外文翻译--超声表面滚压Q345液压支柱工艺参数对表面粗糙度的影响研究 英文版

Study on the Effect of Ultrasonic Surface Rolling Processing Parameters on the Surface Roughness of Q345 Hydraulic Prop Guangyi Meia, Kehua Zhangb and Jinfu Dingc Transportation College of Zhejiang Normal University, JinHua 321004, China , b , c Keywords: Ultrasonic rolling, Machining parameter, Surface roughness, Hydraulic prop Abstract. The surface roughness of the hydraulic prop had an important effect on the wear resistance, fatigue strength and property of fit. The ultrasonic surface rolling extrusion (USRE) processing experiment was employed to improve the surface roughness of the hydraulic prop, some machine parameters such as the tools transfer magnitude, feed were studied in detail, the contact style roughness tester( Mahr S2) was used to test the surface roughness of the workpiece. The experiment results showed that the USRE could improve the surface roughness evidently, the Ra value from 0.976m reduce to 0.105 m by one-hit machining. The feed was linear with the surface roughness, and when the tools amplitude was 6.58.5, there were a better surface roughness Ra 0.090m. USRE processing the surface time and again could improve the surface state. Introduction The hydraulic prop was a tangent pile that could be used fit the hinge the top beam or exclusive use； it was the matching equipment for mechanized mining. The hydraulic prop was the important mine safety appliance, the machining surface quality have important effect on the usability: 1.effect on the abrasion resistance, the surface roughness have an important effect on beginning period of the friction, far from that as little as may be surface roughness, there are a best parameter for the friction about 0.321.25m. 2. Effect on the fatigue strength, the uneven surface and flaw on the surface would cause stress concentration and bring about fatigue and fracture, so the contact surface should be finished and enhance the fatigue strength.3.effect on the corrosion resistance, the corrosion matter are easy to accumulate on the roughness surface, so reducing the surface roughness could enhance the corrosion resistance.4.effect on the property of fit, if mating on the rough surface the tolerance clearance would be increased by the wear and tear of the property of fit, so the precision and rigidity of fit would be cut down, it would impact the stationarity and the reliability1,2,3. So the mating surface must be finished. In order to high effective improve the surface state of the workpiece, a new machining technology ultrasonic surface rolling processing (USRP) was put forward, the USRP used the ultrasonic vibration to supply the energy to extrude the surface of workpiece 4, 5 This processing method has the fewer elasticity pressure, friction force, and surface roughness would reduce soon, and the surface hardness and abrasion resistance enhances observably. In this processing, the processing parameter such as axial direction, static pressure and amplitude of vibration decided the last surface state 6, 7. Ultrasonic Rolling Experimental System and Principle Ultrasonic Rolling Experiment Device. The ultrasonic rolling experiment device was shown in Fig. 1； it was composed of ultrasonic generator 8, transducer 6, amplitude transformer 5 and toolhead 2. The ultrasonic oscillation was translated to the mechanical vibration by the transducer, the amplitude was enlarged by the amplitude transformer, and then the energy was translated to the toolhead for finishing. The toolhead 2 was screwed joint with device, in the processing the relative rotative were generated between the workpiece surface and the toolhead. Advanced Materials Research Vols. 102-104 (2010) pp 591-594Online available since 2010/Mar/09 at (2010) Trans Tech Publications, Switzerlanddoi:10.4028//AMR.102-104.591All rights reserved. No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of TTP,. (ID: 40-30/12/10,04:12:50) The Processing Principle. In the ultrasonic rolling processing, the toolhead generated mechanical vibration that was caused by the ultrasonic generator and feed along the workpiece surface. So the static pressure and ultrasonic vibration were translated to the workpiece surface (as the Fig. 2 show). The macro-scale elasto-plastic deformation would generate by the extrude action. After processing, some recovery of elasticity would take place on the processed surface. So the plastic flow would change the asperity of workpiece, reduce the surface roughness and enhance the combination property of the finished surface 5. Fig. 1 The Schematic of the Ultrasonic Rolling Device Fig. 2 Principle of USRP 3 Fig. 3 The photo of the locale processing Experiment Materials and Conditions Experiment Materials. The experiment materials was Q345 hydraulic prop whose dimension was 97980mm, the element of Q345 steel was almost same with the 16Mn steel, there are some trace alloy element V, Ti and Nb in the Q345, this trace alloy element would grain refinement and enhance the tenacity, so the synthesis mechanic of the Q345 steel were improved large scale. The initial surface roughness value was Ra 0.4m. Experiment Condition. The conventional processing technic of hydraulic prop were lapping first and then polishing, the needed surface roughness value was Ra 0.4m. In this experiment, the ultrasonic rolling processing was used to substrate the lapping and polishing. The experiment was carried on NC turning machine, the locale processing photo was shown in Fig. 3. The surface roughness value was measured by the Mahr S2. Experiment Results and Discussion The Processing Amplitude Impacted on the Surface Roughness of Workpiece. The ultrasonic rolling processing was employed to study the amplitude impact on the surface roughness value, the experiment parameter were that speed of main shaft was 710 rmin, the feed was 0.12 mmr, and the static pressure was 140N, processing the surface three times. The amplitude VS surface roughness was shown in Fig. 4, the relative of the amplitude and surface was not monotonic function, suitable to 592 Digital Design and Manufacturing Technology enlarge the amplitude would improve the surface roughness, but excess some value the surface roughness value would deteriorate. g3g3g3g3Fig. 4 The relation between the amplitude of tool and surface roughness The Feed Impact on the Surface Roughness. The experiment was employed to study the feed impacted on the surface roughness, the ultrasonic rolling processing with different feed was carried, the feed VS surface roughness relative was shown in Fig. 5, and the feed was linear relation with surface roughness. g3Fig. 5 The relation between the surface roughness and feed The Processing Static Pressure Iimpacted on the Surface Roughness. In the ultrasonic rolling processing, the tools with some static pressure and definite feed speed to processing the rotate workpiece surface to make the workpiece materials elasticity and plasticity deformation. After the tools pass by the workpiece surface would take place elastic recovery. The metal flow would caused the vale being filled with the asperity，so the surface roughness would be improved. As Fig. 6 showed that the static pressure increased and the surface roughness reduced. g3Fig. 6 The relation between static pressure and surface roughness The Spindle Speed and Axial Feed Impacted on the Surface Roughness. The ultrasonic rolling processing experiment was employed to study the spindle speed and axial feed impacted on the surface roughness, the processing parameter was static pressure 140N and amplitude 13m, every workpiece was processed three times and the relative of the spindle speed and axial feed VS surface Advanced Materials Research Vols. 102-104 593 roughness was shown in Fig. 7. Surface roughness value increased with the raising of the axial feed and spindle speed. g3Fig. 7 The effect of the spindle speed and axial feed for the surface roughness Conclusions In this research the ultrasonic rolling processing experiment was employed to substitute the conventional rolling processing technic. The effect rule of the spindle speed, axial feed, static pressure and amplitude impacted on surface roughness value was investigated, if the processing parameter selected suitably, the surface roughness value would improve evidently and reach about Ra 0.1 um. So the ultrasonic rolling processing could efficiently replace the lapping and polishing in the hydraulic prop finishing processing. In ultrasonic rolling processing with 20KHz work frequency, the rational processing parameter for the Q345 hydraulic prop: spindle speed 710 r/min, axial feed 0.12mm/r, the static pressure 140N, amplitude 13.2m , the roller radii 3mm and the roller materials adopted the cemented carbide. Acknowledgement The authors gratefully acknowledge the funding for this work from Natural Science Foundation of Zhejiang Province (Grant No. Y106187) References 1 L.F. Han, S.G. Qu and W. Xia: Machine Tool and Hydraulics, (2007), p. 19-21 (in Chinese) 2 M.H. El-Axi and M.M. El-Khabeery: Journal of Materials Processing Technology, (2003), p. 82-89 3 D.P. Wang, N.X. Song, T. Wang, et a1: Journal of Tianjin University, (2007), p. 228-233 (in Chinese) 4 X.J. Liu: Mechanical Research and Application, (2007), p. 38-39 (in Chinese) 5 L. Chen: Journal of Materials Processing Technology, (2008), p. 439-450 (in Chinese) 6 F.G. Cao: Chemical Industry