EP0622141B1 - Closure for single or multifilamentary composite billet - Google Patents

Closure for single or multifilamentary composite billet Download PDF

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Publication number
EP0622141B1
EP0622141B1 EP19940400893 EP94400893A EP0622141B1 EP 0622141 B1 EP0622141 B1 EP 0622141B1 EP 19940400893 EP19940400893 EP 19940400893 EP 94400893 A EP94400893 A EP 94400893A EP 0622141 B1 EP0622141 B1 EP 0622141B1
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EP
European Patent Office
Prior art keywords
billet
grooves
closure part
tubular body
closure
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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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EP19940400893
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German (de)
French (fr)
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EP0622141A1 (en
Inventor
François Peltier
Hoang Gia Ky
Mougenot Pascal
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GEC Alsthom Intermagnetics SA
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GEC Alsthom Intermagnetics SA
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    • 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
    • B22F3/12—Both compacting and sintering
    • B22F3/1208—Containers or coating used therefor
    • B22F3/1258—Container manufacturing

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Description

La présente invention concerne une pièce de fermeture de billette composite mono-ou multifilamentaire selon le préambule de la revendication 1.The present invention relates to a closure part single or multifilament composite billet according to the preamble of claim 1.

Le procédé de fabrication de brins mono-ou multifilamentaires (conducteurs supraconducteurs ou autres) comprend une opération d'assemblage de plusieurs centaines ou milliers de tiges (par exemple un alliage de niobium et de titane dans une matrice du cuivre ou en alliage nickelcuivre) à l'intérieur d'une pièce cylindrique usinée. La pièce est obturée à ses deux extrémités par des couvercles, ou pièces de fermeture, de forme variable. Ces pièces de fermeture sont généralement emboítées dans l'alésage de la pièce cylindrique et soudées à celle-ci. On obtient ainsi une billette prête pour le filage.The process for manufacturing single or double strands multifilament (superconductive or other conductors) includes an assembly operation of several hundred or thousands of rods (for example a niobium alloy and titanium in a copper or nickel-copper alloy matrix) inside a machined cylindrical part. The part is closed at its two ends by covers, or closing parts, of variable shape. These pieces of closure are generally fitted into the bore of the cylindrical part and welded thereto. We thus obtain a billet ready for spinning.

Pour obtenir une meilleure cohésion du produit après extrusion, la billette ainsi constituée doit subir une opération de compactage isostatique, à chaud ou à froid, après la fermeture des couvercles par soudage. A cause de la rigidité radiale des pièces de fermeture, le compactage de la pièce cylindrique ne se réalise pas partout de manière uniforme. Les zones du cylindre proches des zones des pièces de fermeture sont moins compactées que les autres parties de la billette et la cylindricité peut être notablement affectée. Le produit obtenu après extrusion comportera donc un manque de cohésion à ces endroits.To obtain a better cohesion of the product after extrusion, the billet thus formed must undergo a isostatic compacting operation, hot or cold, after closing the covers by welding. Because of radial stiffness of the closure parts, compaction of the cylindrical part is not produced everywhere so uniform. Cylinder areas close to parts areas are less compacted than the other parts of the billet and the cylindricity can be notably affected. The product obtained after extrusion will therefore include a lack of cohesion in these places.

L'invention permet de remédier à cet inconvénient. A cet effet, les couvercles sont pourvus de rainures intérieure et extérieure autorisant une déformation radiale des couvercles lors du compactage isostatique.The invention overcomes this drawback. AT for this purpose the covers are provided with grooves interior and exterior allowing radial deformation covers during isostatic compaction.

L'invention a donc pour objet une pièce de fermeture de billette composite mono-ou multifilamentaire, la billette étant constituée d'un corps tubulaire rempli d'un ou de plusieurs composants cylindriques, chaque extrémité du corps tubulaire étant obturée par ladite pièce de fermeture qui présente deux faces principales, une première face principale fermant l'intérieur du corps tubulaire et une deuxième face principale opposée à la première, caractérisée en ce que chacune des deux faces principales est pourvue d'une rainure refermée sur elle-même, l'une des rainures entourant l'autre, la profondeur des rainures étant telle qu'elles se chevauchent.The invention therefore relates to a closure part of single or multifilament composite billet, the billet consisting of a tubular body filled with one or more multiple cylindrical components, each end of the body tubular being closed by said closure piece which has two main sides, a first side main closing the inside of the tubular body and a second main face opposite the first, characterized in that each of the two main faces is provided a groove closed on itself, one of the grooves surrounding the other, the depth of the grooves being such that they overlap.

Les rainures peuvent être circulaires et concentriques à l'axe du corps tubulaire lorsque la pièce de fermeture obture le corps tubulaire. Ceci facilite leur réalisation.The grooves can be circular and concentric to the axis of the tubular body when the closure piece closes the tubular body. This facilitates their realization.

Les rainures sont avantageusement des rainures droites.The grooves are advantageously grooves straight.

La largeur des rainures et la distance les séparant sont de préférence telles que, après une opération de compactage isostatique de la billette, les rainures se trouvent complètement ou partiellement rebouchées par la matière constituant la pièce de fermeture. Ceci procure un compactage le plus homogène possible pour l'ensemble de la billette.The width of the grooves and the distance between them are preferably such that, after an operation of isostatic compaction of the billet, the grooves are are completely or partially closed by the material constituting the closure part. This provides a as homogeneous compaction as possible for the entire billet.

La pièce de fermeture peut être pourvue d'un tube de pompage.The closing part can be provided with a tube of pumping.

L'invention sera mieux comprise et d'autres avantages et particularités apparaítront à la lecture de la description qui va suivre, donnée à titre non limitatif, accompagnée des dessins annexés parmi lesquels :

  • la figure 1 est une vue comprenant une demi-coupe et représentant une billette multifilamentaire selon l'art connu avant l'opération de compactage isostatique,
  • les figures 2, 3 et 4 illustrent la billette représentée à la figure 1 après l'opération de compactage isostatique,
  • les figures 5 et 6 représentant des pièces de fermeture de billette selon l'invention,
  • les figures 7, 8 et 9 illustrent une billette équipée de pièces de fermeture selon l'invention, après l'opération de compactage isostatique.
The invention will be better understood and other advantages and features will appear on reading the description which follows, given without limitation, accompanied by the appended drawings among which:
  • FIG. 1 is a view comprising a half-section and representing a multifilament billet according to the known art before the isostatic compacting operation,
  • FIGS. 2, 3 and 4 illustrate the billet shown in FIG. 1 after the isostatic compacting operation,
  • FIGS. 5 and 6 showing billet closure parts according to the invention,
  • Figures 7, 8 and 9 illustrate a billet equipped with closure parts according to the invention, after the isostatic compacting operation.

La billette représenté à la figure 1 est classiquement utilisée pour la fabrication d'un brin multifilamentaire. Elle est formée de tiges hexagonales 1 composées de filaments de NbTi ou d'alliages métalliques noyés dans une matrice de cuivre ou d'autres alliages ou métaux conducteurs. Les tiges 1 sont assemblées dans un corps tubulaire 2 en cuivre par exemple. Chaque extrémité du corps tubulaire 2 est obturé par une pièce de fermeture plate 3, 4. Ces pièces 3 et 4 s'emboítent dans l'alésage du corps tubulaire 2. La pièce de fermeture 3 est pourvue d'un tube de pompage 5 permettant de faire le vide d'air à l'intérieur de la billette. Les pièces de fermeture sont soudées sur le corps tubulaire selon leur joint de manière à rendre la billette hermétique.The billet shown in Figure 1 is conventionally used for the manufacture of a multifilament strand. It is formed of hexagonal rods 1 composed of filaments of NbTi or metallic alloys embedded in a matrix of copper or other alloys or metals conductors. Rods 1 are assembled in a body tubular 2 made of copper for example. Each end of the body tubular 2 is closed by a flat closing piece 3, 4. These parts 3 and 4 fit into the bore of the body tubular 2. The closing piece 3 is provided with a tube pumping 5 to make the air vacuum inside from the billet. The closure parts are welded to the tubular body according to their joint so as to make the Hermetic billet.

Une fois que la billette est scellée, celle-ci subit une opération de compactage isostatique.Once the billet is sealed, it undergoes an isostatic compacting operation.

Avec une telle billette, le compactage du corps tubulaire sur les tiges ne se réalise pas de façon uniforme aux extrémités de la billette. La rigidité des pièces de fermeture est à l'origine de ce défaut. C'est ce que représentent les figures 2 à 4.With such a billet, the compaction of the body tubular on the rods is not carried out uniformly at the ends of the billet. The rigidity of the pieces of closing is the cause of this fault. That's what represent Figures 2 to 4.

Le compactage isostatique a déformé certaines parties de la billette comme cela est visible sur la figure 2. Le corps tubulaire a vu son diamètre externe se réduire quelque peu à l'exception de ses extrémités dont le compactage n'a pu se réaliser à cause des pièces 3 et 4. La partie centrale de chaque pièce de fermeture a été également légèrement enfoncée sauf leur périphérie.Isostatic compaction has distorted parts of the billet as seen in Figure 2. The tubular body has seen its external diameter shrink somewhat with the exception of its ends, the compaction of which has not could be done because of parts 3 and 4. The central part of each closure piece was also slightly pressed except their periphery.

La figure 3, qui est une vue agrandie d'une partie d'extrémité périphérique de la billette, montre bien le manque d'homogénéité du compactage à cet endroit. Les tiges 1 sont courbées et un vide 6 subsiste entre les tiges et le corps tubulaire 2. Figure 3, which is an enlarged view of part peripheral end of the billet, clearly shows the lack of homogeneity of compaction at this location. The stems 1 are curved and a vacuum 6 remains between the rods and the tubular body 2.

La figure 4 représente la billette vue par la pièce de fermeture 4. Les cercles en traits interrompus représentent la circonférence interne du corps tubulaire 2 dans la partie centrale de la billette, c'est le cercle 7, et dans les parties d'extrémité, c'est le cercle 8.Figure 4 shows the billet seen by the part of closure 4. The circles in dashed lines represent the internal circumference of the tubular body 2 in the part center of the billet, this is circle 7, and in the end parts, this is circle 8.

A la figure 5, une pièce de fermeture 11, selon l'invention, comporte deux faces principales 12 et 13. Dans cet exemple de réalisation, la pièce 11 est plane et circulaire. Elle est représentée en demi-coupe. La pièce 11 possède un épaulement 14 qui facilite son emboítage dans le corps tubulaire de la billette. Lors de la fermeture de la billette, la face 13 est donc en vis-à-vis des extrémités des tiges. La face 13 est pourvue d'une rainure circulaire 15 concentrique et de section droite. La face 12 est pourvue d'une rainure 16 de forme similaire à la rainure 15 mais entourée par cette dernière. La profondeur de chaque rainure est telle que les rainures se chevauchent. Il existe entre elles une couronne de séparation 17.In FIG. 5, a closing part 11, according to the invention has two main faces 12 and 13. In this embodiment, the part 11 is flat and circular. It is represented in half-section. Room 11 has a shoulder 14 which facilitates its fitting into the tubular body of the billet. When closing the billet, the face 13 is therefore opposite the ends stems. The face 13 is provided with a circular groove 15 concentric and cross section. Face 12 is provided a groove 16 similar in shape to groove 15 but surrounded by the latter. The depth of each groove is such that the grooves overlap. There are between they a separation crown 17.

A la figure 6, une autre pièce de fermeture 21, selon l'invention, comporte deux faces principales 22 et 23. Dans cet exemple de réalisation, la pièce 21 est plane et circulaire. Elle est représentée en demi-coupe. La pièce 21 possède un épaulement 24 qui facilite son emboítage dans le corps tubulaire de la billette. Lors de la fermeture de la billette, la face 23 est donc en vis-à-vis des extrémités des tiges. La face 23 est pourvue d'une rainure circulaire 25 concentrique et de section droite. La face 22 est pourvue d'une rainure 26 de forme similaire à la rainure 25 mais entourée par cette dernière. La profondeur de chaque rainure est telle que les rainures se chevauchent. Il existe entre elles une couronne de séparation 27. La pièce 21 est pourvue axialement d'un queusot 28 qui permet de faire le vide d'air dans la billette.In FIG. 6, another closing part 21, according to the invention has two main faces 22 and 23. In this embodiment, the part 21 is flat and circular. It is represented in half-section. Room 21 has a shoulder 24 which facilitates its fitting into the tubular body of the billet. When closing the billet, the face 23 is therefore opposite the ends stems. Face 23 is provided with a circular groove 25 concentric and cross section. Face 22 is provided a groove 26 similar in shape to groove 25 but surrounded by the latter. The depth of each groove is such that the grooves overlap. There are between they a separation crown 27. The part 21 is provided axially of a shank 28 which makes it possible to create an air vacuum in the billet.

Les pièces de fermeture peuvent être du même métal ou alliage que le corps tubulaire ou de nature différente. The closure parts can be of the same metal or alloy than the tubular body or of a different nature.

Une billette équipée de pièces de fermeture telles que les pièces 11 et 21 permet au corps tubulaire de se déformer de manière uniforme tant au centre qu'à ses extrémités. Cette déformation rend le compactage homogène sur toute la longueur du corps. Elle permet un meilleur écoulement des produits lors de l'opération d'extrusion qui va suivre. C'est ce que montrent les figures 7 à 9.A billet equipped with closure parts such as parts 11 and 21 allow the tubular body to deform uniformly both at the center and at its ends. This deformation makes the compaction homogeneous over the entire body length. It allows a better flow of products during the extrusion operation which will follow. This is shown in Figures 7 to 9.

Le compactage isostatique a déformé de manière uniforme le corps tubulaire 2 comme cela est visible sur la figure 7. Son diamètre interne s'est réduit de façon uniforme. C'est ce qu'indique le cercle 31 en traits interrompus sur la figure 9 qui représente la billette vue par la pièce de fermeture 11.Isostatic compaction has distorted so uniform the tubular body 2 as can be seen on the figure 7. Its internal diameter has shrunk so uniform. This is indicated by the circle 31 in lines interrupted in FIG. 9 which represents the billet seen by the closing part 11.

La figure 8, qui est une vue agrandie d'une partie d'extrémité périphérique de la billette, montre bien l'homogénéité du compactage à cet endroit. Les tiges 1 sont droites et aucun vide ne subsiste entre les tiges et le corps tubulaire 2.Figure 8, which is an enlarged view of part peripheral end of the billet, shows well the homogeneity of compaction at this location. Rods 1 are straight and no void remains between the rods and the tubular body 2.

En dimensionnant correctement les rainures, c'est-à-dire leur largeur et l'épaisseur de la couronne 17 ou 27 qui les sépare, on réalise au mieux le compactage. Il faut en effet, pour obtenir le meilleur résultat, que les pièces de fermeture puissent se comprimer radialement de la valeur voulue. D'une part la déformation des pièces de fermeture doit être suffisante pour obtenir un compactage uniforme des tiges. D'autre part il ne faut pas altérer l'étanchéité de la billette. Ceci se constate sur la figure 7 où l'on voit que les rainures 15, 16 de la pièce de fermeture 11 et 25, 26 de la pièce de fermeture 21 sont pratiquement refermées. Le léger enfoncement axial des pièces de fermeture, dû au compactage isostatique, a provoqué la fermeture des rainures 16 et 26 sur les faces principales externes 12 et 22 des pièces de fermeture. Ainsi sur la figure 9, la rainure 16 est devenue un simple trait.By correctly dimensioning the grooves, i.e. their width and the thickness of the crown 17 or 27 which separates them, compaction is best achieved. It takes effect, to get the best result, that the pieces of closure can compress radially from the value wanted. On the one hand, the deformation of the closure parts must be sufficient to obtain uniform compaction of the stems. On the other hand, the watertightness of the the billet. This is seen in Figure 7 where we see that the grooves 15, 16 of the closure part 11 and 25, 26 of the closing part 21 are practically closed. The slight axial depression of the closure parts, due to isostatic compaction, caused the grooves to close 16 and 26 on the main external faces 12 and 22 of the closing parts. Thus in FIG. 9, the groove 16 has become a simple trait.

L'invention permet donc d'obtenir après compactage une billette de meilleure qualité. Ceci augmente le rendement global de la billette après transformation. Un autre avantage réside dans le fait qu'il n'est plus nécessaire d'effectuer une retouche d'usinage du corps tubulaire, après l'opération de compactage, pour permettre l'extrusion. En effet, le corps tubulaire étant compacté de manière uniforme, il peut entrer sans problème dans le conteneur d'extrusion.The invention therefore makes it possible to obtain, after compaction, a better quality billet. This increases the yield overall billet after processing. Another advantage is that it is no longer necessary to carry out a machining rework of the tubular body, after the compacting operation, to allow extrusion. In effect, the tubular body being compacted so uniform, it can easily enter the container extrusion.

La description a porté sur des pièces de fermeture plates mais l'invention s'applique également à des pièces de fermeture possédant d'autres formes, par exemple avec ou sans cône interne ou externe.The description relates to closure parts flat but the invention also applies to parts of closure having other shapes, for example with or without internal or external cone.

Claims (5)

  1. A closure part for closing a mono- or multi-filament compound billet, the billet being constituted by a tubular body (2) filled with one or more cylindrical components, each end of the tubular body being closed by said closure part (11, 21) which presents two main faces, a first main face (13, 23) closing the inside of the tubular body, and a second main face (12, 22) opposite the first, the closure part being characterized in that each of the two main faces is provided with a closed loop groove (15, 16, 25, 26), one of the grooves surrounding the other, the depth of the grooves being such that they overlap.
  2. A closure part according to claim 1, characterized in that the grooves (15, 16, 25, 26) are circular and concentric to the axis of the tubular body (2) when the closure part closes the tubular body.
  3. A closure part according to claim 1, characterized in that the grooves (15, 16, 25, 26) are straight grooves.
  4. A closure part according to any one of claims 1 to 3, characterized in that the width of the grooves and the distance between them are such that, after an isostatic densification operation of the billet, the grooves become completely or partly filled in by the material constituting the closure part.
  5. A closure part according to any one of claims 1 to 4, characterized in that it is provided with a pumping tube (28).
EP19940400893 1993-04-29 1994-04-26 Closure for single or multifilamentary composite billet Expired - Lifetime EP0622141B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9305090 1993-04-29
FR9305090A FR2704465B1 (en) 1993-04-29 1993-04-29 Mono or multifilament composite billet closure piece.

Publications (2)

Publication Number Publication Date
EP0622141A1 EP0622141A1 (en) 1994-11-02
EP0622141B1 true EP0622141B1 (en) 1998-03-25

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EP19940400893 Expired - Lifetime EP0622141B1 (en) 1993-04-29 1994-04-26 Closure for single or multifilamentary composite billet

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EP (1) EP0622141B1 (en)
DE (1) DE69409150T2 (en)
FI (1) FI100865B (en)
FR (1) FR2704465B1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE441336B (en) * 1978-10-26 1985-09-30 Nyby Uddeholm Ab Capsule for the cylindrical presses for extrusion
SE455383B (en) * 1986-11-14 1988-07-11 Uddeholm Tooling Ab KEEP ON CONSOLIDATION OF METAL POWDER IN A FLAT Capsule AND INFECTED SUBJECT
US5137663A (en) * 1990-08-13 1992-08-11 Vital Force, Inc. Process and container for encapsulation of workpieces for high pressure processing
GB2257161A (en) * 1991-06-25 1993-01-06 Shell Int Research Process of forming a metal article.

Also Published As

Publication number Publication date
FI941953A (en) 1994-10-30
FR2704465B1 (en) 1995-06-23
DE69409150D1 (en) 1998-04-30
FR2704465A1 (en) 1994-11-04
FI100865B (en) 1998-03-13
DE69409150T2 (en) 1998-07-16
EP0622141A1 (en) 1994-11-02
FI941953A0 (en) 1994-04-27

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