[Objective]To design a disc-cutter type no-till maize seeder equipped with a micro tillage machine,and solve the problems that the no-till seeder has difficulties in passing through the field and has unsatisfactory seeding quality in the southwest area of China with heavy clay soil and relatively small field area.[Method]Disc knife and walking device with depth wheel were applied to break stubble and ditch,limit depth and prevent skidding.The effects of flat,corrugated and notched disc knife operations on stubble breaking,traction resistance and fuel consumption were investigated.Soil cut with three types of cutting discs was simulated by LS-DYNA and the key parameters were designed.[Result]The field test showed that the soil disturbance quantity and fuel consumption of the no-tillage seeder equipped with flat cutting disc were about 4.03％and 14.64％lower than those of the corrugated type,respectively,and 1.15％and 7.51％lower than those of the notched type.The traction resistance reached the minimum value of 1.2 kN at the speed of 0.54 m·s–1.The qualified rates of seeding and fertilizing depth with three types of cutting discs were above 85％and the qualified index of seed spacing was 90.3％.[Conclusion]This study provide the design basis for the no-tillage seeder with disc cutter in the southwest of China.%[目的]为解决我国西南地区土壤黏重,田块面积相对较小,现有免耕播种机作业时机具通过性差,播种质量难以保证等问题,设计一种微耕机配套的圆盘刀式玉米免耕播种机.[方法]应用圆盘刀与限深轮行走装置具备的破茬开沟、限深防滑功能,研究对比播种机平面、波纹与缺口圆盘刀作业时对破茬、牵引阻力和油耗等的影响;通过LS-DYNA对3种类型圆盘刀切割土壤过程进行仿真模拟,并实现关键参数的设计.[结果]田间试验结果表明,配置平面圆盘刀的免耕播种机土壤扰动量、油耗较波纹圆盘刀分别低4.03％和14.64％;较缺口圆盘刀分别低1.15％和7.51％;牵引阻力在0.54 m·s–1时最低,为1.20 kN;使用3种类型圆盘刀的种肥深度合格率达85％以上,粒距合格指数为90.3％.[结论]本研究可为西南地区圆盘刀破茬的免耕播种机设计提供依据.
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