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WUXI SHARP-EYED HARDWARE PARTS CO.,LTD
Address:108 Xi-xian Rd.,Meicun,Wuxi New District Jiangsu,China 214112
Contact: Mr. Zhong 15986679828
Tel：0510-88158986
Fax：0510-88158965
Web:www.sharp-eyed.com.cn
E-mail:sales@sharpeye.com.cn |
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| TECHNICAL DOCS |
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| Surface roughness and machining symbols | | admin：admin issue：2013/5/4 9:21:20 cake：2427 | 1.Type of surface roughness
The surface roughness of industrial products of the parameters are defined as detailed below: arithmetic mean roughness (Ra), maximum height (Ry), ten-point average roughness (Rz), the average interval between irregularities (sm), the local average peak interval (s), and the load length ratio (tp). The surface roughness of the surface of the object obtained from the arithmetic mean of the random access. [Centerline average roughness (Ra75) See the definition of JIs B 0031 and the attachment of the JIs B 0601]
Representation method for finding surface roughness
Arithmetic average roughness Ra
From the average roughness curve circle line direction sampling period of standard length. Sample line from the top line and bottom line in bold curves between rates measured in the direction several times. Their units to millimeters (μm) calculation.
Remarks calculate Ry value, the sampling standard length, should avoid taking the top and bottom of scratches and other high or low part.
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Maximum height Ry
From the average roughness curve round a standard length of sampling line direction, from a sample of this segment of the line between the top line and the bottom curve in crude rate measured in the direction several times. Their units to millimeters (μm) calculation.
Remarks calculate Ry value, the sampling standard length, should avoid taking the top and bottom of scratches and other high or low part.
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Ten-point average roughness Rz
From the roughness curve circle average standard length direction sampling period, the sample line several times the average rate of the direction lines to determine, find the highest peak to the fifth summit elevation (Yp) and the mean absolute lowest low to 5 bottom elevation (Yv) and the mean absolute value, in units to millimeters (μm) calculation. |
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Yp1、Yp2、Yp3、Yp4、Yp5:The standard sample length L, the highest peak to the elevation of the top five
Yp1、Yp2、Yp3、Yp4、Yp5:The standard sample length L, the minimum Peak to Peak's elevation 5 |
Reference arithmetic average roughness (Ra) and the relationship between traditional processing symbols
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arithmetic average roughness
Ra
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maximum height Ry
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ten-point average roughness Rz
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Ry · Rz reference length L (mm)
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conventional machining symbols
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| Standard Series
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judgment value μm (mm)
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surface roughness circled
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Standard Series
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0.012a
0.025a
0.05 a
0.1 a
0.2 a
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0.08
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0.05 s
0.1 s
0.2 s
0.4 s
0.8 s
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0.05 z
0.1 z
0.2 z
0.4 z
0.8 z
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0.08
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▽▽▽▽
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0.25
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0.25
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0.8
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0.8
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0.4 a
0.8 a
1.6 a
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1.6 s
3.2 s
6.3 s
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1.6 z
3.2 z
6.3 z
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▽▽▽
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3.2 a
6.3 a
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2.5
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12.5 s
25 s
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12.5 z
25 z
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2.5
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▽▽
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12.5 a
25 a
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50 s
100 s
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50 s
100 s
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▽
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8
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8
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50 a
100 a
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200 z
400 z
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200 z
400 z
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～
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-
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-
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