| 摘要 |
PROBLEM TO BE SOLVED: To restrain the dispersion in a shape of a molding caused by the weight difference of a glass material, the difference of molding shapes and the difference of setting positions, or the like, by controlling a pressing pressure added to a die while using the die temperature and the shaft position as the conditions to decide the pressing pressure in order to allow the thickness of an optical glass element to have a set value at a press step in the cooling process to mold by a glass molding method. SOLUTION: The pressing pressure is controlled so that the pressure is increased when the difference between the shaft position in the pressing direction of the molding die and the target position is small in comparison with that of the die temperatures and the pressure is decreased when it is large. The device for molding the optical glass element is provided with a detection means for detecting the die temperature and the shaft position, respectively, comparison means for comparing the detected values with the target values, respectively, and a pressing pressure control means for successively deciding/controlling the pressure based on the compared results. The device is also provided with upper and lower molding dies 1, 2, an upper side press shaft 3, a load cell 4 for measuring the pressing pressure, and an electric servomotor 5 for driving the shaft 3. The position of the shaft 3 is decided by a pulse signal to be sent to the servomotor 5.
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