碳纤维/尼龙6预浸料的制备及盒体的热冲压成型工艺

首先利用自主设计的熔融浸渍机头制备了60mm幅宽的连续碳纤维增强尼龙6(CF/PA6)热塑单向带,并利用快速热冲压成型技术制备了CF/PA6复合材料矩形盒体。结果显示,在CF/PA6预浸料制备过程中,纤维展纱包覆角与纤维展宽呈线性关系;预紧力增加展纱宽度的同时,牵引力会呈指数急剧上升,因此应避免大的预紧力;CF/PA6预浸料的浸渍质量随牵引速度的增加而降低;预热有利于改善高浸渍速度下的浸渍质量。在热冲压成型过程中,CF/PA6复合材料的最佳预热温度为260～280℃,模具温度为130～160℃,并应经过预压实。

Preparation of continuous carbon fiber/polyamide 6 prepreg and rectangular box forming by hot stamping

The continuous carbon fiber reinforced polyamide 6 (CF/PA6) unidirectional prepreg of 60 mm width was prepared by a molten impregnation method. A structure of CF/PA6 composites rectangular box was then manufactured by hot stamping method. The results show that the fiber spread width shows a linear relationship with the wrap angle. The large pretension force should be avoided due to the high pulling force which will be accumulated and result in the fiber's breaking up. The high pulling speed results in pool impregnation quality. The pre-heating of CF can improve the pool impregnation quality under high pulling speed. In hot stamping, the pre-consolidation is necessary and the desirable preheating temperature and forming temperature are in the range of 260-280℃ and 130-160℃, respectively.