轮胎花纹排气场气体的流动性分析

Analysis of Air Vent of Tire Molding with Different Tread Pattern

基于流体动力学理论建立轮胎不同形状花纹的排气场数学模型,采用流场分析软件Fluent研究胎坯二次定型过程中花纹排气场气体的流动性。结果表明:对于矩形花纹设置2个气孔能使气体更好分流,减少气体与型腔壁面的碰撞;气孔直径为3 mm时出口气体速度趋于平稳,型腔内部压力相对恒定;调整多边形花纹排气气孔数量,并在花纹转角处设置1个气孔,可提高气孔排气性能;从气孔进口到出口湍流强度逐渐递增,在壁面达到峰值。

Based on the theory of fluid dynamics,a mathematical model of the vent field for tire molding with a different tread pattern was established.The air flow in the vent field of tread pattern during the second stage of tire molding process was then analyzed using software Fluent.The results showed that,when two vents were set for rectangular pattern,the gas flow was well split and the collision between the gas and cavity wall could be reduced.When the vent diameter was 3 mm,the outlet gas velocity was stable,and the internal pressure of the cavity was relatively constant.For the polygonal pattern,the vent performance could be improved by adjusting the number of the vents and setting one vent at the corner of the pattern.The turbulence intensity increased gradually from the inlet to the outlet of the vent,and the peak value was reached at the surface of the wall.