青饲料收获机切碎辊刀具的优化设计及试验

青饲料收获机切碎辊刀具的设计直接影响秸秆的切割质量。刀具与秸秆接触时的受力分析表明，切割力与秸秆的压应力有关，而压应力不仅与秸秆物理特性有关，也与刀刃的倾斜角有关。利用Ansys-Workbench有限元软件进行仿真分析，结果表明,当刀具材料为65Mn、刀具厚度为8 mm、刀尖倾斜角度为30°时，刀具的等效应力最小。以秸秆层厚度、刀具倾斜角、秸秆含水率为试验因素，以切割装置切割秸秆时的扭矩值为试验指标，通过正交试验及交互作用分析，确定了因素对指标影响的主次关系为：A2>C2>B2>A>BC>AC>C>B，当秸秆层厚度7.5 cm、刀具倾斜角度35°、秸秆含水率35%时，刀辊扭矩值最小。验证试验结果表明选取的较优参数组合真实可行。该研究为新型刀具及防堵刀辊的机理研究提供了理论和试验借鉴。

Optimum Design and Experiment of Cutter of Chopping Roller of Green Forage Harvester

The cutter design of the chopping roller of the forage harvester directly affects the cutting quality of the straw. It was found that the cutting force was related to the compressive stress of straw through the stress analysis of the contact between the cutter and straw, and the compressive stress was not only related to the physical characteristics of straw, but also related to the inclination angle of the blade. The finite element software ANSYS Workbench was used to simulate and analyze, and it was found when the tool material was 65Mn, the tool thickness was 8 mm and the tip inclination angle was 30°, the equivalent stress of the tool was the minimum. Taking the thickness of straw layer, the inclination angle of cutter and the moisture content of straw as the experimental factors, and the torque value when the cutting device cuts straw as the experimental index, through the orthogonal test and interaction analysis, the primary and secondary relations of the factors on the indexes were determined as follows: A2 > C2 > B2 > A > BC > AC > C > B, when the thickness of straw layer was 7.5 cm, the inclination angle of cutter was 35°, and the moisture content of straw was 35%, the torque value of cutter roller was the smallest. The results of verification tests showed that the better combination of parameters was feasible. This study provided a theoretical and experimental reference for the mechanism research of new cutting tools and anti blocking roll.