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