FABBRICAZIONE DI TUBI A PIU'PROCEDIEMTNO E IMPIANTO PER LASTRATI

According to a known method for manufacturing such pipes which are used particularly as brake lines in motor vehicles, a steel strip provided with a copper coating is wound transversally and in a continuous manner so as to obtain an endless multilayer pipe which is then submitted to a heat treatment...

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Bibliographische Detailangaben
Hauptverfasser:	DIETZEL HANS-ULRICH, MUFFKE WALTER
Format:	Patent
Sprache:	ita
Schlagworte:	AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING MACHINE TOOLS MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS PUNCHING METAL SOLDERING OR UNSOLDERING TRANSPORTING WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	According to a known method for manufacturing such pipes which are used particularly as brake lines in motor vehicles, a steel strip provided with a copper coating is wound transversally and in a continuous manner so as to obtain an endless multilayer pipe which is then submitted to a heat treatment. According to this continuous heat treatment, the cold pipe is brought and kept at 1370`K. The copper coating melts and the different layers of the pipe are welded together. The quality of the pipe then obtained depends on several conditions which are difficult to satisfy; for example, this method requires a high mastery of the technic of production, perfectly adjusted machines and a steel strip with small thickness tolerances so as to avoid considerable manufacturing difficulties. In order to avoid too much production waste, the heat treatment of the multilayer pipe is carried out in two steps. Immediately after the formation of the pipe and combined with the first heating step, a final annealing temperature of 1200`K in order to eliminate the stress and to obtain the welding during the second heating step.