TUBULAR BLANK TO OBTAIN FLEXIBLE PARTS Russian patent published in 2018 - IPC B21D9/12 

FIELD: technological processes.

SUBSTANCE: invention relates to the field of metal forming and can be used in the manufacture of bent pipes for boiler building. Tube blank contains the deformable part, which is rigidly connected by the coupling with machining allowances and the part of the technological allowance for setting the blank on the machine and the direction of its movement in the bending process. In this case, the coupling is made in the form of a housing with grooves and sliding blocks, which are fixed in them with locking rings with compression springs installed between them, designed to fix the coupling housing when the deformable part is pulled over and removed after bending. Technological allowance is fixed on the coupling housing with the possibility of multiple use, while the washer is fixed on the coupling housing to prevent the sliding blocks from axially displacing when tightening and removing the deformable part of the tubular blank.

EFFECT: possibility of turning the technological allowance in the process of bending is eliminated.

1 cl, 3 dwg