熔体温度对水穿透行为影响的可视化研究

Visualization Study on Effect of Melt Temperature on Water Penetration Behavior During Water-assisted Injection Molding

利用水辅助注塑可视化模具和自主研发的注水系统,以聚苯乙烯为原料,对不同熔体温度下的水辅助熔体流动充模的过程进行了观察,并研究了水的穿透行为。结果表明,熔体温度低,水前缘熔体的惯性力增大,产生"折线"水道,水在后半模腔熔体的穿透中,水前缘速度与水前缘熔体速度相近;熔体黏度高,水前缘速度大于水前缘熔体速度;熔体温度越高,射流穿透的时间越长,水在前半模腔穿透用时越少。

This report investigated the effect of melt temperature on the water penetration behavior in water-assisted injection molding process using visualization technology. Experiments were carried out with the help of a newly home-developed water injection system and visual mold. The material used was polystyrene. The water-assisted melt filling processes at different melt temperatures were observed. It was found that low melt temperatures increased the melt inertia in the front of water flow, which leaded to the appearance of a water channel in broken lines. The rate of water front was closer to that of water-front melt. The time for water jet penetration and water penetration in the front half mold increased with increasing melt temperature.