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Method-and-apparatus-for-removing-material-from-a-surface

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Method and apparatus for removing material from a surface

Details

Inventors: Daunt, John E.; Tipton, John P.; Adair, John E.;
Assignee: General Electric Company (Cincinnati, OH)
Primary Examiner: Albritton; C. L.
Assistant Examiner:
Attorney, Agent or Firm: Sachs; Lee H., Lawrence; Derek P.

The relative position of a plurality of holes through a surface of a member, the holes having been generated by high energy means, such as a laser, which vaporizes material of the member to produce a light flash, is inspected and controlled as the holes are being generated using a light sensing means which is responsive to the light flash and which observes the relative positions of the holes being produced. The light sensing means signals a hole pattern comparison means which compares the actual hole pattern with a preselected hole pattern. Adjustment can then be made to reposition the high energy beam if required to correct undesirable error in the actual hole pattern during generation of the holes.

DETAILED DESCRIPTION What is claimed is: 1.
In a method for making a plurality of holes through a surface of a member in which the holes are generated by an energy beam sufficient to vaporize material of the workpiece and create a light flash, the method of inspecting and controlling the position of such plurality of holes comprising: determining the relative position of the generated holes by a light sensing means responsive to the light flash resulting from material of the member vaporizing as the energy beam produces each hole, each light flash illuminating an actual hole pattern in the vicinity of the hole from which the flash is generated; comparing the actual hole pattern with a preselected hole pattern; and then adjusting the position of the energy beam if required to correct undesirable error in the actual hole pattern.
2.
A method as in claim 1 for making, inspecting and controlling the position of a plurality of holes through a surface of a sheet member comprising the steps of: directing at the sheet member surface a plurality of laser beams which are pulsing at a predetermined rate and duration and which are of intensity sufficient to vaporize material of the sheet member and create light flashes, the beams being spaced apart one from the other, while providing relative movement between the sheet member and the laser beams along a preselected path; the pulsing of the laser beams and the relative movement between the laser beams and the sheet member being coordinated to generate a uniform, preselected hole pattern on the sheet member surface; determining the relative positions of the generated holes by a light sensing means responsive to the light flashes resulting from material of the sheet member vaporizing as the laser beams produce holes, each light flash illuminating the actual hole pattern in the vicinity of the hole from which the flash is generated; comparing the actual hole pattern with a preselected hole pattern; and then adjusting the position of at least one of the laser beams if required to correct undesirable error in the actual hole pattern

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