EP0162013A2 - Four de réchauffage pour des produits cylindriques - Google Patents

Four de réchauffage pour des produits cylindriques Download PDF

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Publication number
EP0162013A2
EP0162013A2 EP85810216A EP85810216A EP0162013A2 EP 0162013 A2 EP0162013 A2 EP 0162013A2 EP 85810216 A EP85810216 A EP 85810216A EP 85810216 A EP85810216 A EP 85810216A EP 0162013 A2 EP0162013 A2 EP 0162013A2
Authority
EP
European Patent Office
Prior art keywords
heating furnace
goods
furnace according
treatment room
charge
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
EP85810216A
Other languages
German (de)
English (en)
Other versions
EP0162013A3 (en
EP0162013B1 (fr
Inventor
Bernhard Hilge
Martin Knoch
Carl Kramer
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.)
Alcan Holdings Switzerland AG
Original Assignee
Alusuisse Holdings AG
Schweizerische Aluminium AG
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 Alusuisse Holdings AG, Schweizerische Aluminium AG filed Critical Alusuisse Holdings AG
Priority to AT85810216T priority Critical patent/ATE46965T1/de
Publication of EP0162013A2 publication Critical patent/EP0162013A2/fr
Publication of EP0162013A3 publication Critical patent/EP0162013A3/de
Application granted granted Critical
Publication of EP0162013B1 publication Critical patent/EP0162013B1/fr
Expired 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
    • C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
    • 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

Definitions

  • the invention relates to a heating furnace for bolts, rods, pipes and similar cylindrical goods of the type specified in the preamble of claim 1.
  • a heating furnace for bolts, rods, pipes and similar cylindrical goods is known, which are conveyed through a treatment room by means of a transport device.
  • this transport device maintains a certain, predetermined height, so that the goods with different diameters, the longitudinal axes are not exactly in the middle of the cylinder treatment room.
  • these curvatures in turn cause an even more uneven heating, since, seen over the length of the annealing material, the distance between the wall of the cylindrical treatment space and the surface of the annealing material changes in an uncontrolled manner.
  • the fans for generating the circulated gas flow are arranged so that the material is not evenly applied to the entire length of the gas flow without additional construction-intensive and pressure-reducing internals, such as baffles; this is due to the one-sided arrangement of the fans.
  • the fans blow off transversely to the longitudinal axis of the material, so that the pressure recovery in the fan housing causes problems.
  • Another disadvantage of this known heating furnace is the use of slot nozzles for convective heating. These slit nozzles arranged along the material produce slit jets, the exit speed of which runs over the material circumference in different directions to the material surface and thus results in an uneven flow application and thus an uneven heating around the product circumference.
  • DE-OS 29 29 322 DE-OS 27 12 279, DE-AS 26 37 646 and DE-OS 23 49 765.
  • DE-OS 29 19 207 shows a transport device for a heating furnace, in which, however, the cylindrical goods are heated by direct contact with heated, refractory blocks, that is to say not by convective heating.
  • a heating furnace of the type specified finally emerges from US Pat. No. 4,065,249 and has a treatment room, the shape of which is adapted to the cross section of the goods, a transport device for conveying the goods in the direction of its longitudinal axis through the treatment room, and a fan for the production of a gas stream, a heater for heating the Gas flow and nozzle openings for the introduction of the heated gas flow in the treatment room.
  • a treatment room the shape of which is adapted to the cross section of the goods
  • a transport device for conveying the goods in the direction of its longitudinal axis through the treatment room
  • a fan for the production of a gas stream
  • a heater for heating the Gas flow and nozzle openings for the introduction of the heated gas flow in the treatment room.
  • the invention is therefore based on the object of providing a heating furnace of the type specified, in which the disadvantages mentioned above do not occur.
  • a heating furnace which leads to a precisely defined, uniform heating of the cylindrical material over its entire length and its entire circumference and excludes curvatures caused by different heating.
  • the advantages achieved by the invention are based in particular on the action of the cylindrical goods by the circulated gas flow in a manner which, even with different diameters of the goods, always leads to a symmetrical distribution of the heat transfer over the surface of the goods and over the length of the goods.
  • the cylindrical goods are on the one hand in each case held at a constant, defined Achsla g e in the Anürmofen;
  • the heat transfer takes place through a nozzle field, the jet of which is exactly radial to the Longitudinal axis of the cylindrical material are directed, which ensures stable, defined heat transfer conditions.
  • the exact radial alignment of the impinging jets is in turn achieved by an appropriate design of the flow guide and the flow channel provided with the nozzle openings.
  • the material to be annealed is indicated schematically in the drawings by a cylindrical bolt 1 which is located in a cylindrical treatment room 2.
  • This bolt 1 is moved horizontally by a conveyor device shown in FIGS. 6 and 7 tion introduced into the treatment room, then centered in the vertical direction in the treatment room by means of a lifting device integrated in the conveying device, held there if necessary for a predetermined period of time, lowered again and then conveyed out of the treatment room 2.
  • the transport direction of the bolts 1 runs horizontally in the longitudinal direction of the central central or longitudinal axis of the bolts 1.
  • the transport device transports the bolts 1 into the treatment room in such a way that the longitudinal axes of all bolts 1, regardless of their diameter, are held at the same height in the treatment room 2.
  • the minimum pin diameter is shown at la and the maximum pin diameter at lb. It can be seen that in both cases the longitudinal axis of the bolts la and lb are in the same place.
  • the outer walls of the treatment room 2 are formed by side walls of supply channels 4 for the treatment gas, for example air, which end in nozzle openings 3 in the walls of the treatment room 2.
  • the nozzle openings are arranged in the walls such that the nozzle jets emerging from the nozzle openings 3 are directed exactly radially onto the bolts 1.
  • the points of incidence of the nozzle jets based on the development of the lateral surface of the cylindrical bolts 1, lie in the corner points of equilateral triangles.
  • the side length of these equilateral triangles corresponds approximately to the distance between the nozzle exit surface and the bolt surface, based on the mean bolt diameter.
  • the outlet diameter of the nozzle openings 3 corresponds approximately to one Fifth of the average nozzle distance from the surface of the studs 1.
  • the fan 6 conveys the treatment gas symmetrically on both sides in outflow diffusers 8.
  • burners At the end of these outflow diffusers 8, that is to say at the points where the outflow diffusers expand to approximately the width of the system, burners are installed, the flame of which is directed against the outflow from the fan 6, whereby the hot exhaust gases mix very evenly with the treatment gas circulated by the fan 6. Burners can be used for all common fuels. With indirect heating, the radiant tubes and with direct electrical heating, the heating grids are also installed in the flow channel at the end of the outflow diffusers. The subsequent narrowing of the flow channel results in an acceleration, which leads to a uniform speed profile in the inlet area 9 of the supply channels 4 for the nozzle openings 3.
  • the transport device will be described below with reference to Figures 6 and 7.
  • the transport device generally indicated by reference numeral 12, consisting of a conveying and lifting device, has a horizontal, stationary transport roller hearth 14, ie the rotatable rollers 14 of this roller hearth maintain their vertical height and serve only for the horizontal conveying of the bolts 1 in and out of the treatment room 2.
  • a lifting device is integrated with a connecting and supporting frame 16, which by lifting elements (not shown), e.g. Spindles or hydraulic cylinders, can be adjusted in the vertical direction.
  • the frame 16 carries a plurality of vertical lifting rods 18 (three rods are shown in FIG. 6), which are provided with horizontal bearing brackets 20 at their upper end.
  • the bearing brackets 20 have bearing surfaces made of a suitable material, for example a ceramic material or a sintered material, for the shafts of double V-rollers 22.
  • the bolt 1 lying on the conveyor rollers 14 is inserted in the horizontal direction into the treatment room 2 until it runs against a stop. Then the bolt 1 is moved back a certain distance against its conveying direction until it has reached the correct horizontal position in the treatment room 2.
  • the lifting elements are then actuated, as a result of which the frame 16 and thus also the double V-rollers 22 are displaced in the vertical direction upwards until the longitudinal axis of the bolt 1 shown in FIG. 6 coincides with the central axis of the treatment room 2.
  • the double V-rollers 22 are evenly distributed over the length of the bolt 1 and consist of a heat-resistant material. Except for the middle double V-roller, all lifting rollers are pivoted. The, based on the length of the pin 1, the middle double V-roller 22 is stationary, however, so it cannot rotate, which means that when the pin is heated, a uniform thermal expansion on both sides of the pin 1 in the longitudinal direction starts from the center Bolt 1 is guaranteed.
  • the lifting devices of the individual treatment rooms 2 can be operated independently of one another, whereby charging of the individual treatment rooms 2 is possible.
  • the jerk tool for example, by corresponding deformation with a D, across the desired beam tilt angle is preferably achieved exactly perpendicular to the axis of the cylindrical pin. 1 In this way, a uniform outflow of the treatment gas from the bolt 1 is also achieved, which in turn leads to a heat transfer evenly distributed over the bolt surface.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Tunnel Furnaces (AREA)
  • General Induction Heating (AREA)
  • Drying Of Solid Materials (AREA)
  • Heat Treatment Of Articles (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Furnace Details (AREA)
EP85810216A 1984-05-18 1985-05-08 Four de réchauffage pour des produits cylindriques Expired EP0162013B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85810216T ATE46965T1 (de) 1984-05-18 1985-05-08 Anwaermofen fuer zylindrische gueter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3418603 1984-05-18
DE3418603A DE3418603C1 (de) 1984-05-18 1984-05-18 Anwaermofen fuer zylindrische Gueter

Publications (3)

Publication Number Publication Date
EP0162013A2 true EP0162013A2 (fr) 1985-11-21
EP0162013A3 EP0162013A3 (en) 1987-04-29
EP0162013B1 EP0162013B1 (fr) 1989-10-04

Family

ID=6236277

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85810216A Expired EP0162013B1 (fr) 1984-05-18 1985-05-08 Four de réchauffage pour des produits cylindriques

Country Status (7)

Country Link
US (1) US4620840A (fr)
EP (1) EP0162013B1 (fr)
JP (1) JPS619514A (fr)
AT (1) ATE46965T1 (fr)
CA (1) CA1233639A (fr)
DE (2) DE3418603C1 (fr)
NO (1) NO166289C (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2199643A (en) * 1987-01-07 1988-07-13 British Gas Plc Heating stock
WO2001020052A2 (fr) * 1999-09-16 2001-03-22 Honsel Profilprodukte Gmbh Procede et dispositif pour le traitement thermique de profiles files
DE102007062551A1 (de) * 2007-12-20 2009-06-25 Otto Junker Gmbh Vorrichtung zur Erwärmung von Metallbolzen

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5007824A (en) * 1987-08-26 1991-04-16 Sidwell Clarence W Skid mark erasure system
US4936771A (en) * 1987-08-26 1990-06-26 Sidwell Clarence W Skid mark erasure system
US5182073A (en) * 1990-11-01 1993-01-26 Plasma Energy Corporation Apparatus for surface treating metal billets
DE19538364C5 (de) * 1995-10-14 2007-05-24 Carl Prof. Dr.-Ing. Kramer Vorrichtung zur Schnellerwärmung von Metall-Preßbolzen
DE19943354C1 (de) * 1999-09-10 2001-05-23 Carl Kramer Vorrichtung zur gleichmäßigen Schnellerwärmung von Pressbolzen oder Stangen, insbesondere aus Leichtmetalllegierungen
WO2016020546A1 (fr) * 2014-08-08 2016-02-11 I.C.M.I. S.R.L. Four de rechauffage pour barres metalliques
CN115823883B (zh) * 2022-12-13 2023-10-13 江苏东方成套设备制造集团有限公司 一种加热炉预处理装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB854359A (en) * 1955-11-04 1960-11-16 Salem Engineering Company Ltd Improvements in, or relating to, furnaces
US3837794A (en) * 1973-07-16 1974-09-24 Granco Equipment Billet heating
FR2450284A1 (fr) * 1979-03-01 1980-09-26 Elhaus Friedrich W Procede et dispositif de traitement thermique continu d'objets metalliques allonges, isoles
WO1983002661A1 (fr) * 1982-02-02 1983-08-04 Friedrich Wilhelm Elhaus Four de prechauffage de materiaux allonges

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1872713A (en) * 1927-08-27 1932-08-23 Frank A Fahrenwald Apparatus for heat treating objects
US1834304A (en) * 1927-12-31 1931-12-01 United Eng Foundry Co Heating furnace
US2697860A (en) * 1951-05-08 1954-12-28 Ferro Eng Co Hot top conditioning equipment
DE2349765A1 (de) * 1973-10-03 1975-04-10 Elhaus Friedrich W Verfahren und einrichtung zur waermebehandlung von zu behandelndem gut, insbesondere aus aluminium- oder magnesiumlegierungen
US3813212A (en) * 1973-04-23 1974-05-28 Phillips Petroleum Co Rotating flame treater
US4184839A (en) * 1975-02-07 1980-01-22 Mannesmann Aktiengesellschaft Roller track for pipes
US3994678A (en) * 1975-05-12 1976-11-30 Oliver Machinery Company Heater for billets
CH610010A5 (en) * 1976-03-22 1979-03-30 Elhaus Friedrich W Arrangement for the heat treatment of elongate stock
DE2628657C2 (de) * 1976-06-25 1984-04-26 Otto Junker Gmbh, 5107 Simmerath Temperatur-Ausgleichsofen für im Durchlaufverfahren zu erwärmende metallische Werkstücke
DE2637646B2 (de) * 1976-08-20 1978-08-10 Friedrich Wilhelm Dipl.- Ing. 5600 Wuppertal Elhaus Anwärmofen
IT1203181B (it) * 1978-05-18 1989-02-15 Olivotto Constr Termomecc Forno continuo per il riscaldo di pezzi metallici cilindrici
DE2929322C2 (de) * 1979-07-19 1984-05-17 Friedrich Wilhelm Dipl.-Ing. 5600 Wuppertal Elhaus Anwärmofen
US4410308A (en) * 1982-01-04 1983-10-18 Mcelroy James G Combustion furnace and burner
US4481398A (en) * 1982-09-13 1984-11-06 Lavins Paul N Multi-directional oscillating breakoff mechanism for separating billets

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB854359A (en) * 1955-11-04 1960-11-16 Salem Engineering Company Ltd Improvements in, or relating to, furnaces
US3837794A (en) * 1973-07-16 1974-09-24 Granco Equipment Billet heating
FR2450284A1 (fr) * 1979-03-01 1980-09-26 Elhaus Friedrich W Procede et dispositif de traitement thermique continu d'objets metalliques allonges, isoles
WO1983002661A1 (fr) * 1982-02-02 1983-08-04 Friedrich Wilhelm Elhaus Four de prechauffage de materiaux allonges

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2199643A (en) * 1987-01-07 1988-07-13 British Gas Plc Heating stock
GB2199643B (en) * 1987-01-07 1990-06-20 British Gas Plc Apparatus for heating stock
WO2001020052A2 (fr) * 1999-09-16 2001-03-22 Honsel Profilprodukte Gmbh Procede et dispositif pour le traitement thermique de profiles files
WO2001020052A3 (fr) * 1999-09-16 2001-09-27 Honsel Profilprodukte Gmbh Procede et dispositif pour le traitement thermique de profiles files
DE102007062551A1 (de) * 2007-12-20 2009-06-25 Otto Junker Gmbh Vorrichtung zur Erwärmung von Metallbolzen
DE102007062551B4 (de) * 2007-12-20 2012-02-23 Otto Junker Gmbh Vorrichtung und Verfahren zur Erwärmung von Metallbolzen

Also Published As

Publication number Publication date
NO851948L (no) 1985-11-19
NO166289C (no) 1991-06-26
NO166289B (no) 1991-03-18
EP0162013A3 (en) 1987-04-29
CA1233639A (fr) 1988-03-08
JPS619514A (ja) 1986-01-17
DE3418603C1 (de) 1985-03-21
US4620840A (en) 1986-11-04
ATE46965T1 (de) 1989-10-15
JPH0582450B2 (fr) 1993-11-19
DE3573470D1 (en) 1989-11-09
EP0162013B1 (fr) 1989-10-04

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