Studies On Simulation And Manufacturing Technology Of Chalcogenide Optical Glass Molding

With the increasing use of infrared optical systems,chalcogenide optical glasses are valued because they can be processed by molding processes.And using the finite element simulation method to simulate the glass molding process,through simulation analysis and discussion of how to select the glass molding process parameters,this numerical analysis method has increasingly become the mainstream method for the study of chalcogenide optical glass molding manufacturing technology.This article takes the above content as the background of the topic,focusing on the development of finite element simulation analysis and manufacturing technology of chalcogenide optical glass.Firstly,this paper analyzes and elaborates the precision molding technology of optical glass and the characteristics of molding materials.Secondly,the finite element simulation numerical analysis method and the establishment of the simulation model are studied.The research idea of this thesis is to use finite element simulation software to simulate the optical glass molding environment,and then analyze and optimize the optical glass molding process.For the part of the finite element simulation analysis,establishing molding process model in finite element software MSC.Marc with the thermodynamic properties of chalcogenide optical glass material Ge₂₃Se₆₇Sb₁₀.The effect of Molding temperature,Friction coefficient and Molding speed on equivalent Von Mises stress after molding of chalcogenide optical glass was investigated and the method of selecting the molding process parameters is analyzed.Through the comparison with the molding simulation data of L-BAL42,the difference between the molding process of chalcogenide glass and traditional visible light glass is discussed.According to the results:Equivalent Von Mises stress decreases with the increasing mold temperature,the decreasing friction coefficient and the increasing mold speed,Compared with the control material,the chalcogenide material Ge₂₃Se₆₇Sb₁₀ is most suitable for the purpose of changing the equivalent stress by changing the molding speed.Moreover,due to the influence of the optical glass molding process,the residual stress of the upper and lower surfaces of the molded optical element shows a regular distribution.In the experiments of chalcogenide optical glass element molding and measurement of the surface accuracy of the molded element,three groups of different mold pressure rates were used to mold the sulfur-based optical glass element preform.Through the measurement experiment,the molding pressure is 0.03 mm/s,and the molding pressure is best.At this time,the PV precision of the profile lens is less than 1?m,and the surface roughness Ra is less than 10 nm,which meets the design requirements for the surface shape accuracy of the molded component.The experimental results show that the precision molding process theory of the chalcogenide glass and the optimization effect of the finite element analysis method on the glass molding process.The purpose of using an optical glass precision molding process to achieve effective,low-cost processing and shaping of chalcogenide glass infrared optical components.