Abstract: In order to obtain the physical characteristics of rootstock  and analyze the cutting principle of the cutting device of flat stubble machine, based on ANSYS LS-DYNA software, the finite element model of apple stock cutting device was established to study the relationship between working parameters and blade parameters during apple seedling cutting. Cutting force and cutting power were taken as indicators. Optimization results of Design Expert dynamic response software were adopted. When the cutting speed was 4 200 r·min^-1, the forward speed was 1 km·h^-1 and the number of teeth was 100, the cutting power of a single group was 1.801 kW, which provided the basis for apple seedling flat stubble cutting device. In the trial production of apple seedling stubble machine, the qualified rate in the field test was higher than 95%, meeting the agronomic requirements of flat stubble. This research of apple seedling flat stubble cutting device was of great significance to realize the mechanization of apple seedling flat stubble.

Key words: apple seedlings stubble machine, circular saw cutter, dynamics simulation

摘要： 为获取砧木物理参数，分析平茬机切割装置切割原理，基于ANSYS LS-DYNA软件建立苹果砧木切割装置有限元模型，研究苹果苗木切割过程中工作参数与刀片参数的关系，以前进速度、锯盘齿数、切割转速为因素，以切割力和切割功率为指标，采用Design Expert动态响应软件优化结果切割器转速为4 200 r·min^-1，前进速度为1 km·h^-1，齿数为100齿数时，单组切割功率为1.801 kW，为苹果苗木平茬切割装置提供依据。试制苹果苗木平茬机，田间试验合格率高于95%，满足平茬的农艺要求。苹果苗木平茬切割装置的研究对实现苹果苗木平茬机械化具有重要意义。

关键词: 苹果苗木平茬机, 圆盘锯式切割器, 动力学仿真