关键词: 串珠, 花岗石, 金刚石, 磨损, 30Cr2Ni4MoV钢, 拔长, 轴, 组织均匀性

Abstract: Wear characteristics of sintered diamond beads and diamond grits in wire sawing granite is experimentally studied, and the wear model of diamond beads is established. The experimental results show that wear of bead along axes take on non-uniform in the cutting process. The wear value in the front of bead is much greater than that of the others. Meanwhile, wear value in the end of bead is also greater than that in the middle of bead. Consequently, bead presents the shape of drum. The average diamond protrusion in the front of bead is higher than that in the other places. However, non-normal pull-out easily happens for the diamond grits with high protrusion due to the abrasion action of swarfs. The wear of beads can be divided into two phases: drum-shape forming and drum-shape holding. The cutting loads and swarfs lead to the difference of wear in the front, middle and end of beads in two phases. The wear in the front bead is mainly effected by the abrasion action of swarfs. Cutting load is the main influencing factor for the wear in the middle of bead. Whereas, these two influencing factors have weak effects on the end of bead.

Key words: Bead, Diamond, Granite, Wear, axle, organization uniformity, swaging, 30Cr2Ni4MoV steel