Study on microvibration experiment system of ultra-precision grinding optical aspheric surfaces

分析超精密磨削加工中砂轮微小振动对工件表面质量的影响,建立磨削中振动引起工件表面轮廓误差的数学模型,设计相应的超精密磨削加工微振动试验系统,用以模拟磨削过程中砂轮径向、横向的微小振动和摆动.结果表明:合理选择砂轮振动频率或工件主轴转速能有效提高工件表面精度,降低表面波纹度.Analysed the influence of the abrasive wheel microvibration to the workpiece surface quality on ultra-precision grinding process, and established a mathematical model describing how vibration led to the error of workpiece surface profile. Designed the corresponding microvibration experiment system of grinding process, which can simulate radial vibration, transverse vibration and oscillation of wheel on machining process. The results showed that, with appropriate wheel vibration frequency or appropriate workpiece rotate speed, the surface precision of workpiece can be improved.国家863计划资助项目(8638042416

Study of analog system based on small vibration in ultra precision grinding machining

文章分析了加工过程中产生的振动现象以及砂轮振动对工件表面精度的影响 ,设计了超精密磨削加工砂轮微振动的模拟系统。该系统可模拟实际磨削过程中砂轮径向、横向和微小振动和摆动 ,为研究不同的磨削加工参数下砂轮的振动及其对工件表面精度的影响奠定的实验基础。This paper analysec the occurred vibration and the influence caused by vibration of wheel, and then an analog system based on small vibration in ultra precision grinding machining is presented. This system can simulate radial vibration、transverse vibration and oscillation of wheel on machining process. This paper aims at establishing an analog system, which is helpful to study the influence parameters of variation of wheel on the workpiece surface when adapting different machining parameters.国家 8 6380 4 2 4 1 6资助项

Modeling and Experimentation of Ultra-precision Grinding of Asphercial System

超精密磨削加工已广泛应用于轴对称非球面光学元件及硬脆材料的加工中,加工过程中砂轮的不平衡量和机床主轴引起的砂轮微小振动和摆动将直接影响工件表面质量。本文分析了加工过程中产生的微振动现象,建立磨削中振动引起工件表面轮廓误差的数学模型;设计一套微振动实验系统,建立系统动力学模型并进行实验研究。实验结果表明:优化选择砂轮转速、工件转速和加工进给速度,可有效减小砂轮振动,提高工件表面精度。Ultra-precision grinding is widely used in process on axis-symmetrical aspherical elements and hard-brittle material,the micro vibration and swing evoked by imbanlance of the grinding wheel and principal axis of the machine tools affect the surface quality of the elements directly.Micro vibration phenomena appeared in the processing was analyzed,a mathematic model about the error of elements' surface figure evoked by vibration was built,a experiment system of micro vibration was designed and a dynamics model of the system was built.The result of experiment shows that choosing a reasonable grinding parameter can effectively reduce vibration of the grinding wheel and improve the precision of elements' surface.国家“863”高科技资助项目(8638042416