Research On Single-point Diamond Turning Technology Of Chalcogenide Glass

Chalcogenide glass is an amorphous material with excellent infrared transmittance,high transmittance,low dispersion,low refractive index temperature coefficient and other characteristics.It is widely used in infrared detection,infrared imaging,infrared communication and other fields.At present,grinding is the main processing method of sulfur-based glass,but single-point diamond turning technology has shown the advantages and prospects of high precision,high efficiency and high surface quality.Although single-point diamond turning technology has great potential in processing sulfur-based glass,there is relatively little research on the process system of controlling high-precision surface quality of sulfur-based glass optical elements by single-point diamond turning technology at home and abroad.Due to the low fracture toughness of sulfur-based glass,brittle fracture is prone to occur during the processing,and micro-cracks and pits are likely to appear on the surface,resulting in surface roughness of sulfur-based glass optical elements that does not meet the requirements of optical system.Therefore,the research on the process system of controlling high-precision surface quality is crucial for the development of single-point diamond turning technology of sulfur-based glass.At the same time,it is necessary to explore the physical properties and processing mechanism of sulfur-based glass,and conduct more mechanical properties research,to provide strong support for the optimization and development of single-point diamond turning technology.The main purpose of this paper is to explore the single-point diamond turning technology of sulfur-based glass,and provide an effective processing scheme for the manufacture of sulfur-based glass optical elements.The specific research contents include:Firstly,by conducting nanoindentation and scratch experiments,the mechanical properties of sulfur-based glass were studied,and the load-displacement curves were recorded.Then,the elastic modulus and hardness were adjusted by using a semi-elliptical model to obtain the material property parameters of the turning model,which laid a foundation for accurately describing the elastic-plastic material model of sulfur-based glass turning simulation.Then,by using finite element analysis software to simulate ultra-precision turning of sulfur-based glass,the influence rules of process parameters such as cutting parameters and tool geometric characteristics on machining surface quality were studied.This study provides a powerful guidance for the subsequent process optimization experiment,which has important guiding significance for determining the reasonable process parameters of single-point diamond turning of sulfur-based glass.Finally,aiming at machining sulfur-based glass elements,Taguchi method was used for optimization.According to the simulation analysis results,reasonable process parameters were selected for orthogonal experimental study,and the effects and correlations of each process parameter on improving machining surface quality were explored to determine the optimal process scheme.At the same time,based on the experimental data,linear regression analysis was carried out to establish a surface roughness prediction model,which can effectively predict the cutting results.