【作者】 邢玉龙；

【导师】 刘杰；

【作者基本信息】 东北大学 ， 机械电子工程， 2008， 硕士

【摘要】 振动时效技术(Vibratory Stress Relief)是利用振动消除残余应力的技术手段,文章首先分析了研究振动时效技术的现实意义,指出振动时效技术比传统热时效与自然时效的极大优势所在,阐述了国内外振动时效技术的研究现状,并提出了振动时效技术需要进一步解决的问题。振动时效技术的实质是要消除工件内部的残余应力,提高工件的松弛刚度和尺寸稳定性,文章从残余应力的产生机理出发,建立残余应力的力学模型,运用微观力学的方法分析位错及其塞积群的应力场,研究外力作用下塞积的开通与残余应力释放的关系,得出了释放内部残余应力的宏观激振动应力条件,并分析了振动时效对金属构件疲劳寿命的影响以及振动时效技术的适用性。振动时效工艺的关键技术在于工艺参数的选择和时效效果的评定。文章分析了振动时效过程中结构动态参数的变化,给出了激振力、激振频率和激振时间——三个最重要的工艺参数的最佳选择原则,并对参数曲线评定振动时效效果的方法做了详细的分析。针对振动时效技术所要完成的功能,文章指出了振动时效设备的设计要点,并对振动时效控制器做了详细的电路与程序设计分析,并利用Protel软件绘制了相关功能模块的电路原理图,使用虚拟仿真软件KeilC51μVision2和Proteus进行了模拟仿真。最后使用研华公司生产的PCL-818L数据采集卡结合虚拟仪器设计软件LabVIEW设计了一个振动时效控制系统。最后对本课题做了总结和分析,指出了课题的不足之处和未完成的工作,提出了以后在这些方面深入研究的一些想法和建议。更多还原

【Abstract】 Vibratory stress relief is a technology method to eliminate residual stress with vibration. This paper analyzes the practical significance of VSR (Vibratory Stress Relief), pointing out the advantage of VSR than the traditional methods, such as heat treating and natural aging. The article also describes current research findings on VSR technology at home and abroad, pointing out the some pending problems of VSR, which will be researched in this paper.VSR technology, in essence, is to eliminate the work piece internal residual stress, increase relaxation stiffness and dimensional stability of the work piece, so the thesis is started with the conception and production mechanism of residual stress, establishing residual stress mechanical model. The paper obtained dynamic stress condition of making the internal residual stress gain macroscopic release by using the microcosmic mechanics method to analyze the dislocation and stress field of its crowded group and studying the relation between the elimination of crowded group and stress release under the external force. The article also analyzes the influence on metal components’ fatigue endurance after VSR and the applicability of VSR technology.The most important technology of VSR process is the choice of technological parameter and evaluation of effect with VSR. Change of structure dynamic parameters is analyzed under VSR processing. The article also describes the most optimum choice principle of three key parameters in VSR process—vibration force、vibration frequency and vibration duration, and the parameter curve evaluating method is discussed deeply in this thesis.According to the essential functions of VSR equipment, the paper indicates the design point of VSR equipment, and designs detailed circuit and programs of the VSR control casing. Schematic diagrams of correlative function modules has been drawn in Protel and simulated with KeilC51 and Proteus. A control system of VSR has been designed with PCL-818L in the LabVIEW environment.In the end, the deficiency of this issue and immature work has been mentioned; some standpoints and suggestions have been given in the future research.更多还原