玉米根茬铲切刀具的滑切刃曲线优化设计

为获得具有优良切割性能的刀具刃口曲线,采用理论建模和铲切试验相结合的方法,研究了玉米根茬铲切的过程.通过建立玉米根茬切割过程的动力学模型及能耗模型,揭示了最优滑切角与物料摩擦角之间的函数关系；根据玉米根体的结构特征将其划分为5区段,并由各区段物料的摩擦系数获取相应理论最优滑切角；根据切割刃与根茬切割位置的对应关系,设计出具有多级滑切角的刃口形式,并与具有固定滑切角的刃口实施了对比铲切试验.试验表明:多级滑切刃刀具的铲切性能最佳,铲切功耗为14.2 J.

Optimization design of sliding cutting edge curve of corn rootstalk cutting tool

In order to improve the cutting performance of blades, a study was made on the cutting process of corn rootstalk. By the use of theoretical analysis and cutting test experiment, the cutting dynamic model and energy consumption model were established, and the relationship between optimized sliding-cutting angle and friction angle was revealed. According to the friction properties of corn rootstalk, corn rootstalk profile was divided into 5 region, the friction coefficients of every region was measured, and the optimized sliding-cutting angles of every 5 region was determined. At last, the blade with multilevel sliding cutting angle was designed, and compared with the traditional blades with fixed sliding cutting angle. The cutting test result showed that cutting energy consumption of blade with multilevel sliding cutting angle was the lowest, which was 14.2 J.