EP0829554B1 - Installation pour la cémentation à basse pression avec des compartiments disposés les unes après les autres - Google Patents

Installation pour la cémentation à basse pression avec des compartiments disposés les unes après les autres Download PDF

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Publication number
EP0829554B1
EP0829554B1 EP19970890166 EP97890166A EP0829554B1 EP 0829554 B1 EP0829554 B1 EP 0829554B1 EP 19970890166 EP19970890166 EP 19970890166 EP 97890166 A EP97890166 A EP 97890166A EP 0829554 B1 EP0829554 B1 EP 0829554B1
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EP
European Patent Office
Prior art keywords
plant according
chamber
gas
pressure
carbonisation
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
EP19970890166
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German (de)
English (en)
Other versions
EP0829554A1 (fr
EP0829554B2 (fr
Inventor
Herwig Dr. Altena
Johann Ing. Berger
Josef Ing. Krickl
Gerhard Oberweger
Gerhard Ing. Sack
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ALD AICHELIN GesmbH
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ALD AICHELIN GesmbH
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Application filed by ALD AICHELIN GesmbH filed Critical ALD AICHELIN GesmbH
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising
    • 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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces

Definitions

  • the invention relates to a low-pressure carburizing plant several successively arranged chambers through which the batches can be Transport organs are moved.
  • Continuous roller hearth furnaces are also known, in which one Gas cooling section is provided between an annealing and a hardening zone (DE 42 28 006).
  • the combination according to the invention is compared to conventional Gas carburizing plants achieved a carburization free of edge oxidation, whereby Post-processing costs can be reduced or even eliminated. Moreover the carburizing time is reduced due to a significantly higher C mass flow at the start of the process, which saves time and money. Compared to oil quenching, there is the advantage that a reduced Delay occurs and that both the washing process after the oil quench as there is also no oil disposal.
  • the formation of the transport organs as a roller conveyor brings about other transport systems a lower mechanical effort and thus less susceptibility to repairs and also less mechanical Vibrations during transportation of the hot batch.
  • a reversal of the batch through roll movement in the area of Quench chamber is when cooling with liquid media and 2-phase flows (DE 44 01 228) is already known and can also be used for gases to improve the uniformity of deterrence.
  • the cross-sectional area covered by the cooling gas is, by reversing the batch must be increased, which is at a cost the gas velocity or the cooling rate at a given, maximum Engine power goes.
  • This disadvantage is avoided according to the invention in that a movable gas control system installed in the quenching chamber and shared is moved with the batch, whereby the flow of gas flows Cross-section always corresponds to the batch area.
  • the drive of the Gas control system is preferably an electromotive Roller drive with the help of a translation.
  • roller conveyor Another disadvantage of the roller conveyor can arise from the fact that the rollers are carried out according to the prior art through the insulation, stored outside the insulation and driven outside the boiler, which leads to a not negligible heat dissipation through heat conduction over the Transport roles leads. On the one hand, this causes a higher energy requirement System and on the other hand deteriorates the temperature uniformity in the Treatment chambers.
  • the transport rollers According to the invention held by ceramic or graphite bearings, which are within the hot heating, carburizing and diffusion chamber are located on the the underlying insulation.
  • the implementation to the transport engine is only carried out with a thin drive shaft that does not transmit any bending moment got to. These measures minimize energy losses.
  • the transport rollers in the Heating, carburizing and diffusion zone can be designed as a hollow cylinder, in which introduced an electric beam element or a gas burner and by means of Flange is flanged, reducing the total number Reduced feedthroughs in the heating, carburizing and diffusion chambers becomes.
  • the quenching chamber is expedient followed by a Röllchenherd tempering furnace.
  • FIG. 1 shows an elevation according to the invention in elevation Low pressure carburizing plant
  • Fig. 2 is a top view of the low pressure carburizing plant 1
  • FIGS. 3 and 4 cross sections of a Quench chamber usable within the scope of the invention.
  • Figures 5,6 and 7 give Variants of the transport rollers again.
  • a loading roller table 1 is in front of the system arranged. From this loading roller table 1, the batches 4 enter one Entry lock 6, which is vacuum-tight and can be evacuated. To the Lock 6 connects a likewise evacuable heating chamber 7. In this Heating chamber 7, the batches under nitrogen at a pressure of 1 to 2 bar heated. The heating chamber 7 is with vacuum-tight inlet and Provide outlet doors, batches 4 are heated with circulators 8 and an electric coil heater 9.
  • Carburizing chambers 10 and 11 Following the heating chamber 7 are two separate ones Carburizing chambers 10 and 11 arranged. In these carburizing chambers 10 and 11 is abs at a pressure of 0.1 to 60kPa. (1 to 600 mbar abs.), Preferably in the range from 1 to 3 kPa abs. (10 to 30 mbar abs.) Carburized with carburizing gas.
  • the arrangement of two separate carburizing chambers allows different parameters for the Beginning and end of carburization and an increase in throughput. However, the arrangement of only one is also within the scope of the invention Carburizing chamber possible. In both carburizing chambers 10 and 11 heating with jacket pipes 12.
  • the batches 4 enter a quenching chamber 17 for one High pressure gas quenching.
  • the structure of the quench chamber 17 is shown of Fig. 3 explained.
  • the batches 4 After leaving the quenching chamber 17, the batches 4 pass over a transverse drive device 18 to a Röllchenherd tempering furnace 19 and leave after passing through a cooling section 20 and an outlet roller table 21, the system.
  • the transport of the batches 4 through the plant according to the invention is how 1 is carried out by a roller conveyor 22 which a slow, horizontal pendulum movement of the batch during heating, Carburization and deterrence to even out the treatment outcome enables.
  • a preferred embodiment of the quenching chamber 17 is shown in section in FIG. 3 shown.
  • a motor 32 is placed on a housing 31, which drives a fan wheel 33.
  • a fan wheel 33 Within the lower part 34 one in the housing Batch 4 lies on the 31 round or square jacket Transport rollers 22.
  • the jacket expands upwards and inside the extended part 37, a heat exchanger 38 is arranged. This heat exchanger However, 38 does not take up the entire space within part 37 of the shell so that a free cross section 39 is formed.
  • the fan wheel 33 promotes nitrogen gas in the sense of the arrows outside of the jacket 34, 37 down, where it is deflected by 90 ° and after above cooling the batch 4 sweeps past it. Subsequently the cooling gas flows partly through the heat exchanger 38, partly through the free one Cross-section 39, the two flows before entering the fan wheel Reunite 33.
  • the transport rollers 22 of the quenching chamber 17 allow one Reverse the batch by means of a horizontal pendulum movement, thereby reducing the Uniformity of deterrence can be improved.
  • the one in the batch room located, movable gas guide 35 limits the cooling gas coated area largely on the batch base area and leads the free Cross section with the batch with. This prevents the cooling gas alternately flows in front of and behind the batch, if this during the Cooling is reversibly reversed.
  • the movement of the gas guide device can preferably done via the roller drive.
  • Other solutions, such as the Displacement using pneumatic cylinders is also possible.
  • a control valve 41 can be installed, which uses the pressure difference between bypass and immediately behind the heat exchanger on level 2 is controlled in such a way that the cooling time of the batch is minimized.
  • the measured flap can be used to determine the optimal flap position Evaluation unit (computer) can be connected.
  • FIG. 5 A preferred embodiment of the transport rollers is shown in FIG. 5.
  • the transport rollers 22 are here according to the invention by ceramic or Graphite bearing 42 held within the hot heating, carburizing and Diffusion chamber 43 are located on the underlying insulation 44th lie on.
  • Several transport rollers are driven outside by means of a chain drive connected to the heating chamber.
  • FIG. 7 Another embodiment variant is shown in FIG. 7. Then you can Transport rollers in the heating, carburizing and diffusion zone as a hollow Cylinder 47 can be designed in which an electric heating element or gas burner is introduced and which are flanged by means of a rotary union 48. As a result, the total number of bushings in the heating, Carburizing and diffusion chambers reduced.
  • the quenching chamber 17 can be designed with lowerable transport rollers, the place the batch on a fixed batch carrier, the number of Carburizing chambers could be two and the number of diffusion chambers could be three deviate.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Tunnel Furnaces (AREA)

Claims (10)

  1. Installation de cémentation au carbone à basse pression, comprenant plusieurs chambres disposées les unes à la suite des autres, que les charges traversent à l'intervention d'organes de transport, installation définie par la combinaison des caractéristiques suivantes, connues en soi :
    les organes de transport sont réalisés sous forme de transporteur à rouleaux (22) qui fait passer les charges (4) successivement par
    un sas d'introduction (6) étanche au vide,
    une chambre de chauffage (7) pouvant être mise sous vide, dans laquelle les charges (4) peuvent être chauffées sous atmosphère d'azote à 100 à 200 kPa (1 à 2 bar),
    au moins une chambre de cémentation au carbone (10, 11) pour carburation à une pression de 0,1 à 60 kPa abs (1 à 600 mbar abs.), de préférence de 1 à 3 kPa abs. (10 à 30 mbar abs.), avec du gaz de carburation,
    au moins une chambre de diffusion (13, 14), et
    une chambre de trempe (17) pour une trempe au gaz à haute pression.
  2. Installation suivant la revendication 1, dans laquelle le chauffage de la chambre de cémentation au carbone à basse pression et/ou la chambre de diffusion se fait par des tubes radiants chemisés, de préférence des tubes radiants électriques ou des tubes radiants au gaz.
  3. Installation suivant la revendication 1, dans laquelle les rouleaux de la bande transporteuse à rouleaux (22) sont déplaçables à la manière d'un pendule.
  4. Installation suivant la revendication 1, dans laquelle un disposition déflecteur de gaz mobile (35) se trouvant dans l'enceinte d'enfournement limite la surface en contact avec le gaz de refroidissement à la surface de base de la charge et entraíne la section transversale libre avec la charge.
  5. Installation suivant la revendication 4, dans laquelle le dispositif déflecteur de gaz (35) est mis en mouvement via la commande des rouleaux.
  6. Installation suivant la revendication 4, dans laquelle le dispositif déflecteur de gaz (35) est mis en mouvement au moyen de vérins pneumatiques.
  7. Installation suivant l'une des revendications 1 à 6, dans laquelle un four de revenu à galets (19) fait suite à la chambre de trempe (17).
  8. Installation suivant l'une des revendications 1 à 7, dans laquelle deux chambres de cémentation au carbone séparées (10, 11) sont agencées l'une à la suite de l'autre.
  9. Installation suivant l'une des revendications 1 à 8, dans laquelle les rouleaux prennent la forme de cylindres creux (47) dans lesquels les éléments radiants électriques sont engagés et retenus par un passage tournant (48).
  10. Installation suivant l'une des revendications 1 à 8, dans laquelle les rouleaux (22) sont maintenus dans l'enceinte d'enfournement dans des roulements en céramique ou en graphite (42) qui peuvent encaisser le couple de flexion et qui prennent appui sur le dispositif d'isolation (44) sous-jacent.
EP97890166A 1996-09-16 1997-08-19 Installation pour la cémentation à basse pression avec des compartiments disposés les unes après les autres Expired - Lifetime EP0829554B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0163596A AT404029B (de) 1996-09-16 1996-09-16 Niederdruck-aufkohlungsanlage
AT163596 1996-09-16
AT1635/96 1996-09-16

Publications (3)

Publication Number Publication Date
EP0829554A1 EP0829554A1 (fr) 1998-03-18
EP0829554B1 true EP0829554B1 (fr) 2000-04-26
EP0829554B2 EP0829554B2 (fr) 2004-05-12

Family

ID=3517678

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97890166A Expired - Lifetime EP0829554B2 (fr) 1996-09-16 1997-08-19 Installation pour la cémentation à basse pression avec des compartiments disposés les unes après les autres

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EP (1) EP0829554B2 (fr)
AT (1) AT404029B (fr)
DE (1) DE59701501D1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4540406B2 (ja) * 2004-06-25 2010-09-08 富士重工業株式会社 多段連続浸炭焼入れ炉及び連続浸炭焼入れ方法
DE102008020449A1 (de) * 2008-04-01 2009-10-15 Manfred Husslein Industrieofen sowie Verfahren zum Betrieb eines Industrieofens
CN108315544A (zh) * 2018-04-08 2018-07-24 亚捷科技（唐山）股份有限公司 一种氨基气氛辊棒炉生产系统
CN110835722B (zh) * 2019-11-27 2023-08-25 特诺恩技术（天津）有限公司 一种用于齿轮渗碳热处理的滑动密封炉门
CN110846612A (zh) * 2019-12-03 2020-02-28 上海丰东热处理工程有限公司 一种真空渗碳热处理加工工艺
CN114293136A (zh) * 2021-12-31 2022-04-08 重庆市星极齿轮有限责任公司 一种工件热处理系统

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1208134A (en) * 1967-03-22 1970-10-07 Gibbons Brothers Ltd Improvements in or relating to continuous carburising
US3662996A (en) * 1970-03-23 1972-05-16 Holcroft & Co Multi-chamber carburizing apparatus
JPS58130270A (ja) * 1982-01-27 1983-08-03 Michio Sugiyama 連続真空浸炭炉とその操業方法
JPS60138065A (ja) * 1983-12-27 1985-07-22 Chugai Ro Kogyo Kaisha Ltd ガス浸炭焼入方法およびその連続式ガス浸炭焼入設備
JPS60190511A (ja) * 1984-03-13 1985-09-28 Ishikawajima Harima Heavy Ind Co Ltd 金属熱処理設備
FR2678287B1 (fr) * 1991-06-26 1993-10-29 Etudes Constructions Mecaniques Procede et four de cementation a basse pression.
JPH055852U (ja) † 1991-07-02 1993-01-26 中外炉工業株式会社 多室式ローラハース型イオン浸炭炉
FR2681332B1 (fr) * 1991-09-13 1994-06-10 Innovatique Sa Procede et dispositif de cementation d'un acier dans une atmosphere a basse pression.
CA2125785A1 (fr) * 1992-10-15 1994-04-28 Tsuguhiko Nakagawa Methode de carburation continue de bandes metalliques
JP3448789B2 (ja) * 1995-01-20 2003-09-22 同和鉱業株式会社 ガス浸炭方法
DE29505496U1 (de) * 1995-03-31 1995-06-01 Ipsen Ind Int Gmbh Vorrichtung zur Wärmebehandlung metallischer Werkstücke unter Vakuum

Also Published As

Publication number Publication date
DE59701501D1 (de) 2000-05-31
ATA163596A (de) 1997-12-15
EP0829554A1 (fr) 1998-03-18
AT404029B (de) 1998-07-27
EP0829554B2 (fr) 2004-05-12

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