Screw elements and method for manufacturing screw elements

Abstract

A production method for screw elements (1) with a screw body (3) with an axially through-opening (5) with internal gearing (7) for mounting on a support shaft and an outer contour (9) for closely meshing twin-shaft extruders. A metallic powder material (13) is arranged step by step in layers in the direction of a production axis (Z-Z) on a work platform (11), wherein a laser beam (19) for each layer of the screw element (1) irradiates the powder material (13) according to the data of a three-dimensional model in a specific irradiation sequence at specific sites of the layer. The powder material (13) is melted, fully in places, and bonded with the directly underlying layer, so that after hardening of the layers, a complete, stable screw body (3) is produced. Further, the invention relates to a screw element produced in this way.

Description

technical field [0001] The present invention relates to a method especially for worm gear elements of co-rotating, closely meshing twin-shaft extruders. Furthermore, the invention relates to a worm gear element, in particular for closely intermeshing twin-shaft extruders rotating in the same direction, said worm gear element comprising a worm gear body with an axially extending through-bore for The internal teeth inserted on the support shaft and the external profile to provide the extrusion function. Background technique [0002] Worm gear elements of this type are used, for example, as part of twin-screw extruders in various fields of industry in which the processing of plastics is difficult. Worm gears used in twin-shaft extruders are constructed modularly and consist of a support shaft and a single worm gear element. The geometry of the worm gear elements is designed according to the task and function of the method technology of the twin-shaft extruder and is mounted a...

AI Technical Summary

Problems solved by technology

[0006] A disadvantage of known worm gear elements is that their manufacturing process is labor-intensive and cost-intensive

In addition, limited by traditional cutting methods and forming manufacturing methods, it is difficult or impossible to manufacture small diameters and specific internal and external geometries of worm gear elements when applying specific cemented carbides

[0007] Furthermore, through the use of hard metal and in combination with the hitherto applied manufacturing methods, the production of cooling channels in the worm gear element is very labor-intensive and can only be produced axially parallel, so that the outer contour cannot be cooled uniformly

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