大型龙门式机床横梁结构的可靠性分析
发布时间：2019-03-16 19:36
【摘要】：机床横梁结构的可靠性很大程度上影响机床整机的使用寿命及加工精度。本研究以某大型龙门铣床横梁为研究对象,通过改变横梁内部筋板结构的布置方式,结合workbench软件,运用概念建模方法,建立了米型、W型、O型三种横梁结构,并对它们的结构分别进行了优化及可靠性分析。本研究首先介绍了课题研究的背景及意义,阐述了如何对横梁结构进行优化进而提高横梁结构的可靠性,从而达到提高机床整体可靠性的目的。并简单介绍了可靠性理论的发展历史及国内外可靠性研究的发展状况。另外本研究分别对三种横梁结构进行了静力学分析,并运用响应面法对横梁结构进行了多目标优化。论文通过静力学结果结合响应面灵敏度分析方法筛选出对横梁结构刚度及强度影响较大的参数,并以所选参数作为优化的主要输入变量,横梁刚度和强度为输出变量进行横梁结构的优化。对优化后横梁结构进行重建及静力学计算,进行分析可知:响应面优化能够极大的提高横梁结构强度和刚度。本研究最后分别对横梁结构进行了可靠性分析,并详细介绍six-sigma可靠性分析的步骤,为其它结构的可靠性分析提供参考。可靠性分析结果显示:在同等工况条件下,米型梁结构相较于W型、O型梁结构具有更高的可靠性。为提高横梁结构的可靠性进而提高机床的制造精度和可靠性提供重要参考。
[Abstract]:The reliability of machine tool beam structure affects the service life and machining precision of machine tool to a great extent. In this study, the cross-beam of a large-scale gantry milling machine is taken as the research object. By changing the arrangement of the internal stiffened plate structure of the cross-beam, combining with the workbench software and using the concept modeling method, three kinds of cross-beam structures, I. E., W-type and O-type, are established. Their structures are optimized and their reliability is analyzed. Firstly, this paper introduces the background and significance of the research, and expounds how to optimize the cross-beam structure to improve the reliability of the cross-beam structure, so as to improve the overall reliability of the machine tool. The development history of reliability theory and the development status of reliability research at home and abroad are also briefly introduced. In addition, the static analysis of three cross-beam structures is carried out, and the multi-objective optimization of the cross-beam structures is carried out by using the response surface method. In this paper, the static results and response surface sensitivity analysis method are used to select the parameters which have great influence on the stiffness and strength of cross-beam structure, and the selected parameters are taken as the main input variables of optimization. The stiffness and strength of the beam are the output variables to optimize the cross-beam structure. The reconstruction and static calculation of the optimized beam structure are carried out. The results show that the response surface optimization can greatly improve the strength and stiffness of the beam structure. At the end of this study, the reliability analysis of cross-beam structure is carried out, and the steps of six-sigma reliability analysis are introduced in detail, which can provide reference for the reliability analysis of other structures. The reliability analysis results show that the o-shaped beam structure has higher reliability than the W-shaped beam structure under the same operating conditions. It provides an important reference for improving the reliability of beam structure and improving the manufacturing precision and reliability of machine tools.
【学位授予单位】：陕西理工学院
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG502.3
[Abstract]:The reliability of machine tool beam structure affects the service life and machining precision of machine tool to a great extent. In this study, the cross-beam of a large-scale gantry milling machine is taken as the research object. By changing the arrangement of the internal stiffened plate structure of the cross-beam, combining with the workbench software and using the concept modeling method, three kinds of cross-beam structures, I. E., W-type and O-type, are established. Their structures are optimized and their reliability is analyzed. Firstly, this paper introduces the background and significance of the research, and expounds how to optimize the cross-beam structure to improve the reliability of the cross-beam structure, so as to improve the overall reliability of the machine tool. The development history of reliability theory and the development status of reliability research at home and abroad are also briefly introduced. In addition, the static analysis of three cross-beam structures is carried out, and the multi-objective optimization of the cross-beam structures is carried out by using the response surface method. In this paper, the static results and response surface sensitivity analysis method are used to select the parameters which have great influence on the stiffness and strength of cross-beam structure, and the selected parameters are taken as the main input variables of optimization. The stiffness and strength of the beam are the output variables to optimize the cross-beam structure. The reconstruction and static calculation of the optimized beam structure are carried out. The results show that the response surface optimization can greatly improve the strength and stiffness of the beam structure. At the end of this study, the reliability analysis of cross-beam structure is carried out, and the steps of six-sigma reliability analysis are introduced in detail, which can provide reference for the reliability analysis of other structures. The reliability analysis results show that the o-shaped beam structure has higher reliability than the W-shaped beam structure under the same operating conditions. It provides an important reference for improving the reliability of beam structure and improving the manufacturing precision and reliability of machine tools.
【学位授予单位】：陕西理工学院
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG502.3
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