6063鋁合金超聲振動(dòng)鐓粗中的表面效應(yīng)研究
[Abstract]:Compared with traditional metal plastic forming process, ultrasonic vibration assisted forming can reduce forming force, metal flow stress and friction between workpiece and die. The plastic forming properties of metal materials and the surface quality and dimensional precision of final forming parts are improved. Ultrasonic vibration plastic machining has attracted more and more attention and research by scholars at home and abroad because of its series of advantages, and provides a new way to improve the plastic workability of materials. The experiment and numerical simulation of ultrasonic vibration assisted upsetting of 6063 aluminum alloy were carried out in this paper. The friction coefficient of specimen / die surface was measured, and the influence of ultrasonic vibration on plastic forming process was studied under different lubrication and vibration conditions. The numerical simulation of aluminum alloy upsetting process assisted by ultrasonic vibration was studied. The influence of ultrasonic vibration on the upsetting process of aluminum alloy 6063 was analyzed and the effect of ultrasonic vibration on the upsetting process of 6063 aluminum alloy was analyzed. The main research contents are as follows: using the ring upsetting method and the energy method to solve the radius of the shunt surface in the process of ring upsetting, the corresponding relationship between the pressure under the ring and the change of the inner diameter under the action of a family of friction factors is established. The theoretical correction curve of friction coefficient for ring upsetting experiment is drawn. The ultrasonic vibration-assisted upsetting experiment of 6063 aluminum alloy ring under different lubrication conditions was designed and carried out. The friction coefficient of the specimen / tool interface under different lubrication and ultrasonic vibration conditions was obtained, thus the friction coefficient of the specimen / tool interface under different lubrication and ultrasonic vibration conditions was obtained. Effect of ultrasonic vibration on surface friction of specimen / tool during upsetting process of aluminum alloy. The ultrasonic vibration upsetting experiments of 6063 aluminum alloy rings under different lubrication conditions and the same frequency and different amplitude were carried out. The forming load, forming stress, hardness and microstructure of ultrasonic vibration on 6063 aluminum alloy during upsetting were analyzed. The effect of ultrasonic vibration "surface effect" on parts is studied in this paper. The effects of surface morphology and surface roughness on parts are studied. The numerical modeling method of ultrasonic vibration-assisted upsetting forming process is studied by using ABAQUS finite element software, and the numerical simulation of ultrasonic vibration-assisted upsetting forming process is realized. The effects of ultrasonic vibration on the deformation velocity, contact pressure, contact area, friction force and friction coefficient of specimen / tool surface during upsetting forming were studied under different friction conditions by analyzing the numerical simulation process and the results of the numerical simulation, and the effects of ultrasonic vibration on the deformation velocity, contact pressure, contact area, friction force and friction coefficient of the specimen were studied. By comparing the simulation results with the experimental results, the influence of ultrasonic vibration parameters on upsetting forming process and its mechanism were obtained.
【學(xué)位授予單位】:山東大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TG663;TG319
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