塑料异型材真空定型模冷却水道优化设计

Optimization design in cooling channels of vacuum calibrator for plastic profile extrusion

热的塑料异型材通过定型模来冷却定型,因此定型模内冷却水道的设计是保证型材成型质量的重要基础.通过分析型材冷却过程中的热传递方式,对传热模型、初始条件和边界条件进行了深入的分析和计算,完成了塑料异型材在定型模内冷却过程的数值模拟.在此基础之上,以定型模出口处型材截面上各点冷却均匀性和效率为优化目标,基于有限元分析结果和水道参数化模型建立目标函数的数学模型,对水道的位置参数进行优化设计.通过生产型材SF 66的定型模的优化设计和实验,验证了该方法的正确性和有效性.

Plastic profile produced by extrusion die is cooled down and calibrated by calibrator, so it is very important to properly design the cooling channels in calibrator for the profile quality. Based on the analysis of heat transfer way during the cooling process, the heat transfer models are presented, initial and boundary conditions are further analyzed and computed, and then the cooling process of plastic profile within calibrator is simulated. The optimization objective of the model is to obtain the cooling uniformity and efficiency of each domain in the cross sections of the calibrator＇s exit. Based on the finite element analysis results and the parametric model of the channel, the mathematical model of the objective function is established, and the optimization design of the channels＇ positions is fulfilled. Lastly, the correctness and the validity of the method are illustrated through optimization design and experiments of SF66 profile＇s calibrator.