本文根据犁铧表面承受的压力和土壤磨损的情况对耕作时犁铧刃口稳定截面形状的形成过程作了分析;提出了耐磨层在犁铧刃口正面时保持刃口截面形状不变的条件及估计其相对使用寿命的公式;比较了耐磨层在犁铧刃口正面和背面时的优缺点,认为在适当条件下耐磨层在犁铧刃口背后较好。 In this paper, according to the pressure on the ploughshare surface and the soil abrasion, the forming process of the steady section shape of the plowshare during tilling was analyzed. The condition and the estimation of keeping the section shape of the cutting edge unchanged when the wear layer was on the front of the plowhaving edge The relative service life of the formula; compared the wear layer in the plow Hua edge front and back of the advantages and disadvantages, that the wear-resistant layer under the appropriate conditions behind the plow Hua edge better.