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    王安正, 关惠元. 塑−木插接节点的配合特性及参数优化[J]. 北京林业大学学报, 2019, 41(11): 137-145. DOI: 10.13332/j.1000-1522.20190226
    引用本文: 王安正, 关惠元. 塑−木插接节点的配合特性及参数优化[J]. 北京林业大学学报, 2019, 41(11): 137-145. DOI: 10.13332/j.1000-1522.20190226
    Wang Anzheng, Guan Huiyuan. Connection characteristics and parameter optimization of plastic-wood insert joint[J]. Journal of Beijing Forestry University, 2019, 41(11): 137-145. DOI: 10.13332/j.1000-1522.20190226
    Citation: Wang Anzheng, Guan Huiyuan. Connection characteristics and parameter optimization of plastic-wood insert joint[J]. Journal of Beijing Forestry University, 2019, 41(11): 137-145. DOI: 10.13332/j.1000-1522.20190226

    塑−木插接节点的配合特性及参数优化

    Connection characteristics and parameter optimization of plastic-wood insert joint

    • 摘要:
      目的塑料与木材的插接连接是塑料椅类家具中一种常见的节点形式,对节点的配合参量进行优化设计能够有效地提高节点接合强度,从而提升产品的可靠性。
      方法以PP塑料与榉木圆榫接合构件为例,选择塑料件壁厚、接合长度、过盈配合量为考察因素,以抗拔强度与抗弯强度为评价指标,采用3因素3水平的Box-Behnken响应面设计法,建立接合强度与配合参数之间的数学模型,通过方差分析各因素的显著性及交互作用,同时通过求解拟合方程获得节点的最优配合参量。并在此基础上对过盈、胶合和木螺丝3种不同装配方式的构件节点抗拔力进行对比分析。
      结果3个因素均对节点的抗拔强度有显著影响,但只有塑料件壁厚和接合长度这两个因素对节点的抗弯强度有显著影响,与过盈配合量无关。直径为40 mm的圆榫塑−木插接节点的最优配合参数为:塑料件壁厚3.2 mm,接合长度50 mm,过盈配合量0.15 mm,对此参数节点进行力学性能试验可获得极限抗拔力2 139.3 N及弯曲载荷1 306.4 N。3种不同装配方式的构件节点抗拔力分别为:过盈装配(Ⅰ型节点)966.5 N < 胶合装配(Ⅱ型节点)1 251.4 N < 木螺丝装配(Ⅲ型节点)1 607.6 N。
      结论塑−木插接节点的配合参数可以通过响应面法优化设计以获得最佳力学性能,在实际应用中各设计因素在设计域内靠近上限取值较易获得最大接合强度,此外采用木螺丝的装配方式能够大大提高节点的抗拔强度。

       

      Abstract:
      ObjectiveThe insert connection mode between plastic and wood is a common joint form in plastic chair furniture. Optimal design of joint parameters can effectively improve joint strength, thus enhancing the reliability of products.
      MethodPP plastic and beech jointed by round tenon was put forward as an example, the wall thickness of plastic part, inserting length and interference fit were selected as the observing factors, and the tensile strength and bending strength were taken as evaluation indexes. A three-factor and three-level Box-Behnken response surface design method was used to establish a mathematical model between joint strength and matching parameters. The significance and interaction of each factor were analyzed by analysis of variance, and the optimal assembling and matching parameters of the joint were obtained by solving the regression equation. On this basis, the comparative analysis of the withdrawal forces of joints was carried out between three different assembly forms interference assembly, gluing assembly and wood screw assembly.
      ResultThe results showed that the three design factors had significant effects on the tensile strength of the joints, but only the wall thickness of plastic parts and the depth of insertion had significant effects on the bending strength of the joints, and had nothing to do with the interference fit. The optimum matching parameters of 40 mm round tenon-wood joints were as follows: the wall thickness of plastic parts was 3.2 mm, the depth of joints was 50 mm, and the interference fit was 0.14 mm. Under this condition, the ultimate withdrawal force and the load of bending of joints were 2 139.3 N and 1 306.4 N. In addition, the withdrawal force of the joints with three different assembly methods was as follows: the interference assembly (type I joint) was 966.5 N < the glued assembly (type II joint) was 1 251.4 N < the wood screw connected assembly (type III joint) was 1 607.6 N.
      ConclusionThe matching parameters of the plastic-wood insert joint can be optimized by the response surface method to obtain the best mechanical properties. In practical application, it is easy to obtain the maximum joint strength when the design factors are close to the upper limit in the design domain. In addition, the use of wood screws can greatly increase the tensile strength of the joints.

       

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