EP0753587B1 - Plant for hardening and tempering metallic articles - Google Patents

Plant for hardening and tempering metallic articles Download PDF

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Publication number
EP0753587B1
EP0753587B1 EP96110951A EP96110951A EP0753587B1 EP 0753587 B1 EP0753587 B1 EP 0753587B1 EP 96110951 A EP96110951 A EP 96110951A EP 96110951 A EP96110951 A EP 96110951A EP 0753587 B1 EP0753587 B1 EP 0753587B1
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EP
European Patent Office
Prior art keywords
furnace
tempering
hardening
tempering furnace
cooling
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.)
Expired - Lifetime
Application number
EP96110951A
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German (de)
French (fr)
Other versions
EP0753587A1 (en
Inventor
Hans-Georg Dr.-Ing. Bittner
Hartmut Dipl.-Ing. Weber
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.)
WAERMETECHNIK HEIMSOTH GMBH & CO. KG
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Warmetechnik Heimsoth & Co KG GmbH
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Publication date
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Publication of EP0753587A1 publication Critical patent/EP0753587A1/en
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Anticipated expiration legal-status Critical
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    • 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
    • C21D9/0056—Furnaces through which the charge is moved in a horizontal straight path
    • 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
    • C21D1/673—Quenching devices for die 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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

Definitions

  • the invention relates to a device for tempering of metallic goods, especially for starting Tool steels after hardening, comprising an oven for Austenitizing the goods, a hardness press for the still hot Well, a tempering furnace to adjust the hardness and the Structure of the good and a promoting the good through the ovens Facility.
  • a device for tempering metallic goods, in particular for tempering tool steels, comprising an oven to austenitize the goods, a hardness press for that hot goods and a tempering furnace to adjust the hardness and the structure of the good is known: ("Heat treatment of the Structural and Tool Steels ", 3rd ed., Publisher Hans Bennighoff, Sigma Book series 1978, pp. 444 to 451 and Ruhfus, "Heat Treatment of Ferrous Materials", Verlag Stahl, Eisen mbH, 1958, pp. 380 to 383 and 386).
  • Air-hardening steels and tool steels are usually used tempered again after the hardening process.
  • the tempering temperature is selected according to the desired final hardness. Starting serves on the one hand, setting the exact hardness and desired structure and on the other hand as a straightening process. at known methods are therefore the individual parts in Stacked between 10 to 100 pieces clamped together then left on for between three and ten hours.
  • the invention aims to eliminate these disadvantages and beats starting from a device of the beginning mentioned type before that at the exit of the tempering furnace
  • Cooling presses are arranged for the purpose of temperature control Cooling of the goods
  • straightening presses inside the tempering furnace are arranged to the good for a certain period of time under a certain pressure and temperature to keep the goods conveying through the ovens
  • Device is designed as a roller conveyor so that the Device except for the pressing and straightening processes works continuously and that the good after leaving of the tempering furnace or after leaving the cooling presses either a further processing or again to the admission of the Tempering furnace is returned.
  • the actual hardening furnace is designated by 10 in the figure, it has an input area 11 and a preheating zone 12 and an austenitizing area 13. After leaving the furnace 10 the good reaches the hardness press 20, the works discontinuously. In this press is the good slowly and deliberately cooled and straightened at the same time.
  • Tempering furnace 30 has a preheating stage 31 as well as a temperature maintenance level 32 and beyond still equipped with straightening presses 33 in his furnace interior. This means that the good after it is the Holding stage has happened for a corresponding period of time under a certain pressure and temperature is held in the furnace in the straightening press 33. Subsequently the material is removed from the tempering furnace 30 and can still in warm state cooling presses 40 are fed, which are in in the immediate vicinity of the outlet of the starting furnace 30 and cool the goods in a defined manner.
  • the device according to the invention is one by continuous rolling conveyor provided in both furnaces, so that the Device except for the pressing and straightening processes works continuously.
  • Example of production data with a device according to the invention Material 1.2003, 75 Cr1 - ⁇ 420 mm x 3.2 mm Preheating in the hardening roller furnace 10 940 ° C, 500 sec. Austenitizing in the hardening roller furnace 930 ° C, 180 sec. Quenching under the hardness press 20 70 sec, hardness 65 HRC Preheating in the starter roller furnace 30 530 ° C, 500 sec. Keep at temperature and press 550 ° C, 270 sec. Cooling under the cooling press 40 70 sec. Hardness 44 HRC

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  • 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 Articles (AREA)
  • Forging (AREA)
  • Tunnel Furnaces (AREA)

Abstract

The assembly to quench and temper metallic materials, especially to temper tool steel, has a continuous roller furnace as the temper furnace. It has a preheating zone (31) and a zone (32) where the temp. is maintained. Cooling presses (40) are at the outlet of the roller furnace (30) for temp. controlled cooling of the material.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Vergüten von metallischem Gut, insbesondere zum Anlassen von Werkzeugstählen nach dem Härten, aufweisend einen Ofen zum Austenitisieren des Gutes, eine Härtepresse für das noch heiße Gut, einen Anlassofen zwecks Einstellung der Härte und des Gefüges des Gutes und eine das Gut durch die Öfen fördernde Einrichtung.The invention relates to a device for tempering of metallic goods, especially for starting Tool steels after hardening, comprising an oven for Austenitizing the goods, a hardness press for the still hot Well, a tempering furnace to adjust the hardness and the Structure of the good and a promoting the good through the ovens Facility.

Eine derartige Vorrichtung ist bekannt (Patent Abstract of Japan vol. 008, no. 251 (C-252), 16. November 1984, & JP-A-59 129718 (SANKIYOU SEIKI SEISAKUSHO: KK), 26. JULI 1984).Such a device is known (Patent Abstract of Japan vol. 008, no. 251 (C-252), November 16, 1984, & JP-A-59 129718 (SANKIYOU SEIKI SEISAKUSHO: KK), JULY 26, 1984).

Bei dieser bekannten Vorrichtung wird eine umlaufende Fördereinrichtung eingesetzt, was dazu führt, dass die Vorrichtung nur für ganz bestimmte Verhältnisse einsetzbar ist, da die Parameter des Härtevorganges und die des Anlassvorganges nicht unabhängig voneinander geändert werden können.In this known device, a rotating Conveyor used, which leads to the fact that Device can only be used for very specific conditions is because the parameters of the hardening process and those of the Starting process can not be changed independently can.

Eine Vorrichtung zum Vergüten von metallischem Gut, insbesondere zum Anlassen von Werkzeugstählen, aufweisend einen Ofen zum Austenitisieren des Gutes, eine Härtepresse für das noch heiße Gut sowie einen Anlassofen zwecks Einstellung der Härte und des Gefüges des Gutes ist bekannt: ("Wärmebehandlung der Bau- und Werkzeugstähle", 3. Aufl., Herausgeber Hans Bennighoff, Sigma Fachbuchreihe 1978, S. 444 bis 451 und Ruhfus, "Wärmebehandlung der Eisenwerkstoffe", Verlag Stahl, Eisen mbH, 1958, S. 380 bis 383 und 386).A device for tempering metallic goods, in particular for tempering tool steels, comprising an oven to austenitize the goods, a hardness press for that hot goods and a tempering furnace to adjust the hardness and the structure of the good is known: ("Heat treatment of the Structural and Tool Steels ", 3rd ed., Publisher Hans Bennighoff, Sigma Book series 1978, pp. 444 to 451 and Ruhfus, "Heat Treatment of Ferrous Materials", Verlag Stahl, Eisen mbH, 1958, pp. 380 to 383 and 386).

Üblicherweise werden lufthärtende Stähle sowie Werkzeugstähle nach dem Härtevorgang wieder angelassen. Die Anlasstemperatur wird nach gewünschter Endhärte ausgewählt. Das Anlassen dient einerseits dem Einstellen der exakten Härte und des gewünschten Gefüges und andererseits auch als Richtprozeß. Bei bekannten Verfahren werden daher die einzelnen Teile in Stapeln zwischen 10 bis 100 Stück miteinander verspannt und anschließend zwischen drei bis zehn Stunden angelassen.Air-hardening steels and tool steels are usually used tempered again after the hardening process. The tempering temperature is selected according to the desired final hardness. Starting serves on the one hand, setting the exact hardness and desired structure and on the other hand as a straightening process. at known methods are therefore the individual parts in Stacked between 10 to 100 pieces clamped together then left on for between three and ten hours.

Es hat sich hierbei gezeigt, dass bei einem derartigen Vergütungsvorgang eine Reihe von Hilfstätigkeiten durchgeführt werden müssen, die zeitraubend sind. Hierzu gehört vor allen Dingen das Verspannen der einzelnen Teile und das spätere Entnehmen aus dem Stapel. Auch ist ein Anlassvorgang im Bereich von mehreren Stunden aus zeitlichen Gründen nicht erwünscht.It has been shown that with such Compensation process carried out a number of auxiliary activities need to be time consuming. This includes above all Thing the bracing of the individual parts and the later Remove from the stack. Also a starting process is in the Range of several hours due to time constraints he wishes.

Die Erfindung will insbesondere diese Nachteile beseitigen und schlägt daher ausgehend von einer Vorrichtung der eingangs genannten Art vor, dass das am Ausgang des Anlassofens Kühlpressen angeordnet sind zwecks temperaturgesteuerter Abkühlung des Gutes, im Inneren des Anlassofens Richtpressen angeordnet sind, um das Gut für eine bestimmte Zeitspanne unter einem bestimmten Druck und einer bestimmten Temperatur zu halten, dass die das Gut durch die Öfen fördernde Einrichtung als Rollenbahn so ausgebildet ist, dass die Vorrichtung bis auf die Press- und Richtvorgänge kontinuierlich arbeitet und dass das Gut nach dem Verlassen des Anlassofens oder nach Verlassen der Kühlpressen entweder einer weiteren Bearbeitung oder aber erneut zum Einlass des Anlassofens zurückgeführt wird.In particular, the invention aims to eliminate these disadvantages and beats starting from a device of the beginning mentioned type before that at the exit of the tempering furnace Cooling presses are arranged for the purpose of temperature control Cooling of the goods, straightening presses inside the tempering furnace are arranged to the good for a certain period of time under a certain pressure and temperature to keep the goods conveying through the ovens Device is designed as a roller conveyor so that the Device except for the pressing and straightening processes works continuously and that the good after leaving of the tempering furnace or after leaving the cooling presses either a further processing or again to the admission of the Tempering furnace is returned.

Es ist zu erkennen, dass bei der Vorrichtung gemäß der vorliegenden Erfindung einerseits die Anlasszeiten auf einige Minuten herabgesetzt werden können und andererseits jedes einzelne Stück für sich ausgerichtet werden kann, ohne dass dies zu zusätzlichen Arbeitsvorgängen führt. Man kann im Vergleich mit den Ergebnissen bekannter Verfahren mit Hilfe der Vorrichtung gemäß der Erfindung zu den gleichen Härtewerten gelangen und darüber hinaus wesentlich besser ausgerichtete Teile zur Verfügung stellen.It can be seen that in the device according to the present invention on the one hand the starting times on some Minutes can be reduced and each other individual piece can be aligned for yourself without that this leads to additional work processes. You can in Comparison with the results of known methods with the help the device according to the invention to the same Hardness values and much better provide aligned parts.

Es liegt im Rahmen der Erfindung, das alleinige Anlassen ohne Härteofen und ohne Härtepresse durchzuführen. Auch können erfindungsgemäß Werkstücke sowohl vergütet als auch nur angelassen werden.It is within the scope of the invention to start alone without Carry out hardening furnace and without hardening press. Can too Workpieces according to the invention are both tempered and only be started.

Die Erfindung wird nachstehend an Hand der Zeichnung beispielsweise erläutert.The invention is described below with reference to the drawing, for example explained.

Die einzige Figur der Zeichnung zeigt eine schematische Längsquerschnittsansicht einer Vergütungsmaschine gemäß der vorliegenden Erfindung.The only figure in the drawing shows a schematic Longitudinal cross-sectional view of a tempering machine according to the present invention.

In der Figur ist mit 10 der eigentliche Härteofen bezeichnet, er hat einen Eingabebereich 11 und eine Vorwärmzone 12 und einen Austenitisierungsbereich 13. Nach Verlassen des Ofens 10 gelangt das Gut zu der Härtepresse 20, die diskontinuierlich arbeitet. In dieser Presse wird das Gut langsam und gezielt abgekühlt und gleichzeitig gerichtet.The actual hardening furnace is designated by 10 in the figure, it has an input area 11 and a preheating zone 12 and an austenitizing area 13. After leaving the furnace 10 the good reaches the hardness press 20, the works discontinuously. In this press is the good slowly and deliberately cooled and straightened at the same time.

Von der Härtepresse gelangt das Gut zum Einlauf 34 eines Anlaßofens 30. Der Anlaßofen 30 hat eine Vorwärmstufe 31 sowie eine Temperaturhaltestufe 32 und ist darüber hinaus noch in seinem Ofeninnenraum mit Richtpressen 33 ausgestattet. Dies bedeutet, daß das Gut, nachdem es die Haltestufe passiert hat, für eine entsprechende Zeitspanne unter einem bestimmten Druck und einer bestimmten Temperatur in der Richtpresse 33 im Ofen gehalten wird. Anschließend wird das Material dem Anlaßofen 30 entnommen und kann in noch warmem Zustand Kühlpressen 40 zugeführt werden, die sich in unmittelbarer Nähe des Auslasses des Anlaßofens 30 befinden und das Gut in definierter Weise abkühlen.The material reaches the inlet 34 of the hardening press Tempering furnace 30. Tempering furnace 30 has a preheating stage 31 as well as a temperature maintenance level 32 and beyond still equipped with straightening presses 33 in his furnace interior. This means that the good after it is the Holding stage has happened for a corresponding period of time under a certain pressure and temperature is held in the furnace in the straightening press 33. Subsequently the material is removed from the tempering furnace 30 and can still in warm state cooling presses 40 are fed, which are in in the immediate vicinity of the outlet of the starting furnace 30 and cool the goods in a defined manner.

Bei der Vorrichtung gemäß der Erfindung ist eine durch die beiden Öfen durchlaufende Rollenbahn vorgesehen, so daß die Vorrichtung bis auf die Preß- und Richtvorgänge kontinuierlich arbeitet.In the device according to the invention is one by continuous rolling conveyor provided in both furnaces, so that the Device except for the pressing and straightening processes works continuously.

Es besteht die Möglichkeit, das Material nach dem Verlassen der Kühlpressen 40 der weiteren Bearbeitung zuzuführen oder noch einmal erneut zum Einlaß 34 des Ofens 30 zurückzuführen, so daß ein weiterer Anlaßvorgang durchgeführt werden kann. Es ist weiterhin möglich, das Gut, wenn es den Ofen 30 verläßt, direkt zum Einlaß 34 des Ofens zurückzuführen, anstatt es zu den Kühlpressen 40 zu geben. There is a possibility of leaving the material after leaving the cooling presses 40 for further processing or again to the inlet 34 of the furnace 30 attributed so that another starting process is carried out can be. It is still possible to get the good if it leaves the furnace 30, directly to the inlet 34 of the furnace attributed instead of giving it to the cooling presses 40.

Beispiel für Produktionsdaten mit einer Vorrichtung gemäß der Erfindung Werkstoff 1.2003, 75 Cr1 - ⊘ 420 mm x 3,2 mm Vorwärmen im Härterollenofen 10 940°C, 500 sec. Austenitisieren im Härterollenofen 930°C, 180 sec. Abschrecken unter der Härtepresse 20    70 sec, Härte 65 HRC Vorwärmen im Anlaßrollenofen 30 530°C, 500 sec. Auf Temperatur halten und Pressen 550°C, 270 sec. Abkühlen unter der Kühlpresse 40    70 sec. Härte 44 HRC Example of production data with a device according to the invention Material 1.2003, 75 Cr1 - ⊘ 420 mm x 3.2 mm Preheating in the hardening roller furnace 10 940 ° C, 500 sec. Austenitizing in the hardening roller furnace 930 ° C, 180 sec. Quenching under the hardness press 20 70 sec, hardness 65 HRC Preheating in the starter roller furnace 30 530 ° C, 500 sec. Keep at temperature and press 550 ° C, 270 sec. Cooling under the cooling press 40 70 sec. Hardness 44 HRC

Claims (1)

  1. Equipment for the heat treatment of metallic materials, in particular for the tempering of tool steels after hardening, comprising a furnace (10) for austenitising the material, a hardening press (20) for the still hot material, a tempering furnace (30) for the purpose of adjusting the hardness and structure of the material, and a conveyor for moving the material through the furnaces (10,30),
    characterised in that
    at the outlet of the tempering furnace (30) cooling presses (40) are arranged for the purpose of cooling the material in a temperature-controlled way; inside the tempering furnace (30) rectifying presses (33) are arranged for holding the material for a given time period under a given pressure at a given temperature; the conveyor that moves the material through the furnaces (10, 30) is constructed as a roller track such that the equipment operates continuously up to the pressing and rectifying stages, and after leaving the tempering furnace (30) or after leaving the cooling presses (40), the material is either passed on for further processing or returned back again to the inlet (34) of the tempering furnace (30).
EP96110951A 1995-07-12 1996-07-06 Plant for hardening and tempering metallic articles Expired - Lifetime EP0753587B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19525342A DE19525342C1 (en) 1995-07-12 1995-07-12 Device for tempering metallic material
DE19525342 1995-07-12

Publications (2)

Publication Number Publication Date
EP0753587A1 EP0753587A1 (en) 1997-01-15
EP0753587B1 true EP0753587B1 (en) 2002-05-08

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EP96110951A Expired - Lifetime EP0753587B1 (en) 1995-07-12 1996-07-06 Plant for hardening and tempering metallic articles

Country Status (3)

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EP (1) EP0753587B1 (en)
AT (1) ATE217355T1 (en)
DE (2) DE19525342C1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008036237B3 (en) * 2008-08-02 2010-01-28 GMT Gesellschaft für metallurgische Technologie- und Softwareentwicklung mbH Method and plant for inline forming, tempering and straightening rod-shaped metal parts
DE102016219761A1 (en) * 2016-10-11 2018-04-12 Volkswagen Aktiengesellschaft Method for producing a hot-formed part

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19840094C2 (en) * 1998-09-03 2002-09-19 Waermetechnik Heimsoth Gmbh & Use of copper alloys for cooling press plates in facilities for the heat treatment of steel parts
SE517224C2 (en) * 2000-09-18 2002-05-14 J Son Haerdteknik Ab Methods and apparatus for pressing hardening
FR2827874B1 (en) * 2001-07-27 2004-05-21 Usinor PROCESS FOR MANUFACTURING VERY HIGH MECHANICAL STRENGTH AND EXCELLENT PLANEITY STEEL PARTS
CN110527814A (en) * 2019-10-12 2019-12-03 大连汇程铝业有限公司 A kind of aluminum alloy pre-stretching cut deal roller-bottom type glowing furnace control method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE412608C (en) * 1922-09-03 1925-05-28 Koll & Cie G M B H Process for tempering and straightening (tensioning) saw blades, planer knives and similar tools
DE887051C (en) * 1944-06-25 1953-08-20 Siemens Ag Device for tempering thin sheets
JPS59129718A (en) * 1983-01-14 1984-07-26 Sankyo Seiki Mfg Co Ltd Continuous press hardening and transferring device
DE4018566C2 (en) * 1990-06-09 1997-04-24 Nold Ernst Dr Process for changing the shape of tempering, case hardening or precipitation hardening materials
DE4316795A1 (en) * 1993-05-19 1994-11-24 Heimsoth Verwaltungen Process for the thermal pretreatment of metallic material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008036237B3 (en) * 2008-08-02 2010-01-28 GMT Gesellschaft für metallurgische Technologie- und Softwareentwicklung mbH Method and plant for inline forming, tempering and straightening rod-shaped metal parts
EP2157194A1 (en) 2008-08-02 2010-02-24 GMT-Gesellschaft für Metallurgische Technologie- und Softwareentwicklung mbH Method and assembly for inline reforming, treatment and alignment of rod-shaped metal parts
DE102016219761A1 (en) * 2016-10-11 2018-04-12 Volkswagen Aktiengesellschaft Method for producing a hot-formed part

Also Published As

Publication number Publication date
EP0753587A1 (en) 1997-01-15
DE19525342C1 (en) 1997-03-20
ATE217355T1 (en) 2002-05-15
DE59609179D1 (en) 2002-06-13

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