Abstract:
A melt drag metal strip casting system of the type wherein molten metal (20) is delivered from a supply (18) of the molten metal into contact with a grooved chill surface (14) and the chill surface (14) is driven at a predetermined linear rate to quench and withdraw a continuous strip of metal (16). The strip (16) having a bottom surface adhering to the chill surface (14) and an unsolidified top surface as it is withdrawn from the molten metal supply, including a top roll (80) adjustably mounted above the chill surface (14) and spaced therefrom by a distance substantially equal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 only with the unsolidified top surface of the strip (16), with the temperature of the top roll (80) surface in contact with the unsolidified top surface of the strip being maintained at a level which will not solidify the top surface of the metal being cast.
Abstract:
An improved method of and apparatus is disclosed for direct casting of molten metal to form a strip by solidification of the molten metal on a moving chill surface (12) using the vessel having a floor (30), space sidewalls (32, 34), an inlet (20) and an outlet (18) extending between the sidewalls (32, 34) for supplying the molten metal to the chill surface (12) in which the transverse dimension of the outlet may be adjusted during casting to change the width of the strip by central baffle (44) and preferably adjustable baffles (106, 108) to control the flow pattern to provide a substantially uniform flow of metal to the outlet.
Abstract:
A process for preparing an ultra-white alumina trihydrate having a G.E. brightness of at least about 98 %. The product is alumina trihydrate that has been rehydrated with coprecipitation, and the crystal phase of the product is primarily gibbsite in thin platelet form having a ratio of thickness to diameter of about 0.2 to about 0.3. The product is prepared by flash activation of a white initial alumina trihydrate, addition of the activated material to a purified sodium aluminate liquor having an alumina to caustic ratio of about 0.5, and rehydrating and precipitating the alumina at ambient temperature under agitation for about 48 hours, followed by washing and drying of the resulting precipitate. The material is especially useful as a filler or coating in papermaking, and it can be substituted for a portion of titanium dioxide pigment in the ratio of 1:1, and can be combined with titanium dioxide as a pigment mixture, either in slurry form or in dry form. The pigment mixture is added to the papermill machine chest to enhance optical properties beyond those achieved by either pigment alone.
Abstract:
A method for improving the surface quality of electromagnetically cast aluminum alloy ingot (15) includes the addition of an effective amount of calcium prior to the ingot head (19) of an ingot mold (30) of an electromagnetic casting station (7). The addition of calcium is regulated such that the aluminum alloy cast ingot (15) contains a maximum of 0.05 weight percent calcium. Addition of the calcium prior to the ingot head (19) produces a cast ingot (15) which is generally free of surface imperfections (21) on side surfaces thereof so that the cast ingot (15) can be directly worked or rolled to a desired gauge without a scalping (29) or other surface conditioning treatment. The calcium can be added during melting, alloying, filtering, degassing or transferring of the molten aluminum prior to casting. An electromagnetically cast aluminum alloy ingot (15) is produced, preferably an AA 5182 can end stock alloy, which is essentially free of surface imperfections (21) to permit direct rolling or other working of the cast ingot without a surface conditioning treatment.
Abstract:
Casting aluminum-lithium based alloys under a salt cover (25) involves forming a molten aluminum-lithium alloy, transferring the molten aluminum-lithium alloy to a casting station (3), and direct chill casting the aluminum-lithium alloy, wherein a protective molten salt cover (25) comprising a mixture of lithium chloride and potassium chloride is maintained over the aluminum-lithium alloy (23) during the casting process. Formation of the molten aluminum-lithium alloy includes alloying of lithium with aluminum by adding lithium to the salt-covered molten aluminum in a melting vessel (1). The molten salt may be added to the ingot head during casting. A preferred salt mixture includes 35 to 90 mole % LiCl and 10 to 65 mole % KCl.
Abstract:
An aluminum-based alloy composition having improved combinations of strength and fracture toughness consists essentially of 2.5-5.5 percent copper, 0.10-2.30 percent magnesium, with minor amounts of grain refining elements, dispersoid additions and impurities and the balance aluminum. The amounts of copper and magnesium are controlled such that the solid solubility limit for these elements in aluminum is not exceeded. The figure illustrates the broad composition ranges for (A, B, and C) including specific alloy samples 2 through 5 as exemplary inventive alloy. The dotted line shows the preferred alloy composition. The inventive alloy composition may also include 0.10-1.00 percent silver for improved mechanical properties. The alloys are useful as for aircraft and aerospace structure parts.
Abstract:
An aluminum-based alloy composition having improved corrosion resistance and high extrudability consists essentially of about 0.1-0.5 % by weight of manganese, about 0.05-0.12 % by weight of silicon, about 0.01-0.20 % by weight of titanium, about 0.15-0.25 % by weight of iron and the balance aluminum, wherein the aluminum alloy is essentially copper free. The inventive alloy is useful in automotive applications, in particular, heat exchanger tubing and finstock, and foil packaging. The process provided by the invention uses a high extrusion ratio and produces a product having high corrosion resistance.
Abstract:
A slide cutter assembly (10) for use in sectioning lengths of a packaging material drawn from a roll (12). The device includes an elongated and shaped body (24). A first roll supporting portion (50) is located at a first end of said body (14) and a second roll supporting portion (52) is likewise located at a second end of the body (16). A cutter assembly (10) extends from a selected lengthwise extending edge of the body (82) and upon which an unwound length of the packaging material comes into contact. The cutter assembly (10) incorporates a traversable blade with edges (116, 118) for sectioning from the roll the length of packaging material. The roll of packaging typically comes in a generally elongated and three-dimensional shaped packaging, the cutter device being constructed so that it may be supported within an interior defined by the packaging and upon first mounting the roll between the first and second roll supporting portions (50, 52).
Abstract:
A method of producing an AA7000 series aluminum alloy wrought product or plate includes a two step solution heat treating sequence wherein the aluminum plate is subjected to a first solution heat treatment at a first elevated temperature or temperatures for a first period of time, followed by a second solution heat treatment at a lower temperature or temperatures for a second period of time. The two step solution heat treating sequence results in vastly improved exfoliation corrosion resistance in the final aluminum wrought or plate product. An improved process for making aluminum alloy products in the T7751 Temper also is disclosed.
Abstract:
A high-pressure, plunger-type liquid pump (10) including a liquidmanifold (16) that includes a plunger chamber in the form of an axial cylindrical bore portion (24) for slidably receiving a pressurizing plunger (20), and that also includes a valve chamber (42) coaxial with the plunger chamber (24) and in communication therewith for removably receiving a cartridge-type flow control valve (72, 161). The liquid manifold (16) includes a closure plug (36) to close the valve chamber (42). The cartridge-type valve (72, 161) is slidably received in the valve chamber (42) for enabling removal of the cartridge-type valve (72, 161) from the liquid manifold (16) without the need for separating the liquid manifold (16) from the pump drive housing (12). The cartridge-type valve (72, 161) is of a structure that includes in-line, axially spaced suction (100, 176) and discharge (136, 162) valves that are each spring biased into closed positions. High-pressure liquid is confined within a valve housing body (72, 160) that contains the suction and discharge valves, to minimize damage to the liquid manifold (16) as a result of pressure fluctuations and high-pressure flows. The cartridge-type valve (72, 161) is removable from the manifold (16) without the necessity of removing or even separating the manifold (16) from the pump drive housing (12).