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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,第九节 折叠纸盒强度计算,一、折叠纸盒强度,折叠纸盒是用耐折纸板生产的,纸盒强度和纸盒挺度有一定关系,而纸板挺度又取决于纸板厚度及纸板横截面积以及弹性模量、纸板纵横向等。单根木材纤维的弹性模量值为3500MPa。因为多数纤维沿纸机方向排列,所以挺度在纸板机向最大。,图3-169 折叠纸盒强度与厚度关系,a纸板挺度 b载荷 c盒体凸鼓量,二、折叠纸盒强度计算公式,1、BRDA美国纸盒纸板研究开发协会公式,式中 P折叠纸盒抗压强度,N,a常数,DX纸板纵向挺度,mNm,t纸板厚度,mm,在上式中,因为1+Dx/10Dy1,2、Knis Rern式,式中 b常数,3、Daqel&Wessman式,式中 c常数,4、Schret&Verseput式,式中 d常数,【习 题】,3-1 按编号法命名图3-13(b)的各部结构。,3-2 设计正五边形连续摇翼窝进式纸盒。,3-3 设计正六边形连续摇翼窝进式纸盒,但盒底改为自锁结构。,3-4 在图3-69结构中,:1=125,2=55,n=90 求各折叠角。,3-5 将图3-78(a)盒型改成42结构并写出详细设计步骤。,3-6 将图3-79盒型改成42且的P型排列结构并写出详细设计步骤。,3-7 将图3-72(a)盒形改成的Q型排列结构并写出详细设计步骤。,3-8 将图3-83(b)任一间壁板设计到3-84(c)盒型上并写出详细设计步骤。,3-9 设计正六边形环销式组合盒。,3-10 开窗盒盖板位置如何设计,为什么?,3-11 在图2-1中,内尺寸为5020200,纸板计算厚度为0.5,修正系数均为0,求制造尺寸与外尺寸。,3-12 在图3-43中,外尺寸为25015050,纸板计算厚度为1,修正系数均为0,求制造尺寸与内尺寸。,3-13 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