INTERNAL SURFACE MILLING MACHINE FOR USE IN CRANK PIN

摘要

The machine of the present invention is an internal milling machine designed to mill the crank pins and crank arm cheeks of heavy crankshafts to precise dimensions. By relatively simple substitutions of gage blocks, the machine is capable of milling crankshafts having a wide range of crankshaft throw and pin diameters. An internal milling cutter is mounted on the machine frame for operation within a general plane which is stationary with respect to the machine frame, the crank pins to be milled being axially and rotatively indexed in succession to a fixed position in operative relationship with the internal milling cutter. The crankshaft is supported at its opposite ends by chucks mounted in a headstock and a tail-stock which are rigidly coupled to each other by tie-rods for simultaneous axial indexing movement. Digital positioning control systems may be employed to drive the coupled headstock and tail-stock in axial indexing movement on the machine frame and to rotatively index the headstock chuck as required. Positively locked clamping systems are employed to rigidly fix the headstock at indexed positions on the machine ways and to rotatively lock the chuck at rotatively indexed positions. Both clamping systems are capable of shifting the headstock and headstock chuck to a final precisely located indexed position as the locking members are moved into their locking relationship.