EP0829554B1 - Niederdruck-Aufkohlungsanlage mit mehreren hintereinander angeordneten Kammern - Google Patents
Niederdruck-Aufkohlungsanlage mit mehreren hintereinander angeordneten Kammern Download PDFInfo
- 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
- Authority
- 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
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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.
Landscapes
- 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)
Description
- die Transportorgane sind als Rollenbahn ausgebildet, die die Chargen nacheinander führt durch
- eine vakuumdichte Einfahrschleuse,
- eine evakuierbare Aufheizkammer, in der die Chargen unter Stickstoff bei 100 bis 200 kPa (1 bis 2 bar) aufgeheizt werden,
- wenigstens eine Aufkohlungskammer, in der bei einem Druck von .0.1 bis 60kPa abs. (1 bis 600 mbar abs.), vorzugsweise 1 bis 3 kPa abs. (10 bis 30 mbar abs.), mit Kohlungsgas aufgekohlt wird,
- mindestens eine Diffusionskammer und
- eine Abschreckkammer für eine Hochdruck- Gasabschreckung.
Claims (10)
- Niederdruck-Aufkohlungsanlage mit mehreren hintereinander angeordneten Kammern, durch die die Chargen mittels Transportorganen bewegt werden, definiert durch die Kombination folgender, an sich bekannter Merkmale:die Transportorgane sind als Rollenbahn (22) ausgebildet, die die Chargen (4) nacheinander führt durcheine vakuumdichte Einfahrschleuse (6),eine evakuierbare Aufheizkammer (7), in der die Chargen (4) unter Stickstoff bei 100 bis 200 kPa (1 bis 2 bar) aufgeheizbar sind,wenigstens eine Aufkohlungskammer (10,11), zur Aufkohlung bei einem Druck von 0.1 bis 60 kPa abs. (1 bis 600 mbar abs.), vorzugsweise 1 bis 3 kPa abs. (10 bis 30 mbar abs.), mit Kohlungsgas,mindestens eine Diffusionskammer (13,14) undeine Abschreckkammer (17) für eine Hochdruck- Gasabschreckung.
- Anlage nach Anspruch 1, bei der die Beheizung der Niederdruck-Aufkohlungskammer und/oder der Diffusionskammer mittels Mantel-Strahlrohren, vorzugsweise mittels Elektrostrahlrohren oder Gasstrahlrohren erfolgt.
- Anlage nach Anspruch 1, bei der die Rollen der Rollenbahn (22) pendelnd bewegbar sind.
- Anlage nach Anspruch 1, bei der eine im Chargenraum befindliche, bewegliche Gasleiteinrichtung (35) die vom Kühlgas bestrichene Fläche auf die Chargengrundfläche beschränkt und den freien Querschnitt mit der Charge mitführt.
- Anlage nach Anspruch 4, bei der die Bewegung der Gasleiteinrichtung (35) über den Rollenantrieb erfolgt.
- Anlage nach Anspruch 4, bei der daß die Bewegung der Gasleiteinrichtung (35) mittels Pneumatikzylindern erfolgt.
- Anlage nach einem der Ansprüche 1 bis 6, bei der der Abschreckkammer (17) ein Röllchenherd-Anlaßofen (19) nachgeschaltet ist.
- Anlage nach einem der Ansprüche 1 bis 7, bei der zwei getrennte Aufkohlungskammern (10,11) hintereinander angeordnet sind.
- Anlage nach einem der Ansprüche 1 bis 8, bei der die Rollen als hohle Zylinder (47) ausgebildet sind, in die Elektrostrahlelemente eingeschoben und mittels Drehdurchführung (48) gehalten werden.
- Anlage nach einem der Ansprüche 1 bis 8, bei der die Rollen (22) im Chargierraum in Keramik- oder Grafitlagern (42) gehalten werden, die das Biegemoment aufnehmen können und die auf der darunter befindlichen Isolation (44) abgestützt werden.
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 (de) | 1998-03-18 |
EP0829554B1 true EP0829554B1 (de) | 2000-04-26 |
EP0829554B2 EP0829554B2 (de) | 2004-05-12 |
Family
ID=3517678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97890166A Expired - Lifetime EP0829554B2 (de) | 1996-09-16 | 1997-08-19 | Niederdruck-Aufkohlungsanlage mit mehreren hintereinander angeordneten Kammern |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0829554B2 (de) |
AT (1) | AT404029B (de) |
DE (1) | DE59701501D1 (de) |
Families Citing this family (6)
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)
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 (en) * | 1992-10-15 | 1994-04-28 | Tsuguhiko Nakagawa | Method of continuously carburizing metal strip |
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 |
-
1996
- 1996-09-16 AT AT0163596A patent/AT404029B/de not_active IP Right Cessation
-
1997
- 1997-08-19 DE DE59701501T patent/DE59701501D1/de not_active Expired - Fee Related
- 1997-08-19 EP EP97890166A patent/EP0829554B2/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE59701501D1 (de) | 2000-05-31 |
ATA163596A (de) | 1997-12-15 |
EP0829554A1 (de) | 1998-03-18 |
AT404029B (de) | 1998-07-27 |
EP0829554B2 (de) | 2004-05-12 |
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