A method and a machine for forming an end portion of a plastic pipe.

摘要

In a method for forming an end portion (2) of a plastic pipe (1) the end portion (2) is transferred to softened state and the end portion (2) is provided with an internal groove by axially displacing the pipe end portion (2) in relation to a mould ring (21) which is thereby introduced into the pipe end portion (2). After the forming of the pipe end portion (2) the mould ring (21) is left in the pipe end portion (2) for forming a sealing ring therein. During the forming operation the pipe end portion (2) is supported on a mandrel (10). In accordance with the invention the mould ring (21) is displaced into the pipe end portion (2) by displacing the ring along the mandrel (10) while the pipe end portion (2) is in its softened condition supported by the mandrel (10) substantially without being displaced along the mandrel (10). The invention also comprises a machine for forming an end portion (2) of a pipe according to the method of the invention.