EP3045567A1 - Methode et installation pour la fabrication et le décapage des barres en aluminium - Google Patents

Methode et installation pour la fabrication et le décapage des barres en aluminium Download PDF

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Publication number
EP3045567A1
EP3045567A1 EP16151146.4A EP16151146A EP3045567A1 EP 3045567 A1 EP3045567 A1 EP 3045567A1 EP 16151146 A EP16151146 A EP 16151146A EP 3045567 A1 EP3045567 A1 EP 3045567A1
Authority
EP
European Patent Office
Prior art keywords
bar
pickling
solution
plant
treatment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16151146.4A
Other languages
German (de)
English (en)
Other versions
EP3045567B1 (fr
Inventor
Massimo FESTA
Alessandro PALMANO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eural Gnutti SpA
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Eural Gnutti SpA
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Publication date
Application filed by Eural Gnutti SpA filed Critical Eural Gnutti SpA
Publication of EP3045567A1 publication Critical patent/EP3045567A1/fr
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Publication of EP3045567B1 publication Critical patent/EP3045567B1/fr
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/12—Light metals
    • C23G1/125—Light metals aluminium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C35/00—Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels for metal extruding
    • B21C35/02—Removing or drawing-off work
    • B21C35/023—Work treatment directly following extrusion, e.g. further deformation or surface treatment 
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
    • C23G3/021—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by dipping
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
    • C23G3/023—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by spraying
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
    • C23G3/027—Associated apparatus, e.g. for pretreating or after-treating
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
    • C23G3/027—Associated apparatus, e.g. for pretreating or after-treating
    • C23G3/028—Associated apparatus, e.g. for pretreating or after-treating for thermal or mechanical pretreatment

Definitions

  • the present invention relates to a method for the production of aluminium or aluminium alloy bars and a plant for performing said method.
  • the bar is then hardened, directly in a tank after the press or after transit through a solubilisation furnace and, after various specific processing, is sometimes aged. Lastly transit in the pickling tanks is performed to remove the surface oxides.
  • the pickling takes place in subsequent stages: for example, a first stage of washing with soda is followed by rinsing in water, then further washing in acid and further rinsing in water.
  • the pickling process has numerous drawbacks.
  • the pickling mediums usually soda and / or potash
  • the pickling mediums are dangerous to humans, harmful to health and the environment and must therefore be handled by staff using appropriate precautions and disposed of as special waste, generating significant costs.
  • the purpose of the present invention is to provide a method for the production of aluminium or aluminium alloy bars and a relative plant able to overcome the drawbacks referred to above.
  • FIG. 1 is a diagram of a plant adopting a method according to the present invention, according to a first embodiment of the invention
  • FIG. 2 is a diagram of a further plant adopting a method according to a further embodiment of the invention.
  • FIG. 3 is a diagram of yet a further plant adopting a method according to yet a further embodiment of the invention.
  • FIG. 4 is a diagram of a further plant adopting a method according to a further embodiment of the invention.
  • FIG. 5 and 6 show photographs of a portion of bar, respectively before and after a pickling treatment according to the invention.
  • a plant 1 comprises a heating furnace 2 fed with a semi-finished starting product 4a, for example a billet, made of aluminium or aluminium alloy.
  • the heating furnace is suitable to heat the semi-finished product 4a up to a predefined temperature, generally comprised between 200 - 650°C; a heated billet 4b comes out of the furnace 2.
  • the plant 1 further comprises a press 6, downstream of the heating furnace 2, suitable to receive the heated billet 4a in input and to perform on this a plastic deformation processing, typically an extrusion, thus obtaining a extruded bar, hot enough to be able to receive the thermal hardening treatment.
  • a press 6 downstream of the heating furnace 2, suitable to receive the heated billet 4a in input and to perform on this a plastic deformation processing, typically an extrusion, thus obtaining a extruded bar, hot enough to be able to receive the thermal hardening treatment.
  • the plant 1 further comprises a main tank 8, downstream of the press 6, and movement means 10, for example a conveyor belt, suitable to move the extruded bar from the press 6 inside the main tank 8.
  • movement means 10 for example a conveyor belt, suitable to move the extruded bar from the press 6 inside the main tank 8.
  • the main tank 8 contains a solution able to perform both the hardening of the bar and the pickling (or mere cleaning) of the same, freeing it, completely or in part, of the surface oxides.
  • the plant comprises a closed circuit, which the main tank is part of, for the recirculation and topping up of the solution.
  • the system comprises an open circuit, which the main tank is part of, for the drainage of the solution outside the plant, for example in a purifier.
  • the plant 1 further comprises further movement means 12, for example a conveyor belt, suitable to move the hardened and pickled bar 4c outside the main tank 8, towards the processing units 14 of the plant 1 for the performance of additional processing, such as drawing and/or cutting to size.
  • further movement means 12 for example a conveyor belt, suitable to move the hardened and pickled bar 4c outside the main tank 8, towards the processing units 14 of the plant 1 for the performance of additional processing, such as drawing and/or cutting to size.
  • the plant 1 further comprises an ageing furnace 16, downstream of the processing units 14 or directly downstream of the main tank 8, in which the bar undergoes an ageing process at temperature for a varying period of time.
  • said ageing process provides for a period in the furnace of the bar at 120° C for 24 hours or at 170° for 12 hours.
  • the bars 4d are generally transferred to a warehouse for storage.
  • a plant 100 comprises a heating furnace 102 supplied with the semi-finished starting product 4a; the heating furnace 102 is suitable to heat the semi-finished product 4a up to a predefined temperature, generally comprised between 200-650°C; a heated billet 4b comes out of the furnace 102.
  • the plant 100 further comprises a press 106, downstream of the heating furnace 102, suitable to receive in input the heated billet 4b and to obtain the extruded bar 4e.
  • the plant 100 further comprises a solubilisation furnace 105, downstream of the press 106, suitable to heat the extruded bar 4e to a predetermined temperature, for example between 350 ° - 600 ° C on the surface of the bar 4e.
  • the plant 100 comprises a main tank 108, downstream of the press 106 and the solubilisation furnace 105, and movement means 110, for example a conveyor belt, suitable to move the solubilised bar 4f from the solubilisation furnace 105 inside the main tank 108.
  • movement means 110 for example a conveyor belt, suitable to move the solubilised bar 4f from the solubilisation furnace 105 inside the main tank 108.
  • the main tank 108 contains the solution able to perform both the hardening of the bar and the pickling of the same, freeing it, completely or in part, of the surface oxides.
  • the plant comprises a closed circuit, which the main tank is part of, for the recirculation and topping up of the solution.
  • the system comprises an open circuit, which the main tank is part of, for the drainage of the solution outside the plant, for example in a purifier.
  • the plant 100 further comprises processing units 114 for the performance of additional processing, such as drawing and/or cutting to size, and/or an ageing furnace 116, downstream of the processing units 114 or directly downstream of the main tank 108, in which the bar undergoes an ageing process at temperature for a varying period of time.
  • additional processing such as drawing and/or cutting to size
  • an ageing furnace 116 downstream of the processing units 114 or directly downstream of the main tank 108, in which the bar undergoes an ageing process at temperature for a varying period of time.
  • said ageing process provides for a period in the furnace of the bar at 120° C for 24 hours or at 170° for 12 hours.
  • both the hardening and the pickling (or simple cleaning) of the bar takes place, preferably simultaneously, through the use of a suitable solution.
  • a plant 200 comprises a heating furnace 202 supplied with the semi-finished starting product 4a, which the heated billet 4b comes out of, a press 206, downstream of the heating furnace 202, suitable to receive in input the heated billet 4b and to obtain the extruded bar 4e and a hardening tank 209, downstream of the press 206.
  • the hardening tank 209 contains hardening solution able to carry out the hardening of the extruded bar, obtaining a hardened bar 4g.
  • said hardened 4g bar is subjected to a pickling treatment in a main tank 208 containing the solution able to perform the pickling, freeing the bar, completely or in part, of the surface oxides.
  • Said pickling treatment is performed after heating the bar and / or heating the solution, so as to activate the chemical pickling process.
  • the hardening process or hardening and pickling process take place by striking the bar with a jet of a solution.
  • a plant 300 is provided with jet means 308, for example, structurally integrated with the press 6, together with the forming die of the bar.
  • the jet means 308 are suitable to strike the formed bar in the press with a jet of a suitable solution to achieve the hardening and the simultaneous pickling and / or full or partial cleaning of the surface oxides from the bar.
  • the appropriate solution for performing the simultaneous hardening and pickling or pickling only comprises water and a predefined amount of an organic acid.
  • the organic acid is selected from the group comprising citric acid, tartaric acid, acetic acid, formic acid, oxalic acid and combinations thereof.
  • Solutions containing 1 - 100% of organic acid have proved suitable.
  • solutions are used containing from 1% to 50% of organic acid, more preferably from 10% to 30% of organic acid, even more preferably from 5% to 10% of organic acid.
  • Figure 5 is a photograph showing a cross-section of bar at 550°C before hardening and simultaneous pickling
  • Figure 6 is a photograph which shows the same portion of bar as Figure 5 , after hardening and contemporary pickling in a solution of water and citric acid, at a concentration of between 10% and 30%.
  • the bar before hardening and simultaneous pickling and the relative solution contained in the main tank 8, 108 ( Figures 1 and 2 ) or sprayed by the jet means 308 ( Figure 4 ), constitute a plant, the thermodynamic state of which allows activation of the pickling, since it has the energy needed to activate the chemical process.
  • the solution is "cold", i.e. kept at ambient temperature, while the bar is "hot”, i.e. is at a sufficiently high temperature so that when immersed in the solution it activates the pickling action of the latter.
  • the bar before pickling alone and the relative solution contained in the main tank 208 constitute a plant, the thermodynamic state of which allows activation of the pickling, since it has the energy needed to activate the chemical process.
  • the solution is "cold", i.e. kept at ambient temperature, while the bar is "hot”, i.e. is brought to a sufficiently high temperature so that when immersed in the solution it activates the pickling action of the latter; or the solution is "hot", i.e. kept at a predefined temperature higher the ambient temperature, and the bar is "cold.”
  • both the bar and the solution are sufficiently “hot”.
  • the solution containing the organic acid does not have an environmental impact such as to be treated as special waste and disposed of accordingly and, at least within certain limits, is not particularly dangerous to man.
  • the present invention permits a considerable energy saving, adequately exploiting the thermal energy possessed by the bar before hardening.
  • the bar before hardening, the bar is at a sufficiently high temperature to be effectively hardened; at the same time, this thermal energy is used to activate the pickling action of the solution when the bar is immersed in it, or struck by it.
  • the invention makes it possible to considerably reduce production times.
  • the invention makes it possible to lengthen the life of the plant, as it has no components in contact with highly corrosive agents such as soda and / or potash.
  • the treatment of pickling only off-line is performed after a possible solubilisation treatment and / or between any additional processing.
  • the treatment of pickling only off-line is performed after a treatment of hardening only and / or between any additional processing.
  • the jet means are used for hardening only and/or pickling only by means of the appropriate solution.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
EP16151146.4A 2015-01-16 2016-01-13 Methode pour la fabrication et le décapage des barres en aluminium Active EP3045567B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITBS20150005 2015-01-16

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EP3045567A1 true EP3045567A1 (fr) 2016-07-20
EP3045567B1 EP3045567B1 (fr) 2022-08-31

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1121677A (en) * 1964-12-02 1968-07-31 Pechiney Prod Chimiques Sa Production of coloured aluminium-silicon alloys
US3537895A (en) * 1965-04-27 1970-11-03 Lancy Lab Copper and aluminum pickling
US3766763A (en) * 1971-01-13 1973-10-23 Southwire Co Continuous rolled rod direct cooling method and apparatus
GB1394694A (en) * 1971-10-28 1975-05-21 Montedison Spa Lead acid accumulator or storage battery with supporting and/or connecting parts made of lihgt alloys
US3983889A (en) * 1974-05-20 1976-10-05 Leichtmetall-Gesellschaft Mbh Process for cleaning the surface of continuously cast strip
CN201419234Y (zh) * 2009-05-19 2010-03-10 贾国荣 一种上引法无氧铝杆连铸生产线
CN101767124A (zh) * 2009-12-23 2010-07-07 台山市金桥铝型材厂有限公司 一种铝材刷棒装置
CN202398636U (zh) * 2012-04-28 2012-08-29 天津市津和双金属线材有限公司 一种铝杆乳化液清洗装置
CN203754788U (zh) * 2014-03-27 2014-08-06 湖南创元铝业有限公司 圆铝杆的清洗和冷却装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5909742A (en) * 1993-03-26 1999-06-08 Betzdearborn Inc. Metal cleaning method
JP3646434B2 (ja) * 1996-10-23 2005-05-11 三菱化学株式会社 電子写真感光体の製造方法
EP2369020B1 (fr) * 2010-03-16 2016-10-05 Thermission AG Procédé de traitement d'un élément métallique pour une automobile

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1121677A (en) * 1964-12-02 1968-07-31 Pechiney Prod Chimiques Sa Production of coloured aluminium-silicon alloys
US3537895A (en) * 1965-04-27 1970-11-03 Lancy Lab Copper and aluminum pickling
US3766763A (en) * 1971-01-13 1973-10-23 Southwire Co Continuous rolled rod direct cooling method and apparatus
GB1394694A (en) * 1971-10-28 1975-05-21 Montedison Spa Lead acid accumulator or storage battery with supporting and/or connecting parts made of lihgt alloys
US3983889A (en) * 1974-05-20 1976-10-05 Leichtmetall-Gesellschaft Mbh Process for cleaning the surface of continuously cast strip
CN201419234Y (zh) * 2009-05-19 2010-03-10 贾国荣 一种上引法无氧铝杆连铸生产线
CN101767124A (zh) * 2009-12-23 2010-07-07 台山市金桥铝型材厂有限公司 一种铝材刷棒装置
CN202398636U (zh) * 2012-04-28 2012-08-29 天津市津和双金属线材有限公司 一种铝杆乳化液清洗装置
CN203754788U (zh) * 2014-03-27 2014-08-06 湖南创元铝业有限公司 圆铝杆的清洗和冷却装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JOSEPH A. MAGA; ANTHONY T. TU, FOOD ADDITIVE TOXICOLOGY

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