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德国马尔便携式表面粗糙度仪PS 10怎样选择正确的滤波

编辑:无锡诺和锐特自动化设备有限公司  时间:2017-05-31

德国马尔便携式表面粗糙度仪PS 10怎样选择正确的滤波

 

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Surface measuring unit: MarSurf PS 10

粗糙度测量单元:MarSurf PS 10

ISO 4288 requires the selection of the cut-off wavelength of the profile filter to distinguish between periodic and aperiodic surface profiles. Here you will find the basics of surface metrology and the choice of the right filter.

ISO 4288要求对剖面滤波器的截止波长进行选择,以区分周期性和非周期的表面轮廓。本文一起来了解表面测量基本技术以及如何进行正确筛选。

Selection of the cut-off wavelength.

选择截止波长

Following procedure is recommended:

建议采取如下步骤:

  • Trial measurement λc = 0.8 mm to determine the parameters RSm, Rz and Ra

    假设以λc =0.8mm来测定参数RSm,Rz和Ra

  • Assessment of the profile

    评估轮廓

  • For a clearly recognizable periodic profile: choice of cut-off wavelength according to the parameter RSm from the table depicted below

    针对清晰可识别的周期性轮廓:按下图所示RSm参数来选择截止波长

  • Otherwise: choice of cut-off wavelength λc according to Rz and /or Ra

    否则,根据Rz和/或Ra选择截止波长λc

If the selection of  λc = 0.8 already leads to a positive result, it must be as certained whether or not the next smaller λc value is also compliant with the standard specifications: For a filter setting according to standards, the smallest possible λc value must always be selected that matches the table values according to ISO 4288.

若所选λc=0.8已得出相对应结果,必须确定下一个较小的λc值是否也符合标准规格:根据ISO 4288标准,需筛选最小可能λc值且结果也须与下表中相关值匹配。

 

Cut-off wavelength λc

截止波长λc
If the upstream and downstream distances also have the length of the cut-off wavelength λc, the scanning distance of a roughness measurement has a total length of 7 limit wavelengths. This property is, however, device-specific: there are surface measurement devices, such as the MarSurf PS 10, in which the roughness scanning distance is only 6 limit wavelengths. That is, when the pre-and post-travel are only half a cut-off wavelength. This dependency of the scanning distance from the measuring device is not at variance with the standard, since the standard defines only the length of the measuring path, but not the length of the scanning path.
如果计算加速和减速的距离以及截止波长λc的长度,那么粗糙度测量的扫描距离就有7个极限波长。然而,这一特性是取决于测量设备的:如马尔便携式粗糙度仪MarSurf PS 10,其粗糙度扫描距离仅为6个极限波长,也就是说,加速和减速距离只有滤波长度的一半。因为标准仅定义了评定的长度而没有定义测头行程,所以测量设备扫描距离的依据与标准不一致。

Recommendations for selecting the cut-off wavelength λc

选择截止波长λc 的建议

  • Visual inspection and / or nail test – test area clean, periodic or aperiodic?

    目测检查和/或用手触摸判定:测试区是否清洁,周期性或非周期性

  •  Automatic selection of λc, if possible – otherwise: λc selection after visual inspection, experience or tolerance specification

    如果可能的话,自动选择λc,否则先经过目测、经验或公差要求判定后再进行λc选择

  • Possibly. Correction of λc according to ISO table

    可能的话根据ISO表修正λc

  • Repetition of the measurement with next shorter λc-value – important especially in case of tolerance excesses!

    在公差过大的情况下,需重点重复测量下一个更短λc值

The ISO 4288 standard provides precise specifications for a standardized selection of the cut-off wavelength λc for periodic and aperiodic surface profiles.

ISO 4288 标准为周期性和非周期性表面轮廓的截止波长λc 提供了精确的规范依据。

 

Meaning of the parameters


相关参数的定义

At the latest since the publication of DIN EN ISO 4287, many additional surface characteristics are available. However, the various parameters have also acquired a very different meaning in practice. Among them are also characteristics that are rarely applied or have not been internationally distributed.

最新出版的DIN EN ISO 4287,有许多表面特性可供选择。然而,不同的参数在实践中也被赋予不同的含义。这些特征中仅少数参数被应用或被国际接受。

Meaning of the most common parameters

最常见参数定义

Average roughness Rz

平均粗糙度深度Rz

The average roughness depth Rz is the arithmetic mean of the individual roughness values: the sum of the Rzi values is divided by the number of measured individual measuring distances Ir. Like Rmax, Rz is a measure of the surface roughness perpendicular to the test surface. Rz, however, depends less than Rmax on individual profile features: for repeat measurements, Rz values scatter less than Rmax values.

平均粗糙度深度Rz是单个粗糙度深度Rzi在连续的采样长度上的算术平均值:Rzi值的总和除以测量距离Ir的个数。和Rmax一样,Rz也是一种垂直于测量表面的粗糙度检定的参数,但Rz在单段轮廓上的决定性要低于Rmax:重复测量时,Rz值小于Rmax值。

 

Forexample: Rz = Σ Rzi / 5.

例如:Rz = Σ Rzi / 5.

Mean roughness value Ra

粗糙度值Ra含义

The arithmetic mean roughness value Ra is the arithmetic mean of the values of all profile values of the roughness profile. Ra is the most commonly used roughness parameter in the world. It is easy to measure, well reproducible in repeat measurements, but makes almost no statement about the characteristics of individual profile features. It is therefore only suitable for evaluating the function of workpiece surfaces in combination with other surface parameters described here.

粗糙度平均值Ra是轮廓纵坐标绝对值的算术平均值。Ra是世界上最常用的粗糙度参数,很容易测量,在重复测量中很容易重现,但几乎无法体现单段轮廓的特性,因此,仅适用于结合本文中所提及的其他表面参数来评定工件的表面粗糙度。

 

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