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Dynamic Characteristic Analysis and Structural Modification of a Precise Horizontal NC Machining Center

Author: ZhangJinCai
Tutor: ZhangDaWei
School: Tianjin University
Course: Mechanical Manufacturing and Automation
Keywords: Finite Element Method Parameter Identification Dynamic characteristic Structural improvements LMS
CLC: TG659
Type: Master's thesis
Year: 2010
Downloads: 142
Quote: 0
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Abstract


With high - speed CNC machine tools to the development of high-precision , high surface quality and high productivity direction , just a good static stiffness has been unable to meet the needs of the machine tool design , its dynamic characteristics have become important indicators to evaluate machine performance . Structural dynamic characteristics related to many aspects of the processing efficiency of the machine tools , precision machining, production materials and manufacturing costs , the analysis of the dynamic characteristics of the structure has become an integral part in the machine design process . Machine Tool Plant of the industrial research Seiki production of THA6350 of precision Horizontal CNC machining centers for the study, the use of the LMS Test.Lab modal analysis software ANSYS finite element analysis software , and its experimental modeling and finite element modeling , after modal analysis to identify the weak links of the machine , and put forward a reasonable structure improvement program . At the same time , research bolted binding surface method to the variation of the tangential stiffness and damping modal , laid the foundation for further comprehensive study of the combination of surface features . The thesis was the work of the following aspects : 1 . Establish a three-dimensional digital model and finite element dynamic model of THA6350 horizontal machining center structure dynamic characteristic simulation analysis of machine tool parts , each order is given mode shapes and modal frequencies ; 2 . hammer pulse excitation method , experimental modal analysis of THA6350 horizontal machining center machine and columns , given the order modal frequencies and mode shapes , affected the machine is the weak link of the structural vibration resistance . For the structural dynamic characteristics of structure improvement program , and by means of finite element simulation to verify the effectiveness of the improvement program . The aid Lab modal analysis software , test and analysis under the conditions of different roughness , lubrication conditions , the contact area , preload size , bolt connection combined surface equivalent modal stiffness and damping change the law LMS Test. . In this paper, the experimental modal THA6350 finite element analysis , structural improvement program for machine tool manufacturers , at the same time through the equivalent of a fixed combination of surface parameters , laid the groundwork for the full range of a fixed combination of surface parameters characteristics .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > Program control machine tools, CNC machine tools and machining
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