Thermometry device null of the die component which it forms processes the glass formation item

摘要

PROBLEM TO BE SOLVED: To measure the temperature accurately where a glass material is molded through heating under pressure by securing a member having coefficient of thermal expansion higher than that of a member for measuring the temperature to the forward end of a thermocouple. ;SOLUTION: Upper and lower dies 1, 2 for molding a heated glass material 7 is provided with temperature measuring holes 8, 9. Thermocouple units 10, 11 are fixed, at the forward end thereof, with a tubular member having coefficient of thermal expansion higher than that of the upper and lower dies 1, 2 and secured to the temperature measuring holes 8, 9 through the tubular member. A space of specified dimensions is set between the tubular member and the temperature measuring holes 8, 9 prior to glass molding operation such that they come into contact with each other in the environment of glass molding temperature. Consequently, the thermocouple units 10, 11 are not subjected to clearance and can be mounted/demounted easily. According to the method, temperature can be measured with high accuracy approximately corresponding to that of actual temperature even under vacuum.;COPYRIGHT: (C)1998,JPO