Abstract: A method for producing a press-formed product that includes a pair of flat sections and a bend section that connects the flat sections, in which a bending radius of the bend section is R2 and an interior angle formed by the pair of flat sections is ?2, includes the steps bellow. In the first forming step, an intermediate formed product including a bend section in which a bending radius is R1 and an interior angle is ?1 is formed. In the second forming step, a portion of a bend section of the intermediate formed product is formed into the bend section of the press-formed product. R1, ?1, R2 and ?2 satisfy the conditions of Formulae (1) to (3) below: 1.05<A1/A2 ??(1); 1.0<R1/R2 ??(2); A1/A2<6.0/(R1/R2) ??(3), where, A1, A2 represents the supplementary angle of the interior angle ?1, ?2, respectively.

Abstract: The steel material for an impact absorbing member has a composition containing: by mass %, C: 0.05 to 0.18%, Mn: 1 to 3%, Si+Al: at least 0.5% and less than 2.5%, and N: 0.001 to 0.015%, and in some cases, Cr: at most 0.5%, Mo: at most 0.2%, Ti: at most 0.05%, Nb: at most 0.05%, V: at most 0.2%, and B: at most 0.002%, the remainder being Fe and impurities. The steel material structure contains at least 70% by area of bainite made up of a lath structure having an average interval of at most 1 mm and martensite, 5 to 30%, and satisfies Formulas (1) and (2): (1) 1.2 £ HM0/HB0 £ 1.6, (2) 0.90 £ {(HM10/HM0)/(HB10/HB0) £ 1.3, where HM0 and HM10 represent average nano hardness in an initial state and after 10% tensile deformation of the martensite, and HB0 and HB0 represent that of bainite, respectively.

Abstract: A panel-shaped formed product made of a metal sheet includes a top panel portion, an opening portion, and a vertical wall portion. The top panel portion is polygonal. The opening portion is provided in the top panel portion. The vertical wall portion extends from at least not less than two adjacent borders among the borders of the top panel portion. At least one pair of each vertical wall portion of pairs of adjacent vertical wall portions of the vertical wall portions has a stepped portion. As a result, the panel shaped formed product has fewer defects such as cracks and wrinkles even when it has a shape that is difficult to form.

Abstract: A bumper beam includes a first member, a second member, and an inner plate. The first member includes a top plate section, two vertical wall sections, and two flange sections. The two flange sections connect to the two vertical wall sections, respectively. The second member is plate-shaped, is joined to the two flange sections of the first member, and doses the gap between the two flange sections at least. The inner plate is joined to the two vertical wall sections of the first member and is disposed substantially in parallel with the second member in a space formed by the first member and the second member. Out of the first member and the second member, the second member is disposed facing the outside of a vehicle. Such a bumper beam has high energy absorption efficiency.

Abstract: A press-formed body (15) made of a high-tensile strength steel sheet of 390 MPa or more including a groove bottom part (15a), ridge line parts (15b, 15b) continuous to the groove bottom part (15a), and side wall parts (15c, 15c) continuous to the ridge line parts (15b, 15b), and in which an outward flange (16) is formed at an end part in a longitudinal direction is manufactured by a press-forming apparatus including a punch (11), a die (12), and a pad (14) which presses and binds a press-forming material (13) to the punch (11), thereby forming the press-formed body (15) without providing cutouts at a ridge line part flange portion of the outward flange, or generating lowering of material yield.

Abstract: [Object] There is provided a long structural member made of metal, which has a substantially gutter-shaped cross section and is excellent in load transfer properties when an impact load is applied. [Solution] A structural member made of metal, formed so as to extend long in a predetermined direction, and having a gutter bottom, two ridges continuing to both ends in a width direction of the gutter bottom, and two vertical walls continuing to the two ridges, includes an outward continuous flange continuously formed at least along the gutter bottom, the ridges, and the vertical walls at an end in the predetermined direction, in which a width of the gutter bottom is reduced as a distance from the end having the outward continuous flange becomes larger.

Abstract: The present invention has as its object the provision of a T-shaped joint structure sufficiently securing a mounting region for another member and securing rigidity of a joint part. A first member and a second member joined with the first member and extending in a direction vertical to the longitudinal direction of the first member are provided. In a side view of first member in the longitudinal direction, the part of the first member joined with the second member, that is, a first member side joining element, is slanted from the first member toward the second member so that the first member becomes tapered. The part of the second member joined with the first member, that is, a second member side joining element, is slanted from the first member toward the second member in the same direction as the first member side joining element. The first member side joining element and second member side joining element are smoothly joined to form a joined part.

Abstract: A producing method of the press formed product includes a preparation step of preparing a metal sheet as a starting material, and a press working step of performing press working on the starting material by using a punch, and a pad and a die that are paired with the punch. The press working step includes a first step of forming, by the punch and the pad, the entire region of a top panel part, the entire region of each of a ridge line parts including the shape-changing part, and a region up to a predetermined height from the border between a vertical wall part and the ridge line part of a region of each of the vertical wall parts, and a second step of forming, subsequent to the first step, by the punch and the die, the remaining regions with the starting material sandwiched between the punch and the pad.

Abstract: A steel sheet suitable as a starting material for a vehicle impact absorbing member with high absorption of impact energy and resistance to cracking contains, by mass %, C: 0.08-0.30%, Mn: 1.5-3.5%; Si+Al: 0.50-3.0%, P: 0.10% or less, S: at most 0.010%, and N: at most 0.010%, and optionally, one or more types selected from Cr: at most 0.5%, Mo: at most 0.5% , B: at most 0.010%, Ti: less than 0.04%, Nb: less than 0.030%, V: less than 0.5%, Ca: at most 0.010%, Mg: at most 0.010%, REM: at most 0.050%, and Bi: at most 0.050%. The microstructure contains, by area %, bainite: more than 50%, martensite: 3-30%, and retained austenite: 3-15%, the remainder comprising ferrite having an average grain diameter of less than 5 mm. The product of uniform elongation and hole expansion ratio is at least 300%2 and 5% effective flow stress is at least 900 MPa.

Abstract: A producing method of the press formed product includes a preparation step of preparing a metal sheet as a starting material; and a press working step of performing press working on the starting material. The press working step includes: during a time period from when pushing-in of the starting material into the die by the punch is started or immediately thereafter until the pushing-in of the punch with respect to the die reaches a predetermined distance short of a bottom dead point for the pushing-in, holding the pad at a position distant from the punch by the predetermined distance; when the pushing-in of the punch with respect to the die reaches the predetermined distance short of the bottom dead point, receiving the pad in the die; and continuing the pushing-in of the punch with respect to the die and the pad to the bottom dead point.

Abstract: This automobile member has a closed cross section including joint portions in which edge portions of two side walls of an inner panel are joined with edge portions of two side walls of an outer panel, in which in a first region, a first region outer height ho1 and a first region inner height hi1 have a constant value and the difference between the first region outer height ho1 and the first region inner height hi1 is smaller than the difference between a second region outer height ho2 and a second region inner height hi2; in a second region, the second region outer height ho2 has a value which is larger than the second region inner height hi2 and constant, or the second region outer height ho2 has a value which is smaller than the second region inner height hi2 and constant; in a first transition region, a first transition region outer height ho1˜2 is continuously varied between the first region outer height ho1 and the second region outer height ho2, and a first transition region inner height hi1˜2 is contin

Abstract: An impact absorbing member 10 able to secure absorption energy while lightening weight by absorbing the impact load applied in the axial direction by periodic buckling, wherein the impact absorbing member 10 is provided with a main body 20 comprised of metal sheet and having a polygonal shape in cross-section vertical to an axial direction and a center sheet 30 comprised of metal sheet and provided at a hollow part in the main body along the axial direction, the polygonal shape of the main body 20 includes a pair of long side (20a, 20b) facing each other, the center sheet 30 is joined to each of the long sides (20a, 20b) of the polygonal shape of the main body 20, and the sheet thickness t1 (mm) of the main body 20 and the sheet thickness t2 (mm) of the center sheet 30 satisfy 1.3×t1?t2.

Abstract: A joining structure of the invention includes a first metal sheet and a pair of second metal sheets. Each of the pair of second metal sheets is overlapped on the first metal sheet in a state where an end surface of one of the second metal sheets and an end surface of the other second metal sheet face each other, and the end surfaces that face each other are integrally joined to the first metal sheet by means of a single mass of melted metal.

Abstract: [Object] To provide a model setting method of a finite element model used for forming simulation, which is capable of executing forming simulation of a metal plate highly accurately and efficiently. [Solution] Provided is a model setting method for setting a finite element model for simulating forming of a metal plate by a forming tool by using a finite element method, by a processor included in a computer, the model setting method including: in setting a forming tool model that represents the forming tool, setting at least a part of a metal plate contacting surface that contacts the metal plate, in the forming tool model, as a surface layer that has characteristics of an elastic body or an elasto-plastic body; and setting a part that supports the surface layer in the forming tool model, as a base body that has characteristics of a rigid body.

Abstract: A main body (2) has door attaching portions respectively formed on both end sides of a long longitudinal direction thereof and a bending deformation generation portion (3) disposed between the door attaching portions, and the bending deformation generation portion (3) has a groove bottom portion (4), two edge line portions (5a, 5b), two vertical wall portions (6a, 6b), two curved portions (7a, 7b), and two flanges (8a, 8b). There is provided a bead (13) which is formed toward the longitudinal direction of the main body (2) in a part of the groove bottom portion (4) in a manner to project in a shape having a curved surface toward the outside of a cross-sectional shape of the bending deformation generation portion (3) so as to oppose an impact load acting on a door impact beam (1).

Abstract: A bulkhead, which is a press-formed product, includes a top plate part, side flange parts and corner flange parts. The side flange parts each extend from respective sides of the top plate part. The corner flange parts each extend from respective corner parts of the top plate part. The corner flange part connects the side flange parts to each other. In the corner flange part, a part having a minimum value of plate thickness is present in a central portion in a circumferential direction, and parts having a maximum value of the plate thickness are present on both sides thereof. A ratio of the maximum value and the minimum value is in a range of more than 1.0 to 1.6 or less.

Abstract: There is provided a welded structure that can reduce fractures at welded portions. The welded structure includes two or three steel sheets and a lapped portion in which the steel sheets are overlapped and joined by spot welding at a plurality of locations, the welded structure including a spot weld portion, and, when a diameter of a nugget is dng (mm), a tip diameter of an electrode used by the spot welding is d (mm), and an average thickness per steel sheet of the steel sheets at the lapped portion is tave (mm), the spot weld portion satisfies dng>d(tave)1/2 when 0.5 mm?tave<1.1 mm and dng>1.05d when 1.1 mm?tave?2.6 mm, in accordance with the average thickness tave (mm).

Abstract: Mechanical properties, in particular torsional rigidity and absorbed energy properties in axial crushing, of a joint structure body including a joint formed by joining members are further improved. Provided is a first member, a second member, an end of the second member being thrust against a surface of the first member, and a joint that joins the first member and the second member are included. The joint includes an end flange that is formed continuously along the end of the second member and of which at least one part overlaps the surface of the first member and a unit joint that joins the end flange and the first member. The end flange is formed continuously to at least one part of the end of the second member via a rising curved surface portion and the rising curved surface portion includes a wall-thickened portion of which a sheet thickness is made larger than a sheet thickness of the second member.

Abstract: There is provided a manufacturing apparatus and a manufacturing method for a stretch-formed product which can improve the yield of material in the stretch forming performed while clamping the blank by the lock beads.

Abstract: To provide a panel whose surface rigidity can be improved appropriately in accordance with a load. Provided is a panel including: a load point to which a load is applied from the outside; and a protrusion that protrudes from a surface of the panel and is formed continuously or discontinuously around the load point. The protrusion intersects, at a plurality of positions, each of a plurality of virtual straight lines extending radially from the load point.