Abstract
To achieve dynamic error compensation in CNC machine tools, a non-contactlaser probe capable of dimensional measurement of a workpiece while it is being machinedhas been developed and presented in this paper. The measurements are automatically fedback to the machine controller for intelligent error compensations. Based on a well resolvedlaser Doppler technique and real time data acquisition, the probe delivers a very promisingdimensional accuracy at few microns over a range of 100 mm. The developed opticalmeasuring apparatus employs a differential laser Doppler arrangement allowing acquisitionof information from the workpiece surface. In addition, the measurements are traceable tostandards of frequency allowing higher precision.
Highlights
Zero defect parts could only be obtained via full automatic error compensation while they are being machined on the generation of intelligent machining processes to ensure high quality products at low price and short time
Off-line axis error compensation is successfully achieved with NC machines including thermal growths while on-line compensation still has some difficulties mainly with probes hardware and controllers [1,2]
The performance of the differential laser Doppler technique applied to solid material has been demonstrated through various tests and diameter measurements
Summary
Zero defect parts could only be obtained via full automatic error compensation while they are being machined on the generation of intelligent machining processes to ensure high quality products at low price and short time. Quality control of the manufactured parts is traditionally performed using manual inspection methods and statistical sampling procedures. It has the disadvantages of releasing some defective parts and using an inspection area. In-process measurement techniques have been proposed over the last two decades to control the quality of a workpiece with some difficulties to be addressed. An in-process laser Doppler technique is presented to measure a diameter of the moving workpiece. The fundamental method of differential Doppler technique is employed for solid material with an emitting laser kept clean from back lights using polarizer and retarder as well as an optical amplification of the scattered light. It is expected to enhance the accuracy of measurement up to very few micrometers over a range of 100 mm with a very good traceability of measurements as it uses Laser light as core component
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