Method and device for producing a circularly cylindrical body, which consists of plastics material, with internally disposed helical recesses

A device for performing a method,

• said method comprising producing a circularly cylindrical body (10), which consists of a deformable material and which has at least one helical internal recess (12) extending in the interior of the body,
• wherein the body is initially produced with a rectilinear course of the internal recess and wherein the body, which is cut to a specific length, is subsequently subjected to a rolling process, while being supported over its entire length on a support (16), by means of a friction surface arrangement (23), which similarly engages over the entire length of the body, with a friction surface (24) arranged parallel to the support,
• wherein the rolling process is carried out in several steps, wherein in a first step a rolling movement is carried out with use of a first axis (25) of rotation of the friction surface arrangement and in a second step a rolling movement is carried out with use of a second axis (26) of rotation, which is different from the first axis of rotation, of the friction surface arrangement,
• wherein the axes of rotation extend perpendicularly to the support or to the friction surface, and
• said device comprising said support surface (16) for supporting the body (10) over the entire length thereof, said friction surface arrangement (23), which engages the body similarly over the entire length thereof, with said friction surface (24) arranged parallel to the support and a drive unit (27) by which the friction surface arrangement is subjected to a movement producing a rolling process at the body, wherein the friction surface arrangement (23) is rotatable about said first axis (25) of rotation and about said second axis (26) of rotation, wherein the axes of rotation extend perpendicularly to the support or to the friction surface arrangement.