RICHARD A HELLA
Engineering in North Andover, MA
License number
Massachusetts 29676
Issued Date
Jul 27, 1979
Expiration Date
Jun 30, 2018
Type
Mechanical Engineer
Address
Address
North Andover, MA 01845
Professional information
Method Of And Apparatus For Heat Treating Axisymmetric Surfaces With An Annular Laser Beam
US Patent:
4456811, Jun 26, 1984
Filed:
Jun 21, 1982
Appl. No.:
6/390176
Inventors:
Richard A. Hella - North Andover MA
John V. Staal - Needham MA
John V. Staal - Needham MA
Assignee:
Avco Everett Research Laboratory, Inc. - Everett MA
International Classification:
B23K 2700
US Classification:
219121LM
Abstract:
This invention is directed to a method of and apparatus for heat treating axisymmetric surfaces such as inner and outer surfaces on pipes, shafts, gears, valve seats and the like with a laser beam. An annular laser beam is provided and caused to impinge on a segmented generally conical mirror which focuses and/or directs the laser beam onto the desired surface of a work piece as an annular or ring-shaped beam with a predetermined width and energy profile. Relative movement about the axis of the laser beam may be provided between the work piece and the laser beam to average any intensity distributions around the laser beam. Additionally, relative movement along the axis of the laser beam may also be provided between the work piece and the laser beam in the case of shafts, pipes and the like to provide uniform and non-overlapping coverage of the surface to be treated.