Gear Hobbing
Gear hobbing is a continuous generating process in which a helical hob and the workpiece roll against each other at a defined speed ratio. It is the most economical process for producing external gearing in series production.
Operating Principle
The hob has a helical profile that matches the reference profile of the gear to be produced. During engagement the hob rotates while the workpiece rotates synchronously. The axial or diagonal feed motion of the hob generates the tooth profile by the generating process: each cutting edge of the hob creates the involute tooth flank through a multitude of tangential cuts. A single hob can process all tooth counts of a given module — regardless of the workpiece tooth count.
Process Limits and Alternatives
Gear hobbing is limited to external gearing; internal gears, stepped gears with shoulders, or gears at shaft ends with restricted space require gear shaping. After hobbing, case hardening, nitriding, and subsequent gear grinding can raise the quality to Q 5–7. The quality achievable by hobbing alone typically ranges from Q 7–9.
Thank you for your feedback.
Anonymous · without cookies