METHOD FOR MAKING HEAT EXCHANGE TUBES WITH PROFILED ENDS

FIELD: plastic metal working, namely processes for making heat exchange tubes with profiled outer end portions. SUBSTANCE: method comprises steps of expanding end of tube; forming calibrated portion and reducing it along length less than initial one in order to make transition cone portion; placing...

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Bibliographic Details
Main Authors KOZIJ S.S, KOCHETKOVA N.V, BATRAEV G.A, PROTSKAJA L.V, TARASOVA T.M, KOZIJ S.I
Format Patent
LanguageEnglish
Russian
Published 20.04.2003
Edition7
Subjects
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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Summary:FIELD: plastic metal working, namely processes for making heat exchange tubes with profiled outer end portions. SUBSTANCE: method comprises steps of expanding end of tube; forming calibrated portion and reducing it along length less than initial one in order to make transition cone portion; placing end portion of tube into detachable die in such a way that cone transition portion is arranged in front of annular recess of die; fixing tube against its possible motion by bending calibrated portion of tube in radial direction by means of die protrusion at introducing material of transition cone portion in annular recess of die; then forming annular outer protrusion on tube by applying to its end axial compression effort for providing plastic yielding of tube material to annular recess of die. EFFECT: lowered tube deforming efforts. 5 dwg
Bibliography:Application Number: RU20010116760