Abstract: A method of manufacturing a wheel rim for a vehicle includes an ironing step for ironing a tubular material to manufacture a tubular member having a non-constant thickness, using an ironing apparatus provided with a punch, a die whose side surface opposing the punch is a convex and concave surface, and a pressing member. At the ironing step, a flange portion of the tubular material is set at the die, then the pressing member is moved relative to the die thereby to squeeze the flange portion of the tubular material by the pressing member and the die, and then the punch is moved relative to the die to iron at least a portion of the tubular material except the flange portion of the tubular material to manufacture the tubular member having a non-constant thickness.

Abstract: A vehicle wheel disk includes a hat portion having a crest portion extending continuously in a circumferential direction of the disk, an inner curved portion curved inwardly in an axial direction of the disk radially inside the crest portion and extending continuously in a circumferential direction of the disk, and an outer curved portion curved inwardly in the axial direction of the disk radially outside the crest portion and extending in the circumferential direction of the disk.

Abstract: For providing a magnetostrictive film that can exhibit high magnetostrictive properties in the vicinity of zero magnetic field and their manufacturing methods, a magnetostrictive film thermal sprayed on an object under test includes a metallic glass film subjected to thermal processing at a temperature lower than the glass transition temperature and not lower than the Curie point, and shows a linearity between the magnetic field and the magnetostriction in at least a part of the magnetic field from ?15 kA/m to +15 kA/m (both inclusive).

Abstract: An endless track link that is able to reduce stress concentrations and to improve efficiency of an assembling process of the endless track link is detailed. A stress reinforcing part is formed in the region in which stress concentrations are generated in a window area. The reinforcing part extends in a direction apart from a track shoe and includes an extended part of a through-hole into which a track shoe connecting bolt is inserted. A female thread for engaging with the track shoe connecting bolt is formed at the extended part of the through-hole.

Abstract: A crawler belt 20 includes first regions and second regions alternately arranged in a circumferential direction thereof. The first region has at least one first tread lug 25 and the second region has at least one second tread lug 26. The first tread lug 25 has high flexural rigidity and is not easily bent and the second tread lug 26 has low flexural rigidity and is easily bent. The first tread lug 25 catches on an upper end of a high step or bump S with the second tread lug 26 in a bent condition, thus allowing the crawler unit to move over the step or bump.

Abstract: Theme To provide a small-sized crawler device that can stably ride over bumps or steps or stairs. Means to Solve The crawler device includes a device body (1) having main crawlers (20) on its left and right and auxiliary crawlers (30) provided as auxiliary members at one end portion of the device body. Before the crawler device ascends a step or stairs with the auxiliary crawler (30) positioned backward, the controller (65) brings the auxiliary crawler (30) into a preparatory state in which the auxiliary crawler (30) is freely rotatable with respect to the main crawler (20) or the auxiliary crawler (30) is maintained in a position above a line extending longitudinally from the main crawler by a predetermined angle.

Abstract: A vehicle wheel having a rim and a disk. A disk flange of the disk may have a non-contact portion non-contacting a radially inner surface of the rim, at a radially outer extension of a width center line of a spoke. As a result, the rigidity of a portion of the disk in the circumferential direction of the wheel where the spoke is provided may be decreased compared with a wheel (conventional) where such non-contact portion is not provided. A difference in rigidity of the disk in the circumferential direction of the wheel between a portion where the vent window is provided and a portion where the spoke is provided may be smaller than that in the case of the conventional wheel, whereby a durability of the wheel and a run-out accuracy of the wheel may be improved.

Abstract: The present invention is a press forging method by which porosities in a raw material are removed and mechanical properties such as ductility and toughness of a steel product are at a required level in a case that a steel ingot is treated as a raw material in press forging. A cylindrical steel ingot (a so-called “round billet”) is set onto a die as a raw material, and, a forging process is applied to the steel ingot so that buckling of the steel is not generated during the forging process and that a reduction ratio and a forging ratio are more than predetermined values, respectively.

Abstract: A wheel for vehicle includes a wheel body, a decorated member, and a visible space. The wheel body has a rim, a hub, and a plurality of spokes connecting the hub and the rim. The decorated member is made from resin, is disposed on a surface of at least one of the spokes, and is retained to the wheel body. The visible space is disposed between the decorated member and the one of the spokes at least, exhibits a height in an axial direction of the wheel body, and is visible from an axial outer side of the wheel body.

Abstract: A method of manufacturing a tubular member having a non-constant thickness by ironing at least a portion of the tubular material. The ironing apparatus can have a punch and a die, and the die can have a convex and concave side surface opposing the punch. The method can include bending an axial end portion of the tubular material to form a bent portion. The tubular material can then axially engage the die at the bent portion, and then the punch can be moved relative to the die to iron at least a portion of the tubular material.

Abstract: The technology provides vehicle wheels that can include a hub coupling portion and a spoke portion. The spoke portion can have a waved portion at a portion of the spoke portion in the radial direction of the wheel and can be decreased in section modulus at a cross section of the portion of the spoke portion taken along a plane perpendicular to the radial direction of the wheel. The waved portion can be formed by displacing the spoke bottom wall and/or the spoke reinforcing walls in the axial direction of the wheel.

Abstract: A vehicle wheel disk comprising: a hub coupling portion surrounding a hub hole; a plurality of spoke portions each extending outwardly in a radial direction of a wheel from the hub coupling portion and having a spoke bottom wall and a spoke side portion; a vent window located between adjacent spoke portions of the plurality of spoke portions; a disk radially outer portion located at a radially outer end portion of the wheel and connecting radially outer end portions of the plurality of spoke portions in a circumferential direction of the wheel; and a connecting wall located radially inside the disk radially outer portion and connecting a pair of spoke side portions located on opposite sides of the vent window in the circumferential direction of the wheel; wherein the spoke bottom wall includes a bottom wall inclined portion extending outwardly in an axial direction of the wheel from the hub coupling portion, and a bottom wall main portion extending outwardly in the radial direction of the wheel from the botto

Abstract: The technology provides vehicle wheel disks where a spoke portion can have a spoke bottom wall and a spoke side portion. The spoke side portion can include a spoke side wall rising from the spoke bottom wall in an axial direction of the wheel and a spoke reinforcing wall connected from an axially end portion of the spoke side wall and curved from the axial direction of the wheel toward a circumferential direction of the wheel and extending in the circumferential direction of the wheel. A pair of spoke side portions can be located on opposite sides of the vent window in the circumferential direction of the wheel have radially inner end portions which are connected to each other via a connecting wall. The connecting wall can be flat or substantially flat in the circumferential direction of the wheel.

Abstract: A metallic glass laminate of the present invention is characterized in that a metallic glass layer of amorphous phase is formed on the substrate surface, and there is no continuous pore (pinhole) through the metallic glass layer. The metallic glass laminate is preferably obtained by solidification and lamination of at least part of the metallic glass powder in the molten state or in the supercooled liquid state on the substrate surface. Because of the dense metallic glass layer of homogenous amorphous phase, the functionalities of metallic glass such as corrosion resistance and wear resistance can be satisfactorily provided. A thick and a large-area metallic glass layer can be formed. The metallic glass layer can also be formed into various shapes within the supercooled liquid temperature range. In addition, a metallic glass bulk can be obtained by removing the substrate.

Abstract: A method comprising: a step of preforming a plurality of bulging portions on a substantially circular plate blank, the bulging portions being located concentrically and circumferentially outward of a bolt hole, each of the bulging portions being a base of a reinforcing portion of a spoke; a step of forming a plurality of prototypical decorative holes on the respective bulging portions to form a prototypically-shaped spoke between the adjacent prototypical decorative holes; a step of forming a disk flange by bending an outer circumferential portion of the plate blank, on which the prototypical decorative holes are formed, at a right angle to be substantially parallel to a wheel axial direction, so that an outer periphery of a resultant decorative hole forms an upper end edge of the disk flange; and a step of forming the spoke by providing the prototypically-shaped spoke with the reinforcing portion.

Abstract: The present invention provides an organic-coated synthetic mica powder excellent in feeling in use and water-repellent property by an organic coating layer from an organic surface treatment agent, which is firmly and chemically bound to the surface of the synthetic mica powder, and further provides, when an organosilicone having Si—H groups is used as the organic surface treatment agent, an organic-coated synthetic mica powder having very little hydrogen evolution due to residual Si—H groups. The organic-coated synthetic mica powder can be obtained by a producing method comprising a pretreatment process and a coating process, said pretreatment process comprising: contacting synthetic mica powder and an ammonium ion in water; carrying out solid-liquid separation to remove the liquid phase; and drying the solid phase at 200° C.

Abstract: The present invention provides a magnesium-based composite material that can achieve excellent performance such as high tensile strength not only at ordinary temperature but also at high temperature. The magnesium-based composite material of the present invention is Al2Ca-containing magnesium-based composite material, wherein said composite material is obtained by a solid-phase reaction of an aluminum-containing magnesium alloy and an additive, said additive being calcium oxide, and said composite material contains Al2Ca formed in the solid-phase reaction. In the magnesium-based composite material, CaO, in combination with Al2Ca, can be dispersed.

Abstract: The present invention relates to a method for heat treatment of a columnar work. In order to provide the method for heat treatment of a columnar work being able to attain a high productivity, a reduction of cost, and an improvement of quality, as compared with the prior art, the method for heat treatment of a columnar work of the present invention includes a quench-hardening step (S1) and a tempering step (S2) being carried out after the quench-hardening step (S1), the quench-hardening step (S1) includes a first quench-hardening step (S11) and a second quench-hardening step (S12) being carried out after the first quench-hardening step (S11), the entire region of the columnar work (3) from an outer circumferential surface (31f) to a core thereof (32), or a partial region thereof, is heated up to a temperature not lower than a transformation temperature Ac3, and then, the work is quench-hardened.

Abstract: Provided is an SnCu lead-free solder alloy which eliminates a drawback that an intermetallic compound excessively precipitates and the precipitate serves as nuclei to form dross to thereby cause soldering defects including a needle-like protrusion to occur, thus to satisfy all of the properties required for practical use. A lead-free solder alloy contains 0.1 to 1.5% by weight of Cu, not less than 0.01 and less than 0.05% by weight of Co, 0.05 to 0.5% by weight of Ag and 0.01 to 0.1% by weight of Sb, the remainder being Sn, or further contains 0.001 to 0.008% by weight of Ge, whereby the formation of dross is prevented, and thus the drawback that soldering defects including a needle-like protrusion occur is eliminated.

Abstract: The degree of freedom in design is increased while maintaining strength by enabling a decorative member to be disposed without thinning a wheel main body. A wheel is made up of a wheel main body 1 which is made up of a rim portion 10 and a disc portion 11 and which has a vent hole 141 in the disc portion 11 and a decorative member 2 made from a resin which is held in at least the disc portion 11 and is observed from the vent hole 141. Since the decorative member 2 is observed in the vent hole 141, the wheel main body 1 including spoke portions 14 does not have to be thinned. In addition, since the design of the decorative member is observed in cooperation with the design of the disc portion 11, the degree of freedom in design is increased.