Abstract: In a method for the production of a treatment element for a screw machine, a treatment element core of a first metal material is arranged in an inner space of a capsule of a hot isostatic pressing installation so that a contoured annular space is formed between a capsule wall and a treatment element core. The annular space is filled with a powder of a second metal material so as to produce an anti-wear layer. Afterwards, the treatment element blank is produced in such a way that the materials are combined by hot isostatic pressing to form a composite body. The treatment element blank is then post-processed to form the treatment element. The method according to the invention simplifies the production of treatment elements by in particular simplifying post machining and/or heat treatment of the anti-wear layer thus produced.

Abstract: A screw-type extruding machine includes a housing; a driveable shaft disposed inside the housing and including a rotational moment transfer element; and at least one screw element. The screw element has two ends and defines a longitudinal groove therein for receiving the rotational moment transfer element of the shaft, the shaft thereby transferring its rotational moment to the screw element. The groove is configured such that it defines two expansion regions, each expansion region having an axial extent, the groove having side surfaces which diverge with respect to a longitudinal axis of the groove along the axial extent of each expansion region in a direction toward a corresponding one of the two ends of the screw elements, a width of the groove thereby increasing in a direction toward its two ends along each expansion region.