Development of the real time on-machine measuring system of grinding surface integrity

点击翻译按钮获取中文摘要

The new sensor which can measure the surface integrity on the machine in the real time, has developed. The sensor can measure the residual stress distribution, hardness distribution and material structure distribution below the machining surface, such as grinding, cutting, lapping, polishing and so on.The prototype sensor consists of exiting coil and detecting coil. It is set with the gap between the sensor and workpiece and it is created the magnetic circuit between the exiting coil, detecting coil and workpiece. It can measure the residual stress, as the magnetic permeability of the workpiece material is in proportion to the stress of the machining surface.It has made clear that the sensing characteristics, the effect of factors on the precision of measuring, and the comparison of the measuring value by the X-ray diffraction meter.The sensor has a linearity of the out put voltage in 2 mm gap and the measuring resolution is 20 mum, and it can measure the residual stress distribution within 200 mum below the machining surface. And it has an enough ability such as the judgment machine of the surface integrity for the grinding system which control it in the real time.When the surface integrity measured by this sensor is over the permission level, the CNC (Computer Numerical Control) device give the command to stop the CNC program, and dress the grinding wheel by interrupt, or change the grinding condition in order to get the good surface integrity within the permission level.