Classifications

• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
  • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
  • C21D9/0025—Supports; Baskets; Containers; Covers

Definitions

• the invention relates to a glow basket made of steel for receiving bulk parts made of aluminum for degreasing and soft annealing, with a bottom and projecting side walls delimited by a frame.
• Incandescent baskets of the type mentioned at the outset are used, for example, for degreasing and soft annealing aluminum slugs for the production of extruded can and tube bodies as well as technical extruded parts.
• Incandescent baskets of conventional design consist of a frame in which the bottom and the side walls are welded.
• an annealing temperature in the range between approximately 350 and 500 ° C.
• the lubricant film initially adhering to the surface of the slugs evaporates, so that the slugs lose their initial lubricity with increasing temperature.
• the invention is therefore based on the object of providing a glow basket of the type mentioned at the outset, with which the local deformations which arise due to the build-up of pressure as a result of the thermal expansion on the soft aluminum parts can be avoided.
• At least one side wall with the frame has at least one when it is heated to the annealing temperature.
• the plastically deforming aluminum element is connected in such a way that the side wall shifts outwards by at least one area adjacent to the frame while increasing the basket volume.
• the pressure is reduced by the plastic deformation of the element softening to the same extent as the aluminum parts by the displacement of the side wall.
• angles are attached to at least one side wall in an edge region, which are opposite angles attached to the frame and which together form a receiving space for inserting the element.
• the element is preferably a profile or a plate made of aluminum with an essentially rectangular cross section.
• the frame can also be designed as a U-profile which is open at the bottom and the element can be inserted into the U-profile as an aluminum profile with a substantially rectangular cross-section, the side wall abutting the aluminum profile laterally in an edge region.
• the annealing basket according to the invention can be used for degreasing and soft annealing of any kind of aluminum parts.
• a particularly preferred area of application is the degreasing and soft annealing of slugs made of aluminum for the extrusion molding of can and tube bodies as well as technical extrusion parts.
• FIG. 1 is an oblique view of a glow basket filled with slugs.
• FIG. 2 is a partial section through the glow basket of Figure 1 along the line l-l in two operating states.
• FIG. 3 shows a second embodiment of a connection between the frame and the side wall of a glow basket in two operating states
• FIG. 4 shows an oblique view of a third embodiment of a connection between the frame and the side wall of a glow basket
• FIG. 5 shows the third embodiment of FIG. 4 in two operating states.
• a glow basket 10 shown in FIG. 1 for degreasing or soft annealing of mass parts consists of frame parts 12 made of steel standing at right angles to one another and joined together to form a frame with an inserted base 14 and side walls 16 of sheet steel rising up from this. At least two opposite side walls 16 and possibly also the bottom 14 are provided with openings or perforations 18.
• the perforations 18 serve to pass hot gases through the mass parts filled into the glow basket 10 during their glowing in a glow furnace which receives the glow basket 10 and is not shown in the drawing for reasons of clarity.
• the glow basket 10 has, for example, a width b and a depth t of 1000 mm each, the height h is, for example, 400 mm.
• the mass parts are stamped slugs 20 made of pure aluminum, which are provided, for example, for extruding aerosol cans.
• the slugs For example, they have a diameter of 60 mm and a thickness of 4 mm.
• the bottom 14 and three of the side walls 16 are welded to the frame parts 12.
• a side wall 16 is detachably inserted into the frame and releasably attached to an upper frame part 12.
• angle irons 22 are welded to the upper frame part and angle irons 24 to the side wall 16 and are aligned with one another in such a way that they have a cross-section a receiving space for the form-fitting pushing through of a profile 26 made of pure aluminum with an essentially rectangular cross section, for example with a width e of 60 mm and one Form thickness f of 4 mm.
• FIG. 2a shows the releasable connection between the side wall 16 and the upper or lower frame part 12 in a first operating state before an annealing treatment of the slugs 20.
• the lower frame part 12 serves as a fixed stop in the exemplary embodiment shown.
• the side wall 16 is detachably connected to the upper frame part 12 via the profile 26 inserted between the angle irons 22, 24.
• the surface of the slugs filled for glow in the glow basket 10 is covered by the preceding rolling and punching process with a lubricant film which, when the slugs are poured into the glow basket, leads to a practically unimpeded sliding of the slugs 20 and thus to a compact filling of the glow basket 10.
• the glow basket 10 filled with slugs 20 is flowed through by hot gases in the annealing furnace, the slugs 20 heating up to a temperature T between approximately 350 and 500 ° C. during the annealing process.
• the evaporation of the lubricant film increasingly hinders the slugs 20 from joining together as the temperature rises.
• the slugs 20 expand with increasing temperature.
• the above-mentioned pressure build-up within the glow basket J0 can be counteracted during the glow.
• the profile 26 made of pure aluminum heats up to approximately the same extent, ie the profile 26 softens as well as the slugs 20.
• the profile 26 begins to plastically deform under the pressure acting on the side wall.
• the side wall 16 moves outwards in the region of the upper frame part 12 by a distance s of, for example, approximately 15 mm (FIG. 2b).
• the deformation energy is almost completely absorbed by the profile 26, so that the slugs 20 no longer have any injuries after the annealing. Since the heating and the evaporation of the lubricating film in the lower region of the glow basket 10 are slowed down compared to the upper region, it is not necessary; to provide the connection between the side wall 16 and the lower frame part 12 also with a plastically deformable connection. After the. Annealing operation, the plastically deformed profile 26 is replaced by a new profile and the annealing basket is available again for the next annealing process.
• FIG. 3 Another embodiment of a releasable connection between a frame part 12 and a side wall 16 is shown in FIG. 3.
• the upper frame part is designed as a U-profile frame 28, the mutual distance between the legs of the downwardly open U-profile being adapted to the thickness f of the profile 26, so that the latter is held in a force-locking manner.
• the deformation of the profile 26 by the pressure P building up during the temperature increase takes place in the same way as in the variant of FIG. 2 and also leads here to a displacement of the side wall in the region of the upper frame part 12 by an amount s of the order of 15 mm (Fig. 3b).
• FIGS. 4 and 5 Another embodiment of a releasable connection between a frame part 12 and a side wall 16 is shown in FIGS. 4 and 5.
• the lower angle iron 24 is fixed here to a spacer 25, which in turn is welded to the side wall 16.
• Frame part 12 On the top .
• Frame part 12 is an angle stop 29 directed towards the inside of the glow basket and welded on as a rear stop for the detachably fastened side wall 16.
• An aluminum profile in the form of a plate is inserted between the angle irons 22, 24.
• a locking bar 27 is arranged on the lower angle iron 24 in the tilting direction.
• connection system shown in FIGS. 4 and 5 has a length of, for example, 100 mm.
• a connection system For the releasable attachment of a side wall 16 to an upper frame part 12, it is generally sufficient to arrange such a connection system approximately in the middle of the frame part.
• the after a glow Operation-deformed aluminum plate 26 can be knocked out of its holder formed by the two angle irons 22, 24 without great effort and replaced by a new plate for the next annealing process.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Thermal Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Heat Treatment Of Articles (AREA)
• Heat Treatments In General, Especially Conveying And Cooling (AREA)
• Furnace Charging Or Discharging (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Coating With Molten Metal (AREA)
• Forging (AREA)

Priority Applications (1)

Applications Claiming Priority (4)

Publications (2)

Family

ID=8236407

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• 1998
  • 1998-10-26 EP EP98811073A patent/EP0997541A1/fr not_active Withdrawn
• 1999
  • 1999-10-08 DE DE59903357T patent/DE59903357D1/de not_active Expired - Fee Related
  • 1999-10-08 AU AU63360/99A patent/AU6336099A/en not_active Abandoned
  • 1999-10-08 CA CA002348630A patent/CA2348630A1/fr not_active Abandoned
  • 1999-10-08 EP EP99950673A patent/EP1124997B1/fr not_active Expired - Lifetime
  • 1999-10-08 AT AT99950673T patent/ATE227350T1/de not_active IP Right Cessation
  • 1999-10-08 US US09/830,453 patent/US6558615B1/en not_active Expired - Fee Related
  • 1999-10-08 WO PCT/EP1999/007549 patent/WO2000024942A1/fr not_active Ceased

Non-Patent Citations (1)

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