Abstract: A crash box is configured to absorb an impact caused by a collision of a vehicle. The crash box includes a front end surface configured to receive the impact, a rear end surface configured to be attached to the vehicle; and a first wall surface and a second wall surface both extending from the rear end surface to the front end surface. The first wall surface and the second wall surface face each other. A length of the second wall surface from the front end surface to the rear end surface is longer than a length of the first wall surface from the front end surface to the rear end surface.

Abstract: A crash box is configured to absorb an impact caused by a collision of a vehicle. The crash box includes a front end surface configured to receive the impact, a rear end surface configured to be attached to the vehicle; and a first wall surface and a second wall surface both extending from the rear end surface to the front end surface. The first wall surface and the second wall surface face each other. A length of the second wall surface from the front end surface to the rear end surface is longer than a length of the first wall surface from the front end surface to the rear end surface.

Abstract: A battery case provided with a safety valve (4) in which a breakage groove (45) is used, wherein in order to stabilize the operation pressure, a lid (2) of the battery case has formed thereon: a thin plate portion (30) obtained by thinning a plate part (3); and a first recessed part (40) comprising a curved part (44) in which the thin plate portion (30) is indented inward, with respect to the case, in a curved shape. The breakage groove (45) for the safety valve (4) is formed at the bottom part (440) of the curved part (44). A first connecting portion (46) and a second connecting portion (47) of the plate part (3), which connect to the curved part (44) on both sides flanking the curved part (44), are at positions protruding toward the outside of the case from the plate part (3).

Abstract: The invention provides a friction-welded part featuring easy design as well as a method of producing said part. The friction-welded part 1 is produced by friction-welding a first member 10 and a second member 20 together. The first member 10 is made of an aluminum alloy material, having a uniform cross-section portion 11 whose cross-sectional shape and size are not changed. The second member 20 is made of an aluminum alloy material, having a uniform cross-section portion 21 whose cross-sectional shape and size are not changed. According to the invention, the uniform cross-section portions 11 and 21 are friction-welded together to form the part 1. A heat affected zone “H” caused by friction welding is formed only in the uniform cross-section portions 11 and 21. The uniform cross-section portion 11 of the first member 10, and the uniform cross-section portion 21 of the second member 20, respectively, have a cylindrical shape, preferably having the same sectional dimension.

Abstract: A double floor structure capable of being adapted to the conditions of construction and the needs of users at low cost. A double floor structure (K) provided with support legs (1) which are provided on a lower floor and rows of beams which form an upper floor. The support legs (1) are each provided with an upper member (14) which supports a beam from the lower side, an intermediate member (13) which supports the upper member (14) from the lower side, and a lower member (12) which supports the intermediate member (13) from the lower side. The upper member (14), the intermediate member (13), and the lower member (12) consist of metallic, extruded shape material and are disposed in such a manner that the direction of the extrusion is aligned with the top-bottom direction.

Abstract: A double floor structure capable of being adapted to the conditions of construction and the needs of users at low cost. A double floor structure (K) provided with support legs (1) which are provided on a lower floor and rows of beams which form an upper floor. The support legs (1) are each provided with an upper member (14) which supports a beam from the lower side, an intermediate member (13) which supports the upper member (14) from the lower side, and a lower member (12) which supports the intermediate member (13) from the lower side. The upper member (14), the intermediate member (13), and the lower member (12) consist of metallic, extruded shape material and are disposed in such a manner that the direction of the extrusion is aligned with the top-bottom direction.

Abstract: A method for producing an aluminum composite material having a great content of a ceramics with ease. The method (a) mixes an aluminum powder and ceramic particles, to prepare a mixed material, (b) subjects the mixed material to electric pressure sintering together with a metal sheet material, to form a clad material including a sintered product covered with the metal sheet material, and (c) subjects the clad material to a plastic working to prepare an aluminum composite material. In the (b) subjecting, the mixed material is sandwiched between a pair of metal sheets or a powder of the mixed material is held in a metal container, the mixed material is placed in a forming die in a state in which the metal sheet material is pressurized by a punch, and the mixed material is compressed together with the metal sheet material. The metal sheet material is made of aluminum or stainless steel.

Abstract: A powder alloy rolling case (1) includes a side face configuring member (10) formed like a rectangular frame with two members (10a, 10a) combined, and surrounding side faces of metal powder (2); an upper lid configuring member (11) provided to cover one opening of the side face configuring member (10), and covering an upper face of the metal powder; and a lower lid configuring member (12) provided to cover the other opening of the side face configuring member (10), and covering a lower face of the metal powder (2), wherein joints (10b, 10b) between the members (10a, 10a) configuring member (10) are provided in opposing two side faces out of four side faces of the side face configuring member (10).

Abstract: An object of this invention is to provide a case for rolling powder alloy without failures at the time of rolling. The case for rolling powder alloy (1) is formed like a shape of box and comprises a side constituent member (10) forming like a rectangular frame in a combination of two members (10a, 10a) and surrounding a side surface of metal powder, an upper lid constituent member (11) mounting on one opening of the side constituent member (10) and covering an upper surface of the metal powder, and a lower lid constituent member (12) mounting on the other opening of the side constituent member (10) and covering a lower surface of the metal powder. The peripheral edges of the upper lid constituent member (11) and the lower lid constituent member (12) are,respectively, provided with a peripheral wall (11b, 12b) standing upright along an outer peripheral surface of the side constituent member, and the side constituent member (10) is inserted into a space surrounded by the peripheral wall (11b, 12b).

Abstract: A method for producing an aluminum composite material having a great content of a ceramics with ease. The method (a) mixes an aluminum powder and ceramic particles, to prepare a mixed material, (b) subjects the mixed material to electric pressure sintering together with a metal sheet material, to form a clad material including a sintered product covered with the metal sheet material, and (c) subjects the clad material to a plastic working to prepare an aluminum composite material. In the (b) subjecting, the mixed material is sandwiched between a pair of metal sheets or a powder of the mixed material is held in a metal container, the mixed material is placed in a forming die in a state in which the metal sheet material is pressurized by a punch, and the mixed material is compressed together with the metal sheet material. The metal sheet material is made of aluminum or stainless steel.