EP1847342B1 - Procédé et dispositif destinés à l'aspersion de gaz d'installations de production de formage à chaud - Google Patents
Procédé et dispositif destinés à l'aspersion de gaz d'installations de production de formage à chaud Download PDFInfo
- Publication number
- EP1847342B1 EP1847342B1 EP07007544.5A EP07007544A EP1847342B1 EP 1847342 B1 EP1847342 B1 EP 1847342B1 EP 07007544 A EP07007544 A EP 07007544A EP 1847342 B1 EP1847342 B1 EP 1847342B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- continuous furnace
- protective gas
- press
- pressing chamber
- production facility
- 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
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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
- B21J17/00—Forge furnaces
-
- 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
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/613—Gases; Liquefied or solidified normally gaseous material
Definitions
- the invention relates to a method according to the preamble of claim 1 for producing a protective gas atmosphere in a production plant for hot forming of metals consisting of a continuous furnace, the continuous furnace is heated via nozzles, a press with press room and a closed transport channel between the continuous furnace and the press room, said the metal is heated in the continuous furnace, transferred via the transport channel in the press with press room and formed there and cooled simultaneously, and a device according to the preamble of claim 10 for carrying out the method.
- a method and apparatus for producing a protective gas atmosphere in a production plant for hot forming for example, from JP-A-58157543 known.
- the punched metal parts are heated in a continuous furnace, which is heated by a firing by means of jet pipes, 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 results in increased strength with less 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 sandblasting operation even with conventional materials, without transport channel and Overheat press.
- 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 while avoiding the overheating of the transport channel and press. This is achieved by the supply of the still cold shielding 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 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. An increase in the inert gas supply ensures that the contamination of the protective gas atmosphere is minimized by the removal of the deformed 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. Due to the high injection effect of the high-pressure lances optimum mixing and a homogeneous inert gas atmosphere is achieved, which is a prerequisite for the determination of the carbon level of the metal parts by the common methods.
- 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 flow of gas from the continuous furnace sets in the direction of the press. This avoids that contamination created during the service intervention with Oxygen in the transport channel or in the press room in the continuous furnace are pressed.
- 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 nearly 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, are 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 with gas-tight service flaps to the environment of the production plant as well as with a gas-tight door between continuous furnace and Transport channel equipped to prevent the annealing atmosphere by an inevitable air intrusion 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 workpiece in the protective gas atmosphere until the completion of the deformation and cooling not only the surfaces, but also the cutting edges resulting from the punching are protected.
- the overheating of transport channel and press by the hot inert gas atmosphere from the continuous furnace is avoided.
- the stamped metal is heated in the jet pipe heated 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)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Details (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Claims (19)
- Procédé de formation d'une atmosphère de gaz protecteur dans une installation de production destinée à façonner à chaud des métaux et constituée
d'un four (1) traversé en continu, le four traversé en continu étant chauffé par des tubes radiants,
d'une presse dotée d'un espace (3) de presse et d'un canal fermé de transport (2) disposé entre le four traversé en continu et l'espace de presse,
le métal étant chauffé dans le four (1) traversé en continu et étant transféré par le canal de transport (2) dans la presse dotée de l'espace (3) de presse pour y être façonné et en même temps refroidi,
caractérisé en ce que
le gaz de protection est injecté complètement ou partiellement dans le four (1) traversé en continu par l'intermédiaire de l'espace (3) de presse et/ou par l'intermédiaire du canal de transport (2),
en ce que la presse dotée de l'espace (3) de presse est raccordée au four (1) traversé en continu par l'intermédiaire du canal fermé de transport (2) de manière à établir entre l'entrée du four et l'espace de presse une atmosphère fermée de gaz protecteur et
en ce que le métal n'est extrait de l'atmosphère de gaz protecteur qu'après le façonnage et le refroidissement. - Procédé selon la revendication 1, caractérisé en ce que le gaz protecteur est injecté en proportions égales dans le four traversé en continu par l'intermédiaire de l'espace (3) de presse et/ou du canal de transport (2) et directement dans le four (2) traversé en continu à l'extrémité du four traversé en continu.
- Procédé selon les revendications 1 ou 2, caractérisé en ce que le métal façonné est repris par le bas dans un dispositif de reprise (4) par l'intermédiaire d'un sas.
- Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le métal façonné est repris horizontalement vers l'arrière par l'intermédiaire d'un sas et à l'aide d'un manipulateur prévu dans le dispositif de reprise (4), l'apport de gaz protecteur étant augmenté pendant la reprise.
- Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la teneur en dioxyde de carbone de l'atmosphère de gaz protecteur dans la partie arrière du four (1) traversé en continu est ajustée par l'intermédiaire d'une boucle de régulation d'atmosphère.
- Procédé selon l'une des revendications 1 à 5, caractérisé en ce que la régulation de la teneur en dioxyde de carbone par une boucle de régulation d'atmosphère s'effectue en apportant du gaz contenant des hydrocarbures, en particulier du gaz naturel ou du propane, par au moins une lance à haute pression située à l'extrémité du four (1) traversé en continu.
- Procédé selon l'une des revendications 1 à 6, caractérisé en ce que lorsque la forme souhaitée du métal façonné est modifiée, un module qui comprend un poussoir et une matrice de la presse est remplacé.
- Procédé selon l'une des revendications 1 à 7, caractérisé en ce que le poussoir de la presse est amené contre la matrice par le bas.
- Procédé selon l'une des revendications 1 à 8, caractérisé en ce qu'après une intervention de maintenance sur le canal de transport et/ou sur la presse ou après un remplacement du module de la presse, l'apport de gaz de protection est régulé de manière à établir un débit net de gaz entre le four traversé en continu et la presse.
- Dispositif de formation d'une atmosphère de gaz protecteur dans une installation de production destinée à façonner à chaud des métaux et constituée
d'un four (1) traversé en continu, le four traversé en continu étant chauffé par des tubes radiants,
d'une presse dotée d'un espace (3) de presse et d'un canal fermé de transport (2) disposé entre le four traversé en continu et l'espace de presse,
le métal étant chauffé dans le four (1) traversé en continu et étant transféré par le canal de transport (2) dans la presse dotée de l'espace (3) de presse pour y être façonné et en même temps refroidi,
caractérisé en ce que
l'installation de production présente au moins un apport de gaz protecteur dans l'espace (3) de presse et/ou un apport de gaz protecteur dans le canal de transport et
en ce que l'ensemble de l'installation de production est séparée de l'environnement de manière étanche aux gaz ou pratiquement étanche aux gaz. - Dispositif selon la revendication 10, caractérisé en ce que l'installation de production présente au moins un apport de gaz protecteur dans l'espace (3) de presse et/ou dans le canal de transport (2) et au moins un apport de gaz protecteur à l'extrémité du four (1) traversé en continu.
- Dispositif selon les revendications 10 ou 11, caractérisé en ce que l'installation de production présente un dispositif de reprise du métal (4) façonné, ce dispositif présentant au moins une porte, étanche aux gaz, s'ouvrant vers l'espace de presse et au moins une porte, étanche aux gaz, s'ouvrant vers l'environnement du dispositif.
- Dispositif selon l'une des revendications 10 à 12, caractérisé en ce que la porte s'ouvrant vers l'environnement de l'installation de production s'ouvre vers le bas.
- Dispositif selon l'une des revendications 10 à 13, caractérisé en ce que la porte s'ouvrant vers l'environnement de l'installation de production s'ouvre vers l'arrière, là où est situé un dispositif de reprise automatique du métal façonné (manipulateur).
- Dispositif selon l'une des revendications 10 à 14, caractérisé en ce qu'un dispositif de régulation de la teneur en dioxyde de carbone de l'atmosphère de gaz protecteur est situé dans la partie arrière du four (1) traversé en continu.
- Dispositif selon l'une des revendications 10 à 15, caractérisé en ce qu'au moins une lance à haute pression servant à apporter du gaz contenant des hydrocarbures, en particulier du gaz naturel ou du propane, est située dans la partie arrière du four (1) traversé en continu.
- Dispositif selon l'une des revendications 10 à 16, caractérisé en ce que pour permettre la maintenance, l'ensemble de l'installation de production est équipée de clapets de maintenance étanches aux gaz qui la séparent de l'environnement de l'installation de production ainsi que d'une porte étanche aux gaz située entre le four traversé en continu et le canal de transport.
- Dispositif selon l'une des revendications 10 à 17, caractérisé en ce que l'installation de production présente un module qui comporte un poussoir et une matrice de la presse et qui peut être remplacé complètement.
- Dispositif selon l'une des revendications 10 à 18, caractérisé en ce que le poussoir peut être déplacé depuis le bas en direction de la matrice fixe située au-dessus de lui.
Priority Applications (1)
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 |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006018383 | 2006-04-20 | ||
EP06017998A 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 |
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 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1847342A1 EP1847342A1 (fr) | 2007-10-24 |
EP1847342B1 true EP1847342B1 (fr) | 2013-11-20 |
Family
ID=38089145
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07007544.5A Not-in-force 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 |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP1847342B1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012001335B4 (de) * | 2012-01-25 | 2017-07-27 | Elisabeth Braun | Warmumformeinrichtung |
CN102717023A (zh) * | 2012-06-28 | 2012-10-10 | 江苏金源锻造股份有限公司 | 一种天然气加热炉 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2822162A (en) * | 1952-05-05 | 1958-02-04 | Surface Combustion Corp | Metal article treating apparatus |
US2944500A (en) * | 1954-10-22 | 1960-07-12 | Rohr Aircraft Corp | Machine for forming sheet metal |
GB818427A (en) * | 1957-01-09 | 1959-08-19 | Martin Van Marle | Improvements in or relating to continuous reheating furnaces |
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 |
CH593732A5 (fr) * | 1975-12-19 | 1977-12-15 | Bbc Brown Boveri & Cie | |
JPS56111528A (en) * | 1980-02-12 | 1981-09-03 | Nissan Motor Co Ltd | Method for interchanging press die of press machine |
JPS58157543A (ja) * | 1982-03-12 | 1983-09-19 | Goto Tanko Kk | 鍛造法 |
JPS58157544A (ja) * | 1982-03-12 | 1983-09-19 | Goto Tanko Kk | 鍛造法 |
-
2007
- 2007-04-12 EP EP07007544.5A patent/EP1847342B1/fr not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
EP1847342A1 (fr) | 2007-10-24 |
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