CN111016396A - 一种碳纤维蜂窝芯材节点胶接方法 - Google Patents
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Abstract
本发明是一种碳纤维蜂窝芯材节点胶接方法,该方法选择半六边形碳纤维片材,在其节点位置间隔涂抹芯条胶,将涂抹芯条胶的半六边形碳纤维片材组合后在胶接工装中加热加压固化,制得碳纤维蜂窝芯材。本发明提出了一种碳纤维蜂窝芯材节点胶接方法及胶接工装,简化了工艺过程,提高了制造效率,且蜂窝幅面尺寸不受限制。
Description
技术领域
本发明是一种碳纤维蜂窝芯材节点胶接方法,属于特种蜂窝制备技术领域。
背景技术
蜂窝芯材与面板结合制成夹层结构复合材料后可提高结构的刚度和抗冲击性能,同时降低结构重量,芳纶纸蜂窝和铝蜂窝在航空航天、轨道交通等领域得到了广泛的应用,碳纤维蜂窝芯材与芳纶纸蜂窝和铝蜂窝相比具刚高的强度和模量。专利CN 104842593 B提出了一种碳纤维蜂窝结构及其制备方法,该专利主要陈述了半六边形碳纤维子件的成型工艺及方法,未提及碳纤维蜂窝节点位置的粘接如何施加压力,没有压力的保证很难保证蜂窝芯材的节点强度,且该方法无法进行连续生产。专利CN 105946246 A提出一种碳纤维蜂窝芯材的制备方法,该专利采用半六边形模具和六棱柱芯模,在热压机中对蜂窝进行一体成型,该方法虽然避免半六边形子件的二次固化胶接,但是存在以下几个问题:(1)每一个蜂窝孔格均需要一个六棱柱芯模,制作一块蜂窝芯材需要数量巨大的芯膜,芯模的安装和拆卸需要耗费大量时间;(2)碳纤维蜂窝芯材成型后芯模与孔格贴合紧密,芯模高度较大时脱模存在较大难度,脱模过程中易造成蜂窝损伤,限制现在蜂窝芯材尺寸。
发明内容
本发明正是针对上述现有技术中存在的不足而设计提供了一种碳纤维蜂窝芯材节点胶接方法,其目的是保证蜂窝节点胶接质量,同时避免芯模脱模困难的问题,而且蜂窝可连续胶接,幅面尺寸不受限制。
本发明的技术解决方案是:
该种碳纤维蜂窝芯材节点胶接方法是以成型法制备碳纤维蜂窝芯材,其特征在于:该方法的步骤如下:
步骤一、在第一层半六边形碳纤维片材3外表面的同一水平面的节点位置处均匀涂抹胶粘剂5,将第一层半六边形碳纤维片材3与第二层半六边形碳纤维片材31组合,在第一层半六边形碳纤维片材3内表面的接合处支撑加压杆4,在第二层半六边形碳纤维片材31内表面的接合处设置模具,通过加热、加压进行预胶接;
步骤二、在第二层半六边形碳纤维片材31外表面的同一水平面的节点位置处均匀涂抹胶粘剂5,将第二层半六边形碳纤维片材31与第三层半六边形碳纤维片材32组合,在第二层半六边形碳纤维片材31内表面的接合处支撑加压杆4,在第三层半六边形碳纤维片材32内表面的接合处设置模具,通过加热、加压进行预胶接;
步骤三、重复步骤二,依次完成第四、第五···第N层半六边形碳纤维片材的预胶接;
步骤四、碳纤维蜂窝芯材预胶接达到需求尺寸后,将加压杆4取出,放入烘箱中按所用胶粘剂5的固化工艺进行固化,得到碳纤维蜂窝芯材。
在一种实施中,所述半六边形碳纤维片材由碳纤维预浸料制成,预浸料的树脂基体为环氧树脂、酚醛树脂、双马来酰亚胺树脂、氰酸酯树脂或聚酰亚胺树脂中的一种。
在一种实施中,所述半六边形碳纤维片材的宽度T=10mm~200mm,边长B=3mm~12mm。
在一种实施中,加压杆4预制二套,分别同时使用在上、下两层的半六边形碳纤维片材3内表面的接合处。
在一种实施中,加压杆4的是正方形柱、长方形柱或正六边形柱,正方形柱、长方形柱或正六边形柱的外接圆直径小于蜂窝内切圆直径。
在一种实施中,所述模具包括加热腔1和上模具2,上模具2的下表面贴合在位于上方的半六边形碳纤维片材内表面的接合处,上模具2的上表面安装加热腔1。
在一种实施中,所述胶粘剂5为环氧树脂、氰酸酯或双马来酰亚胺树脂中的一种。
在一种实施中,碳纤维蜂窝芯材节点固化的压力为0.05Mpa~0.6Mpa,温度为120℃~250℃,保温时间为5min~60min。
本发明具有的优点和有益效果如下:
1本发明采用两套加压杆对碳纤维蜂窝芯材节点位置交替配合模具加压,实现蜂窝连续胶接,且幅面尺寸不受限制,该措施与现有的芯模加压方式相比,在减少模具数量的同时,避免了芯模脱模困难的问题;
2本发明采用的加压杆是逐层对节点处胶粘剂进行加压,相较于芯模加压方式,加压杆的压力更均匀,通过交替可实现连续生产,同时能有效避免碳纤维蜂窝芯材节点位置的出现虚粘、弱粘等问题.
3本发明采用的加压杆可在碳纤维蜂窝芯材节点胶接过程中对半六边形碳纤维片材起到支撑作用,避免胶接过程中半六边形碳纤维片材出现变形。
附图说明
图1为本发明方法中第一、二层半六边形碳纤维片材的胶接示意图
图2为本发明方法中第三及后续半六边形碳纤维片材的胶接示意图
图3为本发明方法中半六边形碳纤维片材及加压杆结构及位置立体示意图
具体实施方式
以下将结合附图和实施例对本发明技术方案作进一步地详述:
实施例1
采用本发明方法对碳纤维蜂窝芯材节点进行胶接的步骤如下:
步骤一、选择中航复材cf3052/5224预浸料所制作的边长为4.5mm的半六边形碳纤维片材若干,T=100mm,在第一层半六边形碳纤维片材3外表面的同一水平面的节点位置处均匀涂抹黑龙江石化院生产的环氧树脂胶粘剂5,胶液固体含量20%-50%。将第一层半六边形碳纤维片材3与第二层半六边形碳纤维片材31组合,在第一层半六边形碳纤维片材3内表面的接合处支撑加压杆4,加压杆4为正六棱柱,边长B为4.0mm。在第二层半六边形碳纤维片材31内表面的接合处设置模具,通过加热、加压进行预胶接,胶接压力为0.2Mpa±0.05Mpa,温度为150℃±5℃,保温时间为15min;如图1、3所示;
步骤二、在第二层半六边形碳纤维片材31外表面的同一水平面的节点位置处均匀涂抹黑龙江石化院生产的胶粘剂5,将第二层半六边形碳纤维片材31与第三层半六边形碳纤维片材32组合,在第二层半六边形碳纤维片材31内表面的接合处支撑加压杆4,加压杆4为正六棱柱,边长为4.0mm。在第三层半六边形碳纤维片材32内表面的接合处设置模具,通过加热、加压进行预胶接,胶接压力为0.2Mpa±0.05Mpa,温度为150℃±5℃,保温时间为15min。;如图2所示;
步骤三、重复步骤二,依次完成第四、第五···第N层半六边形碳纤维片材的预胶接;
步骤四、碳纤维蜂窝芯材预胶接达到需求尺寸后,将加压杆4取出,取出后将蜂窝放入烘箱中,在180℃±5℃下碳纤维固化3h,制得碳纤维蜂窝芯材。
实施例2
采用本发明方法对碳纤维蜂窝芯材节点进行胶接的步骤如下:
步骤一、选择中航复材生产的聚酰亚胺预浸料所制作的边长为5.0mm的半六边形碳纤维片材若干,在第一层半六边形碳纤维片材3外表面的同一水平面的节点位置处均匀涂抹黑龙江石化院生产的聚酰亚胺胶粘剂5,胶液固体含量20%-40%。将第一层半六边形碳纤维片材3与第二层半六边形碳纤维片材31组合,在第一层半六边形碳纤维片材3内表面的接合处支撑加压杆4,加压杆4为正六棱柱,边长为4.0mm。在第二层半六边形碳纤维片材31内表面的接合处设置模具,通过加热、加压进行预胶接,胶接压力为0.3Mpa±0.05Mpa,温度为240℃±5℃,保温时间为30min±5min;如图1所示;
步骤二、在第二层半六边形碳纤维片材31外表面的同一水平面的节点位置处均匀涂抹黑龙江石化院生产的聚酰亚胺胶粘剂5,将第二层半六边形碳纤维片材31与第三层半六边形碳纤维片材32组合,在第二层半六边形碳纤维片材31内表面的接合处支撑加压杆4,加压杆4为正六棱柱,边长为4.4mm。在第三层半六边形碳纤维片材32内表面的接合处设置模具,通过加热、加压进行预胶接,胶接压力为0.3Mpa±0.05Mpa,温度为240℃±5℃,保温时间为30min±5min;如图2所示;
步骤三、重复步骤二,依次完成第四、第五···第N层半六边形碳纤维片材的预胶接;
步骤四、碳纤维蜂窝芯材预胶接达到需求尺寸后,将加压杆4取出,取出后将蜂窝放入烘箱中,在320℃±5℃下碳纤维固化4h,制得碳纤维蜂窝芯材。
实施例3
步骤一、选择中航复材生产的ACTECH@1201/ccf300碳纤维平纹织物预浸料所制作的边长为5.0mm的半六边形碳纤维片材若干,在第一层半六边形碳纤维片材3外表面的同一水平面的节点位置处均匀涂抹黑龙江石化院生产的快速固化胶粘剂5,胶粘剂为氰酸酯体系,胶液固体含量20%-50%。将第一层半六边形碳纤维片材3与第二层半六边形碳纤维片材31组合,在第一层半六边形碳纤维片材3内表面的接合处支撑加压杆4,加压杆4为正方形,边长为4.4mm。在第二层半六边形碳纤维片材31内表面的接合处设置模具,通过加热、加压进行预胶接,胶接压力为0.1Mpa±0.05Mpa,温度为160℃±5℃,保温时间为10min±5min;如图1所示;
步骤二、在第二层半六边形碳纤维片材31外表面的同一水平面的节点位置处均匀涂抹黑龙江石化院生产的胶粘剂5,将第二层半六边形碳纤维片材31与第三层半六边形碳纤维片材32组合,在第二层半六边形碳纤维片材31内表面的接合处支撑加压杆4,加压杆4为正六棱柱,边长为4.4mm。在第三层半六边形碳纤维片材32内表面的接合处设置模具,通过加热、加压进行预胶接,胶接压力为0.1Mpa±0.05Mpa,温度为160℃±5℃,保温时间为10min±5min;如图2所示;
步骤三、重复步骤二,依次完成第四、第五···第N层半六边形碳纤维片材的预胶接;
步骤四、碳纤维蜂窝芯材预胶接达到需求尺寸后,将加压杆4取出,取出后将蜂窝放入烘箱中,在180℃±5℃下碳纤维固化1h,制得碳纤维蜂窝芯材。
Claims (8)
1.一种碳纤维蜂窝芯材节点胶接方法,该方法是以成型法制备碳纤维蜂窝芯材,其特征在于:该方法的步骤如下:
步骤一、在第一层半六边形碳纤维片材(3)外表面的同一水平面的节点位置处均匀涂抹胶粘剂(5),将第一层半六边形碳纤维片材(3)与第二层半六边形碳纤维片材(31)组合,在第一层半六边形碳纤维片材(3)内表面的接合处支撑加压杆(4),在第二层半六边形碳纤维片材(31)内表面的接合处设置模具,通过加热、加压进行预胶接;
步骤二、在第二层半六边形碳纤维片材(31)外表面的同一水平面的节点位置处均匀涂抹胶粘剂(5),将第二层半六边形碳纤维片材(31)与第三层半六边形碳纤维片材(32)组合,在第二层半六边形碳纤维片材(31)内表面的接合处支撑加压杆(4),在第三层半六边形碳纤维片材(32)内表面的接合处设置模具,通过加热、加压进行预胶接;
步骤三、重复步骤二,依次完成第四、第五···第N层半六边形碳纤维片材的预胶接;
步骤四、碳纤维蜂窝芯材预胶接达到需求尺寸后,将加压杆(4)取出,放入烘箱中按所用胶粘剂(5)的固化工艺进行固化,得到碳纤维蜂窝芯材。
2.根据权利要求1所述的种碳纤维蜂窝芯材节点胶接方法,其特征在于:所述半六边形碳纤维片材由碳纤维预浸料制成,预浸料的树脂基体为环氧树脂、酚醛树脂、双马来酰亚胺树脂、氰酸酯树脂或聚酰亚胺树脂中的一种。
3.根据权利要求1所述的种碳纤维蜂窝芯材节点胶接方法,其特征在于:所述半六边形碳纤维片材的宽度T=10mm~200mm,边长B=3mm~12mm。
4.根据权利要求1所述的种碳纤维蜂窝芯材节点胶接方法,其特征在于:加压杆(4)预制二套,分别同时使用在上、下两层的半六边形碳纤维片材(3)内表面的接合处。
5.根据权利要求1或4所述的种碳纤维蜂窝芯材节点胶接方法,其特征在于:加压杆(4)的是正方形柱、长方形柱或正六边形柱,正方形柱、长方形柱或正六边形柱的外接圆直径小于蜂窝内切圆直径。
6.根据权利要求1所述的种碳纤维蜂窝芯材节点胶接方法,其特征在于:所述模具包括加热腔(1)和上模具(2),上模具(2)的下表面贴合在位于上方的半六边形碳纤维片材内表面的接合处,上模具(2)的上表面安装加热腔(1)。
7.根据权利要求1所述的种碳纤维蜂窝芯材节点胶接方法,其特征在于:所述胶粘剂(5)为环氧树脂、氰酸酯或双马来酰亚胺树脂中的一种。
8.根据权利要求1所述的种碳纤维蜂窝芯材节点胶接方法,其特征在于:碳纤维蜂窝芯材节点固化的压力为0.05Mpa~0.6Mpa,温度为120℃~250℃,保温时间为5min~60min。
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