Abstract: A vertically oscillating working device 2 has a body to be oscillated 23 having an inner space that is formed by a cover member 21 and a vehicle wheel 22, which is a body to be worked, and receives working materials 25 in it and also has oscillating means for vertically oscillating the body to be oscillated 23. The working materials 25 are allowed to collide with the vehicle wheel 22 by the oscillation, and thereby the vehicle wheel 22 is worked. With the working device 2, a casting can be oscillated together with hardening materials, and excellent mechanical properties can be uniformly added to a predetermined portion of the casting by the oscillation without changing the position of the casting.

Abstract: A vertically oscillating working device 2 has a body to be oscillated 23 having an inner space that is formed by a cover member 21 and a vehicle wheel 22, which is a body to be worked, and receives working materials 25 in it and also has oscillating means for vertically oscillating the body to be oscillated 23. The working materials 25 are allowed to collide with the vehicle wheel 22 by the oscillation, and thereby the vehicle wheel 22 is worked. With the working device 2, a casting can be oscillated together with hardening materials, and excellent mechanical properties can be uniformly added to a predetermined portion of the casting by the oscillation without changing the position of the casting.

Abstract: There is provided a surface treated product that moves relatively in a fluid, wherein a surface of the surface treated product has continuous dimples, each dimple having a diameter of 10 to 2500 ?m and a depth of 50 ?m or less. The surface treated product significantly reduces resistance of a fluid to an object in the fluid, and significantly improves a flow state of the fluid.

Abstract: A vehicle wheel 1 having a plurality of subsidiary air chambers 3, which is annularly incorporated on a rim outer peripheral surface 4, a cover member 13 having a lug part extended over the entire periphery and a stepped part extended over its periphery along the inside of the lug part 16, and a bottom plate member 14 being superimposed with each other through a seal member made of an elastic member and interposed therebetween in an airtight manner, and the cover member 13 and the rim outer peripheral surface 4 being joined to each other in a joint part 10, wherein the cover member 13 and the rim outer peripheral surface 4 are made into contact with each other so as to form a subsidiary air chamber 3 having air-tightness.

Abstract: A graphite spheroidizing agent capable of spheroidizing graphite while preventing formation of chunky graphite is provided. The graphite spheroidizing agent of the present invention comprising silicon, magnesium, calcium and rare earth elements, wherein the graphite spheroidizing agent contains rare earth elements of 0.6 to 3.0 mass % and a calcium content of 1.3 to 4.0 mass %, respectively, relative to the total amount thereof, and a percentage of lanthanum in the rare earth elements is 50 mass % or more.

Abstract: There is provided a surface treated product that moves relatively in a fluid, wherein a surface of the surface treated product has continuous dimples, each dimple having a diameter of 10 to 2500 ?m and a depth of 50 ?m or less. The surface treated product significantly reduces resistance of a fluid to an object in the fluid, and significantly improves a flow state of the fluid.

Abstract: There is provided a surface treated product that moves relatively in a fluid, wherein a surface of the surface treated product has continuous dimples, each dimple having a diameter of 10 to 2500 ?m and a depth of 50 ?m or less. The surface treated product significantly reduces resistance of a fluid to an object in the fluid, and significantly improves a flow state of the fluid.

Abstract: A heat-treatment apparatus including a first furnace for heat treatment and solution treatment of a work piece, and a second furnace for heat treatment and aging treatment of a work piece, wherein each furnace includes a dispersion tube cantilevered and immersed within a fluidized bed, the tube for blowing hot air into the fluidized bed. The first furnace includes a heat exchanger for recovering waste heat from gases discharged the first furnace for use as a heat source for the second furnace.

Abstract: There is disclosed a cast-forged product of an aluminum alloy consisting essentially of: 0.6 to 1.8 wt % of silicon; 0.6 to 1.8 wt % of magnesium; 0.8 wt % or less of copper; 0.2 to 1.0 wt % of manganese; 0.25 wt % or less of chromium; 0.0 to 0.15 wt % of titanium; and unavoidably contained impurities. When the product is used as various parts for automobiles formed of aluminum, such as suspension parts, frames, and parts for engines, the product is more superior in mechanical properties such as a tensile strength, proof stress, and elongation, and can be manufactured with a low cost.

Abstract: A vehicle wheel includes a rim for mounting a tire thereon and at least one hollow air chamber provided inside the rim, and the rim having the air chamber is integrally cast so as to have the vehicle wheel having the rim with an excellent mechanical strength and achieving stable traveling.

Abstract: There is provided a precipitation hardening Al alloy in which an average area of eutectic structures existing in the Al alloy is less than 4 ?m2. This Al alloy contains 6.5 to 7.5% by mass of Si, 0.36% by mass or less of Mg and 20 to 70 ppm of Sr, and is preferably used as a vehicle wheel. In heat treatment method of the precipitation hardening Al alloy, a work piece is subjected to solution treatment by being made to exist in a fluidized bed, and further a rate of solid solutions of Si and/or Mg into a phase is made to be 60% or more in the solution treatment and aging treatment is carried out at temperatures from 150° C. or more to less than 200° C. The precipitation hardening Al alloy to be obtained has well-balanced three mechanical properties of tensile strength, yield strength, and elongation, and is also excellent in fatigue strength.

Abstract: There is disclosed a mold (1) for casting including: a lower mold (6) having four gates (5) (at least one gate); an upper mold (7) being matched with the lower mold (6) to form a cavity; and side molds (2a), (2b) being matched with the lower mold (6) and upper mold (7) to form the cavity and being split (into at least two). In the mold (1) for casting is constituted an upper surface of a weir (4) of a flat portion of side molds (2a), (2b), and other surfaces of the weir (4) is constituted of a concave portion of the lower molds (6), and the weir (4) is disposed so as to keep a parting line (3) between the side molds (2a), (2b) away. The mold (1) for casting can easily be demolded, and the desired number of gate systems can be formed in desired positions.

Abstract: A non-austemper-treated spheroidal graphite cast iron obtainable without being subjected to an austemper treatment. The non-austemper-treated spheroidal graphite cast iron has a tensile strength of 650-850 MPa and an elongation of 7.0-14.5%. In the non-austemper-treated spheroidal graphite cast iron, V-notch material has a fatigue limit of 290 MPa or more. The non-austemper-treated spheroidal graphite cast iron has well-balanced mechanical properties both in tensile strength and elongation and improved tensile strength and elongation than conventional one.

Abstract: There is provided a heat treatment unit which uses a multi-layered heat treatment furnace (1) comprising a layer of fluidized bed (2) composed of particles and another layer of atmosphere layer (3) composed of gases, the former being excellent in thermal efficiency and uniformity of heat distribution and the latter being positioned in the free board section over the fluidized bed (2), in which these layers operate at temperature levels different from each other, and the work piece is heat-treated by being partly immersed in the fluidized bed (2) having a given temperature with the other part being exposed in the atmosphere layer (3) also operating at a given temperature, according to desired mechanical properties of the work piece at each position. This heat treatment unit is improved from the conventional one in that it can give desired mechanical properties which are required by each part of metallic work requires without increasing the investment cost.

Abstract: This invention is directed to a method for manufacturing an aluminum cast-forged product by forging a preform made of a material for forging obtained by casting a material for forging of an aluminum alloy, and an aluminum cast-forged product produced thereby. Forming is performed by heating the preform made of a material for forging at a temperature of from approximately 450° C. to a melting point of the alloy. In this method, a recycled material may be used as a starting material, and some omission of the steps may be possible. There is provided a method for manufacturing an aluminum cast-forged product having excellent mechanical properties, such as, a higher tensile strength, higher proof stress, higher elongation, and the like with a lower production cost.

Abstract: A non-Cu-based cast Al alloy contains substantially no Cu, and has a tensile strength of 305 MPa or more, a 0.2% yield strength of 220 MPa or more, and an elongation of 10% or more. In the heat treatment of the cast Al alloy, the solution treatment is performed using a fluidized bed 18, and the solution treatment is performed by rapid heating up to the solution treatment temperature in 30 minutes, and maintaining the solution treatment temperature in 3 hours or less. Because this method for heat treatment performs solution treatment at an increased speed of heating-up time, with small deviation of temperature, and at a higher temperature, total time for heat treatment can be shortened drastically in comparison with the conventional method. A non-Cu-based cast Al alloy having well-balanced mechanical properties of tensile strength, yield strength, and elongation can be provided.

Abstract: A non-Cu-based cast Al alloy contains substantially no Cu, and has a tensile strength of 305 MPa or more, a 0.2% yield strength of 220 MPa or more, and an elongation of 10% or more. In the heat treatment of the cast Al alloy, the solution treatment is performed using a fluidized bed 18, and the solution treatment is performed by rapid heating up to the solution treatment temperature in 30 minutes, and maintaining the solution treatment temperature in 3 hours or less. Because this method for heat treatment performs solution treatment at an increased speed of heating-up time, with small deviation of temperature, and at a higher temperature, total time for heat treatment can be shortened drastically in comparison with the conventional method. A non-Cu-based cast Al alloy having well-balanced mechanical properties of tensile strength, yield strength, and elongation can be provided.

Abstract: There is disclosed a cast-forged product of an aluminum alloy consisting essentially of: 0.6 to 1.8 wt % of silicon; 0.6 to 1.8 wt % of magnesium; 0.8 wt % or less of copper; 0.2 to 1.0 wt % of manganese; 0.25 wt % or less of chromium; 0.0 to 0.15 wt % of titanium; and unavoidably contained impurities. When the product is used as various parts for automobiles formed of aluminum, such as suspension parts, frames, and parts for engines, the product is more superior in mechanical properties such as a tensile strength, proof stress, and elongation, and can be manufactured with a low cost.

Abstract: There is disclosed a mold (1) for casting including: a lower mold (6) having four gates (5) (at least one gate); an upper mold (7) being matched with the lower mold (6) to form a cavity; and side molds (2a), (2b) being matched with the lower mold (6) and upper mold (7) to form the cavity and being split (into at least two). In the mold (1) for casting is constituted an upper surface of a weir (4) of a flat portion of side molds (2a), (2b), and other surfaces of the weir (4) is constituted of a concave portion of the lower molds (6), and the weir (4) is disposed so as to keep a parting line (3) between the side molds (2a), (2b) away. The mold (1) for casting can easily be demolded, and the desired number of gate systems can be formed in desired positions.

Abstract: There is provided a surface treated product that moves relatively in a fluid, wherein a surface of the surface treated product has continuous dimples, each dimple having a diameter of 10 to 2500 &mgr;m and a depth of 50 &mgr;m or less. The surface treated product significantly reduces resistance of a fluid to an object in the fluid, and significantly improves a flow state of the fluid.