Worm-gear element for worm-gear machines

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 47/60 (2006.01)

Patent

CA 2229566

The worm-gear element proposed is intended for use in worm-gear machines, in particular in twin-shaft worm-gear machines for use in the plastification of thermoplastics. The worm-gear element has a core (1) and e.g. helical lands (2). The core (1) consists at least in part of a material (3) which is softer than the surrounding material (4) of the lands (2). The worm-gear element is produced at least in part from a powder-form starting material by hot isostatic pressing. The core material (3) has an external diameter (7) which is at least as great as the internal diameter (6) of the lands.

L'élément à vis sans fin est destiné à être utilisé dans des machines à vis, en particulier, des machines à vis à arbres jumelés pour la plastification de matières thermoplastiques. L'élément à vis sans fin présente un noyau de vis (1) et des crêtes de vis, par exemple, hélicoïdales (2). Le noyau de vis (1) est constitué, au moins partiellement, par un matériau formant l'âme (3), qui est un matériau plus mou que le matériau de l'enveloppe (4) des crêtes de vis (2). L'élément à vis sans fin est fabriqué, au moins en partie, à partir d'un matériau de base en poudre, par pressage thermo-isostatique. Le matériau de l'âme (3) présente un diamètre extérieur (7) qui est au moins aussi grand qu'un diamètre intérieur (6) des crêtes de vis.

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