Metal deforming – By extruding through orifice – With product handling
Patent
1998-08-21
1999-06-01
Hail, III, Joseph J.
Metal deforming
By extruding through orifice
With product handling
72256, 72300, 1984632, 1984682, B21C 3500
Patent
active
059079681
DESCRIPTION:
BRIEF SUMMARY
The metallic sections produced in an extrusion press are received by a delivery end. The delivery ends may be in the form of delivery tables in conjunction with removal devices (as known for example from EP 0 300 262 B1) or delivery conveyors (as known for example from DE 39 36 177 C2). The sections are conveyed individually or in groups in the operating cycle of the extrusion press transversely over a cooling bed to a stretcher-leveller and, after they have been levelled, to a longitudinal conveyor which conveys the sections to a saw or shears for cutting up into lengths suitable for commercial purposes and finally to a stacking device. At the delivery end behind the extrusion press the temperature of sections consisting of aluminium is in the range of from 450.degree. to 500.degree. C. for example. In order to be able to level the sections successfully by stretching, their temperature has to be lowered to below 80.degree. C., for which purpose the cooling bed constructed in the form of a transverse conveyor is provided. The dwell period of the sections on the cooling bed and therefore the path of transverse conveying is reduced by fans which are arranged below the transverse conveyor and which generate an air flow directed from below against the sections to be cooled (Journal "Aluminium", Vol. 47 (1971) No. 9, pp. 545 to 549, in particular p. 547, DE-OS 2 015 664).
Whereas symmetrical sections cool without distortion, asymmetrical sections tend to become distorted, which is counteracted by the fact that the ends of rolled sections are gripped in clamps and the sections are held under tensile stress during the transverse conveying between the clamps, as is known from the U.S. Pat. No. 1,441,354 and DE-AS 1 216 657, in which case the tensile stress is automatically built up as shrinkage stress between the clamps or is applied by way of a piston-cylinder unit acting upon one of the clamps.
Extruded sections, on which particularly exacting demands are made with respect to their straightness, are levelled by stretching in a stretcher-leveller, referred to in brief as a stretching device, after cooling below 80.degree. C. The introduction of asymmetrical sections, which tend to become distorted, into the clamping jaws of the stretcher-leveller gives rise to problems and stands in the way of automating the operating procedure. For this reason, asymmetrical sections or groups of asymmetrical sections which tend to become distorted are gripped at their ends on the delivery table or the delivery conveyor by clamps of a pair of clamps which follow during the transverse conveying and hold the sections with a longitudinal stressing to eliminate the distortion thereof entirely or substantially and insert the section or the closed group of sections into the clamps of the stretcher-leveller and which are released only after the clamps of the stretcher-leveller have gripped the section or sections. In this case, in order to achieve an adequate throughput, two or more pairs of clamps are provided, which have to be offset from one another in the longitudinal direction of the sections by the distance of at least the depth of a clamping jaw, in order to be capable of being moved in their intersecting operating areas, the clamps being offset alternately in order to keep short the end portions of the sections damaged by the gripping. In order that the clamps can be returned to their starting position from an end position in which they transfer a section or a group of sections to a further pair of clamps or to the clamps of the stretcher-leveller, the clamps are supported by vertical columns which are displaceable in guides, the guides being movable on horizontal rails in the transverse conveying direction. The sections are arranged with one end always in the line formed by the saw or shears at the delivery end of the press and the stationary part of the stretcher-leveller, so that the horizontal rails for guiding the clamps gripping the sections at the said ends can be arranged in a stationary manner. Like the second part of t
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Muschalik Uwe
Steinmetz Alfred
Vetten Josef
Zeuch Bernhard
Hail III Joseph J.
SMS Eumuco GmbH
Tolan Ed
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