共查询到19条相似文献,搜索用时 234 毫秒
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根据高速刀柄在不同过盈量下的联接性能分析结果与不同转速下的锥面接触应力分布规律,提出了一种锥面分段开孔高速刀柄的设计方法,即对刀柄定位锥面按照锥体素线长度均等分成前、中、后三段,并在各段的中等分处周向均布一组盲孔,通过调控盲孔的数量与尺寸使刀柄锥面达到一定的柔度。文章阐述了盲孔开设参数对锥面接触应力、柔度的影响规律和参数确定原则,给出了以HSK-E50为原型的锥面分段开孔设计案例,采用有限元分析其极限转速和锥面接触应力分布情况。结果表明,锥面分段开孔刀柄与原型刀柄相比,极限转速提高了约10.79%,锥面接触应力分布显著均匀。 相似文献
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空心短锥刀柄在数控机床上起到连接主轴与切削刀具并传递力矩的作用。刀柄与主轴连接性能的可靠性对机床的加工精度及工作安全性有重要影响。由于加工和装配等误差、实际过盈量和实际夹紧力等结构和性能参数具有不确定性,考虑到HSK工具系统中这些参数的不确定性,利用区间模型描述这种不确定性,建立了HSK刀柄与主轴连接接触面区间接触应力模型,提出了HSK刀柄与主轴连接性能的非概率可靠性模型,给出了可靠临界转速的概念。通过对HSK-A63刀柄性能的分析与计算,说明了该方法的合理性与可行性,为防止HSK刀柄与主轴的连接失效,保证数控机床的加工精度和使用的可靠性提供了理论基础。 相似文献
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利用SolidWorks建模软件建立HSK刀柄模型,再使用有限元方法,对HSK-100A型主轴/刀柄联结特性进行分析和模拟,研究了在夹紧力、过盈量、刀柄几何尺寸等条件下对联结锥面上间隙的影响,分析得出各参数的变化对锥面间隙的区域分布和大小有一定的影响。这可以对刀柄的几何参数优化提供理论依据。 相似文献
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并联机床电主轴干涉校验 总被引:6,自引:1,他引:5
具有空间复杂曲面加工能力的六轴联动的并联机床 ,动平台倾斜角一般应在左右 ,甚至更大。在动平台中心安装上电主轴后 ,由于动平台倾斜角的原因 ,在并联机床理论工作空间内 ,电主轴与 6根变长驱动杆之间可能会发生干涉 ,而且电主轴尺寸的不同 ,干涉发生范围也不同。本文讨论了电主轴与 6根驱动杆之间干涉计算问题 ,给出了干涉校验计算方法和公式 ,并用MATL AB5 .2软件设计了运行程序 ,这对已制造的并联机床 ,可作干涉校验 ,确定工作空间内电主轴的结构尺寸 ,或根据新的电主轴尺寸重新确定机床工作空间 ;对新的设计 ,先选定电主轴后 ,其尺寸参数 ,可作为干涉约束条件 ,可计算得到无电主轴干涉的并联机床设计参数 相似文献
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高速主轴过盈联结特性研究 总被引:5,自引:0,他引:5
高速主轴是高速切削技术的核心部件,其与电动机转子间的过盈量的大小是影响主轴的几何精度、运动精度、加工精度的关键因素。高速主轴与转子间的联结特性不仅受到初始装配公差的影响.还受到离心力的影响,且随着转速的提高。离心力的影响也越来越大。因此.设计过盈联结时.必须综合考虑接触应力、扭矩和转速对联结特性的影响。文章研究了高速主轴过盈联结的特性,分别推导出了高速主轴在静态和动态条件下过盈量和接触应力的理论公式。上述公式的推导有助于高速主轴过盈联结的设计。提高主轴的运动特性和加工特性。 相似文献
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高速主轴系统切削稳定性直接影响产品的表面加工精度和切削系统的使用寿命,是评价高速主轴系统性能优劣的重要因素,而研究影响切削稳定性的因素并制定提高稳定性的合理途径同样也受到关注。提出从稳定性评价准则及系统频响函数的不同求解方法入手,分析无条件稳定区和有条件稳定区的影响因素,总结出系统所受激励、主轴转速及系统结构是影响切削稳定性的重要因素。以德国GMN高速主轴系统为例,在采用5自由度轴承受力与变形关系模型模拟角接触球轴承和分布式弹簧模型模拟主轴-刀柄-刀具结合部的基础上,建立完整高速主轴系统通用有限元模型;利用三维稳定性叶瓣图、极限切削深度和叶瓣交点随参数的变化曲线表征切削力幅值、转速及阻尼比等参数对切削稳定性的影响规律,为优化加工工艺、提高系统切削稳定性提供理论依据。 相似文献
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Chih-Cherng Chen Nun-Ming Liu Ko-Ta Chiang Hua-Lun Chen 《The International Journal of Advanced Manufacturing Technology》2012,63(5-8):797-815
The vibrations on the cutting tool have a momentous influence for the surface quality of workpiece with respect to surface profile and roughness during the precision end-milling process. Singular spectrum analysis (SSA) is a new non-parametric technique of time series analysis and forecasting. The significant features of the cutting tool vibration signals from the sensors are extracted and transformed from the SSA-processed vibration signals. In the present study, SSA is applied to extract and transform the raw signals of the vibrations on the cutting tool for investigating the relationship between tool vibration and surface roughness in the precision end-milling process of hardened steel SCM440. In this experimental investigation, the spindle speed, feed rate, and cutting depth were chosen as the numerical factor; the cutting feed direction and holder type were regarded as the categorical factor. An experimental plan consisting of five-factor (three numerical plus two categorical) d-optimal design based on the response surface methodology was employed to carry out the experimental study. A micro-cutting test was conducted to visualize the effect of vibration of tooltip on the performance of surface roughness. With the experimental values up to 95% confidence interval, it is fairly well for the experimental results to present the mathematical models of the tool vibration and surface roughness. Results show that the effects of feed rate and cutting depth provide the reinforcement on the overall vibration to cause the unstable cutting process and exhibit the result of the worst machined surface. The amplitude of vibration signals along the cutting feed direction is generally larger than that along other direction. The spindle speed and tool holder type affect the stability of cutting tooltip during the cutting process. 相似文献
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高速加工热缩加长刀杆与刀具配合径向夹持刚度分析 总被引:1,自引:0,他引:1
建立热缩加长刀杆与刀具配合的有限元模型,给出一种合理确定模型中接触刚度系数的有效方法.随后对不同过盈量、夹持长度及主轴转速对热缩加长刀杆与刀具配合的径向夹持刚度的影响进行分析.最后在建立径向夹持刚度测量方法的基础上,对有限元分析结果进行验证.结果表明,合理的接触刚度系数是正确建立热缩加长刀杆与刀具配合有限元模型的关键;热缩加长刀杆与刀具配合间存在有合理的配合过盈量与夹持长度,以保证配合间夹持均衡而具有很好的夹持刚度,又不至使刀杆强度超过其屈服条件而降低刀杆的使用寿命和精度;当转速超过一定范围时,应考虑离心力对热缩加长刀杆与刀具配合径向夹持刚度的削弱作用. 相似文献
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Chao Xu Jianfu Zhang Zhijun Wu Dingwen Yu Pingfa Feng 《The International Journal of Advanced Manufacturing Technology》2013,67(5-8):1517-1525
Dynamic behavior of spindle–holder taper joint is critical in the spindle system of machine tool, related to the machining process. The parameters of the holder joint are significant for the spindle–holder system. This paper developed a new approach to investigate the dynamic behavior of the taper joint in modeling and parameters identification. Firstly, dynamic model is illustrated in both radial and axial directions based on the pairs of spring and damping. And frequency response function is used to identify the unknown modal parameters of frequencies and damping ratios. Secondly, a platform is designed and manufactured to establish the testing system in order to investigate the taper joint. Furthermore, taper joint of a BT50 holder is investigated, and the pre-force at the end of holder is the main consideration during the testing. The results show that the dynamic stiffness increases with the increasing of pre-force at the end of the holder. In addition, the paper discusses the phenomenon in microstructure based on peak-hollows model and the joint parameters are proved to be workable through simulation. The joint parameters are instructive to the design and manufacturing of the spindle. 相似文献