EP0216978B1 - Procédé et dispositif pour extruder des masses de carbone, en particulier des électrodes de carbone - Google Patents

Procédé et dispositif pour extruder des masses de carbone, en particulier des électrodes de carbone Download PDF

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Publication number
EP0216978B1
EP0216978B1 EP19850890266 EP85890266A EP0216978B1 EP 0216978 B1 EP0216978 B1 EP 0216978B1 EP 19850890266 EP19850890266 EP 19850890266 EP 85890266 A EP85890266 A EP 85890266A EP 0216978 B1 EP0216978 B1 EP 0216978B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
press
mouthpiece
pressure
strand
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
Application number
EP19850890266
Other languages
German (de)
English (en)
Other versions
EP0216978A1 (fr
Inventor
Aktiengesellschaft Voest-Alpine
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.)
Voestalpine AG
Original Assignee
Voestalpine AG
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 Voestalpine AG filed Critical Voestalpine AG
Publication of EP0216978A1 publication Critical patent/EP0216978A1/fr
Application granted granted Critical
Publication of EP0216978B1 publication Critical patent/EP0216978B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/22—Extrusion presses; Dies therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/22—Extrusion presses; Dies therefor
    • B30B11/224—Extrusion chambers

Definitions

  • the invention relates to a method for extruding carbon masses, in particular carbon electrodes, wherein the carbon mass introduced into a press cylinder with a closable mouthpiece is first compressed by means of a press ram with the mouthpiece closed and then pressed out of the press cylinder with the mouthpiece open, and to a device to carry out the method (DE-A-28 55 899).
  • the carbon mass Before carbon electrodes can be burned, the carbon mass must be shaped and compressed accordingly.
  • the carbon sleeve is placed in a press cylinder with a lockable mouthpiece and pre-compressed in this press cylinder with the mouthpiece closed using a press ram before the actual shaping and compression process can take place by squeezing out the carbon mass through the mouthpiece.
  • the quality of the later electrodes depends among other things on a uniform grain orientation of the mass particles in the press strand and on sufficient compression of the press strand. As has been shown, one of the conditions for a uniform grain alignment can be seen in an at least approximately constant exit speed of the press strand from the die of the press cylinder.
  • this exit speed of the press strand from the mouthpiece of the press cylinder depends on the press pressure exerted on the carbon mass via the press ram, so that only a certain press pressure may be applied for an advantageous exit speed range.
  • a desired grain orientation in the press strand can therefore only be ensured if a certain pressing force and, depending on it, a certain compression are maintained.
  • this compaction is generally not sufficient, so that in such cases vibration compaction in closed molds is adopted, although grain orientation cannot be achieved.
  • the invention is therefore based on the object of avoiding these deficiencies and of specifying a method for extruding carbon masses in which, in spite of good grain orientation, any desired compression of the extruded strand can be ensured.
  • the invention solves this problem in that a counter pressure to the pressing pressure is exerted on the strand of carbon mass emerging from the mouthpiece.
  • the exit speed when a back pressure is applied depends on the difference between the press pressure and the back pressure and this pressure difference can be easily adapted to the desired exit speed of the press strand from the mouthpiece, a compression pressure that is independent of the exit speed can be exerted on the carbon mass.
  • the increase in the exit speed, which is otherwise caused by an increase in the pressing pressure, is prevented by the correspondingly selected counter pressure, so that the pressing strand can emerge from the mouthpiece of the pressing cylinder at a speed which is advantageous for the desired orientation.
  • the effective squeezing pressure in the mouthpiece area increases with increasing press ram stroke, which results in an increasing exit speed.
  • the application pressure of the press ram would have to be controlled as a function of the press ram stroke. If it is not the action of the press ram but the counterforce that is controlled, namely in the sense of an increase in the counterpressure with increasing length of the press run, a constant exit speed for the press run can be achieved even if the press ram is acted on consistently.
  • a known device can be used (DE-A-28 55 899), which provides a guide sleeve arranged at a distance from the mouthpiece of the press cylinder for the press strand emerging from a vertically arranged press cylinder, in order to prevent deformation of the press strand during its removal avoid.
  • the press strand received by the guide sleeve is namely conveyed along with the guide sleeve.
  • the guide sleeve of such a device is designed as an axially displaceable pressure cylinder which can be tightly connected to the mouthpiece of the press cylinder and has a pressure stamp guided therein, a desired counterpressure to the pressure can be exerted on the press strand emerging from the mouthpiece of the press cylinder be because the jacket of the pressure cylinder effectively prevents radial deflection of the press strand.
  • the pressure stamp must of course be able to be pushed back over the emerging press strand without changing the position of the pressure cylinder. Is the ge reaches the desired length of the press strand, the pressure cylinder can be withdrawn axially from the mouthpiece in order to be able to sever the press strand.
  • the jacket of the pressure cylinder can have lubrication openings connected to at least one pressure line for a lubricant, through which the lubricant is pressed between the jacket of the pressure cylinder and the press strand.
  • the press strand In the case of a horizontal press cylinder arrangement, the press strand must be supported appropriately when pulling off the pressure cylinder.
  • adjustable support supports can be arranged outside the printing cylinder, which are pivoted or raised when the printing cylinder is pulled off the strand into the working position.
  • a particularly advantageous support of the press strand is obtained, however, when a support beam forming part of the inner wall for the press strand is guided axially displaceably in the jacket of the pressure cylinder, because in this case the press strand can remain on the support beam when the pressure cylinder is removed.
  • the support bracket is held stationary when the printing cylinder is removed and pulled out of the printing cylinder jacket.
  • the device shown for the extrusion of carbon electrodes essentially consists of a press cylinder 1 which has a mouthpiece 3 which can be closed by means of a cover 2 and which receives a press ram 4 in a displaceable manner.
  • a press cylinder 1 which has a mouthpiece 3 which can be closed by means of a cover 2 and which receives a press ram 4 in a displaceable manner.
  • an axially displaceable pressure cylinder 5 is provided, which can be connected tightly to the mouthpiece 3 of the press cylinder 1 and is provided with a pressure stamp 6.
  • the plunger 6 guided in the pressure cylinder 5 is acted upon accordingly and pressed against the carbon mass 7 in the region of the mouthpiece, as is indicated in FIG. 2. If the press ram 4 is now acted upon, the carbon mass 7 is pressed out of the mouthpiece 3 against the force of the pressure ram 6, the emerging press strand 8 being guided through the pressure cylinder 5, so that a corresponding counter pressure to the press pressure can be exerted via the pressure ram 6 .
  • a compression pressure which depends on the size of the pressing pressure and the size of the counterpressure by the pressure stamp 6, thus acts on the carbon mass 7 or the press strand 8.
  • the exit speed of the press strand 8 from the mouthpiece 3 is, however, independent of this compression pressure, because only the pressure difference between the back pressure and the pressure in the area of the mouthpiece 3 is decisive for the exit speed.
  • a comparatively low exit speed can therefore be ensured at very high compression pressures, so that the press strand 8 not only has a high compression rate, but also a desired grain orientation.
  • lubrication openings 9 are provided in the jacket of the pressure cylinder 5, which are connected to a pressure line 10 for a lubricant, so that the lubricant is conducted under the necessary pressure between the cylinder jacket and the press line 8 can be.
  • the pressure ram 6 is lifted off the press strand 8 and the pressure cylinder 5 is withdrawn from its working position according to FIG. 3 from the press strand 8 into the position according to FIG. 4 in order to be able to sever the press strand 8 with the help of the knives 11.
  • lifting supports 12 are provided according to FIG. 4, which are placed on the press strand 8 as soon as it is released by the pressure cylinder 5.
  • a support bracket 13 can also be provided, which is guided axially displaceably in an axial groove 14 of the jacket of the printing cylinder 5 and forms part of the inner wall of the printing cylinder 5, as shown in FIGS. 5 and 6.
  • the support bracket 13 therefore only needs to be held by means of a holder 15 when the pressure cylinder 5 is withdrawn from the mouthpiece 3 of the press cylinder 1 in order to pull it out of the pressure cylinder 5.
  • the press strand 8 consequently remains on the support bracket 13 without any relative movement during the pulling off of the pressure cylinder 5, so that uninterrupted support of the press strand 8 can be achieved.
  • the pressure cylinder 5 can be provided with an end recess 16 for the holder 15.
  • the arrangement must, of course, be such that the knives 11 can be used unhindered for severing the press strand 8. For this purpose, it may be necessary to shift the holder 15 in certain areas.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)

Claims (5)

1. Procédé d'extrusion de pâtes de carbone, en particulier d'électrodes de carbone, dans lequel la pâte de carbone introduite dans un cylindre de presse (1 ), équipé d'une filière (3) obturable, tout d'abord mise en pression au moyen d'un piston de presse (4) alors que la filière est obturée, puis expulsée du cylindre de presse (1) au moyen de ce piston et alors que la filière est ouverte, caractérisé par le fait qu'on exerce une contre-pression antagoniste à la pression de la presse sur le boudin extrudé de pâte de carbone (8) qui sort de la filière.
2. Procédé selon la revendication 1, caractérisé par le fait qu'on fait croître la contre-pression avec l'accroissement de la longueur du boudin extrudé (8).
3. Dispositif pour la mise en oeuvre du procédé selon la revendication 1 ou 2, composé d'un cylindre de presse (1 ) qui renferme un piston de presse (4) et qui présente une filière obturable (3), et d'un manchon de guidage destiné à guider le boudin extrudé (8) sortant de la filière, caractérisé par le fait que le manchon de guidage est constitué par un cylindre de pression (5), dans lequel est guidé un piston de pression (6), et qui est mobile en translation axiale et peut être raccordé à joint étanche à la filière (3) du cylindre (1) de la presse.
4. Dispositif selon la revendication 3, caractérisé par le fait que la paroi latérale du cylindre de pression (5) présente des orifices de lubrification (9) qui sont raccordés à au moins une conduite de pression (10) servant à acheminer un lubrifiant.
5. Dispositif selon la revendication 3 ou 4, caractérisé par le fait que, dans la paroi latérale du cylindre de pression (5), est guidé, mobile en translation axiale, un support d'appui (13) destiné à soutenir le boudin extrudé (8) et qui constitue une partie de la paroi intérieure.
EP19850890266 1985-01-04 1985-10-24 Procédé et dispositif pour extruder des masses de carbone, en particulier des électrodes de carbone Expired EP0216978B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0001785A AT382897B (de) 1985-01-04 1985-01-04 Verfahren und vorrichtung zum strangpressen von kohlenstoffmassen, insbesondere von kohlenstoffelektroden
AT17/85 1985-01-04

Publications (2)

Publication Number Publication Date
EP0216978A1 EP0216978A1 (fr) 1987-04-08
EP0216978B1 true EP0216978B1 (fr) 1988-06-01

Family

ID=3479321

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850890266 Expired EP0216978B1 (fr) 1985-01-04 1985-10-24 Procédé et dispositif pour extruder des masses de carbone, en particulier des électrodes de carbone

Country Status (4)

Country Link
EP (1) EP0216978B1 (fr)
AT (1) AT382897B (fr)
DD (1) DD240702A5 (fr)
DE (1) DE3562998D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103737954A (zh) * 2013-12-31 2014-04-23 一重集团大连设计研究院有限公司 一种旋转碳素电极挤压机及其挤压方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10000165A1 (de) * 2000-01-05 2001-07-12 Sgl Technik Gmbh Verfahren und Vorrichtung zur Herstellung von Bauteilen und Halbzeugen aus synthetischem Graphit oder keramischem Granulat, insbesondere zur Herstellung von Graphitrohren
CN108749100A (zh) * 2018-06-06 2018-11-06 河南中烟工业有限责任公司 一种压棒机挤出成型棒头

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1881397A (en) * 1930-05-31 1932-10-04 Potlatch Forests Inc Briquetting machine
US4307052A (en) * 1978-07-17 1981-12-22 Ashland Oil, Inc. Process for carbon electrode manufacture
DE2853748C2 (de) * 1978-12-13 1981-02-19 Mannesmann Demag Ag, 4100 Duisburg Vorrichtung zum Verschließen der Austrittsöffnung einer Elektrodenpresse
DE2855899C2 (de) * 1978-12-23 1983-11-10 Mannesmann AG, 4000 Düsseldorf Aufnahmevorrichtung für einen Kohle- Elektrodenstrang

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103737954A (zh) * 2013-12-31 2014-04-23 一重集团大连设计研究院有限公司 一种旋转碳素电极挤压机及其挤压方法

Also Published As

Publication number Publication date
ATA1785A (de) 1986-09-15
DE3562998D1 (en) 1988-07-07
EP0216978A1 (fr) 1987-04-08
AT382897B (de) 1987-04-27
DD240702A5 (de) 1986-11-12

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