METHOD FOR MAKING TUBES WITH SHAPED OUTER ENDS

FIELD: plastic metal working, possibly manufacture and repairing of tube bundles of heat exchange apparatuses. SUBSTANCE: method comprises steps of preliminarily forming calibrated portion by expanding tube end in order to receive its outer diameter exceeding diameter of opening of detachable die in...

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Bibliographische Detailangaben
Hauptverfasser:	KOZIJ S.S, BATRAEV G.A, KOZIJ S.I
Format:	Patent
Sprache:	eng ; rus
Schlagworte:	BLASTING DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OFGENERAL APPLICATION HEAT EXCHANGE IN GENERAL HEATING LIGHTING MECHANICAL ENGINEERING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL PERFORMING OPERATIONS PUNCHING METAL TRANSPORTING WEAPONS WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	FIELD: plastic metal working, possibly manufacture and repairing of tube bundles of heat exchange apparatuses. SUBSTANCE: method comprises steps of preliminarily forming calibrated portion by expanding tube end in order to receive its outer diameter exceeding diameter of opening of detachable die in closed state; realizing two-stage reduction of calibrated portion along length less than its initial length in order to form bearing portion and portion having first step arranged on tube end and second step; fixing tube against possible motion by reducing bearing portion due to applying radial effort to it; expanding tube along first step of bearing portion to diameter equal to that of second step; forming annular protrusion at applying axial compression effort to tube end. EFFECT: lowered deforming efforts. 5 dwg