WO2007017579A1 - Production of a metal part by means of hot pressing and part thus obtained - Google Patents
Production of a metal part by means of hot pressing and part thus obtained Download PDFInfo
- Publication number
- WO2007017579A1 WO2007017579A1 PCT/FR2006/001872 FR2006001872W WO2007017579A1 WO 2007017579 A1 WO2007017579 A1 WO 2007017579A1 FR 2006001872 W FR2006001872 W FR 2006001872W WO 2007017579 A1 WO2007017579 A1 WO 2007017579A1
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- Prior art keywords
- quenching
- contour
- blank
- determined
- zone
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
- C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
Definitions
- the present invention relates to a method of manufacturing metal parts having a shape and a predetermined external contour, by stamping, quenching and cutting a blank of quenching material, in particular of parts used in the automotive industry as structural and chassis parts .
- the blank is heated in an oven to a temperature suitable for austenitizing the steel, and is maintained at the required temperature for the time necessary for this austenitization. At this temperature, the coating alloy is combined with steel.
- the still hot blank is conveyed to a stamping press whose stamping tool is placed at a comparatively low temperature so as to provoke, in the stamping tool itself, a fast enough quenching of the blank to communicate to the stamping press.
- steel a final martensitic structure that will give the stamped part the desired mechanical properties.
- the stamping tool proceeds to its cutting according to a determined external contour to separate the stamped part and an external fall of the blank (clipping ).
- the device may comprise a single punch-die assembly, capable of practicing in a single stamping operation the shaping of the piece from the blank, accompanied by the quenching, and the cutting of the piece, or two punch sets.
- matrix on which the blank is successively placed and the first proceeds to the shaping of the piece accompanied by quenching, and the second to the trimming of the workpiece, or may further comprise between the stamping tool and the cutting tool, a heating means for annealing locally before cutting; this heating means may comprise a support adapted to receive the part and in which is integrated a heating means. This support may have a volume complementary to that of the part, or provide only positioning contact zones.
- the combination of quenching and cutting along the outer contour of the part leads, in a marginal zone of the part, along this contour, the development of stresses which can themselves lead to crack initiation, the development of which later is poorly controlled.
- the object of the present invention is to overcome this disadvantage.
- the present invention proposes to temporarily heat the blank or the part in said marginal zone.
- This temporary heating can be performed on the blank during stamping and before cutting to avoid quenching of the marginal area.
- FIG. 1 shows by way of example only a perspective view of a hot stamping punch, intended for the production of a motor vehicle centerfoot from an initially planar blank, of which one has also represented the silhouette while it is still positioned on the punch after stamping, that is to say after forming and cutting according to an outer peripheral contour.
- the central foot 1 has the general shape of an I, defined by a central portion 2, elongate in a longitudinal direction 3 intended to be oriented approximately vertically once the foot-medium 1 integrated into a body of automobile, and two longitudinally extreme parts 4, 5, elongated substantially in the same transverse direction 9, whose first is intended to fit on a chassis frame of the vehicle and to be secured to the beam while the second is intended to fit on a roof frame of the vehicle and to be secured to the roof frame.
- I defined by a central portion 2, elongate in a longitudinal direction 3 intended to be oriented approximately vertically once the foot-medium 1 integrated into a body of automobile, and two longitudinally extreme parts 4, 5, elongated substantially in the same transverse direction 9, whose first is intended to fit on a chassis frame of the vehicle and to be secured to the beam while the second is intended to fit on a roof frame of the vehicle and to be secured to the roof frame.
- the central portion 2 has the general shape of a longitudinal beam of cross section in ⁇ , defined by a longitudinal core 6, bordered by two longitudinal wings 7, themselves bordered by a flat longitudinal edge 8. A single wing 7 and a only flange 8 are visible in FIG.
- the longitudinally extreme portion 4 has an inverted U-section, perpendicular to the transverse direction 9, and this section is defined by a core 10 extending the core 6, a transverse wing 11 bordering the core 10 and having a free edge 12, oriented in the transverse direction 9, and two wing portions 13 which are located on either side of the central portion 2 in the transverse direction 9 and each of which is connected to one of the flanges 7 and has a flange 14 itself extending a corresponding flange 8, opposite the connection of the part 13 considered to the core 10 of part 4.
- the longitudinally extreme portion 5 has a S-shaped shape perpendicular to the transverse direction 9, defined by a core 15 to which the core 6 is connected longitudinally opposite its connection with the core 10, and which is oriented according to the transverse direction 9 and obliquely with respect to the longitudinal direction 3, by a wing 16 oriented in the direction 9 and offset with respect to the core 6 in one direction transverse 17 perpendicular to the directions 3 and 9 and from the flanges 8 and 14 to the cores 6 and 10, and by two flange portions 18 each of which extends one of the flanges 8.
- the inclination of the core 15 is such that it moves away longitudinally from the longitudinally end portion 4, flange portions 18 towards the flange 16, in the direction 17.
- the flange 16 Longitudinally opposite its connection to the core 15, the flange 16 has a free edge 19 oriented in the direction 9.
- the central foot 1 has three holes 21, 23 and 25.
- the hollow and raised shapes are obtained by stamping an initially flat or preformed blank (not shown) in a stamping tool comprising a punch 27, illustrated in FIG. 28 forming, substantially complementary shape of the recessed shape but which extends beyond the outer peripheral contour 42 to confer to the workpiece.
- the stamping tool also comprises a matrix which is simply shown schematically in FIG. 1 by an arrow 29 and which has a forming face, not shown, complementary to the raised shape of the central foot 1 to be produced. but presenting, as the face 8, dimensions greater than those of the contour 42 defined by the free edges 12, 19, 20.
- the matrix 29 has, along this contour 42, means (not shown) for cutting the blank, to disengage the foot-medium 1 at the end of stamping; in addition, the matrix 29 comprises perforation means for arranging the holes 21, 23, 25.
- the punch 27 and the die 29 are provided in known manner with respective circuits for the circulation of a cooling fluid to perform quenching of the blank.
- the punch 27 has, in its forming face 28, heating means, advantageously by induction, closely located in a manner that will now be described.
- the forming face 28 has a zone 31 which corresponds to this zone 30 and on which this zone 30 is applied during stamping.
- the punch 27 is provided, in its forming face 28, with an induction heating circuit 32, which thus extends in the form of a substantially closed loop all along the outer peripheral contour 42 of the foot-medium 1 to be manufactured so as to be capable of heating the marginal zone 30 thereof over the whole of this outer peripheral contour 42.
- the heating must remain sufficiently localized so as not to interfere with the quenching effect resulting, in the rest of the central foot 1, from the contact of the constituent blank of the latter with the forming face 28 of the punch 27 suitably cooled for this purpose .
- the punching and cutting are carried out by mutually bringing the punch 27 and the matrix 29 together, which conforms the blank to the required shape of the central foot 1 and cuts the latter along its outer peripheral contour 42.
- the quenching material of the blank then undergoes the required quenching by cooling itself abruptly in contact with the forming face 28, except that a temporary heating of the marginal zone 30 by the induction heating circuit, preferably carried out before the actual cut but after forming the blank, during the stamping thereof, avoids the quenching of this marginal area and thus avoids that the cutting results in the appearance, in this marginal area, constraints likely to generate break primers.
- the punch 27 and the matrix 29 are then separated from each other to release the finished foot-medium 1, which is released to route it to other manufacturing steps.
- the stamping tool comprises two separate punch-matrix assemblies, one of which performs shaping and quenching and the second cutting, it is the punch of the first set which is then equipped with temporary heating means. It is also possible to perform the temporary heating after the cutting and while the quenching material has been quenched as elsewhere, in which case the heating of the marginal zone has the effect of relaxing by localized annealing the stresses which could then appear at the cutting of the at least partially on a hardened material.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
FABRICATION D'UNE PIECE METALLIQUE PAR EMBOUTISSAGE A CHAUD ET PIECE OBTENUE MANUFACTURE OF A METALLIC PIECE BY HOT STAMPING AND PIECE OBTAINED
La présente invention concerne un procédé de fabrication de pièces métalliques ayant une forme et un contour extérieur déterminés, par emboutissage, trempe et découpe d'un flan en matériau trempant, notamment de pièces utilisées dans l'industrie automobile comme pièces de structure et de châssis.The present invention relates to a method of manufacturing metal parts having a shape and a predetermined external contour, by stamping, quenching and cutting a blank of quenching material, in particular of parts used in the automotive industry as structural and chassis parts .
Des techniques d'emboutissage sont décrites notamment dans les publications US 5 916 389, US 2003/0066582, US 4 010 969 et JP 2005 205416.Embossing techniques are described in particular in US 5,916,389, US 2003/0066582, US 4,010,969 and JP 2005 205416.
Pour réaliser une telle pièce, on part d'un flan réalisé au moins partiellement en un matériau dit « trempant », à savoir en acier susceptible d'être trempé, tel qu'un acier 22 MnB5 commercialisé sous la dénomination BTR 165 ou sous la dénomination « USIBOR 1500 », que l'on revêt avantageusement d'un alliage de silicate d'aluminium.To produce such a piece, it starts from a blank made at least partially of a so-called "quenching" material, namely steel that can be quenched, such as a steel MnB5 22 marketed under the name BTR 165 or under denomination "USIBOR 1500", which is advantageously coated with an aluminum silicate alloy.
Dans un premier temps, le flan est chauffé dans un four à une température propre à provoquer l' austénitisation de l'acier, et il est maintenu à la température requise pendant le temps nécessaire à cette austénitisation. Porté à cette température, l'alliage de revêtement s'allie à l'acier.Initially, the blank is heated in an oven to a temperature suitable for austenitizing the steel, and is maintained at the required temperature for the time necessary for this austenitization. At this temperature, the coating alloy is combined with steel.
Le flan encore chaud est convoyé vers une presse d'emboutissage dont l'outil d'emboutissage est placé à une température comparativement basse afin de provoquer, dans l'outil d'emboutissage lui-même, une trempe suffisamment rapide du flan pour communiquer à l'acier une structure finale martensitique qui conférera à la pièce emboutie les propriétés mécaniques recherchées.The still hot blank is conveyed to a stamping press whose stamping tool is placed at a comparatively low temperature so as to provoke, in the stamping tool itself, a fast enough quenching of the blank to communicate to the stamping press. steel a final martensitic structure that will give the stamped part the desired mechanical properties.
Simultanément à la mise en forme du flan ou, plus généralement, à la fin de cette mise en forme, l'outil d'emboutissage procède à sa découpe selon un contour extérieur déterminé pour séparer la pièce emboutie et une chute extérieure du flan (détourage) .Simultaneously with the shaping of the blank or, more generally, at the end of this shaping, the stamping tool proceeds to its cutting according to a determined external contour to separate the stamped part and an external fall of the blank (clipping ).
Le dispositif peut comporter un unique ensemble poinçon-matrice, propre à pratiquer en une seule opération d' emboutissage la mise en forme de la pièce à partir du flan, accompagnée de la trempe, et la découpe de la pièce, ou deux ensembles poinçon-matrice distincts, sur lesquels on place successivement le flan et dont le premier procède à la mise en forme de la pièce accompagnée de la trempe, et le deuxième au détourage de la pièce, ou peut encore comporter entre l'outil d'emboutissage et l'outil de découpe, un moyen de chauffage pour recuire localement avant la découpe ; ce moyen de chauffage peut comporter un support adapté pour recevoir la pièce et dans lequel est intégré un moyen de chauffage. Ce support peut avoir un volume complémentaire de celui de la pièce, ou fournir seulement des zones de contact de positionnement.The device may comprise a single punch-die assembly, capable of practicing in a single stamping operation the shaping of the piece from the blank, accompanied by the quenching, and the cutting of the piece, or two punch sets. matrix, on which the blank is successively placed and the first proceeds to the shaping of the piece accompanied by quenching, and the second to the trimming of the workpiece, or may further comprise between the stamping tool and the cutting tool, a heating means for annealing locally before cutting; this heating means may comprise a support adapted to receive the part and in which is integrated a heating means. This support may have a volume complementary to that of the part, or provide only positioning contact zones.
La conjonction de la trempe et de la découpe le long du contour extérieur de la pièce entraîne, dans une zone marginale de la pièce, longeant ce contour, le développement de contraintes qui peuvent elles-mêmes aboutir à des amorces de fissures, dont le développement ultérieur est mal maîtrisé. Le but de la présente invention est de remédier à cet inconvénient. A cet effet, la présente invention propose de réaliser un chauffage temporaire du flan ou de la pièce dans ladite zone marginale.The combination of quenching and cutting along the outer contour of the part leads, in a marginal zone of the part, along this contour, the development of stresses which can themselves lead to crack initiation, the development of which later is poorly controlled. The object of the present invention is to overcome this disadvantage. For this purpose, the present invention proposes to temporarily heat the blank or the part in said marginal zone.
Ce chauffage temporaire peut être réalisé sur le flan pendant l'emboutissage et avant la découpe pour éviter la trempe de la zone marginale .This temporary heating can be performed on the blank during stamping and before cutting to avoid quenching of the marginal area.
Ce chauffage temporaire peut être un recuit réalisé sur la pièce après la découpe pour détendre les contraintes qui ont pu apparaître au découpage. D'autres caractéristiques et avantages de ces différents aspects de la présente invention ressortiront de la description ci-dessous, relative à un exemple non limitatif de mise en œuvre, ainsi que des dessins annexés qui accompagnent cette description. La figure 1, unique, montre à titre d'exemple uniquement une vue en perspective d' un poinçon d'emboutissage à chaud, destiné à la réalisation d'un pied-milieu de véhicule automobile à partir d' un flan initialement plan dont on a également représenté la silhouette alors qu'il est encore positionné sur le poinçon après l'emboutissage, c'est-à-dire après le formage et le découpage selon un contour périphérique extérieur.This temporary heating can be annealing performed on the piece after cutting to relax the constraints that may have appeared in the cutting. Other features and advantages of these various aspects of the present invention will emerge from the description below, relating to a nonlimiting example of implementation, and the accompanying drawings accompanying this description. FIG. 1, unique, shows by way of example only a perspective view of a hot stamping punch, intended for the production of a motor vehicle centerfoot from an initially planar blank, of which one has also represented the silhouette while it is still positioned on the punch after stamping, that is to say after forming and cutting according to an outer peripheral contour.
Dans ce mode de réalisation, le pied-milieu 1 présente la forme générale d'un I, définie par une partie centrale 2, allongée suivant une direction longitudinale 3 destinée à être orientée approximativement verticalement une fois le pied-milieu 1 intégré à une carrosserie d'automobile, et deux parties longitudinalement extrêmes 4, 5, allongées sensiblement suivant une même direction transversale 9, dont la première est destinée à s'emboîter sur un longeron de châssis du véhicule et à être solidarisée avec ce longeron alors que la deuxième est destinée à s'emboîter sur un cadre de toit du véhicule et à être solidarisée avec ce cadre de toit.In this embodiment, the central foot 1 has the general shape of an I, defined by a central portion 2, elongate in a longitudinal direction 3 intended to be oriented approximately vertically once the foot-medium 1 integrated into a body of automobile, and two longitudinally extreme parts 4, 5, elongated substantially in the same transverse direction 9, whose first is intended to fit on a chassis frame of the vehicle and to be secured to the beam while the second is intended to fit on a roof frame of the vehicle and to be secured to the roof frame.
La partie centrale 2 présente la forme générale d'une poutre longitudinale de section transversale en Ω, définie par une âme longitudinale 6, bordée par deux ailes longitudinales 7, elles-mêmes bordées par un rebord longitudinal plat 8. Une seule aile 7 et un seul rebord 8 sont visibles à la figure 8.The central portion 2 has the general shape of a longitudinal beam of cross section in Ω, defined by a longitudinal core 6, bordered by two longitudinal wings 7, themselves bordered by a flat longitudinal edge 8. A single wing 7 and a only flange 8 are visible in FIG.
La partie longitudinalement extrême 4 présente une section en U inversé, perpendiculairement à la direction transversale 9, et cette section est définie par une âme 10 prolongeant l'âme 6, une aile transversale 11 bordant l'âme 10 et présentant un bord libre 12, orienté suivant la direction transversale 9, et par deux parties d' aile 13 qui sont situées de part et d' autre de la partie centrale 2 suivant la direction transversale 9 et dont chacune se raccorde à l'une des ailes 7 et présente un rebord 14 prolongeant lui-même un rebord 8 correspondant, à l'opposé du raccordement de la partie 13 considérée à l'âme 10 de la partie 4.The longitudinally extreme portion 4 has an inverted U-section, perpendicular to the transverse direction 9, and this section is defined by a core 10 extending the core 6, a transverse wing 11 bordering the core 10 and having a free edge 12, oriented in the transverse direction 9, and two wing portions 13 which are located on either side of the central portion 2 in the transverse direction 9 and each of which is connected to one of the flanges 7 and has a flange 14 itself extending a corresponding flange 8, opposite the connection of the part 13 considered to the core 10 of part 4.
La partie longitudinalement extrême 5 présente perpendiculairement à la direction transversale 9 une forme en S, définie par une âme 15 à laquelle l'âme 6 se raccorde longitudinalement à l'opposé de son raccordement avec l'âme 10, et qui est orientée suivant la direction transversale 9 et obliquement par rapport à la direction longitudinale 3, par une aile 16 orientée suivant la direction 9 et décalée par rapport à l'âme 6 dans un sens transversal 17 perpendiculaire aux directions 3 et 9 et allant des rebords 8 et 14 vers les âmes 6 et 10, et par deux parties de rebord 18 dont chacune prolonge l'un des rebords 8. L'inclinaison de l'âme 15 est telle que celle-ci s'éloigne longitudinalement de la partie longitudinalement extrême 4, des parties de rebord 18 vers l'aile 16, dans le sens 17. Longitudinalement à l'opposé de son raccordement à l'âme 15, l'aile 16 présente un bord libre 19 orienté suivant la direction 9. Les bords libres transversaux 12 et 19 des ailesThe longitudinally extreme portion 5 has a S-shaped shape perpendicular to the transverse direction 9, defined by a core 15 to which the core 6 is connected longitudinally opposite its connection with the core 10, and which is oriented according to the transverse direction 9 and obliquely with respect to the longitudinal direction 3, by a wing 16 oriented in the direction 9 and offset with respect to the core 6 in one direction transverse 17 perpendicular to the directions 3 and 9 and from the flanges 8 and 14 to the cores 6 and 10, and by two flange portions 18 each of which extends one of the flanges 8. The inclination of the core 15 is such that it moves away longitudinally from the longitudinally end portion 4, flange portions 18 towards the flange 16, in the direction 17. Longitudinally opposite its connection to the core 15, the flange 16 has a free edge 19 oriented in the direction 9. The transverse free edges 12 and 19 of the wings
11 et 16 sont raccordés entre eux par deux autres bords libres longitudinaux 20.11 and 16 are interconnected by two other longitudinal free edges 20.
Les bords libres 12, 19 et 20 constituent ensemble le contour périphérique extérieur 42 du pied- milieu 1.The free edges 12, 19 and 20 together constitute the outer peripheral contour 42 of the mid-foot 1.
Dans l'exemple réprésenté, le pied-milieu 1 comporte trois trous 21, 23 et 25.In the example shown, the central foot 1 has three holes 21, 23 and 25.
De façon connue en soi, les formes en creux et en relief sont obtenues par emboutissage d' un flan initialement plan ou préformé (non illustré) , dans un outil d'emboutissage comportant un poinçon 27, illustré à la figure 1, présentant une face 28 de formage, de forme sensiblement complémentaire de la forme en creux mais qui s'étend au-delà du contour périphérique extérieur 42 à conférer à la pièce à fabriquer.In a manner known per se, the hollow and raised shapes are obtained by stamping an initially flat or preformed blank (not shown) in a stamping tool comprising a punch 27, illustrated in FIG. 28 forming, substantially complementary shape of the recessed shape but which extends beyond the outer peripheral contour 42 to confer to the workpiece.
L'outil d'emboutissage comporte par ailleurs une matrice que l'on a simplement schématisée à la figure 1 par une flèche 29 et qui présente une face de formage, non illustrée, complémentaire de la forme en relief du pied-milieu 1 à réaliser mais présentant, comme la face de formage 8, des dimensions supérieures à celles du contour 42 défini par les bords libres 12, 19, 20.The stamping tool also comprises a matrix which is simply shown schematically in FIG. 1 by an arrow 29 and which has a forming face, not shown, complementary to the raised shape of the central foot 1 to be produced. but presenting, as the face 8, dimensions greater than those of the contour 42 defined by the free edges 12, 19, 20.
D'une façon préférée, la matrice 29 présente, le long de ce contour 42, des moyens (non représentés) de découpage du flan, pour en dégager le pied-milieu 1 en fin d'emboutissage ; en outre, la matrice 29 comporte des moyens de perforation, pour aménager les trous 21, 23, 25.In a preferred manner, the matrix 29 has, along this contour 42, means (not shown) for cutting the blank, to disengage the foot-medium 1 at the end of stamping; in addition, the matrix 29 comprises perforation means for arranging the holes 21, 23, 25.
Le poinçon 27 et la matrice 29 sont munis de façon en soi connue de circuits respectifs pour la circulation d'un fluide de refroidissement pour réaliser une trempe du flan.The punch 27 and the die 29 are provided in known manner with respective circuits for the circulation of a cooling fluid to perform quenching of the blank.
Selon l'invention, le poinçon 27 présente, dans sa face de formage 28, des moyens de chauffage, avantageusement par induction, étroitement localisés d'une manière qui va être décrite à présent.According to the invention, the punch 27 has, in its forming face 28, heating means, advantageously by induction, closely located in a manner that will now be described.
En particulier, si l'on considère une zone marginale 30 du pied-milieu 1 longeant le contour périphérique extérieur 42 sur la totalité de celui-ci, de façon continue, sur une largeur pouvant aller jusqu'à quelques millimètres, la face de formage 28 présente une zone 31 qui correspond à cette zone 30 et sur laquelle cette zone 30 s'applique lors de l'emboutissage.In particular, if we consider a marginal zone 30 of the central foot 1 along the outer peripheral contour 42 over all of it, continuously, over a width of up to a few millimeters, the forming face 28 has a zone 31 which corresponds to this zone 30 and on which this zone 30 is applied during stamping.
Dans cette zone 31, le poinçon 27 est muni, dans sa face de formage 28, d'un circuit 32 de chauffage par induction, qui s'étend ainsi sous forme d'une boucle pratiquement fermée tout au long du contour périphérique extérieur 42 du pied-milieu 1 à fabriquer de façon à être susceptible de chauffer la zone marginale 30 de celui-ci sur la totalité de ce contour périphérique extérieur 42. Le chauffage doit rester suffisamment localisé pour ne pas nuire à l'effet de trempe résultant, dans le reste du pied-milieu 1, du contact du flan constitutif de celui-ci avec la face de formage 28 du poinçon 27 convenablement refroidi à cet effet.In this zone 31, the punch 27 is provided, in its forming face 28, with an induction heating circuit 32, which thus extends in the form of a substantially closed loop all along the outer peripheral contour 42 of the foot-medium 1 to be manufactured so as to be capable of heating the marginal zone 30 thereof over the whole of this outer peripheral contour 42. The heating must remain sufficiently localized so as not to interfere with the quenching effect resulting, in the rest of the central foot 1, from the contact of the constituent blank of the latter with the forming face 28 of the punch 27 suitably cooled for this purpose .
On procède à l'emboutissage et à la découpe en rapprochant mutuellement le poinçon 27 et la matrice 29, ce qui conforme le flan à la forme requise du pied-milieu 1 et découpe ce dernier le long de son contour périphérique extérieur 42.The punching and cutting are carried out by mutually bringing the punch 27 and the matrix 29 together, which conforms the blank to the required shape of the central foot 1 and cuts the latter along its outer peripheral contour 42.
Le matériau trempant du flan subit alors la trempe requise en se refroidissant brutalement au contact de la face de formage 28, si ce n'est qu'un chauffage temporaire de la zone marginale 30 par le circuit de chauffage par induction, pratiqué de préférence avant la découpe proprement dite mais après la mise en forme du flan, pendant l'emboutissage de celui-ci, évite la trempe de cette zone marginale et évite ainsi que le découpage se traduise par l'apparition, dans cette zone marginale, de contraintes susceptibles de générer des amorces de ruptures .The quenching material of the blank then undergoes the required quenching by cooling itself abruptly in contact with the forming face 28, except that a temporary heating of the marginal zone 30 by the induction heating circuit, preferably carried out before the actual cut but after forming the blank, during the stamping thereof, avoids the quenching of this marginal area and thus avoids that the cutting results in the appearance, in this marginal area, constraints likely to generate break primers.
Le poinçon 27 et la matrice 29 sont alors séparés l'un de l'autre pour libérer le pied-milieu 1 terminé, que l'on dégage pour l'acheminer vers d'autres étapes de fabrication.The punch 27 and the matrix 29 are then separated from each other to release the finished foot-medium 1, which is released to route it to other manufacturing steps.
Lorsque l'outil d'emboutissage comporte deux ensembles poinçon-matrice distincts, dont un premier effectue la mise en forme et la trempe et le deuxième le découpage, c'est le poinçon du premier ensemble qui est alors équipé des moyens de chauffage temporaire. On peut également pratiquer le chauffage temporaire après la découpe et alors que le matériau trempant a subi la trempe comme partout ailleurs, auquel cas le chauffage de la zone marginale a pour effet de détendre par recuit localisé les contraintes qui ont pu alors apparaître au découpage du fait qu'il s'effectuait au moins partiellement sur un matériau trempé.When the stamping tool comprises two separate punch-matrix assemblies, one of which performs shaping and quenching and the second cutting, it is the punch of the first set which is then equipped with temporary heating means. It is also possible to perform the temporary heating after the cutting and while the quenching material has been quenched as elsewhere, in which case the heating of the marginal zone has the effect of relaxing by localized annealing the stresses which could then appear at the cutting of the at least partially on a hardened material.
Ce chauffage temporaire peut s'effectuer encore entre l'outil d'emboutissage et l'outil de découpe. II est bien entendu que le choix de la fabrication d' un pied-milieu 1 ne constitue qu' un exemple non limitatif. This temporary heating can be performed again between the stamping tool and the cutting tool. It is understood that the choice of the manufacture of a foot-medium 1 is only a non-limiting example.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0508369A FR2889466B1 (en) | 2005-08-05 | 2005-08-05 | MANUFACTURE OF A METALLIC PIECE BY HOT STAMPING AND PIECE OBTAINED |
| FR0508369 | 2005-08-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2007017579A1 true WO2007017579A1 (en) | 2007-02-15 |
Family
ID=36293416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2006/001872 Ceased WO2007017579A1 (en) | 2005-08-05 | 2006-08-02 | Production of a metal part by means of hot pressing and part thus obtained |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR2889466B1 (en) |
| WO (1) | WO2007017579A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2367962B1 (en) | 2008-12-19 | 2015-07-29 | voestalpine Metal Forming GmbH | Method for producing partially hardened components from sheet steel |
| EP2366805B1 (en) | 2010-03-12 | 2015-10-14 | Benteler Automobiltechnik GmbH | Method for manufacturing press hardened components |
| WO2024086500A1 (en) * | 2022-10-18 | 2024-04-25 | Martinrea International US Inc. | Process for heat treating portions of a steel article and assembly for forming a steelsheet article |
| WO2024091920A1 (en) * | 2022-10-24 | 2024-05-02 | Martinrea International US Inc. | Process for heat treating portions of a steel article and assembly for forming a steelsheet article |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2175041A1 (en) * | 2008-10-09 | 2010-04-14 | C.R.F. Società Consortile per Azioni | Method of hot forming metal plates |
| CN105188980B (en) * | 2013-03-21 | 2017-03-15 | 新日铁住金株式会社 | The manufacture method of press-formed part and press molding equipment |
| DE102014109773A1 (en) | 2014-07-11 | 2016-01-14 | Thyssenkrupp Ag | Method for producing a press-hardened component |
| DE102017128742A1 (en) | 2017-12-04 | 2019-06-06 | Benteler Automobiltechnik Gmbh | Method and press tool for producing a metallic mold component |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4010969A (en) * | 1973-05-17 | 1977-03-08 | Houdaille Industries, Inc. | Impact resistant lightweight, low cost automobile bumpers and method of making same |
| US5916389A (en) * | 1996-06-07 | 1999-06-29 | Ssab Hardtech Ab | Method of producing a sheet steel product such as a reinforcement element in a larger structure |
| JP2005205416A (en) * | 2004-01-20 | 2005-08-04 | Nissan Motor Co Ltd | Hot press molding method and hot press mold |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19743802C2 (en) * | 1996-10-07 | 2000-09-14 | Benteler Werke Ag | Method for producing a metallic molded component |
| DE10149221C1 (en) * | 2001-10-05 | 2002-08-08 | Benteler Automobiltechnik Gmbh | Process for producing a hardened sheet metal profile |
-
2005
- 2005-08-05 FR FR0508369A patent/FR2889466B1/en not_active Expired - Lifetime
-
2006
- 2006-08-02 WO PCT/FR2006/001872 patent/WO2007017579A1/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4010969A (en) * | 1973-05-17 | 1977-03-08 | Houdaille Industries, Inc. | Impact resistant lightweight, low cost automobile bumpers and method of making same |
| US5916389A (en) * | 1996-06-07 | 1999-06-29 | Ssab Hardtech Ab | Method of producing a sheet steel product such as a reinforcement element in a larger structure |
| JP2005205416A (en) * | 2004-01-20 | 2005-08-04 | Nissan Motor Co Ltd | Hot press molding method and hot press mold |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2367962B1 (en) | 2008-12-19 | 2015-07-29 | voestalpine Metal Forming GmbH | Method for producing partially hardened components from sheet steel |
| EP2367962B2 (en) † | 2008-12-19 | 2018-07-18 | voestalpine Metal Forming GmbH | Method for producing partially hardened components from sheet steel |
| EP2366805B1 (en) | 2010-03-12 | 2015-10-14 | Benteler Automobiltechnik GmbH | Method for manufacturing press hardened components |
| WO2024086500A1 (en) * | 2022-10-18 | 2024-04-25 | Martinrea International US Inc. | Process for heat treating portions of a steel article and assembly for forming a steelsheet article |
| WO2024091920A1 (en) * | 2022-10-24 | 2024-05-02 | Martinrea International US Inc. | Process for heat treating portions of a steel article and assembly for forming a steelsheet article |
| US12138678B2 (en) | 2022-10-24 | 2024-11-12 | Martinrea International US Inc. | Tailor hardening of such as a cold stamped vehicle door pillar using advanced high strength steel to exhibit each of hard, transition and soft zones |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2889466A1 (en) | 2007-02-09 |
| FR2889466B1 (en) | 2008-12-19 |
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