Abstract: A computerized method to determine the best nesting of blanks in a strip in order to optimize the material usage and to determine the associated material usage. Solving the problem of material usage optimization involves at least three different variables (two rotation angles of the blanks and one transversal offset) and thus potentially involves optimizing the material usage function over a very large set of combinations. This leads to high computation times, which can be a serious hindrance to the implementation of the material usage optimization method. A computerized method to accelerate the computerized determination of the best blank nesting for material usage optimization and the associated material usage is also provided.

Abstract: A method for the computerized positioning of two blanks to be cut out in a longitudinally extending strip including the steps of determining the inner dimensions of each blank in the longitudinal direction, determining the distances in the longitudinal direction between the left side of blank A and the right side of blank B and conversely when the blanks are superimposed, and deducting the pitches between two neighbouring blanks A and B and two neighbouring blanks B and A. A method for the computerized scrap ratio calculation using the blank positioning method and a method for the computerized calculation of the material cost of the blanking operation using the scrap ratio calculation.

Abstract: A hot stamping die (2,3) including a die body (11) having a work face (9) which is in contact with a blank during the hot stamping operation, and at least one porous die portion (4) having a corresponding porous work face portion (7), the porous die body portion being in contact with a reservoir (6, 40), the reservoir (6, 40) containing a cooling medium (8), and the porous die body portion including a plurality of ejection channels (5) extending from the reservoir (6, 40) to the porous work face portion, wherein the ejection channels (5) are configured to eject the cooling medium (8) from the reservoir (6, 40) towards the porous work face portion (7) when the pressure on the cooling medium is increased above a threshold ejection pressure, and wherein the die (2,3) does not include any discharge channels to evacuate excess ejected coolant from the dies after hot stamping.

Abstract: A non-stamped prealloyed steel coil, sheet or blank includes a heat-treatable steel substrate covered by an alloyed precoating containing aluminum and iron, aluminum not being present as free aluminum; and an interdiffusion layer at an interface between the steel substrate and the precoating, with a thickness between 2 and 16 micrometers, the interdiffusion layer being a layer with an ?(Fe) ferritic structure, having Al and Si in solid solution.

Abstract: A process for manufacturing a non-stamped prealloyed steel coil, sheet or blank, comprising the following successive steps of: providing a non-stamped precoated steel coil, sheet or blank composed of a steel substrate covered by a precoating of aluminum, or aluminum-based alloy, or aluminum alloy, wherein the precoating thickness is comprised between 10 and 35 micrometers on each side of the steel coil, sheet or blank, then heating the non-stamped steel coil, sheet or blank in a furnace under an atmosphere containing at least 5% oxygen, up to a temperature ?1 comprised between 750 and 1000° C., for a duration t1 comprised between t1min and t1max, wherein: t1min=23500/(?1?729.5) and t1max=4.946×1041×?1?13.08, t1 designating the total duration in the furnace, ?1 being expressed in ° C.

Abstract: A computerized method to determine the aptitude of a metallic part to be manufactured by roll forming and to classify metallic parts into one of the following categories: roll-formable without modification, roll-formable with modifications, not roll-formable. It also provides for a computerized method to compute the roll forming direction of a part. It further provides a method for determining the aptitude to roll forming of a large set of parts, such as for example part of the set of parts making up an automotive vehicle. The purpose of the current invention is further to provide a manufacturing method for a metallic part.

Abstract: A manufacturing process of a press hardened coated part including providing a furnace containing N zones, each furnace zone being respectively heated at a setting temperature ?1F, ?2F, . . . ?iF, . . . , ?NF, including: providing a steel sheet with thickness th between 0.5 and 5 mm, the steel sheet covered by an aluminium alloy precoating with a thickness between 15 and 50 ?m, the emissivity coefficient being equal to 0.15(1+?), ? being between 0 and 2.4, then cutting the steel sheet to obtain a precoated steel blank, then placing the precoated steel blank in furnace zone 1 for a duration t1 between 5 and 600 s, wherein ?1F and t1 are such that: ?1Fmax>?1F>?1Fmin then transferring the precoated steel blank in the furnace zone 2 heated at a setting temperature ?2F=?1B and maintaining isothermally the precoated steel blank for a duration t2, then transferring the precoated steel blank in further zones (3, . . . i, . . . , N) of the furnace, so to reach a maximum blank temperature ?MB between 850° C.

Abstract: A process for manufacturing a non-stamped prealloyed steel coil, sheet or blank, comprising the following successive steps of: providing a non-stamped precoated steel coil, sheet or blank composed of a steel substrate covered by a precoating of aluminum, or aluminum-based alloy, or aluminum alloy, wherein the precoating thickness is comprised between 10 and 35 micrometers on each side of the steel coil, sheet or blank, then heating the non-stamped steel coil, sheet or blank in a furnace under an atmosphere containing at least 5% oxygen, up to a temperature ?1 comprised between 750 and 1000° C., for a duration t1 comprised between t1min and t1max, wherein: t1min=23500/(?1?729.5) and t1max=4.946×1041×?1?13.08, t1 designating the total duration in the furnace, ?1 being expressed in ° C.

Abstract: A manufacturing process of a press hardened coated part including providing a furnace containing N zones, each furnace zone being respectively heated at a setting temperature ?1F, ?2F, . . . ?iF, . . . , ?NF, implementing the following successive steps: providing a steel sheet with thickness th between 0.5 and 5 mm, the steel sheet covered by an aluminium alloy precoating with a thickness between 15 and 50 ?m, the emissivity coefficient being equal to 0.15(1+?), a being between 0 and 2.4, then cutting said steel sheet to obtain a precoated steel blank, then placing the precoated steel blank in furnace zone 1 for a duration t1 between 5 and 600 s, wherein ?1F and t1 are such that: ?1Fmax>?1F>?1Fmin with: ?1Fmax=(598+A eBt1+CeDt1) and ?1Fmin=(550+A? eB?t1+C?eD?t1), A, B, C, D, A?, B?, C?, D? being such that A=(762 e0.071 th?426 e?0.86 th) (1?0.345?), B=(?0.031 e?2.151 th?0.039 e?0.094 th) (1+0.191?), C=(394 e0.193 th?434.3 e?1.797 th) (1?0.364?), D=(?0.029 e?2.677 th?0.011 e?0.298 th) (1+0.