EP1076103A2 - Procédé et dispositif pour le traitement thermique de tôles - Google Patents

Procédé et dispositif pour le traitement thermique de tôles Download PDF

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Publication number
EP1076103A2
EP1076103A2 EP00116544A EP00116544A EP1076103A2 EP 1076103 A2 EP1076103 A2 EP 1076103A2 EP 00116544 A EP00116544 A EP 00116544A EP 00116544 A EP00116544 A EP 00116544A EP 1076103 A2 EP1076103 A2 EP 1076103A2
Authority
EP
European Patent Office
Prior art keywords
zones
nozzle
sheets
quette
stand
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
EP00116544A
Other languages
German (de)
English (en)
Other versions
EP1076103B1 (fr
EP1076103A3 (fr
Inventor
Friedhelm Dr. Kühn
Sahibzada Saeedur Rahman Dr. Laiquddin
Ernst Mertl
Uwe Göhlen
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.)
Salzgitter AG
LOI Thermprocess GmbH
Original Assignee
Salzgitter AG
LOI Thermprocess 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 Salzgitter AG, LOI Thermprocess GmbH filed Critical Salzgitter AG
Publication of EP1076103A2 publication Critical patent/EP1076103A2/fr
Publication of EP1076103A3 publication Critical patent/EP1076103A3/fr
Application granted granted Critical
Publication of EP1076103B1 publication Critical patent/EP1076103B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • C21D2221/00—Treating localised areas of an article

Definitions

  • This process is used when tempering heavy plates.
  • the sheets will hardened by quenching and tempered in the further course of tempering. You can find them, for example, in shipbuilding, construction, piping and container construction Use or also for the production of parts with a particularly high Wear, e.g. B. excavator shovels.
  • the thickness of the sheets can be 60 mm and more. Also the thickness of the sheets can be be much smaller, namely less than 10 mm and also less than 5 mm.
  • the invention is therefore based on the object, in particular the heat treatment of thin and very thin sheets to less than 5 mm in such a way that after the hardening of sheets of excellent flatness, which is followed by cold straightening make redundant.
  • the method mentioned at the outset is thereby according to the invention characterized in that the top and bottom of the sheets each in a plurality of Zones are divided and that the zones with different speeds and / or intensity and / or duration and / or quenched at different times become.
  • the invention is based on the knowledge that the distortion of the sheets during hardening So far it was due to the fact that the different structural changes were not have been sufficiently taken into account.
  • the sheets Before hardening, the sheets are heated to approx. 940 ° C heated to achieve an austenitic structure. When quenched, martensite is formed, which results in an enlarged structure. If the quenching is uneven, this enlargement of the structure cannot be compensated for.
  • the sheet metal with a small thickness of less than 10 mm have considerable dimensions, for example 14 mx 3.5 m.
  • the material undulates in the middle; at a faster edge cooling results in edge waves.
  • the invention offers the possibility of optimally taking into account the respective conditions, where the decisive parameters from the material analysis, the thickness dependency and the width dependency result. Furthermore, the conditions on the The top and bottom of the sheets must be taken into account separately. Result it different conditions for the middle, the sides, the corners and the front and rear end areas.
  • the flexibility of the invention The procedure takes these circumstances into account. The procedure is particularly suitable for the treatment of thin sheets, but is an advantage also applicable to thick sheets.
  • the quenching rate is preferably determined in each case by the amount of water Area and time unit and / or set by the water temperature.
  • the quenching intensity can be determined by the spray distance above and below of the sheet can be adjusted. For a given nozzle angle, you can use this Generate different spray patterns.
  • the spray distances can change during of the deterrent change to account for the respective operating conditions wear. An influence that differs from zone to zone is also possible, however also with considerable effort.
  • the geometrical configuration and arrangement of the zones can also be the same Take into account quenching parameters. It has proven to be advantageous if the zones extend in the transport direction of the sheets, whereby to take into account that the sheets are transported aligned in the longitudinal direction. Three zones oriented in the direction of transport have proven to be particularly favorable proven.
  • the zones can also extend transversely to the direction of transport, specifically in particular in such a way that a longitudinal and transverse pattern is created. Also in The transverse direction is advantageously worked with three zones.
  • the method according to the invention can take into account another effect: results from the transport of the sheets.
  • the sheets leave the furnace at approx. 940 ° C.
  • An effective quenching process should begin as soon as possible. But there are limits to this through the transport system.
  • the rear end leaves the furnace clearly later than the front end, even if at high transport speeds of approx. 120 m / min.
  • the front sheet end up to a standstill on the roller conveyor of the stand quette, a significantly higher number overflowed with rollers than the rear sheet end.
  • the result is the front one Sheet end significantly cooler than the rear sheet end.
  • the temperature difference can can be 100 K.
  • the temperature preferably increases in the direction of transport. It follows after Transport and at the beginning of the quenching process an almost constant Sheet temperature over the sheet length.
  • Each batch can consist of a single sheet metal sheet or of secondary and / or individual sheets arranged one behind the other. Wear the treatment parameters the respective sheet geometry and assignment. The parameters are in saved on a computer and can be called up as required.
  • the invention is also directed to a stand quette for batch quenching of heated sheets, with a roller table and a plurality of nozzles that arranged above and below the roller table and with interposition of control means are connected to a water supply.
  • This standquette is to achieve the object according to the invention characterized in that the nozzles are combined into nozzle zones and that the nozzles of each zone in Parallel connection to the control means are connected.
  • the stand quette according to the invention enables the quenching process to be carried out variably and thus a practice of the method according to the invention.
  • the nozzles are preferably formed by nozzle tubes which are transverse to the direction of transport extend of the roller conveyor and in sealed against each other, separately pipe sections connected to the control means are divided. It is advantageous to provide three pipe sections and the middle pipe section via one to be connected to the control means by one of the pipes leading to the side of the pipe.
  • the upper nozzles can be activated while lowering the upper Quettenrahmen be switched on.
  • the desired spray pattern is achieved in this way.
  • spraying only begins when the nozzles have a predetermined distance have reached above the sheets.
  • their deterrence lasts only a few seconds, the first phase of the quenching process is special Importance.
  • the invention is further developed proposed the lifting height of the upper Quettenrahmen depending on the To control the thickness of the sheet to be quenched. So if very thin sheets are processed, so it is no longer necessary to raise the upper Quettenrahmen so high as would be required for example with sheets with a thickness of 60 mm. Rather, a lifting height is sufficient to enable the thin sheets to be retracted. The The lowering process of the Quettenrahmen is thus reduced to a minimum in time that the quenching process can be started early.
  • the stand quette be a device upstream to the defined alignment of the sheets in order to disturb the zone and Avoid grouping when spraying the water. Usually will this device is already upstream of the furnace.
  • the invention includes a chambered spherical roller hearth heating system with a stand quette according to the invention.
  • Such heating systems are operated batch or batch.
  • the chamber is a roller hearth, the Rollers are constantly moving for reasons of stability, so that a pendulum movement arises.
  • With such a heating system in contrast to a continuous one operated continuous heating system zones with different temperatures be set up.
  • the sheet is divided into nine zones on its top and bottom, which in turn are grouped into four groups, namely group 8 with two zones front / outside and two zones rear / outside, group 4 with two zones Center / outside, group 1 with a zone in front / center and a zone in the back / center, as well Group 3 with a central zone. All zones of each group are on the Quenched based on common parameters.
  • the division of the bottom corresponds that of the top, these groups can be controlled differently than that of the Top.
  • Figure 2 shows a nozzle tube, which in three mutually sealed tube sections 11, 12 and 13 is divided.
  • the pipe sections are via separate lines connected to control means, not shown, namely the pipe section 11 via a line 14, the pipe section 12 via a line 15 and the pipe section 13 via a line 16.
  • the line 15 leads through the pipe section 13.
  • the individual pipe sections can therefore be controlled separately.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Tunnel Furnaces (AREA)
EP00116544A 1999-08-10 2000-08-01 Procédé et dispositif pour le traitement thermique de tôles Expired - Lifetime EP1076103B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19937764A DE19937764A1 (de) 1999-08-10 1999-08-10 Verfahren und Vorrichtung zum Wärmebehandeln von Blechen
DE19937764 1999-08-10

Publications (3)

Publication Number Publication Date
EP1076103A2 true EP1076103A2 (fr) 2001-02-14
EP1076103A3 EP1076103A3 (fr) 2003-04-02
EP1076103B1 EP1076103B1 (fr) 2005-12-28

Family

ID=7917870

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00116544A Expired - Lifetime EP1076103B1 (fr) 1999-08-10 2000-08-01 Procédé et dispositif pour le traitement thermique de tôles

Country Status (3)

Country Link
EP (1) EP1076103B1 (fr)
AT (1) ATE314491T1 (fr)
DE (2) DE19937764A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3141619B1 (fr) 2015-09-08 2019-04-17 ThyssenKrupp Steel Europe AG Procédé et dispositif de réglage d'une propriété mécanique d'une pièce usinée en acier

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE886002C (de) * 1942-10-09 1953-08-10 Hoerder Huettenunion Ag Verfahren zum Haerten von Blechen
JPS5848019B2 (ja) * 1979-11-09 1983-10-26 石川島播磨重工業株式会社 鋼板の噴霧冷却方法及びその装置
JPS60174833A (ja) * 1984-02-20 1985-09-09 Nippon Steel Corp 熱鋼板の冷却方法
JPS60197825A (ja) * 1984-03-19 1985-10-07 Yokogawa Hokushin Electric Corp 冷却制御方法
BE1010419A3 (fr) * 1996-07-11 1998-07-07 Ti Consult Procede et dispositif de trempe de produits metalliques plats.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3141619B1 (fr) 2015-09-08 2019-04-17 ThyssenKrupp Steel Europe AG Procédé et dispositif de réglage d'une propriété mécanique d'une pièce usinée en acier

Also Published As

Publication number Publication date
ATE314491T1 (de) 2006-01-15
DE50011947D1 (de) 2006-02-02
EP1076103B1 (fr) 2005-12-28
DE19937764A1 (de) 2001-02-15
EP1076103A3 (fr) 2003-04-02

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