WO1999067432A1 - Dispositif pour durcir des materiaux en vrac apres leur traitement thermochimique dans des poudres ou des granules - Google Patents

Dispositif pour durcir des materiaux en vrac apres leur traitement thermochimique dans des poudres ou des granules Download PDF

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Publication number
WO1999067432A1
WO1999067432A1 PCT/EP1999/004350 EP9904350W WO9967432A1 WO 1999067432 A1 WO1999067432 A1 WO 1999067432A1 EP 9904350 W EP9904350 W EP 9904350W WO 9967432 A1 WO9967432 A1 WO 9967432A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotary retort
sieve
inner tube
retort oven
treatment medium
Prior art date
Application number
PCT/EP1999/004350
Other languages
German (de)
English (en)
Inventor
Hans-Jörg Hunger
Original Assignee
Bortec Gmbh
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 Bortec Gmbh filed Critical Bortec Gmbh
Publication of WO1999067432A1 publication Critical patent/WO1999067432A1/fr

Links

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
    • C21D9/0031—Rotary furnaces with horizontal or slightly inclined axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/18—Drum screens
    • 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

Definitions

  • the invention relates to a method and a device for hardening bulk goods directly after the thermochemical treatment in a rotary retort oven.
  • thermochemical treatment of bulk goods e.g. chromating, boronizing or alitizing is usually carried out in a rotary retort oven with the addition of the treatment medium, which consists either of a powder or of granules.
  • the mixture of the treatment medium and the parts to be treated is treated with constant rotation of the retort at temperatures between 600 ° C and 1200 ° C until the desired layer thickness is reached.
  • the retort can be protected with a protective gas, e.g. Nitrogen or argon can be applied.
  • a protective gas e.g. Nitrogen or argon can be applied.
  • the retort and its contents are cooled to temperatures of approx. 300 ° C and below and then emptied. This process takes one to several hours.
  • the other possibility is to empty the retort while hot, the mixture of treatment medium and the bulk material being emptied together into a container.
  • the mixture cools there.
  • Treatment medium and parts to be treated are usually separated by cooling after cooling.
  • the bulk material is then reheated to hardening temperature in another heat treatment plant and then quenched in oil.
  • the object of the invention was to provide a method to achieve a simple hardening of bulk materials and to construct a device which allows the bulk material to be emptied directly into an oil bath after the thermochemical treatment without the oil bath being contaminated by the treatment medium .
  • the object is achieved by the method according to claim 1.
  • the process according to the invention for hardening bulk goods directly after a thermochemical treatment in an oven is characterized in that the bulk goods treated are separated directly into an oil bath from a treatment medium, which consists of powders or granules, during emptying of the oven fall and the treatment medium is transferred to a container.
  • a treatment medium which consists of powders or granules
  • the temperature in the oven is set at 600 to 1200 ° C. in order to treat the bulk goods with the appropriate hardening agents. Oxidation of the bulk goods can be prevented or reduced by using protective gas such as noble gases or nitrogen.
  • a rotary retort oven is preferably used to carry out the method according to the invention.
  • the rotary retort oven claimed according to the invention has an outer tube, in the interior of which an inner tube is arranged and the inner tube has a plurality of sieve holes in its surface.
  • the inner tube of the rotary retort oven is preferably rotatably mounted.
  • the contents of the furnace, bulk material or material to be treated and the material required for the thermochemical treatment are introduced into the rotating inner tube.
  • the treatment medium falls through the inner tube with a large number of sieve holes and can then be emptied through an opening into a container.
  • the material to be treated falls out of the sieve-shaped inner tube for quenching directly into an oil bath located underneath.
  • Another embodiment of the device according to the invention has a sieve box, in the interior of which there is a sieve which executes shaking or oscillating movements by mechanical excitation.
  • the sieve can either be separately vibrated or vibrated movements or the sieve box is stimulated overall to vibrate or vibrate.
  • the contents of the furnace system are preferably filled into the sieve box through a filler neck. The material to be treated falls directly from the sieve box into the oil bath.
  • the treatment medium falls through the sieve and the bulk material is conveyed to an outlet opening by means of conveying devices and, after exiting the system, is placed in an oil bath.
  • FIG. 1 This is a double-walled tube that can be attached directly to the rotary oven.
  • the inner tube is designed as a sieve and rotatably mounted. It is connected directly to the turning retort by means of a coupling and is set in rotation by it.
  • the treatment medium falls through the sieve into the outer tube and moves there to the lower opening, from which it is emptied into a box which can be flooded with protective gas in order to protect the treatment medium from oxidation.
  • the bulk material moves towards the end of the inner tube due to the inclination of the furnace and the rotary movement of the inner tube.
  • the material to be treated emerges there and falls into the oil bath.
  • the entire device is flooded with two gas feeds on the outer jacket with protective gas (nitrogen, argon) to prevent oxidation.
  • FIG. 2 An alternative embodiment is shown in FIG. 2.
  • This version of the device again consists of a double-walled tube which is mounted in an inclined state on a mobile frame.
  • the inner tube is again designed as a sieve and rotatably mounted. It is rotated by a drive attached to the frame.
  • the contents of the furnace consisting of the parts to be treated and the treatment medium (powder or granulate), are emptied into the hopper of the system.
  • the material to be separated enters the inner tube from the hopper.
  • the treatment medium is sieved off by the rotary movement and falls through the sieve into the outer tube and moves there towards the lower opening, from which it is emptied into a box which can be flooded with protective gas in order to protect the treatment medium from oxidation.
  • the bulk material moves towards the end of the inner tube due to the inclination of the system and the rotary movement of the inner tube.
  • the material to be treated emerges there and falls into the oil bath.
  • the double-walled pipe is flooded with protective gas (nitrogen, argon) through two gas inlets on the outer jacket to prevent oxidation of the material to be treated.
  • FIG. 3 Another embodiment is shown in FIG. 3.
  • This device is a closed mobile sieve box, in the interior of which a sieve is installed in an inclined position.
  • the contents of the furnace are filled in via the filler neck.
  • the material falls onto the sieve, which makes a shaking or swinging movement. This is generated by either energizing the sieve alone or by vibrating the sieve box as a whole.
  • the sieve box is mounted on rubber buffers or springs. Due to the shaking or swinging movement, the treatment medium falls through the sieve into the lower part of the box.
  • the thermochemically treated bulk material moves downwards on the inclined sieve and is emptied into the oil bath through an opening.
  • the entire sieve box is flooded with protective gas by means of gas inlets in order to avoid oxidation of bulk material and treatment medium.

Landscapes

  • 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)
  • Muffle Furnaces And Rotary Kilns (AREA)

Abstract

Un procédé pour durcir des matériaux en vrac directement après leur traitement thermochimique dans un four est caractérisé en ce que le matériau en vrac est séparé d'un milieu de traitement constitué de poudres ou de granulés tandis que le four est vidé, les matériaux en vrac traités tombent directement dans un bain d'huile et le milieu de traitement est transféré dans un récipient.
PCT/EP1999/004350 1998-06-23 1999-06-23 Dispositif pour durcir des materiaux en vrac apres leur traitement thermochimique dans des poudres ou des granules WO1999067432A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19827804.7 1998-06-23
DE1998127804 DE19827804A1 (de) 1998-06-23 1998-06-23 Vorrichtung zum Härten von Schüttgütern nach der thermochemischen Behandlung in Pulvern oder Granulaten

Publications (1)

Publication Number Publication Date
WO1999067432A1 true WO1999067432A1 (fr) 1999-12-29

Family

ID=7871671

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/004350 WO1999067432A1 (fr) 1998-06-23 1999-06-23 Dispositif pour durcir des materiaux en vrac apres leur traitement thermochimique dans des poudres ou des granules

Country Status (2)

Country Link
DE (1) DE19827804A1 (fr)
WO (1) WO1999067432A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104755635A (zh) * 2012-10-04 2015-07-01 雷诺两合公司 用于粉末形式材料的热处理装置以及对应的热处理方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1042684A (en) * 1964-03-13 1966-09-14 Pacific Scientific Co Heat treating furnace
DE2738288A1 (de) * 1977-08-25 1979-03-08 Degussa Drehrohrofenanlage zur waermebehandlung und abschreckung von bauteilen
US4154574A (en) * 1976-02-03 1979-05-15 Stone-Platt Fluidfire Limited Apparatus for treating workpieces in a bed of particles
EP0514325A2 (fr) * 1991-05-17 1992-11-19 HILTI Aktiengesellschaft Installation de transport du type tambour tournant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1042684A (en) * 1964-03-13 1966-09-14 Pacific Scientific Co Heat treating furnace
US4154574A (en) * 1976-02-03 1979-05-15 Stone-Platt Fluidfire Limited Apparatus for treating workpieces in a bed of particles
DE2738288A1 (de) * 1977-08-25 1979-03-08 Degussa Drehrohrofenanlage zur waermebehandlung und abschreckung von bauteilen
EP0514325A2 (fr) * 1991-05-17 1992-11-19 HILTI Aktiengesellschaft Installation de transport du type tambour tournant

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104755635A (zh) * 2012-10-04 2015-07-01 雷诺两合公司 用于粉末形式材料的热处理装置以及对应的热处理方法

Also Published As

Publication number Publication date
DE19827804A1 (de) 1999-12-30

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