通过调节工艺参数控制热熔法制备的自动铺丝预浸纱的展开质量

Improving Lateral Spreading Quality by Adjusting Hot-melt Process Parameters Applied in Automated Fiber Placement

热熔法是高效制备自动铺丝预浸纱的方法,如何保证纤维展开充分、展宽稳定,是预浸纱制备技术的工程难点。本工作在机器视觉检测技术的基础上,以现有的热熔手段作为前提,对自动铺丝预浸纱制备的整体方法进行了分析,搭建了试验平台,研究了预浸纱展开质量的主要工艺参数。利用正交试验分析树脂加热温度、纤维牵引速率、纤维张力及胶膜厚度对预浸纱宽度的影响,进而取得最佳的结合方案。结果表明,胶膜厚度对预浸纱宽度的影响最大,其次为树脂加热温度,第三为纤维张力,纤维牵引速率的影响最小。针对航天用氰酸酯树脂,影响因素的最优组合分别为胶膜厚度0.6 mm,树脂加热温度90℃,纤维张力2 N,纤维牵引速率4 m/min。

The width and stability are the most important properties for prepreg and they are also the difficult points of prepreg manufactured by hot-melt method.Based on the machine vision technology and the current hot-melt method,the overall plan to produce prepreg for automated fiber placement(AFP)was designed and then the experimental platform was constructed to research the effect of impregnation process on the spread quality of prepreg.The impregnation process of prepreg and its influence factors such as heating temperature of resin,velocity of prepreg,tension of prepreg and thickness of resin film were analyzed by orthogonal experiment and the group of optimal factors were acquired.This research shows that thickness of resin film is the most important factor,the second is heating temperature of resin,the third is tension of prepreg and the last is pulling velocity of fiber.The group of optimal factors are heating temperature of resin is 90℃,thickness of coating is 0.6 mm,tension of prepreg is 2 N and velocity of prepreg is 4 m/min for the cyanate ester.