Liang Jintao, Song Xiaotian, Wang Kaixin, Han Xiaolan
School of Mechano-Electronic Engineering, Xidian University, Xi'an 710126, China.
College of Mechanical Engineering, Xi'an Shiyou University, Xi'an 710065, China.
Sensors (Basel). 2024 Dec 8;24(23):7847. doi: 10.3390/s24237847.
The precise measurement of inner dimensions and contour accuracy is required for deep-hole parts, particularly during the manufacturing process, to monitor quality and obtain real-time error parameters. However, on-machine measurement is challenging due to the limited inner space of deep holes. This study proposes an automatic on-machine measuring apparatus for assessing inner diameter, straightness, and roundness errors. Based on the axial-section measurement principle, an integrated measuring module was designed, including a self-centering mechanism, a diameter measuring sensor, and a positioning reference sensor, all embedded within a control system. On this basis, calculations of the inner diameter, and evaluations of the straightness and roundness errors are presented. Experimental verification is conducted on a blind deep hole with a nominal 100 mm inner diameter and 700 mm depth. Compared with measurements performed on a coordinate measuring machine (CMM), which is limited to a maximum hole depth of 300 mm, the proposed apparatus achieved full-depth on-machine measurements. Meanwhile, the measurement results were consistent with the data obtained by the CMM. The straightness error is considered less than 0.05 mm, and the roundness error is considered less than 0.015 mm. Ultimately, without requiring any additional reference platform, the proposed apparatus shows promise for measuring deep-hole parts on various machine tools, with diameters of no less than 80 mm and theoretically unlimited hole depth.
对于深孔零件，尤其是在制造过程中，需要精确测量其内部尺寸和轮廓精度，以监控质量并获取实时误差参数。然而，由于深孔内部空间有限，在位测量具有挑战性。本研究提出了一种用于评估内径、直线度和圆度误差的自动在位测量装置。基于轴向截面测量原理，设计了一个集成测量模块，包括一个自动定心机构、一个直径测量传感器和一个定位参考传感器，它们都嵌入在一个控制系统中。在此基础上，给出了内径的计算方法以及直线度和圆度误差的评估方法。对一个内径标称值为100 mm、深度为700 mm的盲孔进行了实验验证。与坐标测量机（CMM）相比，其最大孔深限制为300 mm，所提出的装置实现了全深度在位测量。同时，测量结果与CMM获得的数据一致。直线度误差被认为小于0.05 mm，圆度误差被认为小于0.015 mm。最终，所提出的装置无需任何额外的参考平台，对于在各种机床上测量直径不小于80 mm且理论上深度不受限的深孔零件具有应用前景。
