Patent ID: 8056452
Filing Date: 2011-11-15
Classification: B23B,B23C,Y10T

Abstract:
1. A method of machining crankshafts using a machining tool arrangement, said machining tool arrangement comprising: a lathe device being configured and disposed to support and rotate a crankshaft workpiece; a control and movement arrangement being connected to and supported by said lathe device; a first tool and a second tool being connected to and supported by said control and movement arrangement; said control and movement arrangement being configured to control the movement of said first tool and said second tool in a machining operation; each of said first tool and said second tool comprising a cutting insert; said cutting insert comprising: said method comprising the steps of: placing a crankshaft workpiece into said lathe device; activating said lathe device to rotate the crankshaft workpiece; activating said control and movement arrangement and moving said first tool toward the crankshaft workpiece in a radial direction with respect to the central rotational axis of a bearing section of the crankshaft workpiece; continuing moving said first tool and its cutting insert in the radial direction and machining, with said corner cutting tooth of said first plurality of teeth, a first base surface disposed about and extending radially away from a first end of the bearing section; continuing moving said first tool in the radial direction and machining with said first plurality of teeth a portion of a longitudinal surface of the bearing section parallel to the central rotational axis of the bearing section until a desired depth of cut is achieved, and then at least substantially simultaneously beginning moving said first tool in an axial direction with respect to the central rotational axis of the bearing section away from the first base surface; continuing moving said first tool in the axial direction along the longitudinal surface of the bearing section and machining with said first plurality of cutting teeth a substantial portion of the longitudinal surface of the bearing section; moving said first tool out of engagement with said crankshaft workpiece; moving said second tool toward the crankshaft workpiece in the radial direction; continuing moving said second tool and its cutting insert in the radial direction and machining, with said corner cutting tooth of said first plurality of teeth, a second base surface disposed about and extending radially away from a second end of the bearing section; continuing moving said second tool in the radial direction and machining with said first plurality of teeth another portion of the longitudinal surface of the bearing section until a desired depth of cut is achieved, and then at least substantially simultaneously beginning moving said second tool in the axial direction away from the first base surface; continuing moving said second tool in the axial direction along the longitudinal surface of the bearing section and machining with said first plurality of cutting teeth the remaining unfinished portion of the longitudinal surface of the bearing section; and moving said second tool out of engagement with said crankshaft workpiece.