Production of a cylindrical housing for a double screw extruder

Details Production of a cylindrical housing for a double screw extruder Production of a cylindrical housing for a double screw extruder

2005-04-19

2005-04-19

Van, Quang T. (Department: 3742)

Electric heating

Inductive heating

Specific heating application

C219S644000, C148S198000, C464S124000

Reexamination Certificate

active

06881934

ABSTRACT:
A process for producing a barrel for a twin-screw extruder with intermeshing screws from a steel block, wherein the barrel has a wear resistant inner surface, includes producing two partially intersecting bores passing completely through the steel block, the two intersecting bores forming a spectacle-shaped bore having narrowed regions where the two intersecting bores intersect, and hardening an inner surface of the spectacle-shaped bore with essentially constant depth of penetration by passing an inductor through the spectacle-shaped bore from one end to the other, the inductor is smaller than but having approximately the same shape as the inner contour of the spectacle-shaped bore and is configured such that less energy for heating the inner surface of the spectacle-shaped bore is delivered in the vicinity of the two narrowed regions of the spectacle-shaped bore by the longitudinal sections on the periphery of the inductor than in regions on the inner contour remote from the narrowed regions.

REFERENCES:
patent: 4375997 (1983-03-01), Matz
patent: 4401485 (1983-08-01), Novorsky
patent: 4689035 (1987-08-01), Orain
patent: 5304000 (1994-04-01), Kowalczyk et al.

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