发动机缸体结合面孔位置度测量方法的研究  

Study on position measurement method for the holes in engine block

作　　者：王鹏[1] 石永强[1] 孙长库[1] 

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072

出　　处：《仪器仪表学报》2013年第1期51-56,共6页Chinese Journal of Scientific Instrument

基　　金："高档数控机床与基础制造装备"科技重大专项(2009ZX04014-092)资助项目

摘　　要：发动机缸体结合面倒角孔加工和测量时,其基准为底面及其上的2个定位销孔。由于倒角孔及其基准不在同一平面上,混合使用多个线阵及面阵CCD(charge-coupled device)对倒角孔和定位销孔分别成像,提出了用于孔位置度测量的高精度空间坐标转换算法。最终系统测量数据与作为基准的CMM(coordinate measuring machine)测量数据比对,孔位置最大偏差值为0.030 mm,测量相对误差优于0.03%,测量数据标准差误差小于0.015 mm,在95%置信水平下,系统测量不确定度小于±0.035 mm,系统测量时间小于3 min。在工业现场的大量实验结果表明,提出的倒角孔位置度测量方法能够满足生产线上发动机缸体结合面孔组位置度测量的需要。During the manufacturing and measuring process of the chamfered holes in engine block, the bottom plane and two pinholes in the plane are firstly machined as the datum of the block. Because the chamfered holes and the datum are not in the same plane, the proposed method adopts mixed multiple linear and area CCD （charge-coupled device） to obtain the images for the chamfered holes and the pin holes, respectively; then a high precision space coordinate transformation algorithm is proposed, which is applied in the hole position measurement. The system measurement results and the CMM （coordinate measuring machine） measurement results used as the standard data are compared; the maximum hole position error of the measurement system is 0.030 mm and the relative error is better than 0.03%. The standard deviation of the measurement data is less than 0.015 ram. With the confidence level of 95% , the system measurement uncertainty is less than ±0.035 mm. The system measurement time is less than 3 min. Plenty of experimental results obtained in industrial field show that the position measurement method of chamfered holes proposed in the paper can meet the measurement requirements of the holes in engine block in production line.

关 键 词：位置度测量 坐标转换 发动机缸体 

分 类 号：TP242.6[自动化与计算机技术—检测技术与自动化装置]