METHOD AND DEVICE FOR PRODUCTION OF CYLINDRICAL HOLLOW PRODUCTS FROM BILLETS Russian patent published in 2009 - IPC B21J5/10 B21J9/04 

FIELD: technological processes.

SUBSTANCE: processed part is opened in core area with the help of serial forging deformations displaced at the angle relative to each other around part axis and simultaneously is placed on piercer. At that in process of forging deformations processed part is pressed to piercer with previously specified force, and piercer is moved towards this axial force, and in intervals between forging deformations following one after another it is returned in initial position synchronously with axial feed of processed part. Method is realised in device that comprises at least two forging tools that are diametrically opposite in relation to processed part, grip head with end support, axial feed and rotary drives. There is also piercer that moves axially with the help of actuator from the side of forging tools, and also working cylinder that serves for support of processed part.

EFFECT: improved quality of piercing.

9 cl, 3 dwg