Method for producing a twin screw cylinder provided with a wear-protective layer

Abstract

The invention relates to a method for producing a twin screw cylinder (1) provided with a wear-protective layer, according to which method two bores (11, 12), which run substantially parallel to each other and overlap each other, are made in a cylinder, and then two linings (21, 22) are introduced into the bores (11, 12), said linings being provided with a substantially C-shaped cross section, continuing from each other in the overlap region (10) of the bores (11, 12), forming the inner surface (110, 120) of the bores (11, 12) and acting as a wear-protective layer. The method is characterised in that firstly a first tubular lining (21) is introduced into a first of the bores (11) and is subsequently cut open in accordance with the diameter (D) of the other bore (12) to form the C-shaped cross section, and then a second tubular lining (22) is introduced into the second of the bores (12) and is subsequently cut open in accordance with the diameter (A) of the inner surface (110) of the first bore (11), said surface being formed by the first lining (21), thus forming the C-shaped cross section.

Description

technical field [0001] The invention relates to a method for producing a twin-screw cylinder provided with a wear protection layer, wherein two boreholes extending substantially parallel to each other and coincident with each other are introduced into the cylinder and the two inner linings are subsequently inserted into the borehole In the borehole, the lining layers have a substantially C-shaped cross-section and extend mutually to each other in the coincident region of the borehole, these lining layers form the inner surface of the borehole and serve as a wear protection layer. Background technique [0002] Twin-screw barrels are used in plastics processing by twin-screw extruders and house the extrusion screws. Various methods are known for producing such twin-screw cylinders, see for example US3277529, US3268949, US3010151 and DE2231046A1. [0003] In the known twin-screw barrels the wear protection layer is formed by first introducing bore holes in the barrel which wil...

AI Technical Summary

Problems solved by technology

[0004] The technique described above has proven to be effective for many years, but the manual production is expensive and during use, when the wear protection layer, which usually occurs only in regions, becomes worn, it entails the subsequent replacement of the entire cylinder, at least of the resulting wear The necessity of a protective layer for the entire inner liner

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