Abstract: The present invention provides a high strength aluminum alloy suitable for use in the manufacture of a fin, said aluminum alloy containing at most 0.1% by weight of Si, 0.10 to 1.0% by weight of Fe, 0.1 to 0.50% by weight of Mn, 0.01 to 0.15% by weight of Ti, and the balance of Al and unavoidable impurities, intermetallic compounds having a diameter not larger than 0.1 .mu.m being distributed within the metal texture of the alloy in a number density of at least 10/.mu.m.sup.3. The present invention also provides a method of manufacturing a high strength aluminum alloy suitable for use in the manufacture of a fin, comprising the steps of heating to 430.degree. to 580.degree. C. an aluminum alloy ingot of the composition noted above, applying a hot rolling treatment to said aluminum alloy ingot to obtain a plate material before the temperature of the aluminum alloy ingot is lowered by at most 50.degree. C.

Abstract: A surface-treated aluminum material comprising an aluminum or aluminum alloy substrate, a chromate film deposited on the substrate, and an organic resin mixture film deposited on the chromate film is provided. The chromate film is deposited to a coating weight of from 5 to 100 mg/m.sup.2 calculated in terms of elementary chromium on the aluminum substrate. The organic resin mixture film is deposited to a dry film thickness of from 0.05 to 3.0 .mu.m, and comprises (a) 100 parts by weight of an organic resin, (b) 0.5 to 40 parts by weight of a powder lubricant having an average particle size of from 0.05 to 20 .mu.m, said average particle size being in the range of from 1.0 to 10 folds of the dry film thickness, and (c) 1.0 to 40 parts by weight of electroconductive finely divided particles having an average particle size in the range of from 0.05 to 5 .mu.m, said average particle size being in the range of from 1.0 to 2 folds of the dry film thickness.

Abstract: A method of producing an aluminum alloy heat-exchanger is disclosed, wherein, upon producing an aluminum alloy heat-exchanger by soldering technique, it is retained for 10 minutes to 30 hours at 400.degree. to 500.degree. C. after finishing a heating for soldering. It is better to retain the heat-exchanger during cooling. Alternatively, the heat-exchanger may be cooled to 150.degree. C. or lower and reheated to 400.degree. to 500.degree. C. for at least 10 minutes to up to 30 hours. Furthermore it is preferable to cool at a cooling velocity of not slower than 30.degree. C./min across a temperature range from about 200.degree. C. to about 400.degree. C. after the retainment. Excellent thermal efficiency, high strength and excellent corrosion resistance can be achieved this way.

Abstract: A lightweight V-grooved pulley obtained from a metal plate and having a cylindrical member with one open end, the cylindrical member having a circumferential surface formed with at least one groove having a substantially V-shaped section is provided in which the material of the metal plate consists of an aluminum alloy containing 2 to 6 wt% of Mg, at least one of 0.005 to 0.2 wt % of Ti, and 0.0005 to 0.02 wt % of B, impurities containing not more than 0.2 wt % of Si, not more than 0.2 wt % of Fe, and not more than 0.5 wt % of Zn, and a balance consisting of Al and an inevitable impurity, and an anodized film is formed on a region including the groove. The material of the metal plate may additionally contain at least one element selected from the group consisting of 0.01 to 2.0 wt % of Cu, 0.02 to 1.0 wt % of Cr, and 0.01 to 0.3 wt % of Zr.

Abstract: An Al alloy extrusion material for the fuel-distributing pipe of automobile, consisting essentially of 0.3 to 1.0 wt. % of Si, 0.1 to 0.5 wt. % of Cu, 0.6 to 1.5 wt. % of Mg, 0.3 to 1.0 wt. % of Sn, 0.005 to 0.03 wt. % of Ti and the balance of Al and inevitable impurities and having uniformly dispersed Sn compounds with particle diameter of not more than 20 .mu.m and density of 20 to 700 grains/mm.sup.2 in the section perpendicular to the extrusion direction of material is disclosed, which is excellent in the chip separation property and the precision of cut face on cutting.

Abstract: A rolling mill comprising an actuator for controlling shapes or conditions of work roll surfaces during rolling and a flatness meter for detecting broadwise flatness of rolled strip to generate an output signal whereby the actuator is operated so as to control the flatness of strip, the output signal being analyzed into a plurality of evaluation indexes. Each of the evaluation indexes is converted by a membership function into a fuzzy quantity having one of a predetermined number of values. These fuzzy quantities are subjected to fuzzy reasoning consisting of a plurality of control rules to set the control value of the actuator.

Abstract: A brazing sheet having an Al alloy core material one or each of whose surfaces is clad with a brazing material, the brazing sheet being excellent in vacuum brazing ability suitable for the manufacture of aluminum heat exchangers that have a hollow structure. The brazing material is an Al--Mg--Si alloy brazing material comprising 0.6 to 1.8 wt % of Mg, 6.0 to 20.0 wt % of Si, and the balance of Al and inevitable impurities, and having, in its metal texture, 1,000/mm.sup.2 or more Mg.sub.2 Si particles 2 to 5 .mu.m in diameter, with the particles being assumed to be spheres, and 3,000/mm.sup.2 or more Si particles 6 .mu.m or less in diameter, with the particles being assumed to be spheres.

Abstract: The present invention relates to an aluminum alloy for fins of heat exchangers such as of automobile radiators and evaporators comprising 0.3 to 1.0% by weight of silicon, 0.3 to 3.0% by weight of iron, and the balance of aluminum and unavoidable impurities, which is readily workable for a fin (or readily corrugated), and is less deformed by brazing heat, and yet has improved thermal conductivity after the brazing.

Abstract: This invention discloses a width-variable mold device to be used by placing a feed device for moving minor side members toward a movable direction and by varying steplessly the width of the mold within a certain range by means of the operation of the feed device, in a mold device formed in an approximately rectangular shape by both two mutually opposed major side members having slightly curved opposed surfaces so that their opposed interval may reach its maximum at the center portion and its minimum at both ends and two opposed minor side members bringing both side ends into contact with the opposed surfaces of the major side members and placing between the major side members, wherein the major side members and the minor side members are equipped with their water cooled jackets at their outside, each of the major side members is suspended and supported to the support tables at both sides so as to move each of the major side members toward the direction where their opposed interval varies, and at the same time

Abstract: A method of producing an aluminum tube covered by a layer of zinc using a continuous cold forming machine which includes the steps of: providing an extrusion die having a heating device and an inert gas-blowing tube to the cold forming machine, introducing an aluminum prime wire to the cold forming machine, extruding the prime wire through the extrusion die to form an aluminum tube while heating the die to a high temperature and blowing an inert gas across the die toward the tube to provide a high-temperature, non-oxidized aluminum tube, and flame spraying zinc powder onto the outer non-oxidized surface of the tube to cover the surface and provide an anticorrosive layer of zinc on the aluminum tube.

Abstract: An aluminum alloy for magnetic disc substrate excellent in platability is disclosed, which is characterized in that not less than 0.010 wt. % and under 0.03 wt. % of Cu, not less than 2 wt. % and not more than 6 wt. % of Mg and not less than 0.05 wt. % and not more than 2.0 wt. % of Zn are contained, further one or more of over 0.01 wt. % and under 0.05 wt. % of Mn and over 0.01 wt. % and under 0.05 wt. % of Cr are contained, and, as impurity elements, Si, Fe, Ti and other individual unavoidable element are regulated to be not more than 0.1 wt. %, not more than 0.1 wt. %, not more than 0.02 wt. % and not more than 0.02 wt. %, respectively. Zr may be contained additionally in amounts of not less than 0.005 wt. % and under 0.05 wt. %.

Abstract: A tubular material drawing apparatus for manufacturing precision tubes comprises a plug set device, provided to a back bench, for holding a plug rod in a horizontal state, a travel base to be movable backward with respect to the back bench in a horizontal direction, a holding mechanism, provided to the travel base and capable of holding a rear end portion of a tube element, for holding the rear end portion of the tube element and moving the tube element in a horizontal direction to fit the tube element on the plug rod upon movement of the travel base, a clamp, movably provided to the travel base in a horizontal direction, holding the rear end portion of the tube element and then bringing the rear end portion to the holding mechanism, a carriage guide horizontally extending, a carriage which is guided by the carriage guide and is movable forward, die provided between the back bench and the carriage, and a chuck portion, provided to the carriage and capable of holding a front end portion of the tube element.

Abstract: A method of manufacturing extruded seamless hollow materials characterized in that, prior to extruding a hollow billet from container liner through extrusion dies, a process wherein a centering jig for holding the tip portion of mandrel at the center of extrusion is provided on the extruding side or in the extrusion dies on the extruding side of the container liner, a process wherein the tip portion of mandrel is inserted into the centering jig to be held and a process wherein the hollow billet is pressurized to fill up said billet in the container liner are included.

Abstract: A method of manufacturing heat-exchanger excellent in the pitting corrosion resistance is disclosed, wherein, in the manufacture of aluminum heat-exchanger to be brazed under heat in the furnace of inert gas atmosphere using fluoride flux, Zn is disposed at a position of 430.degree. to 620.degree. C. in the furnace to melt and vaporize it and the vapor of Zn is allowed to contact with the fin material and the tube material coated with said flux simultaneously with the brazing under heat of these aluminum components, or the fin material coated with said flux and dried and the tube material without flux are assembled and retained for not less than 1 minute in the vapor of Zn of a temperature lower than the melting point of said flux and higher than the temperature, at which these components are heated, in the inert gas and thereafter brazing is performed at a temperature higher than the melting point of said flux.

Abstract: Aluminum thin plates which are used as fins of a heat exchanger can be manufactured, as described in the claims, by controlling the composition of an aluminum alloy, which is used as a core material, and controlling the cold rolling reduction ratio of a clad material composed of the core material and a skin material, after hot rolling. The thus manufactured aluminum thin plates for brazing are excellent in high-temperature sagging resistance and sacrificial anodic effect, whereby it is possible to make the fins thinner.

Abstract: A substrate including a disk having a pair of opposed faces and being coined to provide a sub-micron flatness and smoothness for the disk faces. The coined disk can then be coated with a layer of storage material and used as a storage medium. Apparatus and a method for forming the coined substrate includes means for moving a plurality of disks along a predetermined path after the disks have been formed by blanking or stamping. The disks are cleaned before being coined and then stacked into containers which can be closed for transit to a point of use. The coining of the disks and the placement of the disks in containers is done under clean room conditions and the resulting coined substrates are free of flaws and defects encountered with the practice of conventional substrate forming techniques.

Abstract: A method and apparatus utilizing a core is located at a central portion of a molten metal storing portion in a vertical semi-continuous mold. The molten metal is poured into the molten metal storing portion, and casting takes place with the inner diameter of a solidified distal portion of the molten metal being controlled by a distal portion of the core. This approach provides a reliable method for the manufacture of high-quality hollow billets which are free from internal defects.

Abstract: A substrate including a disk having a pair of opposed faces and being coined to provide a sub-micron flatness and smoothness for the disk faces. The coined disk can then be coated with a layer of storage material and used as a storage medium. Apparatus and a method for forming the coined substrate includes means for moving a plurality of disks along a predetermined path after the disks have been formed by blanking or stamping. The disks are cleaned before being coined and then stacked into containers which can be closed for transit to a point of use. The coining of the disks and the placement of the disks in containers is done under clean room conditions and the resulting coined substrates are free of flaws and defects encountered with the practice of conventional substrate forming techniques.

Abstract: A tubular material drawing apparatus for manufacturing precision tubes comprises a plug set device, provided to a back bench, for holding a plug rod in a horizontal state, a travel base to be movable backward with respect to the back bench in a horizontal direction, a holding mechanism, provided to the travel base and capable of holding a rear end portion of a tube element, for holding the rear end portion of the tube element and moving the tube element in a horizontal direction to fit the tube element on the plug rod upon movement of the travel base, a clamp, movably provided to the travel base in a horizontal direction, holding the rear end portion of the tube element and then bringing the rear end portion to the holding mechanism, a carriage guide horizontally extending, a carriage which is guided by the carriage guide and is movable forward, die provided between the back bench and the carriage, and a chuck portion, provided to the carriage and capable of holding a front end portion of the tube element.

Abstract: A method of manufacturing extruded flat multihole aluminum tube for heat exchangers is disclosed, which is characterized in that, in the hot extrusion of flat multihole Al-Cu or Al-Cu-Mn tubes, a plurality of tubes are extruded side by side in the longitudinal direction and Zn is flame sprayed onto both even surfaces of the tubes in the vicinity of the extrusion exit of the tubes to cover both even surfaces of the extruded tubes with Zn. The covering level of Zn is 3 to 30 g/m.sup.2.