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WO1998018975A1 - Procede d'usinage d'aluminium dur repondant a la norme (us) 7075 t6 - Google Patents

Procede d'usinage d'aluminium dur repondant a la norme (us) 7075 t6 Download PDF

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Publication number
WO1998018975A1
WO1998018975A1 PCT/DK1997/000473 DK9700473W WO9818975A1 WO 1998018975 A1 WO1998018975 A1 WO 1998018975A1 DK 9700473 W DK9700473 W DK 9700473W WO 9818975 A1 WO9818975 A1 WO 9818975A1
Authority
WO
WIPO (PCT)
Prior art keywords
blank
hours
heating
working
temperature
Prior art date
Application number
PCT/DK1997/000473
Other languages
Danish (da)
English (en)
Inventor
Ole Frederiksen
Lars Frederiksen
Original Assignee
Ole Frederiksen
Lars Frederiksen
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ole Frederiksen, Lars Frederiksen filed Critical Ole Frederiksen
Priority to AU46994/97A priority Critical patent/AU4699497A/en
Publication of WO1998018975A1 publication Critical patent/WO1998018975A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent

Definitions

  • the present invention relates to a method of working hard-aluminium of extreme hardness, viz. in particular the type identified by US standard 7075 16 .
  • This metal is an aluminium alloy, rich in copper and zinc, is a product of the space technology, and in more important respects it is advantageous over the otherwise highly esteemed titanium alloys, not least with respect to the material price, but also concerning e.g. strength, corrosion resistance and lifetime with respect to fatigue fractures, the material having a high degree of flexibility.
  • the material is purchased as a heat cured and, option- ally, pre-stretched wire or plate material, which possesses the above qualities, yet not with respect to shapeability in cold condition. In that respect it corresponds, in principle, to other hard metal types such as spring steel and various titanium alloys, although due to its pronounced hardness (Brinell 150) it is still more difficult to shape, e.g. in "sharp" bendings ; also with this material, be it wire or plate shape, it is impossible to make very sharp bends without a resulting fracture, i.e. in the working thereof it is necessary to accept the well known limitation of keeping any radius of curvature higher than the thickness of the material.
  • the material may be heated for achieving an easy shape- ability, but only at the expense of its original strength.
  • the material in the shape of wire or plate, would be highly interesting for many appli- cations, if it was better suited for cold working.
  • the invention is based on a controlled heating/cooling treatment of a type that can be found to resemble the process disclosed in US-A-4 , 988 , 394 relating to the production of the blank material itself, only it has been found that the said special effect with respect to the shaping of the blanks is not achievable unless the degree of heating is controlled with extreme accuracy.
  • a temperature interval of 500-900°F (260-482°C) is prescribed, with 650-800°F (345-425°C) as the preferred interval, but with the invention it is a condition for obtaining the advantageous result that heating is effected - even at brief duration - to a very narrow temperature interval viz. 470-475°C.
  • the strength of the final product will also be drastically reduced, here probably with the explanation that the alloy has lost its original structure due to agglomeration of the different constituents, such that the material is no longer an alloy.
  • the first step in a process according to the invention is to effect the said heating of the blank or blanks to be worked, e.g. pieces of plate or wire material, and when this has resulted in a temperature rise to the critical interval, preferably within 60 seconds thereafter, the blanks are dumped into cold water. It could well be possible to arrange for such a sudden chilling in other ways, which would then also be comprised by the invention, but the simplest - and fully sufficient - solution will be such a dumping into cold water. It is important that this shock cooling is effected by a very rapid transfer, preferably within only few tenths of a second and thus in any way within only a few seconds, such that the blank temperature will not decrease noticeably before the dipping.
  • the blank will soon thereafter be overall cooled to the lower temperature, and after a few minutes it can be taken up for subsequent working.
  • the blanks will then be very willing shapeable within a period of up against 12 hours, though with gradually decreasing shapeability.
  • the shapeability is so good that it is possible to form sharply bent knee bendings, including sharp foldings through 180° of both plate and wire material.
  • other deformation work- ings such as hammering, die pressing and rounding may be performed.
  • the material can be worked as was it thin solder.
  • the worked blank when stored under normal conditions, will relatively slowly - e.g. through three months - re-establish its original hardness and strength, now even further amplified as a result of the applied cold working. Even in sharply bent areas the strength will increase correspondingly without giv- ing rise to deformation stress that could later on reveal itself as a fatigue fracture.
  • the said after-curing period can be shortened by a heating of the products, optimally to some 120°C for 2-3 days.
  • the after treatment may be further accelerated, e.g. by increasing the temperature to, for example, 150°C during some 4 hours only, but it seems as such a treatment tends to generally reduce the corrosion resistance of the products.
  • the finished products may be surface treated just as ordinary aluminium, including the possibility of colouring the surface with any desired colour.
  • the invention is related specifically to the said standard material, but it will be understood that other alloys may be produced and allotted other standard designations, though being so similar to the said material that they can be treated according to the invention with the same advantages. It is assumed that the specified values may be explained in metallurgical terms with respect to the relevant limiting conditions, and it may be possible to adapt the invention correspondingly.

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

L'invention porte sur un procédé d'usinage d'ébauches d'aluminium dur répondant à la norme spéciale USA 7075 T6 sinon difficiles à travailler par pliage, martelage ou autres. L'ébauche concernée est réchauffée jusqu'au point dit de ramollissement qui est d'environ 475 °C, ce réchauffage étant contrôlé avec une grande précision jusqu'à ce que la température de l'ébauche soit comprise entre 471-475 °C après quoi, dans les 60 secondes, l'ébauche est soumise à un brusque refroidissement par immersion brutale dans de l'eau froide avec de préférence une période de transition de seulement quelques dixièmes de seconde. Après refroidissement complet, l'ébauche, sortie de l'eau, est facilement usinable pendant les 12 heures et de préférence les 2-3 heures qui suivent. Le métal reprendra alors sa rigidité, et même à un degré plus élevé en raison de l'usinage à froid, au cours des quelques mois suivants, période qui peut cependant être écourtée par un réchauffage du produit, par exemple à 120 °C pendant 24 heures. Lors de l'usinage à froid, l'ébauche peut être travaillée presque comme de la soudure à l'étain c.-à-d. avec des arêtes ou des courbes extrêmement aiguës, et cela sans aucun affaiblissement ultérieur du produit.
PCT/DK1997/000473 1996-10-25 1997-10-27 Procede d'usinage d'aluminium dur repondant a la norme (us) 7075 t6 WO1998018975A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU46994/97A AU4699497A (en) 1996-10-25 1997-10-27 A method of working hard aluminium of standard type (us) aa 7075 t6

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK1187/96 1996-10-25
DK118796 1996-10-25

Publications (1)

Publication Number Publication Date
WO1998018975A1 true WO1998018975A1 (fr) 1998-05-07

Family

ID=8101966

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1997/000473 WO1998018975A1 (fr) 1996-10-25 1997-10-27 Procede d'usinage d'aluminium dur repondant a la norme (us) 7075 t6

Country Status (2)

Country Link
AU (1) AU4699497A (fr)
WO (1) WO1998018975A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1013879C2 (nl) * 1999-12-17 2000-10-03 Gemert Repair B V Van Werkwijze voor het vervaardigen van een omlijsting voor een raam met afgeronde hoeken, alsmede omlijsting vervaardigd volgens de werkwijze.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3071847A (en) * 1957-09-04 1963-01-08 Kaiser Aluminium Chem Corp Metal treatment
US3560269A (en) * 1967-12-07 1971-02-02 Aluminum Co Of America Non-earing aluminum alloy sheet
US4490188A (en) * 1981-07-06 1984-12-25 Rockwell International Corporation Method of imparting a fine grain structure to 2000 & 7000 series aluminum alloys
US4988394A (en) * 1988-10-12 1991-01-29 Aluminum Company Of America Method of producing unrecrystallized thin gauge aluminum products by heat treating and further working
WO1992003586A1 (fr) * 1990-08-22 1992-03-05 Comalco Aluminium Limited Alliage convenant a la fabrication de cannettes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3071847A (en) * 1957-09-04 1963-01-08 Kaiser Aluminium Chem Corp Metal treatment
US3560269A (en) * 1967-12-07 1971-02-02 Aluminum Co Of America Non-earing aluminum alloy sheet
US4490188A (en) * 1981-07-06 1984-12-25 Rockwell International Corporation Method of imparting a fine grain structure to 2000 & 7000 series aluminum alloys
US4988394A (en) * 1988-10-12 1991-01-29 Aluminum Company Of America Method of producing unrecrystallized thin gauge aluminum products by heat treating and further working
WO1992003586A1 (fr) * 1990-08-22 1992-03-05 Comalco Aluminium Limited Alliage convenant a la fabrication de cannettes

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
ANONYME, "MNC Handbok Nr. 12", 1983, SIS, (STOCKHOLM), pages 441-445. *
L.F. MONDOLFO, "Aluminum Alloys: Structure and Properties", 1976, BUTTERWORTHS, (LONDON), pages 844-845, 855-857. *
ROBERT B. ROSS, "Metallic Materials", 1968, CHAPMAN AND HALL LTD., (LONDON), pages 62-64. *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1013879C2 (nl) * 1999-12-17 2000-10-03 Gemert Repair B V Van Werkwijze voor het vervaardigen van een omlijsting voor een raam met afgeronde hoeken, alsmede omlijsting vervaardigd volgens de werkwijze.
EP1108848A1 (fr) * 1999-12-17 2001-06-20 van Gemert Repair B.V. Méthode de fabrication d'un cadre de fenêtre à coins arrondis et cadre obtenu par la méthode

Also Published As

Publication number Publication date
AU4699497A (en) 1998-05-22

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