Abstract: Material characteristics that a foamed filler material (s) to be filled in a frame cross section (fr) should have are discussed. By using a material complying with the characteristics, the energy absorbability of the frame (fr) is effectively enhanced. In a frame structure (fr) for vehicle bodies in which a filler material is filled in at least part of the cross section of a frame, the filler material is set to a mean compressive strength of not less than 4 MPa and/or a maximum bending strength of not less than 10 MPa. More particularly, the filler material is set to a mean compressive strength of not less than 5 MPa and/or a maximum bending strength of 60 MPa.

Abstract: In order to provide a die structure for injection molding of a light alloy free from gas defects, and a method of molding a light alloy parts using the die, the die structure is used for converting a light alloy into a semi-molten state, wherein a solid phase and a liquid phase coexist, or a molten state at a temperature just above a melting point and injecting the molten metal into an interior cavity portion, and S1/S2 of a gate sectional area S1 with respect to a maximum sectional area S2 of the cavity of the mold which area is almost perpendicular to the flowing direction of the melt therein is set in a range of 0.06 to 0.5.

Abstract: The present invention provides a method for joining two metal members into a joined metal member. The method comprise steps of; applying a brazing material having a higher melting point than both the members on the surface of a first metal member and heating them to form a brazing material on said surface and a braze-diffusion layer under the brazing material in the surface area of the first member; and, then, pressing the first and another second metal members between which the brazing material is interposed during heating at a higher temperature than said melting point of the brazing material to squeeze the molten brazing material out between both the contact surfaces of both the metal members, therefor the two metal members being joined by the braze diffusion layers formed in both the surfaces into the joined metal member.

Abstract: The film boiling state of a refrigerant is maintained for a time longer than in the prior art by t to lower the nuclear boiling start temperature to a temperature at which the material proof strength of a work exceeds thermal stress, thereby lowering the cooling rate of the work. In addition, by controlling the cooling rate in hardening, the film boiling state of the refrigerant is maintained to a temperature at which the material proof strength exceeds thermal stress, thereby cooling the work at a temperature equal to or higher than the critical cooling rate of the work.

Abstract: A method is provided for producing a preform structure which is used in a composite aluminium or aluminium alloy component in which a base metal of an aluminium or aluminium alloy is reinforced with reinforcing materials. A slurry is prepared by mixing reinforcing materials including ceramic particles and first whiskers with burning-away powders and liquid. Liquid components contained in the slurry are filtered to provide a dehydrated structure. Thereafter a preform structure is produced by sintering the ceramic particles with the first whiskers after burning the burning-away powders in the dehydrated structure.

Abstract: This invention is to provide a magnesium alloy cast material capable of manufacturing a wheel, a large-sized forged piece such as wheel having properties equivalent to those of aluminum molten forged member, directly from the state of continuous cast material. The magnesium alloy cast material is a nearly intermediate alloy composition between conventional AZ61 alloy and AZ80 alloy, comprising Al: 6.2 to 7.6 wt. %, Mn: 0.15 to 0.4 wt. %, Zn: 0.4 to 0.8 wt. % and Mg: balance, and casting by defining the mean crystal grain size under 200 .mu.m. The forgeability is excellent, and when forged, a forged piece superior in mechanical properties and corrosion resistance to the aluminum molten forged member can be manufactured.

Abstract: A metallic porous product is produced by applying a slurry of a mixture of skeleton constituent metal particles and property modifying particles to an inflammable porous foam, burning the inflammable porous foam having open pores by heat to provide a metallic skeleton structure, and sintering the metallic skeleton structure.

Abstract: A method for preparing a light metal or light metal alloy composite product, wherein (a) an aqueous slurry containing water, a reinforcement powder, a metal powder and an alumina sol binder is prepared; (b) a preform is prepared from the slurry; (c) the preform is sintered; and (d) the sintered preform is impregnated with a melt of a light metal or a light metal alloy to produce a light metal or a light metal alloy based composite product.

Abstract: The invention provides a method for injection molding a semi-molten melt of metal to a product, wherein a semi-molten melt of metal is injected into a cavity of the mold through a nozzle of injector to mold the product which is divided in a lower solid fraction portion to require strength and a higher solid fraction portion to require molding accuracy along flow of the melt inside the cavity. In the method of the invention, a part of the melt to be earlier injected is determined to be at a lower temperature in the injector than a part to be later injected among the melt parts composing said lower and higher solid portions in the cavity by injecting a batch of the melt, and that the melt is injected into the cavity on the side on which said lower solid fraction portion for the strength of the product is formed.

Abstract: It is an object of the invention to provide high-ductility alloy which is improved both in casting characteristics and elongation without lowering strength by selecting a good combination of ingredients and a proportion thereof. It is another object of the invention to provide a casting which has an good elongation without being heat-treated. It is a further object of the invention to provide a method of manufacturing integral parts having some portions with specific construction which make it impossible for a set of molding dies to be separated after finishing casting by means of in-one-piece molding. Those objects can be accomplished bay providing an high ductility aluminum alloy which contains manganese ingredient, iron ingredient, magnesium ingredient and slice of unavoidable impurity, wherein a content of the iron usually regarded as impurity is set within specified limits, magnesium content is relatively less and manganese content is relatively more than that in a conventional aluminum alloy.

Abstract: An article of manufacture made of a magnesium alloy is made by casting the magnesium alloy to provide a billet, forging the billet to render material of the billet to have an average crystalline particle size of not greater than 100 .mu.m; and carrying out a T6 treatment (a solution treatment and an artificial aging treatment) with respect to the billet. Physical properties such as, for example, the tensile strength, elongation and the like of the article are considerably improved by virtue of the synergistic effect of the micronized crystalline particles and the T6 treatment.

Abstract: This invention relates to a method for producing a magnesium light alloy product. In order to enhance formability in plastically forming a magnesium alloy material and obtain high tensile strength and high proof stress in the final product, the magnesium alloy material is cast by using molten magnesium alloy containing strontium of 0.02 to 0.5 weight percent and then plastically formed into a magnesium light alloy product in set shape.

Abstract: The manufacturing method of plastically formed products prevents the generation of cracks at the time of plastic working, thereby increasing the productivity. It is also prevented that the metallic particles constituting the product become large and rough in structure. In the manufacturing method, only the compact treatment and the vacuum deaeration treatment are carried out prior to the extrusion treatment, without the pressure-heat treatment performed. Therefore, processing steps prior to the extrusion treatment are simplified, so that the productivity of the plastically formed products is improved and the metallic particles are prevented from being large and rough. The diffusion treatment between the extrusion treatment and the forging treatment enhances the adhesion at the inner part of the extruded material in the radial direction, whereby the generation of cracks at the time of plastic working is avoided.

Abstract: A method for producing a magnesium light alloy product. In order to enhance formability in plastically forming a magnesium alloy material and obtain high tensile strength and high proof stress in the final product, the magnesium alloy material is cast by using molten magnesium alloy containing strontium of 0.02 to 0.5 weight percent and then plastically formed into a magnesium light alloy product in set shape.

Abstract: An article of manufacture made of a magnesium alloy is made by casting the magnesium alloy to provide a casting, forging the casting to render material of the casting to have an average crystalline particle size of not greater than 100 .mu.m, and carrying out a T6 treatment (a solution treatment and an artificial aging treatment) with respect to the casting. Physical properties such as, for example, the tensile strength, elongation and the like of the article are considerably improved by virtue of the synergistic effect of the micronized crystalline particles and the T6 treatment.

Abstract: An automatic tension adjuster for a fan belt which automatically adjusts the tension of a fan belt even at the time of sudden decrease in speed of an associated engine so as to prevent slip, so-called "creak" or the like from occurring between the fan belt and a crank pulley. For this purpose, there is provided an adjusting means (30) for automatically adjusting an amount by which a lever (5) swings in a direction opposite to that in which it has pushed a tension pulley (4) against the fan belt (8) when the rotational speed of the crank pulley (1) suddenly lowers. This adjusting means includes the lever (5), a yoke (10), an adjusting bolt (13), a lock nut (14) and a fixing bracket (20).

Abstract: In transferring color image data having a tone on a recording paper, a threshold matrix data for adjusting the tone is selected in accordance with the image data having a dot arrangement. The threshold conversion curve of the threshold matrix data selected is used to correct a variation in the tone of the image data due to mechanical and electrical variations in a color image transferring apparatus including variations in the rotation speed of a transferring drum, a power source voltage to be applied to a transferring head and a relative position between the transferring drum and the recording paper. This correction can achieve improved transference of the image data on the recording paper.

Abstract: A method for forming a coating film with a relief pattern, which comprises coating an undercoating material on a substrate surface to form a cured undercoating film, coating an intermediate coating material partly on the undercoating film in a desired pattern, drying it to such an extent that the amount of the solvent in the formed intermediate coating film is within a range of from 1 to 50% by weight, then overcoating a top coating material comprising, as binders, a polyester resin and an aminoplast resin cross-linking agent having a surface tension of at least 40 dyn/cm over the entire surface, followed by baking and curing to form a top coating film with the relief pattern.

Abstract: A damper includes a cylinder, a partition member for partitioning the interior of the cylinder into two liquid chambers, an orifice for generating a damping force by flow of liquid, and a bypass path affording communication between the two liquid chambers. The damper further includes a mass body attached to the partition member that is movable in an axial direction of the cylinder and biased to close the bypass path. The speed of the mass body when opening the bypass path is faster than the speed of the mass body when closing the bypass path.

Abstract: A reproducing apparatus is arranged to have a plurality of reproducing modes corresponding to a plurality of recording modes in which recording is performed on a tape-shaped recording medium by allowing the medium to longitudinally travel at one of different speeds and to reproduce information signals recorded in recording tracks which are formed on the tape-shaped recording medium in the direction of crossing the longitudinal direction of the medium by recording the signals at least in one of the recording modes.