This paper established the cutting model of blade which is the important part of earth auger, and analysed the relationship between the parameters of geometrical structure and the force of cutting with MATLAB.

• 本文对挖坑机的重要工作零件－刀片建立了其纯切削模型，并运用MATLAB分析了刀片的结构几何参数对切削力的影响关系。