Miedź i stopy miedzi. Odkuwki. PN-EN 12420:2014. wersja angielska (Warszawa : Polski Komitet Normalizacyjny, 2014)
W niniejszej Normie Europejskiej określono skład chemiczny, wymagane własności i tolerancje wymiarów odkuwek matrycowanych i odkuwek swobodnie kutych z miedzi i stopów miedzi. W celu weryfikacji zgodności z wymaganiami niniejszej normy określono również procedury pobierania próbek, metody badań i warunki dostawy.
Foreword 4 Introduction 6 1 Scope 7 2 Normative references 7 3 Terms and definitions. 7 4 Designations 8 4.1 Material 8 4.1.1 General 8 4.1.2 Symbol 8 4.1.3 Number 8 4.2 Material condition 8 4.3 Product 8 5 Ordering information 10 6 Requirements. 10 6.1 Composition 10 6.2 Mechanical properties 11 6.2.1 Hardness properties 11 6.2.2 Tensile properties 11 6.3 Electrical properties 11 6.4 Resistance to dezincification 11 6.5 Residual stress level 11 6.6 Tolerances for die forgings 11 6.6.1 General 11 6.6.2 Tolerances for dimensions within the die cavity and for dimensions across the die parting line 12 6.6.3 Mismatch 13 6.6.4 Flash projection 14 6.6.5 Ejector marks 15 6.6.6 Flatness tolerances 15 6.6.7 Angular tolerances 16 6.7 Tolerances for cored forgings 16 6.8 Tolerances for hand forgings 17 6.8.1 General 17 6.8.2 Tolerances on dimensions 18 6.8.3 Flatness tolerance 18 6.9 Surface quality 19 6.10 Drawings 19 7 Sampling 19 7.1 General 19 7.2 Analysis 19 7.3 Hardness, stress corrosion resistance, dezincification resistance and electrical property tests 20 8 Test methods. 20 8.1 Analysis 20 8.2 Hardness test 20 8.3 Electrical conductivity test 20 8.4 Dezincification resistance test 20 8.5 Stress corrosion resistance test 20 8.6 Retests 21 8.6.1 Analysis, hardness, electrical conductivity and dezincification resistance tests 21 8.6.2 Stress corrosion resistance test 21 8.7 Rounding of results 21 9 Declaration of conformity and inspection documentation 21 9.1 Declaration of conformity. 21 9.2 Inspection documentation 21 10 Marking, labelling, packaging 22 Annex A (informative) Recommended guidelines for design 39 A.1 Introduction 39 A.2 General information 39 A.3 Guidelines for die forgings .40 A.3.1 Drafts 40 A.3.2 Web thicknesses 40 A.3.3 Side wall thicknesses 41 A.3.4 Rib design 42 A.3.5 Cores 43 A.3.6 Flash A.3.7 Transition radii .45 A.3.8 Clamping lengths and clamping areas for finish machining 47 A.3.9 Design for cross-sectional shapes 47 A.3.10 Recommended machining allowances and total allowances 48 A.4 Guidelines for hand forgings 50 A.4.1 General 50 A.4.2 General information 50 A.4.3 Section changes and transitions 51 A.4.4 Recommended machining allowances 51 A.4.5 Total allowances per side of forging 52 A.5 Guidelines for marking 52 Annex B (informative) Tensile properties 54 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC, Pressure Equipment Directive (PED) 58 Bibliography 59
Norma w jęz. ang.
Zastępuje PN-EN 12420:2002.wersja polska
Wprowadza EN 12420:2014 - IDT
Legislacja 2014/68/EU
Keywords: metale; wyroby metalowe; Normy