金型を用いて成形中のガラスの温度分布の計算

抄録

The temperature distribution in glass material was estimated by calculating the heat transfer in a transient state between glass and a metal mold for forming glass. It was followed by a comparison of the above-calculated data with Trier's experimental result to study any effect on the infrared-ray absorption on glass and the clearance between glass and a metal mold, with the results being is as follows:
(1) With regards to the effect of infrared-ray absorption on the cylindrical shape of glass, the temperature is low near the surface of colorless glass, but in slightly inside, the temperature is lower on green glass. In other words, temperature gradient is larger on colorless glass. This tendency accords with the result of Trier's experiment. In addition, in the center of glass, colorless glass having a smaller absorption coefficient shows a lower temperature.
(2) If the clearance between glass and a mold is supposed to remain unchanged in the result of Trier's experiment, the clearance on colorless glass and green glass is 46 and 40μm, respectively. If the calculation is conducted by varying the clearance between glass and the mold so as to match it to the results of the experiment, the clearance becomes 20-30μm 2s later, 80-90μm 4s later, 40-50μm 6s later and shows only a slight variation thereafter.