微细铣刀位姿同轴全息重建方法

微细铣刀在主轴上存在装夹偏角时,会加剧刀刃磨损,降低刀具使用寿命.为了精确观测微细铣刀在机倾斜状态,提出了基于景深的微细铣刀三维位姿重建方法.利用激光同轴数字全息实验装置得到微细铣刀全息图,并通过菲涅尔再现算法获得再现像.在再现像中提取刀具边缘点作为关键点,采用小波变换局部方差算子求出关键点的聚焦程度,确定铣刀对应的轴...

Coaxial holographic reconstruction method of micro-milling tool pose

When a micro-milling tool has a clamping angle on its spindle,the wear of the tool edge will ac-celerate and shorten the tool’s lifespan.In order to accurately observe the inclination state of the micro-milling tool on the machine,a three-dimensional pose reconstruction method based on the depth of field of a micro-milling tool is proposed.The laser coaxial digital holographic experimental device is used to obtain the micro-milling tool hologram,and the reconstruction image is obtained through the Fresnel reconstruction al-gorithm.The tool edge points are extracted as the key points in the reconstruction image,the wavelet trans-form local variance operator is used to obtain the degree of focus of the key points,and then the axial posi-tion corresponding to the milling tool is determined.The least square method is used to fit the key points and correct the reconstruction error,from which the three-dimensional pose reconstruction of the micro-milling tool is realized.The experimental results show that the reconstruction error of the micro-milling tool ob-tained by the three-dimensional pose reconstruction method is better than 0.1°.This method can accurately measure a three-dimensional pose of a micro-milling tool,which can provide a reference for the subsequent correction of micro-milling tool clamping accuracy.