Study on the Ultrasonic Rock Cutting (2nd Report)
1964 Volume 80 Issue 912 Pages 491-494
Details
1964 Volume 80 Issue 912 Pages 491-494
In the previous paper, we pointed out that a remarkable reduction of cutting resistance of rock can be expected by the application of the ultrasonic vibration cutting method.
In this report, the results of the further investigations on this problem are described. As the first step, several kinds of rocks and “matsuiwa”, silicified woods, were cut by the vibrating bit, and then the rate of the reduction of cutting resistance was compared with their mechanical properties. Then the effect of the amplitude of vibrating bit and the water pouring on the cutting resistance and the wear of bit were studied. The results obtained from these studies are as follows.
1) The rate of the reduction of cutting resistance in the case of vibration cutting is dependent on the hardness of rock.
2) The rate of the reduction of cutting resistance increases with the increase of the amplitude of vibrating bit, but when the amplitude increases over a limit which seems to be an inherent value of the rock to the kinds of rocks, the rate of the reduction is approximately constant with the amplitude.
3) The cutting resistance in the case of wet vibration cutting process is remarkably low in comparison with the dry cutting.
4) The wear of bit increases as the amplitude of vibrating bit increases.
