EP1847341A1 - Procédé et dispositif pour l'introduction de gaz de protection dans des installations de formage à chaud - Google Patents

Procédé et dispositif pour l'introduction de gaz de protection dans des installations de formage à chaud Download PDF

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Publication number
EP1847341A1
EP1847341A1 EP06017998A EP06017998A EP1847341A1 EP 1847341 A1 EP1847341 A1 EP 1847341A1 EP 06017998 A EP06017998 A EP 06017998A EP 06017998 A EP06017998 A EP 06017998A EP 1847341 A1 EP1847341 A1 EP 1847341A1
Authority
EP
European Patent Office
Prior art keywords
press
continuous furnace
gas
transport channel
production plant
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.)
Withdrawn
Application number
EP06017998A
Other languages
German (de)
English (en)
Inventor
Thomas Mahlo
Gerd Waning
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 EP07007544.5A priority Critical patent/EP1847342B1/fr
Priority to ES07007544T priority patent/ES2447432T3/es
Publication of EP1847341A1 publication Critical patent/EP1847341A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/08—Accessories for handling work or tools
    • B21J13/085—Accessories for handling work or tools handling of tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J17/00—Forge furnaces

Definitions

  • the invention relates to a method for producing a protective gas atmosphere in a production plant for hot forming of metals consisting of a continuous furnace, a press with press room and a closed transport channel between the continuous furnace and the press room, wherein the metal heated in the continuous furnace, via the transport channel in the press Press room converted and reformed there and cooled simultaneously, and an apparatus for performing the method.
  • the punched metal parts are heated in a continuous furnace up to the temperature range of the austenite.
  • the hot metal parts are transferred from the continuous furnace in a press with press room and pressed there in their respective form.
  • the press operates at a lower temperature (for example room temperature) so that the workpieces are cooled in a controlled manner during the forming.
  • the combination of the shaping of the hot materials and their controlled cooling leads to increased strength at a lower weight compared to cold forming.
  • the newer method can be dispensed with the sandblasting of the deformed material, however, the aluminum-clad material is significantly more expensive than conventional material.
  • the scale formation is avoided only on the material surface, but not on the cutting edges of the blanking of the sheets, so that here also a post-processing is required.
  • the present invention has for its object a method and an apparatus for performing the method in such a way that the scale formation is avoided in the hot working at the cutting edges of the sheets and can be dispensed with the operation of sandblasting in conventional materials.
  • the protective gas is fed completely or partially via the press room and / or via the transport channel in the continuous furnace, wherein the press is connected to press room on the closed transport channel with the continuous furnace, so that a closed inert gas atmosphere of Furnace inlet to the press room is formed and the metal is led out of the inert gas atmosphere only after the forming and cooling.
  • the basic idea of the invention is to expand the protective gas atmosphere to the transport path and the press room. This is achieved by the supply of the protective gas via the press room and / or the closed transport channel and the removal of the deformed metal from the protective gas atmosphere after forming. As a result, the workpiece comes into contact with oxygen only after the forming and cooling and no non-adherent scale layer forms.
  • By feeding the protective gas into the press room it is possible to counteract the pumping action which is generated by the press moving up and down.
  • the supply of the protective gas in the press room and / or the transport channel prevents excessive heating of the press by the hot furnace gases.
  • the protective gas is fed in equal parts via the press room and / or transport channel in the continuous furnace and directly at the end of the continuous furnace in the continuous furnace.
  • the continuous furnace is connected to the press room via the closed transport channel.
  • the deformed metal is removed in a removal device via a lock down.
  • a lock contamination of the protective gas atmosphere by the atmosphere outside the production plant (usually air) is avoided.
  • the formed metal is passed after forming and cooling in the lock, in which protective gas atmosphere prevails. With a removal through the lock down only a small air leakage occurs in the lock, without contaminating the protective gas atmosphere in the remaining part of the production plant.
  • the lock is flushed with inert gas before the next opening to the press room.
  • the deformed metal is removed horizontally to the rear using a manipulator. During the removal, the otherwise closed door is opened, thereby increasing the protective gas supply. Also In this embodiment, the deformed metal is discharged from the production plant, without causing contamination of the protective gas atmosphere of the production plant.
  • the use of a removal to the rear proves to be particularly favorable at some locations of the production plant. Increasing the inert gas supply ensures that the contamination of the bulk gas atmosphere is minimized by the removal of the reformed metal.
  • the carbon dioxide content of the protective gas atmosphere in the rear region of the continuous furnace is preferably set via an atmosphere control circuit.
  • the composition of the atmosphere in the continuous furnace is analyzed and controlled by measuring the carbon dioxide content with a suitable measuring probe, preferably an infrared analyzer.
  • the ratio of carbon dioxide to carbon monoxide is a very good and well-known measure of the quality of the atmosphere in terms of its oxidation and decarburisation effect.
  • the high-pressure lance has a specially designed nozzle, at which the nitrogen carrier gas mixes under high pressure with the hydrocarbon-containing gas (see DE102004047985 ).
  • the hydrocarbons of the hydrocarbon-containing gas supplied, in particular natural gas or propane, react with moisture present in the continuous furnace and carbon dioxide to form carbon monoxide and hydrogen and thus reduce the carbon dioxide content and dew point of the protective gas atmosphere.
  • the supply of nitrogen under high pressure improves the mixing of the inert gas atmosphere.
  • a module comprising punch and die of the press, exchanged.
  • a simple and quick change of the desired shape of the formed metal is possible.
  • the punch of the press is guided from below against the die.
  • the supply of the protective gas is controlled so that a net gas flow from the continuous furnace sets in the direction of the press. This avoids that during the service intervention resulting pollution with oxygen in the transport channel or in the press room are pushed into the continuous furnace.
  • the adjustment of the direction of the net gas flow can be made by a suitable feed point in the transport channel.
  • the stated object is achieved in that the production plant has at least one supply of the protective gas in the press room and / or a supply of the protective gas in the transport channel and the entire production system is gas-tight or almost gas-tight with respect to the environment.
  • the production plant has at least one supply of the protective gas in the press room and / or the transport channel and at least one supply of the protective gas at the end of the continuous furnace.
  • the means for removing the shaped metal is advantageously provided as a lock with at least one gas-tight door to the press room and at least one gas-tight door to the environment of the production plant, the door opens down to the environment of the production plant
  • the door opens to the environment of the device to the rear, where there is a device for automatic removal of the deformed metal (manipulator).
  • a device for controlling the carbon dioxide content of the protective gas atmosphere and at least one high-pressure lance for supplying hydrocarbon-containing gas, in particular natural gas or propane, is preferably located in the rear region of the continuous furnace.
  • the device for controlling the carbon dioxide content of the protective gas atmosphere comprises a measuring probe, preferably an infrared analyzer, which is suitable for determining the carbon dioxide content, and an automatic control of the supplied amount of hydrocarbon-containing gas.
  • the entire device is expediently equipped with gas-tight service flaps for the environment of the production plant as well as with a gas-tight door between continuous furnace and transport channel in order not to change the annealing atmosphere due to an inevitable air breakdown during maintenance work.
  • the production plant has a compact module, which stamp and die of the press comprises and can be completely replaced.
  • the punch is movable from below against the above fixed die. By operating the press overhead, i. Stamp from below against the stationary die, is counteracted heating of the hydraulic oil.
  • the present invention succeeds in avoiding scale formation in the hot forming of metals without the need to use expensive aluminum-clad materials.
  • the punched metal is heated in the continuous furnace (1) and then passed through a closed transport channel (2) in the press (3), where the deformation takes place with simultaneous controlled cooling.
  • a closed transport channel (2) in the press (3) In the entire closed system (continuous furnace (1), transport channel (2) and press (3)) there is a low-oxygen inert gas atmosphere.
  • the workpiece is executed via a lock from the removal device (4) down. By taking it down, there is only a slight air leakage into the lock and the lock can be flushed very easily and with little gas before re-loading.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Furnace Details (AREA)
EP06017998A 2006-04-20 2006-08-29 Procédé et dispositif pour l'introduction de gaz de protection dans des installations de formage à chaud Withdrawn EP1847341A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07007544.5A EP1847342B1 (fr) 2006-04-20 2007-04-12 Procédé et dispositif destinés à l'aspersion de gaz d'installations de production de formage à chaud
ES07007544T ES2447432T3 (es) 2006-04-20 2007-04-12 Procedimiento y dispositivo para la gasificación de protección de instalaciones de producción para la transformación con calor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006018383 2006-04-20

Publications (1)

Publication Number Publication Date
EP1847341A1 true EP1847341A1 (fr) 2007-10-24

Family

ID=37682874

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06017998A Withdrawn EP1847341A1 (fr) 2006-04-20 2006-08-29 Procédé et dispositif pour l'introduction de gaz de protection dans des installations de formage à chaud

Country Status (2)

Country Link
EP (1) EP1847341A1 (fr)
ES (1) ES2447432T3 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2944500A (en) * 1954-10-22 1960-07-12 Rohr Aircraft Corp Machine for forming sheet metal
US3503240A (en) * 1966-08-01 1970-03-31 James R Lawler Heat treating method and apparatus
US3698219A (en) * 1971-05-10 1972-10-17 United Aircraft Corp Apparatus for forging
DE2601553A1 (de) * 1975-12-19 1977-06-30 Bbc Brown Boveri & Cie Vorrichtung zum isothermen schmieden von hochtemperaturlegierungen
JPS56111528A (en) * 1980-02-12 1981-09-03 Nissan Motor Co Ltd Method for interchanging press die of press machine
JPS58157544A (ja) * 1982-03-12 1983-09-19 Goto Tanko Kk 鍛造法
JPS58157543A (ja) * 1982-03-12 1983-09-19 Goto Tanko Kk 鍛造法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2944500A (en) * 1954-10-22 1960-07-12 Rohr Aircraft Corp Machine for forming sheet metal
US3503240A (en) * 1966-08-01 1970-03-31 James R Lawler Heat treating method and apparatus
US3698219A (en) * 1971-05-10 1972-10-17 United Aircraft Corp Apparatus for forging
DE2601553A1 (de) * 1975-12-19 1977-06-30 Bbc Brown Boveri & Cie Vorrichtung zum isothermen schmieden von hochtemperaturlegierungen
JPS56111528A (en) * 1980-02-12 1981-09-03 Nissan Motor Co Ltd Method for interchanging press die of press machine
JPS58157544A (ja) * 1982-03-12 1983-09-19 Goto Tanko Kk 鍛造法
JPS58157543A (ja) * 1982-03-12 1983-09-19 Goto Tanko Kk 鍛造法

Also Published As

Publication number Publication date
ES2447432T3 (es) 2014-03-12

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