Техническая информация Sumitomo - страница 31

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■ Finished Surface Roughness

●Types and Definitions of Typical Surface Roughness●Relationshipwith Triangular Symbols
Types ghtSymbolMethod of Determination This is the value expressed in micrometers (μm), obtained by extracting from the roughness curve a segment of the reference length in the direction of the mean line and measuring theDescriptive FigureDesignated Values for 1) RzDesignated Values for RaDesignated Values for 2) RzJISStandard Reference Length Values, (mm)Triangular Symbols
m Hei1) Rzdistance from the d eepest valley to the highest peak of the extracted segment in the direction of the longitudinal magnification of that roughnessRp Rz Rv m(0.05) 0.1(0.012) 0.025(0.05) 0.1
mucurve.L0.20.050.2025JJJJ
MaxiRemarks: When obtaining Rz, care must be taken to extract a segment of the referenceRz=Rp+Rv0.40.100.4.
length from a portion having no unusually high peaks and deep valleys0.80.200.8
as theyare considered as flaws.
This is the value exressed in1.60.401.6
essp micrometers (μm), obtained by3.20.803.20.8JJJ
ghnextracting from the roughness curve a segment of them6.31.66.3
ted RouRareference length in the direction of the mean line, plotting a roughness curve of y = f(x) withL Ra12.5 (18)3.212.5 (18)2.5JJ
lculathe X-axis set in the direction and the Y-axis set in the directionL L Ra=��ʃ�������� 1 0256.325
Caof the extracted segment, and using the following formula.(35)(35)
5012.550
essThis is the value expressed in micrometers (μm), obtained by(70)25(70)8J
ghnextracting from the roughness curve a segment of the reference length100100
Rouin the direction of the mean line, measurin the heihts of the hihest toYp1 Yp2 Yp3 Yp4 Yp5 v1 Yv2 Yv3 v4 v5 m(140)(140)
an2) RzJISg g g 5th highest peaks (Yp) as well as theL Y Y Y20050200
Meheights of the deepest to 5th deepest(280)()(280)——
intvalleys (Yv) in the direction of the longitudinal magnification of that mean(Yp1+Yp2+Yp3+Yp4+Yp5)+(Yv1+Yv2+Yv3+Yv4+Yv5) 5 RzJIS=400(100)400
-poline of the that roughness curve, and(560)(560)
encalculating the sum of the mean of the
Tabsolute values of Ypand that of Yv.Remarks: Thedesignated values in the brackets do not applyunless
Design values iated val and the iues of the above types of surface ro triangular symbol classifi cations areughness, standard reference length i shown on the table on the right.othe Due to the re and wavy (~)rwise stated. vision of JIS in symbols, were1994, the finishi abolished.ng symbols, triangular ( J )

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