EP0368035A1 - Apparatus for the discontinuous desludging of salt baths - Google Patents

Apparatus for the discontinuous desludging of salt baths Download PDF

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Publication number
EP0368035A1
EP0368035A1 EP89119225A EP89119225A EP0368035A1 EP 0368035 A1 EP0368035 A1 EP 0368035A1 EP 89119225 A EP89119225 A EP 89119225A EP 89119225 A EP89119225 A EP 89119225A EP 0368035 A1 EP0368035 A1 EP 0368035A1
Authority
EP
European Patent Office
Prior art keywords
desludging
filter unit
discontinuous
salt
conveyor tube
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
EP89119225A
Other languages
German (de)
French (fr)
Other versions
EP0368035B1 (en
Inventor
Georg Dipl.-Ing. Wahl
Klaus Dipl.-Ing. Breitwieser
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.)
Houghton Durferrit degussa-Huels AG GmbH
Original Assignee
Degussa GmbH
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Filing date
Publication date
Application filed by Degussa GmbH filed Critical Degussa GmbH
Priority to AT89119225T priority Critical patent/ATE89326T1/en
Publication of EP0368035A1 publication Critical patent/EP0368035A1/en
Application granted granted Critical
Publication of EP0368035B1 publication Critical patent/EP0368035B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/44—Methods of heating in heat-treatment baths
    • C21D1/46—Salt baths
    • 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
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/18—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions
    • 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
    • C23C8/40—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 liquids, e.g. salt baths, liquid suspensions

Abstract

For the discontinuous desludging of salt baths an apparatus is used which consists of feed pipe (2), air supply line (1) and filter unit (3). The device additionally carries, at the lower end of the feed pipe, a base plate (7) having spacers (4) facing towards the bottom of the crucible and is provided with a suction endpiece (5) which can move telescopically in the feed pipe. <IMAGE>

Description

Die Erfindug betrifft eine Vorrichtung zur diskontinuierlichen Entschlammung von der Metallbehandlung dienenden Salzbädern, bestehend aus einem Förderrohr, einer Luftzuleitung und einer Filtereinheit.The invention relates to a device for the discontinuous desludging of salt baths used for metal treatment, consisting of a delivery pipe, an air supply line and a filter unit.

Bei der Wärmebehandlung von Eisenteilen in Salzschmelzen wird die Qualität der behandelten Bauteile wesentlich vom Schlammgehalt und der Sauberkeit der Salzschmelze beeinflußt. Die Schlammbildung ist auf verschiedene Ursachen zurückzuführen, wie mit dem Behandlungsgut eingeschleppter Schleifstaub, Bearbeitungsspäne, Rost und Zunder sowie Verunreinigungen durch Chargiergestelle. Eisenverunreinigungen im Bad beeinflussen auch die Ausbildung der Verbindungsschicht von im Salzbad nitrocarburierter Teile.In the heat treatment of iron parts in molten salts, the quality of the treated components is significantly influenced by the sludge content and the cleanliness of the molten salt. The sludge formation can be attributed to various causes, such as grinding dust brought in with the material to be treated, processing chips, rust and scale, as well as contamination from charging racks. Iron contamination in the bath also influences the formation of the connection layer of parts nitrocarburized in the salt bath.

Zur Reduzierung des Schlammanfalls in Salzbädern ist eine regelmäßige Badentschlammung erforderlich. Es sind eine ganze Reihe von Vorrichtungen, insbesondere mit Sieben versehene Schöpfkellen bekannt, um diesen Schlamm von Zeit zu Zeit aus dem Salzbad zu entfernen. Diese bekannten Vorrichtungen haben den Nachteil, daß der Bodensatz nicht vollständig erfaßt wird und der Entschlammungsvorgang nach Aufrühren des Tiegelbodens mehrfach wiederholt werden muß.Regular sludge removal is required to reduce the amount of sludge in salt baths. A whole series of devices, in particular sieves provided with ladles, are known for removing this sludge from the salt bath from time to time. These known devices have the disadvantage that the sediment is not completely detected and the desludging process has to be repeated several times after stirring the crucible bottom.

Aus der DE-PS 3733721 ist eine Vorrichtung zur kontinuierlichen Entschlammung von Salzbädern bekannt, die aus einem Förderrohr, einer Luftzuführung und einer Filtereinheit besteht, die ganz oder teilweise in das Salzbad eintaucht. Diese Vorrichtung hat den Nachteil, das ein Teil des Bades für die Nutzung verlorengeht. Andererseits ist sie für einen diskontinuierlichen Betrieb nicht brauchbar, da der zeitliche Aufwand für einen Salzbaddurchsatz relativ groß ist.From DE-PS 3733721 a device for continuous desludging of salt baths is known, which consists of a delivery pipe, an air supply and a filter unit that is completely or partially immersed in the salt bath. This device has the disadvantage that part of the bath is lost for use. On the other hand, it is not suitable for discontinuous operation, since the time required for a salt bath throughput is relatively large.

Es war daher Aufgabe der vorliegenden Erfindung, eine Vorrichtung zur diskontiniuerlichen Entschlammung von der Metallbehandlung dienenden Salzbädern zu entwickeln, bestehend aus einem Förderrohr, einer Luftzuführung und einer Filtereinheit, mit der ein Salzbaddurchsatz in kurzen Zeiträumen möglich ist und der gesamte Bodenschlamm erfasst wird.It was therefore an object of the present invention to develop a device for the discontinuous desludging of the salt baths serving the metal treatment, consisting of a conveying pipe, an air supply and a filter unit with which a salt bath throughput is possible in short periods of time and the entire soil sludge is recorded.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß am unteren Ende des Förderrohrs eine die Förderrohröffnung freilassende Bodenplatte angebracht ist, die in Richtung Salzbadtiegelboden mit Abstandshaltern versehen ist, daß in dem Förderrohr ein Ansaugstutzen angeordnet ist, der sich im Förderrohr teleskopartig nach unten und oben bewegen kann, und das die Filtereinheit in einer solchen Höhe am Förderrohr befestigt ist, die ein vollständiges oder teilweises Eintauchen der Filtereinheit in das Salzbad gewährleistet.This object is achieved in that at the lower end of the conveyor tube a bottom plate is left open the conveyor tube opening, which is provided in the direction of the salt bath crucible bottom with spacers that an intake port is arranged in the conveyor tube, which can move telescopically down and up in the conveyor tube , and that the filter unit is attached to the conveyor tube at a height that ensures complete or partial immersion of the filter unit in the salt bath.

Gegenüber den bisher gebräuchlichen diskontinuierlich arbeitenden Schlammfiltern hat die erfindungsgemäße Vorrichtung den Vorteil, daß die geringe Spaltbreite von der Bodenplatte zum Tiegelboden für eine hohe Ansauggeschwindigkeit der Salzschmelze und gute Turbulenz unterhalb der Bodenplatte sorgt, wodurch auch der Bodenschlamm erfaßt wird. Weiterhin ist sichergestellt, daß durch den beweglichen Ansaugstutzen die zu filternde Salzschmelze vom tiefsten Punkt des Tiegel aus über das Förderrohr in die Filtereinheit befördert wird. Die hohe Förderleistung der Vorrichtung ermöglicht mehrfachen Volumenwechsel der Salzschmelze, während des Entschlammungszeitraums von etwa 20 bis 30 Minuten. Als Filtermaterialien verwendet man vorzugsweise Drahtgewebe mit Maschenweiten von 0,05 bis 0,5 mm oder Glaswolle.Compared to the previously used discontinuous sludge filters, the device according to the invention has the advantage that the narrow gap width from the base plate to the crucible base ensures a high suction speed of the molten salt and good turbulence underneath the base plate, whereby the soil sludge is also captured. Furthermore, it is ensured that the salt melt to be filtered is conveyed from the lowest point of the crucible through the conveyor tube into the filter unit by the movable suction nozzle. The high delivery capacity of the device enables multiple volume changes of the molten salt during the desludging period of about 20 to 30 minutes. Wire fabrics with mesh sizes of 0.05 to 0.5 mm or glass wool are preferably used as filter materials.

Die Abbildung zeigt schematisch eine beispielhafte Ausführungsform der erfindungsgemäßen Vorrichtung im Längsschnitt.The figure schematically shows an exemplary embodiment of the device according to the invention in longitudinal section.

Die Vorrichtung besteht aus einem Förderrohr (2), in dem sich eine Luftzuleitung (1) und am unteren Ende ein teleskopartig verschiebbarer Ansaugstutzen (5) befindet. Weiterhin ist am unteren Ende des Förderrohrs (2) eine Bodenplatte (7) befestigt, die die Ansaugöffnung des Förderrohrs (2) freilässt und gegen den Tiegelboden hin mit Abstandshaltern (4) versehen ist. Im oberen Bereich des Förderrohrs (2) ist die Filtereinheit (3) angebracht. In diesem Bereich ist das Förderrohr (2) mit Schlitzen (6) versehen.The device consists of a conveyor pipe (2), in which there is an air supply line (1) and at the lower end a telescopically displaceable suction nozzle (5). Furthermore, a bottom plate (7) is attached to the lower end of the conveyor tube (2), which leaves the suction opening of the conveyor tube (2) free and is provided with spacers (4) against the crucible bottom. The filter unit (3) is attached in the upper area of the delivery pipe (2). In this area, the delivery pipe (2) is provided with slots (6).

Zum eigentlichen Entschlammungsprozeß wird die bei etwa 350o C in einem Vorwärmofen gut vorgewärmte und absolut trockene Vorrichtung langsam in das Salzbad eingefahren. Dabei sollte die Entschlammungsvorrichtung zentrisch auf dem Tiegelboden aufstehen. Danach wird die Luftzufuhr an die Luftzuleitung (1) angeschlossen und soweit aufgedreht, bis das flüssige Salz kontinuierlich durch die Schlitze (6) des Förderrohres (2) in die Filtereinheit (3) läuft. Während des Entschlammungsvorgangs setzt sich je nach Verschmutzungsgrad des Bades der Filter zu. Dies führt zu einem Ansteigen des Salzspiegels in der Filtereinheit. Im allgemeinen ist der Entschlammungsvorgang nach 30 Minuten beendet, wenn kein weiteres Ansteigen des Badspiegels zu beobachten ist.For the actual Entschlammungsprozeß the device o C good pre-heated at about 350 in a preheating furnace and absolutely dry slowly in the salt bath retracted. The desludging device should stand centrally on the crucible bottom. Then the air supply is connected to the air supply line (1) and turned up until the liquid salt runs continuously through the slots (6) of the delivery pipe (2) into the filter unit (3). Depending on the degree of contamination of the bath, the filter clogs up during the desludging process. This leads to an increase in the salt level in the filter unit. In general, the desludging process ends after 30 minutes if no further rise in the bath level is observed.

Claims (1)

Vorrichtung zur diskontinuierlichen Entschlammung von der Metallbehandlung dienenden Salzbädern, bestehend aus einem Förderrohr, einer Luftzuleitung und einer Filtereinheit,
dadurch gekennzeichnet,
daß am unteren Ende des Förderrohrs (2) eine die Förderrohröffnung freilassende Bodenplatte (7) angebracht ist, die in Richtung Salzbadtiegelboden mit Abstandshaltern (4) versehen ist,
daß in dem Förderrohr (2) ein Ansaugstutzen (5) angeordnet ist, der sich im Förderrohr (2) teleskopartig nach unten und oben bewegen kann, und
daß die Filtereinheit (3) in einer solchen Höhe am Förderrohr (2) befestigt ist, die ein vollständiges oder teilweises Eintauchen der Filtereinheit (3) in das Salzbad gewährleistet.Apparatus for the discontinuous desludging of salt baths used for metal treatment, consisting of a delivery pipe, an air supply line and a filter unit,
characterized,
that at the lower end of the conveyor tube (2) there is a bottom plate (7) which leaves the conveyor tube opening free and which is provided with spacers (4) in the direction of the salt bath crucible bottom,
that in the delivery pipe (2) an intake (5) is arranged, which can move telescopically down and up in the delivery pipe (2), and
that the filter unit (3) is attached to the conveyor tube (2) at a height which ensures complete or partial immersion of the filter unit (3) in the salt bath.
EP89119225A 1988-10-29 1989-10-17 Apparatus for the discontinuous desludging of salt baths Expired - Lifetime EP0368035B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89119225T ATE89326T1 (en) 1988-10-29 1989-10-17 DEVICE FOR DISCONTINUOUS DEFILLING OF SALT BATHS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3836939A DE3836939C1 (en) 1988-10-29 1988-10-29
DE3836939 1988-10-29

Publications (2)

Publication Number Publication Date
EP0368035A1 true EP0368035A1 (en) 1990-05-16
EP0368035B1 EP0368035B1 (en) 1993-05-12

Family

ID=6366189

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89119225A Expired - Lifetime EP0368035B1 (en) 1988-10-29 1989-10-17 Apparatus for the discontinuous desludging of salt baths

Country Status (5)

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EP (1) EP0368035B1 (en)
JP (1) JP2904825B2 (en)
AT (1) ATE89326T1 (en)
DE (2) DE3836939C1 (en)
ES (1) ES2040436T3 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4400755A1 (en) * 1993-01-26 1994-07-28 Leybold Durferrit Gmbh Filter unit and appts. for removal salt bath sludge
ATE186754T1 (en) * 1994-01-13 1999-12-15 Houghton Durferrit Gmbh FILTER UNIT AND DEVICE FOR DESILDING SALT BATHS
KR101144400B1 (en) * 2011-06-21 2012-05-10 현대위아 주식회사 Device for carrying salt for heat treatment
CN104671060A (en) * 2015-02-11 2015-06-03 河南东风新研材科技有限公司 Grinding wheel bracket
CN106744238A (en) * 2015-11-25 2017-05-31 桃江县扬洋机电科技有限公司 A kind of thin and long units salt bath surface treatment hanging

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH374378A (en) * 1958-06-03 1964-01-15 Degussa Method and device for desludging hot baths in hardening technology
GB2046611A (en) * 1979-03-22 1980-11-19 Degussa Process and apparatus for desludging salt baths
DE2923028A1 (en) * 1979-06-07 1980-12-18 Volkswagenwerk Ag Removing sludge from nitriding baths - using a suction pump and passing the sludge contg. bath through a filter
DE3733721C1 (en) * 1987-10-06 1988-04-21 Degussa Device for the continuous desludging of salt baths

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2731167C3 (en) * 1977-07-09 1980-12-04 Degussa Ag, 6000 Frankfurt Use of inorganic fiber materials for cleaning salt baths and device for using these fiber materials

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH374378A (en) * 1958-06-03 1964-01-15 Degussa Method and device for desludging hot baths in hardening technology
GB2046611A (en) * 1979-03-22 1980-11-19 Degussa Process and apparatus for desludging salt baths
DE2923028A1 (en) * 1979-06-07 1980-12-18 Volkswagenwerk Ag Removing sludge from nitriding baths - using a suction pump and passing the sludge contg. bath through a filter
DE3733721C1 (en) * 1987-10-06 1988-04-21 Degussa Device for the continuous desludging of salt baths

Also Published As

Publication number Publication date
DE58904341D1 (en) 1993-06-17
JP2904825B2 (en) 1999-06-14
JPH02170912A (en) 1990-07-02
ES2040436T3 (en) 1993-10-16
ATE89326T1 (en) 1993-05-15
DE3836939C1 (en) 1989-06-15
EP0368035B1 (en) 1993-05-12

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