| 摘要 |
The present invention provides an initial position setting method of grinding wheels, before starting a grinding operation, in a vertical double disc surface grinding machine for surface grinding the upper and lower grinding surfaces of a work-piece simultaneously by rotation-driving a pair of grinding wheels by a grinding wheel rotation drive motor and moving the grinding wheels up and down by a grinding wheel vertical drive motor. This method comprises a moving stroke (# 1, #4 ) for-rotating the grinding wheels ( 2, 3 ) by the grinding wheel rotation drive motors ( 46 ), and vertically moving the grinding wheels ( 2, 3 ) by the motors for elevating/lowering the grinding wheels ( 41 ) toward ground surfaces of the work-piece (W) from a setting-start position (Q 1 ) which is vertically separated away from the ground surfaces of the work-piece (W), a detection stroke (# 2, #5 ) for detecting contacts between the grinding wheels ( 2, 3 ) and the ground surfaces of the work-piece (W), and stopping the vertical movement of the grinding wheels ( 2, 3 ) based on the detection, and an initial position setting stroke (# 3, #6 ) for vertically moving the grinding wheels ( 2, 3 ) by the motors ( 41 )for elevating/lowering the grinding wheels, by a predetermined amount in a direction separating away from the ground surfaces of the work-piece (W).
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