FIELD: technological processes.
SUBSTANCE: tube stock is filled with liquid filler, which consists of water and emulsol mixed with it, and is bent in tube bending devices. After bending tube stock with the filler is placed into split rigid mould, where pass geometrical parameters fit final stock shape. Then they are cooled down to negative temperature, when volume expansion of ice created in the filler stimulates pressure tensions in stock walls that are higher than stock material yield point. Then the stock is annealed for removal of residual stress.
EFFECT: efficiency increases.
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD FOR PRODUCING BENT TUBULAR BLANKS | 2006 |
|
RU2308341C1 |
| THIN-WALL PIPE BENDING METHOD AND RELATED DEVICE | 2007 |
|
RU2354478C1 |
| METHOD FOR MAKING SHARPLY BENT BRANCH PIPES | 2003 |
|
RU2241561C1 |
| BENDING METHOD OF THIN-WALLED PIPES | 2006 |
|
RU2349406C2 |
| METHOD FOR BENDING THIN-WALL PIPES WITH FILLER | 2006 |
|
RU2337779C2 |
| HYDRAULIC PRESS FOR SHAPING SHARPLY BENT BRANCH PIPES | 1998 |
|
RU2172221C2 |
| METHOD OF MAKING SHARPLY BENT BRANCH PIPES BY BENDING | 1994 |
|
RU2094151C1 |
| METHOD OF RING BLANKS PRODUCTION BY BENDING OF STEEL PIPES | 2012 |
|
RU2516139C2 |
| METHOD OF FORMING RETURN BENDS | 2012 |
|
RU2506134C1 |
| BENDING METHOD OF LONG HOLLOW ARTICLES WITH OPEN TYPE PROFILE | 2018 |
|
RU2691478C1 |
