Blind fastener and manufacturing method therefor

The method for the heat treatment of a blind fastener (1) having a hollow sleeve (3) includes austempering. Austempering includes a step in which the hollow sleeve (3) of cold-rolled low carbon steel with a carbon percentage of 0.08 to 0.13% is heated and maintained from 800°C to 950°C during carbur...

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Bibliographische Detailangaben
1. Verfasser:	Makino, Takanori
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS ORMACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS,CLIPS, WEDGES, JOINTS OR JOINTING DIFFUSION TREATMENT OF METALLIC MATERIAL ENGINEERING ELEMENTS AND UNITS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIGHTING MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL ENGINEERING METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	The method for the heat treatment of a blind fastener (1) having a hollow sleeve (3) includes austempering. Austempering includes a step in which the hollow sleeve (3) of cold-rolled low carbon steel with a carbon percentage of 0.08 to 0.13% is heated and maintained from 800°C to 950°C during carburization, and a subsequent step in which isothermal maintenance is performed from 320°C to 500°C. The resulting carbon percentage (CP) value is from 0.3 to 0.5%. Even in the case of a low carbon steel blind fastener, austempering can harden the surface of the sleeve and soften the inner portion other than the surface for suitable deformability in order to provide a blind fastener having a sleeve with high surface hardness and sufficient elongation.