The general steps of crankshaft machining are as follows:
1. Blank (small crankshaft is forged, large crankshaft is ductile iron casting). When forging, the bar is burned red and then passed through multiple forging die, forged into a multi-turn plane, and the last process in the red hot state will be turned Screw to the appropriate angle.

2. Position the car, find the center of the main journal on the ordinary lathe, and position the two ends of the car;

3. The main shaft of the car,

4. The connecting rod journal of the car is on a special lathe. The tool holder follows the rotation of the connecting rod journal and enters the knife at the same time. At the same time, two connecting rod journals of the same angle are used at the same time. (Prototype or non-mass production is in the ordinary lathe. Make an eccentric clamp on the chuck and use the connecting rod journal as the center of rotation)

5. Drilling the oil passage hole, the crankshaft has a lubricating oil passage from the main journal to the arm to the inside of the connecting rod journal, and the deep hole drilling is performed by special equipment;

6. High-frequency quenching, quenching the main journal and the connecting rod journal to improve the surface hardness;

7. Grinding the spindle neck,

8. Grinding the connecting rod journal, it is a very precise special crank grinding machine, which will automatically measure the grinding while the precision is controlled by 0.01 mm;

9. Other processing, (flywheel connection keyway, oil return groove, thread, etc.)

10. Dynamic balance and de-weighting, also special equipment, can be drilled and de-weighted in the over-weighted arm blanks.