Method for hardening gears by induction heating
US4675488A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1986 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Jun 25, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D9/32
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of hardening the radially, outwardly facing surfaces of a generally circular, toothed workpiece adapted to rotate about a central axis generally concentric with the outwardly facing surfaces whereby the extremities of the surfaces define an outer circle by the tips of the teeth of the workpiece. This type of workpiece is generally a gear. The method comprises the steps of providing first and second induction heating coil, locating the workpiece concentric in the first induction heating coil, energizing the first induction heating coil with a first alternating frequency current for a first time period, deenergizing the first coil with the workpiece therein for a first time delay period, again energizing this first induction heating coil with a second alternating frequency current for a second time period substantially less than the first time period, immediately transferring the workpiece concentrically into the second induction heating coil in a second delay time, then energizing the second induction heating coil with a radio frequency current for a third time period and immediately quenching the outer surfaces by quenching liquid sprayed against the surfaces while the wor…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.