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1.
根据GPS规范,对轮廓法粗糙度数据处理提出了切实可行的方案并通过编程实现算法:利用最小二乘拟合法消除测量数据中的标称形状;将高斯滤波器输出函数离散化,实现数字滤波器,并利用该滤波器滤除噪声,将原始轮廓、粗糙度轮廓和波纹度轮廓进行分离。  相似文献   

2.
本文对外圆磨床磨削产生波纹度的原因、解决方法进行了深入分析与实验,获得了良好的效果,使工件表面波纹度大大降低,工件表面粗糙度的精度提高一级以上。一、产生波纹度因素分析为了分析外圆磨床磨削工件产生波纹度的因素,我们在一台旧式外圆磨床上进行了三种情况的磨削实验。 1.半径方向加工余量为0.025mm,手动走刀两次。  相似文献   

3.
表面综合形貌误差的灰色分离方法   总被引:1,自引:0,他引:1  
工件表面综合形貌误差由表面粗糙度、表面波纹度和形状误差等成分组成,各成分对工件的使用性能有着不同程度的影响.各种误差成分的无失真提取是进行表面综合形貌评定的核心和关键.本文将灰色误差理论应用到表面综合形貌评定中,提出了表面综合形貌误差的灰色分离方法,应用灰色动态滤波将表面形貌误差分离为表面粗糙度、表面波纹度和形状误差三项之和.该方法不要求被测表面的原始采样数据服从典型分布,可以对少数据表面轮廓进行误差分离,而且分离过程中不损失原始数据.仿真结果表明,灰色动态滤波是进行表面综合形貌误差分离的有效方法,其误差分离的结果与现行高斯滤波法具有良好的一致性.该方法可以作为国际标准的高斯滤波法的一种补充.  相似文献   

4.
商锦海 《轴承》2001,(2):36-37
轴承套圈滚动表面粗糙度和波纹度是影响轴承振动值的两个重要参数,在大量的试验中发现粗糙度和波纹度之间存在一定的相关关系,为了进一步确定两者之间的相关程度,利用回归分析法进行定量分析。1 数据收集针对两台较为稳定的内圈滚道超精机,每周对超精后零件随机抽检4件,测量其波纹度和粗糙度,在测得的大量数据中随机抽取10次40组波纹度和粗糙度值进行分析,所得数据见表1。表1 滚道表面粗糙度和波纹度  μm件号粗糙度Ra波纹度Wz件号粗糙度Ra波纹度Wz10.100.65210.070.4520.090.45220.060.3530.080.45230.060.2540.070.45240.050…  相似文献   

5.
为准确评价超精密金刚石刀具刀尖圆弧波纹度,对金刚石刀具刀尖圆弧波纹度的评价进行了滤波分析。介绍了刀尖圆弧波纹度的评价方法,针对关键的滤波环节,分析了高斯滤波、高斯回归滤波、样条滤波和小波滤波的原理,根据实际采样数据设计模拟实验对比了上述4种滤波器的滤波特性。结果表明,对于不同轮廓中线但高频分量完全相同的轮廓,样条滤波器的滤波效果优于高斯滤波器,并通过实际应用对比了高斯滤波器和样条滤波器。实验结果表明:对具有不同轮廓中线但高频分量完全相同的模拟轮廓,分别采用高斯滤波器和样条滤波器,当截止波长分别取0.25mm和0.8mm时,高斯滤波器滤波结果的标准差分别为0.4366nm和9.6544nm,样条滤波器滤波结果的标准差分别为0.0271nm和1.1844nm,说明样条滤波器更适合于超精密金刚石刀具刀尖圆弧波纹度的评价。  相似文献   

6.
尹龙  赵波  郭星晨  赵重阳 《中国机械工程》2021,32(10):1172-1180
针对传统加工方式难以获得轴承套圈较小的表面粗糙度和表面波纹度的问题,采用超声辅助内圆磨削的加工方法来改善轴承套圈的表面质量。基于超声内圆磨削单颗磨粒运动轨迹分析,建立了表面粗糙度的理论模型,通过对轴承套圈进行超声内圆磨削试验,研究了各个加工参数对轴承表面质量的影响。研究结果表明:超声内圆磨削加工方法可明显改善轴承的表面质量;增大超声振幅可减小表面粗糙度而表面波纹度会先减小后增大;随着砂轮转速的增大,表面粗糙度及表面波纹度会先减小后增大;磨削深度和进给速度的增大会使表面粗糙度及表面波纹度增大,但超声内圆磨削可减小它们的增加量。  相似文献   

7.
表面波纹度在磨损过程中变化机理的研究   总被引:1,自引:0,他引:1  
胡俊标 《机械制造》2001,39(6):30-32
通过对摩擦过程的大量实验研究,总结出表面波纹度对耐磨性的影响规律:摩擦件的耐磨性不仅与粗糙度有关,而且与波纹度也有联系。并提出控制表面波纹度可以提高零件耐磨性的观点。  相似文献   

8.
本文鉴于目前磨削加工中砂轮动平衡方法的不足,提出了一种简便易行的砂轮动平衡方法,并经实验证实该方法的可行性,进而研究了陶瓷磨削过程中砂轮动平衡对其表面粗糙度和波纹度的影响。  相似文献   

9.
基于多尺度理论的三维表面形貌表征研究   总被引:1,自引:0,他引:1  
首次将多尺度理论应用于三维表面形貌表征,采用不同的观察尺度对原始表面进行最小二乘、Motif法过滤,得到多尺度基面和多尺度表面,并基于WM函数进行图形、粗糙度参数表征研究。研究发现:多尺度理论的应用可以将形状偏差和波纹度视为某相对较大观测尺度下的粗糙度,并成功定量过滤,从而有效地解决传统粗糙度表征中形状偏差和波纹度的影响,提供一种契实可行的用于表征表面形貌和评定表面功能的理论或方法,更加准确地表达三维表面特性与其表面形貌参数的基本关系。  相似文献   

10.
基于Patir-Cheng平均流量理论,建立了考虑轧制界面粗糙度和轧件表面波纹度影响的混合润滑动力学方程.并以实验室冷轧硬铝过程为例,通过数值分析方法研究了表面波纹度、表面粗糙度、润滑液粘度系数等因素对于轧制界面压力和摩擦力的影响.  相似文献   

11.
Form errors are deviations of the machined surface from the geometrical surface excluding position errors, waviness and roughness. From a functional point of view, as for surface roughness, form error characterisation is also important. In the present work, an optical profiler is used to measure and numerically characterise form errors such as roundness and cylindricity of cylindrical surfaces. A double orientation method using mean value analysis has been applied to separate the workpiece error from the spindle error during roundness measurement. Software is developed for data generation, fitting the reference data for assessing form errors in terms of statistical and functional parameters including new parameters. An optical profiler measures all the surface irregularities and hence can be used to study both micro and macro errors of the profile measured. A study of both roughness and roundness parameters along the circumferential direction is made for the unfiltered signal using different filter cut-off values. It is known that filtering greatly affects the value of the form error parameters measured. The form measurements obtained by the optical profiler are compared with the stylus profiler and the results are presented.  相似文献   

12.
齿轮、轴承、凸轮等重载接触副的性能受表面粗糙度的显著影响。高负载情况下的摩擦因数与润滑接触面粗糙度的各向异性相关。测量的表面粗糙度可以分解为一系列具有不同波长、幅值的正弦表面粗糙度,因此,考虑各向异性正弦表面粗糙度,构建粗糙表面点接触瞬态弹性流体动力润滑(TEHL)模型,提出基于多重网格算法的粗网格构造新方法,提高粗糙表面润滑问题求解的稳健性。研究表面粗糙度各向异性对高负载情况下摩擦因数的影响规律。结果表明,粗糙度的各向异性影响接触面压力、油膜厚度分布、粗糙度形变量,从而影响摩擦因数。提出一个组合函数来量化粗糙度各向异性对摩擦因数的影响,表明全膜润滑到混合润滑的过渡不仅与载荷、速度等工况参数相关,还与粗糙度各向异性相关。  相似文献   

13.
The work deals with the development of a two-dimensional isotropic spline filter with application to the separation of components of the surface topography, i.e. roughness, waviness and form. An appropriate variational problem was formulated to define the mapping of primary surface data into filtered surface data with a transfer function of a circularly symmetric low-pass Butterworth filter of a given order. The variational problem was solved by approximating the filtered surface data by means of two-dimensional B-spline functions. The Fourier transform of the filter impulse response was determined to estimate the quality of approximation of the Butterworth filter and to select the appropriate filter cutoff. The paper presents one application of the designed filter to determine 3D roughness of an inner ring race of a ball bearing.  相似文献   

14.
Characterisation of the 3D waviness and roughness motifs   总被引:1,自引:0,他引:1  
S. Mezghani  H. Zahouani 《Wear》2004,257(12):1250-1256
The surface summits and their waviness envelope constitute the boundary surface of contact area during the tribological life of solids. The form, scale and orientation of the three-dimensional motifs play an important role on flatness behaviour of engineered surfaces, contact mechanics, adherence, friction, lubrication and leakage problems. The basic idea of this work considers that the three-dimensional motifs of the surface are a key elements of surface topography in regard to different field of tribology. The 2D motif is defined as the part of profile which associates tow peaks separated a deep valley (pit). The extension of the 2D motif definition to the 3D morphology needs the simultaneous assessment of waviness and roughness. The approach developed in this work is based on a geomorphologic definition of 3D motif. The approach is improved by a new algorithm of waviness envelope construction and a morphologic filter using the waviness envelope as a low-frequency surface of filtering.  相似文献   

15.
物体的表面结构形态在有些场合下对润滑状况有重要的影响作用.本文研究了考虑表面粗糙度的点接触问题的特点,建立了点接触的分析模型和接触物体表面的横向波形数学模型,应用多网格重积分方法求解了在给定条件下其与时间相关的弹流动压性能的解.主要分析了表面横向波形的点接触的润滑性能,揭示了油膜压力、油膜厚度在油膜接触区上随参数变化的特征和规律.  相似文献   

16.
In contrast to the mean-line based evaluation system, motif analysis and morphological filters are two techniques oriented to the characterization of functional properties of surfaces. The motif combination procedure is consistent with the functionality of the morphological closing filter that insignificant peaks on the profile are suppressed. By linking the functionality of the structuring elements with motif combination criterions, morphological envelopes are computed efficiently. Reversely the morphological closing filter coupled with horizontal line-segment structuring elements with lengths equivalent to the motif limits for roughness and waviness provides an alternative for motif analysis. The proposed morphological method has a sound mathematical basis and is stable. An example of applying the empirical motif method (ISO 12085) and the morphological method is demonstrated. The motif parameters resulted from two methods reveal that they coincide with each other. Thus two distinct function oriented methods for surface texture evaluation are technically correlated by mutual exploitation.  相似文献   

17.
The paper discusses a general methodology to the design of recursive Gaussian filters to be used for separating the form, waviness and roughness components of the surface texture. By selecting appropriate initial values for the filter difference equations, it is possible to eliminate the so-called edge effect and evaluate the whole registered profile. Two ways of filter implementation were considered: series and parallel. The incremental difference operator is applied in place of the usual shift operator z to describe the filter transfer function. This increases the accuracy of the representation of filter parameters and decreases the number of rounding errors. The results of the analysis were illustrated using 2D and 3D roughness profiles of a ball bearing race. The data show that the mean line and the mean surface were correctly determined for the whole area of the measured profile.  相似文献   

18.
Fitting of robust reference surface based on least absolute deviations   总被引:1,自引:0,他引:1  
Engineering surfaces comprise shape deviations namely form, waviness and roughness. For characterization of roughness, form and waviness are separated from the measured surface by establishing a reference surface that represents these deviations. This paper presents a new approach of simultaneously separating form and waviness deviations by fitting a reference surface that remains robust against the outliers such as deep grooves. A second degree polynomial and a set of sinusoidal functions are taken as basis functions to represent form and waviness respectively. A criterion of minimization of sum of absolute deviations (L1-norm) is considered as against the commonly used least squares (L2-norm) criterion and the reference surface obtained is found to be robust against outliers such as deep valleys in the measured surface. The superiority of the proposed fitting scheme is brought out by testing on different surfaces and comparing with the least squares method of fitting and the robust Gaussian regression filtering.  相似文献   

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