Machining center for processing center groove and center groove processing method of a crankshaft using the same

A machining center for machining a center groove on each of a pulley and a flange formed at opposite ends of a crankshaft of a vehicle, the machining center comprising:

• a measurement unit configured to measure a moment of the crankshaft when the crankshaft is loaded in the measurement unit;
• a controller configured to calculate an imbalance amount of the crankshaft depending on the moment and to derive center drill coordinates for removing the imbalance amount of the crankshaft;
• a clamping system configured to clamp the crankshaft;
• a compensation unit mounted in a base frame and configured to compensate a position of the crankshaft by rotating first and second rotating elements based on the center drill coordinates derived by the controller;
• and
• a machining unit configured to machine the center groove in each of the pulley and the flange of the crankshaft, a position of the center grooves being compensated through the compensation unit;
• wherein the first rotating element is a U-shaped element comprising symmetrical opposite sides that form opposite supporters, the first rotating element configured to rotate about a horizontal axis extending between the opposite supporters;
• wherein the second rotating element is disposed at a central portion of the first rotating element and is configured to rotate 360° about an axis that is perpendicular to the horizontal axis;
• and
• wherein the clamping system is mounted on an upper surface of the second rotating element.