EP0523215B1 - Procede et dispositif de formage hydrostatique de corps creux en metal deformable a froid - Google Patents

Procede et dispositif de formage hydrostatique de corps creux en metal deformable a froid Download PDF

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Publication number
EP0523215B1
EP0523215B1 EP92903582A EP92903582A EP0523215B1 EP 0523215 B1 EP0523215 B1 EP 0523215B1 EP 92903582 A EP92903582 A EP 92903582A EP 92903582 A EP92903582 A EP 92903582A EP 0523215 B1 EP0523215 B1 EP 0523215B1
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EP
European Patent Office
Prior art keywords
pressure
hollow body
deformation
bushing
die
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP92903582A
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German (de)
English (en)
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EP0523215A1 (fr
Inventor
Wilhelm Kaiser
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hde Metallwerk GmbH
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hde Metallwerk GmbH
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Publication of EP0523215A1 publication Critical patent/EP0523215A1/fr
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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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/045—Closing or sealing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
    • B21C37/283—Making U-pieces
    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49805—Shaping by direct application of fluent pressure

Definitions

  • the invention relates to a method for the hydrostatic shaping of hollow bodies made of cold-formable metal beyond the clear initial width of the hollow body within a mold cavity of a die, pressure fluid being fed into the hollow body from the outside, a deformation region of the hollow body being moved relative to the mold cavity only by means of the pressure fluid and the hollow body wall is pressed onto the engraving of the mold cavity and the hollow body is received outside of the deformation area in at least one support or pressure fluid-conducting connection area of at least one rigid sleeve essentially free of axial force and axially displaceable with a sliding fit.
  • the aforementioned method which is known from NL-C-80 878, deals with the production of elbows from thin-walled, metallic tubes of circular cross-section, and thus relates in the broadest sense to a bending method for such tubes.
  • the peculiarity of that known method is first of all to reduce the axial compression pressure (and thus the formation of folds) when bending on the inside of the neutral fiber to a negligibly small value in that the tube walls are pressed tightly against one another via the bending path, that is to say the tube is flattened is (see NL-C-80 878 column 1, lines 39-50, and column 2, lines 1-9, in connection with Figs. 1-6).
  • a calibration is then carried out in the die under hydrostatic internal pressure, in which a pipe end is anchored in the die, while the inlet end of the pipe for the hydraulic medium is given the opportunity to freely slide back and forth in the die.
  • the purpose of this calibration work is obviously to restore the tube diameter reduced by the mechanical bending process as a result of stretching and at the same time to press the outer curvature of the tubular workpiece exactly against the die engraving (see NL-C-80 878 column 4, lines 16-41).
  • the NL-C-80 878 therefore essentially only shows a precision bending process with which Pipe bends (for example for musical wind instruments) can be produced without falsifying the cross-sectional shape (for example circular shape) of the starting tubular body.
  • the tubular workpiece is provided on the inside and outside of the pipe with protuberances that are placed in such a way that two separating cuts made through the protuberances result in a 90 ° elbow with a short and a long elbow end.
  • the method according to GB-A-835 259 is felt to be disadvantageous because the achievable degree of expansion of the hollow body is too small and that according to Expansion of wall thickness can be felt as random.
  • the known hydroforming process is always limited to workpieces in which the force-action lines for the introduction of the axial forces, that is to say the ram and the longitudinal central axis of the tube, coincide exactly.
  • the longitudinal axis of the protuberance which is produced sectorally in accordance with the die engraving, runs transversely to the force line of the press ram and the pipe (see "Industrial Indicator", see page 17, Figures 4 and 8).
  • connection area for supplying the hydrostatic pressure fluid is formed by an opening (see Fig. 2.2. A) and c) position p) of a housing surrounding the die.
  • the die has two seals integrated in both die halves, which encompass the two pipe ends in order to avoid hydraulic pressure compensation. It should therefore be prevented that hydrostatic pressure fluid can creep around the outside of the tubular workpiece to be deformed. During the hydrostatic forming, the tubular workpiece can move axially relative to the two seals.
  • EP-A3-03 47 369 describes a method with which a more or less theoretical attempt is made to deform hollow bodies solely under the action of the pressure medium and also to produce curved moldings.
  • each rigid sleeve has a closed toroidal hollow seal on the inside, which is always subjected to a sealing pressure which is considerably 10-20% higher than the forming pressure acting on the hollow profile on the inside (cf. EP -A3-03 47 369 column 2, lines 44-49, column 3, lines 51-58, and column 4, lines 42-64).
  • the invention is based on the object of specifying a hydrostatic expansion method, which, irrespective of the course of the longitudinal axis of the tubular workpiece, permits a greater degree of expansion than before, and at the same time allows targeted wall thickness control.
  • this object has been achieved in that the hollow body wall is accommodated at each support and connection area essentially free of axial force and axially displaceably with a sliding fit in the sleeve, and in that at the points at which a hydrostatic thinning of the hollow body wall is to be produced, specifically Distance between the outer surface of the hollow body wall and the inner surface of the engraving is left and that the distance is dimensioned essentially proportional to the degree of deformation to be achieved.
  • the hollow body is accommodated at each support or connection area essentially free of axial force and axially displaceable with a sliding fit in the sleeve.
  • the invention first of all creates the precondition for the production of hollow bodies of any basic shape, including those with an arbitrarily curved, intricate shape.
  • the invention uses the exclusive sliding seat mounting of the workpiece for the possibility of a large degree of expansion, since a sufficient amount of material can flow into the actual forming zone during the hydrostatic forming.
  • the method according to the invention also allows wall thickness control.
  • This is according to the invention achieved that at the points at which a hydrostatic thinning of the hollow body wall is to be generated, a distance is left between the outer surface of the hollow body wall and the inner surface of the engraving, the distance being dimensioned essentially proportional to the degree of deformation to be achieved.
  • the invention accordingly deliberately places the movement of the hollow body wall relative to the die that occurs during the forming process in a dependence on the desired thickness of the hollow body wall.
  • the movement of the hollow body wall relative to the die should be understood to mean any movement of any point on the hollow body wall relative to the engraving of the mold cavity.
  • the residual wall thickness between the outer and inner bends of a pre-bent pipe blank is automatically compensated for by the fact that the hydrostatic pressure, due to the larger effective area in the outer bend, leads to the blank initially engaging the engraving in the area of the outer bend.
  • the thicker wall of the inner arch is then pressed against the engraving opposite the inner arch, due to the higher pressure over time. This is basically done in such a way that each inner radius can be chosen freely and at the same time the remaining wall thickness is minimized.
  • the hydrostatic shaping in each die takes place in such a way that, before the hydrostatic shaping begins, the hydraulic fluid is first introduced into the hollow body with a filling pressure and then the fluid pressure is increased to a forming pressure whose pressure level is a multiple of the filling pressure.
  • the height of the forming pressure can be approximately 30 to 50 times the level of the filling pressure.
  • An essential aim of the method according to the invention is to be able to produce hollow bodies with a high manufacturing identity precisely. It is important here that the material always lies precisely against the engraving of the mold cavity during the forming process, even if there are partial material tolerances.
  • a development of the invention provides that the forming pressure required for forming a hollow body is increased by an additional pressure.
  • the invention therefore works with a pressure reserve. For example, if a forming pressure of 1350 bar would suffice for forming a hollow body, the invention provides for an increase in pressure to, for example, 1500 bar.
  • the additional pressure of 150 bar ensures that the wall of the hollow body always lies evenly, richly and without resetting against the engraving of the mold cavity.
  • a special feature of the method according to the invention is that during the hydrostatic shaping, the air previously located in the hollow body is preferably compressed at the same time by means of the pressure fluid, that after the shaping has been completed, the pressure supply for the pressure fluid is switched off, whereupon the compressed air relaxes and the pressure fluid thereby expires is pushed out of the hollow body.
  • an embodiment of the invention provides that after each completed transformation stage, for example within a separate die, before the subsequent separate forming in the next die, the hollow body is recrystallized by normalizing .
  • the Temperature for normalizing or normalizing about 920-930 ° C.
  • the invention also includes a purely mechanical intermediate forming in the event that the basic shape would have to be changed in a conspicuous manner after hydrostatic forming has already taken place.
  • each sleeve is translationally movable back and forth relative to the die is, and that each sleeve for receiving a respective support or connection area of the hollow body forms an encompassing sliding seat.
  • the pressure-tight reception of each support or connection area on the hollow body side ensures that the hollow body as a whole is kept essentially free of axial force.
  • This axial force-free sliding seat posture ensures in a particularly advantageous manner that the deformation area on the hollow body side can deform both axially and radially under the action of the hydrostatic internal pressure within the die in the manner of a stretching deformation and in this case automatically "pull" material out of the holding areas.
  • a schematically partially illustrated hydrostatic forming device is designated overall by the reference number 10.
  • the forming device 10 has a press 11 with a fixed press table 12 and a press upper part 13 which can be moved up and down in accordance with the double arrow denoted by y, on the lower surface of which a die upper part 14 of a die 16 is fastened in a uniform movement.
  • the die 16 also has a lower die part (lower die) 15.
  • a mold cavity half 18 of the upper die 14 and a mold cavity half 19 of the lower die 15 complement each other to form a mold cavity 17.
  • the surface forming the inner surface of the mold cavity 17, that is to say the engraving, is generally designated by the reference number 20.
  • the die 17 is delivered by moving the upper press part 13 downward.
  • a tube (tubular hollow body) 21 is received, which is made of a cold-formable metal, e.g. consists of St 34 or St 38 or another suitable formable material.
  • the tube 21, hereinafter referred to as a tubular hollow body regardless of its degree of deformation, is provided with a tube plate 22 on its one end face in the exemplary embodiment according to FIG. 1, while an open end face 23 is present at the other end.
  • the tubular hollow body 21 has end faces 23 which are open at both ends.
  • the feed sleeve 24 is translationally movable back and forth along the double arrow denoted by x.
  • the feed sleeve 24 sealingly encompasses the support or connection region 26 of the tubular hollow body 21 with a grooved collar 27 the feed sleeve 24 is blocked with respect to its direction of movement x, so that hydraulic fluid can be introduced from a hydraulic fluid source, not shown, via the feed lines 28, 29 into the sleeve cavity 30 and then can be introduced into the tubular hollow body via the respective open end face 23.
  • the tubular hollow body 21 is deformed in such a way that it rests on the engraving 20 of the die 16 with plastic deformation and thus assumes the contour of the engraving.
  • the tubular hollow body 21 is identified by dashed subdivisions T, which are intended to distinguish fundamentally from the fact that the tubular hollow body 21 consists of a support or connection area 26 and a deformation area 31.
  • tubular hollow body according to FIG. 1 is provided with the bottom 22 on one end face, only one supporting or connecting region 26 cooperating with the feed sleeve 24 is consequently provided, whereas in the case of a tubular hollow body 21 which is open at both ends (at 23), the deformation region 31 has both ends is limited by support or connection areas 26 corresponding to the dashed lines T shown in dashed lines.
  • both feed sleeves 24 are moved towards each other in synchronism before the hydrostatic shaping by means of the pressure fluid, whereupon the pressure fluid can be introduced via both feed sleeves 24.
  • an analog blind sleeve which is pressure-tightly sealed to the outside and therefore, with its grooved collar 27, encompasses the support or connection area 26 shown on the left in FIG. 2 and thus can at least assume the function of the tube sheet 22 according to FIG. 1. Except for its pressure-tight seal, a blind sleeve 24 does not differ from the feed sleeve 24.
  • the feed sleeve 24 has a sleeve body 32 with an external thread 34, which interacts with the internal thread 33 of a union nut 35.
  • the union nut 35 is provided with an insertion opening 36 which is delimited by a truncated cone-shaped inner surface 37.
  • the continuously ring-shaped ring nut 27 made of a flexible material, in particular of largely dimensionally stable plastic, is inserted.
  • the grooved collar 27 has an annular groove 40 which is open backwards in the direction of the pressure medium supply and which is delimited on the inside by an annular lip 42 which is integrally integrally connected to the grooved collar 27 and on the outside by an annular lip 41 which is also integrally integral component of the grooved collar 27.
  • the grooved collar 27 can therefore automatically expand in a gap-sealing manner under the action of the hydraulic fluid.
  • the feed sleeve 24 moves to the left along the direction x and continues to move via the intermediate position shown in dash-dotted lines until the union nut 35 lies snugly overall in the die-side receiving cavity 25. In this case, the grooved collar 27 passes over the support or connection area 26. Then the feed sleeve 24 is blocked with respect to the direction of movement x, whereupon a pressure medium (expediently an aqueous emulsion which is suitable for Hydraulic purposes is suitable) is introduced into the interior 43 of the tubular hollow body 21, after which its expanding hydrostatic deformation, which is a stretching deformation, takes place.
  • a pressure medium expediently an aqueous emulsion which is suitable for Hydraulic purposes is suitable
  • the tubular hollow body 21 shown in FIG. 4 is bent to a pipe bend of 180 ° by means of a conventional pipe bending device, not shown.
  • the pipe bending device can work, for example, according to the principle set out in AT-A-272 072.
  • the tube 21 behaves differently along its neutral axis (longitudinal central axis).
  • a thickening 45 caused by compression occurs in the inner wall area and a certain thinning 46 of the hollow body wall, designated overall by 47, in the outer tube wall area.
  • the bend results in a longitudinal groove-like sinking point 48 extending along the longitudinal direction of the tube.
  • a part of the lower die 15 is shown, which represents a plan view of the die division plane E.
  • the area of the die division plane is marked with an oblique line for better emphasis.
  • the pipe bend 21 is inserted into the lower mold cavity half 19 from above. Then the die 16 is delivered analogously to the representations in FIGS. 1 and 2 and two feed sleeves 24, not shown, slide over the two support or connection areas 26 of the pipe bend 21, the end faces 23 of which are open. The two feed sleeves 24, of which a blind sleeve can be, are then blocked against displacement. The arrangement is now ready to introduce the hydrostatic pressure fluid.
  • the hydrostatic pressure fluid is introduced in accordance with the pressure curve shown in FIGS. 10 and 11. 10, the pressure acting in the interior 43 of the tubular hollow part 21 to be deformed is plotted over time. 11 shows an enlarged detail of the pressure curve according to FIG. 10.
  • the pipe bend 21 according to FIG. 4 is first subjected to a filling pressure which, according to FIG. 11, reaches a pressure level of approximately 65 bar.
  • a filling pressure which, according to FIG. 11, reaches a pressure level of approximately 65 bar.
  • the filling pressure is generated in a separate low pressure section.
  • the filling pressure is increased by a steeply increasing forming pressure (generated in a separate high-pressure part), the maximum of which in the present case is approximately 1500 bar, but in principle up to 3000 bar and higher can be increased.
  • the pipe bend 21 is drawn completely into the mold cavity 17 along the direction A, the longitudinal groove-like incidence point 48 (see FIG. 4a) initially moving to the position 20 A of the engraving 20 outwards.
  • the pipe cross section assumes approximately the shape shown in FIG. 5a.
  • Fig. 5 clearly shows that the outer surface of the pipe bend has already largely applied to the engraving 20 at 20 A.
  • the dashed subdivisions T are also entered, which are intended to differentiate approximately the support or connection regions 26 from the deformation region 31 of the pipe bend 21.
  • FIGS. 4-6 only reproduce the entire forming process in stages, which overall runs continuously smoothly and without stagnation.
  • the increasing forming pressure finally ensures that the tube wall 47 located in the deformation area 31 fits snugly against the engraving 20, with an expansion of the tube 21 with simultaneous stretching of the tube wall 47.
  • the thickening 45 which can still be clearly seen in FIGS. 5 and 5a, bears against the direction A, namely in direction B, against the inner engraving region 20B with simultaneous stretching deformation, while the outer pipe bend is being applied overall on the outer contour of the engraving 20, so also at 20 A.
  • the tube 21 thus transformed finally has a uniform ring cross section corresponding to FIGS. 6 and 6a.
  • the tube bend 21 due to the larger effective area in the outer bend area, the tube bend 21 first moves in direction A into the mold cavity and is supported on the engraving area 20A. The thicker wall area 45 of the inner sheet is then pressed against the engraving area 20B opposite the inner sheet (at 45), due to the higher pressure in accordance with FIGS. 10 and 11 over time. It is therefore clear that, overall, the remaining wall thickness of the hollow body wall 47 is automatically compensated. This is basically done in such a way that each inner radius (ie in the area of the inner pipe bend, see also Fig. 8 Item 49) can be freely selected and at the same time the remaining wall thickness can be minimized.
  • a maximum forming pressure of approximately 1350 bar would have been sufficient.
  • the sufficient forming pressure is e.g. 150 bar increased to 1500 bar.
  • FIGS. 7-9 similarly to FIGS. 4-6, the cutting lines designated IVa-IVa, Va-Va and VIa-VIa are also entered, so that in principle also for the representations according to FIGS. 7-9-bis to scale differences - essentially the cross-sections according to FIGS. 4a, 5a and 6a apply.
  • the deformation paths F and G corresponding to the deformation path directions A and B also apply analogously to the exemplary embodiment according to FIGS. 7-9.
  • the 90 ° elbow according to FIG. 7 was also pre-formed with a mechanical pipe bending tool.
  • a longitudinal groove-like sink 48 is shown in FIG. 7.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Forging (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Metal Extraction Processes (AREA)
  • Powder Metallurgy (AREA)

Claims (16)

  1. Procédé de formage hydrostatique de corps creux (21) en métal déformable à froid, sur la largeur initiale libre du corps creux (21) à l'intérieur d'une cavité de formage d'une matrice (16), un liquide sous pression étant injecté depuis l'extérieur dans le corps creux (21), une zone de déformation du corps creux (21) étant déplacée seulement au moyen du liquide sous pression par rapport à la cavité de formage et la paroi (47) du corps creux étant pressée sur la gravure (20) de la cavité de formage (17) et le corps creux (21) étant reçu à l'extérieur de la zone de déformation (31) avec au moins une zone de raccordement (26), conductrice de l'effet d'appui ou du liquide sous pression, à l'aide d'au moins un manchon (24) rigide, sensiblement sans effort axial et de façon mobile axialement avec un siège coulissant, caractérisé en ce que la paroi (47) du corps creux est reçue sur chaque zone d'appui ou de raccordement (26), sensiblement sans effort axial et de façon déplaçable axialement avec un siège coulissant, dans le manchon (24), en ce que, aux endroits (45) auxquels un amincissement hydrostatique de la paroi (47) du corps creux doit être généré, un espacement (G) est laissé à dessein entre la surface extérieure de la paroi (47) du corps creux et la surface intérieure (20B) de la gravure (20), et en ce que l'espacement (G) est sensiblement proportionnel au degré de déformation à atteindre.
  2. Procédé selon la revendication 1, caractérisé en ce que le corps creux (21) est formé hydrostatiquement en utilisant plusieurs plages de pressions, respectivement niveaux de pression, allant en montant successivement, du liquide sous pression.
  3. Procédé selon la revendication 2, caractérisé en ce que la transition entre une plage de pressions, respectivement un niveau de pression, vis-à-vis de la plage ou du niveau voisin, immédiatement supérieur, est effectuée de façon glissante, sensiblement sans transition selon un ordre de succession temporel direct et en ce que ce formage hydrostatique est effectué dans la même matrice (16).
  4. Procédé selon la revendication 2 ou la revendication 3, caractérisé en ce que, avant le début du formage hydrostatique, le liquide sous pression est d'abord introduit avec une pression de remplissage dans le corps creux (21), puis une augmentation de la pression de liquide, pour atteindre le niveau d'une pression de formage, est effectuée, pression dont la valeur maximale est un multiple de la valeur maximale de la pression de remplissage.
  5. Procédé selon la revendication 4, caractérisé en ce que la valeur de pression de formage est à peu près de 30 à 50 fois la valeur de la pression de remplissage.
  6. Procédé selon la revendication 4 ou 5, caractérisé en ce que la pression de formage nécessaire pour obtenir le formage hydrostatique d'un corps creux (21) est augmentée de la valeur d'une pression additionnelle.
  7. Procédé selon l'une des revendications 2 à 6, caractérisé en ce que, pendant le formage hydrostatique, l'air se trouvant au préalable dans le corps creux (21) est en même temps comprimé au moyen du liquide, en ce que, après achèvement du formage hydrostatique, l'alimentation en pression du liquide sous pression est coupée, à la suite de quoi l'air comprimé est détendu et le liquide sous pression est de ce fait refoulé hors du corps creux (21).
  8. Procédé selon l'une des revendications 2 à 7, caractérisé en ce que le formage hydrostatique du corps creux (21) est effectué dans plusieurs matrices (16) différentes, dans lesquelles le formage hydrostatique respectif s'effectue par le biais d'au moins une plage de pressions ou bien par le biais d'au moins un niveau de pression du liquide sous pression.
  9. Dispositif de mise en oeuvre du procédé de formage hydrostatique de corps creux (21) en un métal déformable à froid sur la valeur initiale libre du corps creux (21), avec une matrice (16) présentant une cavité de formage (17), avec au moins un manchon rigide (24) séparé, pouvant être bloqué par rapport à la matrice, dispositif au moyen duquel le corps creux (21) est susceptible d'être reçu à l'extérieur de sa plage de déformation (31) avec au moins une plage de raccordement (26) conductrice de l'appui ou du liquide sous pression, réception se faisant avec étanchéité à la pression ainsi que sensiblement sans effort axial et de façon mobile axialement avec un siège coulissant, un déplacement du corps creux (21) tubulaire par rapport au manchon (24) étant effectué lors de l'injection du liquide sous pression avec une pression de formage hydrostatique, le liquide sous pression étant susceptible d'être introduit dans le corps creux (21) par au moins un manchon (24), caractérisé en ce que chaque manchon (24) est mobile dans un sens et dans l'autre en translation par rapport à la matrice (16) (flèche double x), et en ce que chaque manchon (24) constitue un siège coulissant d'entourage pour recevoir respectivement une zone d'appui ou de raccordement (26) du corps creux (21).
  10. Dispositif selon la revendication 9, caractérisé en ce que le manchon (24), après fermeture de la matrice (16), est susceptible d'être appliqué jusqu'à appui sur toute la surface (en 25) sur la matrice (16), sur la zone d'appui ou de raccordement (26) du corps creux (21).
  11. Dispositif selon la revendication 9 ou la revendication 10, caractérisé en ce que le manchon (24) contient au moins une manchette d'étanchéité entourant la zone d'appui ou de raccordement (26) du corps creux (21), se plaçant sous contrainte autour du corps creux (21) sous l'effet du liquide sous pression, telle qu'une manchette annulaire à gorge (27) ou analogue, alimentée directement par le liquide sous pression dans la conduite d'amenée (28, 29, 30) allant au corps creux (21).
  12. Dispositif selon l'une des revendications 9 à 11, caractérisé en ce que, lorsque l'on a deux zones d'appui ou de raccordement (26) situées du côté du corps creux, à chaque zone d'appui ou de raccordement (26) est associé un manchon (24) à introduction de liquide sous pression.
  13. Dispositif selon l'une des revendications 9 à 11, caractérisé en ce que, lorsque l'on a deux zones d'appui ou de raccordement (26) situées du côté du corps creux, un manchon (24) avec une injection de liquide sous pression est associé à une zone d'appui ou de raccordement (26) et un manchon borgne (24) est associé à l'autre zone d'appui ou de raccordement (26).
  14. Dispositif selon l'une des revendications 9 à 13, caractérisé en ce que chaque manchon (24) présente une surface d'enveloppe intérieure (37) s'ouvrant vers l'extérieur en forme de cône, réalisée sous forme d'ouverture d'introduction (36) à peu près en forme d'entonnoir pour la zone de maintien (26) située du côté du corps creux.
  15. Dispositif selon la revendication 14, caractérisé en ce que l'ouverture d'introduction (36) fait partie d'un écrou raccord (35) saisissant par le dessus un corps de manchon (32).
  16. Dispositif selon l'une des revendications 9 à 15, caractérisé en ce que la manchette d'étanchéité (24) est maintenue intérieurement entre l'écrou raccord (35) et le corps de manchon (32).
EP92903582A 1991-02-01 1992-01-31 Procede et dispositif de formage hydrostatique de corps creux en metal deformable a froid Expired - Lifetime EP0523215B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4103082 1991-02-01
DE4103082A DE4103082A1 (de) 1991-02-01 1991-02-01 Verfahren zum hydrostatischen umformen von hohlkoerpern aus kaltumformbarem metall und vorrichtung zur durchfuehrung des verfahrens
PCT/DE1992/000060 WO1992013653A1 (fr) 1991-02-01 1992-01-31 Procede et dispositif de formage hydrostatique de corps creux en metal deformable a froid

Publications (2)

Publication Number Publication Date
EP0523215A1 EP0523215A1 (fr) 1993-01-20
EP0523215B1 true EP0523215B1 (fr) 1997-09-03

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EP92903582A Expired - Lifetime EP0523215B1 (fr) 1991-02-01 1992-01-31 Procede et dispositif de formage hydrostatique de corps creux en metal deformable a froid

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US (1) US5303570A (fr)
EP (1) EP0523215B1 (fr)
JP (1) JP2542320B2 (fr)
AT (1) ATE157571T1 (fr)
BR (1) BR9204114A (fr)
DE (2) DE4103082A1 (fr)
DK (1) DK0523215T3 (fr)
ES (1) ES2109339T3 (fr)
WO (1) WO1992013653A1 (fr)

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Also Published As

Publication number Publication date
BR9204114A (pt) 1993-06-08
DE59208844D1 (de) 1997-10-09
DE4103082A1 (de) 1992-08-27
EP0523215A1 (fr) 1993-01-20
DE4103082C2 (fr) 1993-09-16
ATE157571T1 (de) 1997-09-15
JPH05504725A (ja) 1993-07-22
US5303570A (en) 1994-04-19
ES2109339T3 (es) 1998-01-16
DK0523215T3 (da) 1997-12-01
WO1992013653A1 (fr) 1992-08-20
JP2542320B2 (ja) 1996-10-09

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