Overall Design And Heating System Development Of Optical Glass Precision Molding Equipment

With the growing demand for optoelectronic devices in the field of aerospace industry,health care and people's livelihood,especially the rapid development of electronic products such as mobile phones,digital cameras,car cameras,telescopes and medical microscopes,which not only led to the wide application of optical lenses,but also to promote the aspheric glass lens molding technology research and the development of related molding equipment,making the aspherical lens development for high pixel,high precision and light direction.The United States,Japan and Germany in the research of aspherical optical glass lens are in the front of the world,which have designed and research some relevant glass molding equipment.In our country,study of glass materials,the improvement of the molding process,the mold design of the mold and mold surface coating research are all too late to start and lacks of relevant engineering researchers,compared to the world's advanced technology,there is a considerable distance in china.Therefore,the development of optical glass precision molding equipment with independent intellectual property rights will have important practical significance for our optical electronics industry.The purpose of this project is to design and manufacture the optical glass precision molding equipment for molding the BK-7.The maximum heating temperature of the equipment is designed as 800°C,the molding temperature is higher than the conversion temperature of BK-7,the maximum mold pressure is designed as 30 kN,the maximum diameter of glass lens is designed as 110 mm,and the Coaxial error of the molded glass lens is less than 5?m with good surface quality.Two aspects will be mainly study on this paper.One is the overall design of the optical glass precision molding equipment and another is the detailed design of the heating system.In the overall design,according to the advanced experience at home and abroad,the height of the glass molding equipment's rack has been designed;ensure the accuracy of the mold system,and the position relationship of mold system with heating system,the choice of drive mode and molding process curve.In the heating system design,the advantages and disadvantages of various heating methods are analyzed,and shortwave infrared radiation is selected as the heat source.By comparing the heat pipe several different layouts,choose semi-circular heating pipe with its convenient installment and debug.The power range of the heating system is determined by calculation: 10 kW to 15 kW.The material and coating of the radiation screen are analyzed in detail and a more secure water-cooled device is used to heat it in the outer wall.Analysis of the vacuum of the quartz cover requirements,respectively,at both ends of the design of the O-ring static seal and Y-ring seal dynamic seal.The water ring cooling has been designed in order to ensure the sealing performance of the seal.The influence of the coating on the heating efficiency was simulated by simulation.The feasibility of the molding process was verified by the molding process simulation of the glass blank,and the structural design of the die holder was optimized.The heating rate of the heating system is 1~3°C/s.During the experiment,the reasonable heating rate can be selected.By measuring the temperature of mold,we get the conversion temperature 600°C of BK-7 after 30 min.Arriving the temperature of 800°C needs 12 min.The molding experiment of optical glass precision molding equipment was carried out and the molding results were analyzed.