| 摘要 |
PURPOSE:To make a hard, fragile work grindable in a highly efficient manner, by using a rolling bearing for linear slide motion in an air bearing slide table while a journal gaseous bearing for a feed guide in time of constant pressure infeeding separately, in case of mirror finishing for the hard, fragile work. CONSTITUTION:A jig 5 fitted with a work 1 is driven for rotation by a motor 17, while a grinding wheel 20 is rotated at high speed by a spindle 21, and the grinding wheel 20 is set in feed motion by a pulse motor 30 via a ball screw 26 and a nut 25 whereby sizing infeed takes place efficiently to the extent that precision finishing allowance by constant pressure infeed is left behind. Next, the pulse motor 30 is stopped, operating a linear motor 16 instead, and a constant thrust is given to a rotary shaft 6 fitted with the work 1 via thrust gaseous bearings 13a, 13b and thrust bearing parts 14a-14c as setting a journal bearing 12 down as a feed guide, whereby precision finish buffing by means of the constant pressure infeed is carried out and checked with length measuring machines 32a, 32b and a measuring instrument 19. Thus, and air bearing slide table is made to be unnecessary and, what is more, highly accurate, efficient finishing is performable. |
