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Abstract

A method is disclosed for producing extrusion profiles of a desired length, including the steps of processing a billet of preselected billet length in a press, measuring the extruded length during the extrusion process, and either switching off the extrusion process upon reaching the desired extruded length and varying the billet length such as to obtain the optimum butt thickness, or switching off the extrusion process upon reaching the minimum permissible butt thickness and enlarging the billet length such as to obtain the desired extrusion length. The apparatus for performing the method includes a billet hot shearing unit which has an adjustable longitudinal feed stop and cuts the billets to length. The billets are supplied to, and are processed in, a press in which a first length recorder measures the butt thickness and from which the extruded profile is drawn out by an extrusion drawing unit. A second length recorder measures the extrusion length. The measured actual values of the butt thickness and the extrusion length are supplied to a controller which compares them alternately with corresponding reference input values of the butt thickness or the extrusion length, respectively, and actuates a positioning element which adjusts the longitudinal feed stop such as to eliminate a difference between the reference and actual values.

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First Claim