【摘要】 材质轻量化和结构轻量化是降低汽车整质重量的有效途径。其中,质轻且比强度高的纤维增强树脂复合材料已经越来越多的应用于汽车设计和制造中。为解决传统复合材料件成形效率低、制造成本高等问题,进一步扩展复合材料在汽车制造业中的应用,提出一种采用非等温模具对复合材料板直接进行热冲压的复合材料成形新方法。该方法对模具进行非等温加热,使用非等温模具通过接触传热将复合材料中需要发生变形的区域进行局部加热,借助复合材料加热到一定温度下软化的特点,随着模具的运动逐步成形工件,工件在模具作用下固化。进行复合材料板球面形件的热拉深成形试验研究,分析成形温度对试件拉深过程的影响。试验结果表明,碳纤维增强树脂基复合材料具有良好的热冲压性能,成形效率高,成形的球面件质量好,表面光洁。由于树脂软化,拉深过程载荷随着成形温度升高而降低。更多还原

【Abstract】 Materials lightweighting and structures lightweighting are the two effective way of reducing the overall weight of vehicles,in which fiber reinforced composites have increasingly used in automobile design and manufacturing as a result of light weight and high special strength.In order to improve the manufacturing efficiency and reduce the cost for composite parts formed by traditional composite forming processes,a non-isothermal mould stamping method is proposed to directly form a composite part.The mould is locally heated up to a specified temperature,and then the deformation regions of the composite sheets are heated up to a preassigned temperature by contact heat transfer with die.Taking advantage of the resin matrix becoming soft after being heated to a certain temperature,the heated sheets are formed gradually by the die movement,and then solidified in the cooling die.Thermal deep drawing experiments of a group of hemisphere composite parts are conducted and the effect of forming temperature on stamping process is analyzed.Results show that carbon fiber composite sheets have good stamping performance and good sphere quality.The stamping process has high forming efficiency and as a result of softening of resin,in the deep drawing process,stamping load deceases with the increasing of forming temperature.更多还原