In-Process Optical Gauging for Numerical Machine Tool Control and Automated Processes.

摘要

In the past 15years,the parts programming/coding,data manipulation,and servo technologies of numerical machine tool control have advanced to a point where the limiting factor is now the technique used for the real-time measurement of the controlled process in the feedback loop. All transduction methods used today close the loop on the machine slides or the positioning screws leaving machine deflections,tool wear,backlash,screw/nut errors,thermal expansions,etc.,outside the control/measurement loop. The research deals with the study of this loop closure by monitoring,by laser optical techniques,the dimension of the actual workpiece as close as possible to the point of contact of the cutting tool so that all machine errors are within the control loop. The report proposes a solution to the measurement/control problem that involves the use of a small He-Ne laser source chopped into two phase-orthogonol signals and focused at fixed incident angles at a common point on the workpiece surface.