| 摘要 |
PURPOSE:To enhance cylindricity of the surface to be ground by sensing the grinding forces in the normal and tangential directions, determining the grinding force as the vector resultant of the two first named grinding forces, and by controlling so that this resultant grinding force becomes constant. CONSTITUTION:When a grinder 1 performs grinding, the grinding force in the normal direction FN and that in the tangential direction FT are sensed by magnetic sensors 14a, 14b, respectively. Then the grinding force F as the vector resultant of these two, FN and FT, is calculated, and control is performed so that this value F becomes constant. Thereby the angle of deflection of the grinding wheel spindle 3a is kept constant even though the deflecting direction of this shaft varies a little, which decreases as a result the degree of taper very much to lead to enhancement of the cylindricity of the surface ground. Because the grinding force F as the resultant is controlled constant, the grinding force FN in the normal direction decreases with increasing grinding force FT in the tangential direction, and accordingly the roughness of the ground surface is held in satisfactory condition.
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