Crankshaft blanks are usually roughed and then tempered for good mechanical properties, followed by semi-finished and precision axles.

In addition, it is necessary to process each hole system, such as: internal cavity oil passage - oblique oil hole, main oil hole, weight reduction hole, straight oil hole, etc., and the working environment of the crankshaft in the diesel engine is relatively bad, the journal The surface needs to be strengthened. Generally, there are two methods of surface intermediate frequency quenching and nitriding. In addition, some details must be dealt with, such as round roll rolling strengthening and shot peening. In addition, dynamic balance and oil pump oil test must be done.

The typical processing flow of locomotive diesel crankshaft machining is as follows:
Roughing and roughing of the spindle neck and connecting rod neck quenching and tempering process hole quenching and tempering (performance test) Dash semi-finishing spindle neck and connecting rod neck flange hole roughing processing stress finishing finishing spindle neck and connecting rod neck finishing Hole type (oil hole, balance block mounting face, weight reduction hole, inclined oil hole, flange hole, etc.)

Rough grinding of the main journal and connecting rod neck Nitriding Fine grinding of the main journal and connecting rod neck Polishing main journal and connecting rod neck Filling and rolling strengthening treatment, etc. Assembly Pump oil Dynamic balance Oil-proof rust-proof delivery.