EP0718052B1 - Matrice d'extrusion de corps creux - Google Patents

Matrice d'extrusion de corps creux Download PDF

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Publication number
EP0718052B1
EP0718052B1 EP94309524A EP94309524A EP0718052B1 EP 0718052 B1 EP0718052 B1 EP 0718052B1 EP 94309524 A EP94309524 A EP 94309524A EP 94309524 A EP94309524 A EP 94309524A EP 0718052 B1 EP0718052 B1 EP 0718052B1
Authority
EP
European Patent Office
Prior art keywords
die
male
female
forming
bridge
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
Application number
EP94309524A
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German (de)
English (en)
Other versions
EP0718052A1 (fr
Inventor
Sadahide Yano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
YANO ENGINEERING YK
Original Assignee
YANO ENGINEERING YK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by YANO ENGINEERING YK filed Critical YANO ENGINEERING YK
Priority to EP94309524A priority Critical patent/EP0718052B1/fr
Priority to AT94309524T priority patent/ATE194785T1/de
Priority to DE69425329T priority patent/DE69425329T2/de
Publication of EP0718052A1 publication Critical patent/EP0718052A1/fr
Application granted granted Critical
Publication of EP0718052B1 publication Critical patent/EP0718052B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the present invention relates to a die assembly for use to extrude hollow articles of a metal such as aluminum (see for example CH-A-400 063).
  • the material to be extruded from the prior art die assembly has to flow through the port holes 75 penetrating the male die base 73. Accordingly, a higher pressure must be applied to the material to overcome a strong frictional resistance.
  • An object of the present invention made in view of such drawbacks is therefore to provide a die assembly adapted to extrude hollow articles of a higher accuracy in dimension and free from any uneven wall thickness.
  • a die assembly adapted to extrude hollow articles of an extrudable material, the assembly comprising at least one male die for defining a hollow space through each article and at least one female die for defining an outer periphery of each article, characterised in that:
  • the bridge is usually made integral with the annular base, and protrudes rearwardly from a rear face thereof reversely to the flow of the extrudable material.
  • the male and female dies are preferably made of an appropriate hard material such as a hard metal (viz. cemented carbide) and ceramics, in order to prevent their undesirable distortion during an extrusion process.
  • a hard metal viz. cemented carbide
  • ceramics in order to prevent their undesirable distortion during an extrusion process.
  • a forming slit defined between the male die and the female die is desirably located at or proximate the rear face of the annular base.
  • the female die may be a short columnar and integral piece.
  • the forming lug of the male die may be a core such that this core and the bridge are discrete members mating one another, and an aperture may penetrate the bridge in a fore and aft direction so as to receive the core in such a state that a forming end thereof protrudes forwardly of the bridge, with the core capable of being removed therefrom in a rearward direction.
  • the female die in one mode of the invention may comprise a bearing tip made of a thin plate. This plate of a thickness substantially equal to a length of a bearing region of the forming hole may be supported at its periphery and rear surface by a tip holder composed of mold members.
  • a die assembly adapted to extrude hollow articles of an extrudable material, the assembly comprising a plurality of male dies, a die holder for holding the male dies and a plurality of female dies shrinkage fitted in annular bases of the respective male dies, characterised in that:
  • the die assembly may additionally comprise a flow regulating block disposed in rear of the die holder, viz. upstream of the flow of extrudable material.
  • This block may have discrete bridging portions in which through holes are formed for flowing the extrudable material, and each bridging portion is located preferably a small distance behind the corresponding bridge of the male die.
  • a hollow article to be extruded by any of the die assemblies is a flat and perforated aluminum tube 1.
  • This tube shown in Fig. 14 is used to construct a heat exchanger for use in air conditioners.
  • Each die assembly in the embodiments is adapted to extrude in harmony a plurality of such tubes.
  • Each male die 2 serves to form at least one bore extending through the extrudate, and is composed of an annular base 7, a bridge 8 and a forming lug 9 as shown in Figs. 2 to 5.
  • the annular base 7 is made of an extremely hard material such as a hard metal or ceramics.
  • An axial bore 10 penetrating the annular base has an annular and step-shaped shoulder 11. This shoulder faces towards the female die and is located upstream of an extruded material flow.
  • the bore has a forward and large-diameter region in front of the shoulder 11, and this region serves as a recess 12 for receiving the female die.
  • Key ways 13 are formed in axial direction of the recess 12 and in an inner periphery thereof, so that the female die 3 can be set at a predetermined angular position within said recess.
  • An annular step 15 is formed along a rear peripheral edge of the base 7.
  • Four openings 16 are formed through the annular base at regular angular intervals so as to receive four positioning knockout pins.
  • the bridge 8 for receiving and holding the forming lug 9 at a correct position is also made of the same hard material ( viz. hard metal or ceramics ) as the annular base 7, which is integral with this bridge.
  • the bridge 8 protrudes rearwardly from the annular base 7 and across the axial bore 10.
  • a middle portion of this bridge has a frontal end located behind the annular shoulder 11 of the axial bore 10, with respect to the extruding direction.
  • An aperture 18 penetrating the bridge 8 in a fore and aft direction is slit-shaped to receive and hold the forming lug 9.
  • Shallow grooves 19 are formed in opposite side surfaces of the aperture, to extend forwardly from its rear end to a middle depth so as terminate as small stopping walls 20 bearing against the inserted knockout pin.
  • the middle portion of the bridge 8 has a forward end chamfered as shown in Fig. 3.
  • the thus reduced thickness of the forward end allows to the extruded material to smoothly pass by said forward end of the middle portion.
  • a core 22 formed integral with the forming lug 9 cooperates with a supporting pin 23 to position this lug at its correct position within the male die 2.
  • the core 22 shaped as a generally square plate serving to form the hollow space in the tube 1 is made of a hard material such as a hard metal or ceramics.
  • a forward extremity of the core is the forming lug 9 of a comb-like shape.
  • a hole 24 formed transversely through a portion near a rear end of the core is round to receive the supporting pin.
  • the supporting pin 23 functioning to position the core 22 in the bridge 8 is also made of a hard material such as a hard metal or ceramics.
  • This pin 23 is inserted in the transverse hole 24, such that opposite ends of said pin jut from the side surfaces of core.
  • the core 22 is inserted into the aperture 18 of the bridge 8 from its rear end, the opposite ends of the supporting pin 23 will come into contact with the small stopping walls 20 as the foremost ends of the shallow grooves 19 formed in the aperture 18.
  • the core 22 is placed in the bridge 8 in such a state that an operator can rearwardly pull the core out of the bridge 8.
  • this lug juts forwardly of the forward end of the bridge's middle portion.
  • the female die 3 for defining the outer periphery of the extruded tube 1 is also made of a hard material such as a hard metal or ceramics.
  • the female die is a short and integral columnar piece, and the forming hole pierced through and centrally of this female die consists of a bearing portion or region 26 and a relief region 27 communicating therewith and continuing therefrom.
  • the bearing portion 26 is located proximate the rear face of the female die.
  • the shrinkage-fitted female die 3 has its rear face proximate the bearing portion 26 and supported on the annular shoulder 11. Therefore, the female die is set in place at its correct position relative to the annular base such that the forming lug 9 is disposed in the bearing portion 26. Thus, a forming slit 28 is defined between those lug 9 and portion 26 and near the rear face of the annular base 7.
  • a fusion chamber 29 behind the forming slit 28 is located upstream of the extrusion flow, so that tributaries thereof that have been separated by the bridge 8 will join one another in this chamber 29, before extruded through the slit.
  • Keys 30 formed on axially of the female die outer periphery are shaped to fit in the respective key ways 13 of the recess 12, whereby the female die 3 takes a correct angular position relative to the male die 2.
  • the die holder 4 for holding the two male dies 2 and 2 is a large-diameter disc made of an appropriate steel such as a die steel.
  • Two cylindrical apertures 32 and 32 extend side by side and through the die holder so as to respectively receive the male dies.
  • Annular step 33 formed in each aperture 32 at its middle region does face towards the frontal surface of the die holder. Therefore, each male die 2 will be inserted in the aperture, from its front side towards its rear side, until the annular step 15 of the male die rests on that 33 in the aperture. Tight contact of the former step 15 with the latter 33 ensures an air-tight seal to prevent leakage of the material that is being extruded.
  • the flow regulating block 5 which is also a large-diameter disc made of a die steel or the like, serves to regulate the flow of extrudable material fed from a container to the forming slits 28.
  • Bridging portions 36 cross one another to divide a central cavity of this block into four discrete paths 37.
  • a small gap is left between each bridging potion 36 and the corresponding one of the male die bridges 8.
  • Front recesses 38 formed in frontal surface of the flow regulating block 5 tightly receive the male dies 2. With said block 5 disposed behind and secured to the die holder 4, bottoms of the die receiving recesses 38 of the former are spaced a small distance from the rear faces of the bridges 8.
  • a circular cutout 39 formed at frontal face of and around this block 5 fits on the circular protrusion 34 of the die holder 4, so that said block and holder can readily and exactly be aligned with one another.
  • the back-up block 6 is likewise made of a die steel or the like, and has relief holes 40 arranged coaxially with the respective forming slits 28.
  • An entrance opening of each relief hole 40 is smaller than the outer periphery of the female die 3.
  • a rear face of this back-up block 6 fixed to the die holder frontal face does support all the frontal faces of male dies 2, female dies 3 and die holder 4, while permitting the extrudable material to flow forwards.
  • Openings 41 are formed around each relief hole 40, in alignment with those 16 of the male dies 2 so that knockout pins 43 each fitted in the opening 41 and the corresponding one 16 can correctly position the male dies on the back-up block.
  • each female die 3 is in an aligned contact with the corresponding male die 2, at its portion close to the forming slit 28.
  • This feature is advantageous in that any distortion that the extrudable material such as aluminum might cause to male and/or female dies would scarcely result in misalignment of the bearing portion 26 with the forming lug 9. Thus, any intolerable variation in wall thickness will be prevented from being produced in each extruded tube 1.
  • This advantage may be of benefit particularly to a case wherein a larger number of couples of the male and female dies are equipped in one assembly to render larger its overall size. Contact portions of the coupled male and female dies are always kept close to the forming slit, thereby affording the described advantage.
  • the female dies respectively inserted in the male dies can be made of a so small size that they can be replaced with new ones at a lower cost, when worn out.
  • the material being extruded need not to flow though the prior art port holes 75 surrounded by walls.
  • the reduced contact area of the flowing material only with the bridge 8 is effective to lower the pressure required to extrude the material.
  • the extrusion speed as well as the speed at which a solid raw material is forced into the container can now be raised to improve productivity of the tube 1.
  • the forming slit 28 formed near the rear face of the male die annular base 7 is located at a middle region intermediate the frontal and rear ends of each assembly of male and female dies 2 and 3. Therefore, an error in coaxiality of them is diminished to further improve the dimensional accuracy of extruded hollow articles.
  • An abraded forming lug 9 and/or bearing portion 26 can easily be taken out of the assembly, for replacement with new ones, by removing the male die together with the female from the die holder 4.
  • a relatively loose fitting of the male dies 2 in the die holder suffices well to assure a strict alignment of the female die 3 with the male die 2. Therefore, removal of the couple of them is so easy as to facilitate the disassembling and reassembling of the composite die.
  • annular steps 15 and 33 of the die holder 4 and each male die 2 bear against each other so tightly that the material being extruded is prevented from leaking outwardly through a gap present between the male die 2 comparatively loosely fitted in the holder 4.
  • a die assembly provided in a second embodiment shown in Figs. 8A and 8B comprises female dies 3 of a length equal to that of the annular bases 7 of male dies 2, and a sufficient forming cavity 28 is formed behind and proximate the rear face of each annular base.
  • An annular step 33 formed in the aperture 32 of a die holder 4 is located nearer the rear face thereof, than that in the first embodiment.
  • the step-shaped shoulder 11 is dispensed with which the axial bore 10 in the first embodiment has.
  • the forming slit 28 is however similarly disposed adjacent to the rear face of the annular base 7 and within the bore.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)

Claims (8)

  1. Ensemble formant filière adapté pour extruder des articles creux réalisés à partir d'un matériau extrudable (1), l'ensemble comprenant au moins une filière mâle (2) pour définir un espace creux à travers chaque article et au moins une filière femelle (3) pour définir une périphérie extérieure de chaque article,
    caractérisé en ce que :
    la filière mâle se compose d'une base annulaire (7), d'un ergot de formation (9) et d'un pont (8) pour fixer l'ergot de formation (9) à la base annulaire (7) ;
    la filière femelle (3) possède un trou de formation (26), la filière femelle (3) étant configurée pour être ajustée par contraction dans un évidement de réception (12) formé dans la filière mâle (2) correspondante ;
    ledit pont (8) de fixation de l'ergot de formation (9) s'étend derrière la base annulaire (7) sans aucune autre partie autour pour réduire la zone de contact du matériau qui s'écoule ; et
    ledit trou de formation (26) est formé à proximité d'une face arrière de ladite base annulaire (7) et est situé dans une région se trouvant entre les extrémités avant et arrière desdites filières mâle et femelle (2, 3).
  2. Ensemble formant filière selon la revendication 1, caractérisé en ce que le pont (8) est réalisé d'un seul tenant avec la base annulaire (7) et fait saillie vers l'arrière depuis une face arrière de celui-ci, dans une direction opposée à l'écoulement du matériau extrudable (1).
  3. Ensemble formant filière selon la revendication 1 ou 2, caractérisé en ce que la filière mâle (2) et la filière femelle (3) sont réalisées à partir d'un matériau dur choisi entre un métal dur et une céramique.
  4. Ensemble formant filière selon la revendication 1, 2 ou 3, caractérisé en ce qu'une fente de formation (28) est définie entre la filière mâle (2) et la filière femelle (3) et est située sur ou à proximité de la face arrière de la base annulaire (7).
  5. Ensemble formant filière selon la revendication 4, caractérisé en ce que la filière femelle (3) est un élément court en forme de colonne et d'un seul tenant.
  6. Ensemble formant filière selon la revendication 4, dans lequel l'ergot de formation (9) de la filière mâle (2) est un noyau (22) et ce noyau (22) et le pont (8) sont des éléments discrets s'accouplant l'un avec l'autre, et une ouverture (18) traverse le pont (8) dans une direction avant et arrière afin de recevoir le noyau (22) dans un état tel qu'une extrémité de formation de celui-ci dépasse vers l'avant du pont (8), le noyau (22) étant capable d'être retiré de celle-ci dans une direction arrière, et caractérisé en ce que la filière femelle (3) combinée à la filière mâle (2) se compose d'un support de pointe (49, 50) et d'une pointe d'appui (48) réalisée à partir d'une plaque mince d'une épaisseur sensiblement égale à une longueur d'une région d'appui du trou de formation (26), et la pointe d'appui (48) est supportée à sa périphérie et sur sa surface arrière par le support de pointe (49, 50).
  7. Ensemble formant filière adapté pour extruder des articles creux réalisés dans un matériau extrudable (1), l'ensemble comprenant une pluralité de filières mâles (2), un support de filière (4) pour supporter les filières mâles (2) et une pluralité de filières femelles (3) ajustées par contraction dans des bases annulaires (7) des filières mâles respectives (2),
    caractérisé en ce que :
    chaque filière mâle (2) se compose de la base annulaire (7), d'un ergot de formation (9) et d'un pont (8) pour fixer l'ergot de formation (9) dans la base annulaire (7) ;
    le support de filière (4) possède des ouvertures (32) dans lesquelles les filières mâles (2) respectives s'insèrent pour être maintenues en place ;
    ledit pont (8) pour fixer l'ergot de formation (9) s'étend derrière la base annulaire (7) sans aucune autre partie autour pour réduire la zone de contact du matériau qui s'écoule ; et
    un trou de formation (26) de chaque filière femelle (3) est formé à proximité d'une face arrière de ladite base annulaire (7) et est situé dans une région se trouvant entre les extrémités avant et arrière desdites filières mâle et femelle (2, 3).
  8. Ensemble formant filière selon la revendication 7, comprenant en outre un bloc de régulation d'écoulement (5) disposé à l'arrière du support de filière (4) ; et des parties de liaison discrètes (36) dans lesquelles sont formés des trous traversants pour faire circuler le matériau extrudable (1), dans lequel chaque partie de liaison est située de préférence à une courte distance derrière le pont correspondant (8) de la filière mâle (2).
EP94309524A 1994-12-19 1994-12-19 Matrice d'extrusion de corps creux Expired - Lifetime EP0718052B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP94309524A EP0718052B1 (fr) 1994-12-19 1994-12-19 Matrice d'extrusion de corps creux
AT94309524T ATE194785T1 (de) 1994-12-19 1994-12-19 Matrize zum strangpressen von hohlkörpern
DE69425329T DE69425329T2 (de) 1994-12-19 1994-12-19 Matrize zum Strangpressen von Hohlkörpern

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP94309524A EP0718052B1 (fr) 1994-12-19 1994-12-19 Matrice d'extrusion de corps creux

Publications (2)

Publication Number Publication Date
EP0718052A1 EP0718052A1 (fr) 1996-06-26
EP0718052B1 true EP0718052B1 (fr) 2000-07-19

Family

ID=8217954

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94309524A Expired - Lifetime EP0718052B1 (fr) 1994-12-19 1994-12-19 Matrice d'extrusion de corps creux

Country Status (3)

Country Link
EP (1) EP0718052B1 (fr)
AT (1) ATE194785T1 (fr)
DE (1) DE69425329T2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09174141A (ja) * 1995-12-22 1997-07-08 Yano Eng:Kk 金属製中空材押出用ダイス

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2651411A (en) * 1948-10-16 1953-09-08 Revere Copper & Brass Inc Die for extrusion presses
US2811253A (en) * 1954-04-12 1957-10-29 Schloemann Ag Extrusion presses
CH400063A (de) * 1962-07-19 1965-10-15 Alusuisse Verfahren und Strangpresse für die Herstellung von Hohlprofilen
JP3014506B2 (ja) * 1991-08-29 2000-02-28 昭和アルミニウム株式会社 コンフォーム押出用ホローダイス

Also Published As

Publication number Publication date
ATE194785T1 (de) 2000-08-15
EP0718052A1 (fr) 1996-06-26
DE69425329D1 (de) 2000-08-24
DE69425329T2 (de) 2001-03-01

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