z-pin结构细木工饰面板抗翘曲变形性能

Structural design and warping resistance of z-pin decorative blockboards

细木工板作为室内装修和高档家具定制的基础材料,要求其具有美观的外表,同时还要求其具有较强的抗变形性能。为了提高细木工板抗变形的能力,根据复合材料z-pin结构设计理论,将竹条(板)按照不同的排列顺序嵌入细木工板芯板内,设计了A、B、C 3种z-pin结构细木工板,3种z-pin结构中横向竹条的间距分别为105,155,225 mm。测量无约束自然状态下整幅面板材上的弯曲变形和应变,结果显示:3种z-pin结构板整体的平均变形量与对照板相比,左、右边缘及中心线处的纵向弯曲拱高分别降低了47.88%,43.62%和48.28%,左、右对角线处分别降低了46.86%和53.09%;横向自上到下5点弯曲拱高分别降低了54.03%,51.67%,45.44%,39.14%,31.31%。板材横、纵两个方向仍存在弯曲应变,同一板材不同测量部位的最大应变位于板材上端,A结构板的整体应变最小,测量结果与人工测量结果吻合。力学测量结果显示:抗弯试件的破坏载荷、静曲强度、弹性模量、抗弯刚度试验值与理论值均有所提高。因此,z-pin结构板材抗翘曲变形能力也得到有效增强,其中,A结构板抗变形性能在3种z-pin结构板材中最佳。

As a type of basic materials for interior decoration and high-end furniture customisation,blockboard has been accepted by the furniture market because it has not only an aesthetically pleasing appearance,but also a strong resis-tance to deformation.In order to improve the ability of the blockboard to resist deformation,according to the theory of composite material z-pin structure design,bamboo strips(boards)were embedded into the core of the blockboard in different order of arrangement.Three types of z-pin structure blockboards,A,B,and C,were designed.The horizontal spacings of bamboo strips in the three z-pin structures were 105,155 and 225 mm,respectively.The bending deformation and strain on the entire panel material in an unconstrained natural state were measured.The results showed that the maximum bending deformation of the transverse z-pin reinforced joinery occurred at the upper part of the pa-nel.The average deformations of the three z-pin structured joinery panels were reduced by 49.58%,30.59% and 27.03%at the transverse measurement points,respectively,compared to the control panel.The longitudinal deformations were reduced by 56.22%,43.82% and 34.90%,respectively,compared to the control panel.The strain mea-surement results showed that there was static strain at the edge of the plate,making the microscopic changes at the edge slightly wavy.The strain was in the order of control panel>Panel C>Panel B>Panel A.Through the three-point bending experiment,the damage load,static bending strength,elastic modulus and bending stiffness of the transverse bending specimen increased by 18.75%,4.82%,5.09% and 5.01%,respectively,while the damage load,static bending strength,elastic modulus and bending stiffness of the longitudinal bending specimen increased by 9.83%,3.18%,2.21% and 2.61%,respectively.A comparison of the longitudinal bending deformation and transverse bending deformation of the control panel with the three z-pin structural panels revealed that the overall deformation of the control panel was greater than that of the three types of z-pin structural panels,indicating that the embedded bamboo strips helped to suppress the longitudinal and transverse bending deformation of the joinery.The results of the mechanical measurements showed that the test values of the breaking load,static flexural strength,modulus of elasticity and flexural stiffness of the flexural specimens were increased compared to the theoretical values.As a result,the resistance to warpage and deformation of the z-pin structural panels was also effectively enhanced.Panel A had the best deformation resistance among the three types of z-pin structure blockboards.