PURPOSE:To permit a device to correspond to a crankshaft of miltiple kinds, by supporting to a movable bed, controlled to be fed in accordance with a numerical control instruction, two sets of fillet roller devices for roll working a journal part and a pin part and enabling a distance between these devices to be changed by the numerical control instruction. CONSTITUTION:A movable bed 9 on a guide rail 8 along a direction of the axial line of a crankshaft W can be moved in accordance with a numerical control instruction. The movable bed 9 in its bottom surface supports to a pair of supporting plates 13 the first supporting arm 14a and the second supporting arm 14b further a swivel arm 14c which are swivellable around the axial line of the crankshaft W. Further the above described arms enable their mutual distance to be automatically regulated. And journal part and pin part roll working fillet rollers, provided in a plate pivotally supported to the above described arms, are forced respectively to be brought into contact, roll working a journal part and a pin part by rotating a main spindle 4 so as to rotate the crankshafts W. Accordingly, a fillet roll work device is enabled to correspond to a crankshaft of multiple kinds.
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