共查询到17条相似文献,搜索用时 390 毫秒
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GSHM7060四轴联动卧式加工中心的研制 总被引:2,自引:0,他引:2
卧式加工中心是一种高效、高性能的数控机床,在一次装夹中可进行四个面的铣削、钻孔、扩孔、镗孔、铰削、攻丝等多种工序的加工,最适用于中、小批量、多品种的箱体零件以及曲型零件的加工。本文介绍了一种四轴联动卧式加工中心的机械结构,特点及其关键技术,通过建立高速加工中心机床的三维有限元模型,利用有限元分析软件对机床进行动力学分析,找出影响整机动态性能的薄弱环节并提出结构设计修改方向,从而使机床具有更好的静态、动态特性。 相似文献
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以DTM-B70车铣复合加工中心为例,对机床进行有限元动力学分析,分析机床的动态特性,为机床结构的动力学设计提供依据。研究了关键零部件动态特性结合面等效原理,介绍了支承件的结合面等效方法,基于支承件结构建立整机的有限元物理模型,分析其动态性能。根据动态特性分析,确定机床立柱为该机床薄弱环节,以便于后续对薄弱环节进行结构优化,提高部件的刚度和固有频率。 相似文献
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为了对CX8075加工中心底座进行合理设计,基于ANSYS有限元分析软件,对CX8075加工中心底座的动态性能进行了分析研究.通过对底座箱体支撑结构的修改,实现了对底座结构的优化设计,提高了底座的固有频率,使其有效地避开了机床的工作频段,达到了设计要求. 相似文献
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机床床身是机床的重要部件,它起着支撑立柱、工作台等部件的作用,其性能的好坏直接影响到机床的加工精度。在对HX7910五面加工中心床身结构动态优化设计过程中,建立HX7910五面加工中心床身的有限元模型,分析了其前六阶模态。根据分析结果确定筋板为优化对象,采用灵敏度优化法首先对床身内部筋板结构参数进行动态灵敏度分析。在灵敏度分析基础上,进行结构优化设计,得到了较优的结构参数,提高了加工中心床身的动态特性,从而提高床身的性能。 相似文献
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介绍在实验研究基础上自行设计柔性生产线专用加工中心的成功范例。研究过程中,综合使用了整机模态分析、零件有限元分析以及机床动态特性实验。机床设计中,引用了现代设计理论和方法。 相似文献
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针对高速主轴在数控机床中的推广应用问题,以加工中心高速主轴系统结构设计和性能分析为重点,应用虚拟设计原理、有限元分析和优化设计技术,对加工中心高速主轴系统在ADAMS环境下进行了动态仿真研究,开发了专用于机床主轴系统设计分析软件系统,给出了部分运行实例。该系统能提高产品的设计质量和设计效率。 相似文献
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机床静刚度是机床的重要性能指标之一,其试验与评价对机床结构的改善和加工精度的提高有着重要意义。以某型号立式加工中心为研究对象,通过Creo软件建立三维模型,利用有限元分析技术仿真分析数控机床结构。同时,基于LabVIEW设计一个机床静刚度测量系统,并对立式加工中心进行静刚度试验。试验结果与仿真结果误差为7.2%,验证了有限元模型的准确性。试验的机床刚度非线性度为±3%,说明该机床的性能较为稳定。 相似文献
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介绍了对某型号加工中心机床结构的有限元分析.详细分析了整机的前几阶模态.研究后发现由于立柱和支撑板设计的不合理,就会导致机床固有频率较低,振动增大,机床精度下降.针对加工中心机床部件的结构特点,对于立柱,筋板进行结构优选和设计参数优化,并对支撑板采用了拓扑优化和参数优化结合的方法.研究结果表明,通过有限元分析,加工中心... 相似文献
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Mi Liang Yin Guo-fu Sun Ming-nan Wang Xiao-hu 《Journal of Mechanical Science and Technology》2012,26(2):495-508
The machine tool joint is a very important factor in the overall machine tool dynamic analysis, and it has great effects on
the machining performance of a machine tool. As a very important operation parameter, preload greatly influences the stiffness
and the damping of a machine tool joint. This paper presents the effect of preload on the dynamic stiffness of the spindle
nose of a horizontal machining center. By discussing types and distribution of machine tool joints, studies on the joints
of ball screws, linear guides and bolts are carried out. The influence of preload on the axial stiffness of a ball screw is
calculated based on Hertzian contact theory and the effect of pretightening moment on pressure of bolt joint is discussed,
while the dynamic stiffness and the damping of a linear guide are identified by an optimum algorithm with the simulated and
experimental results. A finite element model (FEM) of the whole machine tool structure considering the effects of different
joints is created and verified against the test results, and then the influence of preloads on ball screws and linear guides
is predicted. Results indicate that preloads on machine tool joints have significant effects on the dynamic stiffness of the
spindle nose. 相似文献
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Wisley Falco Sales Marcelo Becker Alexandre G. Gurgel Jánes L. Júnior 《The International Journal of Advanced Manufacturing Technology》2009,42(9-10):873-882
Conventional threading operations involve two distinct machining processes: drilling and threading. Therefore, it is time consuming for the tools must be changed and the workpiece has to be moved to another machine. This paper presents an analysis of the combined process (drilling followed by threading) using a single tool for both operations: the tap-milling tool. Before presenting the methodology used to evaluate this hybrid tool, the ODS (operating deflection shapes) basics is shortly described. ODS and finite element modeling (FEM) were used during this research to optimize the process aiming to achieve higher stable machining conditions and increasing the tool life. Both methods allowed the determination of the natural frequencies and displacements of the machining center and optimize the workpiece fixture system. The results showed that there is an excellent correlation between the dynamic stability of the machining center-tool holder and the tool life, avoiding a tool premature catastrophic failure. Nevertheless, evidence showed that the tool is very sensitive to work conditions. Undoubtedly, the use of ODS and FEM eliminate empiric decisions concerning the optimization of machining conditions and increase drastically the tool life. After the ODS and FEM studies, it was possible to optimize the process and work material fixture system and machine more than 30,000 threaded holes without reaching the tool life limit and catastrophic fail. 相似文献
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