Zhang Huayu, Zhong Mingming, Xie Fengqin, Cao Maoyong
College of Mechanical and electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
College of Transportation, Shandong University of Science and Technology, Qingdao 266590, China.
Sensors (Basel). 2017 Dec 5;17(12):2814. doi: 10.3390/s17122814.
Steel ball surface-defect inspection was performed by using a new saddle-type eddy current sensor (SECS), which included a saddle coil and a signal conditioning circuit. The saddle coil was directly wound on the steel ball's outer bracket in a semi-circumferential direction. Driven by a friction wheel, the test steel ball rotated in a one-dimensional direction, such that the steel ball surface was fully scanned by the SECS. There were two purposes for using the SECS in the steel ball inspection system: one was to reduce the complexity of the unfolding wheel of the surface deployment mechanism, and the other was to reduce the difficulty of sensor processing and installation. Experiments were carried out on bearing steel balls in diameter of 8 mm with three types of representative and typical defects by using the SECS, and the results showed that the inspection system can detect surface defects as small as 0.05 mm in width and 0.1 mm in depth with high-repetition detection accuracy, and the detection efficiency of 5 pcs/s, which meet the requirement for inspecting ISO grade 10 bearing steel balls. The feasibility of detecting steel ball surface defects by SECS was verified.
采用一种新型鞍式涡流传感器（SECS）对钢球表面缺陷进行检测，该传感器包括一个鞍形线圈和一个信号调理电路。鞍形线圈沿半圆周方向直接缠绕在钢球的外支架上。在摩擦轮的驱动下，被测钢球在一维方向上旋转，从而使钢球表面被SECS完全扫描。在钢球检测系统中使用SECS有两个目的：一是降低表面展开机构展开轮的复杂性，二是降低传感器处理和安装的难度。利用SECS对直径8mm的轴承钢球进行了三种典型代表缺陷的实验，结果表明，该检测系统能够以高重复检测精度检测宽度为0.05mm、深度为0.1mm的表面缺陷，检测效率为5个/秒，满足ISO 10级轴承钢球的检测要求。验证了利用SECS检测钢球表面缺陷的可行性。
