立式加工中心切削稳定性试验研究

发布时间：2019-01-11 20:32

【摘要】：随着高新技术的发展,机床技术进入了一个新的阶段,对工艺性能和加工性能有了更高的要求。机床颤振稳定性问题是复杂的非线性问题,直接影响到机床的加工精度和加工效率。因此,对机床动态性能研究,就是要提高机床的抗振性,并使其具有足够够高的稳定性。目前,对于机床振动方面的研究,尤其是颤振引起的稳定性问题的研究,大部分是关于切削过程理论模型及仿真方面的,在机床加工性能检测方面的研究主要是加工精度方面的,缺乏对机床切削稳定性的检测方法和检验标准。为此,本文以YCM-V65A型四轴立式加工中心为研究对象,对其颤振稳定性进行研究,设计了试验方法,并提出了一种通过试件来检测机床切削稳定性的方法。主要研究内容和成果如下:(1)建立动态铣削力和铣削过程动力学模型,揭示机床结构和加工过程与机床动态性能之间的联系,给出机床稳定性的判别方法。(2)用解析法对稳定性进行理论分析,利用MATLAB绘制了颤振稳定性叶瓣图,对机床切削稳定性的主要影响因素进行了分析,总结出了影响规律。(3)提出了一种颤振的在线实时监控及通过试件检测机床稳定性的方法。(4)设计了机床稳定性试验试件及试验方案,对YCM-V65A型四轴立式加工中心进行稳定性试验。首先进行模态试验和铣削力系数辨识试验,获取机床系统的模态参数和铣削力系数。然后绘制实际参数下的稳定性叶瓣图,最后利用设计的试件进行稳定性试验,分析试验现象,验证了理论模型的合理性。
[Abstract]:With the development of high technology, machine tool technology has entered a new stage, which has higher requirements for process performance and processing performance. The flutter stability of machine tools is a complex nonlinear problem, which directly affects the machining accuracy and efficiency of machine tools. Therefore, to study the dynamic performance of machine tool is to improve the vibration resistance of machine tool and make it have enough stability. At present, the research on the vibration of machine tools, especially the stability problem caused by flutter, is mostly concerned with the theoretical model and simulation of cutting process. The research on machine tool machining performance test is mainly on machining accuracy, and lacks of testing method and inspection standard for machine tool cutting stability. Therefore, in this paper, the flutter stability of YCM-V65A type four-axis vertical machining center is studied, the test method is designed, and a method to test the cutting stability of machine tool is put forward. The main research contents and results are as follows: (1) establish dynamic milling force and milling process dynamics model, and reveal the relationship between machine tool structure and machining process and machine tool dynamic performance. The method of judging the stability of machine tool is given. (2) the stability of machine tool is analyzed theoretically by analytic method, and the blade flap diagram of flutter stability is plotted by MATLAB, and the main factors influencing the stability of machine tool are analyzed. The influence law is summarized. (3) an on-line real-time monitoring method of flutter and a method to detect the stability of machine tool through specimen are proposed. (4) the test specimen and test plan of machine tool stability are designed. The stability test of YCM-V65A-type four-axis vertical machining center was carried out. First, modal test and milling force coefficient identification test are carried out to obtain the modal parameters and milling force coefficients of machine tool system. At last, the stability experiment is carried out by using the designed specimen, and the rationality of the theoretical model is verified by analyzing the experimental phenomena.
【学位授予单位】：天津理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG659

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