苎麻机械剥制试验与工艺参数优化

Experiment on ramie peeling machine and process parameters optimization

苎麻剥制工艺参数是剥麻机设计与力学分析的基础。为提高剥麻机剥制质量和效率,论文针对剥麻机切削机构运动和力学特点,在自行设计的苎麻剥制机上进行了试验,对麻皮基本工艺参数、麻皮机械物理特性、切削机构动力参数对剥制质量和生产效率的影响关系进行了试验测定和优化分析。试验结果表明:随着正压力增大,纤维含杂率和含胶率降低,麻纤维质量得到提高,但损失率增加。麻皮切削速度加大有利于提高工效,但纤维质量有所下降,损失率增加。对剥制质量和工效的综合影响分析显示,切削机构刀具正压力和相对速度的最佳取值分别为220N和0.6m/s,而滑动摩擦系数,麻壳剪切强度,麻壳及纤维的厚度压缩比等工艺参数可为剥麻机切削机构的设计提供重要依据。

The process parameters for ramie peeling are the fundamental guarantee for peeling machine design and mechanical analysis. According to the characteristics of mechanical and cutting mechanism movement of peeling ramie machine, ramie peeling experiment was designed and carried out for improving the peeling quality and efficiency. The authors determined the basic process parameters, the mechanical and physical properties of ramie bark and analyzed the relationship of those parameters with peeling. The experimental results showed that with the pressure increasing, the contents of the trash and colloid in fibers were reduced, and the quality of ramie fibers was improved, but the loss rate was increased. The increase of cutting velocity of ramie bark would help improving work efficiency, but the quality of ramie fibers, however, was significantly reduced and the loss rate was increased. The analysis of the effects on peeling quality and production efficiency showed that the best value of the positive pressure and the cutting velocity were 220 N and 0.6 m/s, respectively. The processing parameters such as sliding friction coefficient, the shear strength of ramie shell and the thickness compression ratio of ramie shell and fiber were the important references for cutting mechanism design of the ramie peeling machine.