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Views: 0 Author: Site Editor Publish Time: 2025-08-18 Origin: Site
Main Motion: The rotational motion of the hob, which provides cutting power for the cutting edges to remove metal from the surface of the gear blank.
Generating Motion: The forced meshing rotational motion between the hob and the gear blank, ensuring that their transmission ratio strictly equals the theoretical transmission ratio of a gear pair. Let the number of hob heads be k (usually 1–2) and the number of teeth of the gear blank be z. The transmission relationship is designed such that the hob rotates z turns while the gear blank rotates k turns—this motion envelops the involute tooth profile.
Feed Motion:
Axial Feed: The linear movement of the hob along the axis of the gear blank (feed rate f, unit: mm/r), ensuring the entire tooth width is cut.
Radial Feed: The movement of the hob along the radial direction of the gear blank, controlling the cutting depth (tooth height). This process usually involves two feeds: rough cutting and finish cutting.
| Module (m) | Relief Groove Width (e, mm) | Module (m) | Relief Groove Width (e, mm) | ||||
|---|---|---|---|---|---|---|---|
| (beta=15^circsim25^circ) | (beta>25^circsim35^circ) | (beta>35^circsim45^circ) | (beta=15^circsim25^circ) | (beta>25^circsim35^circ) | (beta>35^circsim45^circ) | ||
| 2 | 28 | 30 | 34 | 9 | 95 | 105 | 110 |
| 2.5 | 34 | 36 | 40 | 10 | 100 | 110 | 115 |
| 3 | 38 | 40 | 45 | 12 | 115 | 125 | 135 |
| 3.5 | 45 | 50 | 55 | 14 | 135 | 145 | 155 |
| 4 | 50 | 55 | 60 | 16 | 150 | 165 | 175 |
| 4.5 | 55 | 60 | 65 | 18 | 170 | 185 | 195 |
| 5 | 60 | 65 | 70 | 20 | 190 | 205 | 220 |
| 6 |
