or ductile iron, has two important parts: the main shaft neck, connecting rod neck, (and others). The main shaft neck is mounted on the cylinder block, the connecting rod neck is connected with the big head hole of the connecting rod, and the small head hole of the connecting rod is connected with the cylinder piston. It is a typical crank slider mechanism. Crankshaft lubrication mainly refers to the lubrication of the connecting rod big head bearing bush and crankshaft connecting rod neck and the lubrication of the two fixed points. The rotation of the crankshaft is the power source of the engine. It is also the source of power for the whole mechanical system. Crankshaft rough machining will be widely used CNC lathe, CNC internal milling machine, CNC lathe broaching machine and other advanced equipment on the spindle neck, connecting rod journal CNC turning, internal milling, turn-broaching processing, in order to effectively reduce the deformation of crankshaft processing. CNC controlled crankshaft grinder is widely used to finish the crankshaft journal. The grinding machine will be equipped with automatic dynamic balancing device of grinding wheel, automatic tracking device of center frame, automatic measurement, automatic compensation device, automatic dressing of grinding wheel, constant linear speed and other functional requirements to ensure the stability of grinding quality.