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
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C1/00—Making non-ferrous alloys
  • C22C1/02—Making non-ferrous alloys by melting
• • 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

Definitions

• This invention relates to an improvement in aluminummanganese alloys and in the method of processing same. Alloys defined by the symbol A-Ml, in accordance with norms Afnor Nos. A-02.001 and A02.002, are well known. Their compositions, in percent by weight, may
• alloys find use, after being annealed and rolled or rolled with semi-hard hammer-hardening or forging, for the making of sheets of a metal in the form of boiler plate, or for stampings or cuttings.
• dished or cupped members obtained by stamping or by a type of embossing, mandrel or roll forming (referred to in French more appropriately as repoussage) (hereinafter referred to as mandrel forming) of sheets of tempered A-Ml alloy are characterized by a fault which consists of the appearance of abnormal protuberances of material referred to in the trade as horns.
• the degree of horn formation is obtained as a percentage from the equation:
• D percent- WHID in which H is the height of the tallest horn in the cup, h, is the height of the various openings between the horns, n is the number of horns and H is the average height of the cup.
• C percent is thus the percentage of the height of the cup affected by the defect.
• the present invention is addressed to substantially reducing the formation of horns during the stamping or the mandrel forming (repoussage) of sheets of A-Ml alloy and it is an object of this invention to provide a method and means for accomplishing same.
• the silicon in A-Ml alloy was considered as a harmful constituent such that it was proposed to limit the amount of silicon to a maximum of 0.3%.
• the effect of the silicon content can be illustrated by three series of tests in which each of the series is carried out with a commercial AM1 alloy having its silicon content adjusted to the indicated values. Heat treatments in each series. The results given are the ultimate values from the series of tests.
• the metal employed is of the following composition:
• the metal is of the following composition:
• the cast plate is heat treated for 36 hours at 600 C. and is then roughly shaped at 500 C. without intermediate cooling. It is hammer-hardened cold by and it then receives the final tempering treatment in a moving furnace.
• the conditions of conversion are as follows: rough shaping at 520 C. with or without intermediate cooling; hammer-hardening by 100% and 150%, and tempering in a stationary furnace.
• the alloy is homogenized for 36 hours at 600 C., rough shaped while hot until it is reduced to 5.5 mm. thickness, and cold rolled to a 25/10 mm. reduction. It is then subjected to an intermediate tempering treatment after which it is rolled to 12/10 mm. before receiving the final tempering treatment.
• the sheets obtained give rise to mandrel forming horns of the order of 3.5% whereas, without the improvements provided by the process of this invention, the horns are generally of 7%.
• a method in accordance with claim 1 wherein a cold hammer-hardening operation is conducted after formation of said sheets, and wherein the sheets are subjected to a tempering heat treatment as a final processing step.

Landscapes

• Chemical & Material Sciences (AREA)
• Mechanical Engineering (AREA)
• Organic Chemistry (AREA)
• Metallurgy (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Crystallography & Structural Chemistry (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Metal Rolling (AREA)
• Heat Treatment Of Articles (AREA)
• Lead Frames For Integrated Circuits (AREA)
• Conductive Materials (AREA)
• Shaping Metal By Deep-Drawing, Or The Like (AREA)

Applications Claiming Priority (1)

Publications (1)

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Family Applications (1)

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Cited By (2)

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Citations (3)

• 1963
  • 1963-02-14 FR FR924834A patent/FR1357120A/fr not_active Expired
• 1964
  • 1964-02-13 NL NL6401282A patent/NL6401282A/xx unknown
  • 1964-02-13 US US344533A patent/US3341368A/en not_active Expired - Lifetime
  • 1964-02-14 DE DE19641458550 patent/DE1458550B2/de active Pending
  • 1964-02-14 BE BE643808D patent/BE643808A/xx unknown
  • 1964-02-14 GB GB6287/64A patent/GB1062731A/en not_active Expired

Patent Citations (3)

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