A press forming method for producing a saddle type final product comprises a first process of producing an intermediate product having a processing adjustment section, by cold press working against an ultrahigh tensile strength steel plate, to deform the side wall portions and flange portions at the both sides in the predetermined area, with the cross section of the top plate portion being maintained in a predetermined shape, and a second process of pressing at least the processing adjustment section, by cold press working against the intermediate product, with the cross section of the top plate portion being maintained in the predetermined shape. In at least one of the first process and second process, a processing target of the at least one process is bent in the direction opposite to the opening of the hat-shaped cross section, to produce the saddle type final product

A tribological testing simulator includes a base having a pair of catchers that clamp onto a specimen, a punch that is drawn through the specimen, and a plurality of sensors that take measurements of respective regions of the specimen. The sensors measure their respective regions of the specimen as it is drawn from an un-deformed state to a deformed state, and facilitate conducting a tensile strip friction test. In some embodiments, the catchers have flat inserts that facilitate conducting a strip stretch or draw test simultaneously with a tensile strip friction test. In other embodiments, the catchers include drawbead inserts that facilitate conducting a drawbead friction test simultaneously with a tensile strip friction test.

The invention relates to a vessel head (1) for a vessel (30), comprising: a vaulted dish area (2) having a vault radius R, a connecting contour (5) comprising in a first contour section (6) a first radius of curvature (r1) and in a second contour section (7), a second radius of curvature (r2), wherein the first radius of curvature (r1) is larger than the second radius of curvature (r2) and a knuckle area (3) surrounding the dish area (2) and tracing the connecting contour (5) is configured between the connecting contour (5) and the dish area (2) comprising, extending along the first contour section (6), a first knuckle section (10) having a first knuckle radius (r1k1) and a second knuckle section (12) having a second knuckle radius (r1k2). The invention further relates to a tool and a method of manufacturing such a vessel head (1).

The invention relates to a vessel head (1) for a vessel (30), comprising: a vaulted dish area (2) having a vault radius R, a connecting contour (5) comprising in a first contour section (6) a first radius of curvature (r1) and in a second contour section (7), a second radius of curvature (r2), wherein the first radius of curvature (r1) is larger than the second radius of curvature (r2) and a knuckle area (3) surrounding the dish area (2) and tracing the connecting contour (5) is configured between the connecting contour (5) and the dish area (2) comprising, extending along the first contour section (6), a first knuckle section (10) having a first knuckle radius (r1k1) and a second knuckle section (12) having a second knuckle radius (r1k2). The invention further relates to a tool and a method of manufacturing such a vessel head (1).

Provided are a press forming method capable of improving material yield while avoiding the risk of dimensional error increase at product forming sections in blank material when carrying out press forming, and a plate material expansion device used in this method. An end side of plate material for press forming is restricted by blank holding rollers, and pressure is applied to a middle location in the part that is restricted by a pressure roller. In this state, the plate material is transported in a rotating direction of the rollers being driven to continuously bend and extend the section receiving pressure. This bent and extended section is flattened with a flattening roller to obtain blank material wherein an end part is expanded.

Provided is a technology capable of suppressing an edge crack occurring due to stretch flange deformation without being constrained by a target pressed component shape. The technology includes two-stage cutting processing of, when it is estimated that there is concern about risk of occurrence of an edge crack due to stretch flange deformation on an edge of a material (1) to be pressed in press forming, performing twice cutting processing on an edge including at least a site where there is concern about risk of occurrence of the edge crack as pre-processing for press forming in which there is concern about risk of occurrence of the edge crack. In the two-stage cutting processing, cutting to form a partial, beam-shaped overhang portion at a position including a site where there is concern about risk of occurrence of the edge crack is performed in the first cutting and the overhang portion is cut in the second cutting.

A pressing technology for reducing tensile residual stress generated on a sheared edge face of a metal sheet after press forming in order to prevent occurrence of a delayed fracture on the sheared edge face. A pressed component manufacturing method for manufacturing a pressed component by press-forming a metal sheet having a sheared edge face includes a first press forming step in which it is estimated that tensile residual stress is generated in a direction along the sheared edge on a portion of the sheared edge face of the metal sheet after die release, in which the method includes, as a subsequent step to the first press forming step, a tensile residual stress relaxation step of bulging, in the sheet thickness direction, a region that includes at least a site on a sheared edge face where it is estimated that the tensile residual stress is generated.

A computer-implemented method for simulating and optimising a process of forming and assembling parts comprises simulating a forming process (2) by a forming simulation (20), thereby generating a sprung back part simulation model (30) corresponding to a reference geometry (10) of the at least one formed part (3); simulating an assembly process (4) by an assembly simulation (40), based on the sprung back part simulation model (30) of the at least one formed part (3), and generating an assembled sprung back part simulated model (50).

Therein, if the geometry of the assembled sprung back part simulated model (50) does not match the reference geometry (10), a compensated sprung back part geometry (60) is iteratively adapted, and the assembly simulation (40) based on this is repeated until the assembled sprung back part simulated model (50) matches the reference geometry (10), resulting in an optimised compensated sprung back part geometry (60). Based on this, the design of the parts and of tools for forming the parts is determined, and the parts and tools are manufactured.

A computer-implemented method serves for simulating and analysing an assembly of two or more formed sheet metal parts. It comprises simulating a forming process of each part by an approximate simulation (20), and then performing an assembly simulation (40). In order to allow for a quick iteration over different part geometries to assess the assembly, the approximate simulation (20) comprises based on a reference geometry (10) of each part, estimating the deformation of a sheet metal blank required to attain the reference geometry (10); based on this deformation, estimating stresses within the material of the formed part; based on these stresses, estimating the shape of the formed part in which these stresses are in equilibrium, and using this shape as result (31) of the approximate simulation.

Provided are a press formed component that does not easily cause wrinkling on a vertical wall portion of a curved portion in a component shape having an L-shape, a T-shape, or the like when viewed in a plan view and a method for manufacturing the same. A press formed component includes a top sheet portion, a vertical wall portion continuous to the top sheet portion, and a flange portion and also includes a curved portion in which when viewed in a plan view, at least a part of a boundary portion between the top sheet portion and the vertical wall portion is displaced to the vertical wall portion side and curved concavely toward a longitudinal direction. In a cross-sectional shape of the curved portion, an inclination angle θ [deg] of the vertical wall portion with respect to the top sheet portion satisfies the following expression: (1−sin θ)/cos θ>0.95.