| 摘要 |
PURPOSE:To prevent the vibration of a grinding wheel due to the generation of reggedness on its surface and improve the out of roundness of a work, by continuously changing a rotary speed of the grinding wheel alternately in a certain range at every fixed time and grinding the work in a different position on the peripheral surface of the grinding wheel. CONSTITUTION:A grinding wheel, when it is rotated alternately changing its speed N1=1,750rpm, N2=1,620rpm at a fixed time t=40S, forms its peripheral surface in the beginning of grinding to fine uniform ruggedness as shown by a waveform 7a in the drawing, further the wheel, as a measured result by grinding cemented carbides at a 2,500mm.<3>/mm. grinding amount, records a waveform 7b in the drawing, providing no regular ruggedness to be seen. And the out of roundness of a work, as a result measuring it to be compared, worsens as the grinding amount increases as shown by a line A in the drawing when the speed N is held in a fixed value while never worsens as shown by a line B in the drawing when the speed is changed. Then vibrative acceleration increases larger as the grinding amount increases as shown by a line A in the drawing when the speed N is held in a fixed value, while grinding is performed in small vibration as shown by a line B in the drawing if the speed is changed from N1 to N2. |
