IMPROVEMENTS IN OR RELATING TO MACHINING CRANK-PINS AND/OR CRANK-ARMS OF CRANKSHAFTS

摘要

1,215,724. Milling crankshafts. SKODA, OBOROVY PODNIK. 4 Jan., 1968 [24 Jan., 1967], No. 653/68. Heading B3T. In a method of milling the pins 3 and/or arms of a crankshaft the cutter 2 and crankshaft are rotated synchronously about circular paths 6, 4, the cutter axis lying perpendicular to a plane containing the crank-shaft axis, and the centre distance b of the paths 6, 4 is reduced to machine the pin to the required diameter. For roughing, the cutter axis may, as shown, lie above that of the pin, whereas for finishing it may coincide with the pin axis. The cutter diameter may be such that the side surfaces of the adjacent crank arms are milled simultaneously, or, Fig. 7, the cutter may be fed laterally to machine the surfaces in succession. Computer means may be utilized to synchronize the motions of the tool and crankshaft.