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Title: Positional reference system for ultraprecision machining

A stable positional reference system for use in improving the cutting tool-to-part contour position in numerical controlled-multiaxis metal turning machines is provided. The reference system employs a plurality of interferometers referenced to orthogonally disposed metering bars which are substantially isolated from machine strain induced position errors for monitoring the part and tool positions relative to the metering bars. A microprocessor-based control system is employed in conjunction with the plurality of position interferometers and part contour description data inputs to calculate error components for each axis of movement and output them to corresponding axis drives with appropriate scaling and error compensation. Real-time position control, operating in combination with the reference system, makes possible the positioning of the cutting points of a tool along a part locus with a substantially greater degree of accuracy than has been attained previously in the art by referencing and then monitoring only the tool motion relative to a reference position located on the machine base.
Authors:
 [1] ;  [2] ;  [1]
  1. (Knoxville, TN)
  2. (Clinton, TN)
Publication Date:
OSTI Identifier:
864448
Report Number(s):
US 4365301
DOE Contract Number:
W-7405-ENG-26
Resource Type:
Patent
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
Country of Publication:
United States
Language:
English
Subject:
positional; reference; ultraprecision; machining; stable; positional; reference; improving; cutting; tool-to-part; contour; position; numerical; controlled-multiaxis; metal; machines; provided; reference; employs; plurality; interferometers; referenced; orthogonally; disposed; metering; bars; substantially; isolated; machine; strain; induced; position; errors; monitoring; tool; positions; relative; metering; bars; microprocessor-based; control; employed; conjunction; plurality; position; interferometers; contour; data; inputs; calculate; error; components; axis; movement; output; corresponding; axis; drives; appropriate; scaling; error; compensation; real-time; position; control; operating; combination; reference; makes; positioning; cutting; tool; locus; substantially; degree; accuracy; attained; previously; referencing; monitoring; tool; motion; relative; reference; position; located; machine; base; precision machining; cutting tool; reference position; position control; positional reference; positional reference; stable position; numerical control; error components; data input; numerical controlled /700/82/318/356/451/