发明名称 |
METHOD FOR MAKING TUBES WITH SHAPED OUTER ENDS |
摘要 |
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 |
申请公布号 |
RU2198052(C2) |
申请公布日期 |
2003.02.10 |
申请号 |
RU20010100447 |
申请日期 |
2001.01.05 |
申请人 |
SAMARSKIJ GOSUDARSTVENNYJ AEHROKOSMICHESKIJ UNIVER;OBSHCHESTVO S OGRANICHENNOJ OTVETSTVENNOST'JU "REM |
发明人 |
BATRAEV G.A.;KOZIJ S.I.;KOZIJ S.S. |
分类号 |
B21D53/08;B21D41/00;F28F1/00 |
主分类号 |
B21D53/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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