TUBE END EXPANDING METHOD Russian patent published in 1998 - IPC

Abstract RU 2122912 C1

FIELD: plastic metal working, namely, forming parts of tubular blanks, possibly in aircraft manufacture, ship building and allied industry branches. SUBSTANCE: method comprises steps of placing inside tubular blank before its contact with punch additional tubular blank with outer diameter equal to inner diameter of main tubular blank and made of metal providing small friction factor. EFFECT: enhanced quality of tube expanded portions, increased shaping degree. 1 dwg

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RU 2 122 912 C1

Authors

Mar'In B.N.

Makarov K.A.

Ivanov Ju.L.

Odinokov V.I.

Makarova E.A.

Dates

1998-12-10—Published

1997-08-13—Filed