DIN EN 3278:2019 pdf free.Luft- und Raumfahrt -Hilsen, iberstehender Kopf, aus korrosionsbestandigem Stahl (Wanddicke 0,25 mm); Deutsche und Englische Fassung FprEN 3278:2018.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
– IEC Electropedia: available at http:/ /www .electropedia.org/ – ISO Online browsing platform: available at http://www.iso.org/obp
3.1 crack rupture in the material which may extend in any direction and which may be intercrystalline or transcrystalline in character
3.2 seam open surface defect which is the result of the extrusion of the material
3.3 lap surface defect caused by folding over metal fins or sharp corners and then rolling or forging them into the surface
4 Required characteristics
4.1 Configuration – Dimensions 一Tolerances The configuration shall be in accordance with Figure 1; the dimensions and tolerances shall conform to the values shown in Figure 1 and in Table 1 and Table 2 after surface treatment.
4.2 Surface roughness See Figure 1. The values apply prior to application of aluminium pigmented coating respectively after passivation.
4.3 Material Steel EN 2175, received in the annealed condition and cold worked during manufacture.
4.4 Surface treatment None: Passivation per EN 2516. Code“Z”: aluminium pigmented coating per EN 4473 type I or type II. . Code“”ZG”: aluminium pigmented coating per EN 4473 type II or type IV. Annotation: Coating required on sleeve outer surface only, coating on inner surface depends on manufacturer’s option.
4.5 Form code See Figure 1 and Table 1. Values in micrometres apply prior to surface treatment.
6 Marking EN 2424, style G. In addition, the quantity shall be stated on the package.
7 Technical requirements
7.1 Manufacture The sleeve shall be formed by a drawing process from sheet or strip stock to form a one piece tubular section and head.
7.2 Surface appearance The sleeves shall be free from cracks, seams and laps. Under visual examination, the sleeve may show axial flow lines in the tubular section typical of a drawn sleeve. The flow lines shall be continuous at the fillet radius. A slight visible orange peel effect is also permissible.
7.3 Sampling In conformity with ISO 2859, using normal or reduced inspection methods. The acceptable quality level(AQL) is 1 %.DIN EN 3278 pdf download.