EP3389885B1 - Détection automatique d'unité formant matrice - Google Patents

Détection automatique d'unité formant matrice Download PDF

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Publication number
EP3389885B1
EP3389885B1 EP16831739.4A EP16831739A EP3389885B1 EP 3389885 B1 EP3389885 B1 EP 3389885B1 EP 16831739 A EP16831739 A EP 16831739A EP 3389885 B1 EP3389885 B1 EP 3389885B1
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EP
European Patent Office
Prior art keywords
shear
matrix
blade
press
distance
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.)
Not-in-force
Application number
EP16831739.4A
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German (de)
English (en)
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EP3389885A1 (fr
Inventor
Davide TURLA
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.)
Turla Srl
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Turla Srl
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Publication of EP3389885A1 publication Critical patent/EP3389885A1/fr
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Publication of EP3389885B1 publication Critical patent/EP3389885B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C35/00—Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels for metal extruding
    • B21C35/04—Cutting-off or removing waste
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS 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
    • B21C23/212—Details
    • B21C23/215—Devices for positioning or centering press components, e.g. die or container

Definitions

  • the present invention relates to a device for automatically detecting the size of a matrix stack on an extrusion press for aluminum or other metals.
  • part of a billet remains in contact with a press matrix and must be removed before starting a new extrusion process because any slag present in the slab may concentrate therein.
  • Removing the butt of the metal billet is fundamental to obtain always optimal extrusion products; the incomplete removal of the billet residues and/or an inaccurate cut on the matrix may cause problems during the next extrusion cycle.
  • Shears which are fitted directly on the press at the matrix, are used to solve this problem. At the end of each extrusion cycle, the shear removes the billet butt from the matrix.
  • Adjusting the distance between the shear blade and the matrix is thus fundamental.
  • the distance of the blade from the matrix is calibrated manually in occasion of stops for maintenance.
  • the distance between the blade and the matrix may vary as a consequence of thermal variations to the matrix itself or to different matrix lives; accurate adjustment, which may be performed multiple times during the extrusion process and which does not envisage the intervention of an operator is thus necessary.
  • US2014/0260488A1 on which the preamble of claim 1 is based, describes an automatic adjustment system of a shear on an extrusion press.
  • a shear blade is positioned at a safe distance from the matrix each time; such distance may vary after a matrix change which may imply fluctuations of the thickness of the matrix used.
  • This operation is carried out by letting the cutting guide, which rests on the matrix, slide when is hot; the distance between the shear blade and the matrix is adjusted by means of a shim positioned between the blade and the shear guide. This procedure makes it possible to adjust the distance without a direct intervention by the operator.
  • the structure of the cutting cylinder, to which the blade is connected envisages a pin at its upper end, which pin either permits or blocks the inclination of the blade.
  • the system envisages that the blade is inclined until it touches the matrix. After having removed the billet, the blade returns to the initial position over the matrix.
  • the cutting cylinder may associate different inclinations to adapt to the different matrixs and over time requires supplementary maintenance which must result in costs for personnel and machine downtime.
  • Another advantage is in that after having removed the billet butt, the shear returns to the initial position with a movement which is equal and contrary to the shearing position without moving away from the matrix. Any metal residues which may be deposited on the shear blade could come into contact with the matrix, thus damaging it.
  • WO2013/108222 describes a shear for removing the non-extruded material butt mounted over the extrusion matrix.
  • the shear is mounted on an axis orthogonal with respect to the extrusion axis.
  • the cut follows a preset horizontal axis on the cutting axis so as to remove the billet butt accurately and not to score the matrix.
  • the shear is made to slide within the guides so as to predetermine the exact cutting position. Once the ideal position for the cut has been chosen, the position is blocked and cannot be modified during the processing steps.
  • the shear of the present invention envisages a complex setting of the cutting position of the shear with personnel costs which can increase according to the extrusion process.
  • the shear After the cut, the shear returns to its initial position by sliding vertically near the extrusion matrix. Any remaining small metal parts of the shear could damage the matrix.
  • US2014/0250967 describes a cutting mechanism for removing the non-extruded billet part.
  • the system envisages that a shear is mounted over the extrusion matrix.
  • the shear moves vertically and horizontally with respect to the extrusion axis.
  • the distance between the matrix and the blade may be set to different preset values.
  • the distance between the shear blade and the matrix is preset to standard values not allowing an accurate cut of the material remaining on the matrix.
  • US4593552 describes a mechanism for removing the non-extruded portion of a billet.
  • a shear is mounted on the press so that it can move with respect to the extrusion plane so as to remove the billet portion from the matrix.
  • the shear blade is adjusted to remove the billet and pass near the matrix.
  • US8490453B2 describes a cutting mechanism for removing the non-extruded portion of a billet.
  • the shear is supported by a cylinder and a piston allows the movement of the shear in a guide.
  • Figure 1 shows the front of a press 1 comprising a shearing unit with a shear 2, an adjustment mechanism 3 of the shear 2, a matrix 11 and a reaction plate 10 of the press 1.
  • the press 1 of the present invention is a conventional press 1 comprising a punch adapted to press on a metal billet, preloaded on the press 1, to obtain extruded metal section bars following the passage inside the matrix 11.
  • the punch is operated by a hydraulic system, e.g. by means of cylinders, which are actuated, in turn, by a control fluid via a guiding circuit.
  • the control fluid is pushed within the guiding circuit by at least one pump, e.g. a piston or gear pump.
  • the shear 2 is mounted on the press 1 to separate the non-extruded end portion of the billet after extrusion.
  • the shear 2 is connected to the press 1 so that it can perform both horizontal and vertical movements. It is very important for both the vertical and horizontal movements of the shear 2 to be finely adjusted to prevent damaging the press 1, in particular the matrix 11.
  • the shear 2 comprises a slide blade holder 24 and a blade 21.
  • the metal material structure 20 connects the shear 2 to the press 1.
  • Said structure 20 has a triangular shape; one of the two three sides of the structures 20 is connected to the shear 2 and another side of the structure 20 is connected to the press 1.
  • Said structure 20 is adapted to slide within sliding guides of the press 1 allowing the shear 2 to move horizontally.
  • the shear 2 is fixed to the press 1 so that the blade 21 of the shear 2 is facing towards a lower portion of the press 1, slightly over the matrix 11.
  • the slide blade holder 24 is adapted to contain the blade 21 of the shear 2 and to slide within the guides 25 of the press 1. Said guides 25 extend longitudinally from the slide blade holder and allow a vertical sliding of the slide blade holder 24 and of the blade 21.
  • An actuator 22 for actuating the blade 21 is fixed over the shear 2 and controls the vertical movements thereof.
  • the actuator 22 maintains the shear in a distanced position from the matrix 11 during the extrusion process, while it allows the shear 2 to move and remove the bottom of the billet remained stuck to the matrix 11 at the end of the extrusion process.
  • the vertical sliding of the shear 2 is controlled by means of a hydraulic circuit, a control fluid maintains in under pressure the cylinders which control the movement of the shear 2 and the return of the shear 2 in distanced position from the matrix 11, such movements are controlled by means of the transducer 23.
  • the horizontal sliding of the shear 2 is possible by virtue of an adjustment mechanism 3 of the shear 2 and a removal actuator 36.
  • the adjustment mechanism 3 is adapted to adjust the distance of the blade 22 from the matrix 11, said adjustment is very important to prevent the blade 22 from damaging the matrix 11 and the adjustment is in the order tenths of a millimeter. Once the distance between the blade 22 and the matrix 11 has been adjusted, the distance is kept stable until the matrix 11 is changed.
  • the removal actuator 36 instead, it used to remove the blade 22 from the matrix 11 whenever the blade 22 has removed a billet part remained on the matrix 11.
  • the actuator 36 moves the blade 22 by a fixed distance which is not adjusted and which is in the order of centimeters.
  • the adjustment mechanism 3 of the position of the shear 2 is connected to the structure 20.
  • the adjustment mechanism comprises an electric motor 31, a worm screw 32, a nut screw 33, adjusting slide plates 34, and a cylinder lock 37.
  • the adjustment mechanism 3 is adapted to adjust the distance between the blade 21 of the shear 2 and the matrix 11 of the press 1. Said adjustment is carried out when an extrusion process has ended and/or it is necessary to change the matrix stack 11 of the press 1.
  • the electric motor 31, integral with the reaction plate 10 of the press 1 is adapted to actuate the rotation of the worm screw 32.
  • the nut screw 33 is integral with the structure 20 and at least one adjusting slide plate 34.
  • the slide plate 34 is adapted to slide along a guide 340.
  • the rotation of the electric motor 31 is adapted to turn the worm screw 32 and make the worm screw 33 slide with the adjusting slide plate 34; said sliding of the screw nut 33 is adapted to cause the horizontal movement of the shear 2.
  • the electric motor 31 is integral with the reaction plate 10 of the press 1 and remains static, while the adjusting slide plate 34, integral with the worm screw 33, is adapted to slide along the guide 340 following the rotation of the worm screw 32 actuated by the electric motor 31.
  • the removal actuator 36 comprises a rear attachment 360 integral with the adjusting slide plate 34, a cylinder 362 and a piston 361.
  • the piston 361 is adapted to slide within the cylinder 362; one end 363 of the piston 361 is integral with a plate 364 anchored to the shear-to-press connecting structure 20.
  • the sliding of the piston 361 within the cylinder 362 is adapted to cause the horizontal movement of the structure 20 and thus of the shear 2.
  • the piston 361 is pressurized, i.e. stopped with respect to the cylinder 362, so that the structure 20 can move only after the sliding of the adjustment plates 34 and not following the sliding of the piston 361 within the cylinder 362.
  • a cylinder lock 37 adapted to press the adjusting slide plate against the guide 340, thus locking its sliding, is positioned at the end of the adjusting slide plate 34.
  • the cylinder lock 37 is integral with the press 1 and a single-acting hydraulic cylinder with spring return. Once the distance between the shear 2 and the matrix 11 is adjusted, a hydraulic pressure is applied and the cylinder lock 37 moves downwards thus pressing the adjusting slide plate 34 against the slide 340 and locking its sliding.
  • the hydraulic fluid for feeding the cylinder lock 37 comes from a press pump 1, being said cylinder lock 37 integral with the reaction plate 10 of the press 1.
  • the press 1 is stopped and the matrix 11 must be replaced.
  • said matrix is blocked by means of specific cylinder locks.
  • the slide blade holder 25 and the blade 21 are taken to the matrix 11 by operating with the shearing actuator 22, the position of which is controlled by the linear transducer 23. Hydraulic pressure is removed from the cylinder lock 37, thus allowing the movement of the adjusting slide plate 34 by means of the electric motor 31, which is supplied again and by means of the worm screw 32 and the nut screw 33, moves the blade 21 to the matrix 11 until they come into contact ( Figure 3 ).
  • the sliding of the adjusting slide plate 34 causes the movement of the structure 20 because said structure 20 is connected to said adjusting slide plate 34 by means of the plate 364.
  • the distance between the blade 21 and the matrix 11 of the press 1 is reset in this manner.
  • the contact between the blade 21 and the matrix 11 is monitored by means of torque control of the electric motor 31.
  • the electric motor 31 is supplied again and, by means of the worm screw 32 and the nut screw 33, moves the sliding adjustment plate 34 so as to remove the blade 21 and the blade holder 24 from the matrix 11 (circle A in Figure 4 ).
  • the sense of rotation of the electric motor 31 is thus inverted to detach the blade 21 from the matrix 11 by a distance that varies from 0.5 to 3 tenths of a millimeter ( Figure 4 ).
  • a multiturn absolute encoder integrated in the electric motor 31 detects the measurement of the distance between the matrix 11 and the blade 21.
  • the absolute encoder makes it possible to always know the position of the adjusting slide plate 34 and, even if there is no electricity, no additional resetting will be needed when the electricity is re-established.
  • the cylinder lock 37 is made to descend on the adjustment plate 34, thus pressing it against the guide 340 and blocking the sliding thereof. In this manner, the shear is adjusted and blocked on the measurement of the matrix 11 loaded on the press 1. The cylinder lock 37 will thus remain blocked until a new measuring cycle of the matrix 11.
  • the press 1 makes it possible to load a new billet to be extruded.
  • the end part of the extruded billet 100 remain attached to the matrix 11 and must be removed by means of shearing.
  • the blade 21 of the shear 2 previously reset as described above, is in the starting position ( Figure 6 ).
  • the shearing actuator 22 is actuated and the blade 21 descends downwards removing the end part of the billet which was not extruded 100 ( Figure 7 ).
  • the auxiliary device makes it possible to detach any parts of the billet 100 which could remain stuck to the blade 21 of the shear 2.
  • the horizontal movement caused by the removal actuator 36 does not modify the preset distance between the blade 21 and the shear 2 because the adjusting slide plate remains always blocked by the cylinder lock 37.
  • the only movement which occurs is that of the removal actuator 36, which moves the structure 20 and thus causes the horizontal movement of the shear 2.
  • the shearing actuator is actuated again, the blade 21 moves up again to starting position ( Figure 10 ).
  • the removal actuator 36 fully extends, the piston 361 fully exits from the cylinder 362 and the blade 21 is at the predetermined distance from the matrix 11 again ( Figure 11).
  • the shear 2 may remove the billet with an accuracy necessary not to damage the matrix 11 and not to leave metal residues.
  • Another advantage is in the adjustment of the shear 2 which may be performed before the beginning of the extrusion cycle and allows the rapid adjustment of the distance of the blade 21 to the matrix 11.
  • Such contrivance makes it possible to adopt an electric motor of lower power and smaller size (being used only to move the mass of the shear off cycle), so as to provide more sensitivity during matrix stack detection by means of torque control.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • Shearing Machines (AREA)
  • Paper (AREA)
  • Control Of Exposure In Printing And Copying (AREA)

Claims (8)

  1. Unité de cisaillement pour presses à extrusion comprenant :
    - une cisaille (2) comprenant une lame (21) et un support de lame de coulissement (24), le support de lame de coulissement (24) étant approprié pour maintenir la lame (21) et pour coulisser verticalement à l'intérieur des guides (25) d'une structure de raccordement cisaille à presse (20) ;
    - un actionneur de cisaillement (22) approprié pour ajuster les mouvements verticaux de la cisaille (2) ;
    - un transducteur linéaire (23) approprié pour contrôler la position de l'actionneur de cisaillement (22) ;
    caractérisée en ce qu'elle comprend en outre un mécanisme d'ajustement (3) pour la cisaille (2), comprenant un moteur (31) approprié pour ajuster la distance entre la lame (21) et la matrice (11) de la presse (1) avant le début d'un procédé d'extrusion, un verrou de cylindre (37) pour bloquer ladite distance, et un actionneur de retrait (36) approprié pour éloigner la cisaille (2) d'une matrice (11) de la presse (1) après le cisaillement.
  2. Presse (1) pour l'extrusion de barres de section métalliques non ferreuses comprenant une matrice (11) et une unité de cisaillement selon la revendication 1.
  3. Presse (1) selon la revendication 2, caractérisée en ce que le mécanisme d'ajustement (3) pour la cisaille (2) comprend au moins une vis sans fin (32) raccordée au moteur (31), au moins une vis à écrou (33) et au moins une plaque de coulissement d'ajustement (34).
  4. Presse (1) selon les revendications 2 ou 3, caractérisée en ce que le mécanisme d'ajustement (3) pour la cisaille (2) est raccordé à la cisaille (2) au moyen de ladite structure de raccordement presse à cisaille (20).
  5. Presse (1) selon l'une des revendications 2 à 4, caractérisée en ce que le moteur (31) est un moteur électrique comprenant un encodeur approprié pour détecter la position de la lame (21).
  6. Procédé pour retirer une partie terminale d'une billette dans une presse à extrusion (1), caractérisé en ce que :
    - une première étape pour ajuster la distance entre une cisaille (2) et une matrice (11) comprend l'étape pour déplacer la cisaille (2) verticalement jusqu'à la hauteur de la matrice (11) de la presse (1),
    déplacer horizontalement la cisaille (2) jusqu'à ce qu'une lame (21) de la cisaille (2) vienne en contact avec la matrice (11) de la presse (1),
    retirer la lame (21) de la cisaille (2) de la matrice (11) de la presse (1) sur ladite distance,
    enregistrer la distance entre la lame (21) et la matrice (11) ; et
    - une seconde étape de cisaillement comprend l'étape pour déplacer verticalement la cisaille (2) pour le retrait de la partie terminale d'une billette extrudée,
    déplacer horizontalement la cisaille (2) au moyen d'un actionneur de retrait (36) pour éloigner la lame (21) de la cisaille (2),
    déplacer verticalement la cisaille (2) pour revenir à une position de départ,
    déplacer horizontalement la cisaille (2) pour revenir à la distance enregistrée entre la matrice (11) et la lame (21).
  7. Procédé selon la revendication 6, caractérisé en ce que l'ajustement de la distance entre la lame (21) de la cisaille (2) et la matrice (11) de la presse (1) comprend les étapes suivantes :
    actionner un moteur (31) solidaire avec une vis sans fin (32) raccordée à son tour avec une vis à écrou (33),
    déplacer horizontalement ladite vis à écrou (33) positionnée sur au moins une plaque de coulissement d'ajustement (34),
    déplacer horizontalement une structure (20) solidaire avec la cisaille (2) et la vis à écrou (33),
    bloquer ladite au moins une plaque de coulissement d'ajustement (34) avec un verrouillage de cylindre (37).
  8. Procédé selon la revendication 6, caractérisé en ce que la distance entre la lame (21) de la cisaille (2) et la matrice (11) est comprise entre 0,5 et 3 dixième de millimètre.
EP16831739.4A 2015-12-16 2016-12-15 Détection automatique d'unité formant matrice Not-in-force EP3389885B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUB2015A009680A ITUB20159680A1 (it) 2015-12-16 2015-12-16 Rilevamento automatico dimensione pacco matrice.
PCT/IB2016/057640 WO2017103828A1 (fr) 2015-12-16 2016-12-15 Détection automatique d'unité formant matrice

Publications (2)

Publication Number Publication Date
EP3389885A1 EP3389885A1 (fr) 2018-10-24
EP3389885B1 true EP3389885B1 (fr) 2019-10-02

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EP16831739.4A Not-in-force EP3389885B1 (fr) 2015-12-16 2016-12-15 Détection automatique d'unité formant matrice

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US (1) US20180369890A1 (fr)
EP (1) EP3389885B1 (fr)
IT (1) ITUB20159680A1 (fr)
WO (1) WO2017103828A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023104739A1 (de) 2022-11-14 2024-05-16 Sms Group Gmbh Pressrestschere sowie Verfahren zum Abscheren eines Pressrestes

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110216076A (zh) * 2019-06-27 2019-09-10 中信戴卡股份有限公司 一种在线加工区别标识装置
US20240157621A1 (en) * 2022-11-14 2024-05-16 Sms Group Gmbh Extrusion residue shears and method for shearing off an extrusion residue

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
US4593552A (en) * 1985-06-12 1986-06-10 Sutton Engineering Co. Butt shear with butt knocker
US8490453B2 (en) * 2009-04-15 2013-07-23 Ube Machinery Corporation, Ltd. Extrusion press
JP5780462B2 (ja) * 2011-10-25 2015-09-16 宇部興産機械株式会社 押出プレスのシャー装置
CN104023866A (zh) * 2011-11-07 2014-09-03 Sms米尔股份有限公司 带式及管式挤压机和用于分离挤压余料的方法
ITMI20120053A1 (it) * 2012-01-19 2013-07-20 Danieli Off Mecc Pressa di estrusione diretta per prodotti metallici

Non-Patent Citations (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023104739A1 (de) 2022-11-14 2024-05-16 Sms Group Gmbh Pressrestschere sowie Verfahren zum Abscheren eines Pressrestes

Also Published As

Publication number Publication date
ITUB20159680A1 (it) 2017-06-16
EP3389885A1 (fr) 2018-10-24
WO2017103828A1 (fr) 2017-06-22
US20180369890A1 (en) 2018-12-27

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