机床导轨滑块结合面参数识别研究

在模态分析的基础上应用弹簧-阻尼单元建立机床导轨滑块的结合面动力学有限元模型,经过优化计算来识别机床导轨滑块结合面参数。结果表明:优化计算方法识别参数结果与简化单自由度方法所得的测试结合面参数相近,该方法又是识别机床导轨滑块结合面参数一种有效方法。     

模态试验在机床滑块导轨系统建模中的应用研究

机床结合面参数的正确与否,对整机有限元模型的建模精度具有举足轻重的作用.针对影响XH2725机床整机建模精度的关键结合面--滑块导轨结合面进行模态试验,测试结合面动力学特性,采用分量分析法得出结合面的特征参数并应用于机床整机的动力学建模.     

模态试验在机床滑块导轨系统建模中的应用研究

机床结合面参数的正确与否,对整机有限元模型的建模精度具有举足轻重的作用。针对影响XH2725机床整机建模精度的关键结合面——滑块导轨结合面进行模态试验,测试结合面动力学特性,采用分量分析法得出结合面的特征参数并应用于机床整机的动力学建模。     

基于结合面的高精度数控磨床动态特性

针对磨床中常见的螺栓结合面、导轨结合面,提出并建立三维弹簧-阻尼单元和接触单元的结合面有限元模型,并应用于某高精度磨床的动态特性仿真分析,同时对该磨床进行动态性能测试。将实验数据与有限元分析结果进行对比,验证模型的正确性。所得结论为基于结合面机床的动态特性分析提供了一种有效的有限元模型,对进一步整机动态特性分析和优化设计具有重要意义。     

基于实验模态分析的机床动态性能测试

根据实验模态分析理论,构建了实验模态分析系统.利用压电传感器和加速度传感器作为前端信号采集装置,通过7700Pulse软件采集激励信号和响应信号,然后应用ME’scope软件进行机床实验模态分析.以HMC630rp卧式加工中心整机及其立柱为研究对象开展模态试验,分析结果显示立柱是机床动态性能的薄弱部件,原因在于导轨滑块结合面动态性能较差.     

机床导轨结合面动刚度参数修正优化

目前,有限元方法已经广泛应用于机床分析及优化设计之中,有限元模型的准确性会对静动态分析产生巨大的影响,模态试验测试方法可以用于检验并修正模型。以某数控雕铣机为分析对象,将模态试验与有限元计算相结合,基于模态试验的动态参数测试结果,利用ANSYS Workbench有限元分析软件进行多目标优化设计,修正导轨结合面刚度参数,使矫正后的有限元模型更为准确地描述机床的动态特性。     

基于实验分析的机床结构有限元建模及其应用研究

针对一台数控弧齿锥齿轮铣齿机,进行机床整机的有限元动态和静态分析,测量机床静刚度,进行模态实验测试及分析.结合有限元模态分析结果,依据重要的实验模态和机床静刚度修正导轨结合部有限元模型参数.对机床整机结构进行改进,通过有限元分析计算,改进后整机结构动、静刚度明显提高.为确定机床导轨结合部模型参数提供一种研究思路与方法.     

多功能机床关键导轨副动态特性分析

针对多功能机床关键滑块导轨运动副HG45CA结构,采用东方所试验模态设备和CASP软件对约束状态的滑块导轨副进行了动态性能分析。试验研究得到的导轨滑块固有动态参数表明:滑块导轨运动副具有横摇、横荡、垂荡、首摇和扭转前5阶固有振型,其固有振动频率在300~1 000 Hz之间;试验得到的导轨滑块阻尼比在0.1以下,说明滑块导轨运动副属于粘性阻尼振动系统,并计算得到导轨滑块的刚度和阻尼值;试验结果为机床振动环境下导轨滑块的强迫振动性能奠定理论基础,并为进一步深入分析机床整体振动系统特点提供了关键参数。另外,导轨滑块的试验模态机理、试验方案和试验数据的分析为相关试验研究提供了借鉴。     

数控机床动态特性优化

考虑了滚动结合面和主要固定结合面的影响,对机床进行模态分析和谐响应分析,找出了其薄弱模态;通过分析可知改变各结合面刚度对整机动态特性的影响,识别出对整机动态特性影响较大的结合面,并对这些结合面刚度值进行优化,提高了整机的动态特性.     

数控机床滚动导轨结合面参数的特性分析

机床导轨结合面是影响机床特性的关键因素,在机床整机的建模分析中是必须要考虑的部分。根据滚动导轨结合面的模态试验结果和有限元分析结果,对导轨结合面的参数进行优化识别,得到导轨结合面的动刚度和阻尼,为机床整机建模分析提供了重要的依据。     

基于ADAMS的导杆摇杆滑块冲压机构的优化设计

为了提高冲压机构的设计质量,缩短和减少设计的周期和成本,针对导杆摇杆滑块冲压机构进行优化设计。通过对导杆摇杆滑块冲压机构工作原理的分析,建立了冲压机构的数学模型并确定了设计变量。利用ADAMS软件对该机构进行了参数化建模和运动仿真,然后以压力角最小和驱动力矩最小为优化目标对机构进行了优化设计,最终确定了影响压力角和驱动力矩的主要设计变量的参数。优化后的结果表明,冲压机构的压力角经过优化后减小了91.5%;驱动力矩减小了53.3%,优化效果明显。     

基于Pro/Engineer的导滑块车床镗孔夹具设计

通过对导滑块车床镗孔夹具的设计方法与过程进行探讨和分析,运用Pro/Engineer软件,采用以导滑块工件为基准参照的自上而下的设计方法进行夹具的装配结构三维设计,实现设计成果高准确度与设计工作的高效率,对保证制造精度和提高生产效率,减轻工人劳动强度,提高技术与经济的综合效益,具有重要意义.     

基于3D打印的直线导轨快速制造的应用研究

直线导轨与滑块分离时,精密排列的滚珠极易脱落,安装复位困难,为此提出一套解决方案：测量直线导轨的形状尺寸并通过UG建模,再采用3D打印快速成型直线导轨样品,并应用在教学实践中,收到了较好的效果。     

Synthesis of optimum slider-crank mechanismsCИ

For the spatial slider-crank mechanism formulas are obtained to allow the user determine the link sizes and slider offset for a predetermined stroke with an acceptable pressure angle at the extremes of slider travel as well as by a given angle between the crosshead guide of the slider and a plane in which the crank revolves. Formulas for determining the sizes of links of the plane slider-crank mechanism as a special case of the spatial mechanism are also presented. The particular cases of mechanisms havingequal angles of pressure as well as at extreme values of an angle between crosshead guide and the revolution plane of the crank are discussed. It is shown, that the plane mechanism case provides maximum slider travel when other things are equal.     

Experimental and theoretical evaluation of friction at contacting magnetic storage slider–disk interfaces

To understand better the friction force and wear processes at contacting slider–disk interfaces, we have developed an experimental method for measuring and a theoretical method for calculating the friction force. For this study, a slider with a 1500 μm² contact pad located at the recording head is burnished against a relatively rough disk (～12 Å rms), which ensures smooth sliding. In the experimental method, the friction force is measured as the disk is spun-down to bring the slider–disk interface into an increasing degree of contact. A modified air bearing code is used to determine the experimental normal contact force for each friction measurement. In the theoretical method, the friction force and other relevant interfacial forces are calculated using an improved sub-boundary lubrication (ISBL) rough surface model. The friction force calculation in this model is based on the force needed to induce yielding of the individual disk asperities contacting the flat surface of the contact pad without any assumption of the coefficient of friction. Good agreement is found between the measured and theoretical friction vs. normal contact force curves, indicating that the model is capturing the essential origins of friction at this interface. The model also provides valuable insights into how wear particles may be generated at this contacting slider–disk interface.     

Experimental Study on Lubrication Film Thickness Under Different Interface Wettabilities

This paper describes some experimental studies about the effect of interface wettability on hydrodynamic lubrication film thickness by a custom-made slider bearing tester. The lubricated contact pair consists of a fixed-incline slider and a transparent disc, and a thin lubrication film can be generated when the disc rotates. The film thickness was measured by interferometry. The wettability of different slider surfaces was evaluated by the contact angle of the lubricant on them. The relationship of film thickness versus disc speed was measured under different liquid–solid interfaces, and the results showed that slider surfaces with strong wettability to the lubricant could generate higher film thickness. Furthermore, case experiments were carried out to validate the hydrodynamic effect by tailored-slippage. By numerical simulations, the experimental findings were tentatively explained with the phenomenon of wall slippage.     

冷锻压力机肘杆尺寸误差对滑块运动精度的影响

分别采用理论和仿真分析了肘杆式冷锻压力机各杆长尺寸误差对滑块位置误差的影响规律,结果表明,两者近似呈线性关系。得到了对滑块位置误差影响程度较大的杆件,合理确定了杆件的尺寸公差。采用运动仿真研究了运动副间隙对滑块位置和速度的影响,提出了减小间隙的改进措施。     

基于刚柔耦合的导轨滑块移动副建模

以导轨滑块机构为例,讲述了其刚柔耦合仿真的具体实现方法.首先在SolidWorks中建立导轨滑块三维模型,然后在ANSYS中生成导轨柔性体的模态中性文件,通过软件接口导入到ADAMS中,从而得到所需的柔性体,将滑块设为刚体,生成柔性多体动力学模型,为精确进行动力学仿真和实际物理样机的制造提供了基础.     

Identification of the Spectrum Signature of Air-Bearing Slider Dynamics

Characterization of the motion of air-bearing slider with sub-10-nm clearance is becoming a critical aspect of developing advanced head–disk interfaces (HDI) in hard disk drives to achieve higher areal data densities. In this article, the response of sub-10-nm clearance air-bearing slider induced by a bump contact is recorded using laser Doppler vibrometer (LDV). To identify system dynamics in terms of spectral decomposition, the slider response is studied using FFT, power spectrum density, spectrogram, and Hilbert instantaneous spectrum analysis. The results demonstrate that the response of air-bearing slider in instantaneous contact exhibits nonstationary and nonlinear properties which can be accurately identified using Hilbert instantaneous spectrum. The interpretation and spectrum identification based on Fourier analysis and its extension in time–frequency domain could lead to inaccurate results due to their limitation in resolution and linearity assumption.     

基于UG和ADAMS的滑块联轴器的仿真分析

通过对滑块联轴器分别进行UG仿真及ADAMS仿真,对其中的半联轴器的转速进行运动学和动力学分析,得到半联轴器的2组速度曲线图。通过分析和对比2组速度曲线图,发现2组数据的各自平均值比较接近,但UG仿真后得到的数据曲线更加平稳,波动起伏比较小,而ADAMS仿真得到的数据曲线波动范围较大。这揭示了在将模型导入到ADAMS的过程中,确实存在一定的差异。本文的分析结论对2个软件的仿真精度分析具有一定的参考价值。