EP1017527B1 - Procede et dispositif d'extrusion en continu d'une barre en une matiere premiere plastique pourvue d'un canal interieur en spirale - Google Patents

Procede et dispositif d'extrusion en continu d'une barre en une matiere premiere plastique pourvue d'un canal interieur en spirale Download PDF

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Publication number
EP1017527B1
EP1017527B1 EP97950028A EP97950028A EP1017527B1 EP 1017527 B1 EP1017527 B1 EP 1017527B1 EP 97950028 A EP97950028 A EP 97950028A EP 97950028 A EP97950028 A EP 97950028A EP 1017527 B1 EP1017527 B1 EP 1017527B1
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EP
European Patent Office
Prior art keywords
nozzle mouthpiece
flow
array
guiding surfaces
raw material
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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EP97950028A
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German (de)
English (en)
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EP1017527A1 (fr
Inventor
Konrad Friedrichs
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Konrad Friedrichs GmbH and Co KG
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Konrad Friedrichs GmbH and Co KG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • 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
    • B21C23/14—Making other products
    • B21C23/147—Making drill blanks
    • 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
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/26—Extrusion dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F2005/004—Article comprising helical form elements

Definitions

  • the invention relates to a method and Device for the continuous extrusion of with at least one at least in sections helical inner channel made of rods plastic raw material, according to the preamble of Claim 1 or claim 7.
  • Such a method and devices i. H. Extrusion heads for carrying out such Procedures are used, for example, when a rod blank made of a plasticized powder mass, such as B. a powder metallurgical mass, d. H. a hard metal or ceramide mass to a blank, d. H. a sintered metal or a sintered ceramic blank is to be formed from the then in one Sintering or firing process a blank in the form of a cylindrical rod for a high-performance tool arises.
  • These blanks are characterized by the used Tools or powder mixtures by one very high basic strength, both in terms of mechanical stress and abrasion, so that one has passed to such blanks in particular in the manufacture of drilling or milling tools consulted.
  • a method is described in document EP 465 946 A1 and a device according to the preamble of Claim 1 or claim 5 described, with which it succeeds Process step of external cylindrical grinding of the finished Sintered blank blanks can be saved.
  • there the inside surface of the nozzle mouthpiece is removed from the Shell surface of a circular cylinder formed.
  • the nozzle mouthpiece is within the mass flow Swirl device upstream.
  • the extrusion molding compound is used as an alternative Swirl device an even across the cross section the twisting motion of the strand is forced while according to the second alternative the Swirl device through the extrusion a swirl or. Rotational movement is forced.
  • For education of the at least one internal channel protrudes into the Mass flow following the swirl or rotational movement, threadlike material.
  • the Pitch diameter on which the cross section of the at least one internal cooling channel in the extruded blank comes to rest through which Flow velocity and through the friction losses influenced in the nozzle mouthpiece.
  • the nozzle mouthpiece be rotatable, whereby the rotational movement corrects the rotational movement of the mass flow is made possible.
  • This known method can be used plasticized masses in the extrusion process Process blanks that differ in terms of their external dimensions and the geometry and location of the at least one internal cooling channel through a distinguish very high accuracy.
  • these known methods and devices for Performing this procedure the need that Working accuracy largely independent of the Operating parameters of the method, such as. B. of the Flow conditions in the inlet area of the Nozzle mouthpiece, from the composition of the plasticized mass and of the Flow velocities through the nozzle mouthpiece and to keep the like.
  • the invention is therefore based on the object a method according to the preamble of the claim 1 and a device according to the preamble of Claim 7 develop such that the disturbance variables mentioned above with little effort can be suppressed so that the Manufacturing accuracy is maintained even if system-related parameter fluctuations occur.
  • a Flow control surface arrangement integrated, the Adjustment to the longitudinal axis of the nozzle mouthpiece an actuating device, which is preferably by a external actuating force can be actuated is adjustable.
  • this simplifies the Extrusion head a variety of geometries extruded blanks without complex changeover measures are producible, this results in the special Advantage that the rotational movement of the plastic Raw material continuously during the extrusion process is so correctable that the location and course of the at least one internal cooling channel inside narrow tolerance limits can be kept. Fluctuations in the process parameters of the Extrusion processes can be reliable in this way be adjusted or compensated.
  • the blank is made with a smooth extruded circular cylindrical outer surface, which - under Consideration of the relevant shrinkage - see above is kept as low as possible Material removal during the finishing of the blank accrues. Because the angle of attack of the Flow control surface arrangement during the Extrusion process can be readjusted at any time Helix pitch of at least one inside Channel within previously unattainable narrow limits be held, even if the Mass flow rate of the plasticized mass and / or other physical conditions of the extrusion process should change.
  • the flow control surface arrangement is designed that they are only axially limited Inlet section of the nozzle mouthpiece extends. Thereby it is ensured that the through the Flow control surface arrangement induced Rotation movement of the nozzle mouthpiece reliably in is capable of over the remaining flow length of the Mass flow in the nozzle mouthpiece of the mass over the Stiction of friction on the inner wall of the Nozzle's own rotational movement upright maintain or stabilize.
  • the flow guide surface arrangement or adapted to the geometry of the nozzle mouthpiece that the extruded mass flow at exit with the same Angular speed of the nozzle mouthpiece rotates.
  • the Adjustment and adjustment of the rotational movement of the Mass flow becomes even more precise in this way is particularly advantageous if the Actuator for the flow control surface arrangement in a control loop of the extrusion device is integrated.
  • the at least one vane is at least preferably over a significant distance supports the inner surface of the nozzle mouthpiece, larger forces can be absorbed. This leads to advantageous way that the radial extension the guide vane can be enlarged, with the result that the coupling between flow velocity and Speed of rotation of the nozzle mouthpiece and thus the three-flow becomes more precise.
  • the Actuator for the flow control surface arrangement has a vibration damping device.
  • This Vibration damping device is advantageously incorporated into an actuator gear, namely preferably in the form of a damped elasticity.
  • A is such a vibration damping device especially advantageous when the actuating device into a control system for the geometry of the incorporated at least one internal cooling channel is.
  • the inventive method works under Use of flexible or highly elastic Threads that are then stationary with their upstream End preferably in the inlet area of the nozzle mouthpiece be determined.
  • processes using threads or Perform internal rods that increase the Dimensional stability have a higher modulus of elasticity, whereby these thin rods or pins then on a carrier are held, which is rotatably mounted about an axis of rotation which coincides with the axis of the nozzle mouthpiece.
  • FIG. 1 shows a schematic cross section through the downstream area of a Extrusion head for performing the invention Process.
  • Fig. 1 is the reference numeral 10 Extrusion head with which a method for continuous extrusion of at least one at least in sections helical inner channel equip rods made of plastic raw material can be carried out.
  • the plastic raw material can e.g. B. from a powder metallurgical or ceramic mass consist, the powder preferably from the group of ceramic powders, the Tungsten carbide powder, such as. B. a tungsten carbide-cobalt mixture and the metal powder, as well as mixtures these components, such as. B. the ceramide mixtures is selected.
  • the figure shows the downstream End of the extrusion head, which is conical tapered, and the inlet section 12 one Nozzle mouthpiece 14 forms.
  • d. H. in the extrusion head 10 is a designated 16 Holding device arranged on the upstream Ends of threads 18 are fixed with which during extruding the plasticized raw material inside Cooling channels 22 in the extruded circular cylindrical blank rod 24 can be generated.
  • the threads 18 consist of the one in the figure embodiment shown from limp or highly elastic material, such as B. made of plastic or from a chain, the chain links of which are movable hang together.
  • the threads 18 have a downstream located end 18a, which extends over the end face 26 of the Nozzle mouthpiece 14 extends.
  • the threads 18 are on the holding device 16 on a pitch circle diameter TKD1 attached, preferably adjustable to adapt to the particular Nozzle mouthpiece 14, d. H. to the outside diameter D of to be able to make blank bar 24.
  • the arrow R indicates that the relevant guide vanes 28 by means of a not the adjusting device shown are adjustable in such a way that the angle of attack of the guide vane 28 to Longitudinal axis AL of the nozzle mouthpiece 14 is adjustable, and preferably continuously.
  • the figure shows that the Adjustment of the guide vanes 28 by an external one Positioning force can take place, with the result that the Employment of the flow control surface arrangement in the form the guide vanes 28 at any time during the Extrusion process is changeable.
  • the reference numeral 36 is a schematic Bearing indicated, through which the nozzle mouthpiece can be rotated is fixed on the extrusion head 10, in such a way that that the axis of rotation with the longitudinal axis AL of the Nozzle mouthpiece 14 coincides with one Has concentric cylindrical inner bore 38.
  • the Guide vanes 28 are designed in such a way Nozzle mouthpiece 14 arranged that its axial Extension EA only a fraction of the total Length LB of the nozzle mouthpiece 14. Further is the downstream edge 40 of the Guide vanes 28 at a minimum distance BA from Exit end, d. H. from the end face 26 of the Nozzle mouthpiece that is large enough to Ensure that the guide vanes 28 separated flow of the plasticized mass downstream the guide vanes 28 again to a full Circular cross section is closed.
  • the speed of rotation of the nozzle tip 14 is depending on the flow rate of the inflowing plasticized mass and the angle of attack ⁇ .
  • the Dimension LB ultimately determines which one Rotation speed the plasticized mass that Leaves nozzle tip 14, d. H. with which Rotational speed about the axis AL of the Rod blank 24 emerges from the nozzle mouthpiece 14.
  • Adjustment device can be the course of the interior Cooling channels 22 as well as the location of the cooling channels 22, i. H. the pitch circle diameter TKD2 in the finished extruded Blank rod 24 can be set exactly.
  • the actuating axes 32 are preferably the Guide vanes 28 part of a central Actuator, for example in the form of a Planetary gear, so that the angle of attack ⁇ Guide vanes can be changed synchronously and evenly are.
  • suitable vibration damping can be provided his. This vibration damping is, for example, from elastic components with self-damping behavior educated.
  • a measuring and Monitoring device for the geometry of the at least an internal cooling channel 22 or for the determination the location and size of the Pitch circle diameter TKD2 provided.
  • This measuring and Detection device is part of a Control loop in which the corresponding measurement signal the adjusting device for the guide vanes 28 is returned so that the desired location and Geometry of the at least one internal cooling channel 22 regardless of the disturbances occurring, such as. B. the flow rate and the physical Properties of the plasticized mass locked can be.
  • the external adjusting device it is also possible with one and the same Nozzle mouthpiece 14 rods with different To create slopes of the internal cooling channels.
  • the flow guide surface arrangement in Shape of the guide vanes 28 are adjusted so that the guide vanes 28 an angle of attack ⁇ of 0 ° have so that a blank bar 24 with straight internal channels can be produced.
  • the concept according to the invention is the same applicable in the event that the nozzle mouthpiece is non-rotatable is set on the extrusion head 10.
  • the actuator for Flow control surface arrangement in a control system integrate, in which the adjusting device accordingly the measurement signals is controlled.
  • the guide vanes 28 are only shown schematically.
  • the Guide vanes 28 flat on the inner surface 38 of the Nozzle mouthpiece, with an additional frictional connection can be provided. It is also advantageous if the guide vanes 28 are designed so that the Guide surfaces when adjusting the angle of attack ⁇ constantly on the inner wall 38 of the nozzle mouthpiece 14 nestle. This is possible, for example, if the guide vanes are built from links that press resiliently against the inner surface.
  • the inventive method with the help of limited elastic pins operate, instead of the threads 18 on one Holding device are attached, which are rotatable about the Center axis of the nozzle mouthpiece in the extrusion head is stored.
  • the pens, i.e. H. the at least one Pen can be pre-twisted into a helical shape be already largely of that helical shape corresponds to that of the at least one inside Cooling channel after extrusion of the extrusion blank should have.
  • the bracket this core pin made of a material with a high modulus of elasticity to provide a separate drive through which at Integration into a suitable control loop, a Fine tuning of the spiral course is possible.
  • the invention thus provides a method and a Device for the continuous extrusion of with at least one, at least in sections helical inner channel made of rods plastic raw material, such as. B. one powder metallurgical or ceramic mass.
  • the plastic raw material is made from a nozzle mouthpiece pressed out, with the participation of one in it provided flow control surface arrangement in a Rotational movement is offset, at least one upstream of the nozzle mouthpiece eccentric to the rod axis held and through the nozzle mouthpiece extending thread of limp or elastic Takes material and in a spiral shape brings predetermined slope.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)

Claims (24)

  1. Procédé d'extrusion en continu de barres en matière première plastique pourvues d'au moins un canal intérieur au moins hélicoïdal par sections, telle que p. ex. une masse en poudre métallique ou en céramique, dans lequel la matière première plastique est pressée hors d'un nez de buse (14), celle-ci étant mise en mouvement de rotation sous l'action d'un dispositif à surface conductrice de flux y étant prévu, ce dispositif entraínant au moins un fil (18) en matériau souple ou élastique maintenu en amont du nez de buse (14) de manière excentrique par rapport à l'axe de la barre (AL) et s'étendant à travers le nez de buse (14) et l'amenant dans une forme hélicoïdale avec avec un pas prédéterminé, caractérisé en ce que, pour l'ajustement de la position et/ou du pas dudit au moins un canal intérieur (22) hélicoïdal, le mouvement de rotation de la matière première (24) plastique est réglé par une force de commande extérieure modifiant l'angle d'incidence (α) du dispositif à surface conductrice de flux (28) par rapport à l'axe longitudinal (AL) du nez de buse (14).
  2. Procédé selon la revendication 1, caractérisé en ce que le dispositif à surface conductrice de flux (28) tourne, de préférence avec un porteur de surface conductrice (14), dans le même sens que la matière première (24) plastique.
  3. Procédé selon la revendication 1, caractérisé en ce que le dispositif à surface conductrice de flux est maintenu de manière stationnaire.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que la matière première plastique est une masse pulvérisée plastifiée, la poudre étant sélectionnée de préférence parmi le groupe des poudres céramiques, des poudres métalliques dures, comme p. ex. un mélange de carbure de tungstène et de cobalt, et des poudres métalliques, ainsi que parmi des mélanges de ces composants, comme p. ex. des mélanges de cermet.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que le mouvement de rotation de la matière première plastique est réglé par le réglage de préférence continu du dispositif à surface conductrice de flux.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que le mouvement de rotation de la matière première plastique est influencé par un dispositif d'entraínement prévu sur le nez de buse.
  7. Dispositif d'extrusion en continu de barres en matière première plastique pourvues d'au moins un canal intérieur au moins hélicoïdal par sections, telle que p. ex. une masse en poudre métallique ou en céramique, notamment pour la réalisation du procédé selon l'une des revendications 1 à 5, muni d'un nez de buse (14) dans lequel est prévu un dispositif à surface conductrice de flux et à travers lequel s'étend au moins un fil (18) en matériau souple ou élastique maintenu en amont du nez de buse (14) de manière excentrique par rapport à l'axe de la barre (AL), caractérisé en ce que l'angle d'incidence (α) du dispositif à surface conductrice de flux (28) est modifiable par rapport à l'axe longitudinal (AL) du nez de buse (14) au moyen d'un dispositif de réglage (R, 30, 32).
  8. Dispositif selon la revendication 7, caractérisé en ce que le dispositif à surface conductrice de flux (28) présente au moins une pale directrice (28) fixée de manière réglable sur le nez de buse (14).
  9. Dispositif selon la revendication 7 ou 8, caractérisé en ce que le nez de buse est maintenu de manière résistante aux torsions sur une tête d'extrusion.
  10. Dispositif selon la revendication 7 ou 8, caractérisé en ce que le nez de buse agit avec un dispositif d'entraínement.
  11. Dispositif selon la revendication 9 ou 10, caractérisé en ce que le dispositif à surface conductrice de flux s'étend sur une grande partie de la longueur totale du nez de buse.
  12. Dispositif selon la revendication 7, 8 ou 10, caractérisé en ce que le nez de buse (14) est maintenu de manière rotative sur une tête d'extrusion (10), l'axe de rotation (AL) coïncidant avec l'axe central du nez de buse (14).
  13. Dispositif selon la revendication 12, caractérisé en ce que le dispositif à surface conductrice de flux (28) s'étend sur une section d'entrée (LB-BA) du nez de buse (14) limitée axialement.
  14. Dispositif selon la revendication 12 ou 13, caractérisé en ce que le dispositif à surface conductrice de flux (28) est conçu resp. adapté à la géométrie du nez de buse (14) de telle manière que le flux de matière extrudé, à sa sortie, tourne à la même vitesse angulaire que le nez de buse (14).
  15. Dispositif selon l'une des revendications 7 à 14, caractérisé en ce que l'angle d'incidence (α) du dispositif à surface conductrice de flux (28) est modifiable en continu au moins par sections.
  16. Dispositif selon l'une des revendications 7 à 15, caractérisé en ce que le nez de buse (14) a une surface intérieure (38) lisse et cylindrique circulaire, et que le dispositif à surface conductrice de flux (28) se termine à un écart (BA) suffisamment grand devant l'extrémité de sortie (26) du nez de buse (14), de sorte que la barre extrudée a une surface lisse.
  17. Dispositif selon l'une des revendications 8 à 16, caractérisé en ce qu'au moins une pale directrice (28) s'appuie au moins sur une trajectoire (EA) caractéristique, de préférence de manière plane sur la surface intérieure (38) du nez de buse (14).
  18. Dispositif selon l'une des revendications 8 à 17, caractérisé en ce que plusieurs pales conductrices (28) réparties sur la circonférence sont prévues, celles-ci étant réglables de préférence de manière synchrone au moyen du dispositif de réglage (R ,30, 32).
  19. Dispositif selon l'une des revendications 8 à 18, caractérisé en ce que le dispositif de réglage (R, 30, 32) possède un dispositif amortisseur de vibrations pour le dispositif à surface conductrice de flux (28).
  20. Dispositif selon la revendication 19, caractérisé en ce que le dispositif de réglage (R, 30, 32) est intégré dans un système de régulation de la géométrie et/ou de la position d'au moins un canal intérieur (22).
  21. Dispositif selon l'une des revendications 18 à 20, caractérisé en ce que le dispositif de réglage présente un mécanisme de réglage, par exemple sous forme d'un engrenage planétaire.
  22. Dispositif selon l'une des revendications 8 à 21, caractérisé en ce que le dispositif à surface conductrice de flux présente plusieurs dispositifs à pales conductrices décalés axialement.
  23. Dispositif selon l'une des revendications 7 à 22, caractérisé en ce que le dit au moins un fil (18) s'étend au-delà du côté frontal (26) du nez de buse (14).
  24. Dispositif selon l'une des revendications 7 à 23, caractérisé en ce que le dit au moins un fil a un module d'élasticité élevé pour augmenter la stabilité de forme et qu'il est maintenu sur un porteur installé de manière rotative autour d'un axe de rotation coïncidant avec l'axe du nez de buse.
EP97950028A 1996-10-25 1997-10-27 Procede et dispositif d'extrusion en continu d'une barre en une matiere premiere plastique pourvue d'un canal interieur en spirale Expired - Lifetime EP1017527B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19644447A DE19644447C2 (de) 1996-10-25 1996-10-25 Verfahren und Vorrichtung zur kontinuierlichen Extrusion von mit einem wendelförmigen Innenkanal ausgestatteten Stäben aus plastischem Rohmaterial
DE19644447 1996-10-25
PCT/EP1997/005910 WO1998018587A2 (fr) 1996-10-25 1997-10-27 Procede et dispositif d'extrusion en continu d'une barre en une matiere premiere plastique pourvue d'un canal interieur en spirale

Publications (2)

Publication Number Publication Date
EP1017527A1 EP1017527A1 (fr) 2000-07-12
EP1017527B1 true EP1017527B1 (fr) 2002-03-13

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EP97950028A Expired - Lifetime EP1017527B1 (fr) 1996-10-25 1997-10-27 Procede et dispositif d'extrusion en continu d'une barre en une matiere premiere plastique pourvue d'un canal interieur en spirale

Country Status (7)

Country Link
US (1) US6248277B1 (fr)
EP (1) EP1017527B1 (fr)
JP (1) JP3935961B2 (fr)
AT (1) ATE214317T1 (fr)
DE (2) DE19644447C2 (fr)
HK (1) HK1027774A1 (fr)
WO (1) WO1998018587A2 (fr)

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Publication number Priority date Publication date Assignee Title
WO2011138422A2 (fr) 2010-05-05 2011-11-10 Gühring Ohg Acier de la métallurgie des poudres

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US6726085B2 (en) * 2002-05-14 2004-04-27 The Boeing Company Method and apparatus for producing a refined grain structure
DE10229325B4 (de) * 2002-06-29 2005-06-09 Arno Friedrichs Strangpresswerkzeug zur Herstellung eines aus plastischer Masse bestehenden zylindrischen Körpers
DE10229326A1 (de) * 2002-06-29 2004-01-29 Arno Friedrichs Strangpresswerkzeug zur Herstellung eines aus plastischer Masse bestehenden zylindrischen Körpers
DE602004028726D1 (de) * 2003-06-04 2010-09-30 Seco Tools Ab Verfahren und vorrichtung zur herstellung eines zuschnitts für ein werkzeug
US20060024140A1 (en) * 2004-07-30 2006-02-02 Wolff Edward C Removable tap chasers and tap systems including the same
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WO1998018587A3 (fr) 2002-11-21
JP2002514138A (ja) 2002-05-14
DE19644447A1 (de) 1998-04-30
HK1027774A1 (en) 2001-01-23
JP3935961B2 (ja) 2007-06-27
ATE214317T1 (de) 2002-03-15
US6248277B1 (en) 2001-06-19
DE59706644D1 (de) 2002-04-18
WO1998018587A2 (fr) 1998-05-07
EP1017527A1 (fr) 2000-07-12

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