B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
82/9
B23B 5/18 (2006.01) B23D 37/00 (2006.01)
Patent
CA 1319544
Abstract of the Disclosure An apparatus for machining a workpiece such as a crankshaft provides a superior combination of low initial and rebuilding costs, high flexibility in tool changeover and alteration of configuration, yet minimizes floor space and noise level while allowing the combining of several machine operations in a single step. The apparatus also permits the use of optimum cutting speeds, cutting tool feeds, cutting tool composition and cutting tool dimensional tolerances. The apparatus includes a lathe bed to which the crankshaft is mounted and rotated at a variable rate of speed, as well as an arbor disposed parallel to the axis of rotation of the workpiece, rotatable in the same direction at a variable speed. At least one cutter disk is fixedly mounted to the arbor. The disk has a plurality of cutting tool disposed about part but not all of its circumference, the tools being located at a generally increasing distance from the center of the disk in a stepwise fashion. The circumference of the disk also includes a second cut out portion between the radially outermost and radially innermost tools. The disk is rotated to bring first the outermost and then the sequentially more inner tools into contact with the spinning workpiece, in order to machine it. The workpiece and disk are each rotated at programmed, varying rates in order to optimally match the tool feed rate and the workpiece surface linear speed for each machining operation, for example, rough cutting, finish cutting, dimensioning and the like. Once the radially innermost tool has cut the workpiece, the cut out portion of the disk circumference permits ready removal of the workpiece from the lathe bed without requiring reciprocation, reversal or movement of the disk out of the way. The invention thus advantageously avoids the tool slides or reciprocating carriers, and the associated wear, poor tolerances, extra mechanisms and the like encountered with prior art broaching tools.
578320
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