CLAMPING CHUCK FOR MACHINING OF TUBULAR ROTATING BLANK Russian patent published in 2015 - IPC B23B31/16 B23B31/30 

FIELD: machine building.

SUBSTANCE: chunk is intended for the machine for machining of the pipe blank rotating around the axis of rotation coinciding with middle of the clamp chunk, and includes at least two clamp jaws made for the blank clamping and release, radially moved to the axis of rotation, and located at end face with uniform distribution over perimeter of the chunk end plate, on the jaws the clamp boards are installed. The centring jaws extended from the chunk end plate with forward inclination in the direction of the machined pipe end are provided, they centre the pipe as per middle by means of the clamp cams located on the front free end of the tie-rods of the centring jaws, and that by means of the tooth section of the tie-rod engages with teeth system provided for each centring jaw of the drive, that, in its turn, at the side of the teeth system parallel to side with the teeth system engages with the central tooth-wheel installed concentrically with the axis of rotation; at that this central tooth-wheel synchronises movement of all centring jaws.

EFFECT: improved operation features by means of the external central clamping of the pipe.

16 cl, 8 dwg