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Method-and-apparatus-for-correcting-diametrical-taper-on-a-workpiece

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Method and apparatus for correcting diametrical taper on a workpiece

Details

Inventors: Barton II, Kenneth A.; Bochsler, Rolf O.;
Assignee:
Primary Examiner: Kisliuk; Bruce M.
Assistant Examiner: Morgan; E.
Attorney, Agent or Firm: Brooks & Kushman

A microfinishing arm assembly for reducing taper on selected bearing journal surfaces of various workpieces rotated about a longitudinal axis. The microfinishing arm assembly includes a primary finishing arm and a taper correction means for applying a plurality of adjacent independently variable grinding pressures. A primary abrasive means for finishing a journal surface is mountable on the primary finishing arm and adapted for use in cooperation with the taper correction means. A measuring means for gauging the bearing journal surfaces at a plurality of spaced points during rotation is utilized with a processor means for receiving the gauging signals, calculating diameters of the journal surfaces and generating a plurality of output signals corresponding to the diameters of the bearing surfaces at spaced points. A comparator means compares the output signals to determine whether a taper exists on selected journal surfaces and controls the extent to which a taper correction means applies variable grinding pressure to the surfaces to correct the taper.

DETAILED DESCRIPTION In accordance with the present invention, a taper correcting microfinishing arm assembly is provided for reducing taper on selected journal surfaces of a workpiece.
The assembly includes a means for applying a variable abrading pressure to a selected journal surface at predetermined locations.
At least two diameter gauges are disposed along the surface during rotation of a workpiece and generate gauging signals representing the diameter of the surface at two axially spaced locations along the surface.
A means for comparing the gauging signals and generating a control signal for applying a variable abrading pressure to correct the taper is included.
It is an object of the present invention to provide a taper correcting microfinishing arm assembly for reducing taper on selected journal bearing surfaces of a workpiece.
Another object of the present invention is to provide a taper correcting microfinishing arm that reduces taper on selected journal bearing surfaces of a workpiece by utilizing in-process gauging at selected bearing surfaces to be finished along the axial length of a workpiece.
It is another object of the present invention to provide a means for reducing taper automatically without losing contact between the grinding means on the surface of a workpiece and the bearing journal surface.
It is a further object of the present invention to utilize at least two diameter gauge points per bearing surface to be finished in the in-process gauging apparatus for arriving at a more accurate determination of the diametrical taper existing on the workpiece.
It is a still further object of the present invention to provide a means for comparing the diameters found on the bearing surface of the workpiece and controlling a means for applying a variable pressure to the bearing surface to reduce the defined diametrical taper.
It is yet another object of the present invention to provide a means for applying a variable pressure to the bearing surface contained on the workpiece with at least two independently variable back-up shoes which are utilized to reduce taper defined on the workpiece

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