Техническая информация Sumitomo - страница 31

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References ■ Finished Surface Roughness ● Types and Definitions of Typical Surface Roughness ● Relationship with Triangular Symbols Types Symbol Method of Determination Descriptive Figure Designated Designated Designated Standard Triangular* This is the value expressed in micrometers Values for Values for Values for Reference (μm), obtained by extracting from the roughness *1) Ra *2) Length Values, Symbols Height curve a segment of the reference length in the Rz RzJIS (mm) direction of the mean line and measuring the distance from the d eepest valley to the highest m (0.05) (0.012) (0.05) peak of the extracted segment in the direction of Rp Rz Maximum *1) the longitudinal magnification of that roughness 0.1 0.025 0.1 Rz Rv curve. L 0.2 0.05 0.2 0.25 JJJJ Remarks: When obtaining Rz, care must be taken Rz = Rp + Rv 0.4 0.10 0.4 to extract a segment of the reference length from a portion having no unusually high peaks and deep valleys 0.8 0.20 0.8 as they are considered as flaws. This is the value expressed in 1.6 0.40 1.6 Roughness micrometers (μm), obtained by 3.2 0.80 3.2 0.8 JJJ extracting from the roughness m 6.3 1.6 6.3 curve a segment of the Ra reference length in the direction 12.5 12.5 Calculated Ra of the mean line, plotting a 3.2 roughness curve of y = f(x) with L (18) 6.3 (18) 2.5 JJ the X-axis set in the direction ʃ Ra=ࠈ1 L 25 25 and the Y-axis set in the direction L 㹰I[㹲G[ of the extracted segment, and 0 using the following formula. (35) (35) This is the value expressed in 50 12.5 50 8 J Mean Roughness micrometers (μm), obtained by (70) 25 (70) extracting from the roughness curve 100 100 a segment of the reference length Yp1 Yp3 Yp4 Yp5 m in the direction of the mean line, Yp2 (140) (140) measuring the heights of the highest to Yv1 Yv2 Yv3 Yv4 Yv5 *2) 5th highest peaks (Yp) as well as the 200 200 RzJIS heights of the deepest to 5th deepest L (280) (50) (280) — — Ten-point valleys (Yv) in the direction of the RzJIS= (Yp1+Yp2+Yp3+Yp4+Yp5)+(Yv1+Yv2+Yv3+Yv4+Yv5) 400 (100) 400 longitudinal magnification of that mean 5 line of the that roughness curve, and (560) (560) calculating the sum of the mean of the absolute values of Yp and that of Yv. Remarks: The designated values in the brackets do not apply unless Designated values of the above types of surface roughness, standard reference length otherwise stated. values and the triangular symbol classifications are shown on the table on the right. * Due to the revision of JIS in 1994, the finishing symbols, triangular ( J ) and wavy (~) symbols, were abolished. N References Technical Guidance / N39