EP2877298B1 - Procédé d'extrusion direct ou indirect de tubes métalliques, presse d'extrusion de tubes métalliques ainsi que tube métallique extrudé - Google Patents

Procédé d'extrusion direct ou indirect de tubes métalliques, presse d'extrusion de tubes métalliques ainsi que tube métallique extrudé Download PDF

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Publication number
EP2877298B1
EP2877298B1 EP13762732.9A EP13762732A EP2877298B1 EP 2877298 B1 EP2877298 B1 EP 2877298B1 EP 13762732 A EP13762732 A EP 13762732A EP 2877298 B1 EP2877298 B1 EP 2877298B1
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EP
European Patent Office
Prior art keywords
metal pipe
mandrel
pressing
wall thicknesses
difference
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EP13762732.9A
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German (de)
English (en)
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EP2877298A1 (fr
Inventor
Uwe Muschalik
Koos VAN PUTTEN
Anna ROTT
Jens MAGENHEIMER
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SMS Group GmbH
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SMS Group GmbH
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Classifications

    • 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
    • B21C25/00—Profiling tools for metal extruding
    • B21C25/04—Mandrels
    • 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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, bars, tubes
    • B21C23/085—Making tubes
    • 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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/20—Making uncoated products by backward extrusion
    • B21C23/205—Making products of generally elongated shape
    • 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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/21—Presses specially adapted for extruding metal
    • B21C23/217—Tube extrusion presses
    • 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
    • B21C25/00—Profiling tools for metal extruding
    • B21C25/08—Dies or mandrels with section variable during extruding, e.g. for making tapered work; Controlling variation
    • 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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, bars, tubes
    • 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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/20—Making uncoated products by backward extrusion
    • 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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/21—Presses specially adapted for extruding metal

Definitions

  • the invention relates to a direct or indirect metal pipe extrusion process in which a metal block is pressed through a die and over a mandrel to form a metal pipe, the mandrel having two axially offset pressing surfaces of different radial characteristics and optionally being positioned in two press positions axially with respect to the die that in a first of the two pressing positions a first of the two pressing surfaces and in a second of the two pressing positions a second of the two pressing surfaces has a deforming effect on the workpiece pressed from the metal block to the metal tube.
  • the invention also relates to a metal pipe extrusion press with a billet receiver, with a die and with a mandrel for pressing metal pipes with two axially offset pressing surfaces of different radial characteristics and with a transition area between the two pressing surfaces.
  • the invention relates to an extruded metal tube, preferably made of aluminum, with two different wall thicknesses and a transition area located between the wall thicknesses, a constriction being present in the transition area.
  • Such direct or indirect metal pipe extrusion processes are per se sufficient from the prior art, for example from the DE 100 21 881 A1 , of the JP H01-192414 A or from the JP H06-304644 A , known, whereby by a mandrel with two axially offset arranged pressing surfaces of different radial characteristics, which is optionally shifted axially, the inner diameter of the metal pipes pressed in this way can be changed accordingly complementary to the respective pressing surfaces, which act as active surfaces in interaction with the die Form associated gap, which is accordingly also variable and through which the workpiece is pressed in a deforming manner.
  • this gap can accordingly be changed in a targeted manner. While the change in wall thickness naturally occurs in such a design of a metal pipe extrusion press or in such a process management, such extruded metal pipes have a constriction radially on the outside in their transition area between the two wall thicknesses.
  • Such metal pipes with different wall thicknesses are known, for example, as drill rods, but can be used for other purposes, for example as a housing.
  • aluminum pipes or pipes made of aluminum or similar metals, which can be extruded accordingly, are of importance in this regard.
  • a direct or indirect metal pipe extrusion process with the features of claim 1, a metal pipe extrusion press with the features of claim 3 and an extruded metal pipe with the features of claims 8 and 9 are proposed as a solution.
  • a direct or indirect metal pipe extrusion process can be used here, in which a metal block is pressed through a die and over a mandrel to form a metal pipe and in which the mandrel has two axially offset pressing surfaces of different radial characteristics and is optionally positioned in two pressing positions axially with respect to the die that in a first of the two pressing positions a first of the two pressing surfaces and in a second of the two pressing positions a second of the pressing surfaces acts on the workpiece pressed from the metal block to the metal tube, characterized in that the workpiece is supported on the mandrel side at the axial height of the die while the mandrel is positioned with respect to the die from the first pressing position to the second position.
  • the depth but also the length of such a constriction can be changed.
  • the depth of the constriction can be reduced so that the effects of the constriction are correspondingly reduced.
  • the length of the constriction can be increased by supporting, so that any guiding inaccuracies on the outside of the metal pipe or the occurrence of load peaks inside the metal pipe can be reduced accordingly.
  • an extruded metal tube with two different wall thicknesses and a transition area located between the wall thicknesses, with a constriction being present in the transition area can be characterized in that the constriction has a depth that is smaller than the difference between the two wall thicknesses.
  • the deviation from this difference is preferably at least 10%. However, it can also be 15% or more if the process is carried out appropriately.
  • the support made in the course of the process makes it possible for the first time to reduce the depth of the constriction in a targeted manner.
  • the support also makes it possible for the first time to provide an extruded metal tube with two different wall thicknesses and a transition area located between the wall thicknesses, in which there is a constriction in the transition area and which is characterized in that the constriction has a length greater than is the difference between the two wall thicknesses, and here too the deviation from the difference between the two wall thicknesses can be at least 10%. However, depending on the specific procedure, the deviation from the difference can be up to 100%. Likewise, if the process is carried out appropriately, the length of the constriction can be selected to be even longer than the smaller, and possibly even longer than the larger wall thickness. However, it must be taken into account here that too long a transition area between the two wall thicknesses ultimately leads to a correspondingly increased material consumption in the production of metal pipes, which can accordingly also lead to undesirable results, so that an upper limit is naturally to be found here.
  • an extruded metal tube with two different wall thicknesses and a transition area located between the wall thicknesses in which there is a constriction in the transition area can be characterized in that the wall thickness in the area of the constriction is greater than the smaller of the two wall thicknesses.
  • the latter can be designed in such a way that in the area of the constriction the wall thickness is greater than the smaller of the two wall thicknesses by at least 10% of the difference between the two wall thicknesses, preferably by 20% of the difference between the two wall thicknesses.
  • the workpiece is only supported at the axial height of the die after the workpiece has formed a free surface in relation to the mandrel.
  • a free surface follows when the mandrel is axially offset and therefore positioned from the first pressing position to the second pressing position, although the workpiece or the metal block is still pressurized. This is due to the fact that the workpiece is plasticized for forming and pressed between the die and the mandrel.
  • the workpiece is thus deformable and can adapt to a changed volume that is offered between the mandrel and die, such an adaptation does not take place immediately due to the high viscosity of the plasticized material and therefore also not at the speed at which the mandrel is displaced .
  • the support preferably only takes place when the free surface is displaced in the direction of the mandrel. With such a procedure, a corresponding plastic displacement can result far into the metal block, so that the free space created by the repositioning of the mandrel is filled with material again as quickly as possible. Accordingly, the transition area between the two wall thicknesses of the metal pipe is then kept to a minimum.
  • a mandrel for pressing Matill pipes with two axially offset pressing surfaces of different radial characteristics and with a transition area between the two pressing surfaces is characterized in that the mandrel has a support surface in the transition area.
  • press curses refers to the curses which, as intended, define the gap between the die and the mandrel during pressing in interaction with the die and have a deforming effect on the workpiece.
  • Other surfaces of the cathedral do not come along at all in contact with the material or have no significant influence on the forming process, since the material only flows past the corresponding surfaces.
  • the support surface in the transition area enables the workpiece to be supported on the mandrel at the axial height of the die in a structurally relatively simple manner, while the mandrel is positioned with respect to the die from the first pressing position to the second pressing position.
  • the support surface preferably has a constant cross section over an axial support length, so that the material is offered a defined support when it flows into the free space between the die and the mandrel.
  • metal pipes pressed in this way generally have a round cross section, so that a mandrel is accordingly also essentially cylindrical. This accordingly also applies to the pressing surfaces and preferably to the supporting surface.
  • the support length is less than or equal to 80% of the axial distance between the two pressing surfaces. In particular, it can be selected to be less than or equal to 60% or 50% of the axial distance between the two pressing surfaces. It is possibly even conceivable, in particular if several support surfaces with different cross-sections are used, to select the support length of the individual support surfaces to be even shorter. In addition, it has been found that the support length should preferably be greater than or equal to 2% of the axial distance between the two pressing surfaces. The support length is preferably greater than or equal to 5% or 10% of the axial distance between the two pressing surfaces. In this way, adequate support can be ensured.
  • the mandrel will taper monotonically from the mandrel base to the mandrel tip in each cross-section running through the mandrel axis, that is, apart from any holding devices in the area of the mandrel base, will not have any widening of the radius. This seems to make sense for energetic reasons.
  • the first of the two pressing surfaces is arranged at a greater distance from the mandrel axis and further away from the mandrel tip than the second of the two pressing surfaces.
  • the different radial characteristics of the two pressing surfaces result in at least a certain angle around the mandrel axis, corresponding to a section through the mandrel axis, which is placed exactly at this angle, in a difference between the corresponding radii of these two pressing surfaces and the mandrel axis, since otherwise there is naturally no different radial expression would exist.
  • the radius of the support surface oriented at the same angle around the mandrel axis is smaller by more than 5% of the radius difference than the larger of the two radii or than a radius of a further support surface oriented at the same angle around the mandrel axis.
  • the radius of the support surface oriented at the same angle around the mandrel axis is less than 70% of the radius difference smaller than the larger of the two radii or than the radius of a further support surface oriented at the same angle around the mandrel axis. In this way it can be ensured that the support surface is not too far removed from the free material surface and that too strong a material flow occurs in this free space, which is not trimmed off sufficiently quickly.
  • the support surface can be smaller by more than 7% or more than 10% of the radius difference.
  • the radius of the support surface can be made smaller by less than 55% or 50% of the radius difference.
  • support surfaces can be provided, which - depending on the specific procedure - also leads to an extruded metal tube with two different wall thicknesses and a transition area located between the wall thicknesses, in which in the transition area there is a constriction and which is characterized by at least two constrictions.
  • Such a design with two constrictions can possibly be implemented with only one support surface if the mandrel is not positioned in a single step from the first pressing position to the second pressing position, but if this repositioning takes place in several steps.
  • the support surface can optionally also be conical or taper at an angle around the mandrel axis. Even if there are several support surfaces, one Gradual repositioning can specifically influence the training and the number of constrictions.
  • the constrictions are each smaller, that is to say their effects are minimized, which cumulatively leads to a reduction in the disadvantageous effects.
  • the present invention is particularly suitable for aluminum or aluminum pipes and for other extrudable metals or metal pipes.
  • the present invention is suitable, for example, for drill rods made of such materials, but also for corresponding tubular structures for other purposes made of such materials.
  • the two metal pipe extrusions 10 and 20 each have a block receiver 1, a die 2, a press ram 3 that can be displaced relative to the block receiver 1 and a mandrel 6 which, together with the die 2, forms a gap through which a workpiece moves from a metal block 5 to a Metal pipe 9 is pressed.
  • the direct metal pipe extrusion press 10 shown has a press plunger 3 arranged in front of the block receiver 1 in the pressing direction P, which in a known manner drives a press disk 4 in the pressing direction P into the block receiver 1, whereby the space available in the block receiver 1 is correspondingly reduced.
  • a die holder 7 is provided on the block pick-up 1, on which the die 2 is held in a stationary manner with respect to the block pick-up 1. If the ram 3 is now moved in the pressing direction P, the workpiece is pressed through the gap to form a metal tube 9, which leaves the gap in the pressing direction P.
  • the indirect metal pipe extrusion press 20 shown comprises a press plunger 3, which is arranged in the pressing direction P behind the block pick-up 1, which is moved against the pressing direction P for pressing and carries the die 2, the block pick-up 1 having a closure piece 8 at its end facing away from the press plunger 3, which this closes against the pressing direction P.
  • the ram 3 If the ram 3 is now displaced against the pressing direction P, it presses the die 2 over the mandrel 6 in the direction of the locking piece 8, so that the die 2 is displaced in relation to the block receiver 1, i.e. differently than in the case of a direct metal pipe extrusion press 10 does not remain stationary on the block pickup 1.
  • the mandrel 6 is displaced together with the ram 3 or the die 2 in relation to the block receiver 1.
  • the relative movement between ram 3 and block picker 1 can be implemented in different ways, for example by holding the block picker 1 still and moving the press ram 3 or, on the other hand, keeping the press ram 3 still and moving the block picker 1. It is also conceivable to move both assemblies as long as the relative movement required for pressing between the ram 3 and the block receiver 1 remains.
  • the mandrel is designed to be rotationally symmetrical with respect to its mandrel axis 68, which, however, is not absolutely necessary in all embodiments.
  • the mandrel 6 tapers towards its mandrel tip 61 and has a first pressing surface 63 and a second pressing surface 64, which, by axially displacing the mandrel 6, can each be brought into a position in which they are directly together with the die 2 have a reshaping effect on the material of the workpiece and can shape the metal tube 9.
  • a transition area 66 is arranged between the first pressing surface 63 and the second pressing surface 64, in which a support surface 62, which in this exemplary embodiment is aligned in a cylindrical manner around the mandrel axis 68, is provided.
  • the first pressing surface 63 has a length 71 and the second pressing surface 64 has a length 72. There is a distance 73 between the two pressing surfaces 63, 64, which defines the transition area 66.
  • the mandrel bar 6 is held in a manner known per se on its mandrel foot 67 and can be displaced over this. In particular, it can be positioned from a first pressing position in which the first pressing surface 63 interacts with the die 2 into a second pressing position in which the second pressing surface 64 interacts with the die 2, as shown in FIG Figures 1 to 3 is shown as an example.
  • the wall thickness can be changed according to the different cross-sections of the two pressing surfaces 63, 64, with the result that a metal tube 9 with different wall thicknesses and a transition area provided between these can be provided.
  • a constriction E in the transition area which can be minimized by suitable support during the repositioning of the dome and, if necessary, also avoided entirely.
  • the present exemplary embodiments relate to aluminum tubes as metal tubes 9, with other metals that can be pressed into tubes via an extrusion process, correspondingly alternatively, being used accordingly.
  • Block pick-up 62
  • Support surface 2 die 63
  • first pressing surface 3 Press ram
  • second pressing surface 4th Press disc
  • Support length 5
  • Metal block 66
  • Transition area 6th mandrel
  • Thorn foot 7th Die holder
  • Mandrel axis 8th Locking piece
  • Length of the first pressing surface 9
  • Metal pipe 72
  • Length of the second pressing surface 10 direct metal pipe extruder 73

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)

Claims (13)

  1. Procédé d'extrusion direct ou indirect de tubes métalliques pour lequel un bloc de métal (5) est comprimé par une matrice (2) et par le biais d'un mandrin (6) en un tube métallique (9), sachant que le mandrin (6) comporte deux surfaces de pression (63, 64) disposées axialement décalées d'empreinte radiale différente et est positionné sélectivement en deux positions d'extrusion axialement par rapport à la matrice de telle manière que dans une première des deux positions d'extrusion, une première des deux surfaces d'extrusion (63, 64) et dans une deuxième des deux positions d'extrusion, une deuxième des deux surfaces d'extrusion (63, 64) agit par déformation sur la pièce extrudée du bloc de métal (5) pour former un tube métallique (9), caractérisé en ce que le mandrin (6) comporte entre les deux surfaces d'extrusion (63, 64) une zone de transition (66) et comporte dans la zone de transition (66) une surface d'appui (62), sachant que la pièce est supportée côté mandrin à la hauteur axiale de la matrice (2) par la surface d'appui (62), alors que le mandrin (6) est positionné par rapport à la matrice (2) de la première position d'extrusion à la deuxième position d'extrusion et sachant que l'appui par la surface d'appui (62) n'a lieu qu'après que la pièce a formé une surface libre par rapport au mandrin (6) .
  2. Procédé d'extrusion de tubes métalliques selon la revendication 2, caractérisé en ce que l'appui n'a lieu que lorsque la surface libre se déplace en direction du mandrin (6).
  3. Presse d'extrusion de tubes métalliques (10, 20) avec un support de bloc (1), avec une matrice (2) et avec un mandrin (6) pour extruder des tubes métalliques (9) avec deux surfaces d'extrusion (63, 64) disposées axialement décalées d'empreinte radiale différente ainsi qu'avec une zone de transition (66) entre les deux surfaces d'extrusion (63, 64), caractérisée en ce que le mandrin (6) dans la zone de transition (66) comporte une surface d'appui (62) avec une section constante sur une longueur d'appui (65) axiale, qui est plus petite ou égale à 80 % de la distance axiale (73) entre les deux surfaces d'extrusion (63, 64).
  4. Presse d'extrusion (10, 20) selon la revendication 3, caractérisée par une longueur d'appui (65), qui est plus petite ou égale à 60 %, de préférence 50 %, de la distance axiale (73) entre les deux surfaces d'extrusion (63, 64).
  5. Presse d'extrusion (10, 20) selon la revendication 3 ou 4, caractérisée par une longueur d'appui (65), qui est plus grande ou égale à 2 %, de préférence 5 % ou 10 %, de la distance axiale (73) entre les deux surfaces d'extrusion (63, 64).
  6. Presse d'extrusion de tubes métalliques (10, 20) selon l'une quelconque des revendications 3 à 5, caractérisée en ce que l'empreinte radiale différente des deux surfaces d'extrusion (63, 64) résulte en une différence de rayons des deux surfaces d'extrusion (63, 64), orientés dans un même angle autour d'un axe de mandrin (68) et le rayon de la surface d'appui (62) orienté dans le même angle autour de l'axe de mandrin (68) est plus petit de plus de 5 % de la différence de rayon que le plus grand des deux rayons ou qu'un rayon d'une autre surface d'appui (62), orienté dans le même angle autour de l'axe de mandrin (68).
  7. Presse d'extrusion de tubes métalliques (10, 20) selon l'une quelconque des revendications 3 à 6, caractérisée en ce que l'empreinte radiale différente des deux surfaces d'extrusion (63, 64) résulte en une différence de rayons des deux surfaces d'extrusion (63, 64) orientés dans un même angle autour d'un axe de mandrin et le rayon de la surface d'appui (62) orienté dans le même angle autour de l'axe de mandrin (68) est plus petit de moins de 70 % de la différence de rayon que le plus grand des deux rayons ou qu'un rayon d'une autre surface d'appui (62) orienté dans le même angle autour de l'axe de mandrin (68).
  8. Tube métallique extrudé (9) avec deux épaisseurs de paroi différentes et une zone de transition se trouvant entre les épaisseurs de paroi, sachant que dans la zone de transition, une constriction (E) est présente, caractérisé en ce que la constriction (E) comporte une profondeur , qui est plus petite que la différence des deux épaisseurs de paroi.
  9. Tube métallique extrudé (9) avec deux épaisseurs de paroi différentes et une zone de transition se trouvant entre les épaisseurs de paroi, sachant que dans la zone de transition, une constriction (E) est présente, caractérisé en ce que la constriction (E) comporte une longueur qui est plus grande que la différence des deux épaisseurs de paroi.
  10. Tube métallique selon la revendication 8 ou 9, caractérisé en ce que l'écart de la différence entre les deux épaisseurs de paroi est au moins de 10 %.
  11. Tube métallique (9) selon l'une quelconque des revendications 8 à 10, caractérisé par au moins deux constrictions (E).
  12. Tube métallique (9) selon l'une quelconque des revendications 8 à 11, caractérisé en ce que dans la zone de la constriction (E), l'épaisseur de paroi est plus grande que la plus petite des deux épaisseurs de paroi.
  13. Tube métallique selon la revendication 12, caractérisé en ce que dans la zone de la constriction (E), l'épaisseur de paroi est au moins de 10 % de la différence des deux épaisseurs de paroi, de préférence de 20 % de la différence des deux épaisseurs de paroi, plus grande que la plus petite des deux épaisseurs de paroi.
EP13762732.9A 2012-07-27 2013-07-24 Procédé d'extrusion direct ou indirect de tubes métalliques, presse d'extrusion de tubes métalliques ainsi que tube métallique extrudé Active EP2877298B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102012014836 2012-07-27
DE102012021787.0A DE102012021787B4 (de) 2012-07-27 2012-11-08 Direktes oder indirektes Rohrstrangpressverfahren, Dorn zum Pressen von Rohren, Rohrstrangpresse sowie stranggepresstes Rohr
PCT/DE2013/000401 WO2014015849A1 (fr) 2012-07-27 2013-07-24 Procédé d'extrusion direct ou indirect de tubes métalliques, mandrin pour presser les tubes métalliques, presse d'extrusion de tubes métalliques ainsi que tube métallique extrudé

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EP2877298A1 EP2877298A1 (fr) 2015-06-03
EP2877298B1 true EP2877298B1 (fr) 2021-04-07

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US (2) US20150174630A1 (fr)
EP (1) EP2877298B1 (fr)
JP (1) JP6195090B2 (fr)
KR (2) KR101906088B1 (fr)
CN (1) CN104487182A (fr)
DE (1) DE102012021787B4 (fr)
ES (1) ES2873363T3 (fr)
RU (1) RU2634821C2 (fr)
WO (1) WO2014015849A1 (fr)

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WO2018039658A1 (fr) 2016-08-26 2018-03-01 Harsco Technologies LLC Système et procédés de mesure de voie inertiels
CN109467146B (zh) * 2018-12-24 2022-01-14 宁波驰翔机电科技有限公司 伸缩式污水处理管
CN113399486B (zh) * 2021-06-17 2022-04-22 西北工业大学 一种多段式冷挤压强化装置及使用方法
CN115319412B (zh) * 2022-08-08 2023-06-06 四川航天中天动力装备有限责任公司 一种变壁厚壳体加工工艺方法

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US20170297069A1 (en) 2017-10-19
US10906077B2 (en) 2021-02-02
ES2873363T3 (es) 2021-11-03
KR101906088B1 (ko) 2018-10-08
RU2634821C2 (ru) 2017-11-03
DE102012021787A1 (de) 2014-01-30
DE102012021787B4 (de) 2017-09-21
WO2014015849A1 (fr) 2014-01-30
US20150174630A1 (en) 2015-06-25
JP2015527200A (ja) 2015-09-17
KR20150037765A (ko) 2015-04-08
CN104487182A (zh) 2015-04-01
JP6195090B2 (ja) 2017-09-13
EP2877298A1 (fr) 2015-06-03
KR20170102036A (ko) 2017-09-06
RU2015101559A (ru) 2016-09-20

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