Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K23/00—Alumino-thermic welding

Definitions

• the invention relates to a transportable reaction crucible for a metallothermal, in particular aluminothermic, sweat portion for single use with a crucible shell with a cylindrical jacket and a flat bottom and with a lid and with a refractory lining in the crucible shell, which absorbs the sweat portion and with its bottom a heatable bottom opening is provided.
• reaction crucible Such a reaction crucible is known from DE - 197 02410 C1.
• the actual reaction crucible is stamped or shot into a metallic crucible shell in the form of a lining made of a sand mixture.
• the shell must be made of a high-strength, metallic, heavy material.
• a lighter and cheaper material such as cardboard, plastic or the like cannot be used.
• the lining has a flat bottom corresponding to the flat bottom of the crucible shell, the outflow of the melting material to the bottom opening is not promoted.
• the sweat portion is either in a commercially available tin can or in a conventional plastic bag or in a other wrapping introduced.
• This object is achieved in that on the flat bottom of the crucible shell made of a non-metallic material there is a support disk made of a refractory material with its flat underside, the upper side of which is conical towards a central opening, and that the refractory is adapted to the inside diameter of the jacket Lining is a separately manufactured and inserted into the jacket cylindrical reaction vessel, the bottom of which is conical in accordance with the top of the support disk and rests on the disk and engages with a hollow guide lug in the central opening of the support disk.
• the crucible shell does not have to serve as the outer shape for the reaction vessel at the same time, it can be made from a non-metallic material such as cardboard, hard paper, plastic or the like. At least the cylindrical jacket and the bottom of the crucible shell are preferably made of cardboard, plastic or the like. The cardboard is particularly preferred as the material.
• the reaction vessel which is manufactured as a separate component, has a conical bottom. The support plate ensures that the reaction vessel is securely supported and centered in the crucible shell.
• the balancing of manufacturing tolerances in the manufacture of the reaction vessel and / or the build-up of the total wall thicknesses required for the melting reaction can be achieved in a preferred manner by changing the outside diameter of the reaction vessel a predetermined amount is smaller than the inner diameter of the jacket and the annular space is filled with a refractory material, preferably in finely divided form.
• the cylindrical jacket and the bottom of the crucible shell and at least one cover of the reaction container made of cardboard, hard paper or the like, preferably provided with an opening to be made of the same material as the crucible shell.
• at least one cover of the reaction crucible preferably provided with an opening, consists of a refractory material.
• the cylindrical jacket of the crucible shell projects beyond the free edge of the reaction vessel and at least one of the lids rests on the free edge of the reaction vessel and is held by the protruding jacket section.
• a film is preferably provided which extends over the upper edge of the crucible shell.
• the parts of the crucible shell made of cardboard, plastic or the like are equipped to prevent moisture penetration, e.g. when using cardboard for the crucible shell, the cardboard is laminated on the inside with a metal foil or the cardboard is provided with an internal film.
• the guide approach can be in one piece with the reaction vessel or as a separate one Component be formed. In the case of the separate design, the introduction of the melt seal into the guide attachment defining the bottom opening of the reaction vessel is facilitated.
• a particularly stable structure of the crucible shell is obtained if the bottom of the crucible shell is provided with a circumferential flange and is glued into the shell in such a way that the free edges of the shell and flange lie in one plane.
• a different refractory material is preferably used for the support disk than for the reaction vessel, since the support disk is subjected to less thermal stress than the reaction vessel when the crucible is used.
• the filling material for the annular gap between the jacket and the reaction vessel is also subjected to less thermal stress than the reaction vessel and can therefore also be different.
• the sweat portion is preferably introduced into the reaction vessel as a free bed and the lid or lids are sealed airtight and / or moisture proof.
• Fig. 1. a vertical section through a reaction crucible, Fig. 2. a vertical partial section through a lid with dust filter and
• Fig. 3. a partial vertical section through the bottom area of a
• Reaction bar in which the guide neck of the reaction vessel is made as a separate component.
• a crucible shell 2 which has a cylindrical shell 3 and a flat bottom 4.
• Jacket 3 and bottom 4 are made of cardboard, which is equipped on the inside with a moisture-blocking aluminum liner K.
• the bottom 4 has a bottom section 4a and a circumferential flange 4b. The bottom is glued into the casing 3 such that the free lower edge 3a of the casing and the free edge 4c of the flange lie in one plane.
• the base designed in this way serves to stiffen the crucible shell.
• a support disk 5 On the flat upper side of the bottom section 4a there is a support disk 5, which has an outer diameter which is matched to the inner diameter of the jacket and is made of a first refractory material F1 and has a flat underside 5a.
• the top 5b of the support disc is conical to a central opening 5c.
• the central opening 5c tapers conically downwards.
• the outer lateral surface 5d of the support disk 5 is slightly tapered upwards.
• the top 6b of the bottom 6 is conically inclined toward a central drain opening 6c corresponding to the taper of the bottom 6a, which extends downward into the bottom 6a of the bottom 6 and into which conical opening 5c of the support disk engaging guide projection 6d is formed.
• the axial length of the hollow guide projection 6d, which is formed in one piece with the bottom 6, is dimensioned such that it is flush with the underside 5a of the support disk.
• a seal 8 which is meltable by the metallothermal reaction is inserted in the opening 6c.
• the cardboard floor below the opening 6c burns. However, it is also possible to pre-punch the floor below the opening.
• the jacket 9 of the reaction vessel 7 is formed in one piece with the bottom 6.
• the jacket 9 has a straight cylindrical outer surface 9a and a conically tapering inner surface on 9b, so that the wall thickness of the jacket increases from top to bottom.
• the outer diameter of the jacket is preferably chosen so that it is smaller than the inner diameter of the jacket 3 of the crucible shell.
• the ring space 10 thus spanned is filled and fixed with a finely divided refractory product F3 such as sand and thus centers the support plate 5 and the reaction vessel 7 in the crucible shell.
• the jacket 3 projects beyond the free upper edge 9c of the reaction vessel 7 by an amount which corresponds to the thickness of a lid 11 made of the refractory material F2 placed on the upper edge 9c.
• the diameter of the cover 11 corresponds to the inside diameter of the casing 3.
• the cover 11 is provided with an ignition opening 11a, through which the weld portion 6 introduced can be ignited.
• a film 12 is applied to the top of the cover, which overlaps at least part of the casing 3. It is also possible to cover the entire reaction crucible with a film, preferably shrink film. For easier handling of the disposable crucible, one or more carrying handles 13 are also attached to the jacket.
• the embodiment shown is still a cover 11 Associated dust filter 14, which spans the central opening 11a.
• the dust filter 14 consists of an annular refractory fleece 14a, which is held between the top of the cover 11 and a cover plate 14b. In the melting reaction, the gases flow through the opening 11a into the interior of the filter and flow radially outward.
• a second opening 11b can be provided in the cover as an ignition opening.
• the filter structure can also be covered with a shrink film.
• a guide projection 15 is provided which is separate from the bottom 6 of the reaction vessel and is inserted into a corresponding opening 6e in the bottom.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Crucibles And Fluidized-Bed Furnaces (AREA)
• Furnace Housings, Linings, Walls, And Ceilings (AREA)
• Physical Or Chemical Processes And Apparatus (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Materials For Medical Uses (AREA)
• Standing Axle, Rod, Or Tube Structures Coupled By Welding, Adhesion, Or Deposition (AREA)
• Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
• Pressure Welding/Diffusion-Bonding (AREA)

Priority Applications (13)

Applications Claiming Priority (2)

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Family

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Cited By (4)

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Citations (4)

Family Cites Families (8)

• 1998
  • 1998-05-22 DE DE19822851A patent/DE19822851A1/de not_active Withdrawn
• 1999
  • 1999-05-21 CA CA002374682A patent/CA2374682C/en not_active Expired - Fee Related
  • 1999-05-21 CZ CZ20004360A patent/CZ295718B6/cs not_active IP Right Cessation
  • 1999-05-21 PL PL372509A patent/PL190830B1/pl unknown
  • 1999-05-21 PL PL99344450A patent/PL190353B1/pl not_active IP Right Cessation
  • 1999-05-21 DK DK99927746T patent/DK1100646T3/da active
  • 1999-05-21 JP JP2000550634A patent/JP4580551B2/ja not_active Expired - Fee Related
  • 1999-05-21 CN CN99808834A patent/CN1108894C/zh not_active Expired - Lifetime
  • 1999-05-21 ES ES99927746T patent/ES2237111T3/es not_active Expired - Lifetime
  • 1999-05-21 HU HU0102253A patent/HU222660B1/hu not_active IP Right Cessation
  • 1999-05-21 DE DE59911499T patent/DE59911499D1/de not_active Expired - Lifetime
  • 1999-05-21 DE DE19980928T patent/DE19980928B4/de not_active Expired - Fee Related
  • 1999-05-21 WO PCT/EP1999/003519 patent/WO1999061194A1/de not_active Ceased
  • 1999-05-21 EP EP99927746A patent/EP1100646B1/de not_active Expired - Lifetime
  • 1999-05-21 AU AU45000/99A patent/AU765698C/en not_active Ceased
  • 1999-05-21 RU RU2000132210/02A patent/RU2220831C2/ru active
  • 1999-05-21 BR BR9911063-6A patent/BR9911063A/pt not_active IP Right Cessation
  • 1999-05-21 AT AT99927746T patent/ATE287310T1/de active
• 2000
  • 2000-11-22 US US09/726,716 patent/US6484792B1/en not_active Expired - Lifetime
  • 2000-12-15 ZA ZA200007522A patent/ZA200007522B/en unknown

Patent Citations (4)

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