Induction heating method and apparatus for elongated workpieces
US4420667A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 21, 1982 |
| Grant date | Dec 13, 1983 |
| Priority date | — |
| Expiry date | Jun 21, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/25
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Elongated workpieces having an extended intermediate portion of substantially uniform cross-section and axially spaced end or other portions of enlarged cross-section are inductively heated to a desired surface temperature by axially moving them at a continuous rate of speed coaxially of and sequentially through a succession of three axially aligned multiturn induction heating coils and energizing selective ones of the heating coils, during the passage therethrough of selected ones of the workpiece portions to inductively heat the same to the desired surface temperature. The coils have separate power supply circuits for energizing the coils, and suitable control means are provided for activating the power supply circuits to energize the coils in succession and during the travel of the selected portions of the workpiece through selected ones of the heating coils.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.