PRESS2010_EN

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3pZ1vZ4vZ1p4ZpZ5vZ3vZ5pZ2pZ2vZzRvZpZaRーExcerpt from JIS B 0031（1994）ーJIS B 0122（1978）GGLGHLDDRRTM（appendix 1）A section of standard length （ℓr） is sampled from the mean line on the roughness chart. The value is obtained with the area between the peaks and valleys divide by the standard length （ℓr）.Surface roughnessJIS standards of surface roughness have been revised a lot based on ISO changes in 2001.The main content of JIS’（JIS B 0601−2001）revised part is as follows.1Alter old JIS’（JIS B 0601−1994）maximum height, Ry to maximum RZ（Table 1※1）.2Delete the old JIS’ ten-spot average roughness RZ from the standard, according to the new JIS addenda, it is defined as Rzjis（Table 1※2）different from JIS Rz.3Profile curves for articulating eigenvalue are cross-section curve, roughness curve, expansion curve, which are defined respectively as cross-section curve eigenvalue（the initial P）,roughness curve eigenvalue（the initial value R）, expansion curve eigenvalue（the initial W）About surface roughnessConversion between old machining symbol and new JIS roughness Standard seriesStandard lengthEvaluation lengthRaℓrℓn【μm】 0.012 0.025 0.05 0.1 0.2 0.4 0.8 1.6 3.2 6.312.52550【mm】0.08【mm】0.4PeakSymmetricalSymmetricalTroughAverage lineStandard length（ℓｒ）Standard lengthStandard seriesℓrℓnRz【mm】【mm】【μm】 0.05 0.1 0.2 0.4 0.8 1.6 3.2 6.3 12.5 25 50100200Average linePeakStandard length（ℓｒ）Standard seriesStandard lengthEvaluation lengthRzJIS【mm】【mm】【μm】 0.05 0.1 0.2 0.4 0.8 1.6 3.2 6.3 12.5 25 50100200With or without material processingWithout processingSymbols of processing method are excerpted from（JIS B 0122−1978）Processing methodSymbolProcessing methodSymbolGrindingTurningLappingDrillingHoningReamingElectric discharge machiningSPEDThreadingMillingPolishing（manually）FLTroughExamples of graphic methodIn order to meet the international standards of graphic method, JIS B 0031−2003 is revised to a great extent. But the old processing symbols or old JIS（JIS B 0031−1994）symbols can be normally used too. Here the introduction of the old JIS graphic method is given.Ra valueSymbols of （surface roughness）processing methodWith processingPeakAverage lineTroughStandard length1128Table 1　comparison of surface roughness between new and old JIS standardsOld JIS standardsJIS 0601−1994Ra＝Part area÷standard lengthℓr0.251.250.812.52.540EigenvalueArithmetic average heightStandardseriesNew JIS standardsJIS 0601−2001Cross-section curve eigenvaluePaArithmetic mean roughness：RaArithmetic mean roughnessRaOldmachiningSymbolRoughness curve eigenvalueExpansion curve eigenvalueRaWaRaMaximum peak：Rz（old JIS standard：Ry）Ten-spot average roughness：RzJIS （old JIS standard：Rz）A section of standard length is sampled from A section of standard length is sampled from the mean line on the roughness chart. The the mean line on the roughness chart. The distance between the peaks and valleys distance between the peaks and valleys of the sampled line is measured in the z of the sampled line is measured in the z direction. direction.Maximum peakRz（old JIS standard：Ry）Evaluation length−−−−−−〜4848ba48Rz＝Zp＋Zv0.080.40.251.250.82.512.540Ten-spot average roughnessRZJIS（old JIS：Rz）Max. heightRoughness curve Cross-section curve eigenvalueeigenvaluePzRz※1RyRzJIS＝Zp1〜5 Average＋Zv1〜5 Average0.080.40.251.250.82.512.540Ten-spot average Expansion curve eigenvalueroughnessRzJIS※2WzRzSurface Roughness and Expressing MethodsJIS B 0601（2001）