Shaft gear is the main part in the gearbox, and its machining accuracy directly affects the overall quality of the gearbox. At present, the gear tooth processing method we use is the hobbing-shaving method. To make high-precision gears through the gear rolling and shaving process, the rolling and shaving process must be brought into full play. The gear shaving accuracy largely depends on the saddle hobbing accuracy, so some error items in the gear hobbing are strictly controlled to produce high-quality gears. Gear hobbing is a commonly used method of gear processing. On a high-precision gear hobbing machine, using a hob cutter, gear teeth with a precision of 4 to 5 can be processed. On ordinary gear hobbing machines, with ordinary precision hobs, only 8 precision gear teeth can be machined. The required accuracy of the gear teeth of the gearbox shaft is 8-7-7, and the two holes and the end face are used as the positioning reference during the hobbing process. Therefore, the error source of the gear hobbing is analyzed, and the method to ensure and improve the machining accuracy is very important. important.

The accuracy of shaft teeth is mainly related to motion accuracy, stability accuracy, and contact accuracy. To control the length of the common normal line and the diameter of the gear ring in the gear hobbing process