DEVICE FOR FORMING A CIRCUMFERENTIAL GROOVE ON A PIPE Russian patent published in 2022 - IPC B21D17/04 

FIELD: circumferential groove forming.

SUBSTANCE: claimed device for forming a circumferential groove on a tubular element. The device contains: a gear, fixed without the possibility of rotation around the axis of the gear, located coaxially with the said gear; an expandable matrix located close to said gear and concentrically with said gear axis, said expandable matrix having a plurality of matrix segments configured to move radially towards and away from said gear axis, wherein each said segment of the matrix has a surface of the matrix facing away from the said axis of the gear and configured to interact with the inner surface of the said tubular element when moving away from it; a drive device coupled to said expandable die for moving said die segments to and from said gear axis; a carrier surrounding said expandable matrix, said carrier being rotatable about said gear axis, said carrier defining an opening aligned with said gear axis for receiving said tubular member; a set of gear wheels mounted on the said carrier, wherein each said gear wheel is rotatable relative to said carrier about a corresponding gear wheel axis, each said gear wheel being in engagement with said gear wheel; a plurality of cam bodies, each said cam body being mounted on a corresponding one of said gears; a plurality of first cam surfaces, each of said first cam surfaces extending around a corresponding one of said cam bodies, each of said first cam surfaces comprising a region of increasing radius and discontinuity; wherein said tubular member is disposed between said die surfaces and said first cam surfaces when said tubular member is inserted into said opening.

EFFECT: creation of a device for forming a circumferential groove on a tubular element.

61 cl, 19 dwg