Measurement of Temperature and Die Face Pressure during Hot Extrusion of Aluminium
This article discusses the value of measurement techniques in laboratory studies of hot aluminium extrusion and evaluates the requirements to their accuracy. An established technique for measuring the profile surface temperature at the die outlet is combined with a die face pressure measurement technique. The article evaluates possible pressure sensor designs. The selected technique measures the deflection of a plate relative to a point where a capacitive probe has been attached. An in-site calibration technique provides accuracy of about ±10 MPa. The measurement technique can be applied to temperatures above 600°C and is only influenced by temperature changes to a limited extent. Rod extrusion serves as a test case for the sensor, and good agreement with simulation has been obtained. The sensors are also used in a study of dimensional variability during extrusion of a generic thin-strip.
Per T. MOE, Martin LEFSTAD, Robert FLATVAL, S. STØREN
aluminium extrusion, pressure, temperature, measurement, capacitive sensor.