双螺旋旋耕埋草模型刀辊横刀刃口螺旋线的逆向重构  

Reverse reconstruction for cutting edge curve of spiral horizontal knife on the model of double spiral rotary tillage and stubble-mulch roller

作　　者：卢元爽[1] 张国忠[1] 周勇[1] 汲文峰[1] 李兆东[1] 李怡[1] 

机构地区：[1]华中农业大学工学院,武汉430070

出　　处：《华中农业大学学报》2014年第3期115-121,共7页Journal of Huazhong Agricultural University

基　　金：国家自然科学基金项目(50975115;51275196);国家公益性行业计划项目(201203059);中央高校基本科研业务费专项(2013PY123;2014PY043)

摘　　要：采用相似法研究双螺旋旋耕埋草刀辊对土壤的切削特性,根据相似原理设计并制作了与原型刀辊比例为1∶2的旋耕埋草模型刀辊。为检验模型刀辊横刀螺旋线是否存在制造误差,基于逆向工程技术,以模型刀辊的横刀组为对象开展了三维形状的重构研究。以端面横刀侧平面为基准平面,利用FD-Y685型三坐标测量机对螺旋横刀组进行了扫描,利用CATIA V5软件对所获取的云图进行了导入和过滤处理,借助MATLAB软件以过滤后的云图测量数据为依据对横刀刃口螺旋线进行反求。结果表明:横刀刃口螺旋线上各测量点与对应理论反求点之间距离最大值为6.016mm、最小值为0.624mm、平均值为3.243mm;各测量点与对应反求点间最大伸长率5.2%,最小伸长率0.6%,平均伸长率3.6%;三维逆向重构作为一种测量技术可用于农业装备形状的精确测量、反求与重构。In order to optimize the mechanism of the cutting feature of horizontal knife in the soil straw mixture,the similitude method was used to research the cutting process and a model rotary knife roller was designed whose proportion was 1∶2as real roller.In order to find whether there is a manufacturing error of the model,a three dimensional reconstruction experiment was carried out on the model roller with reverse engineering techniques.The model spiral horizontal knife and bend knife were scanned by the FD-Y685type three coordinate measuring machine with the side surface of the horizontal knife as the datum plane.The point cloud was obtained and filtered by CATIAV 5software.The point cloud data were processed with Matlab software.On the basis of that,the spiral curve of the horizontal knife was reconstructed reversely.The results indicated that the maximum distance between those measurement points and theirs reverse points was 6.016mm,and the minimum distance was 0.624mm,the average distance was 3.243 mm.The maximum relative error rate between measurement points and theirs reverse points was 5.2%,while the minimum relative error rate was 0.6%and the average relative error rate was 3.6%.Reverse reconstruction was an advanced technology with high precision which was able to accurately measure and reconstruct agricultural equipment shape,especially complicated shape.

关 键 词：农业机械 螺旋刀辊 逆向工程 重构 

分 类 号：S233.71[农业科学—农业机械化工程]