WO2004076087A1 - Appareil d'extrusion en continu - Google Patents

Appareil d'extrusion en continu Download PDF

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Publication number
WO2004076087A1
WO2004076087A1 PCT/GB2004/000733 GB2004000733W WO2004076087A1 WO 2004076087 A1 WO2004076087 A1 WO 2004076087A1 GB 2004000733 W GB2004000733 W GB 2004000733W WO 2004076087 A1 WO2004076087 A1 WO 2004076087A1
Authority
WO
WIPO (PCT)
Prior art keywords
coining roll
circumferential groove
rotatable wheel
extrusion apparatus
continuous extrusion
Prior art date
Application number
PCT/GB2004/000733
Other languages
English (en)
Inventor
Daniel John Hawkes
Original Assignee
Bwe Limited
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 Bwe Limited filed Critical Bwe Limited
Publication of WO2004076087A1 publication Critical patent/WO2004076087A1/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
    • B21C33/00—Feeding extrusion presses with metal to be extruded ; Loading the dummy block
    • 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
    • B21C23/005—Continuous extrusion starting from solid state material

Definitions

  • This invention relates to continuous extrusion apparatus for the forming of metals by a continuous extrusion process in which feedstock is introduced into one or more circumferential grooves in a rotating wheel to pass into a corresponding passageway or corresponding passageways formed between the or each groove and arcuate tooling extending into the or each groove.
  • GB 2 083 770A discloses continuous extrusion apparatus for the production of elongate extrudate including a rotatable wheel formed with a circumferential groove, shoe means including arcuate tooling bounding a radially outer portion of the circumferential groove provided with an exit aperture in a die top and an abutment displaced in the direction of rotation from the exit aperture, means arranged to deliver feedstock to the circumferential groove and a coining roll projecting into the circumferential groove rotatable on an axis parallel to the rotatable wheei axis.
  • the feedstock is in the form of continuous rod and means are provided arranged continuously to adjust the depth of projection of the coining roil into the circumferential groove in accord with signals generated indicative of radial spacing existing intermediate the coining roll and the rotatable wheel relative to a predetermined, requisite, spacing.
  • Figure 1 is a cross-sectional side elevation of a portion of continuous extrusion apparatus including a rotatable wheel and a coining roll mounting;
  • FIG 2 is a cross-sectional side elevation of a portion of an alternative arrangement of the coining roll m ounting.
  • a portion of a rotatable wheel 2 formed with a circumferential groove 4 and a portion of a shoe insert 6 associated with the rotatable wheel 2.
  • a coining roll 8 freely rotating on a shaft 10 extending parallel to the wheel axis is mounted in a stirrup 11 carried on a stirrup block 12 adjustably mounted on a fixed support frame 14.
  • the stirrup block 12 is formed with a rectangular aperture 16 accommodating a rectangular housing 18 dimensioned to be a sliding fit between upper and lower faces 20,22 extending in planes perpendicular to the axial plane through central axes of the rotatable wheel 2 and the coining roll 8 and a loose fit between side faces 24,26 extending in planes parallel to the said axial plane of the rectangular aperture 16.
  • the rectangular housing 18 is formed with a slightly eccentric cylindrical bore 28 provided with an eccentric shaft 30 mounted in the fixed support frame 14.
  • Rotation of the shaft 30 causes, by virtue of the eccentricity, movement of the rectangular housing 18.
  • a lateral component of the movement is accommodated by virtue of the loose fit between the side faces 24, 26 of the rectangular aperture 16 whilst a vertical component of the movement translates into a vertical movement of the stirrup block 12 relative to the fixed support frame 14, thereby urging the coining roll 8 toward, or retracting the coining roll from, the circumferential groove 4.
  • the shaft 30 is rotated through a restricted angle by means of an electric or hydraulic motor (not shown) driven through gearing in accord with a signal indicative of radial spacing existing intermediate the coining roll 8 and the rotatable wheel 2 relative to a pre-determined requisite spacing.
  • the signal indicative of radial spacing existing intermediate the coining roll 8 and the rotatable wheel 2 is derived from a signal indicative of angular rotation of the eccentric shaft 30.
  • a signal indicative of the requisite spacing to produce optimum extrusion conditions is derived from an output signal from thermo-couple means (not shown) mounted on the rotatable wheel 2 producing a signal indicative of the temperature of the rotatable wheel 2.
  • the signal indicative of the requisite spacing to produce optimum extrusion conditions is derived from an output signal from a load cell (not shown) positioned on the fixed support frame 14 producing a signal indicative of the radial force imposed by the coining roll 8 on the feedstock 32.
  • stirrup block 12 Since the stirrup block 12 has a limited vertical travel of approximately two millimetres, means (not shown) are provided to enable the coining roll 8 to be positioned projecting into the circumferential groove 4 to contact the feedstock 32 prior to commencing extrusion.
  • Feedstock 32 in the form of a continuous rod is fed to enter the circumferential groove 4 in the rotatable wheel 2 in a tangential direction and is urged into contact with the base and walls of the
  • the coining roll 8 may be of 05 sufficient axial width to extend across all of the circumferential grooves.
  • individual coining roils registering with respective circumferential grooves may be provided.
  • the stirrup 11 is 10 carried on a stirrup block 34 formed with a circular aperture 36 accommodating a double eccentric sleeve 38 and a corresponding eccentrically mounted central shaft 40. Contra-rotation in unison of the double eccentric sleeve 38 and central shaft 40 through 115 a restricted angle urges the coining roll 8 toward, or retracts the coining roll 8 from, the circumferential groove 4.
  • the contra-rotational movements are effected by means of an electric or hydraulic motor (not shown) driven through gearing to the respective double eccentric sleeve 38 120 and the central shaft 40 in accord with a signal indicative of the depth of projection of the coining roll 8 into the circumferential groove 4 relative to a pre-determ ined requisite depth of projection as described in conjunction with Figure 1.
  • the movement required of the coining roll 8 relative to the 125 rotatable wheel 2 will be less than two millimetres but the loading applied through the coining roll 8 to the feedstock 32 will be in the range of between two and ten tonnes.
  • Alternative arrangements for effecting the requisite limited movement of the coining roll 8 relative to the rotatable wheel 2 may be envisaged provided that they are sufficiently robust to effect the movement within the range of loads.
  • the coining roll has a diameter of approximately one third of the diameter of the rotatable wheel 2, thereby permitting the positioning of the coining roll 8 in close proximity to the shoe insert 6 and optimising the radial loading.
  • the arrangement described in GB 2 083 770A relates to continuous extrusion apparatus in which the feed is in the form of loose material.
  • a driven coining roll of similar diameter to the diameter of the rotatable wheel is mounted on the shoe and is driven to compact the loose material into a strip of feed material prior to entry into a passageway formed between the sides and floor of the circumferential groove and the
  • the strip By virtue of being driven forward tangentially of the rotatable wheel by the driven coining roll the strip is driven into close engagement with the sides and floor of the groove following entry into the passageway. Whilst the coining roll is said to be adjustably mounted on the body of the shoe, no details of any adjustment mechanism are disclosed.
  • the present invention is directed toward a different problem than that described in GB 150 2 083 770A.
  • extrudate for example, copper tube
  • One of the parameters is the close cohesion between the feed material and the walls of the circumferential groove in proximity to the shoe which, in turn, affects the forces acting on the feed material and thus the temperature, arising 155 during the extrusion process.
  • the feedstock conventionally is in the form of spools of copper rod having a relatively wide dimensional tolerance, typically plus or minus 0.4 millimetre on, for example, fifteen millimetre diameter rod.
  • the rod is

Landscapes

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

Abstract

L'invention porte sur un appareil d'extrusion en continu de tubes de cuivres extrudés à partir d'une barre de cuivre (32) fournie en continu. A cet effet on utilise un rouleau écraseur (8) ajustable en continu monté de manière à pénétrer dans la gorge périphérique (4) d'une roue tournante (2) et appliquant une force radiale pouvant atteindre 10 tonnes sur la barre (32) de cuivre pour l'appliquer uniformément contre la gorge (4) avant l'opération d'extrusion. Le rouleau écraseur (8) est monté tournant librement sur un étrier (11) solidaire d'un bloc support (12), lui même monté coulissant sur un cadre support (14). La rotation limitée angulairement d'un axe (30) monté sur un excentrique et coopérant avec un logement (18), permet de placer le rouleau écraseur (8) dans la gorge (4) ou de l'en retirer. L'arbre (30) est entraîné par un moteur (non représenté) activé par des signaux, indiquant une déviation par rapport à l'application d'une force radiale requise prédéterminée, et fonction de la position du rouleau écraseur (8), de la température de la roue (2) et de la force appliquée sur le rouleau (8).
PCT/GB2004/000733 2003-02-28 2004-02-26 Appareil d'extrusion en continu WO2004076087A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0304566.3 2003-02-28
GB0304566A GB0304566D0 (en) 2003-02-28 2003-02-28 Continuous extrusion apparatus

Publications (1)

Publication Number Publication Date
WO2004076087A1 true WO2004076087A1 (fr) 2004-09-10

Family

ID=9953818

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2004/000733 WO2004076087A1 (fr) 2003-02-28 2004-02-26 Appareil d'extrusion en continu

Country Status (2)

Country Link
GB (1) GB0304566D0 (fr)
WO (1) WO2004076087A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103504733A (zh) * 2012-06-26 2014-01-15 （沈阳）中国印钞造币总公司沈阳造币技术研究所 一种硬币、纪念章边部凹槽滚异形的制造方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101253A (en) * 1972-11-15 1978-07-18 United Kingdom Atomic Energy Authority Extrusion
GB2083770A (en) * 1980-09-16 1982-03-31 Atomic Energy Authority Uk Extrusion apparatus
GB2149714A (en) * 1983-11-07 1985-06-19 Metrode Products Limited Extrusion process
US4953382A (en) * 1989-12-08 1990-09-04 Olin Corporation Extrusion of strip material
US5167138A (en) * 1987-12-31 1992-12-01 Southwire Company Conform extrusion process and apparatus
WO1995007777A1 (fr) * 1993-09-15 1995-03-23 Abb Power T & D Company Inc. Production d'une bande de metal continue, avec systeme d'alignement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101253A (en) * 1972-11-15 1978-07-18 United Kingdom Atomic Energy Authority Extrusion
GB2083770A (en) * 1980-09-16 1982-03-31 Atomic Energy Authority Uk Extrusion apparatus
GB2149714A (en) * 1983-11-07 1985-06-19 Metrode Products Limited Extrusion process
US5167138A (en) * 1987-12-31 1992-12-01 Southwire Company Conform extrusion process and apparatus
US4953382A (en) * 1989-12-08 1990-09-04 Olin Corporation Extrusion of strip material
WO1995007777A1 (fr) * 1993-09-15 1995-03-23 Abb Power T & D Company Inc. Production d'une bande de metal continue, avec systeme d'alignement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103504733A (zh) * 2012-06-26 2014-01-15 （沈阳）中国印钞造币总公司沈阳造币技术研究所 一种硬币、纪念章边部凹槽滚异形的制造方法
CN103504733B (zh) * 2012-06-26 2016-03-30 （沈阳）中国印钞造币总公司沈阳造币技术研究所 一种硬币、纪念章边部凹槽滚异形的制造方法

Also Published As

Publication number Publication date
GB0304566D0 (en) 2003-04-02

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