Experimental study on the reliability and the precision maintenance of the ultra-precision grinding machine based on the key subsystem platforms

Pengli Lei,Yunfeng Peng,Chenchun Shi,Zhenzhong Wang,Zuhui Liu,Feng Lu

doi:10.1007/s00170-021-08314-6

Abstract

The development of high-reliability, high-precision large-scale CNC ultra-precision grinding machines is essential for the efficient processing and manufacturing of large-diameter optical components. In this paper, we studied the reliability and the precision-maintenance of the ultra-precision grinding machine tool experimentally. First, the subsystems with poor performance were identified based on former operating data, which turned out to be the hydrostatic spindle subsystem and the feed subsystem. Then, we set up specific experimental platforms for these two subsystems to study the thermal deformation and thermal characteristics. The temperature difference between the inflow and outflow oils of the hydrostatic systems is used as the key parameter to model the accuracy evolution. Our results may provide a method to reveal the relationship between the thermal characteristics and the operating parameters of the subsystems, and therefore compensate the thermal error of the whole ultra-precision grinding machine.

Highlights

Large-diameter aspherical components are widely used in high-tech applications such as aerospace, military industrial optics and laser technology[1,2,3], while the ultra-precision processing of large-diameter optical components is a complex systematic project involving precision machine tools, numerical control, processing technology and process, precision inspection and compensation control
The various machining errors of ultra-precision machine tools directly affect the machining accuracy of the processed components
Thermal error occupies a large proportion of the workpiece machining error, and the thermal deformation of the machine tool has become the main source of error in the precision and ultra-precision machining process[6,7,8,9]

Summary

Introduction

Large-diameter aspherical components are widely used in high-tech applications such as aerospace, military industrial optics and laser technology[1,2,3], while the ultra-precision processing of large-diameter optical components is a complex systematic project involving precision machine tools, numerical control, processing technology and process, precision inspection and compensation control. The research and development of ultra-precision grinding machine tools are of great significance to meet the high-efficiency processing and production of largediameter optical components [4,5]. The various machining errors of ultra-precision machine tools directly affect the machining accuracy of the processed components. Thermal error occupies a large proportion of the workpiece machining error, and the thermal deformation of the machine tool has become the main source of error in the precision and ultra-precision machining process[6,7,8,9]. For long-running machine tools, especially in ultra-precision machining, the machining error caused by the thermal deformation will be very significant. There have been a lot of research work and results on the reliability and accuracy retention of machine tools[10,11,12]. Setting up specific experimental platforms for the key parts of the machine tool is an effective method for the research on the subsystems of the whole machine[13]

Methods

Results

Conclusion