EP1445338A1 - Verfahren zum Wärmebehandeln von Metallteilen unter Schutzgas - Google Patents
Verfahren zum Wärmebehandeln von Metallteilen unter Schutzgas Download PDFInfo
- Publication number
- EP1445338A1 EP1445338A1 EP04002129A EP04002129A EP1445338A1 EP 1445338 A1 EP1445338 A1 EP 1445338A1 EP 04002129 A EP04002129 A EP 04002129A EP 04002129 A EP04002129 A EP 04002129A EP 1445338 A1 EP1445338 A1 EP 1445338A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- protective gas
- current consumption
- gas atmosphere
- phase
- electric motor
- 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
Links
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Classifications
-
- 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
- C21D11/00—Process control or regulation for heat treatments
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B11/00—Bell-type furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining or circulating atmospheres in heating chambers
- F27D7/04—Circulating atmospheres by mechanical means
Definitions
- the invention relates to a method for heat treating metal parts in a protective gas atmosphere in an annealing room, the metal parts during a heating phase is heated, during a holding phase on one essentially kept constant temperature and possibly during a cooling phase be cooled.
- the protective gas can, for example neutral inert gas such as nitrogen and / or a reducing gas such as hydrogen or a carbon-containing gas or a mixture of gases.
- the glow room is usually heated indirectly.
- An important heat treatment process is the annealing of metal parts in Bell annealing furnaces, for example the bright or recrystallization annealing from Sheets, strips or wires, which are wound into coils and for annealing stacked on top of each other.
- the surface of the sheets, strips or wires are covered with roller emulsions or Oil contaminated. It is for achieving a high surface cleanliness required that the protective gas atmosphere be exchanged, d. H. that the glow room is rinsed. When rinsing is carried out continuously or at predetermined intervals Shielding gas introduced into the glow room while the shielding gas atmosphere flows. So far, the protective gas supply has been carried out according to fixed, predetermined conditions Flushing rates or with specified volume flows and according to the calculated Flushing times.
- purging is usually carried out at intervals with a predetermined flow of protective gas, namely approximately 5 to 35 m 3 per hour.
- the shielding gas consumption which significantly influences the annealing costs, is with the known method relatively large. Still, a consistent is sufficient Surface cleanliness not guaranteed because of the emulsion or Amounts of oil on the surface of the metal parts can be very different.
- Another problem is that unwanted reactions during the Heat treatment, such as methane formation from crack products or soot formation due to methane decay in the holding phase and / or the cooling phase or Dew point changes cannot be determined.
- the object of the invention is accordingly to remedy these shortcomings and to provide a method by which to control the heat treatment process or the flushing process is improved and the shielding gas consumption can be reduced.
- the invention is based on the knowledge that the current consumption of the Electric motor changes depending on the density of the protective gas atmosphere. Since in the holding phase the temperature of the protective gas atmosphere essentially constant, can not change the density due to temperature are recorded, in particular changes in density due to increased oil or Emulsion evaporation rates.
- the change in current consumption can be used as a signal to control the heat treatment process and / or to control the Exchange of the protective gas can be used. For example, the change the current consumption as a signal for adjusting the flush volume or Volume flow of the protective gas in phases of higher evaporation of roller emulsions or oils from the surface of the metal parts.
- the formation of methane from crack products or the formation of soot due to methane breakdown in the holding phase and / or the cooling phase or dew point changes can be determined and the heat treatment process controlled accordingly become.
- a fan of low power with a standardized motor can only be used for the purpose of detecting changes in density. On such an auxiliary fan provides accurate measurement data.
- the exchange of the protective gas can be controlled via flushing programs, the volume flow of the inflowing protective gas or the outflowing Shielding gas atmosphere, the number and / or the duration of purging intervals Taxes.
- the volume flow can be changed, for example, by a outlet-side control valve is adjusted in the opening direction and consequently more Shielding gas flows into the annealing chamber of the bell annealer.
- Rinse programs can be created or based on the actual values of the current consumption be optimized.
- the flush volume or the volume flow can be changed of the protective gas and / or the purging time depending on the evaporation behavior the coil stack can be controlled.
- the example is a process for bright annealing steel sheets in an annealing room of a bell annealer, not shown a circulation fan in a protective gas atmosphere, which essentially consists of hydrogen.
- a protective gas atmosphere which essentially consists of hydrogen.
- the rinsing is controlled by means of a rinsing program.
- protective gas is through a protective gas line, in which in a known manner controllable valve is supplied.
- the protective gas atmosphere overflows an outlet line, in which there is also a valve.
- the drawing shows the current consumption (amperes) of the electric motor of the circulation fan and the protective gas volume flow (m 3 per hour) as a function of time (hours).
- the diagram shown in the drawing shows a heating phase A, a Hold phase B and a cooling phase C.
- the current consumption of the electric motor is shown with a solid line.
- the inert gas volume flow is shown as a dashed line.
- the protective gas atmosphere is set to a fixed value Temperature, here approx. 700 ° C heated.
- Temperature here approx. 700 ° C heated.
- the first increase in power consumption is due to the speed increase. After that, the current consumption drops because the density of the protective gas atmosphere decreases with increasing temperature.
- the temperature of the protective gas atmosphere is kept essentially constant.
- the speed of the circulation fan is also constant.
- the protective gas is introduced into the glow chamber with a minimal volume flow and the protective gas atmosphere is removed, depending on a setpoint.
- the setpoint of the volume flow is determined on the basis of the minimum requirements for surface cleanliness and minimal loading of the surface of the steel strips with emulsion or oil and can be 2 m 3 to 20 m 3 per hour. In the exemplary embodiment, the volume flow is approximately 3 m 3 .
- the increase in current consumption shown in the diagram is due to a rise in the density of the protective gas atmosphere due to a high proportion of evaporating oil vapors.
- the increase in the current consumption of the electric motor of the circulation fan is used as a signal to control the exchange the protective gas atmosphere.
- the Volume flow of the protective gas supplied increases until the current consumption is constant again or decreases. By rinsing according to needs the purge gas consumption was kept low.
- the temperature of the protective gas atmosphere is cooled.
- the current consumption of the motor increases according to a defined setpoint curve according to the increase in density.
- the current consumption of the electric motor is compared with the setpoint curve. Any deviation in the curve the current consumption thus indicates an additional change in the atmospheric density conclude. This can, for example, lead to undesired methane formation his. If the actual value deviates from the respective setpoint, a Signal formed to control the heat treatment process and / or is used to control the exchange of the protective gas atmosphere.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Furnace Details (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
Claims (4)
- Verfahren zum Wärmebehandeln von Metallteilen in einer Schutzgasatmosphäre in einem Glühraum, wobei die Metallteile während einer Aufheizphase (A) aufgeheizt, während einer Haltephase (B) auf einer im wesentlichen konstanten Temperatur gehalten und ggf. während einer Abkühlphase (C) abgekühlt werden,
dadurch gekennzeichnet, dass in der Schutzgasatmosphäre kontinuierlich ein Gebläse mit einer konstanten Drehzahl umläuft,
dass das Gebläse von einem Elektromotor angetriebenen wird,
dass die Stromaufnahme des Elektromotors erfasst wird und
dass in der Haltephase die Änderung der Stromaufnahme des Gebläses als Signal zur Steuerung des Wärmebehandlungsprozesses und/oder zur Steuerung des Austausches der Schutzgasatmosphäre genutzt wird. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass während der Aufheizphase (A) und ggf. der Abkühlphase (C) die Stromaufnahme des Elektromotors mit einer Sollwertkurve verglichen wird,
dass in Abhängigkeit von der Abweichung des Istwertes der Stromaufnahme vom Sollwert ein Signal gebildet wird, das zur Steuerung des Wärmebehandlungsprozesses und/oder zur Steuerung des Austausches der Schutzgasatmosphäre genutzt wird. - Verfahren nach einem der Ansprüche 1 oder 2,
wobei während der Haltephase (B) ein Schutzgas kontinuierlich oder in Intervallen mit vorgegebenem Volumenstrom in den Glühraum eingeleitet und Schutzgasatmosphäre abgeführt wird,
dadurch gekennzeichnet, dass Anzahl und/oder Länge der Spülintervalle und/oder der Volumenstrom des Schutzgases auf Mindestwerte eingestellt werden und dass bei einem Anstieg der Stromaufnahme des Elektromotors die Mindestwerte so lange erhöht werden bis die Stromaufnahme konstant ist oder sinkt. - Verfahren nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass ein Maximalwert der Stromaufnahme festgelegt wird und das bei einem Anstieg der Stromaufnahme über den Maximalwert hinaus die Anzahl der Spülintervalle verändert, Spülzeiten verlängert und/oder der Volumenstrom des Schutzgases so lange erhöht wird bis die Stromaufnahme unter einen eingestellten Sollwert sinkt.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10304945 | 2003-02-06 | ||
| DE10304945A DE10304945A1 (de) | 2003-02-06 | 2003-02-06 | Verfahren zum Wärmebehandeln von Metallteilen unter Schutzgas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1445338A1 true EP1445338A1 (de) | 2004-08-11 |
| EP1445338B1 EP1445338B1 (de) | 2009-05-27 |
Family
ID=32603187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04002129A Expired - Lifetime EP1445338B1 (de) | 2003-02-06 | 2004-02-02 | Verfahren zum Wärmebehandeln von Metallteilen unter Schutzgas |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1445338B1 (de) |
| AT (1) | ATE432368T1 (de) |
| DE (2) | DE10304945A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809286A (zh) * | 2012-08-15 | 2012-12-05 | 中冶南方(武汉)威仕工业炉有限公司 | 环形炉炉盘的检测和纠偏方法 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006025737B4 (de) * | 2006-05-31 | 2016-09-22 | Ald Vacuum Technologies Gmbh | Vorrichtung zur Gasabschreckung von wärmebehandelten Bauteilen und Verfahren zur Durchführung einer Gasabschreckung |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2789808A (en) * | 1954-11-05 | 1957-04-23 | Lee Wilson | Method of and apparatus for controlling circulation of furnace atmosphere |
| US4141539A (en) | 1977-11-03 | 1979-02-27 | Alco Standard Corporation | Heat treating furnace with load control for fan motor |
| US4543891A (en) * | 1984-04-12 | 1985-10-01 | Westinghouse Electric Corp. | Apparatus and process for heat treatment |
| US4571273A (en) | 1983-07-05 | 1986-02-18 | Ebner-Industrieofenbau Ing. Josef Ebner Kg | Process of heating and cooling charges in batch-process industrial furnaces |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE681750C (de) * | 1935-12-08 | 1939-09-30 | Siemens Schuckertwerke Akt Ges | Verfahren zur regelbaren Abkuehlung von Gluehoefen |
| DE732569C (de) * | 1940-07-23 | 1943-03-06 | Siemens Ag | Verfahren zur regelbaren Abkuehlung von Gluehoefen |
| GB653655A (en) * | 1948-03-31 | 1951-05-23 | Sunbeam Corp | Heat treating furnace |
| DD261380A5 (de) * | 1987-07-24 | 1988-10-26 | Ebner Industrieofenbau Gmbh,At | Verfahren zum betrieb eines konvektions-haubengluehofens, insb. fuer stahldraht- oder -bandbunde |
| DE4129879A1 (de) * | 1991-09-09 | 1993-03-11 | Loi Ind Ofenanlagen | Verfahren zum austausch der atmosphaere eines industrieofens |
-
2003
- 2003-02-06 DE DE10304945A patent/DE10304945A1/de not_active Ceased
-
2004
- 2004-02-02 AT AT04002129T patent/ATE432368T1/de active
- 2004-02-02 DE DE502004009515T patent/DE502004009515D1/de not_active Expired - Lifetime
- 2004-02-02 EP EP04002129A patent/EP1445338B1/de not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2789808A (en) * | 1954-11-05 | 1957-04-23 | Lee Wilson | Method of and apparatus for controlling circulation of furnace atmosphere |
| US4141539A (en) | 1977-11-03 | 1979-02-27 | Alco Standard Corporation | Heat treating furnace with load control for fan motor |
| US4571273A (en) | 1983-07-05 | 1986-02-18 | Ebner-Industrieofenbau Ing. Josef Ebner Kg | Process of heating and cooling charges in batch-process industrial furnaces |
| US4543891A (en) * | 1984-04-12 | 1985-10-01 | Westinghouse Electric Corp. | Apparatus and process for heat treatment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809286A (zh) * | 2012-08-15 | 2012-12-05 | 中冶南方(武汉)威仕工业炉有限公司 | 环形炉炉盘的检测和纠偏方法 |
| CN102809286B (zh) * | 2012-08-15 | 2014-12-10 | 中冶南方(武汉)威仕工业炉有限公司 | 环形炉炉盘的检测和纠偏方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1445338B1 (de) | 2009-05-27 |
| DE10304945A1 (de) | 2004-08-19 |
| DE502004009515D1 (de) | 2009-07-09 |
| ATE432368T1 (de) | 2009-06-15 |
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