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以窄腔翻边复合材料蒙皮为研究对象,采用热压罐成型工艺方法,根据零件结构形式,分析窄腔成型质量。结果表明:选取Invar钢框架模成型,能够减少固化中热容带来的残余应力释放,减少零件变形;固化过程中,让树脂充分流动和浸润,满足孔隙率要求,成型后零件的孔隙率小于1.5%。零件外形分析结果表明:设计辅助芯模成型、固化复合材料翻边蒙皮操作的铺贴方向和铺贴手法,以及对零件进行预压实,能保证翻边处外形、轮廓度、R角成型质量要求。利用温差补偿技术,探索升温速率对零件力学性能和树脂含量的影响。结果表明:最佳的升温速率为在玻璃化转变温度(T_g)前保持0.5~1.5℃/min,在玻璃化转变温度T_g至保温前选取升温速率为1.5~2.2℃/min至保温。
The narrow flange cuff composite skin was taken as the research object, and the autoclave forming process was adopted. According to the structure of the part, the forming quality of the narrow cavity was analyzed. The results show that the Invar steel frame molding can reduce the residual stress release caused by the heat capacity during curing and reduce the deformation of the parts. During the curing process, the resin is fully flowed and infiltrated to meet the porosity requirements. The porosity of the parts after molding is less than 1.5%. The results of part shape analysis show that the design of the auxiliary core molding, the curing operation of the composite material flanging skin paving direction and laying practices, as well as the pre-compaction of the parts to ensure that the flange shape, profile, R angle molding Quality requirements. The use of temperature compensation technology to explore the heating rate on the mechanical properties of parts and resin content. The results showed that the optimum heating rate was kept at 0.5-1.5 ℃ / min before the glass transition temperature (T_g), and the temperature rising rate was 1.5-2.2 ℃ / min before the glass transition temperature T_g to keep warm.