Metal deforming – By extruding through orifice – With product handling
Patent
1993-02-02
1994-07-12
Larson, Lowell A.
Metal deforming
By extruding through orifice
With product handling
72201, B21C 2900
Patent
active
053277635
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for cooling extrusion press profile sections having an upper air nozzle arranged above an exit path of the extruded profile section and having a slit-like nozzle opening, and lower air nozzles arranged beneath the exit path offset in the transport direction with respect to the upper nozzle and at a smaller distance from the extruded profile section than the upper nozzle.
Profile sections made by an extrusion press must be cooled after leaving the press die. This applies in particular to extrusion press profile sections of lightweight metal alloys. The necessary temperature/time gradients lie between 3.degree. and 5.degree. K./s for AlMgSi alloys and up to 50.degree. K./s for high-strength alloys, for example aviation materials.
The necessary high cooling rates can be achieved by drawing the bars or rods through a stationary water wave or by cooling the extrusion press profile sections in so-called "water boxes" having walls provided with spray nozzles. Admittedly, this achieves the necessary cooling rates as regards the metallurgical requirements; however, by the very rapid cooling, which is moreover not uniform over the periphery, the extrusion press profile sections are deformed and as a result high expenditure for subsequent adjustment is frequently necessary. Moreover, with the water cooling means available at present a specific influencing of the cooling action is hardly possible. Finally, due not least to the cooling water processing involved the use of cooling water is always far more complicated economically than the fundamentally likewise possible simple cooling with ambient air and consequently the aim is to use only air for cooling as many extrusion press profile sections as possible, including for example lightweight metal extruded sections with small wall thickness.
From U.S. Pat. No. 4,790,167 an apparatus is known for cooling extruded forms in which outside the extrusion path of the forms a compressed air distributor is arranged having an elongated nozzle arranged along the extrusion path and comprising a slit-like nozzle opening. For adaptation to different profile forms the use of a plurality of air nozzles arranged along the extrusion path below the conveying plane is proposed. The compressed air is directed from below through individual air spraying nozzles onto the extruded articles. After leaving the extrusion apparatus the extruded sections are cut into lengths and thereafter conveyed on transport means running in the exit direction with their longitudinal axes parallel to the longitudinal axis of the upper slit nozzle beneath said slit nozzle. With this known type of cooling, the extruded articles are subjected to cooling air from above uniformly only if their profile is not appreciably wider than the slit-like opening of the upper nozzle. Even then, adequate cooling is ensured only if the extruded articles are each held for a certain time beneath the upper nozzle. For this reason and because of the individual spray nozzles arranged beneath the transport plane, neither adequate nor uniform cooling air action on a continuously transported extruded profile section is possible.
However, the conventional air cooling apparatuses cannot achieve the high cooling rates necessary for metallurgical reasons and are suitable only for cooling the extruded profile sections to a temperature permitting the handling necessary for the further production sequence, that is cutting, straightening, packaging, etc.
For these reasons, in the production of extruded profile sections there is simply a choice between two unsatisfactory alternatives, that is a metallurgically adequate cooling with water, leading however to a high distortion of the extruded profile sections in conjunction with high subsequent straightening and cooling water expenditure or the simple cooling with ambient air, which however provides only relatively low cooling rates and thus does not meet the metallurgical requirements.
The invention is therefore based on the problem of providing an apparatus f
REFERENCES:
patent: 4210288 (1980-07-01), Dobson
patent: 4300376 (1981-11-01), Wilmotte
patent: 4453321 (1984-06-01), McDonald et al.
patent: 4790167 (1988-12-01), Gentry et al.
1-317615 dated Mar. 6, 1990, English Abstract Japan.
Kramer Carl
Menzler Dirk
Larson Lowell A.
WSP Ingenieurgesellschaft fur Warmetechnik
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