Method for forming a connecting sleeve having an internal groove

Details Method for forming a connecting sleeve having an internal groove Method for forming a connecting sleeve having an internal groove

1981-12-21

1983-09-27

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Plural sequential shaping or molding steps on same workpiece

264322, 425DIG218, B29D 2300

Patent

active

044068522

ABSTRACT:
A method for forming a connecting sleeve having an internal groove at the end section of a tube made of crystalline or partially crystalline thermoplastic material in which the end section is heated to the deformation temperature and then is axially upset in a heatable device which defines an annular gap until the annular gap is filled. This increases the wall thickness of said end section, which is then shaped to form the connecting sleeve during axial displacement in a mold. The end section is heated to a processing temperature within the range of the deformation temperature and up to the crystalline melting temperature. In the initial step in the heatable device the application of the first axial upsetting force is such that the upsetting begins at the front end of the end section and continues until the annular gap in the heatable device is filled.

REFERENCES:
patent: 3899565 (1975-08-01), de Putter et al.
patent: 4150087 (1979-04-01), de Putter et al.
patent: 4279853 (1981-07-01), Ohta et al.

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