光学玻璃精密模压成形设备密封设计

目的研究高温情况下光学玻璃精密成形设备加热系统的密封性能。方法通过数值模拟分析,得到加热系统的温度场分布以及密封圈的温度变化规律,利用热电偶及红外测温仪对加热系统加热性能及安全性进行检测,在此基础上,对加热系统进行改进。结果随着加热时间和功率的增加,密封圈的温度随之上升。模压温度过高,橡胶圈存在破坏的可能。结论通过对密封处进行改良,橡胶圈在安全工作范围内,加热效率得到了改善。在机械泵和分子泵的共同作用下,模压腔内的真空度达到1 Pa以下。

Sealing Design of Glass Precision Molding Machine

The paper aims to study sealing performance of the heating system of optical glass precision molding machine. The temperature distribution of heating system and temperature variation rules of seal rubber were obtained by finite element analysis. And the actual temperature of heating system was measured by thermocouple and infrared thermometer. On this basis, the heating system was improved to fulfill the safety and sealing performance of machine. The temperature of seal rubber increased with the increase of power and heating time. If the temperature was too high, the seal rubber may be burned. By improving the sealing, the seal rubber can be in safe working temperature range, and the efficiency of heating system is improved. Under the combined action of mechanical pump and molecular pump, the vacuum of molding cavity can be up to 1 Pa.