Screw for machines for processing plastic

Details Screw for machines for processing plastic Screw for machines for processing plastic

B - Operations, Transporting

29

C

B29C 47/60 (2006.01) C23C 4/02 (2006.01) C23C 4/08 (2006.01) C23C 28/02 (2006.01)

Patent

CA 2389855

A screw for plastic-processing machines consists of the base material of a screw that can no longer be used due to wear, and a wear-reducing coating consisting of molybdenum or an alloy containing molybdenum which is applied to the crest track of the screw flight and regenerates said screw. A single or multiple layer buffer layer consisting of a magnetically conductive metallic material is provided between the base material and the coating. This provides a simple means of ensuring that the regenerated screw has a long service life and is resistant to heavy loads. Said buffer layer is applied to the base material and the wear-reducing coating is applied to the buffer layer by means of a thermal spraying method, respectively.

L'invention concerne une vis de machine de transformation des plastiques. Cette vis est constituée d'un matériau de base d'une vis devenue inutilisable par usure et d'un revêtement de molybdène ou autre alliage contenant du molybdène, qui est appliquée sur la bande en saillie du segment vis et qui réduit l'usure et régénère la vis. Pour garantir par des moyens simples, dans le cas d'une vis régénérée, une longue durée de service pour une charge admissible élevée, on dispose une couche tampon monocouche ou multicouche réalisée dans un matériau métallique magnétiquement conducteur entre le matériau de base et le revêtement, la couche tampon étant appliquée sur le matériau de base et le revêtement réduisant l'usure étant appliqué sur la couche tampon respectivement par un procédé de thermo-injection.

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