WO2009155949A1 - Extrusion de métal d'un produit comprenant des pièces conçues pour être séparées l'une de l'autre après extrusion - Google Patents

Extrusion de métal d'un produit comprenant des pièces conçues pour être séparées l'une de l'autre après extrusion Download PDF

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Publication number
WO2009155949A1
WO2009155949A1 PCT/EP2008/005224 EP2008005224W WO2009155949A1 WO 2009155949 A1 WO2009155949 A1 WO 2009155949A1 EP 2008005224 W EP2008005224 W EP 2008005224W WO 2009155949 A1 WO2009155949 A1 WO 2009155949A1
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WO
WIPO (PCT)
Prior art keywords
groove
product
extrusion
parts
less
Prior art date
Application number
PCT/EP2008/005224
Other languages
English (en)
Inventor
Anders Persson
Derek Russell
Original Assignee
H. Folke Sandelin Ab
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 H. Folke Sandelin Ab filed Critical H. Folke Sandelin Ab
Priority to PCT/EP2008/005224 priority Critical patent/WO2009155949A1/fr
Publication of WO2009155949A1 publication Critical patent/WO2009155949A1/fr

Links

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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/06—Making sheets
    • 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
    • B21C23/08—Making wire, bars, tubes
    • 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
    • B21C35/00—Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels
    • B21C35/02—Removing or drawing-off work
    • B21C35/023—Work treatment directly following extrusion, e.g. further deformation or surface treatment
    • B21C35/026—Removing sections from the extruded work, e.g. removing a strip to create an open profile

Definitions

  • the present disclosure relates to metal extrusion, more specifically it relates to extrusion of metal into a product, such as a strip, comprising parts designed to be post-extrusion disconnected from each other.
  • a conventional HANSSON-ROBERTSON® machine comprises i.a. a motor driven extrusion screw in a housing, a die block, temperature control means, a melting pot and a feed pipe.
  • the extrusion screw is driven to rotate inside the screw housing.
  • the screw is rotatably supported in a bearing housing and extends from the bearing housing towards the die block.
  • Melted metal is arranged to be fed, via the feed pipe, into the screw housing to fill spaces between the outer surface of the screw and the inner surfaces of the screw housing.
  • the temperature control means enables control of the temperature of the metal in the screw housing, i.a.
  • the die block comprises means for turning the flow of the metal, typically plastic lead, 90-degrees, so that the flow direction becomes substantially perpendicular to the axial (metal transport or extrusion) direction of the screw, thereby enabling forming the cable sheath onto a cable being transported in the perpendicular direction through the die block.
  • US 6,797,403 discloses production of a lead alloy strip for fabrication of battery electrodes, using a HANSSON-ROBERTSON® extruder instead of more conventional strip production methods such as ram-press extrusion.
  • An advantage of the HANSSON-ROBERTSON® extruder is that it allows for good control of the process through i.a. machine parameter adjustments, which in turn allows for extrusion products having a desired microstructure and a strip with very accurate physical dimensions can be produced.
  • a conventional extruder with die block as above for cable sheath production was modified to allow for strip production of planar high-quality lead alloy strip of desired profile.
  • the extruded strip can be produced with strip thickness tolerances of ⁇ 0.025 mm and thus an exact width required can be produced without trimming edges that risk to negatively affect properties near the edges.
  • the modified system in US 6,797,403 includes a cooling system for rapidly cooling the strip under controlled conditions.
  • the cooled extrusion strip is slit and expanded into a diamond grid mesh.
  • a metal extruder is comparatively expensive and typically a very big investment. Owing to this, such equipment is often operated in production over as long time periods as possible to achieve high throughput and high degree of utilization of the extruder.
  • Parallel production of extruded products using a single extruder is an interesting option instead of duplicating the extruder.
  • the difficulty to accomplish multiple product from a single extruding machine may vary depending on the desired profile of the extruded product. Also, in practice it is typically required to extrude a product as a single piece.
  • post extrusion separation e.g. by cutting, has tendency to negatively affect properties near edges of separation and thus it can be hard to reach the same quality degree as when producing a single piece product.
  • a general object of the invention is thus to present a solution that enables increased throughput of continuous metal extrusion products.
  • a more specific object is to present a solution where products can be extruded in parallel in one piece using a single continuous extruder and which piece can be post extrusion separated into the products with no, or at least with low, negative impact on quality compared to a case where only one product is extruded at the same time.
  • a device for use in a metal extruder comprising a die block adapted for extrusion of metal into a product, such as a strip, said product comprising parts designed to be post- extrusion disconnected from each other.
  • Said device further comprises a groove former arranged to form a longitudinal first groove between said parts.
  • a method for producing a metal product comprising parts designed to be post- extrusion disconnected from each other, said method comprising feeding metal to a die block of a metal extruder; extruding metal through said die block to form said product; and forming a longitudinal first groove between said parts.
  • an extruded metal product such as a strip, comprising parts designed to be post-extrusion disconnected from each other, where said product has a longitudinal first groove separating said parts.
  • the groove between parts is meant that the groove as such does not belong to any of said parts.
  • longitudinal is here meant along the extrusion output direction.
  • the first groove facilitates post-extrusion disconnection of said parts along said first groove, such as by tearing along the first groove, with less detrimental material impact compared to a case without such groove.
  • the first groove thus enables that better quality parts can be extruded in parallel using a single metal extruder, which e.g. improves throughput and can reduce production costs.
  • the groove former may be arranged to form said groove at a location in relation to said die block where said product has not yet been cooled down to room temperature after extrusion.
  • forming of the groove may take part before said product has been cooled down to room temperature, and for the product, the first groove may have been formed in said product before said product was cooled down to room temperature after extrusion.
  • the forming of the first groove at such point allows for reduced deformation of edges when the parts are being post- extrusion separated. This is owing to that a groove, before the material has cooled down, can be made with less microscopic level impact on the material in and near the groove. The material will be more uniform in and near the groove compared to a case where the groove is being made after the material has cooled down.
  • the groove former may comprise a local narrowing of a die aperture of said die block, said narrowing having a profile corresponding to a profile of said first groove.
  • the first groove can thus be formed during the extrusion by said narrowing.
  • Forming the groove like this is a comparatively simple solution that do not require additional parts and the grove is formed as early as is possible and can thereby be made with very low microscopic level impact on the material in and near the groove. (Making the groove before extrusion is typically not possible because of the material deformation taking part during the extrusion.) Low microscopic level impact may be particularly advantageous for electrical appliances, such as when the product is a strip for use as an electrode in a battery.
  • the first groove may be tapered with a tapering depth and a narrow, preferably acute, bottom.
  • the tapered first groove opens up at an angle that is in the range of about 60° to about 120°.
  • the first groove may have a substantially triangular cross section.
  • the bottom may have an end with a radius that is less than about 1 mm, or less than about 0.5 mm, or less than about 0.1 mm, or less than about 0.05 mm, or less than about 0.01 mm.
  • the product typically has, along the bottom of the first groove, a thickness that is less than about 50% of the thickness of said product adjacent to and longitudinally along said first groove.
  • a maximum lateral width of the first groove is significantly less, such as less than about 5%, or less than about 4%, or less than about 3%, or less than about 2%, or less than about 1 %, of a largest lateral extension of said product.
  • the lateral extension is the width of the strip.
  • the lateral extension is the perimeter.
  • Said device may further comprise a second groove former arranged to form a second groove, said method may comprise a step for forming such groove and the product may comprise such second groove.
  • the second groove may have a substantially identical profile as the first groove and is preferably oppositely arranged the first groove on an opposite side of said product.
  • Such second groove facilitates post-extrusion disconnection by tearing, allow each groove to be smaller and enables parts that after disconnection are more symmetric and identical, or at least are more similar, on both sides.
  • Fig 1. shows a perspective view of an exemplary horizontally oriented HANSSON-ROBERTSON® type of continuous metal extruder having a die block adapted for extrusion into cable sheath.
  • Fig. 2a shows a schematic die aperture profile of a metal extruder die block for extrusion into a strip for post extrusion separation along a groove into two flat strips.
  • Fig. 2b shows a schematic strip extrusion product for post extrusion separation along a groove into two flat strips.
  • Fig. 3 is a flow chart that shows steps in a method according to an embodiment.
  • Fig 1. shows a perspective view of an exemplary horizontally oriented
  • HANSSON-ROBERTSON® type of continuous metal extruder as discussed in the background, comprising a die block 17 adapted for extrusion of cable sheath.
  • the shown extruder comprises a base frame 1 and a an extension frame 3 acting as floor support and means for bringing the parts of the extruder together.
  • a threaded extrusion screw (not shown in Fig. 1) is located in a screw housing 15, and is therein arranged to transport melted metal to the die block 17.
  • the shown extruder has a screw that is arranged to transport the metal for extrusion horizontally (in the x-direction indicated in Fig. 1), instead of vertically, which often is the case in more conventional extruders.
  • Such metal extruders can also be used with the present invention.
  • the die block is typically replaceable so that the extruder can be used to produce extrusion products of different profile.
  • a conventional extruder with die block as above for cable sheath production was modified to allow for strip production.
  • the extrusion may be performed in a direction that is parallel with the transport direction of the screw, since turning the flow perpendicularly as is the case for the cable sheath die block shown in Fig.
  • An extrusion product being a tube such as is the case for the die block in the shown example, is one example of a product that is compatible with the present invention.
  • Another example is a strip, for example as disclosed in US 6,797,403, which will be used next in a more detailed example.
  • Fig. 2a shows a schematic die aperture profile 22 for extrusion into a product being a strip 30, shown in Fig. 2b, that is designed to be post extrusion separated into two individual flat sub-strips, i.e. sub-products.
  • the sub-strips are thus connected parts 34a, 34b, or portions, of the strip 30.
  • the parts 34a, 34b are separated by two oppositely arranged longitudinal grooves 32a, 32b.
  • the disconnection of the parts 32a, 32b is taking part along the grooves 32a, 32b.
  • the grooves are preferably designed to facilitate disconnecting the sub-strip parts 34a, 34b from each other by tearing along said grooves.
  • the groves 34a, 34b are designed with a triangular cross section having a narrow acute bottom.
  • each of the parts 34a, 34b may be formed such that, after being post-extrusion disconnected from each other, each corresponds to the strip as disclosed in US 6,797,403.
  • the narrow bottom opens up at an angle ⁇ , which preferably is between about 60° and about 120°.
  • the shown strip product 30 has a thickness T adjacent to and longitudinally along the grooves 32a, 32b. At the bottom of each the groove the product has a thickness t, which preferably is less than about 50% of the thickness T of said product.
  • a thinner product in the groove means that disconnecting the parts will be easier, but this also increase the risk for the parts to come apart, fully or partially along the groove or groove, when it is not intended, e.g.
  • the width w of the groove in case of the triangular cross section can be defined as a function of the angle ⁇ of the groove and the depth, i.e. here (T-t)/2, of the groove.
  • w (T-t)sin( ⁇ 12)
  • w 2(T-t)sin( ⁇ 12).
  • T is typically in the range of 0.3-1.2 mm and t is typically in the range of 0.2-0.4 mm.
  • ⁇ is typically in the range of 0.05-0.4 mm.
  • the width w of each groove should be in the range 0.09-0.7 mm.
  • each such sub-strip typically is in the order of 100 mm, and a groove separate two sub- strip parts, it can be understood that the width w of the grooves, or groove, in a general case, should be significantly less than the width W, or lateral extension, of the extruded product, such that less than about one or a few percent thereof.
  • sub-products such as sub-strips from the parts 34a, 34b in Fig.
  • any such groove should be formed during the extrusion, or as soon as possible thereafter, and at least before the product has cooled down to room temperature. It should be understood that one way to accomplish this is to form the groove, or grooves, by a suitably shaped die block comprising a die aperture having a local narrowing, e.g. accomplished by a protrusion or protrusions from a wall of the die aperture, having a shape that corresponds to the shape of the desired groove, as for example is the case in Fig. 2a.
  • Low microscopic level impact e.g.
  • a controlled micostructure can be maintained, which may be desirable in particular for electrical appliances, i.e. when the sub-products are electrical components or for electrical or electrochemical use, such as when the sub-products are strips for use as battery electrodes as in US 6,797,403.
  • the shown grooves 32a, 32b separate the strip 30 into two substantially identical parts so that each of the sub-strips, after separation, will be substantially identical.
  • the parts 34a, 34b and grooves 32a, 32b are symmetrically arranged, however, generally symmetrical and/or asymmetrical parts and/or grooves are possible, e.g. so that the parts being separated by grooves may have different dimensions. It should be understood that other extruded products than a strip 30, i.e.
  • a tube such as corresponding to a cable sheath may be produced with a groove, or grooves longitudinally along the sheath, which allow for the tube to be longitudinally opened up and flatten after extrusion, or allow for a portion of the perimeter of the tube to be removed.
  • the groove or grooves may be formed so as to allow disconnecting of the parts by hand tearing, i.e. so that the extruded product is suitable to be disconnected into sub-products by tearing said parts apart along the groove by hand.
  • the extruded product may be a thin-walled product, or a product comprising a thin-wall structure, with the groove, or grooves, being formed in such wall of the product.
  • the groove can also be formed by other means and at other locations in an extruder. It is understood that the groove should not be formed before extrusion since the groove would then be deformed.
  • a groove can be formed by temporal such contact, e.g. such that only parts of the extruded product will be furnished with a groove.
  • mechanical contact for forming the grove also after the product has been extruded and passed through the die aperture.
  • An alternative to mechanical contact for forming the groove can e.g. be by cutting using a laser.
  • a protrusion from a die wall into the die aperture such as shown in the figure, may be an integral part of the die block or may be a separate part, e.g. releasably attached.
  • Any device arranged to form the groove may be fixed in relation to the die block or be movably arranged, e.g. such that it is possible to control if and when said device shall be in position to form the groove, and/or by that said device comprises a part arranged to move in relation to the die block when forming the groove.
  • the invention may advantageously be practiced to produce parallel lead alloy strips, which after post-extrusion separation, each may correspond to the type of strip described in US 6,797,403.
  • the groove should be formed in the product when the product is located in the die block or between the die block and the location of cooling.
  • Fig. 3 shows a flow chart for illustrating a method according to an embodiment, which is compatible with the foregoing.
  • metal typically in a plastic state
  • the metal is, in a second step 103, being extruded, typically under very high pressure, through a die aperture of the die block, whereby an extruded product is formed.
  • a third step 105 a longitudinal first groove is being formed between parts of the product to be post extrusion disconnected from each other. The groove is here being formed before the extruded product has been cooled down to room temperature.
  • the third step 105 is preferably taking part at the same time as the second step, i.e. the groove being formed during the extrusion.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)

Abstract

Dispositif à utiliser dans une extrudeuse de métal, comprenant un bloc de matrice (17) conçu pour l'extrusion de métal sous forme d'un produit (30), comme une bande, ledit produit (30) comprenant des pièces (34a, 34b) conçues pour être séparées l'une de l'autre après extrusion. Ledit dispositif comprend en outre un système de formation de rainure (24a), disposé de façon à former une première rainure longitudinale (32a) entre lesdites pièces (34a, 34b). L'invention concerne également ce produit extrudé et un procédé pour le produire. La première rainure facilite la séparation après l'extrusion desdites pièces le long de la rainure, comme par un déchirement le long de la rainure, avec moins d'impact matériel dommageable par rapport à un cas sans cette rainure. Si les pièces séparées sont des sous-produits autonomes, la rainure permet donc d'extruder en parallèle des pièces de meilleure qualité à l'aide d'une extrudeuse de métal unique, ce qui, par exemple, améliore le rendement et peut réduire les coûts de production.
PCT/EP2008/005224 2008-06-26 2008-06-26 Extrusion de métal d'un produit comprenant des pièces conçues pour être séparées l'une de l'autre après extrusion WO2009155949A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/005224 WO2009155949A1 (fr) 2008-06-26 2008-06-26 Extrusion de métal d'un produit comprenant des pièces conçues pour être séparées l'une de l'autre après extrusion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/005224 WO2009155949A1 (fr) 2008-06-26 2008-06-26 Extrusion de métal d'un produit comprenant des pièces conçues pour être séparées l'une de l'autre après extrusion

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WO2009155949A1 true WO2009155949A1 (fr) 2009-12-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPV20110011A1 (it) * 2011-05-25 2012-11-26 Alessandro Mantovani Processo di taglio ed ablazione per produzione di griglie in piombo per accumulatori mediante utilizzo di fascio laser

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2940561A1 (de) * 1979-10-06 1981-04-16 Peerless Of America Inc., Chicago, Ill. Verfahren zur herstellung von an ihrer aussenseite verformten prismen oder achsparallelen prismengruppen, insbesondere von heizkoerpern mit waermeaustauschflaechen sowie raumformen von prismengruppen zur ausuebung des verfahrens
EP0667110A1 (fr) * 1993-12-16 1995-08-16 Julius & August Erbslöh GmbH & Co. Profilé pour la construction de cadres
US20020157743A1 (en) * 2001-02-26 2002-10-31 Clark Douglas G. Continuous extruded lead alloy strip for battery electrodes
WO2004033122A1 (fr) * 2002-09-20 2004-04-22 Erbslöh Aluminium Gmbh Profile compose extrude et procede d'enroulement separe de deux tubes individuels simultanement extrudes a l'aide d'un dispositif d'enroulement
WO2006016128A1 (fr) * 2004-08-07 2006-02-16 Cambridge University Technical Services Limited Dispositif et méthode de production d’un film disposant d’une région guidant les coupures et film extrudé disposant d’une telle région avec coupure guidée

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2940561A1 (de) * 1979-10-06 1981-04-16 Peerless Of America Inc., Chicago, Ill. Verfahren zur herstellung von an ihrer aussenseite verformten prismen oder achsparallelen prismengruppen, insbesondere von heizkoerpern mit waermeaustauschflaechen sowie raumformen von prismengruppen zur ausuebung des verfahrens
EP0667110A1 (fr) * 1993-12-16 1995-08-16 Julius & August Erbslöh GmbH & Co. Profilé pour la construction de cadres
US20020157743A1 (en) * 2001-02-26 2002-10-31 Clark Douglas G. Continuous extruded lead alloy strip for battery electrodes
WO2004033122A1 (fr) * 2002-09-20 2004-04-22 Erbslöh Aluminium Gmbh Profile compose extrude et procede d'enroulement separe de deux tubes individuels simultanement extrudes a l'aide d'un dispositif d'enroulement
WO2006016128A1 (fr) * 2004-08-07 2006-02-16 Cambridge University Technical Services Limited Dispositif et méthode de production d’un film disposant d’une région guidant les coupures et film extrudé disposant d’une telle région avec coupure guidée

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPV20110011A1 (it) * 2011-05-25 2012-11-26 Alessandro Mantovani Processo di taglio ed ablazione per produzione di griglie in piombo per accumulatori mediante utilizzo di fascio laser
WO2012159759A1 (fr) 2011-05-25 2012-11-29 Riva, Giuseppe Procédé de fabrication de grilles de plomb pour électrodes de batteries
CN103732347A (zh) * 2011-05-25 2014-04-16 朱塞佩·里瓦 制造用于蓄电池电极的铅栅的方法

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