Abstract: A brazing sheet comprises a thin covering material and a core material as well as an Al—Si alloy brazing material inserted between the thin covering material and the core material. The brazing material further contains Mg, Bi and/or Zn, Sn, In. When the above brazing material is molten in an inert gas atmosphere, this molten brazing material seeps onto the surface of the above thin covering material, whereby the brazing sheet is fluxlessly brazed to joint materials.

Abstract: A continuous vacuum refining method of molten metals, wherein impurities in the molten metal are eliminated by evaporation by stirring the molten metal (1) in the molten liquid stirring part B in the evacuated and pre-heated vacuum chamber, the molten liquid is transferred from the stirring part B to the tapping part C in the chamber through connecting holes, the molten liquid is continuously guided into the vessel in the refined molten liquid recovery chambers (10a), (10b) through the recovery passageways (8a), (8b) connected to the tapping part C, the recovery chamber being evacuated and connected with the passageway, and the refined molten liquid (9) is recovered after returning the pressure to the atmospheric pressure, wherein the molten liquid is discharged using plural passageways and plural recovery chambers connected with the respective passageways with alternating the recovery chamber. An apparatus employed for this method.

Abstract: The present invention disclosed is an aluminum alloy plate for super plastic molding capable of cold pre-molding before super plastic molding. The alloy plate comprises Mg at from 2.0 to 8.0% (weight %, the same shall apply hereinafter) Be at from 0.0001 to 0.01%, at least one of Mn at from 0.3 to 2.5%, Cr at from 0.1 to 0.5%, Zr at from 0.1 to 0.5% and V at from 0.1 to 0.5%. Additionally, the alloy plate may comprise an Fe amount and an Si amount each within a range of 0.0 to 0.2%; amounts of Na and Ca within ranges of 3 ppm or less and 5 ppm or less, respectively; while the remainder of the alloy plate consists of Al and inevitable impurities. The resulting alloy plate a crystalline structure is a non-recrystallized crystal structure; the 90° critical bending radius is 7.5 times the plate thickness or less; and the yield strength ratio before and after the final annealing is 70% or more. The invention also discloses production methods for the alloy plate.

Abstract: An aluminum-alloy rolled sheet is cold preformed and then superplastically formed by: providing a composition which consists of from 2.0 to 8.0% of Mg, from 0.0001 to 0.01% of Be, and at least one element selected from the group consisting of from 0.3 to 2.5% of Mn, from 0.1 to 0.5% of Cr, from 0.1 to 0.5% of Zr, and from 0.1 to 0.5% of V, less than 0.2% of Fe as impurities, as well as aluminum and unavoidable impurities in balance; providing an unrecrystallized structure formed by annealing at a temperature of from 150.degree. to 240.degree. C. for 0.5 to 12 hours or at a temperature of from 250.degree. to 340.degree. C. for 0 to 5 minutes; providing draft of final cold-rolling amounting to 50% or more; and, providing 7% or more of elongation at normal temperature.

Abstract: Provided is a superplastic forming aluminum alloy in rolled form which exhibits superplasticity and has improved corrosion resistance, weldability, and strength and fatigue property after superplastic forming, eliminating a need for heat treatment after superplastic forming. Preferred alloys have an excellent outer appearance of grey to black color after anodization. The alloy consists essentially of, in % by weight, 2.0-8.0% of Mg, 0.3-1.5% of Mn, 0.0001-0.01% of Be, an optional element selected from C, V, and Zr, an optional grain refining agent of Ti or Ti and B, less than 0.2% of Fe and less than 0.1% of Si as impurities, and the balance of Al, wherein intermetallic compounds have a size of up to 20 .mu.m, and the content of hydrogen present is up to 0.35 cc/100 grams. Particularly when a minor amount of Ti or Ti and B grain refining agent is contained, Mn precipitates have a size of 0.05 .mu.m or larger, and the Si content in entire precipitates is less than 0.

Abstract: In an apparatus for cutting a metal sheet, a pair of hollow shafts are mounted in a housing for angular movement relative thereto. The hollow shafts have respective hollow bores whose respective axes are eccentric to the axes of the respective hollow shafts. A pair of holder shafts are rotatably fitted respectively in the hollow bores. A pair of circular cutting blades are mounted respectively on projecting forward ends of the respective holder shafts in concentric relation thereto for rotation with the respective hollow shafts. When the holder shafts are rotated to rotate the cutter blades, the cutter blades cooperate with each other to cut a metal sheet caused to pass between the cutter blades. An interlocking unit is arranged between the hollow shafts, for enabling the hollow shafts to be moved angularly about their respective axes in an interlocking fashion, thereby moving the axes of the respective holder shafts toward and away from each other to adjust an amount of lap between the cutting blades.

Abstract: A printing aluminum alloy material plate is described which provides good printing characteristics, that is, surface-treatment ability, burning ability and ink stain resistivity; the plate is obtained from an aluminum alloy material which is cold-rolled at a reduction rate of from 20 to 95% after being subjected to intermediate annealing at a temperature of 300.degree. to 550.degree. C. wherein the aluminum alloy material comprises 0.25 wt % or less Si, from 0.05 to 1.0 wt % Fe, 0.03 wt % or less Cu, 0.10 wt % or less Ti, and 0.03 wt % or less Mg and the balance of unavoidable impurities and Al.

Abstract: A T4 tempered and straightened rolled sheet of the Al--Mg--Cu series aluminum-alloy which contains from 1.5 to 5.5% of Mg and from 0.18 to 1.5% of Cu as the essential alloying element, has excellent mechanical properties, an improved formability, of a non-generation of Luder's marks. After the T4 treatment and subsequent straightening, the sheet is subjected to heating to a temperature in the range of from 60.degree. to 360.degree. C., at a heating rate falling within the hatched region of FIG. 1 attached herewith, then holding within the hatched region of FIG. 2 attached herewith, and subsequently, cooling at a cooling rate falling within the hatched region of FIG. 1.

Abstract: Herein disclosed are the ingredient and composition of a wrought material of an aluminum alloy to be anodized into a dense gray color for facing buildings, and a process for making the wrought aluminum alloy material. This material consists essentially of 0.4 to 1.0% of Fe, 0.05 to 0.25% of Si, 0.3 to 1.5% of Mg, 0.05 to 0.7% of Mn (<Fe in percentage), 0.10% or less of Ti, and 0.003% of B, if necessary, in weight ratio, the remainder being Al and irreversible impurities. According to the process for making the wrought material, an alloy having the above-specified ingredient and composition is direct chill cast, and the cast ingot is heated at 350.degree. to 580.degree. C. for 0.5 to 12 hours and is then hot worked.