ANSI B46 PDF
Find the most up-to-date version of ANSI B at Engineering ASME B / ANSI/ASME B – Surface Texture and Gaging for Screw Threads Package ASME B and ANSI/ASME B The ASME B46 1 ANSI ASME. The American Standard for Surface Texture in ANSI B gives Ra as the standard surface finish designation. In most applications where RMS is called.
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Surface Finish- Typical values
These lines are marked Z 0. The angular spectrum is calculated by the following formula:. These parameters are the density of summits, the texture direction, the dominating wavelength and two index parameters.
The Radial WavelengthSrwis the dominating wavelength found in the radial spectrum. This parameter is only meaningful if there is a dominating direction on the sample. Maximum Valley Depth Sv: For an anisotropic surface the correlation length is in the direction perpendicular to the surface lay.
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For a Gaussian height distribution S vi approaches 0. With this definition the Stdi value is always between 0 and 1. For a Gaussian height distribution S bi approaches 0. The fractal dimension, D, for each direction is then calculated as. Before the calculation of the roughness parameters we recommend carrying out a anso correction by a 2 nd or 3 rd order polynomial plane fit.
Mean HeightS mean is the mathematical mean height of all pixels. It also defines parameters for specifying surface texture.
Valley Fluid Retention Index. Note, also that roughness values depends strongly on measurement conditions especially scan range and sample density. They are defined as the height difference between the highest and lowest pixel in the image.
Note,that negative peak artifacts may cause this parameter to be underestimated and in such cases it might be appropriate n46 perform some noise filtering. The amplitude sum, A aat a line with the angle, ais defined as:.
The Texture Direction IndexStdiis a measure of how dominant the dominating direction is, and is defined as the average amplitude sum divided by the amplitude sum of the dominating direction:. If the surface is fractal the Log Log graph should be highly linear, with at negative slope. Subscription pricing is determined by: The table lists the roughness parameters by their symbol, name, corresponding 2D standard and unit.
The advantage of this is that deviations from the bearing plane can be quantified better when setting the bearing plane to zero see how this is done in the Plane Correction Dialog section. Proceed to Checkout Continue Shopping. As the voice of the U. When there are less than five valid maximums or five h46 minimums, the parameter is not defined. For images consisting of parallel ridges, the texture direction is parallel to the direction of the ajsi.
Having found r 0. Three parameters are calculated based on this figure. The Qnsi Point Height, S10 zis defined as the average height of the five highest local maximums plus the average height of the five lowest local minimums:.
For Gaussian height distributions S ku approaches 3. If there is a very dominating wavelength, Srwi is close to 0, and if there is no dominating wavelength, it is close to 1.
The Mean Half Wavelength, Shwis based on the integrated radial spectrum:. The Dominating Radial Wavelength, Srwcorresponds to the semicircle with radius, znsi maxhaving the highest amplitude sum, b max: For these parameters we require the images to be quadratic. Parameters associated with the two-dimensional DIN standard are also calculated based on the bearing area ratio curve.
The Surfaces Area Ratio, S drexpresses the increment ahsi the interfacial surface area relative to the area of the projected flat x,y plane:.
ASME B – Surface Texture (Surface Roughness, Waviness, and Lay)
The spatial properties are described by five parameters. The functional parameters for characterizing bearing and fluid retention properties are described by six parameters. It is therefore important to include the measurement conditions when reporting v46 data.
Already Subscribed to this document. The Density of SummitsSdsis the number of local maximums per area:.
Area Root Mean Square Slope. Dominant Radial Wave Length. The Texture DirectionStdis defined as the angle of the dominating texture in the image. The Fractal Dimension, Sfd is calculated for the different angles by analyzing the Fourier amplitude spectrum; for different angles the amplitude Fourier profile is extracted and the logarithm of the frequency and amplitude coordinates calculated. The line having the angle, awith the highest amplitude sum, Amaxis the dominating direction in the Fourier transformed image ani is perpendicular to the texture direction on the image.
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Large values of S ci indicate that the void volume in the core zone is large. Root Mean Square Gradient. This standard is also available in these packages:. Note, that since SPIP version 4.