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Surface Roughness (JIS B 0601-2001)
Theoretical (Geometrical) Surface Roughness f
R
Theoretical Surface Roughness at Turning indicates the minimum
roughness value from the cutting conditions and it is shown by the
formula as follows:
Rz(h) f2 103 Rz(h)
8R(r)
Rz(h) Theoretical Surface Roughness m
Feed Rate mm/rev
(r) Corner Radius of Insert mm
How to Obtain Surface Roughness Values Relationship with Triangle Symbol
Type Symbol How to Obtain Explanation Arithmetical Max. Height Ten PointsMean Note:
Mean Roughness Roughness Roughness (Relationship
Ry is obtained from the distance in micron m
meter between the highest peak and the Ra(m) Rz(m) RzJIS(m) with Triangle)
lowest valley in the range of sampled
Max. Height reference length () to the direction of mean Rp 0.025 0.1 0.1
Roughness line of the roughness curve. Ry 0.05 0.2 0.2
Rv 0.1 0.4 0.4
Rz 0.2 0.8 0.8
Rz Rp Rv 0.4 1.6 1.6
0.8 3.2 3.2
Rz is obtained from the total in micron meter 1.6 6.3 6.3
of the mean value of the each distance
between the mean line and 5 peaks (Yp) Yp1 m 3.2 12.5 12.5
from the highest one, and the mean value of Yv1 6.3 25 25
the each distance between the mean line
and the 5 valleys (Yv) from the lowest one, Yp2 12.5 50 50
of the roughness curve in the range of Yv2 25 100 100
sampled reference length “”.
Yp3
Yv3
Yp4
Yv4
Yv5
Yv5
Ten Points Mean RzJIS Yp1,Yp2,Yp3,Yp4,Yp5: Note: Finishing symbol (Triangle and wave~) was
Roughness Distance from the mean line to highest 5 abolished from JIS standard from 1994 Revision.
peaks in the range of sampled reference
length “” How to Indicate
Yv1,Yv2,Yv3,Yv4,Yv5:
RzJIS Yp1 Yp2 Yp3 Yp4 Yp5 Yv1 Yv2 Yv3 Yv4 Yv5 Distance from the mean line to the lowest 5 Example
valleys in the range of sampled reference When Ra is 1.6m1.6mRa
5 length “” When Rz is 6.3m6.3mRz
When RzJIS is 6.3m6.3mRzJIS
Arithmetical Mean Ra is obtained from the following formula in Y
Roughness micron meter when the roughness curve is m
expressed by y=f(x), taking X-axis to the mean
line direction and Y-axis to the vertical Ra
Ra magnification of the roughness curve in the X
range of sampled reference length “”.
Ra1
f(x) dx
0
Indication in JIS Standard
Example of Ra Indication 6.3 Example of Ry, (Rz) Indication Rz6.3
When indicating the upper limit only When indicating upper limit onlyIndicate
(when upper limit is 6.3mRa) surface roughness following the parameter
symbol.
R
When indicating both lower and upper limit 6.3 When indicating both lower and upper limit Rz6.3~1.6
(when upper limit is 6.3mRa, lower limit is 1.6mRa) 1.6 Indicate surface roughness as (upper limit ~
lower limit) following the parameter symbol.
Technical
Note: The indications of Ra and Rz are different. Information
Surface Roughness Symbol Caution Type Symbol of Symbol of
JIS B 0601-1994 JIS B 0601-2001
The above information is based on JIS B 0601-2001. Max. Height
However, some symbols were revised as shown in the right table in Roughness Ry Rz
accordance with ISO Standard from JIS B 0601-2001 version. Ten Points Rz RzJIS
Ten Points Mean Roughness (Rz) was eliminated from 2001 version Mean Roughness Ra Ra
but it still remains as RzJIS reference, since it was popular in Japan. Arithmetical Mean
Roughness
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