Precision diamond grinding wheels are often used to machine the workpiece to achieve high surface quality in precision grinding. However, as the particle size of the abrasive grains decreases, the chip space of the grinding wheel becomes small, so that the chip hole clogging is likely to occur during the grinding process, and the diamond abrasive becomes dull. Therefore, the abrasives’ self-sharpening deteriorates and they are subjected to more grinding force. In addition, the frictional heat generated by the abrasive and the workpiece accumulates, which seriously affects the surface processing quality of the workpiece, and even severely burns the surface of the workpiece to cause subsurface damage. In order to ensure the grinding quality and grinding efficiency, it is necessary to trim the precision diamond grinding wheel. A reasonable dressing method can make the grinding wheel have good surface topography, and the surface morphology of the grinding wheel (the number of abrasive blades, the number of pores, the wear condition of the bonding agent) directly affects the surface quality of the workpiece. Glory Diamond Tools could offer diamond grinding wheel, like 11A2 grinding wheel, 12A2 grinding wheel, etc.
Online electrolytic dressing processing is mainly applied to the dressing of metal-based bond precision diamond grinding wheel. The working principle of online electrolytic dressing is as follows. The grinding wheel is used as the positive electrode. The negative electrode is installed on the end face of the grinding wheel, and a certain gap is maintained with the end face of the grinding wheel. The soluble chemical grinding fluid is supplied in the gap between the grinding wheel and the workpiece. When the two electrodes are energized, electrolysis is generated to corrode the excess metal to achieve the purpose of the diamond abrasive grain. The current magnitude affects the edge rate of the grinding wheel. The different current load ratio increases with time, the thickness of the oxide layer increases, and finally reaches a stable value. The thickness of the oxide layer is almost independent of the magnitude of the current load ratio. In short time, the thickness of the oxide layer is kept constant, and no longer increases with the increase of the current load ratio. The number and size of the pore distribution are greatly reduced when the current load ratio is increased. As the adhesion between the bond and the abrasive decreases, the depth of the abrasive grains decreases, which is beneficial to improve the surface quality of the workpiece. The trimming current, voltage, and current load ratios affect the material removal rate of the wheel surface. Suitable electrolysis time is beneficial to extend the life of the grinding wheel.
Electric spark trimming achieves the purpose of dressing the grinding wheel by using thermal energy or electric spark between the electrode and the rotating metal bond diamond grinding wheel to remove excess metal material on the surface of the grinding wheel. Good diamond abrasive grain edge height can be obtained by trimming the metal bond diamond wheel with EDM technology. EDM dressing of boron-doped diamond grinding wheels can improve the grinding performance of the grinding wheel.
The soft elastic dressing method has the characteristics of high dressing efficiency, high precision and good edge of diamond abrasive grains, and can be applied to the dressing of various bond diamond grinding wheels. With soft elastic dressing method, a belt is often used as a grinding tool to trim the diamond wheel. During dressing process, the diamond wheel rotates at a high speed, and the grinding wheel moves slowly so that the belt in contact with the diamond wheel has a relative motion with the diamond wheel.