Working principle of gear hobbing machine

Writer： admin Time：2024-11-19 10:37:48 Browse：9℃

The working principle of a gear hobbing machine is achieved by simulating the motion of a pile of meshing cylindrical gears. 

During the gear hobbing process, one is the workpiece and the other is a gear hobbing tool equipped with cutting edges. 

The gear hobbing tool performs high-speed reciprocating linear motion along the axial direction of the workpiece, while maintaining seamless meshing motion with the workpiece,

 thereby machining a complete tooth profile on the workpiece. The tool only cuts out a small part of the workpiece's tooth groove every time it reciprocates, 

and finally forms a complete tooth groove curve through multiple cuts.

During the machining process, the gear hobbing machine needs to have the following movements

Main motion: The gear hobbing tool undergoes up and down reciprocating motion, with downward movement being the cutting motion and upward movement being the return cutting motion.

 The cutting speed and the stroke length of reciprocating motion determine the number of reciprocating strokes per minute of the hobbing tool.

Development of motion: The hobbing tool and the workpiece maintain a meshing relationship with a pair of gears, that is, when the tool rotates one tooth, the workpiece should also accurately rotate one tooth.

Radial feed motion: In order to gradually cut the tool to the full tooth depth of the workpiece, the hobbing tool must perform radial feed. 

When the full tooth depth is reached, the machine tool will automatically stop the radial feed motion.

Circular feed motion: The speed of rotation of the hob directly affects the cutting amount of the hob and the speed of rotation of the workpiece, as it rotates one angle every time it reciprocates.

Move the tool: In order to avoid the gear hobbing tool rubbing against the machined surface during the return journey and reduce tool wear, 

a certain distance should be maintained between the tool and the workpiece, and it should be immediately restored to its original position when resuming the working stroke.

Through the coordinated coordination of these movements, the gear hobbing machine can efficiently machine precise gear tooth profiles on the workpiece