Fruit tree pruning is an important part of orchard management. In this paper, the force on and the wear of the pruner in the pruning process were studied with a canna-leaf biomimetic convex-hull pruner. The pruner was formed by laser etching technology. The influence of laser power and scanning speed on the geometric dimensioning of the micro texture was analyzed. The shear force calculation model was built to obtain the positive pressure load during the pruning process, while the model accuracy was verified in the static pressure shear test, and the wear mechanism was analyzed in the wear test. The real pruning process was simulated to compare the worn areas of the textured and non-textured pruners and the number of cuts in fixed wear condition, for proving the wear reduction characteristics of the micro-textured pruner. The results show that: the optimal forming parameters are 70 W 1.6 mm/s (10 mm-diameter branches), 80 W 2.4 mm/s (15 mm-diameter branches) and 80 W 1.6 mm/s (20 mm-diameter branches), and the convex hull spacing is 300 μm. Laser power affects the depth and width of the texture, while scanning speed affects the depth of the texture. The positive pressure on the pruner is proportional to the modulus of elasticity, moment of inertia, cut depth, and bevel angle, whilst it is inversely proportional to the distance from the fixed point of the blade to the positive pressure. The wear test shows that the anti-wear performance of the textured pruner is not obvious at the load of 300 g, while the anti-wear performance of the textured pruner is significant at the loads of 1000 g and 2000 g. The wear mechanism shifts from the abrasive wear in the early stage to more complex oxidative wear and adhesive wear. The actual shear test shows that the textured pruner wears less than the non-textured pruner and enters the stable shear faster.

中文翻译：

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大麻叶仿生微纹理果树的减摩机理研究

果树修剪是果园管理的重要组成部分。在本文中，使用美人蕉叶仿生凸壳修剪器研究了修剪过程中修剪器的作用力和磨损情况。修剪器是通过激光蚀刻技术形成的。分析了激光功率和扫描速度对微织构几何尺寸的影响。建立了剪力计算模型，以求得修剪过程中的正压载荷，并在静压剪切试验中验证了模型的准确性，并在磨损试验中分析了磨损机理。模拟了实际的修剪过程，以比较纹理化和非纹理化修剪器的磨损区域以及固定磨损条件下的切割次数，以证明微纹理化修剪器的减少磨损特性。结果表明：最佳成形参数为70 W 1.6 mm / s（直径为10 mm的分支），80 W 2.4 mm / s（直径为15 mm的分支）和80 W 1.6 mm / s（直径为20 mm的分支），凸形船体间距为300μm。激光功率会影响纹理的深度和宽度，而扫描速度会影响纹理的深度。修剪机上的正压力与弹性模量，惯性矩，切削深度和锥角成正比，而与刀片固定点到正压力的距离成反比。磨损测试表明，在300 g的负载下，纹理修剪机的抗磨损性能并不明显，而在1000 g和2000 g的负载下，纹理修剪机的抗磨损性能却很明显。磨损机理从早期的磨料磨损转变为更复杂的氧化磨损和胶粘剂磨损。实际的剪切测试表明，带纹理的修枝剪比无纹理的修枝剪磨损少，并且进入稳定剪切的速度更快。