Abstract:
Strength anisotropy of aluminum-lithium alloy wrought products is reduced by subjecting these types of alloys to improved T8 temper practice. The wrought product, after solution heat treating and quenching, is subjected to a combination of cold rolling and stretching steps prior to aging. The cold rolling can range between 1 and 20 % reduction with the stretching step ranging between 0.5-10 %. The cold rolling step may be performed in one or a multiple of passes. When multiple passes are used, the cold rolling may be done in different directions to further enhance reductions in strength anisotropy for these types of alloys. Table X and Figure 8 summarize the results of inventive practive (D), (E) or (F) on the highest and the lowest (TYS) value and compares it with the conventional practice. The relative closeness of (TYS) by inventive practice suggests commercial exploitation of the wrought Al-Li alloys in high strength applications.
Abstract:
Procédé et appareil de formage d'extrémités de boîtes métalliques dans lesquels des extrémités sont découpées à partir d'une tôle puis formées dans une matrice dans laquelle l'extrémité découpée est formée, et retirée de ladite matrice au niveau d'une position verticale située au-dessous de la position de découpage (226). Le formage et le retrait de l'extrémité au-dessous de la ligne de découpage permettent une meilleure gestion des extrémités après formage. On applique (156) du vide au côté inférieur de l'extrémité (60) afin d'asseoir directement l'extrémité contre des éléments (72, 58) de formage inférieurs de la matrice à mesure que les éléments inférieurs font monter l'extrémité jusqu'au niveau d'une fente d'éjection où de l'air sous-pression (226) expulse l'air se trouvant entre les matrices (54, 56). L'invention concerne également un circuit de lubrification automatique utilisé pour lubrifier correctement des éléments d'étanchéité formant des coussins pneumatiques utilisés pour solliciter de manière souple les divers éléments matriciels.
Abstract:
Alliage à base d'aluminium utile dans des structures aéronautiques et aérospatiales, possédant une faible densité, une résistance élevée et une forte ténacité à la rupture, correspondant essentiellement à la formule CuaLibMgcAgdZreAlba1 dans laquelle a, b, c, d, e et ba1 indiquent le pourcentage en poids des composants d'alliage, lesdits pourcentages étant 2,4
Abstract:
A flanging head (10) assembly having a cluster of freely rotatable spin flanging rollers (12) includes a stop ring (26) against which the flange (68) hits during the final flange forming stages to limit the flange to a specific diameter. To prevent the flange from entering the crack (72) formed between the rotating roller and the stationary stop ring, there is provided a step (80) spacing the stop ring surface (70) from the roller forming surface (66). In this manner, as the terminal edge of the flange (68) slides around the flanging roller during final forming, it will pass over the crack (72) and across the step (80) to lodge in a corner (85) formed between the step and stop ring surface. In a preferred embodiment, the step is a conical surface extending from the stop ring surface in a direction away from the can bottom. This conical surface extends radially inwardly a sufficient distance to contact unsupported flange portions between the flanging rollers to limit the degree of elastic sagging of these portions.
Abstract:
A melt drag metal strip casting system (10) of the type wherein molten metal (20) is delivered from a supply (18) of the molten metal into contact with a chill surface (14) at a casting station and the chill surface (14) is driven for movement in a path past the casting station at a predetermined linear rate to quench and withdraw a continuous strip (16) of metal from the molten metal supply (18), the strip (16) having a bottom surface adhering to the chill surface and an unsolidified top surface as it is withdrawn from the molten metal supply (18), includes a top roll (80) adjustably mounted above the chill surface (14) and spaced therefrom by a distance substantially equal to the thickness of the strip (16) desired with the top roll (80) in contact with the unsolidified top surface of the strip (16), with the temperature of the top roll surface (90) in contact with the unsolidified top surface of the strip (16) being maintained at a level which will not solidify the top surface of the metal being cast.
Abstract:
An apparatus is disclosed for regulating a liquefied gas input stream for temperature and pressure. The apparatus produces a pressurized head of liquefied gas while removing gaseous material to produce a constant temperature and pressure liquefied gas exit stream. The apparatus comprises a chamber (15) having an inlet (12) for liquid gas and a gas exhaust 30, toward the upper end of the chamber and a column (22) opening from the lower end of the chamber, the lower end of the column being in communication with an outlet (26) and with the lower end of a tube (28) which surrounds the column and opens into the lower end of the chamber. The chamber is provided with a float (18) which controls the liquid level within the chamber.
Abstract:
A resealable closure device for use on metallic cans comprises a metallic end (2) with an opening therein surrounded by an outwardly flared flange (18), and a molded rubber or plastic element (4) having a skirt portion (32), which is molded in an "inverted umbrella" position and which is capable of being inverted upon itself to seal onto the end.
Abstract:
In a carbothermic process for producing aluminum, alumina and carbon are reacted in a furnace to produce aluminum contaminated with aluminum carbide. A charge material (28) including carbon is subjected to back reactions of vapors and gases passing upwardly therethrough and is transferred to the hearth (13) of the furnace (10) where it reacts with a molten slag layer (23) containing alumina to produce an aluminum product as a separate liquid layer (25). At least part of the alumina necessary to form the aluminum product may be supplied to the hearth without being subjected to the back reactions, for example by being transferred with slag (38) from a secondary decarbonizing furnace (30) to which alumina is directly fed. The reduction reaction on the hearth (13) may result in an aluminum product having a carbide content of 20 - 37%, which can be reduced to 4 - 15% in a subsequent reaction on the same hearth in the absence of both reactive carbon and of solid aluminum carbide, and still further to about 2% in the secondary furnace (30).
Abstract:
Un procede de reconstitution de gaz NOX en acide nitrique comprend les etapes suivantes: 1) les gaz sont mis au contact, a contre-courant, dans une ou plusieurs colonnes remplies de 50 a 60% d'acide nitrique refroidi pour extraire sous forme d'acide nitrique la plus grande partie des valeurs NOX introduites initialement et obtenir une solution acide sortant de la colonne ayant une temperature inferieure a 180 F environ; 2) les gaz residuels provenant de l'etape (1) sont comprimes entre 2 et 6 atmospheres absolus environ; et 3) les gaz comprimes de l'etape 2 sont mis en contact avec 50 a 60% environ d'acide nitrique dans une colonne d'absorption a contre-courant pour extraire sensiblement toutes les valeurs NOX restantes provenant du courant gazeux.
Abstract:
One free machining aluminum alloy includes bismuth as a free machining elemental constituent that functions as a discontinuity in the aluminum alloy matrix rather than a low melting point compound. Using bismuth in weight percents of the total composition ranging between 0.1 % and 3.0 % improves both machinability and mechanical properties. The bismuth can act as a substitute for another free machining constituent in a free machining aluminum alloy or can be added to an aluminum alloy to improve its machinability. Another free machining aluminum alloy has bismuth and tin as free machining constituents for improved machining. When using bismuth and tin, the bismuth ranges between 0.1 and 3.0 % by weight and the tin ranges between 0.1 and 1.5 % by weight.