Development Of Optical Lens Molding Equipment Based On Induction Heating

Optical lens,especially optical glass lens,is not only widely used in all aspects of our daily life,such as electronic products,medical and health fields,but also widely used in the national strategic fields of aerospace,military and national defense.With the development of human society,the scientific research on optical lens and its processing technology has never been interrupted.In the optical lens processing technology,compared with the traditional material removal processing technology,the molding technology has the advantages of high efficiency,low cost,simple operation and so on.At present,the United States,Japan,Germany and other countries take the lead in the research and development of optical lens molding technology in the world.China’s research in this field started late,and it lacks of researchers in related fields.It has a certain distance from the world’s advanced level as a whole.Therefore,the independent research and development of molding equipment will be conducive to the development of this technology in China.Based on the principle of induction heating,a multi-purpose molding equipment was developed in this paper.The structure and control system of the molding equipment were designed,and the relevant forming experiments were carried out to test the system.This equipment is not only competent for the experiment of optical lens molding,but also can be used in the scientific research of other hot pressing fields,providing strong support for the research and production fields of materials,technology,equipment development,etc.First of all,this paper refered to the glass molding process,determined the design requirements,working principles,design tasks of the this equipment,and started the development of the equipment based on these.In the structural design of the equipment,according to the principle of system modular design,the structural design of the equipment was divided into the following parts: transmission system,induction heating system,mold structure,frame structure and auxiliary systems such as air circuit and water cooling.Put forward design scheme for different parts and selected relevant parts,then carryed out structural design.After the initial design was completed,the finite element analysis software ANSYS Workbench was used to analyze the heat transfer,static simulation and modal analysis of the relevant parts,so as to obtained the temperature cloud chart,the stress concentration position and the vibration characteristics of the system.According to these results to check the rationality of structure design,put forward reasonable water cooling scheme,structural improvement and optimization scheme,vibration prevention method,etc.In the design of the control system of the equipment,the overall scheme of one master and many slaves was first formulated.According to the functions,the control system was divided into motor motion control system,displacement measurement system,induction heating control system,pressure measurement system,remote control interaction system,air circuit and water-cooling control system.This paper designs the hardware and software of each part.Hardware design includes controller design,sensor and electrical component selection,while software design includes program logic,optimization program,interface design,etc.In addition,a data processing method based on differential method was proposed for the data collected directly.After the equipment was built and debugged,designed and carried out two different forming experiments,corresponding to different applications of the equipment.Two kinds of experiments are the setted pressure molding experiment and the setted displacement compression experiment.In the experiments,PMMA was used as the blank,and different pressing methods were used to make it deform in high temperature and vacuum.After completing the steps of heat preservation,pressure maintaining,cooling and shaping,opened the mold and taked out the finished products.During the experiments,the data of sensors were collected to analyze and verify the performance of the system.