轮胎胎面胶料挤出口型逆向数值设计

Inverse Numerical Design of Extrusion Die of Tread Rubber

针对某胎面胶(TMG)挤出断面与施工设计断面局部误差较大问题,利用Polyflow软件,选取Phan-Thien and Tanner(PTT)本构模型和Navier滑移模型,逆向数值设计了该胶料的挤出口型。分析口型出口形状的成因,针对口型出口处速度场分布不均这一结果,选取不同流道长度逆向设计口型并分析其对挤出质量的影响。结果表明,胶料在口型出口处沿挤出方向的速度分布决定了逆向设计口型的出口构型;流道长度对口型出口截面积、胀大比、沿挤出方向的速度分布以及压力分布影响显著;逆向设计口型挤出断面与施工设计断面具有很好的一致性。

Considering the larger relative error of local area of tire tread(TMG),the inverse numerical technique was used to design the extrusion die by selecting Phan-Thien and Tanner(PTT)constitutive equation and Navier slip equation with Polyflow.The die outlet was analyzed.Based on the uneven velocity distribution,channels of different lengths were selected to design die and analyze their influence on extrusion quality.The results show that the configuration of inverse designed die depends on the velocity distribution along extrusion direction at the exit;the effect of channel length on area of die outlet,swell ratio,the velocity distribution and pressure distribution is significant;the redesigned extrusion section has good agreement to the construction designed section.