Method and apparatus for heat treating an internal bore in a workpiece
US4017708A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1976 |
| Grant date | Apr 12, 1977 |
| Priority date | — |
| Expiry date | Feb 27, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S148/909
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of heat treating a bore in a workpiece to increase its surface hardness is disclosed, including shaping an annular laser beam emanating from a source into an elongated focal pattern to provide a more evenly distributed energy level in cross section, directing the elongated focal pattern generally axially inwardly toward the bore, reflecting the elongated focal pattern from a mirror arrangement substantially transversely upon a surface of the bore to provide an instantaneously more uniformly hot heating zone thereat, and effecting relative motion between the workpiece and the mirror arrangement so that the bore is progressively scannably heat treated to minimize heating of the entire workpiece.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.