EP3144620A1 - Wärmebehandlungsanlage - Google Patents

Wärmebehandlungsanlage Download PDF

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Publication number
EP3144620A1
EP3144620A1 EP15185974.1A EP15185974A EP3144620A1 EP 3144620 A1 EP3144620 A1 EP 3144620A1 EP 15185974 A EP15185974 A EP 15185974A EP 3144620 A1 EP3144620 A1 EP 3144620A1
Authority
EP
European Patent Office
Prior art keywords
width
region
heat treatment
treatment plant
heat
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Withdrawn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
EP15185974.1A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jörg Winkel
Frank WILDEN
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.)
Schwartz GmbH
Original Assignee
Schwartz 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 Schwartz GmbH filed Critical Schwartz GmbH
Priority to EP15185974.1A priority Critical patent/EP3144620A1/de
Priority to PCT/EP2016/071450 priority patent/WO2017046033A1/de
Priority to CN201680054438.5A priority patent/CN108139160A/zh
Priority to EP16774874.8A priority patent/EP3350528A1/de
Priority to MX2018003302A priority patent/MX2018003302A/es
Priority to US15/759,875 priority patent/US20180258506A1/en
Publication of EP3144620A1 publication Critical patent/EP3144620A1/de
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)
    • 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
    • F27D5/00—Supports, screens, or the like for the charge within the furnace

Definitions

  • the invention relates to a heat treatment plant, in particular a roller hearth furnace.
  • the goal is to develop vehicles with the lowest possible fuel consumption.
  • a common means of reducing fuel consumption is, for example, in the reduction of vehicle weight.
  • the body steels used have a higher strength at a lower weight. This is usually achieved by the process of so-called press-hardening.
  • a sheet metal part is heated to about 800 - 1000 ° C and then deformed in a cooled tool and quenched. The strength of the component thereby increases up to about three times.
  • a board is punched out of a coil, cold-formed and fed the thus preformed component of the heat treatment. After the heat treatment, the hot component is press fed into the press in an indirectly cooled tool. Subsequently, the components are trimmed again and sandblasted to remove any existing scaling.
  • a board is also punched out of a coil, however, there is no pre-deformation, but the board is fed directly to the furnace after the heat treatment in the hot state.
  • the hot board is deformed and simultaneously press-hardened by the cooling in the cooled tool. Subsequently, the molded components are trimmed again if necessary.
  • roller hearth furnaces are continuous furnaces in which the components to be treated are conveyed either directly or by means of goods carriers on rollers through the furnace. The rollers are usually driven.
  • continuous furnaces for this process can be equipped with inlet and outlet locks. To avoid scaling of the component surface, such a furnace can be operated with inert gas.
  • the inlet and outlet locks are used to prevent the entry of air into the oven, which usually takes place rinsing or replacement of the atmosphere in the locks. Furthermore, the locks reduce the escape of furnace atmosphere into the environment and thus also reduce the heat loss to the environment.
  • Continuous furnaces for this process must be equipped with a product carrier return conveyor system to ensure the circulation of product carriers. In the furnaces, for example, ceramic conveyor rollers are used. Only the infeed and outfeed tables and the goods carrier return conveyor are equipped with metallic conveyor rollers in this case. Depending on the application but also conveyor rollers made of other materials are possible.
  • the use of goods carriers can be omitted. Therefore, the construction is somewhat simpler than that of the furnaces for the indirect process.
  • the boards can be placed directly on ceramic conveyor rollers in the direct process and be conveyed through the oven.
  • These ovens can be operated with and without inert gas. Again, the oven housing is designed as standard gas-tight.
  • Another advantage of this type is the positive effect of the conveyor roller on the uniform heating of the metal parts to be treated to see: heated by the furnace heating with stationary rollers heated by radiation and heat conduction transported on them and therefore in contact with them in contact metal part ,
  • these ovens are operated with a significantly lower energy consumption, since there are no goods carriers that can cool down on the return transport after the oven flow and must therefore be reheated in the oven in a new run again.
  • the direct method is therefore preferably used with the use of continuous furnaces.
  • the plates used in vehicle construction should not rust as much as possible. Also, scaling should be avoided during the machining process, since such scaling for further processing, at the latest before the welding or painting process, must be removed consuming and costly.
  • untreated steel sheets would inevitably scale up under the high temperatures required in press-hardening in the presence of oxygen, it is common to use coated sheets and / or to carry out the heat treatment process in the absence of oxygen.
  • AlSi aluminum-silicon
  • the ovens can be heated in different ways.
  • the heating is usually with burners, which are operated with fossil materials, such as gas. But other types of heating such as electric radiant heaters are possible.
  • roller hearth furnaces therefore have a maximum internal width of about 2 , 70 m up, ie a component to be heat treated in this roller hearth furnace may not have more than about 2,500 mm in one direction, the widthwise direction.
  • the object of the invention is therefore to provide a heat treatment plant for the heat treatment of metallic components with a larger useful width.
  • the heat treatment plant according to the invention has rollers for the passage of a heat-treated component through the heat treatment plant.
  • the component can have a steel material, for example 22MnB5, and be coated or uncoated. Suitable coatings include, for example, aluminum-silicon (AlSi) coatings, zinc alloy coatings, for example zinc-nickel coatings or a scale protection paint.
  • AlSi aluminum-silicon
  • the heat treatment plant according to the invention has a work space with a first region having a width B1 and a second region having a width B2, wherein in the first region, the rollers are arranged and wherein the width B2 is greater than the width B1. Width is understood here and below the dimension transverse to the direction of the furnace.
  • the width B1 is dimensioned such that the rollers have a length at which they even at a temperature prevailing in the oven for the heat treatment of metallic components such have mechanical stability that, for example, their deflection remains in the loaded state within reasonable tolerances.
  • the second region of the useful space extends with a greater width B2, so that components with a maximum width B2 greater than B1 can also be heat-treated.
  • the first area with the rollers is thus arranged in the lower region of the work space, so that a component can be transported directly or on a goods carrier on at least one role lying by the heat treatment plant.
  • the heat treatment plant according to the invention has a graded useful chamber width, so that on the one hand the criterion of limited due to the mechanical strength roll length, on the other hand, the criterion of heat-treatability of a wider component is met.
  • the heat treatment system further comprises a product carrier, wherein the product carrier has a first and a second region having a width W1 and a third region having a width W2, the width W1 being smaller than the width B1 of the first region of the useful space and the width W2 is smaller than the width B2 of the second region of the work space, and wherein the product support is in contact with at least one of the rollers with its first region.
  • the product carrier has a likewise graduated profile, with components that are wider than the width B1 of the first usable-space region being receivable with the second, wider region of the product carrier.
  • the second region of the goods carrier serves as height compensation and the third region of the goods carrier is designed as a support of the component.
  • the word height compensation here means balancing the different distances of the working level of the heat treatment plant, ie the level of the upper peripheral lines of the rollers, and the level in which widened the useful space, for example, a hall floor on which the heat treatment plant is placed.
  • the useful space of the heat treatment plant widened in its second area relative to the first area, wherein the second area is arranged above the first area.
  • the third Area of the goods carrier which comes in contact with the component during operation, contains a ceramic material.
  • the first area of the goods carrier is in operation of the heat treatment plant on at least one role.
  • the heat treatment plant has at least one heat source in the first region and at least one further heat source in the second region of the useful space.
  • the at least one heat source arranged in the first region of the useful space can be arranged below the rollers, for example.
  • gas burners with flame tubes are provided as heat sources.
  • Gas burners are characterized by their energy efficiency.
  • a gas infrastructure is usually present in the production facilities for the heat treatment of metallic components. All other heat sources, such as radiant electric heat sources are also possible.
  • a plurality of heat sources are arranged in the second region of the work space, wherein the plurality of heat sources are arranged one behind the other in the oven flow direction and protrude alternately from the lateral boundaries of the work space into the second region of the work space.
  • burners for fossil fuels in flame tubes in which the flame burns.
  • the flame tubes may have a shorter length, so that bending or one-sided bending effects do not reach a critical magnitude, and nevertheless allow component heating to be sufficiently homogeneous over the width of the component.
  • At least at least one roller has a ceramic material.
  • all roles have a ceramic material in the working space and only the rollers in the inlet and outlet zones, in which lower temperatures prevail in furnace operation as in the furnace, made of other materials, such as a steel material exist. If the rollers have a ceramic material, they can be more heat-resistant than steel rollers.
  • the heat treatment plant has an inlet and an outlet lock.
  • the furnace operation is also possible for highly curved in the space preforms for the indirect process with inert gas without escaping gas to a significant extent in the ambient atmosphere.
  • inert gas escaping into the ambient atmosphere could have harmful health consequences for any operating personnel exposed to the ambient atmosphere; on the other hand, the usual protective gases are relatively expensive, so that the escape of protective gas from the heat treatment plant would have negative economic consequences.
  • the furnace atmosphere may also contain dried air, the escape of which would also have at least a negative economic effect.
  • locks can minimize the heat loss of the heat treatment plant. If, on the other hand, the heat treatment plant is to be operated for flat blanks or preforms, for example with an air atmosphere, the locks do not interfere.
  • the heat treatment plant according to the invention is suitable for processing boards on goods carriers in direct process, which are treated in the second, wider area of the work space.
  • the heat treatment plant is also suitable for treating preforms on goods carriers in the indirect process in the second, wider area of the work space with heat.
  • both boards can be processed on goods carriers in direct or preformed on goods carriers in the indirect process.
  • the boards or pre-molded parts do not extend beyond the width B1 of the first usable space area, they can be processed in the second, wide area of the work space or also in the first, narrower area of the work space.
  • an alternative goods carrier in which at least the second area for height compensation is missing or very short, must be used.
  • This may have a third region for supporting the component, for example of a ceramic material, in which case this third region has a width which is smaller than the width of the first region of the usable space B1. In this case, however, the components can also be placed directly on the first area of the goods carrier.
  • the heat treatment system according to the invention can also be used to hang boards without goods carrier in the first area of the usable space directly on the rollers and to process in a direct process.
  • Fig. 1 a cross section through a heat treatment system 100 according to the invention is shown.
  • the heat treatment plant 100 has rollers 101 for the passage of a heat-treatment component 150 through the heat treatment plant 100.
  • the heat treatment system 100 has a work space 110 with a first area 111 having a width B1 and a second area 112 having a width B2, wherein the rollers 101 are arranged in the first area 111 and the width B2 is greater than the width B1 ,
  • the width B1 may be 2,500 mm, while the width B2 may be 3,500 mm, for example.
  • the heat treatment system 100 further comprises a product carrier 120, wherein the product carrier 120 has a first region 121 and a second region 122 having a width W1 and a third region 123 a width W2, wherein the width W1 is smaller than the width B1 of the first area 111 of the work space 110 and the width W2 is smaller than the width B2 of the second area 112 of the work space 110 and wherein the goods carrier 120 with its first portion 121 in contact with at least one of the rollers 101 stands.
  • the second area 122 is used for height compensation and the third area 123 of the support of the component 150. Overall, the heights of the three areas 121, 122, 123 add to the height of the goods carrier HW, which may be 420 mm, for example.
  • the product carrier 120 On the third area 123 of the product carrier 120 is a preform part as a component 150, which has, for example, a thickness HB of, for example, 200 mm.
  • the product carrier 120 has a first region 121, with which the product carrier 120 is in contact with at least one roller 101, a second region 122 for height compensation and a third region 123 for supporting the component 150.
  • the heat treatment plant 100 has a working height AH, for example 1150 mm.
  • the height of the upper circumferential line of the rollers 101 is understood as the working height, ie the height at which the goods carriers 120 or the components 150 run through the heat treatment system 100 during operation without goods carriers 120, measured from a base, for example a hall floor, on the the heat treatment plant 100 is set up.
  • the heat treatment plant 100 has heat sources 102 in the form of gas burners with flame tubes in the first region 111 as well as in the second region 112 of the work space 110.
  • heat sources 102 in the form of gas burners with flame tubes in the first region 111 as well as in the second region 112 of the work space 110.
  • the gas burners in the second region 112 of the work space 110 are arranged one behind the other in the direction of the passage of the oven and protrude alternately from the lateral boundaries 115 of the work space into the second region of the work space 110.
  • the heat treatment system 100 has a stepped usable space width B1, B2.
  • the heat treatment plant 100 is suitable for processing components 150 in the form of boards on goods carriers 120 in the direct process, which are treated in the second, wider area 112 of the work space 110.
  • the heat treatment plant 100 is also suitable for producing components 150 in the form of preforms on product carriers 120 in the indirect process in the second, wider To treat area 112 of the work space 110 with heat.
  • components 150 in the form of blanks as well as in the form of preforms which have a width which does not extend beyond the width B1 of the first usable space 111 can be placed on goods carriers 120 in the second, wide region 112 of the work space 110 or also in the first, narrower region 111 of the work space 110 are processed. If the components 150 are to be processed in the first region 111, an alternative product carrier 120, in which at least the second region 122 for height compensation is missing or has only a very short design, must be used. This may have a third region 123 for supporting the component 150, for example of a ceramic material, in which case this third region 123 has a width which is smaller than the width B1 of the first region 111 of the work space 110. In this case, however, the components 150 can also be placed directly on the first region 121 of the goods carrier 120.
  • the heat treatment system 100 can also be used to place components 150 in the form of circuit boards without product carrier 120 in the first region 111 of the work space 110 directly on the rollers 101 and process them in the direct process.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Tunnel Furnaces (AREA)
EP15185974.1A 2015-09-18 2015-09-18 Wärmebehandlungsanlage Withdrawn EP3144620A1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP15185974.1A EP3144620A1 (de) 2015-09-18 2015-09-18 Wärmebehandlungsanlage
PCT/EP2016/071450 WO2017046033A1 (de) 2015-09-18 2016-09-12 Wärmebehandlungsanlage
CN201680054438.5A CN108139160A (zh) 2015-09-18 2016-09-12 热处理系统
EP16774874.8A EP3350528A1 (de) 2015-09-18 2016-09-12 Wärmebehandlungsanlage
MX2018003302A MX2018003302A (es) 2015-09-18 2016-09-12 Instalacion de tratamiento termico.
US15/759,875 US20180258506A1 (en) 2015-09-18 2016-09-12 Heat treatment system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15185974.1A EP3144620A1 (de) 2015-09-18 2015-09-18 Wärmebehandlungsanlage

Publications (1)

Publication Number Publication Date
EP3144620A1 true EP3144620A1 (de) 2017-03-22

Family

ID=54330578

Family Applications (2)

Application Number Title Priority Date Filing Date
EP15185974.1A Withdrawn EP3144620A1 (de) 2015-09-18 2015-09-18 Wärmebehandlungsanlage
EP16774874.8A Withdrawn EP3350528A1 (de) 2015-09-18 2016-09-12 Wärmebehandlungsanlage

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP16774874.8A Withdrawn EP3350528A1 (de) 2015-09-18 2016-09-12 Wärmebehandlungsanlage

Country Status (5)

Country Link
US (1) US20180258506A1 (es)
EP (2) EP3144620A1 (es)
CN (1) CN108139160A (es)
MX (1) MX2018003302A (es)
WO (1) WO2017046033A1 (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107058716A (zh) * 2017-04-01 2017-08-18 天龙科技炉业(无锡)有限公司 转毂式炉热处理自动生产线
DE102017120128A1 (de) * 2017-09-01 2019-03-07 Schwartz Gmbh Verfahren zum Erwärmen eines metallischen Bauteils auf eine Zieltemperatur und entsprechender Rollenherdofen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1498125A (en) * 1922-04-05 1924-06-17 Gleason Works Furnace
EP0767353A1 (en) * 1995-09-13 1997-04-09 DANIELI & C. OFFICINE MECCANICHE S.p.A. Method to equalise the temperature in a heating furnace with a controlled-oxidisation ambient and heating furnace carrying out the method
DE102011006171A1 (de) 2011-03-25 2012-09-27 Eva Schwartz Rollenherdofen und Verfahren zum Erwärmen von Werkstücken

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US387844A (en) * 1888-08-14 Regenerative gas-burner
GB295955A (en) * 1927-02-21 1928-08-21 Taine Gilbert Mcdougal Improvements relating to the heat treatment of ceramic articles
DE2236231A1 (de) * 1972-07-24 1974-02-14 Heinz Behrens Mit gasfoermigen oder zerstaeubten fluessigen oder vergasten brennstoffen beheizter tunnelofen, insbesondere fuer die keramische industrie
US4013402A (en) * 1975-06-11 1977-03-22 Foster Wheeler Energy Corporation Fired heater for a multiphase feedstock
US4013403A (en) * 1975-12-08 1977-03-22 Pullman Incorporated Support means for a roller hearth in a kiln
DE3025801C2 (de) * 1980-07-08 1982-10-28 Ludwig Riedhammer GmbH & Co KG, 8500 Nürnberg Tunnelofen zum Brennen von keramischen Werkstücken
DE3319396C2 (de) * 1983-05-28 1985-04-04 VGT AG, 3432 Großalmerode Ofenanlage mit einem Ofen und einer Fördereinrichtung
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CN1152483A (zh) * 1995-09-13 1997-06-25 丹尼利机械厂联合股票公司 均衡含受控氧化环境加热炉温度的方法及实施它的加热炉
JP2007231328A (ja) * 2006-02-28 2007-09-13 Jfe Steel Kk 金属材の加熱方法及び直火加熱炉
DE102006020781B3 (de) * 2006-05-03 2007-11-22 Benteler Automobiltechnik Gmbh Ofen
DE102007044783A1 (de) * 2007-09-19 2009-04-09 Audi Ag Verfahren und Vorrichtung zur Silicierung von kohlenstoffhaltigen Werkstoffen
CN104017983A (zh) * 2014-06-05 2014-09-03 河北钢铁股份有限公司唐山分公司 一种长寿命的加热炉钢坯输送辊道

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1498125A (en) * 1922-04-05 1924-06-17 Gleason Works Furnace
EP0767353A1 (en) * 1995-09-13 1997-04-09 DANIELI & C. OFFICINE MECCANICHE S.p.A. Method to equalise the temperature in a heating furnace with a controlled-oxidisation ambient and heating furnace carrying out the method
DE102011006171A1 (de) 2011-03-25 2012-09-27 Eva Schwartz Rollenherdofen und Verfahren zum Erwärmen von Werkstücken

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107058716A (zh) * 2017-04-01 2017-08-18 天龙科技炉业(无锡)有限公司 转毂式炉热处理自动生产线
CN107058716B (zh) * 2017-04-01 2018-08-10 天龙科技炉业(无锡)有限公司 转毂式炉热处理自动生产线
DE102017120128A1 (de) * 2017-09-01 2019-03-07 Schwartz Gmbh Verfahren zum Erwärmen eines metallischen Bauteils auf eine Zieltemperatur und entsprechender Rollenherdofen
US11584972B2 (en) 2017-09-01 2023-02-21 Schwartz Gmbh Method for heating a metal component to a target temperature and corresponding roller hearth furnace

Also Published As

Publication number Publication date
CN108139160A (zh) 2018-06-08
WO2017046033A1 (de) 2017-03-23
EP3350528A1 (de) 2018-07-25
MX2018003302A (es) 2019-02-07
US20180258506A1 (en) 2018-09-13

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