Abstract: An extrusion die is provided to improve wear resistance and to suppress damage to the shaping section of the core die. The core die consists of a plurality of individually prepared protruding rod members 5 that includes a protrusion section 3a and a base section 3b that extends in the upstream direction with respect to the metal flow. The protruding rod members 5 are arranged in parallel in locating grooves 12 fabricated on the male die assembly 2. Each protruding rod member 5 has a base section 3b and a transverse locking notch 7 so that a stopper 8 locks all the protruding rod members 5 to prevent them from shifting in the axial direction of the protruding rod member.

Abstract: The present invention relates to an aluminum material to which a surface treatment is performed, and has as its objective the provision of a surface-treated aluminum material that has excellent adhesive properties with organic resin film. The present invention further aims to provide a method for producing the aforementioned. In the present invention's surface-treated aluminum material, a non-porous anodic oxide film is formed to the surface of the aluminum or aluminum alloy. This non-porous anodic oxide film has a thickness in the range of 5˜800 nm, a porosity of 20% or less, and contains in an amount of 50 ppm or more at least one of silicon, phosphorous, boron or carbon as a component. As a result of this structure, the adhesive properties between organic resin film and non-porous anodic oxide film can be increased.

Abstract: The present invention provides an aluminum alloy support body for a presensitized plate in which the uniformity of the grained surface due to electrochemical etching is further improved, and a method of producing the same. The aluminum alloy support body for the presensitized plate according to the present invention has a composition comprising 0.1 to 0.7% by weight of Fe; 0.01 to 0.2% by weight of Si; 0.005 to 1.0% by weight of one or more rare earth elements; and the balance of Al and unavoidable impurities. In the present invention, the aluminum alloy support body may further contain 0.005 to 0.1% by weight of Ni and 0.005 to 0.3% by weight of one or more rare earth elements. One or more elements of Ce, La and Nd can be selected as the rare earth elements.

Abstract: The present invention provides a die casting magnesium alloy having excellent heat resistance and castability, and the alloy of the present invention is a die casting magnesium alloy having excellent heat resistance and castability, comprising 2 to 6% by weight of Al, 0.3 to 2% by weight of Ca, 0.01 to 1% by weight of Sr, 0.1 to 1% by weight of Mn, the balance magnesium and unavoidable impurities. According to the present invention, more excellent effects can be obtained in the composition wherein rare earth elements are added to the composition described above.

Abstract: A metal material characterized in that the material comprises a substrate metal, a film comprising a nickel fluoride layer and formed on the substrate metal, and a film comprising a carbon layer and formed on the film.

Abstract: By using a variable section extrusion die set which includes a die set (24) displaceable in a first direction orthogonal to an extrusion direction of a molding material and in a second direction perpendicular the first direction and adapted to vary an area of an extrusion molding hole (31) through which the molding material is extruded, and a mandrel (27) reciprocally movable in and out of said extrusion molding hole in the extrusion direction and provided on an outer peripheral portion thereof with a tapered portion (27B) which is gradually reduced in outer configurational dimension from one direction of the reciprocally moving direction to the other, said die set being moved to deform the extrusion molding hole (31) while pressing the molding material against said die set (24), and the tapered portion of the mandrel (27) being reciprocally moved in and out of the extrusion molding hole, extrusion molding of a tubular molding is thereby accomplished which varies in outer configurational dimension and inner c

Abstract: The present invention is a brazing composition for brazing a tube made of aluminum or aluminum alloy and a fin made of aluminum or aluminum alloy when manufacturing a heat exchanger such as evaporators, condensers, radiators, etc., comprising a powder of Al--Si--Zn alloy and binder, wherein the content of Zn in the powder of Al--Si--Zn alloy is in a range of 10 to 55 wt %.

Abstract: The present invention is a brazing composition for brazing a tube made of aluminum or aluminum alloy and a fin made of aluminum or aluminum alloy when manufacturing a heat exchanger such as evaporators, condensers, radiators, etc., comprising a powder of Al-Si-Zn alloy and binder, wherein the content of Zn in the powder of Al-Si-Zn alloy is in a range of 10 to 55 wt %.

Abstract: A molded product with a variable cross sectional configuration in the longitudinal direction is subjected to extrusion molding by using a die set for extruding a molding with a variable section in a longitudinal direction, the die set comprising a first die 10 and a second die 11, the first die 10 and the second die 11 being relatively movably disposed along the web shaping-holes 16 and 28 and arranged in order in the extruding direction of a molding material such that a first extrusion hole 14 and a second extrusion hole 30 have web shaping-holes 16 and 28 communicated with each other and a flange portion shaping-hole 15 (27) of one of the dies is situated on the side of a flange portion communication hole 29 (17) of the other die, and relatively moving the first die 10 and the second die 11 while extruding the molding material towards the variable section extrusion die set.

Abstract: A metal material characterized in that the material comprises a substrate metal, a film comprising a nickel fluoride layer and formed on the substrate metal, and a film comprising a carbon layer and formed on the film.

Abstract: A metal material characterized in that the material comprises a substrate metal, a film comprising a nickel fluoride layer and formed on the substrate metal, and a film comprising a carbon layer and formed on the film.

Abstract: A method manufacturing an aluminum alloy sheet comprising preparing an aluminum alloy ingot essentially consisting of 1.5 to 3.5% by weight of Mg, 0.3 to 1.0% by weight of Cu, 0.05 to 0.6% by weight of Si, and a balance of Al, in which the ratio of Mg/Cu is in the range of 2 to 7, homogenizing the ingot in one step or in multiple steps, performed at a temperature within a range of 400 to 580.degree. C., preparing an alloy sheet having a desired sheet thickness by subjecting the ingot to a hot rolling and a cold rolling, subjecting the alloy sheet to heat treatment including heating the sheet up to a range of 500.degree. to 580.degree. C. at a heating rate of 3.degree. C./sec. or more, keeping it for 0 to 60 seconds at the temperature reached, and cooling it to 100.degree. C. or less at a looking rate of 2.degree. C./sec. or more, and keeping the alloy sheet at a temperature within a range of 180.degree. to 300.degree. C. for 3 to 60 seconds. Thus, a natural aging-retardated aluminum alloy sheet is obtained.

Abstract: There is provided an aluminum alloy sheet material having high strength as well as excellent formability, which consists essentially, by weight percent, of 4.5 to 6% Mg, 0.0005 to 1% rare earth elements, 0.001 to 0.15% Ti, 0.0001 to 0.004% B, 0.05 to 0.2% Fe, 0.05 to 0.1% Si, 0.0001 to 0.03% Be, and the balance of Al and inevitable impurities. The aluminum alloy sheet material may further contain at least one element selected from the group consisting of 0.05 to 0.3% Cu, 0.1 to 1% Zn and 0.05 to 0.2% Mn, if required.

Abstract: An insert type extrusion die is presented for making small parts for use in electrical, automotive and other industries for manufacturing small component parts. The application of the invented die is illustrated for making multi-cavity flat aluminum tubes, which are used for small heat exchanger components, in automotive air-conditioners, condensors and radiators. The insert die is composed of a male die section having a protrusion part and a female die section having a die cavity is held detachably in a die holder. The male section is a roughly rectangular plate-shaped component, and has an integrally formed twist prevention region which is inserted into the receiver groove of the female section which is integrally formed thereon. The protrusion part defines the cavity shape of the multi-cavity flat tube, and the female section has the die cavity of the required cross sectional shape to define the outer shape of the tube.

Abstract: A composition for brazing aluminum or aluminum alloy characterized in that said composition contains aluminum alloy powder for brazing and thermoplastic acryl-based resin binder which is so volatile as to volatilize before being carbonized at a brazing temperature and said resin binder of 0.1 to 50 parts is used for aluminum alloy powder of 100 parts. When this technological idea was applied to brazing with a brazing material of aluminum alloy powder such as, for example, Al-Si, a preferable result of brazing could be obtained.

Abstract: A method of producing a heat exchanger comprising abutting a tube made of an aluminum material and fins made of an aluminum material, applying to the resulting abutments a flux containing zinc halide, and thereafter conducting a reaction soldering in an inert gas atmosphere. The assembled tube and fins applied with the flux may be moved in a position to enhance the formation of zinc deposited by the reaction soldering during the drying step of the flux. The heat exchanger produced by this method has a thick and uniform Zn coating at the joints with good mechanical strength and surface conditions.

Abstract: A method of producing a heat exchanger comprising abutting a tube made of an aluminum material and fins made of an aluminum material, applying to the resulting abutments a flux containing zinc halide, and thereafter conducting a reaction soldering in an inert gas atmosphere. The assembled tube and fins applied with the flux may be moved into a position to enhance the formation if zinc deposited by the reaction soldering during the drying step of the flux. The heat exchanger produced by this method has a thick and uniform Zn coating at the joints with good mechanical strength and surface conditions.