Papers by Author: Yuan Liang Zhang

Abstract: Micro gears are applied in an increasing quantity in many applications. Therefore, precise measurements are of growing importance to ensure their quality. This paper studies the electronic generative and automatic indexing measurement system in a micro gear (with a module less than 0.2mm) measuring instrument, and develops a loop proportioned driving approach and a stage-error compensation technique. The approach and the technique have been successfully applied in the micro gear measuring instrument developed by the authors. The experiment shows that the application of the approach and the technique greatly reduces the cost of measuring instrument, with simple control and reliable operation.

Abstract: While using natural diamond tool to cut stainless steel alloy, the cutting parameters have a great impact on tool life. The impact of cutting parameters on influencing cutting tool life was studied through experiments on using ultrasonic vibration to cut special stainless steel alloy. The experiments were conducted with various cutting speeds, different tool feed rates, altered cutting depths and adapted vibration parameters. Consequently, the relative curve between cutting parameters and tool life was obtained. The experimental results indicated that in the ultrasonic vibration the diamond tool can manufacture stainless steel alloy precisely and made surface quality well. The tool life depended on the spindle speed of machine tool as well as the amplitude and frequency of ultrasonic vibration to a large extent. Among the parameters which affect the processing quality, cutting speed was utmost, followed by feed followed, and the influence of back cutting depth was insignificant.

Abstract: Ultrasonic vibration is applied to diamond turning of special stainless steel to decrease diamond tool wear and improve the surface quality of the workpieces. It reviews the principle of diamond turning of special stainless steel by applying ultrasonic vibration combined with gas shield. Compared with the ordinary machining method, cutting temperature and cutting force are greatly reduced when machining by application of ultrasonic vibration, and the appetency between a diamond tool and Ferrous atom of a workpiece is also minimized as gas shield application. The Experiments of cutting special stainless steel workpieces show that the surface roughness Ra is less than 0.15μm and flank wear-width is less than 5μm when cutting distance is up to 2000m. It takes research on the effect of cutting parameters to surface roughness and tool wear. The experiment result shows that the amplitude is the most important factor which effects tool wear and surface roughness most.

Abstract: Piezoelectric servo mechanism, with its existing nonlinear response and hysteresis, restricts the precision greatly when applied to manufacturing of non-axisymmetric optic mirror. On the basis of theory analysis and experiments, this paper builds three kinds of feed-forward model of piezoelectric servo cutting system. According to these mathematical models, we make the compensation control to the cutting tool position, which results the maximum displacement error less than 0.04μm. And based on this method, experiments on machining non-axisymmetric optic surface of wave front corrector shows the Zernike relative error is less than 10%. So the compensation control of feed-forward control model of cutting tools position can efficiently counteract the influence of nonlinear response and hysteresis, which improves machining precision of non-axisymmetric optic mirror surface.