Pulse laser precision truing of the V-shaped coarse-grained electroplating CBN grinding wheel

Abstract

The machining difficulty has limited the further application of ultra-hard materials. For V-shaped coarse-grained electroplated cubic boron nitride (CBN) grinding wheel, a precise and efficient pulse laser truing method was proposed. Firstly, a theoretical model of the pulse laser truing process was established in order to optimize the laser truing energy distribution. Secondly, the effects of truing depth, grinding wheel speed, laser power and truing time were analyzed. Finally, the grinding performance of laser trued wheels were evaluated. The results showed that larger grinding wheel speed n would bring higher energy value and more stable energy distribution, truing depth h would not affect the value and stability of energy. CBN would not undergo phase transition and could bear more laser power Pavg. With the increase of truing time t, the geometric precision of V-shaped grinding wheel could be improved. The angle of V-shaped grinding wheel could reach 90.15° (deviation 0.02°), the bottom fillet radius was 53 μm (less than 100 μm). The surface roughness and grinding force corresponding to laser truing were less than that of mechanical truing, the truing time required was reduced by 72%∼83%, and the corresponding tooth profile angle and bottom fillet were basically the same.

Keywords

• Laser precision truing
• Coarse-grain wheels
• V-shaped
• CBN
• Energy distribution model
• Grinding performance