碳纤维增强热塑性复合材料盒形件热冲压成型研究

Hot Stamping of Carbon Fiber-Reinforced Thermoplastic Composite Boxes

碳纤维增强热塑性复合材料型材传统成型工艺存在操作复杂、成型效率低、成本高、不适合大批量生产等问题,限制其在航空航天领域的大规模应用。为改善成型工艺,提出一种采用模具直接加热纤维增强复合材料板的热冲压成型方法,通过板料拉伸试验和盒形件热拉深成型试验,研究纤维铺向工艺参数以及分析成型过程中试件纤维变形,得出极限拉深深度及成型极限剪切角。针对纤维编织复合材料盒形件热冲压成型,建议采用坯料纤维经纬方向与模具直边平行的放置方式。

Traditional forming processes of carbon-fiber reinforced thermoplastic composite profiles have many problems, such as the complex operation, low forming efficiency, high cost and incapability for mass production, which limit the large-scale applications of composites in the aerospace engineering. A new forming process is proposed, by the direct hotstamping of a fiber-reinforced composite panel using an instant heating deep-drawing die. Through the tensile tests of composite panels and hot stamping of the composite square-cup parts, the influences of fiber orientation on the stamping processing and fiber deformation within the specimens are studied, with the ultimate drawing depth and forming shear angle obtained. For better forming quality, it is suggested to adopt the parallel arrangement of the fiber orientation and the straight edge of the die for the hot stamping process of fiber-woven composite box parts.