的恒流量注射方式能较好地兼顾充模周期与制件孔隙率的要求。
Taking the B pillar of a typical vehicle body structure as the research object, the optimum design method of the resin transfer molding (RTM) process was studied with the experiment and simulation analysis. The optimization of the flow front of the resin through injection is studied to reduce the porosity of the part and ensure the quality of the part. First, permeability of the selected fabric is obtained by a homemade variable-thickness permeability test mold. Then the reliability of the simulation method and permeability data used is verified by comparing the vacuum-assisted RTM experiment with the corresponding simulation. Finally, the injection mold design and injection mode of RTM process are optimized according to the theory of mold filling cycle and porosity control. The results show that for the selected car body structure, the optimum rate of injection obtained the lowest porosity, but the mold filling cycle is longer, while the two-point injection of constant flow injection method can better take into account the cycle and the filling of the system Piece porosity requirements.