Document Type and Number:
Japanese Patent JPS5244913
Kind Code:
B2
Abstract:
In order to provide the end of a pipe of thermoplastic material with a connecting sleeve presenting an outwardly projecting annular bulge, the pipe end is heated to the deformation temperature of the plastic material, is then introduced into the annular gap formed between a sleeve mandrel and an outer mold formed to have an annular recess presenting a free bulge space in a widening and compressing device, the surface of the mandrel being formed to have a constriction opposite the annular recess in the mold, the pipe end is widened in the sleeve region by the mandrel and is simultaneously compressed in the axial direction until it fills the annular gap, then the axial advancing force required to push the heated pipe end and to compressively deform it is increased while there is simultaneously applied a supporting pressure to the pipe in the region of the free bulge space and in the direction from the sleeve mandrel toward the outside until the pipe wall material, under the influence of the advancing force and the supporting pressure, bulges into the free bulge space, and finally, while maintaining the increased advancing force, the supporting pressure in the region of the free bulge space is increased to a compression pressure value which presses the bulged pipe wall material against the peripheral outline of the recess in the outer mold.
Application Number:
JP13499975A
Publication Date:
November 11, 1977
Filing Date:
November 10, 1975
Export Citation:
International Classes:
F16L21/00; B29C45/00; B29C57/00; B29C57/02; B29C57/04; B29C57/08