IN-PROCESS ROUNDNESS MEASUREMENTS OF STEEL RINGS DURING GAS QUENCHING: PRESENTATION AND ASSESSMENT OF THE OPTICAL DISPLACEMENT SENSORS

H. Gafsi, G. Goch

Abstract

This paper reports on the optical displacement sensors of a semi-optical system for measurements of roundness deviations of steel rings (~ 72.5 mm) during gas quenching. They are based on the extrinsic intensity modulation principle. The measurement system was developed within the scope of the Collaborative Research Centre SFB 570 of the German Research Foundation for investigation on the distortion of steel workpieces. Due to its capability for in-process measurements, this system also enables to compensate distortion effects. It is applied in a gas nozzle field specially designed for quenching steel rings symmetrically or asymmetrically with a broad variety of spatial temperature distributions. Before quenching, the ring has a starting temperature of 900 °C. <BR />The measurement system has been built and successfully tested. It is able to measure the change of the roundness deviation of a hot ring during quenching. Before the calibration of the whole system, the sensors should be characterised and assessed.

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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