KOMATSU GPM 200F2-3 CNC crankshaft machining center

KOMATSU GPM 200F2-3 CNC crankshaft machining center was manufactured in 2002 by the Japanese company Komatsu Machinery Corp. The machine processes crankshafts with a maximum length of 700 mm. The cross slide moves longitudinally on the bed guides by means of an AC (alternating current) actuator. The working head was manufactured and rigidly bolted to the bed. A handle, specially designed by Komatsu for this machine, is mounted on the head. They are centering triple jaws in a cast steel housing, with a clamping force of 80 kN. The steady rest enables stable machining, even when the workpiece is heavily cut. The crankshaft milling machine has six controlled axes (X1, X2, Y1, Y2, Z1, Z2) with maximum feeds of +/- 172.5 mm (for X1 and X2 axes), +/- 95 mm (for Y1 and Y2 axes) and +/- 450 mm (for Z1 and Z2 axes). Rapid feeds in the X, Y, Z axes are respectively 12040 mm/min, 6700 mm/min and 14400 mm/min. All axes have a SIEMENS 1FT6 actuator with an brake Absolute. The machine is equipped with two spindles rotating at a speed of 188 rpm and a CNC control SIEMENS Sinumerik 840D. The total weight of the GPM 200F2-3 machining center is 26,000 kg.

Specifications of CNC crankshaft milling machine KOMATSU GPM 200F2-3

– CNC control: SIEMENS Sinumerik 840D
– number of controlled axes: 6
– maximum detail length: 700 mm
– minimum eccentric diameter: 210 mm
– minimum diameter of the main journal: ƒ50 mm
– height of the chuck center: 1280 mm
– maximum feed in axes:
X1: +/- 172.5 mm (tool center 95 mm)
X2: +/- 172.5 mm (tool center 95 mm)
Y1: +/- 95 mm
Y2: +/- 95 mm
Z1: +/- 450 mm
Z2: +/- 450 mm
– maximum rapid feed in the axes:
X: 12040 mm/min
Y: 6700 mm/min
Z: 14400 mm/min
– X, Y, Z axis actuator: SIEMENS 1FT6 with an brake Absolute
– number of spindles: 2
– spindle motor power: 37 kw
– spindle speed: 188 rpm
– cutting speed 142 m/min
– tool diameter: 240 mm
– workpiece steady
– workpiece head (2 pcs.)
– hydraulic unit tank capacity: 100 l
– voltage: alternating current, 3-phase, 380V +/- 10%, 50Hz +/- 1Hz
– machine height: 2950 mm
– weight of the GPM 200F2-3 crankshaft milling centre: 26 t

Clamping movements in the chuck of the crankshaft milling centre

1. The crankshaft is loaded on the support locks in the holders,
2. The fangs approach the centerline of the handle on both sides,
3. The crankshaft is pushed against the side support washer,
4. There is a check if the part is well pressed (checking the seating of the part),
5. The triple jaws finally come closer to clamp the part with its main trunnion and collar.