在建立硅橡胶芯模尺寸及工艺间隙设计公式的基础上,采用硅橡胶热膨胀工艺制备了碳纤维/双马树脂复合材料圆管,考察了不同厚度硅橡胶芯模对成型过程温度分布及预浸料铺层内部树脂压力的影响,并分析了圆管的成型质量。结果表明：硅橡胶芯模的厚度对温度分布影响较大,厚度为5mm时,温度分布比较均匀;铺层内的树脂压力能够达到设计压力,但不同位置的加压点和压力大小不同;所制备的碳纤维/双马树脂复合材料圆管表面质量良好,内部没有明显缺陷,且厚度均匀,证明了所设计模具方案的合理性。
The carbon fiber/bismaleimide resin composite circular tubes were processed by the thermal expansion molding using silicone rubber,based on the establishment of the formula for calculating the dimensions of the silicone rubber mandrel and the process gap.The effects of the thickness of silicone rubber mandrel on the distribution of the temperature and resin pressure variation inside the prepreg stack during processing were investigated,and the manufacturing quality of the composite tubes was analyzed.The results show that the thickness of the silicone rubber mandrel strongly influences the distribution of temperature,and the temperatures are more uniform for the silicone rubber mandrel with 5 mm thickness.Moreover,the resin pressures in the prepreg stack can reach the designed values,but the moment of applied pressure and the pressure level are not identical at different locations.In addition,the manufactured carbon fiber/bismaleimide resin composite circular tubes have good surface quality and uniform thickness distribution without obvious defects inside,demonstrating the feasibility of the designed mold scheme.
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