复合材料长桁机械成型工艺

复合材料自动化成型技术在提高复合材料生产效率、降低复合材料制造成本等方面都具有明显优势,为了改进传统生产效率低、质量稳定性差的缺点,利用设计的长桁机械成型设备制备预成型制件,研究了预成型速率以及预成型温度等工艺参数对于成型制件质量的影响,通过尺寸测量、金相分析等方法表征制件拐角厚度、纤维体积分数、孔隙率、纤维偏转变形等参数。结果表明:97℃预成型温度、1~3 mm/min预成型速率、90°/45°/0°/-45°]2s铺层方式、2. 99 mm成型间距是较优的成型工艺参数,采用此工艺参数制造的制件厚度均匀、孔隙缺陷少、纤维偏转变形小、质量良好,在铺层表面添加聚四氟乙烯布保护层可以有效改善45°方向铺层出现的纤维偏转变形问题。

Mechanical Forming Process of Composite Stringers

The automation forming technology of composite materials had become the most effective method and simplest approach due to the high efficiency and low cost.For the purpose of improving traditional low production efficiency and poor quality stability,by using self-designed mechanical forming equipment of composite stingers,the effects of process parameters such as the forming rate and forming temperature on the quality of forming parts are studied.The optimum forming parameters for90°/45°/0°/-45°]2 sL-type parts are obtained through characterizing the thickness of the corner,the fiber volume,the porosity and fiber deformation by size measurement and metallographic analysis,i.e forming rate of 1 to 3 mm/min,forming temperature of 97 ℃ when the forming space is 2.99 mm.Under this condition,the parts obtain good quality as uniform thickness,small pore defects and fiber defection.A Teflon cloth protective layer on the surface of the layup can effectively improve the deflection and deformation of the fiber in the45° direction of the surface layer.