EP0662519B1 - Apparatus for heat treating workpieces - Google Patents
Apparatus for heat treating workpieces Download PDFInfo
- Publication number
- EP0662519B1 EP0662519B1 EP94111942A EP94111942A EP0662519B1 EP 0662519 B1 EP0662519 B1 EP 0662519B1 EP 94111942 A EP94111942 A EP 94111942A EP 94111942 A EP94111942 A EP 94111942A EP 0662519 B1 EP0662519 B1 EP 0662519B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bottom part
- batch
- shaft
- heating unit
- disposed
- 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
Links
- 238000010438 heat treatment Methods 0.000 claims description 29
- 239000007789 gas Substances 0.000 claims description 11
- 239000002826 coolant Substances 0.000 claims description 6
- 239000000112 cooling gas Substances 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims 2
- 238000000151 deposition Methods 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 239000000523 sample Substances 0.000 claims 1
- 238000009413 insulation Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Images
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
- 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
- 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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/613—Gases; Liquefied or solidified normally gaseous material
-
- 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
- C21D9/0037—Rotary furnaces with vertical axis; Furnaces with rotating floor
Definitions
- the invention relates to a device for heat treatment of workpieces, especially one with hydrogen gas operated as cooling gas under excess pressure Furnace for hardening metallic workpieces, with a die Heating chamber for receiving the workpiece batch including housing connected to a vacuum pump with gas inlet and opening into the heating chamber Gas outlet openings, an engine-blower unit, the Blower wheel circulates the cooling gas and a heating unit.
- the device is for this with a lockable steel container and one inner heating chamber to hold the batch and with a gas blower and a gas guide device for generation a circulation flow through the heating chamber.
- the essentially circular cylindrical steel container is supported on a fixed support structure, with its longitudinal axis aligned vertically is and with a top supported by its Lower part can be lifted off.
- the batch itself rests a support frame, which in turn is on the housing cover the lower part is supported.
- a disadvantage of the known device is the uneven Heating and cooling of the batch, especially as a result of only in the middle Housing part arranged heating elements and only the Batch flowing in one direction and peripherally Cooling gas flow.
- the present invention is based on the object to create a device that has the disadvantages of the known Avoids device so that e.g. also rotationally symmetrical thin-walled workpieces on their True to form, highest demands are made, heat-treated can be without a subsequent post-treatment because of possible warping or cracking of the workpieces becomes necessary.
- the invention allows a wide variety of design options to; one of them is in the attached drawing shown in more detail, which the partial section through the lower part of the vacuum chamber of an industrial furnace Heat treatment of metallic workpieces shows, where on lower housing cover of the vacuum chamber of the rotatable Table arranged for the workpieces to be treated is.
- a vacuum heat treatment furnace of the one in question Art usually consists of a hollow cylindrical Housing, one end wall of which can be closed by a cover is, one on the other end wall of the housing arranged blower motor with impeller, one Hollow cylindrical batch chamber arranged inside the housing with a batch basket that can be used in this or support grid, in or towards which in turn treating workpieces can be placed, several to the immediate vicinity of the support grate extending, aligned parallel to the longitudinal axis of the housing Heating pipes, one between the blower motor and the support grid provided in the interior of the housing Blower housing and one in the annulus between the inside wall of the housing and the outside wall of the batch chamber housed from one of a refrigerant flow through existing coil.
- the heat treatment furnace is usually over one Suction line connected to a vacuum pump, the Suction nozzle opens into a chimney, the suction line can be shut off by an evacuation valve.
- the gas inlet lines a which are connected to gas containers and in the Valves are turned on through the two lines are lockable.
- the illustration shows only the lower housing cover 3, which rests on a frame, of which only one of the Supports 4 is shown and that with a bearing ring 5 is firmly welded, on which a support bearing 6 is arranged is (ball slewing ring), on which in turn the Bottom part 7 of the rotatable batch table 8 rests.
- the Batch table 8 is with slip rings on its underside 9, 10 provided with the current contacts 11, 12 correspond, the brackets 13, 14 firmly with the Housing cover 3 are connected and formed are that the upper end faces of the current contacts 11, 12 with a certain preload on the slip rings 9, 10 concern.
- the bottom of the bottom part 7 of the batch table 8 has a bearing pin 15 which is sealed against the bearing ring 5 and after below is extended by a shaft 16 on which the Pulley 17 is arranged rotatably, the over a toothed belt 18 or drive chain with the pulley 20 of the motor gear unit 19 is connected, so that with the help of the motor gear unit 19 (with Three-phase motor) of the batch table 8 around the axis A in Rotation can be offset.
- the shaft 16 is around a Pipe section 21, 49 extended with a fixed Bearing 22 is rotatably connected via a support 23, on which a centering rod 24 is mounted, which is passed through an inner tube 25 and the causes the inner tube 25 not together with the shaft 16 or the journal 15 and the bottom part 7 turns.
- the bottom part is 7th provided with a cavity 26 which is connected to the inner tube 25 is in communication, so that on the connecting piece 27 in the annular space between the inner tube 25 and the Longitudinal bore 30 in the pipe section 21 upward flowing cooling water also the cavity 26 in the bottom part 7 for the purpose flows through the cooling of the batch table 8 (rotatable Cooling water duct). That returned from the cavity 26 Coolant flows through the inner tube 25 and exits at the connecting piece 31 again.
- On the Top of the bottom part 7 of the batch table 8 are a plurality of supports 32, 32 ', ... made of graphite or Ceramics attached, which in turn bearing pieces 33, 33 ', ... hold onto the rods 34, 34 ', ...
- the two connecting rods 39, 40 extend further vertical holding arms 41, 42, which are firmly on the bottom part 7 are anchored and each have an insulation plate Hold 43 or 44 in a plane that is parallel to the Level of the bottom part 7 extends. Furthermore is on the Bottom part 7 a bracket 45 attached to the bearing pieces 33, 33 ', ... keeps a distance from each other. Finally, two sensors 46, 47 are on the bearing ring 5 ' provided, the sliding contacts not shown with parts arranged on the bottom part 7 communicate with the device so that the temperature measurable at different locations of the device is.
- the insulation plate 43 (Graphite hard felt insulation) with a central opening 50 is provided, which a flow of the cooling gas of bottom up through the batch table 8 and thus also by the on the of the rods 34, 34 ', ... formed rust allows deposited workpieces.
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)
- Furnace Details (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
- Heat Treatment Of Articles (AREA)
Description
Die Erfindung betrifft eine Vorrichtung zur Wärmebehandlung von Werkstücken, insbesondere einen mit Wasserstoffgas als Kühlgas unter Überdruck betriebenen Ofen zum Härten metallischer Werkstücke, mit einem die Heizkammer zur Aufnahme der Werkstückcharge einschließenden, an eine Vakuumpumpe angeschlossenen Gehäuse mit in die Heizkammer einmündende Gaseinlaß- und Gasauslaßöffnungen, einer Motor-Gebläse-Einheit, deren Gebläserad das Kühlgas umwälzt und einem Heizaggregat. The invention relates to a device for heat treatment of workpieces, especially one with hydrogen gas operated as cooling gas under excess pressure Furnace for hardening metallic workpieces, with a die Heating chamber for receiving the workpiece batch including housing connected to a vacuum pump with gas inlet and opening into the heating chamber Gas outlet openings, an engine-blower unit, the Blower wheel circulates the cooling gas and a heating unit.
Es ist ein Vakuumofen zur Wärmebehandlung einer Charge aus metallischen Werkstücken bekannt (DOS 34 16 902), bei dem der Behälter nach dem Einsetzen der Charge evakuiert und mit Schutzgas geflutet wird, wobei die Charge anschließend durch Heizen und durch Gasumwälzung bis auf die maximal zulässige Arbeitstemperatur der Umwälzeinrichtung erwärmt wird und hiernach mit ruhendem Schutzgas oder unter Vakuum im wesentlichen durch Strahlungswärme auf eine gewünschte Endtemperatur der Wärmebehandlung erwärmt wird. Die Vorrichtung ist dazu mit einem verschließbaren Stahlbehälter und einer inneren Heizkammer zur Aufnahme der Charge und mit einem Gasgebläse sowie einer Gasleiteinrichtung zur Erzeugung einer Umwälzströmung durch die Heizkammer versehen. Der im wesentlichen kreiszylindrische Stahlbehälter ist auf einer ortsfesten Trägerkonstruktion abgestützt, wobei seine Längsachse lotrecht ausgerichtet ist und wobei ein Oberteil von seinem abgestützten Unterteil abhebbar ist. Die Charge selbst ruht auf einem Traggestell, das seinerseits auf dem Gehäusedeckel des Unterteils abgestützt ist.It is a vacuum furnace for heat treatment of a batch known from metallic workpieces (DOS 34 16 902), where the container evacuates after the batch is inserted and is flooded with protective gas, the Batch then by heating and by gas circulation up to the maximum permissible working temperature of the circulating device is heated and then with resting Shielding gas or under vacuum essentially through Radiant heat to a desired final temperature Heat treatment is heated. The device is for this with a lockable steel container and one inner heating chamber to hold the batch and with a gas blower and a gas guide device for generation a circulation flow through the heating chamber. The essentially circular cylindrical steel container is supported on a fixed support structure, with its longitudinal axis aligned vertically is and with a top supported by its Lower part can be lifted off. The batch itself rests a support frame, which in turn is on the housing cover the lower part is supported.
Ein Nachteil der bekannten Vorrichtung ist die ungleichmäßige Aufheizung und auch Abkühlung der Charge, insbesondere infolge der nur im Bereich des mittleren Gehäuseteils angeordneten Heizelemente und des nur die Charge in einer Richtung und peripher umströmenden Kühlgasstrom.A disadvantage of the known device is the uneven Heating and cooling of the batch, especially as a result of only in the middle Housing part arranged heating elements and only the Batch flowing in one direction and peripherally Cooling gas flow.
In JP-A-61 243 115 ist eine Wärmebehandlungsvorrichtung mit den
Merkmalen des Oberbegriffes von Anspruch 1 beschrieben, welche
ähnliche Nachteile aufweist.JP-A-61 243 115 discloses a heat treatment device with the
Features of the preamble of
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zu schaffen, die die Nachteile der bekannten Vorrichtung vermeidet, so daß z.B. auch rotationssymmetrische dünnwandige Werkstücke an deren Formtreue höchste Ansprüche gestellt werden, wärmebehandelt werden können, ohne daß eine spätere Nachbehandlung wegen des möglichen Verzugs oder der Rißbildung der Werkstücke notwendig wird.The present invention is based on the object to create a device that has the disadvantages of the known Avoids device so that e.g. also rotationally symmetrical thin-walled workpieces on their True to form, highest demands are made, heat-treated can be without a subsequent post-treatment because of possible warping or cracking of the workpieces becomes necessary.
Diese Aufgabe wird erfindungsgemäß gelöst durch die Merkmale
des Anspruchs 1. Auf dem um eine vertikale
Achse drehbaren Bodenteil sind das
Heizaggregat
und ein oberhalb des Heizaggregats vorgesehener,
aus Stäben gebildeter Rost zur Ablage der Werkstückcharge,
sowie unterhalb des Heizaggregats
mindestens eine Isolierplatte angeordnet.This object is achieved according to the invention by the features
of
Weitere Einzelheiten und Merkmale der Erfindung sind in den Patentansprüchen näher beschrieben und gekennzeichnet.Further details and features of the invention are in described and characterized in more detail in the claims.
Die Erfindung läßt die verschiedensten Ausführungsmöglichkeiten zu; eine davon ist in der anliegenden Zeichnung näher dargestellt, die den Teilschnitt durch den unteren Teil der Vakuumkammer eines Industrieofens zur Wärmebehandlung metallischer Werkstücke zeigt, wobei am unteren Gehäusedeckel der Vakuumkammer der drehbare Tisch für die zu behandelnden Werkstücke angeordnet ist.The invention allows a wide variety of design options to; one of them is in the attached drawing shown in more detail, which the partial section through the lower part of the vacuum chamber of an industrial furnace Heat treatment of metallic workpieces shows, where on lower housing cover of the vacuum chamber of the rotatable Table arranged for the workpieces to be treated is.
Ein Vakuum-Wärmebehandlungsofen der infragestehenden Art besteht üblicherweise aus einem hohlzylindrischen Gehäuse, dessen eine Stirnwand von einem Deckel verschließbar ist, einem an der anderen Stirnwand des Gehäuses angeordneten Gebläsemotor mit Gebläserad, einer im Gehäuseinnern angeordneten hohlzylindrischen Chargenkammer mit einem in diese einsetzbaren Chargenkorb oder Auflagerost, in den bzw. auf das wiederum die zu behandelnden Werkstücke auflegbar sind, mehreren sich bis in die unmittelbare Nachbarschaft des Auflagerostes erstreckenden, parallel zur Gehäuselängsachse ausgerichteten Heizrohren, einem zwischen dem Gebläsemotor und dem Auflagerost im Innenraum des Gehäuses vorgesehenen Gebläsegehäuse und einem im Ringraum zwischen der Innenwand des Gehäuses und der Außenwand der Chargenkammer untergebrachten, aus einer von einem Kältemittel durchströmten Rohrschlange bestehenden Wärmetauscher.A vacuum heat treatment furnace of the one in question Art usually consists of a hollow cylindrical Housing, one end wall of which can be closed by a cover is, one on the other end wall of the housing arranged blower motor with impeller, one Hollow cylindrical batch chamber arranged inside the housing with a batch basket that can be used in this or support grid, in or towards which in turn treating workpieces can be placed, several to the immediate vicinity of the support grate extending, aligned parallel to the longitudinal axis of the housing Heating pipes, one between the blower motor and the support grid provided in the interior of the housing Blower housing and one in the annulus between the inside wall of the housing and the outside wall of the batch chamber housed from one of a refrigerant flow through existing coil.
Der Wärmebehandlungsofen ist in der Regel über eine Saugleitung an eine Vakuumpumpe angeschlossen, deren Absaugstutzen in einen Kamin einmündet, wobei die Saugleitung durch ein Evakuierventil absperrbar ist. In das hohlzylindrische Gehäuse münden die Gas-Einlaßleitungen ein, die mit Gasbehältern verbunden sind und in die Ventile eingeschaltet sind, über die die beiden Leitungen absperrbar sind.The heat treatment furnace is usually over one Suction line connected to a vacuum pump, the Suction nozzle opens into a chimney, the suction line can be shut off by an evacuation valve. In the hollow cylindrical housings open the gas inlet lines a, which are connected to gas containers and in the Valves are turned on through the two lines are lockable.
Die Abbildung zeigt nur den unteren Gehäusedeckel 3,
der auf einem Gestell ruht, von dem nur eine der
Stützen 4 dargestellt ist und der mit einem Lagerring 5
fest verschweißt ist, auf dem ein Traglager 6 angeordnet
ist (Kugeldrehverbindung), auf dem wiederum das
Bodenteil 7 des drehbaren Chargentischs 8 aufliegt. Der
Chargentisch 8 ist an seiner Unterseite mit Schleifringen
9, 10 versehen, die mit Stromkontakten 11, 12
korrespondieren, deren Halterungen 13, 14 fest mit dem
Gehäusedeckel 3 verbunden sind und die so ausgebildet
sind, daß die oberen Stirnflächen der Stromkontakte 11,
12 mit einer bestimmten Vorspannung an den Schleifringen
9, 10 anliegen. Die Unterseite des Bodenteils 7
des Chargentischs 8 weist einen Lagerzapfen 15 auf, der
gegenüber dem Lagerring 5 abgedichtet ist und der nach
unten zu um eine Welle 16 verlängert ist, auf der die
Riemenscheibe 17 drehfest angeordnet ist, die über
einen Zahnriemen 18 oder Antriebskette mit der Riemenscheibe
20 der Motor-Getriebeeinheit 19 verbunden ist,
so daß mit Hilfe der Motor-Getriebeeinheit 19 (mit
Drehstrommotor) der Chargentisch 8 um die Achse A in
Drehung versetzt werden kann. Die Welle 16 ist um ein
Rohrstück 21, 49 verlängert, das mit einem ortsfesten
Lager 22 über eine Stütze 23 drehfest verbunden ist,
auf dem im übrigen ein Zentrierstab 24 gelagert ist,
der durch ein Innenrohr 25 hindurchgeführt ist und der
bewirkt, daß sich das Innenrohr 25 nicht zusammen mit
der Welle 16 bzw. dem Lagerzapfen 15 und dem Bodenteil
7 dreht. Wie die Zeichnung zeigt, ist das Bodenteil 7
mit einem Hohlraum 26 versehen, der mit dem Innenrohr
25 in Verbindung steht, so daß das am Anschlußstutzen
27 in den Ringraum zwischen dem Innenrohr 25 und der
Längsbohrung 30 im Rohrstück 21 aufwärtsströmende Kühlwasser
auch den Hohlraum 26 im Bodenteil 7 zum Zwecke
der Kühlung des Chargentisches 8 durchströmt (drehbare
Kühlwasserdurchführung). Das aus dem Hohlraum 26 zurückgeführte
Kühlmittel strömt durch das Innenrohr 25
und tritt am Anschlußstutzen 31 wieder aus. Auf der
Oberseite des Bodenteils 7 des Chargentischs 8 sind
eine Vielzahl von Stützen 32, 32', ... aus Graphit oder
Keramik befestigt, die wiederum Lagerstücke 33, 33',
... halten, auf die ihrerseits jeweils Stäbe 34, 34',
... aus hochhitzefestem und korrosionsfestem Werkstoff
aufliegen, auf denen die zu behandelnden Werkstücke ablegbar
sind. Parallel zu den Stützen 32, 32', ... sind
jeweils Haltearme 35, 35', ... auf dem Bodenteil angebracht,
deren obere Enden als Gabeln 36, 36', ... ausgebildet
sind, in denen sich zueinander parallel erstreckende
Heizstäbe 37, 37', ... lagern, die über
Stromleiter 38, 38', ... miteinander in Verbindung
stehen bzw. an die mit den Schleifringen 9, 10 korrespondierenden
stromleitenden Verbindungsstäbe 39, 40
(Kohlegleitkontakte) angeschlossen sind. Parallel der
beiden Verbindungsstäbe 39, 40 erstrecken sich weitere
lotrechte Haltearme 41, 42, die fest auf dem Bodenteil
7 verankert sind und die jeweils eine Isolationsplatte
43 bzw. 44 in einer Ebene halten, die sich parallel der
Ebene des Bodenteils 7 erstreckt. Weiterhin ist auf dem
Bodenteil 7 ein Haltearm 45 befestigt, der die Lagerstücke
33, 33', ... im Abstand zueinander hält.
Schließlich sind zwei Meßfühler 46, 47 am Lagerring 5'
vorgesehen, die über nicht näher dargestellte Schleifkontakte
mit auf dem Bodenteil 7 angeordneten Teilen
der Vorrichtung in Verbindung stehen, so daß die Temperatur
an unterschiedlichen Orten der Vorrichtung meßbar
ist. Es sei noch erwähnt, daß die Isolationsplatte 43
(Graphithartfilzisolation) mit einer zentralen Öffnung
50 versehen ist, die ein Durchströmen des Kühlgases von
unten nach oben durch den Chargentisch 8 und damit auch
durch die auf dem von den Stäben 34, 34', ...
gebildeten Rost abgelegten Werkstücke ermöglicht. The illustration shows only the
- 22nd
- Gehäusecasing
- 33rd
- GehäusedeckelHousing cover
- 44th
- Stützesupport
- 5, 5'5, 5 '
- LagerringBearing ring
- 66
- TraglagerSupport bearing
- 77
- BodenteilBottom part
- 88th
- ChargentischBatch table
- 99
- SchleifringSlip ring
- 1010th
- SchleifringSlip ring
- 1111
- Stromkontakt, SchleifkontaktCurrent contact, sliding contact
- 1212th
- Stromkontakt, SchleifkontaktCurrent contact, sliding contact
- 1313
- Halterungbracket
- 1414
- Halterungbracket
- 1515
- LagerzapfenBearing journal
- 1616
- WellenstumpfWave stump
- 1717th
- RiemenscheibePulley
- 1818th
- ZahnriemenTiming belt
- 1919th
- Motor-GetriebeeinheitMotor gear unit
- 2020th
- RiemenscheibePulley
- 2121
- RohrstückePipe pieces
- 2222
- Lagercamp
- 2323
- Stützesupport
- 2424th
- ZentrierstabCentering rod
- 2525th
- InnenrohrInner tube
- 2626
- Hohlraumcavity
- 2727
- AnschlußstutzenConnecting piece
- 2929
- Ringraum, KanalAnnulus, channel
- 3030th
- LängsbohrungLongitudinal bore
- 3131
- AnschlußstutzenConnecting piece
- 32, 32', ...32, 32 ', ...
- Stützesupport
- 33, 33', ...33, 33 ', ...
- Stab, RostRod, rust
- 34, 34', ...34, 34 ', ...
- StabRod
- 35, 35', ..35, 35 ', ..
- Haltearm Holding arm
- 36, 36', ...36, 36 ', ...
- Gabelfork
- 37, 37', ...37, 37 ', ...
- HeizstabHeating element
- 38, 38', ...38, 38 ', ...
- StromleiterConductor
- 3939
- VerbindungsstabConnecting rod
- 4040
- VerbindungsstabConnecting rod
- 4141
- HaltearmHolding arm
- 4242
- HaltearmHolding arm
- 4343
- IsolationsplatteInsulation plate
- 4444
- IsolationsplatteInsulation plate
- 4545
- HaltearmHolding arm
- 4646
- MeßfühlerSensor
- 4747
- MeßfühlerSensor
- 4848
- Kanalchannel
- 4949
- Hülse, RohrstückSleeve, pipe section
- 5050
- Öffnungopening
Claims (6)
- Apparatus for heat treating workpieces, in particular a furnace for hardening metal workpieces which is operated with hydrogen gas as the cooling gas under superatmospheric pressure, the said apparatus having a casing (2) which encloses the heating chamber for receiving the batch of workpieces, is connected to a vacuum pump and can be opened via a casing cover (3) and which has gas inlet and gas outlet apertures opening into the heating chamber, a motor/blower unit, the impeller of which circulates the cooling gas, and a heating unit (37, 37', ...) and also a bottom part (7) of a batch table (8), which bottom part is mounted on the casing cover (3) and can be rotated about a vertical axis (A), the bottom part (7) being connected, on its underside, to a bearing journal (15) which passes, in a sealed-off manner, through a bearing ring (5) on the casing cover (3) and is coupled, via a shaft (16), to a motor drive (19) via which the bottom part (7) and, with it, the batch table (8) can be rotated, characterised in that the heating unit (37, 37', ...) is disposed on the said bottom part (7), with a grid for depositing the batch of workpieces, which grid is provided above the heating unit (37, 37', ...) and is formed from bars (33, 33', ... and 34, 34', ...), at least one insulating plate (43, 44) being disposed underneath the heating unit (37, 37', ...).
- Apparatus according to claim 1, characterised in that the bottom part (7) of the batch table (8) is provided with hollow spaces (26) or cooling ducts through which a coolant flows, the hollow spaces (26) or ducts corresponding, via central flow paths (29, 48) which extend parallel to the shaft (16) and in its interior, with the connections (27, 31) for the supply of coolant.
- Apparatus according to claim 1, characterised in that the underside of the bottom part (7) of the batch table (8) is provided with contact tracks or slip rings (9, ...) which interact with slip contacts (11, 12) which pass through the casing cover (3) in an insulated manner and via which the heating unit (37, 37', ...) can be connected to an electrical heating-current source.
- Apparatus according to one or more of the preceding claims, characterised in that the shaft (16) prolongs the bearing journal (15) in the downward direction and is provided with a central longitudinal bore (30), there being disposed in the said longitudinal bore (30) an inner tube (25) which extends coaxially with the latter and separates an outer annular duct (29), through which coolant flows, from a central duct (48) through which coolant likewise flows.
- Apparatus according to one or more of the preceding claims, characterised in that the bearing ring (5, 5') has bores through which measuring probes (46, 47) or their current conductors are passed in a sealed-off manner, those ends of the said current conductors (46, 47) which face towards the batch table (8) in each case interacting with slip rings which are disposed in an insulated manner on the underside of the bottom part (7) and, for their part, are connected either to sensors disposed in the vicinity of the heating unit (37, 37', ...) or else directly to sensors which protrude into the hollow spaces (26) or ducts for the coolant.
- Apparatus according to one or more of the preceding claims, characterised in that there is disposed, coaxially with the shaft (16) of the bottom part (7), a centring bar (24) whose lower end which faces away from the batch table (8) is supported on a stationary bearing pedestal (22), the lower end of the centring bar (24) being passed in a sealed-off manner through the lower end of a sleeve (21, 49) which is to prolong the shaft (16) in the downward direction and is held in a torsion-proof manner on the bearing pedestal (22), and the upper end of the centring bar (24) being bent at right angles and being connected to the shaft (16) in a torsion-proof manner.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4400326A DE4400326C2 (en) | 1994-01-07 | 1994-01-07 | Device for hardening metallic workpieces |
| DE4400326 | 1994-01-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0662519A1 EP0662519A1 (en) | 1995-07-12 |
| EP0662519B1 true EP0662519B1 (en) | 2000-05-31 |
Family
ID=6507572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94111942A Expired - Lifetime EP0662519B1 (en) | 1994-01-07 | 1994-07-30 | Apparatus for heat treating workpieces |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5478057A (en) |
| EP (1) | EP0662519B1 (en) |
| DE (2) | DE4400326C2 (en) |
| NL (1) | NL194675C (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9704229D0 (en) * | 1997-02-28 | 1997-04-16 | Mckechnie Plc | Fastener installing machine |
| US5934871A (en) * | 1997-07-24 | 1999-08-10 | Murphy; Donald G. | Method and apparatus for supplying a anti-oxidizing gas to and simultaneously cooling a shaft and a fan in a heat treatment chamber |
| CN103836893B (en) * | 2012-11-21 | 2016-12-21 | 神华集团有限责任公司 | Drying furnace or pyrolyzing furnace with rotary material bed |
| CN105112612A (en) * | 2015-09-06 | 2015-12-02 | 重庆赛迪热工环保工程技术有限公司 | Bell furnace platform |
| CN105755219B (en) * | 2016-03-14 | 2018-01-19 | 浙江沪新不锈钢制造有限公司 | Natural gas annealing furnace |
| CN109943702A (en) * | 2018-03-08 | 2019-06-28 | 王德伟 | Rolling quenching system |
| CN112981051B (en) * | 2020-12-24 | 2024-03-29 | 无锡市博伟锻造有限公司 | Heat treatment method before finish machining of forged workpiece for petroleum blowout prevention equipment |
| CN113444862A (en) * | 2021-06-18 | 2021-09-28 | 江苏奥威机械有限公司 | Baking equipment is used in gate valve production of being heated evenly |
| US11971216B1 (en) | 2021-12-23 | 2024-04-30 | Rolls-Royce High Temperature Composites, Inc. | Retort with loading window |
| CN114438291B (en) * | 2022-01-12 | 2024-04-05 | 重庆市璧山汇泰机械有限责任公司 | Cooling device after normalizing treatment of gear blanks |
| CN114891959B (en) * | 2022-05-11 | 2023-03-17 | 兴化市剑达铸造有限公司 | Cooling device for metal heat treatment processing |
| CN115747460B (en) * | 2022-11-21 | 2024-08-06 | 浙江新春宇航轴承有限公司 | Quenching system and quenching process of bearing ring |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US804883A (en) * | 1901-09-06 | 1905-11-21 | Ruggles Coles Engineering Company | Furnace. |
| US931663A (en) * | 1903-11-02 | 1909-08-17 | Libbey Glass Co | Furnace. |
| US4102637A (en) * | 1976-09-16 | 1978-07-25 | Abar Corporation | Work support for vacuum electric furnaces |
| SU1129251A1 (en) * | 1981-09-22 | 1984-12-15 | Институт черной металлургии | Hood furnace stand |
| DE3416902A1 (en) * | 1984-05-08 | 1985-11-14 | Schmetz Industrieofenbau und Vakuum-Hartlöttechnik KG, 5750 Menden | METHOD AND VACUUM OVEN FOR HEAT TREATING A BATCH |
| US4604056A (en) * | 1985-03-01 | 1986-08-05 | Jones William R | Vacuum furnace system hearth |
| JPS61243115A (en) * | 1985-04-18 | 1986-10-29 | Daido Steel Co Ltd | Vacuum heat treatment device |
| DE3518347C1 (en) * | 1985-05-22 | 1986-12-04 | Ruhrgas Ag, 4300 Essen | Furnace for heat treatment of work pieces |
| DE3818471A1 (en) * | 1988-05-31 | 1989-12-21 | Ipsen Ind Int Gmbh | OVEN FOR HEAT TREATMENT OF IRON AND STEEL PARTS |
| JPH04362121A (en) * | 1991-06-07 | 1992-12-15 | Nissin Electric Co Ltd | Heat treating and coating device |
| DE4312627A1 (en) * | 1993-04-19 | 1994-10-20 | Hauzer Holding | Method and device for heat treatment of objects |
-
1994
- 1994-01-07 DE DE4400326A patent/DE4400326C2/en not_active Expired - Lifetime
- 1994-07-30 EP EP94111942A patent/EP0662519B1/en not_active Expired - Lifetime
- 1994-07-30 DE DE59409387T patent/DE59409387D1/en not_active Expired - Lifetime
- 1994-09-29 NL NL9401597A patent/NL194675C/en not_active IP Right Cessation
- 1994-12-14 US US08/355,551 patent/US5478057A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US5478057A (en) | 1995-12-26 |
| DE59409387D1 (en) | 2000-07-06 |
| DE4400326C2 (en) | 2002-10-31 |
| NL9401597A (en) | 1995-08-01 |
| NL194675B (en) | 2002-07-01 |
| EP0662519A1 (en) | 1995-07-12 |
| DE4400326A1 (en) | 1995-07-13 |
| NL194675C (en) | 2002-11-04 |
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