共查询到18条相似文献,搜索用时 156 毫秒
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机车发动机机体主轴孔的镗修,目前在全国范围内尚无高效率的专用设备。文中对机车发动机机体主轴孔加工专用组合镗床的镗杆利用I-DEAS Master series 5.0软件系统进行了有限元分析。分别分析了不安装浮动支承和安装浮动支承两种情况下的镗杆振型,证明在安装浮动支承之后,镗杆的挠度可以满足机床的要求,对超长镗杆的设计和性能分析具有一定的参考价值。 相似文献
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针对大长径比镗刀杆在加工大型复杂零件的孔及孔系结构中容易产生振动、加工效率低且加工质量不稳定等问题,提出了一种内置双级串联调谐质量阻尼器的新型减振镗杆,建立了减振镗杆的力学等效模型,通过求解和分析减振镗杆的振幅比,确定了减振镗杆最优的阻尼器长度及阻尼比。利用MATLAB/Simulink分别求解减振镗杆和普通镗杆的加速度响应信号,结果表明,减振镗杆的吸振性能显著提高,振动衰减时间大幅缩短。应用Workbench对两种镗杆进行模态分析和谐响应分析,得到固有频率和幅频曲线,发现减振镗杆的振幅远小于普通镗杆。本研究为减振刀具的研制与推广提供了一定的理论参考。 相似文献
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深孔镗削是提高深孔加工精度的一种方法,它能校正己有孔上的缺陷,如圆度误差、直线度误差,从而获得良好的几何精度和表面粗糙度。深孔镗削的加工方式、运动形式、镗刀的轨迹方程和对镗削的受力分析是深孔镗削加工中各不稳定因素的渊源,在深孔镗削过程中,运用合适的镗削方式可以减小切削系统的振动。针对多刃均布式深孔镗刀,在推镗和拉镗方式下进行受力分析,并利用PRO/E建立镗杆几何模型并生成中性几何文件,通过ANSYS有限元法,计算出推镗和拉镗时镗杆产生的挠度以及最大应力应变曲线,将二者结果进行比较,证明在细长管时拉镗加工的优势。 相似文献
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本文对振动影响进行了分析,并在此基础上对减振镗杆进行了初步的设计,并对镗杆的结构、材料、弹性元件、质量块等重要参数都进行了选择设计,通过ADAMS与ANSYS软件对镗杆进行了联合仿真分析,又进行了实际加工对比。最终得出减振镗杆的优越性,对数控镗杆加工的减振措施有一定的意义。 相似文献
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主轴内孔加工技术的研究是大型电机研制的重要环节.文中首先根据项目要求提出了四种镗杆的设计方案并加以分析.然后根据四种方案进行了相应的有限元静态分析,分析结果表明方案四由于形成框架结构,且在镗杆尾部插有硬质合金棒,其刚性提高,静变形最小. 相似文献
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随着现代高速切削技术的发展,刀杆的振动严重影响着加工精度和刀具耐用度。对于深孔精加工的镗杆,由于其长径比大,吃刀量小,工件转速高,在切削过程中容易产生高频振动,甚至会产生共振,导致切削无法进行。为了减小镗杆的振动,根据振动学理论,在尽量不降低刚度的同时通过减少镗杆质量来提高其固有频率,利用ANSYS软件对不同结构的镗刀杆进行模态分析和静力分析,提取前四阶固有频率和镗刀尖的位移,从而对镗杆结构做出最佳设计。 相似文献
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Xianli Liu Qiang Liu Shi Wu Rongyi Li Haining Gao 《The International Journal of Advanced Manufacturing Technology》2018,98(1-4):95-105
In deep hole boring process, long and flexible boring bars are often used. Due to the large length-to-diameter ratio, the stiffness of the boring bars is inevitably reduced, where the boring bars’ vibration effects will occur. The influences of vibration will significantly degrade the accuracy and the surface quality, or even lead failure of the production. Therefore, it is of significant importance to develop techniques to reduce vibration in deep hole boring. In this paper, a new boring bar with a variable stiffness dynamic vibration absorber (VSDVA) is presented, where the basic parameters of the proposed boring bar are measured. Based on the proposed dynamic model, the vibration characteristics of the proposed boring bar are analyzed, and the change laws of the vibration reduction performance are obtained under different excitation frequencies. A new vibration reduction method is proposed, where best vibration reduction performance can be achieved by adjusting the stiffness of the VSDVA. Finally, the vibration reduction performance of the proposed boring bar is validated and evaluated by boring experiments. These works could provide guidance for designing new types of boring bars, selecting cutting parameters, and adjusting the vibration reduction performance of the proposed boring bar, and as a result, it provides a new design idea for the design of boring bar. 相似文献
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Henrik kesson Tatiana Smirnova Lars Hkansson 《Mechanical Systems and Signal Processing》2009,23(8):2629-2647
Boring bars are frequently used in the manufacturing industry to turn deep cavities in workpieces and are usually associated with vibration problems. This paper focuses on the clamping properties’ influence on the dynamic properties of clamped boring bars. A standard clamping housing of the variety commonly used in industry today has been used. Both a standard boring bar and a modified boring bar have been considered. Two methods have been used: Euler–Bernoulli beam modeling and experimental modal analysis. It is demonstrated that the number of clamping screws, the clamping screw diameter sizes, the screw tightening torques, the order the screws are tightened has a significant influence on a clamped boring bars eigenfrequencies and its mode shapes orientation in the cutting speed—cutting depth plane. Also, the damping of the modes is influenced. The results indicate that multi-span Euler–Bernoulli beam models with pinned boundary condition or elastic boundary condition modeling the clamping are preferable as compared to a fixed-free Euler–Bernoulli beam for modeling dynamic properties of a clamped boring bar. It is also demonstrated that a standard clamping housing clamping a boring bar with clamping screws imposes non-linear dynamic boring bar behavior. 相似文献