木质重组材单板卷曲辊压成型平台设计与试验

    Design and experimental of veneer curling roll forming platform for wooden scrimber

    • 摘要: 低品质木制单板制备重组材是其高值化利用的重要途径,研发连续式重组材成型技术有利于提高其生产效率,对促进木材可持续发展和经济社会绿色发展具有重要意义。该研究设计一种木制重组材单板卷曲辊压成型平台,并以木质管道制备为例对工艺参数进行优化试验研究以测试平台工作性能。设计单板卷曲辊压成型平台的整机机械结构并描述其工作原理,对辊压机构、卷木轴刹车防滑机构、施胶压紧装置等关键部件进行详细设计和理论计算。对物理样机进行性能试验,以芯轴转速、单板厚度、施加压力为试验因素,木质管道的环刚度和轴向压缩强度为试验指标,运用Box-Benhnken试验方法,建立因素与试验指标的回归方程,优化参数组合为芯轴转速16 r/min,单板厚度2.15 mm,施加压力293 N。此时预测木质管道的环刚度为26 016.6 N/m2,轴向压缩强度为23.11 MPa验证环刚度与预测值误差为1.07%,轴向压缩强度误差为4.46%。进一步使用优化参数对内径为5.08、7.62、12.70 cm的木质管道进行试验,得到环刚度分别为43 812、32 655、17 532 N/m2,轴向压缩强度为25.83、24.71、20.17 MPa。该研究成果可为木质重组材卷曲辊压成型技术及装备的工业化应用提供参考。

       

      Abstract: Wood has been one of the important renewable resources with environmental friendliness and recyclability among raw materials. The rotary-cut veneer has been processed from low-quality wood, such as fast-growing poplar. The discontinuous flat-pressing has been commonly used to produce the plywood or the cover material for eco-boards. The low-quality wooden veneers were then reconstituted to realize the high-value utilization. The continuously restructured timber moulding is conducive to the production efficiency and automation level in sustainable timber development. This study aims to design the forming platform of veneer curling and roller pressing for the wooden reconstituted materials. The preparation of wooden-based pipelines was taken as an example. The process parameters were optimized and verified for the performance of the platform. The entire mechanical structure was designed for the veneer curling and roller pressing forming platform. Detailed design and theoretical calculations were performed for the key components, such as the roller pressing, the wood roll shaft braking anti-slip, and the glue application pressing device. The tests were also performed on the physical prototype to validate the rationality and applicability of these components. A 10.16 cm wooden pipe was prepared with the core shaft rotation speed, veneer thickness, and pressure as the test factors, while the ring stiffness and axial compression strength of the wooden-based pipeline as the test indexes. Regression equations between factors and test indexes were established using the Box-Benhnken design. The optimal combination of parameters was then obtained to prepare the wood pipes: the mandrel speed of 16 r/min, veneer thickness of 2.15 mm, and pressure of 293 N. The predicted ring stiffness of the wooden-based pipeline was 26 016.6 N/m2 in this case, and the axial compression strength was 23.11 MPa. Verification tests show that the error between the predicted and actual ring stiffness was 1.07%, and the error of axial compression strength was 4.46%. Furthermore, the better performance was achieved in the wooden-based pipelines with the inner diameters of 5.08,7.62,12.70 cm. Specifically, the ring stiffnesses were 43 812, 32 655, and 17 532 N/m2, respectively, while, the axial compression strengths were 25.83, 24.71, and 20.17 MPa, respectively. Therefore, the forming platform can be effectively applied to prepare the wood pipes. The full utilization of low-quality materials can be realized, such as agricultural and forestry residues. The finding can provide a strong reference and technical support for the industrial application of wooden reconstituted material curling and roller pressing forming and equipment. Particularly, the wood recombinant material can take the low-quality veneer as the raw material. The adhesive and heating device can also be optimized to expand the application scope for high production efficiency.

       

    /

    返回文章
    返回