摘要
使用CFD软件Polyflow,采用非等温的本构方程逆向挤出数字设计了汽车密封件橡胶口模.数值模拟该橡胶口模的挤出过程,数值计算了口模内橡胶熔体的非等温流场,讨论了温度对口模结构尺寸和橡胶熔体流变行为的影响.研究结果表明,沿熔体流动的方向,非等温熔体的平均速度和平均压力比等温的大,平均剪切应力和平均黏度都低于等温.与实际产品截面比较,非等温模拟的口模截面形状比等温的更接近实际情况,相对误差仅为1.63%.非等温的数值模拟更接近口模挤出的实际情况.采用非等温的本构方程设计口模将提高口模和产品的质量.
Under non-isothermal conditions, rubber die profile of car seal is reversely and numerically designed and the extrusion process of the die simulated, using the CFD package Polyflow. The non-isothermal flow field of the die is calculated. Effect of temperature on the structural size of the die and rubber melt rheological behaviors are discussed. The results showed that along the direction of flow of the melt, the average velocity and average pressure of the melts in the die in the non-isothermal conditions are larger than that under the isothermal conditions~ and the average shear stress and viscosity of the melts are smaller. Comparing the numerical size of the rubber die with that of the actual product, the non-isothermal numerical size of the rubber die is better than the isothermal one. Relative error of the die size for the non-isothermal simulation is only 1.63%. Simulation of die extrusion process in non-isothermal condition is closer to the actual process. The quality of the dies and products can be improved using the nonisothermal constitutive equation.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2008年第7期626-630,共5页
Transactions of Beijing Institute of Technology
基金
北京理工大学横向研究基金项目(20040541011)
关键词
数值模拟
橡胶异型口模
非等温流场
numerical simulation
rubber heterotypic die
non-isothermal flow field
