Pipe bending mandrel

摘要: A method and means for bending pipe other hollow bodies into arcuate shape while restraining collapsing tendencies of the walls by supporting internally on a close-fitting, crush-resistant flexible arbor, expanding arbor size applying pressurized fluid within an annular deformable chamber or tubing wound helically about periphery arbor. When thermo-plastic which previously has been heated to above deformation temperature in areas be deformed, circulating also serves as heat exchanger, hastening cooling process.