Key terms and definitions
(1) Sampling length l
The length of the sample is the length of the reference line specified for the determination and measurement of the surface roughness, which is sampled over the general course of the profile.
(2) Evaluation length Ln
Due to the varying degrees of inhomogeneity of the machined surface, in order to adequately and reasonably reflect the roughness characteristics of a surface, a length of surface length necessary for the evaluation is specified, which includes one or several sample lengths, referred to as the evaluation length Ln.
(3) contour center line m
The contour center line m is a reference line for evaluating the surface roughness value.
Evaluation parameters and values <br> <br> the state by the height parameter of surface roughness parameter, pitch parameter and the integrated parameters.
There are three height parameters:
(1) Outline arithmetic mean deviation Ra
The arithmetic mean of the absolute value of the contour offset within the sampling length l.
(2) Microscopic unevenness 10 points height Rz
The sum of the average of the largest contour peak heights over the length of the sample and the average of the five largest contour valley depths.
(3) Maximum contour height Ry
The distance between the contour peak line and the contour bottom line over the length of the sample.
There are two spacing parameters:
(1) Outline single peak average spacing S
The projected length Si of the highest point of the two adjacent contours on the center line is called the contour single peak spacing. Within the sampling length, the average value of the contour single peak spacing is the contour single peak average spacing.
(2) Average spacing of contour microscopic irregularities Sm
A midline length Smi containing a contour peak and an adjacent contour valley, called the contour microscopic uneven spacing.
Comprehensive parameters: contour support length rate tp
The profile support length ratio is the ratio of the profile support length np to the sample length l.
Measurement of Surface Roughness The surface roughness measurement <br> <br> following four methods:
(1) Comparative method comparison method is a commonly used method in workshops. The surface to be tested is compared with the roughness sample, and judged by the naked eye or by means of a magnifying glass and a comparative microscope; the roughness of the surface to be processed can also be judged by the feeling of hand touch and nail swipe. This method is generally used for approximate evaluation of large roughness parameters.
(2) Light-cutting method The light-cutting method uses the "light-cutting principle" to measure the surface roughness.
(3) Interferometry Interferometry is the use of the principle of optical interference to measure surface roughness.
(4) Needle drawing method The needle drawing method is to directly measure the surface roughness Ra by using a stylus directly on the surface to be tested.
(1) Sampling length l
The length of the sample is the length of the reference line specified for the determination and measurement of the surface roughness, which is sampled over the general course of the profile.
(2) Evaluation length Ln
Due to the varying degrees of inhomogeneity of the machined surface, in order to adequately and reasonably reflect the roughness characteristics of a surface, a length of surface length necessary for the evaluation is specified, which includes one or several sample lengths, referred to as the evaluation length Ln.
(3) contour center line m
The contour center line m is a reference line for evaluating the surface roughness value.
Evaluation parameters and values <br> <br> the state by the height parameter of surface roughness parameter, pitch parameter and the integrated parameters.
There are three height parameters:
(1) Outline arithmetic mean deviation Ra
The arithmetic mean of the absolute value of the contour offset within the sampling length l.
(2) Microscopic unevenness 10 points height Rz
The sum of the average of the largest contour peak heights over the length of the sample and the average of the five largest contour valley depths.
(3) Maximum contour height Ry
The distance between the contour peak line and the contour bottom line over the length of the sample.
There are two spacing parameters:
(1) Outline single peak average spacing S
The projected length Si of the highest point of the two adjacent contours on the center line is called the contour single peak spacing. Within the sampling length, the average value of the contour single peak spacing is the contour single peak average spacing.
(2) Average spacing of contour microscopic irregularities Sm
A midline length Smi containing a contour peak and an adjacent contour valley, called the contour microscopic uneven spacing.
Comprehensive parameters: contour support length rate tp
The profile support length ratio is the ratio of the profile support length np to the sample length l.
Measurement of Surface Roughness The surface roughness measurement <br> <br> following four methods:
(1) Comparative method comparison method is a commonly used method in workshops. The surface to be tested is compared with the roughness sample, and judged by the naked eye or by means of a magnifying glass and a comparative microscope; the roughness of the surface to be processed can also be judged by the feeling of hand touch and nail swipe. This method is generally used for approximate evaluation of large roughness parameters.
(2) Light-cutting method The light-cutting method uses the "light-cutting principle" to measure the surface roughness.
(3) Interferometry Interferometry is the use of the principle of optical interference to measure surface roughness.
(4) Needle drawing method The needle drawing method is to directly measure the surface roughness Ra by using a stylus directly on the surface to be tested.
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