Tatsuaki Furumoto

A017 Thermal Dressing of Metal Bonded Diamond Wheel by Nd:YAG Laser : Optimization of air-jet irradiation angle

In this study, a pulsed Nd:YAG laser beam is used as a non-contact thermal dressing tool for a metal bonded diamond wheel. In order to efficiently remove the bond material, it is necessary to direct air on the spot irradiated by the laser so as to blow away the molten binder. The new integrated laser-air head makes it possible to make an appropriate chip pocket depth with less residual re-solidification layer of bond material. The grinding experiments of the hot-pressed SiC reveals that the laser-dressed wheel has somewhat better grinding performance than the conventional rotary dressed wheel.

Cut-off characteristic of CBN and diamond stick stones with pulsed YAG laser: laser cutting of superabrasive stone

In this Paper, laser cutting of super abrasive thin stick stone (SATSS) whose grains are CBN and diamond using Nd:YAG laser is studied. We have investigated cutting characteristics of SATSS and strength of the heat affected zone (HAZ) on the surface cut with laser. As a result, SATSS of 3 mm in thickness can be cut off with the width of 0.2 mm in maximum, and there is no chipping at the edge of the surface cut with laser. In the case of CBN stick stone, cutting time with laser is 2.5 times faster than that with diamond blade, and 15 times faster in the case of diamond one. There is a HAZ with a thickness of 0.05 mm. In this HAZ, the abrasive grains are oxidized and their crystal structures are changed by the heat of laser irradiation. However, laser is absorbed effectively by the HAZ, and the HAZ raises the strength of SATSS because the pores inside of the HAZ are closed by the re-solidified vitrified bond. From these results, it is shown that laser cutting can apply to the manufacturing of the SATSS and improve the productivity and the quality.