【作者】 张凯；

【导师】 王炳德；

【作者基本信息】 东北大学 ， 机械电子工程， 2015， 硕士

【摘要】 液压成形技术是现代最主要的轻量化先进塑性加工技术,是制备异型截面空体构件的精密成形技术,在汽车以及航空航天装备制造工业中具有广泛应用前景。近年来,伴随着液压成形技术在汽车以及航空航天装备制造业中的广泛应用,国内外学者对液压成形技术的研究也越来越深化,取得了很多突破性的进展。其中最重要的研究成果就是提出了管材液压成形工艺过程中的一种新的加载方式即脉动加载方式。所谓脉动加载方式是指在管材液压成形工艺过程中油液压力的变化是脉动的。近年来国内外很多学者都验证了脉动加载方式有利于提高管材液压成形的成形质量。因此,将脉动液压成形技术转化到实际的生产过程中,这对提高工件的成形能力和成形质量以及实现装备的轻量化、无余量化、高精度及整体化发展都具有很重要的积极意义。但由于管材液压成形技术的发展时间尚比较短,迄今为止,还没有比较成熟的配套设备能够实现脉动加载研究的实际工业转化,所以研制脉动加载专用装置就显得刻不容缓。超高压脉动加载油压的精确控制属于技术难题,一定程度上限制了该项技术的使用和推广。因此,本文在查阅大量国内外有关文献的基础上,综述了国内外超高压脉动发生装置的研究进展。针对国内外学者提出的不同脉动加载方式对管材成形的影响,提出了在新研发的超高压脉动发生装置中实现波动加载的要求,以完成不同加载条件下管材成形的实际加工和实验过程。论文中分析了液压系统中油液脉动的形成机理,并分析了油液压力的传播途径。提出了脉动油液的两种实现方式,并以此为基础设计了超高压脉动发生装置。阐明了设计的超高压脉动发生装置的工作原理,并对其重要组成部分增压器和脉动发生装置进行了结构参数确定。对超高压脉动发生装置的主要控制元件电动缸进行了设计,确定了其设计方案并对其组成部件的重要参数进行了确定。最后对所设计的超高压脉动发生装置进行了数学建模和仿真。更多还原

【Abstract】 Hydroforming technology is the most important technology in the advanced lightweight plastic processing technology.It is also the most important technology in the process of manufacturing the hollow body member with a profile cross section.So hydroforming technology has a broad application prospects in the automotive and aerospace equipment manufacturing industry.In recent years,with the hydroforming technology is widely used in the automotive and aerospace equipment manufacturing industry,the study of the domestic and foreign scholars in the technology is becoming more and more deepening and many breakthrough has been made.One of the most important breakthrough is that a new way of loading in the process of tube hydroforming has been come up with,namely the pulsating load.The pulsating load means that oil pressure changes in a pulsating way during the process of hydroforming.For the past few years,many scholars at domestic and abroad have verified that the pulsating load in tube hydroforming is beneficial to improve the forming quality.Therefore we should turn pulsating hydraulic forming technology to the actual production process,which can improve the forming ability and the quality of the workpiece.Also the turn has an important positive significance to the realization of the lightweight,everything in a quantitative and high precision and integration of the equipment.But due to the development time of hydroforming technology is short,so far we have not form a complete set of mature equipment to realize real industrial conversion of pulsating load.So the development of pulsating load device is urgent.Accurate control of superhigh pressure fluctuating belongs to the technical problems.To some extent,the problem limits the use and promotion of the technology.So this paper generally describes current status of pulsating load device on the basis of referring to a number of literatures home and abroad.Aiming at the impacts to tube hydroforming by different loading methods came up by overseas scholars,the writer presented to realize the fluctuation loading in tube high-pressure hydroforming so as to conduct the forming tests under different loading conditions.In the paper the formation mechanism of the pulsation of the oil in the hydraulic system and the transmission way of the oil pressure is analyzed.Also this paper puts forward two implementationsof fluctuation of oil.And on this basis,ultra-high pressure pulse generator is designed.Then this paper illustrates the working principle of the designed superhigh pressure pulse generator and determines the structure and parameters of pressure pulse generator and supercharger which are the important component of the superhigh pressure pulse generator.To superhigh pressure pulse generator,electric cylinder is the main control device.In the paper we determine the design scheme and important parameters of the electric cylinder.Finally,we make mathematical modeling and simulation for the designed ultrahigh pressure pulse generator.更多还原