摘要
针对背负式割草机刀盘轻量化设计问题,选取市场上常见的2、3、40齿锰钢刀盘进行研究。首先运用3维机械制图软件PTC/Creo对刀盘进行数字模型绘制,其次基于拓扑优化变密度法和杂草刈割试验,在6000 r/min极限转速工况下对刀盘结构进行计算机拓扑优化,并对优化前后刀盘应力进行受力分析,3种刀盘优化后质量依次减轻27.5%、10.24%和12.71%,而极限受力大小依次减小11.3%、0.8%和6.8%,得出刀盘质量减轻百分比大于极限受力减小百分比的结论。优化后刀盘模态频率有所增加,抗振性能增强。最后通过田间割草对比试验验证3种刀盘结构优化后割草性能符合行业要求,并得出重割率与刀盘齿数呈正相关,漏割率与刀盘齿数呈负相关的结论。
We studied the lightweight design of common manganese-steel cutting discs（teeth number：2,3,or 40） of shoulder-carrying mower.Firstly,we used three-dimension mechanical map-making software PTC/Creo to draw the digital model of cutting discs.Then,based on the topological optimized variable density method and weed-cutting test,we optimized the structure of cutting discs at maximum rotation speed（6000 r/min） by using computer topology,and analyzed the stress on cutting discs before and after the optimization.After the optimization,the mass of 3 types of cutting discs decreased by 27.5%,10.24% and 12.71%,respectively,and their maximum stress decreased by 11.3%,0.8% and 6.8%,separately,indicating that the decrease percentage of cutting disc mass was bigger than that of its maximum stress.In addition,the modal frequency and shock-resistance of cutting discs after the optimization were better than those before the optimization.Finally,the orchard weed-cutting comparative test confirmed that the weed-cutting performance of shoulder-carrying mower with the structure-optimized cutting discs accorded with the industrial demand; it was concluded that the repeat cutting rate was positively correlated with the teeth number of cutting disc,whereas the miss cutting rate was negatively correlated with the teeth number of cutting disc.
出处
《江西农业学报》
CAS
2018年第1期101-107,共7页
Acta Agriculturae Jiangxi
基金
国家梨产业技术体系(CARS-29-19)
江苏省农业自主创新资金项目[CX(15)1034]
关键词
背负式割草机
刀盘
受力分析
拓扑优化
Shoulder-carrying mower
Cutting disc
Stress analysis
Topology optimization
