EP1077267A1 - Vorrichtung zum Durchlaufwärmebehandeln von metallischen Werkstücken, einzeln oder gruppenweise - Google Patents

Vorrichtung zum Durchlaufwärmebehandeln von metallischen Werkstücken, einzeln oder gruppenweise Download PDF

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Publication number
EP1077267A1
EP1077267A1 EP99116269A EP99116269A EP1077267A1 EP 1077267 A1 EP1077267 A1 EP 1077267A1 EP 99116269 A EP99116269 A EP 99116269A EP 99116269 A EP99116269 A EP 99116269A EP 1077267 A1 EP1077267 A1 EP 1077267A1
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EP
European Patent Office
Prior art keywords
temperature
parts
channel
heat treatment
zone
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
EP99116269A
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English (en)
French (fr)
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EP1077267B1 (de
Inventor
Thierry Spérisen
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.)
Patherm SA
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Patherm SA
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Filing date
Publication date
Application filed by Patherm SA filed Critical Patherm SA
Priority to DE69918548T priority Critical patent/DE69918548T2/de
Priority to AT99116269T priority patent/ATE270714T1/de
Priority to EP99116269A priority patent/EP1077267B1/de
Publication of EP1077267A1 publication Critical patent/EP1077267A1/de
Application granted granted Critical
Publication of EP1077267B1 publication Critical patent/EP1077267B1/de
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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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0043—Muffle furnaces; Retort furnaces
    • 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
    • C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
    • 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
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces

Definitions

  • the present invention relates to a thermal treatment installation of metallic pieces in batches or units at the parade. More specifically the invention relates to such an installation comprising means allowing avoid the accumulation of condensate from elements of the alloy of parts above it in areas of the installation where the parts to are not yet fully solidified.
  • the parade heat treatment which successively includes a warm-up phase, a temperature maintenance phase, and finally a cooling phase, of loose or unit parts in alloy containing elements with high vaporization pressure (designated by thereafter by EPVE), under oxidative, inert or reducer presents many difficulties arising from vaporization or of the sublimation of these same elements.
  • sublimation stops at a temperature below the sublimation temperature.
  • Heat treatment furnaces with transport system for parts through the furnace through continuous movement or discontinuous of a support on which the parts to be treated are arranged, by example a conveyor belt made of a weaving of alloy wires resistant to high temperature, make it possible to carry out annealing without physical alteration of the treated parts.
  • ovens assimilated to a heated enclosure, with accesses, by example of doors or simply openings on either side of rooms entry and exit areas, typically consist of a entry area with a parallelepipedic channel or circular sheet metal section, followed by a heating zone, then a cooling part consisting of a box cooled for example by means of a double wall in which circulates a cooling fluid (water, air, etc.) and finally from an area outlet, these various zones being joined together, by example via bolted flanges.
  • a cooling fluid water, air, etc.
  • the oven be brought to a temperature higher than the sublimation temperature of EPVE, so as to have cycles of treatment as short as possible, which is also incompatible with the surface quality requirements of the parts treated. Indeed, the accumulation condensate in the cold part of the installation, i.e. at the entrance to the heating zone (inlet channel, start of oven) and at the start of the cooling, causing falling tasks that alter irremediably the parts.
  • This phenomenon of sublimation of EPVE can be significantly reduced or even avoided by using a strongly oxidizing protective gas, by example an O2 + N2 mixture, a wet gas, mixtures of N2 and water or N2 and H2 and water, or just air.
  • a strongly oxidizing protective gas by example an O2 + N2 mixture, a wet gas, mixtures of N2 and water or N2 and H2 and water, or just air.
  • these atmospheres cause a strong oxidation of the treated parts, with for consequence, especially for the monetary flanks, an increase sensitive to the physico-chemical treatment times of surface finishing, commonly called brightening.
  • the material losses which result of these operations are important.
  • the invention consists, during heat treatments of loose, batch, unit or continuous (such as strips, wires or profiles) in a passage oven under protective atmosphere likely to cause formation of vapors from the parts to be treated, to avoid any possibility of fallout of condensate particles from these vapors on the parts, when these are, or will be brought to temperatures higher than the temperatures of these particles.
  • the invention consists in avoiding that the EPVE cannot condense above the parts bed.
  • the invention relates to a treatment installation thermal treatment of metal parts in batches or units on parade in an oven gas flow circulation channel, said parts being composed of at least less an alloy capable of emitting elements at vapor pressure high (EPVE) depending on the oven temperature and the composition of the gas flow and said oven, successively comprising at least one zone at the entrance to the rooms, at least one heating zone and at least one heating zone cooling, as well as at least one means of driving the parts to through these different zones and at least one device for introducing the gas flow, characterized in that the cooling zone consists from two different successive sectors, and in that the first sector, extending from the end of the heating zone or the heating channel to the start of the second sector, includes a channel presenting on all or part of its length a temperature gradient between the upper part and the lower such that the wall directly above the parts is maintained at a temperature greater than or equal to the temperature of condensation of EPVE, and that the second sector includes a channel whose the walls are brought to a temperature below the temperature of condensation of EPVE.
  • EPVE vapor pressure high
  • the invention can be arranged at the entrance to the heating zone and / or in the cooling zone.
  • the different channels 4, 5, 11 and 12 are linked together by means of example of flanges 16.
  • Figure 2 describes in more detail the entry area 1 according to the plan of Il-Il section defined in Figure 1.
  • the entry area 1 consists of a channel 4 of cylindrical or parallelepipedic section, for example the extension of the heating channel 8 or an attached part coupled to the heating channel for example by means of a flange 16.
  • the length of the entry zone 1 depends on the passage height of channel 4 but is typically less than the length of the heating zone 2.
  • the entrance area 1 comprises in the upper part, above the parts to be treated, a physical separation 17 arranged so as to spare a space between its upper part and the inlet channel and intended, for channel the flow of vapor-laden gas between the canal ceiling and this separation and, to collect the condensates, thus avoiding any fallout of particles that can cause irreparable damage to parts.
  • This separation can consist for example of a plate maintained by supports 18 integral with the channel, for example brackets, pins.
  • supports 18 integral with the channel for example brackets, pins.
  • the same effect can be achieved through a sheet bent in the shape of an inverted U, the sides of which rest on the bottom of the channel.
  • This physical separation 17 partially extends 17a in the heating zone without however crossing it entirely. Typically, this separation 17a extends into the heating zone up to a distance substantially equal to where the parts reach temperature evaporation or sublimation of EPVE.
  • Cleaning frequencies are essentially a function of the quantities of EPVE contained in the parts treat.
  • the physical separation system 17 can be completed with a device heated 19 to maintain the temperature of the wall above the parts at a temperature higher than the condensation temperature of vapors from EPVE.
  • the heater 19 is for example made up of a metallic coil of type armored heating body, whether or not integral with the partition 17, in order to maintain its temperature at a temperature higher than the temperature of condensation of vapors from EPVE.
  • the physical separation 17 need not necessarily extend to the interior of the heating zone 3.
  • the regulation of the separation temperature is conventionally operated by means of a measurement temperature (for example a thermocouple) and a temperature regulator conventional temperature, not shown.
  • the parallelepiped section can be fitted at the ceiling with a duct vapor evacuation (not shown), typically a section tube cylindrical directly welded to the channel, or with a removable junction by through flasks.
  • Gas extraction can be natural or forced, for example by venturi effect, supplemented if necessary by a system of mechanical filtering or condensation of vapors by vacuum.
  • the temperature of the walls of the channel 5 in look of the parts is higher than the condensation temperature of vapors from the sublimation of EPVE contained in the parts there there is therefore no risk of condensate formation liable to pollute the rooms.
  • Figure 3 shows a section, along the plane III-III of Figure 1, of the first sector 9 of the cooling zone 8 and consists of at least minus a parallelepipedic or circular channel 11, depending on the geometry of the upstream and downstream interfaces.
  • the first sector 9 of the cooling zone 8 extends from the end the heating zone or the heating channel 5 if it extends slightly further than the heating zone 3 proper.
  • the first sector is characterized by the fact that it is ensured that the temperature of the inner surface of channel 11 or any surface placed directly above the parts is maintained at a temperature such that condensation of EPVE is not possible on this surface too a long time, or a sufficient distance respectively, to allow pieces to reach a temperature below the melting temperature condensates.
  • the extent of the first sector of the cooling zone depends on the processing temperature in the heating and dissipation area energy of the parts (cooling) in the cooling zone.
  • the length of the first sector 9 of the cooling zone 8 is 2 to 4 meters for a total length of the cooling zone 8 of about ten meters and a length of the heating zone 3 of 4-6 meters.
  • the first sector 9 of the cooling zone is characterized in that the upper surface 21 located above the parts (which can be the surface of channel 11 or another surface) is not cooled as is the case in a conventional processing oven.
  • This surface 21 is on the contrary thermally insulated by means of an insulator thermal 24 whose thickness is adapted accordingly (typically 100 300 mm) disposed inside or outside the channel 11, said surface 21 can also be provided with a heating system 20.
  • the heating system 20 can be arranged either outside or at the interior of channel 11 and does not necessarily have to extend over the entire distance from the first sector of the cooling zone. Heating 20 can be achieved by conventional electric heaters or through a gas burner. Temperature regulation desired on the surface is conventionally carried out by means for example of a temperature measurement and a conventional temperature controller, not shown.
  • the part of the system below the parts can be cooled by example by means of a double wall 22 in which a fluid circulates cooling (water, air, etc.).
  • This double coat can be placed at inside or outside the canal 11.
  • Possible condensation of EPVE on the bottom of the channel 11 thus cooled is of no consequence since the cold surfaces are located under the parts and no damage to the surface of the parts is not to be feared.
  • the system can be equipped with a vapor evacuation device (not shown), typically a cylindrical section tube directly welded to the system ceiling channel, or with a removable junction via flanges.
  • a vapor evacuation device typically a cylindrical section tube directly welded to the system ceiling channel, or with a removable junction via flanges.
  • Gas extraction can be natural or forced, for example by effect venturi, supplemented if necessary by a mechanical filtering system or vapor condensation by vacuum.
  • the vapor exhaust system must be accessible for the in situ cleaning of condensates, the solution of a junction removable for example by flanges is therefore preferable.
  • the second sector 10 of the cooling zone 8 can be typically consisting of a double mantle 23 or channel in which a coolant, including at the top which is voluntarily cooled to accelerate the cooling of the parts.
  • This part can also be equipped with a convection device shielding gas and a heat exchanger to allow cool the parts faster and decrease the length of the cooling 12.
  • gas treatment or protection of parts e.g. nitrogen, hydrogen, argon or mixtures gas
  • gas treatment or protection of parts e.g. nitrogen, hydrogen, argon or mixtures gas
  • the invention overcomes the disadvantages of the prior art by providing a heat treatment installation for susceptible parts to issue EPVEs in which the processing time is relatively short without causing an irreversible change in the appearance of parts surface.

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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)
  • Furnace Details (AREA)
  • Heat Treatment Of Articles (AREA)
EP99116269A 1999-08-18 1999-08-18 Vorrichtung zum Durchlaufwärmebehandeln von metallischen Werkstücken, einzeln oder gruppenweise Expired - Lifetime EP1077267B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE69918548T DE69918548T2 (de) 1999-08-18 1999-08-18 Vorrichtung zum Durchlaufwärmebehandeln von metallischen Werkstücken, einzeln oder gruppenweise
AT99116269T ATE270714T1 (de) 1999-08-18 1999-08-18 Vorrichtung zum durchlaufwärmebehandeln von metallischen werkstücken, einzeln oder gruppenweise
EP99116269A EP1077267B1 (de) 1999-08-18 1999-08-18 Vorrichtung zum Durchlaufwärmebehandeln von metallischen Werkstücken, einzeln oder gruppenweise

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99116269A EP1077267B1 (de) 1999-08-18 1999-08-18 Vorrichtung zum Durchlaufwärmebehandeln von metallischen Werkstücken, einzeln oder gruppenweise

Publications (2)

Publication Number Publication Date
EP1077267A1 true EP1077267A1 (de) 2001-02-21
EP1077267B1 EP1077267B1 (de) 2004-07-07

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EP99116269A Expired - Lifetime EP1077267B1 (de) 1999-08-18 1999-08-18 Vorrichtung zum Durchlaufwärmebehandeln von metallischen Werkstücken, einzeln oder gruppenweise

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EP (1) EP1077267B1 (de)
AT (1) ATE270714T1 (de)
DE (1) DE69918548T2 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100432274C (zh) * 2005-12-01 2008-11-12 重庆飞达电炉有限公司 铝合金固溶、时效燃气加热处理炉
DE102014010711B4 (de) * 2014-07-19 2019-08-29 Wieland-Werke Ag Verfahren zur Glühbehandlung von zinkhaltigen Kupferlegierungsbändern

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1906092A (en) * 1930-07-30 1933-04-25 Strong Carlisle & Hammond Comp Conveyer furnace
EP0355520A2 (de) * 1988-08-18 1990-02-28 Linde Aktiengesellschaft Verfahren zur Wärmebehandlung von Werkstücken
JPH03240938A (ja) * 1990-02-16 1991-10-28 Furukawa Electric Co Ltd:The 銅一亜鉛合金線の熱処理方法
DE4339315A1 (de) * 1993-11-18 1995-05-24 Kohnle W Waermebehandlung Anlage zur Wärmebehandlung von Kleinteilen aus Metall, insbesondere aus Zink enthaltenden Buntmetallen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1906092A (en) * 1930-07-30 1933-04-25 Strong Carlisle & Hammond Comp Conveyer furnace
EP0355520A2 (de) * 1988-08-18 1990-02-28 Linde Aktiengesellschaft Verfahren zur Wärmebehandlung von Werkstücken
JPH03240938A (ja) * 1990-02-16 1991-10-28 Furukawa Electric Co Ltd:The 銅一亜鉛合金線の熱処理方法
DE4339315A1 (de) * 1993-11-18 1995-05-24 Kohnle W Waermebehandlung Anlage zur Wärmebehandlung von Kleinteilen aus Metall, insbesondere aus Zink enthaltenden Buntmetallen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 016, no. 029 (C - 0904) 24 January 1992 (1992-01-24) *

Also Published As

Publication number Publication date
EP1077267B1 (de) 2004-07-07
ATE270714T1 (de) 2004-07-15
DE69918548T2 (de) 2005-08-25
DE69918548D1 (de) 2004-08-12

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