Apparatus for forming bellings on thermoplastic pipes

摘要

A tool for automatically forming on thermoplastic pipes, bellings of considerable longitudinal extension for sealingly joining pipes subject to high stresses. The tool includes a shaped spindle on which there is axially inserted a heated end of the thermoplastic pipe, and a first and second mechanical body that receives pressurized fluids which act on the pipe. The heated pipe end is plastically deformed in the region of the shaped portion of the spindle to form an annular seat and bell portion of the belling.