Abstract: A bumper beam for automobiles is composed in cross section of a top wall, a bottom wall opposed to the top wall, a pair of lateral walls connecting the top and bottom walls at opposite ends, one of the lateral walls being a collision side lateral wall and the other a vehicle-mounted side lateral wall, and a connection rib provided intermediate between the top and bottom walls and connecting the lateral walls. The collision side lateral wall is thicker than the vehicle-mounted side lateral wall, and both corners at opposite ends of the collision side lateral wall are curved with a radius of curvature R of 0.1-0.3 of the length of the collision side lateral wall and both corners at opposite ends of the vehicle-mounted side lateral wall are curved with a radius of curvature of 0.6-2.0 of the thickness of the vehicle-mounted side lateral wall. Alternatively, radius of curvature R may be 0.2-0.6 of the length of the bottom wall.

Abstract: The present invention relates to a suspension member attaching structure for attaching a suspension member to a vehicle body structure member. A lower reinforcing member 5 is connected to the upper surface of a bottom portion 2C of a front sub-frame 2, which is a vehicle body structure member, by welding or the like, an upper reinforcing member 6 having an upper attachment flat portion 6C located at an intermediate height position of the front sub-frame 2 is provided on the front sub-frame 2, connection Y between the upper reinforcing member 6 and the upper part of a bolt 3 is provided by direct arc welding or the like, and connection X between a collar portion 4 formed at an intermediate portion of the bolt 3 and the lower reinforcing member 5 are provided by arc welding or the like. Thereby, the lower part of the bolt 3 is caused to pass through the lower reinforcing member and the bottom portion 2C of the front sub-frame 2 and is projected from these two members.

Abstract: A method is provided for forming spline teeth on the walls of a press-formed sheet-metal article on which two peripheral walls of different diameters are disposed in a continuous manner via a step portion by means of a die with a plurality of steps of ironing surfaces, and a punch having a plurality of corresponding ironing surfaces. The punch is provided with a first punch and a second punch which are arranged in a split manner. The second punch first irons teeth on the larger diameter peripheral wall. While the first punch is next used to iron teeth on the smaller diameter peripheral wall, at least some of the pressurizing force on the second punch is maintained to avoid the creation of flaws in the step portion of the sheet metal article.