CNC加工动态基准视觉检测新工艺研究

Research on new technology of CNC machining dynamic datum visual inspection

由于CNC加工过程中工序间误差累积,严重影响数控加工精度。为此提出一种CCD视觉检测新工艺来实现加工动态基准的在线检测和误差补偿。研究动态基准的视觉特征提取方法,获取加工基准位置和误差;采用嵌入式控制技术,实现视觉图像的在线采集和处理;视诊测头像普通刀具一样通过标准锥柄安装在加工中心刀库中,通过CNC程序代码实现一体化控制功能。针对汽车关键件的验证,得出视诊测头检测精度达到0.03 mm,与基于触发式测头的CNC在线检测方法相比,检测效率提高近3倍,证明了该检测工艺在检测精度及效率上均能够满足生产线自动化检测需求。

Due to the accumulation of errors between processes during CNC machining,the accuracy of CNC machining is seriously affected.A new CCD visual inspection process is proposed to realize on-line inspection and error compensation of machining dynamic datum.The visual feature extraction method of dynamic datum is studied to obtain the processing datum position and error.The embedded control technology is used to realize the online acquisition and processing of visual images.The same as the ordinary tool of the visual diagnosis probe is installed in the CNC machining center tool magazine through the standard taper shank,through the CNC program code to achieve integrated control functions.For the verification of the key parts of the automobile,the inspection accuracy of the visual diagnosis probe reaches 0.03 mm,and the inspection efficiency is improved by 3 times compared with the CNC on-line inspection method based on the trigger type probe,which proves that the inspection process is accurate in inspection and efficiency.Both can meet the needs of automated inspection of production lines.