EP0210568A2 - Procédé d'extrusion, respectivement d'étirage - Google Patents

Procédé d'extrusion, respectivement d'étirage Download PDF

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Publication number
EP0210568A2
EP0210568A2 EP86109982A EP86109982A EP0210568A2 EP 0210568 A2 EP0210568 A2 EP 0210568A2 EP 86109982 A EP86109982 A EP 86109982A EP 86109982 A EP86109982 A EP 86109982A EP 0210568 A2 EP0210568 A2 EP 0210568A2
Authority
EP
European Patent Office
Prior art keywords
die
coolant
channel
extrusion
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.)
Granted
Application number
EP86109982A
Other languages
German (de)
English (en)
Other versions
EP0210568A3 (en
EP0210568B1 (fr
Inventor
Manfred Dr. Dipl.-Ing. Rossmann
Reinhard Dipl.-Ing. Strigl
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.)
Linde GmbH
Original Assignee
Linde GmbH
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 Linde GmbH filed Critical Linde GmbH
Priority to AT86109982T priority Critical patent/ATE102509T1/de
Publication of EP0210568A2 publication Critical patent/EP0210568A2/fr
Publication of EP0210568A3 publication Critical patent/EP0210568A3/de
Application granted granted Critical
Publication of EP0210568B1 publication Critical patent/EP0210568B1/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, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C29/00—Cooling or heating extruded work or parts of the extrusion press
    • 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
    • B21C23/009—Gas treatment of work
    • 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
    • B21C9/00—Cooling, heating or lubricating drawing material

Definitions

  • the invention relates to a method for extrusion or extrusion, in which material to be formed is pressed or drawn through a die and the resulting heat of removal is removed.
  • Extrusion is a forming process for the production of full and hollow strands with a wide variety of cross-sectional shapes that are constant over the length.
  • the starting form for metals is usually a cylindrical casting block or rolled rod section, which is displaced from the receiver of an extrusion press through a die opening that corresponds to the workpiece cross section.
  • the strand drawing is a forming process for the production of wire, tubes and profile bars from rolled solid and hollow strands. These are drawn on a continuous drawing machine through a stationary drawing die.
  • the manufacturing goal is a dimensionally accurate, smooth and thin-walled semi-finished product.
  • the invention is based on the object of specifying a method of the type mentioned at the outset with which the forming heat can be dissipated in an effective manner.
  • This object is achieved in that the material to be formed is cooled in the direction of movement in front of the die.
  • heat is withdrawn from the material to be formed at the point within an extrusion or extrusion system where most of the heat is generated, ie in the direction of movement of the material to be formed in front of the die.
  • the material to be formed is advantageously cooled by the material to be formed being cooled in an indirect heat exchange with a coolant. It has proven advantageous to additionally cool the die on the end face facing the material to be formed.
  • heating of the die is suppressed by cooling the material to be formed at the point at which most of the forming heat is generated.
  • the area of maximum heat development is shifted away from the die. This effect also causes the heat given off to the die to be reduced.
  • the process according to the invention achieves a better distribution of the forming heat that is produced.
  • the entire forming heat is dissipated comparatively quickly. Due to the optimal cooling effect at the point of maximum heat development, a higher pressing or drawing speed is possible. This can increase the performance of an extrusion or extrusion line.
  • an inert coolant is used, the coolant being brought into contact with the strand running out of the die after the heat exchange with the material to be formed. This procedure enables the outlet channel adjoining the die to be made inert, via which the pressed or drawn strand leaves the die.
  • a particularly intensive cooling and thus a particularly rapid dissipation of the forming heat is achieved in a preferred variant of the invention, if one as a coolant cryogenic gas, in particular a liquefied gas is used.
  • a coolant cryogenic gas in particular a liquefied gas is used.
  • Liquefied nitrogen has proven to be particularly useful as a coolant.
  • An essential part of an extrusion or extrusion system is the die through which the material to be formed is either pressed with the help of a punch or drawn with the help of a slide.
  • a coolant channel is arranged in front of the die with respect to the direction of movement of the material to be formed, a feed line and a discharge line opening into the coolant channel and the coolant channel having an opening coaxial to the die opening for the material to be formed with a larger cross-sectional area than that Encloses die opening area.
  • the material to be formed passes through the opening enclosed by the cooling duct according to the invention and is then pressed or pulled through the die, the opening of which determines the workpiece cross section.
  • the largest proportion of the forming heat is thus formed in the immediate vicinity of the coolant channel according to the invention and can be absorbed and carried away by the coolant flowing in the coolant channel.
  • the die is cooled on the one hand by indirect heat exchange with the coolant and on the other hand the distance between the end face facing the material to be formed and the area of maximum heat development compared to conventional ones Process enlarged. As a result, the heat input into the die is lower.
  • the design of a device according to the invention enables the coolant channel to be formed by a plate with a channel-like recess together with the end face of the die facing the material to be formed.
  • an inert coolant it has proven to be particularly advantageous if, after the indirect heat exchange with the material to be formed, the coolant is used for inerting the strand drain channel passing through the die and the associated pressure plate, through which the strand coming from the die passes Extrusion or extrusion device leaves.
  • the discharge line for the coolant is a tap hole which penetrates the pressure plate and opens into the strand outlet channel.
  • the discharge line for the coolant is connected to a line arranged outside the tool consisting of the pressure plate and die, which line in turn leads directly or via bores in the pressure plate into the strand drain channel.
  • a block 1 is to be formed into a workpiece strand 7 by extrusion.
  • the block 1 is placed in a sensor 10 with an inner sleeve 11 and pressed by means of a press disk 2 from a press ram 3 against a tool.
  • the tool essentially consists of a pressure plate 5 and a die 6.
  • the pressure plate 5 and die 6 are received by a tool holder 4.
  • Strand 7 leaves the die through a strand outlet channel 14 which leads through the die 6, the pressure plate 5 and the tool container 4.
  • a coolant channel 8, 9 is arranged in front of the die 6 in the direction of movement of the material to be formed.
  • the coolant channel 9 is formed by the end face of the die 6, designated by reference numeral 17, and a plate 8 with a channel-like recess.
  • the plate has an opening similar to the die opening (dimension 12) but larger (dimension 13).
  • the discharge line 16 for the coolant is a tap hole passing through the die 6.
  • the tap hole opens into an annular channel 18, which in turn is connected to the strand outlet channel 14 via holes 19.
  • Annular channel 18 and bores 19 schematically represent a cooling system that was conventionally used to dissipate the heat of deformation. This cooling system can continue to be used according to the invention and is now used, however, to conduct inert coolant which has been heated in the annular duct into the strand outlet duct 14.
  • the coolant channel 9 is arranged at the point in the extrusion press at which there is no cooling most of the forming heat would be formed in the central duct.
  • FIG. 2 shows the distribution of the temperature during adiabatic extrusion by means of isotherms 20.
  • This temperature distribution in front of the schematically represented die 6 with end face 17 occurs when no coolant channel 9 is arranged in front of the die.
  • the position of the coolant channel 9 according to the invention is indicated schematically in FIG. 2.
  • the area of maximum heat development is shifted away from the die.
  • the forming heat is dissipated directly at the point at which it is generated, so that the die is heated up much less than in conventional processes.
  • liquefied nitrogen is preferably used, which enables particularly intensive cooling.
  • Liquid nitrogen is introduced into channel 9 via feed line 15. There, the liquid nitrogen evaporates in indirect heat exchange with the material to be formed. The nitrogen evaporated by the heat of deformation flows through the discharge line 16, ring channel 18 and tap holes 19 into the strand outlet channel 14. Existing air is displaced there, so that an inert atmosphere prevails in the strand outlet channel.
  • the method according to the invention and the device according to the invention can be used for extrusion or extrusion of all metals and alloys.
  • the extrusion method according to the invention is preferably applied to the pressing of materials which are difficult to compress.
  • the method according to the invention achieves an optimal, intensive cooling effect due to the better distribution of the forming heat and the rapid dissipation of the forming heat.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Metal Extraction Processes (AREA)
EP86109982A 1985-08-02 1986-07-21 Procédé d'extrusion, respectivement d'étirage Expired - Lifetime EP0210568B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86109982T ATE102509T1 (de) 1985-08-02 1986-07-21 Verfahren zum strangpressen bzw. strangziehen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3527864 1985-08-02
DE19853527864 DE3527864A1 (de) 1985-08-02 1985-08-02 Verfahren zum strangpressen bzw. strangziehen

Publications (3)

Publication Number Publication Date
EP0210568A2 true EP0210568A2 (fr) 1987-02-04
EP0210568A3 EP0210568A3 (en) 1989-01-25
EP0210568B1 EP0210568B1 (fr) 1994-03-09

Family

ID=6277590

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86109982A Expired - Lifetime EP0210568B1 (fr) 1985-08-02 1986-07-21 Procédé d'extrusion, respectivement d'étirage

Country Status (3)

Country Link
EP (1) EP0210568B1 (fr)
AT (1) ATE102509T1 (fr)
DE (2) DE3527864A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0281515A3 (en) * 1987-03-02 1990-08-29 Aluminium Ag Menziken Method of extrusion, and cooling device for a press for the extrusion of light metals
US6360576B1 (en) * 1996-11-04 2002-03-26 Alusuisse Technology & Management Ag Process for extruding a metal section

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013010836A1 (de) 2013-07-10 2015-01-15 Messer Group Gmbh Vorrichtung zum Strangpressen von Werkstücken, insbesondere aus Aluminiumlegierungen
DE102023115493A1 (de) * 2023-06-14 2024-12-19 Air Liquide Deutschland Gmbh Herstellung eines Aluminiumstrangs

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2206977A (en) * 1937-11-20 1940-07-09 Western Electric Co Apparatus for extruding metal sheath or pipe
FR980781A (fr) * 1943-03-03 1951-05-17 Duralumin Soc Du Perfectionnement au filage à chaud des métaux
FR980780A (fr) * 1943-03-03 1951-05-17 Duralumin Soc Du Perfectionnement au filage à chaud des métaux
GB777845A (en) * 1954-07-02 1957-06-26 British Insulated Callenders Improvements in or relating to the metal sheathing of electric cables
GB943530A (en) * 1962-07-19 1963-12-04 Hubert Josef Altwicker Improvements in and relating to the extrusion of aluminium and aluminium alloys
DE1452207A1 (de) * 1962-07-27 1968-12-19 Baltwin Lima Hamilton Corp Verfahren und Vorrichtung zum Strangpressen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0281515A3 (en) * 1987-03-02 1990-08-29 Aluminium Ag Menziken Method of extrusion, and cooling device for a press for the extrusion of light metals
US6360576B1 (en) * 1996-11-04 2002-03-26 Alusuisse Technology & Management Ag Process for extruding a metal section

Also Published As

Publication number Publication date
EP0210568A3 (en) 1989-01-25
DE3689700D1 (de) 1994-04-14
ATE102509T1 (de) 1994-03-15
DE3527864A1 (de) 1987-02-05
EP0210568B1 (fr) 1994-03-09

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