Method and apparatus for shaping the surfaces of cams on a camshaft
US4714809A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1986 |
| Grant date | Dec 22, 1987 |
| Priority date | — |
| Expiry date | Aug 15, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/25
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method and apparatus for shaping, in a planar direction, an elongatd generally flat surface formed in a steel workpiece and having a geometric continuous configuration, such as the outer facing surface of a cam on a camshaft for an internal combustion engine, which involve providing an inductor having a generally continuous heating surface matching the cam surface and generally parallel with the cam surface, forming at least one elongated uniformly cross-section groove in the inductor heating section and extending in a preselected linear location with respect to the heating surface and coterminous with the inductor heating surface, positioning the camshaft with the cam surface facing the parallel matching heating surface of the inductor with an air gap between the parallel matching surfaces so that the groove in the inductor surface faces a preselected band of the cam surface, such as the middle portion of the cam surface, energizing the inductor with a current having a frequency of less than about 25 KHz for a time less than about 3.0 seconds with a power density of about 20-70 KW/in.sup.2, at the cam surface, whereby the steel surface is heated to a temperature above the harden…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.