Abstract: A process for producing a chassis for vehicles, which includes the steps of fabricating a single frame element of aluminum alloy, the frame element having an upper beam, a lower beam and a web portion connecting between the two beams, removing some of the web portion to a desired length, pulling the upper beam and lower beam of the web vacant portion in opposite directions so that the web vacant portion becomes an expanded opening, bending the frame element in accordance with the size and shape of the body of a vehicle to be placed on the chassis, and welding the terminating ends of the frame element to form an endless frame.

Abstract: A photosensitive drum adapted for use in electronic copying machines and laser beam printers, the drum made of aluminum-based alloy and supporting a photosensitive recepter thereon, the aluminum-based alloy having a composition consisting essentially of 0.5 to 8.0% of Ni, and preferably, one or more additives selected from a group of 0.05 to 1.5% of Mn, 0.05 to 1.0% of Cr, 0.05 to 0.5% of Zr, 0.5% or less of Ti, 0.1% or less of B, 0.05 to 7.0% of Cu, 0.05 to 7.0% of Mg, 0.05 to 8.0% of Zn, 0.05 to 12.0% of Si, and 0.05 to 2.0% of Fe, and the balance being substantially aluminum.

Abstract: A method for producing corrosion resistance heat exchangers having a plurality of aluminum tubular elements and fin members, the method comprising immersing the tubular elements in a bath with passing an electric current so that the surfaces thereof are covered with zinc layers of 0.3 .mu.m or more in thickness; combining the zinc plated tubular elements with fin members covered with a brazing sheet so that a core is provisionally formed; painting the provisional core with a non-corrosive flux; and placing the provisional core in a furnace to braze the fin members to the tubular elements, and also to enable the zinc layers to diffuse over the surfaces of the tubular elements.

Abstract: A condenser adapted for use in the car cooling system, the condenser comprising a pair of headers provided in parallel with each other; a plurality of tubular elements whose opposite ends are connected to the headers; fins provided in the air paths between one tube and the next; wherein each of the headers is made of a cylindrical pipe of aluminum; wherein each of the tubular elements is made of a flat hollow tube of aluminum by extrusion; and wherein the opposite ends of the tubular elements are inserted into slits produced in the headers os that they are liquid-tightly soldered therein.

Abstract: An aluminum-based alloy foil for use as negative electrodes of elecrolytic capacitors, the foil containing 0.1 to 1.0% of Cu, 0.01 to 1.0% of Ni, 0.002 to 0.05% of Ti, and optionally 0.0005 to 0.02% of B, wherein the balance is substantially aluminum.

Abstract: A stack type heat exchanger which comprises a plurality of tubular elements including a tank section at least at one end, the tubular elements being adapted to allow a heat exchange medium to pass through; a plurality of air paths interposed between one tubular element and the next, each of the air paths being provided with a fin member; wherein each tubular element comprises a pair of metal tray members jointed at their peripheries with an inner plate interposed therebetween; wherein each inner plate is provided with projections on its top surfaces and undersurface so that the flows of the medium are blocked by the projections so as to enlarge the effective area for heat transfer between the medium and the tubular element.

Abstract: A method for producing aluminum drums having highly smooth surfaces, the method including two steps; the preparation of an aluminum pipe by extrusion, and the drawing of the pipe through a die unit, wherein the die unit comprises a die and a plug, the die having an approach angle of 45.degree. to 75.degree. C. and the plug having an approach angle of 10.degree. to 20.degree..

Abstract: An aluminum capacitor plate for use in an electrolytic capacitor, the capacitor plate including a sponge-like layer in its surfacial portion, the layer including a plurality of projections projecting inward and outward, the projections individually having heights of not higher than 1 .mu.m on average; and a titanium film having accumulated titanium particles each including projections having heights of not higher than 1 .mu.m, wherein the titanium particles are unevenly distributed in the film with a number of pores interposed therebetween.

Abstract: An aluminum matrix composite containing evenly dispersed reinforcement particles in the aluminum matrix wherein the contents of oxygen and carbon are controlled so that their volume percentage is not larger than 20% and wherein the contents of the reinforcement particles, oxygen and carbon are controlled so that their volume percentage is not larger than 40%. The control of oxygen and carbon is effected by carrying out the main process at a non-oxidizing atmosphere and minimizing the addition of an anti-seizure agent required to facilitate the mechanical alloying treatment.

Abstract: An extruded aluminum alloy improved especially in wear resistance and cuttability and comprising 12 to 30% of Si and 0.3 to 7.0% of Cu, with or without 0.3 to 2.0% of Mg, the balance being substantially aluminum. In this alloy, primary Si crystals 40 to 80 microns in particle size occupy at least 60% of the area occupied by all the primary Si crystals in the aluminum matrix, and eutectic Si crystals up to 10 microns in particle size occupy at least 60% of the area occupied by all the eutectic Si crystals in the matrix. The primary and eutectic Si crystals are uniformly dispersed throughout the matrix. A process for preparing the extruded aluminum alloy is also disclosed.

Abstract: A heat releasing device comprising a heat transmitting block having a heat source attaching portion and a bore extending therethrough, a looped heat pipe having at least one pair of straight tubular portions, the first of the straight tubular portions being intimately fitted in the bore, and a multiplicity of radiating fins attached to the heat pipe.

Abstract: An evaporator is provided having a core portion with an inlet and an outlet; a fluid path for allowing a cooling fluid to pass through, the path being formed in a zigzag form so that the fluid passes through the core portion at least three times; and the fluid path having an increasingly large cross-sectional area from the inlet toward the outlet.

Abstract: An aluminum alloy having excellent properties including extrusibility, forgeability and malleability, the alloy containing 4.0 to 12% of zinc, 0.3 to 5.0% of magnesium, and one or more elements selected from the rare earth elements, wherein the content of the selected element is in the range of 0.5 to 10.0%, and the balance being substantially aluminum and unavoidable impurities.

Abstract: A process for treating the surface of aluminum foil for use as an electrode of electrolytic capacitors to increase the surface area of the foil to the greatest possible extent includes the three steps of pre-etching treatment, intermediate nitric acid treatment and post-etching treatment. The pre-etching treatment is conducted electrolytically in an aqueous solution of chromic acid and at least one of chromic acid and chromates. The intermediate nitric acid treatment is carried out by immersing the pre-etched foil in an aqueous solution of nitric acid to remove a chromate film formed by the pre-etching from the foil surface, especially from the interior of the resulting pits. The post-etching treatment is conducted electrolytically in an aqueous solution of hydrochloric acid, or hydrochloric acid and an oxidizing acid.