EP0922120B1 - Rundtaktofen zum behandeln von werkstücken - Google Patents

Rundtaktofen zum behandeln von werkstücken Download PDF

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Publication number
EP0922120B1
EP0922120B1 EP97934473A EP97934473A EP0922120B1 EP 0922120 B1 EP0922120 B1 EP 0922120B1 EP 97934473 A EP97934473 A EP 97934473A EP 97934473 A EP97934473 A EP 97934473A EP 0922120 B1 EP0922120 B1 EP 0922120B1
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EP
European Patent Office
Prior art keywords
lock
rotor
batch
furnace
workpieces
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
EP97934473A
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German (de)
English (en)
French (fr)
Other versions
EP0922120A1 (de
Inventor
Franz Hillingrathner
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Hillingrathner Franz
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Individual
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Filing date
Publication date
Priority claimed from DE1996135257 external-priority patent/DE19635257C1/de
Priority claimed from DE1996138106 external-priority patent/DE19638106C1/de
Priority claimed from DE1996139933 external-priority patent/DE19639933C1/de
Application filed by Individual filed Critical Individual
Publication of EP0922120A1 publication Critical patent/EP0922120A1/de
Application granted granted Critical
Publication of EP0922120B1 publication Critical patent/EP0922120B1/de
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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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
    • F27B9/045—Furnaces with controlled atmosphere
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/16—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/0024—Charging; Discharging; Manipulation of charge of metallic workpieces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
    • F27B9/021—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces having two or more parallel tracks
    • F27B9/025—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces having two or more parallel tracks having two or more superimposed tracks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0001—Positioning the charge
    • F27D2003/0006—Particulate materials
    • F27D2003/0007—Circular distribution
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
    • F27D2003/0046—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities comprising one or more movable arms, e.g. forks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
    • F27D2003/0065—Lifts, e.g. containing the bucket elevators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
    • F27D2007/063—Special atmospheres, e.g. high pressure atmospheres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/0002—Cooling of furnaces
    • F27D2009/0005—Cooling of furnaces the cooling medium being a gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/007—Cooling of charges therein
    • F27D2009/0089—Quenching
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0073—Seals
    • F27D2099/0078—Means to minimize the leakage of the furnace atmosphere during charging or discharging
    • F27D2099/008—Using an air-lock
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
    • F27M2003/00—Type of treatment of the charge
    • F27M2003/01—Annealing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
    • F27M2003/00—Type of treatment of the charge
    • F27M2003/07—Carburising

Definitions

  • Rotary cycle furnaces of this type are particularly suitable for heat treatments, for example for carburizing, nitriding, phosphating and / or hardening metallic workpieces.
  • a feed lock arranged outside the furnace housing is accessible through an entrance gate and separated from a heating chamber by a first intermediate gate, which in turn is separated from an equalizing chamber by a second intermediate gate.
  • the compensation chamber is attached radially on the outside of the furnace housing and separated from the furnace chamber by a third intermediate gate.
  • An output lock connects to the hardening furnace and is also set up to quench the workpieces heated to the hardening temperature in the hardening furnace.
  • This known arrangement takes up a relatively large amount of space for a given diameter of the furnace housing and requires considerable maintenance for the numerous gates required for the locks and further chambers.
  • the invention has for its object a rotary cycle oven for treating workpieces, especially for hardening and Tempering metallic workpieces in a cost and space saving way design and enable him to save time.
  • the rotary cycle furnace according to the invention be further developed in that the treatment rotor has at least two turntables which axially offset from each other, thermally insulated from each other and can be heated differently.
  • At least one secondary chamber a device for cooling each batch of workpieces contains or can be connected to such.
  • the facility a cooling device of known type can be used for cooling, for example a nitrogen shower, an oil bath or the like it is also possible to cool another workpiece Provide turntable.
  • the lock rotor is preferred trained to cool the workpieces.
  • a coolant channel can be arranged on the furnace housing over an arc corresponding to at least one step of the Lock rotor extends, separated from adjacent secondary chambers and with at least one along its length the lock chambers is connected.
  • a stationary one formed on the furnace housing and one trained on or with the lock rotor rotating sealing surface interact directly with each other allow; has a sealing ring arranged according to the invention however the advantage that it is a relatively soft intermediate member represents that is subject to wear and in contrast to produce relatively inexpensive to its two contact partners and can be exchanged quickly.
  • the sealing ring Compensate concentricity errors and thermal expansion, especially if the trained on the furnace housing and the lock rotor Sealing surfaces are converging and the sealing ring is conical has a corresponding wedge profile and in axial Direction is biased.
  • the invention Develop the rotary cycle oven in such a way that it is low Expenditure of energy and resources a particularly accurate dosed action on workpieces, especially those to be hardened Workpieces of low mass made of steel.
  • the rotary cycle furnace shown in Fig. 1 to 6 has a furnace housing 10 with an essentially cylindrical outer wall 12, an underbody 14 and an intermediate floor 16, which together enclose an evacuable furnace chamber 20, also with a Cover 18 and with a lower housing part 22, which with the outer wall 12 and the underbody 14 consists of one piece.
  • an upwardly projecting cylindrical Collar 24 formed in which by means of radially inner bearing 26th a hub 28 of a treatment rotor 30 around a vertical central one Axis A is rotatably mounted.
  • the treatment rotor 30 has as essential components an upper turntable 32 and a lower turntable 34, both of which are annular and numerous, in the example shown seventy-two, batch locations 36 or 38 have.
  • Each of the batch places 36 and 38 is made up of several horizontal, upright slats 40 formed, which are parallel to each other and essentially Extend radially from the central axis A and through a common annular bottom plate 42 held together are.
  • the treatment rotor 30 also includes three coaxially central axis A insulating plates 44 arranged one below the other, 46 and 48, with the upper batch locations 36 between the upper and the middle insulating plate 44 and 46, respectively, and the lower ones Batch places 38 between the middle and the lower insulating plate 46 and 48 are arranged such that on each Batch location a batch of workpieces to be treated W space Has.
  • the insulating plates 44, 46 and 48 are preferably composite plates, each made of two thin ceramic plates and three thick insulating plates are composed of hard graphite felt. All of the plates 42 to 48 mentioned are axially parallel Tie rod 49 rigidly but interchangeably connected to the hub 28.
  • the treatment rotor 30 thus constructed is by means of a Motor 50 can be driven in rotation about the central axis A step by step. Given the number of seventy-two chosen as an example Batch positions 36 and 38 on each of the two turntables 32 and 34, each step extends over 5 °. So that step size is strictly observed, the motor 50 is preferably a Servo motor with built-in, backlash-free reduction gear, for example cyclo transmission.
  • the batch locations 36 of the upper turntable 32 are between two annular heating discs concentric to the central axis A. 52 arranged for high temperature heating; in corresponding The batch locations 38 of the lower turntable are wise 34 between two heating disks 54 for low temperature heating arranged. All heating disks 52 and 54 are star-shaped according to the arrangement of batch locations 36 and 38 serrated, preferably consist of molybdenum or graphite and are connected to a via a central slip ring assembly 56 electrical power source connected. Below the slip ring arrangement 56 is the furnace housing 10 with a cup-shaped Closure 58 completed.
  • a lock rotor 60 is arranged in the furnace housing 10, which also on the collar 24 by means of outer bearings 62 stored and driven to rotate about the central axis A.
  • the Lock rotor 60 has several, six in the example shown, Lock chambers 64, which are at angular intervals of 60 ° to each other offset in a spoke-like part of the lock rotor formed and in the embodiment shown in Fig.1 to 6 are only open radially to the outside.
  • On the outside wall 12 of the furnace housing 10 are in the direction of rotation C against each other offset a first, second and third suction nozzle 66, 67 and 68 arranged to evacuate the lock chamber a suction pump can be connected.
  • Horizontal slats 70 are upright in each lock chamber 64 arranged, which are at the same mutual distance as the fins 40 parallel to one another essentially radially from extend away from the central axis A and through a base plate 72 are interconnected.
  • the bottom plates 72 of the lock rotor 60 as well as the bottom plates 42 of the treatment rotor 30 the task of vibrating the associated slats 70 or 40, especially with rapid acceleration or Braking the lock rotor 60 or treatment rotor 30, too prevent.
  • the fins 70 in each of the lock chambers 64 form a lock place 74 on which a batch of workpieces W is deductible.
  • each batch consists of five radially in a row arranged annular workpieces W, e.g. Ball bearing rings.
  • W e.g. Ball bearing rings.
  • the slats 40 and 70 as in Fig.5 on one of the slats 70 indicated, on their top with one Notch 75 provided so that each ball in notches two adjacent Slats can be safely accommodated.
  • the workpiece batches it is also possible to arrange the workpiece batches on a pallet.
  • the Lock rotor 60 there is a stationary one on the furnace housing 10 Sealing surface 76 formed in the shape of an inner cone, 5 has its smallest diameter at the bottom.
  • the Lock rotor 60 also has a conical outer sealing surface 78, which has its largest diameter below and preferably is ceramic coated. Between the sealing surfaces 76 and 78 a correspondingly conical sealing ring 80 is arranged, which in profile has the shape of a wedge tapering downwards has, preferably essentially made of graphitized coal or semi-crystalline thermoplastic (PEEK), and there is outer conical surface one on the stationary sealing surface 76 has adjacent elastomer coating, while it on the outer sealing surface 78 of the lock rotor 60 is in direct contact.
  • PEEK graphitized coal or semi-crystalline thermoplastic
  • the sealing ring 80 is attached to it by means of a to the central axis A parallel pin 82 which in a Recess 84 of the lid 18 engages, prevented from rotating and is axially downward by means of springs 86 supported on the cover 18 biased.
  • Passages 88 formed, which are at angular intervals of 60 ° to each other are offset and whenever the lock rotor 60 stands still, with one of the lock chambers 64 swear.
  • the lock rotor 60 is stepped by means of two motors 90 drivable; for the number of six lock chambers 64 extend over each step 60 °.
  • the two motors 90 preferably electric servomotors, are arranged offset from each other by 180 ° and have each a backlash-free reduction gear with a pinion 91, the free of play in a ring gear arranged on the lock rotor 60 92 engages.
  • the outer wall 12 of the furnace housing 10 is thermally insulated, e.g. with hard graphite felt, and points at the level of the lock rotor 60 six radial openings 94 offset from one another by 60 ° on, each with one of the passages 88 of the sealing ring 80th swear. In the area of one of the openings 94 is on the outer wall 12 of the furnace housing 10 radially from the outside a panel 96 grown, the height of the lock rotor 60 through Slots 98 open to the outside of the furnace housing 10 is.
  • a charger 100 is located inside the casing 96 Introducing and removing batches of workpieces in and out the lock chambers 64 arranged.
  • the charger 100 has one Lamellar comb 102, which is between each of the lock places 74 forming fins 70 of the lock rotor 60 fits.
  • the lamella comb 102 is slight along a vertical pivot axis B. can be raised and lowered and about this pivot axis B from one with respect to the central axis A radial position after both Directions, through one of the slots 98 of the panel 96 through, can be swiveled outwards by 90 ° and is on one Carriage 104 arranged radially to the central axis A is slidable to and from it.
  • a lift drive 105 For lifting and lowering a lift drive 105, a swivel drive 106 for pivoting, and a displacement drive 108 is provided for radial displacement; these three drives can also each have an electric servo motor exhibit.
  • Each of the total of five transfer devices 112 has one Slat comb 114, which corresponds to the slat comb 102, however in contrast to this, always arranged radially, for that but along a vertical column 116 between height positions is adjustable, those of the two turntables 32 and 34 and the lock chambers 64 correspond.
  • the column 116 is mounted on a carriage 118, which by means of a motor 120 adjustable radially to the central axis of rotation A and away from it is.
  • the motor 120 drives a nut that reciprocates movement of a hollow attached to the carriage 118 Spindle 122 generated. Another is for lifting movements Motor 124 is provided, which is flange-mounted on the motor 120 and drives a shaft 126.
  • the shaft 126 extends extends through the hollow spindle 122 and drives in turn a vertical spindle 128, which with the lamellar comb 114 is threaded to lift and close reduce.
  • At least one of the secondary chambers 110 can have a device 130 for cooling or quenching the previously heated workpieces W contain; this device 130 can, as in the right part of FIG Fig.4 indicated, be designed so that by the relevant Secondary chamber 110 a cooling gas, for example nitrogen, can be passed through.
  • a cooling gas for example nitrogen
  • an oil bath to quench in one of the subchambers 110 be provided.
  • first secondary chamber 110 which in the direction of arrow C in Figure 2 follows the panel 96, in addition to the opening 94 connecting it to lock rotor 60 also has an opening additional opening 132 formed in the outer wall 12, which connects this secondary chamber with the upper turntable 32.
  • An opening 134 opens into the last secondary chamber 110 connects them to the lower turntable 34. All openings 94, 132 and 134 in the outer wall 12 of the furnace housing 10 and the passages 88 of the sealing ring 80 are dimensioned so that one of the lamellar combs 102 or 114 between the fins 40 of the treatment rotor 30 or between the fins 70 of the lock rotor 60 can be inserted.
  • the rotary cycle furnace shown in Fig. 1 to 6 works as follows:
  • the lamella comb 102 of the charger 100 is pivoted out of the casing 96 according to FIG. 2, for example clockwise, and is loaded with a batch of workpieces W. This can be done by placing the workpieces W directly on the lamellar comb 102 or by placing them on a pallet or by placing them on a tray which is then taken over by the lamellar comb 102.
  • the lamellar comb 102 is pivoted together with the workpiece batch into its radial normal position and then, with the lock rotor 60 at a standstill, moved radially inward into the lock chamber 64 which is just radially aligned with the lamellar comb 102.
  • the lamella comb 102 assumes a height position which lies somewhat above the upper edges of the lamella 70. As soon as the lamella comb 102 has reached its radially inner position, it is lowered to such an extent that the batch of workpieces is placed on the lamellae 70, and thus on the lock place 74 of the lock chamber 64 in question.
  • the lamella comb 102 is then pulled back radially outwards, and the lock rotor 60 is moved one step, So in the example shown rotated by 60 °, for example counterclockwise, as indicated in Fig.2 with the arrow C. Meanwhile, the one with the first batch of workpieces moves occupied lock chamber 64 on the first suction port 66 over; this lock chamber 64 is thus evacuated State in the position in which it is with the first Secondary chamber 110 is aligned.
  • the transfer device 112 arranged there fetches the batch of workpieces radially from the lock chamber mentioned 64 out, moving it down to the plane of the upper turntable 32, pushes the workpiece batch in a radial Direction in this turntable and sets it at a minor further downward movement on one of its batch places 36 from. Then the treatment rotor 30 by one Step rotated by 5 °.
  • This sequence of operations is carried out with successive lock chambers 64 of the lock rotor 60 and with successive Batch places 36 of the upper turntable 32 repeated as long as until it is complete, in the example shown with a total seventy-two batches of workpieces.
  • the batch of workpieces under consideration is then replaced by the same, in the second auxiliary chamber 110 arranged conversion device 112 again dropped off at the same empty lock place 74, and the Lock rotor 60 is rotated by a further step.
  • the viewed workpiece batch thus reaches the radial area inside the third subchamber 110, from there arranged transfer device 112 taken over in the third secondary chamber 110 further cooled and then back to its previous one Returned to Schleusenplatz 74.
  • the workpiece batch in question in the fourth sub-chamber 110 further cooled and if necessary then brought back to her previous lock place 74.
  • the lock rotor 60 In the next step of the lock rotor 60, it now arrives adequately cooled batch of workpieces to the fifth secondary chamber 110.
  • the lock chamber 64 moves on the way there, which contains this batch of workpieces, on the second suction port 67 over and is thereby removed from the coolant contained in it, e.g. Nitrogen, or free from oil vapors.
  • the material batch considered is then by means of the in the fifth subchamber 110 arranged transfer device 112 from its lock chamber 64 brought out and on a batch space 38 of the lower turntable 34 discontinued. This sequence of processes is repeated as often as until the lower turntable 34 is also complete with workpiece batches is busy.
  • the rotary cycle oven according to Fig. 7 to 9 differs from in Fig. 1 to 6 embodiment shown in that Treatment rotor 30 and the lock rotor 60 radially outside are stored; their bearings 26 and 62 are on the outer wall 12 the furnace housing 10 is arranged.
  • the space radially inside the two rotors 30 and 60 is used to house the fairing 96 with the charger 100 and the five secondary chambers 110 each one of the transfer devices 112 used.
  • the charger 100 and the Conversion devices 112 are according to FIGS. 7 to 9 compared to FIG. 1 up to 6 arranged in reverse; the lamellar combs 102 and 114 are So with the free ends of their slats directed radially outwards.
  • the sealing ring 80 seals against a cylindrical one Inner wall 136 of the furnace housing 10, and in this are the Openings 94, 132 and 134 are arranged.
  • the lock chambers 64 are open radially inwards according to Fig. 7 to 9. Accordingly lock positions 74 and batch positions 36 and 38 radially from the inside to the outside with one workpiece batch each loaded and emptied in the reverse direction.
  • the cladding 96 forms a feed channel 138, which is above of the cover 18 of the furnace housing 10 extends radially outwards.
  • a rotating body 140 by means of a Motors 142 gradually by 180 ° around a vertical Rotation axis D rotatably arranged.
  • the rotating body 140 has two Lamella arrangements 144 diametrically opposite one another in which the lamella comb 102 of the charger 100 radially can be inserted.
  • the charger 100 works with the rotating body 140 for depositing and removing workpiece batches in the same Way together as with the lock rotor 60.
  • the mode of operation of the rotary cycle furnace shown in Fig. 7 to 9 is otherwise analogously the same as described with reference to FIGS. 1 to 6 has been.
  • FIG. 10 to 14 In the rotary cycle oven shown in Fig. 10 to 14, this has Furnace housing 10 in addition to the upper intermediate floor 16 lower shelf 17.
  • the upper turntable 32 of the treatment rotor 30 is between the two intermediate floors 16 and 17 arranged in an evacuable part of the furnace space
  • the lower turntable 34 is between the underbody 14 and the lower shelf 17 in a normally not evacuated but with atmospheric air or with an inert one Gas like nitrogen-filled part of the furnace chamber 20 is arranged.
  • the two turntables 32 and 34 are sealed against one another, thermally insulated from each other and heatable independently of each other.
  • Each of the two motors 50 drives two pinions 51 according to FIG. each with a ring gear on the top or bottom Turntable 32 or 34 is in constant engagement.
  • the two turntables 32 and 34 each be a double disc arrangement, which against the Oven housing 10 is sealed and each one delimited Forms part of the furnace chamber 20.
  • the lock rotor 60 also has the one shown in FIGS. 10 to 14 Embodiment six lock chambers 64, the arranged at angular intervals of 60 °, however, in contrast to the previous exemplary embodiments are open radially outwards and radially inwards. Rings around the lock rotor 60 is a stationary one on the furnace housing 10 radially outer sealing surface 76 in the form of an inner cone, which has its smallest diameter below. Concentric there is also a stationary one on the furnace housing 10 radially inner sealing surface 76 'in the form of an outer cone, which has its largest diameter below.
  • the lock rotor 60 also has a conical radially outer sealing surface 78, which has its largest diameter at the bottom, and a conical one radially inner sealing surface 78 ', the smallest diameter has down.
  • a corresponding is between the sealing surfaces 76 and 78 conical outer sealing ring 80 arranged in the Profile has the shape of a wedge tapering downwards.
  • Each of the sealing rings 80 and 80 ' is attached to the central axis A parallel key 160 or 160 ', which in a corresponding Recess 84 or 84 'of the cover 18 engages, prevented from rotating and is guided by means of pressure gas in the cover 18, e.g. Nitrogen, loaded piston 162 or 162 'axially biased downwards.
  • pressure gas e.g. Nitrogen, loaded piston 162 or 162 'axially biased downwards.
  • the outer seal ring 80 For loading and emptying and for evacuating the lock chambers 64 are four outer in the outer seal ring 80 radial passages 88 formed, which are at angular intervals of 60 ° offset from each other in the upper half according to Fig.10 of the outer sealing ring 80 are arranged and always when the lock rotor 60 is stationary, with one of the lock chambers 64 are cursed.
  • the inner sealing ring 80 ' has two inner radial passages diametrically opposite each other 88 ', which are aligned with one of the outer passages 88.
  • the sealing rings 80 and 80 ' have their in accordance Fig.10 lower area a larger number of closely consecutive Slots 146 and 146 'for introducing and discharging a Coolant into and out of the lock chambers 64.
  • the outer wall 12 of the furnace housing 10 has the level of the lock rotor 60 four outer ones offset by 60 ° each radial openings 94, each with one of the passages 88 of the outer sealing ring 80 are aligned.
  • the inner wall 136 of the furnace housing 10 has two inner radial at the level of the lock rotor 60 Openings 94 'arranged diametrically opposite one another and with one of the passages 88 'of the inner sealing ring 80 'aligned.
  • Around two of the outer openings 94 is on the outer wall 12 of the furnace housing 10 radially from the outside ago a panel 96 is attached, which is at the level of the lock rotor 60 through a slot 98 to the outside of the furnace housing 10 is open.
  • Inside the panels 96 one charger 100 each for inserting and removing workpiece batches arranged in or out of the lock chambers 64.
  • the other two, diametrically opposite, openings 94 in the outer wall 12 of the furnace housing 10 each open an outer secondary chamber 110, which is hermetically sealed to the outside and contains an external converter 112.
  • the Inner wall 136 of the furnace housing 10 encloses two inner secondary chambers 110 ', separated by a vertical partition 148 are separated and one of two diametrically opposite each other contained opposite conversion devices 112 '.
  • Each of the four conversion devices 112 and 112 ' has one Lamellar comb 114 or 114 'on which the lamellar combs 102 of the Chargers 100 corresponds, but in contrast to them constantly arranged radially, but along a vertical column 116 or 116 'is adjustable between height positions, the those of the upper and lower turntable 32 and 34 and the Lock chambers 64 correspond.
  • the columns 116 and 116 ' are attached to a carriage 118 or 118 ', which by means of a motor 120 or 120 'radially towards the central axis of rotation A. and adjustable from it.
  • Each of the motors 120 and 120 ' drives a mother making a reciprocating motion a hollow attached to the associated slide 118 or 118 ' Spindle 122 or 122 'generated. Another is for lifting movements Motor 124 and 124 'provided the coaxially to the Motor 120 or 120 'is flanged and a shaft 126 or 126 'drives. The shaft 126 and 126 'extends through the associated hollow spindle 122 or 122 'and drives in turn a vertical spindle 128 or 128 ', with the associated lamella comb 114 or 114 'in threaded engagement stands to raise and lower it.
  • outer secondary chamber arranged on the left according to FIGS. 10 and 11 110 opens out in addition to that connecting it to the lock rotor 60 upper outer opening 94 also in the outer wall 12 formed central outer opening 132 through which this outer secondary chamber 110 accessible from the upper turntable 32 is.
  • Aligned with this central outer opening 132 a central inner opening formed in the inner wall 136 132 'through which the upper turntable 32 from the inner sub-chamber 110 'is accessible from. 10 and 11 outer subchamber 110 arranged on the right opens into a lower one outer opening 134 through which the lower turntable 34 is accessible is.
  • the transfer device 112 in the left outer according to FIGS. 10 and 11 Sub-chamber 110 is equipped with a heating plate 150 which is arranged at a distance above the lamella comb 114 and heated the workpieces lying on it from above, e.g. electro-inductive or by heat radiation.
  • a rotary indexing oven is different from the first and second embodiment for quenching the workpieces W a device with coolant supply channels 152 and 152 'is provided, which extend along the outer wall 12 or inner wall 136 of the furnace housing 10 over a very wide angular range of extend about 160 ° in the circumferential direction so that they are continuous with two, sometimes even three, successive lock chambers 64 have connection and this with coolant, e.g. cold nitrogen, supply.
  • the coolant is through coolant discharge channels 154 and 154 'derived after having the flows through them in related lock chambers 64 Has.
  • each lock chamber 64 is according to FIG. 13 and 14 enclosed by an interchangeable sleeve 156 which extends radially to the central axis A, radially inside and is open on the outside, consists of perforated sheet metal and the associated slats 70 wears.
  • the environment of the sleeve 156 is in each case on the Coolant supply channels 152, 152 ', and the interior of the sleeve 156 connected to the coolant discharge channels 154, 154 'as long as the lock chamber 64 concerned the angular range described through these channels.
  • the lamella comb 102 of the left according to FIGS. 10 and 12 Charger 100 is pivoted out of the associated panel 96 and loaded with a batch of workpieces W; then the lamellar comb 102 is pivoted into its normal radial position and radially inward into that lock chamber 64 retracted, just aligned radially on this lamella comb 102 is. Then the batch of workpieces is in the lock place 74 of the lock chamber 64 in question and the said lamella comb 102 is retracted radially outward.
  • the lock rotor 60 is then moved one step, in example shown by 60 °, in the direction of arrow C in Fig. 10 rotated. This moves with the first batch of workpieces occupied lock chamber 64 past suction port 66, which is arranged on the outer wall 12 of the furnace housing 10 and on a suction pump is connected.
  • the said lock chamber 64 thus reaches the position in the evacuated state, in which they with the left outer secondary chamber according to Fig.10 and 11 110 and simultaneously with the left inner secondary chamber 110 'has connection.
  • the transfer device arranged in the latter 112 'fetches the workpiece batch radially out of the lock chamber mentioned 64 out, moving it down to the plane of the upper turntable 32, pushes the workpiece batch radially outside in this turntable and sets it at a minor further downward movement on one of its batch places 36 from. Then the treatment rotor 30 by one Step rotated by 5 °.
  • This sequence of operations is carried out with successive lock chambers 64 of the lock rotor 60 and with successive Batch places 36 of the upper turntable 32 repeated as long as until it is complete, in the example shown with a total seventy-two batches of workpieces.
  • the transfer device 112 is arranged on the left in accordance with FIGS. 10 and 11 outer subchamber 110 used to hold this batch of workpiece from their batch location 36 on the upper turntable 32 to lift them off by means of the heating plate 150 to hardening temperature and hold them in the lock chamber 64 above to drop off at Schleusenplatz 74.
  • This lock chamber 64 has become free by the fact that the one working at the same time Transfer device 112 'in the left inner secondary chamber 110' untreated workpiece batch from this lock chamber to has just brought vacant batch number 36.
  • the heated workpiece batch arrives at the next step of the Lock rotor 60 in the effective range of the coolant supply channels 152, 152 ', so that the workpieces W of this batch be put off, taking because of the long while almost three steps of the lock rotor 60 the coolant to a relatively low temperature, e.g. can be cooled to 5 ° C.
  • the lock rotor 60 In the fourth step of the lock rotor 60, it now arrives sufficiently cooled workpiece batch in a position between 10 and 11 the right outer secondary chamber 110th and the right inner subchamber 110 '. There is the considered Batch of material from in the right inner side chamber 110 'arranged inner conversion device 112' from their Lock chamber 64 removed and in a batch space 38 of the lower turntable 34. This sequence of operations will repeated until the lower turntable 34 is also complete, in the example shown with seventy-two workpiece batches, is busy.
  • This lock chamber 64 with its lock place 74 is thereby released that the simultaneously operating transfer device 112 'in the right inner secondary chamber 110' a quenched Workpiece batch from this lock place to the one just released Lot 38 has brought.
  • the rotary cycle oven according to the invention almost enables one continuous, fully automatic and in the production line fully integrable and linkable heat treatment process as well a product-related increase in quality and quantity.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Organic Chemistry (AREA)
  • Tunnel Furnaces (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Specific Conveyance Elements (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Furnace Charging Or Discharging (AREA)
EP97934473A 1996-08-30 1997-07-16 Rundtaktofen zum behandeln von werkstücken Expired - Lifetime EP0922120B1 (de)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
DE19635257 1996-08-30
DE1996135257 DE19635257C1 (de) 1996-08-30 1996-08-30 Rundtaktofen zum Behandeln von Werkstücken
DE19638106 1996-09-18
DE1996138106 DE19638106C1 (de) 1996-08-30 1996-09-18 Rundtaktofen zum Behandeln von Werkstücken
DE1996139933 DE19639933C1 (de) 1996-08-30 1996-09-27 Rundtaktofen zum Behandeln von Werkstücken
DE19639933 1996-09-27
PCT/EP1997/003805 WO1998008988A1 (de) 1996-08-30 1997-07-16 Rundtaktofen zum behandeln von werkstücken

Publications (2)

Publication Number Publication Date
EP0922120A1 EP0922120A1 (de) 1999-06-16
EP0922120B1 true EP0922120B1 (de) 2001-10-24

Family

ID=27216595

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97934473A Expired - Lifetime EP0922120B1 (de) 1996-08-30 1997-07-16 Rundtaktofen zum behandeln von werkstücken

Country Status (7)

Country Link
US (1) US5997290A (es)
EP (1) EP0922120B1 (es)
JP (1) JP2000517045A (es)
AT (1) ATE207546T1 (es)
DE (1) DE59705105D1 (es)
ES (1) ES2163791T3 (es)
WO (1) WO1998008988A1 (es)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6209225B1 (en) * 1998-10-23 2001-04-03 Danilo Villarroel Rotatoty dryer for copper concentrate
DE102004015325A1 (de) * 2004-03-30 2005-10-13 Dürr Ecoclean GmbH Behandlungsvorrichtung zur Behandlung von Werkstücken oder Werkstückgruppen
JP6403959B2 (ja) * 2014-03-06 2018-10-10 Ｄｏｗａサーモテック株式会社 浸炭焼入れ設備
JP6948746B2 (ja) * 2019-08-27 2021-10-13 関東冶金工業株式会社 熱処理炉
CN113736960B (zh) * 2021-09-01 2022-11-15 江西樟树市福铃内燃机配件有限公司 一种铸件的热处理设备

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4412813A (en) * 1982-02-02 1983-11-01 Alco Standard Corporation Rotary hearth furnace and method of loading and unloading the furnace
FR2617953B2 (fr) * 1982-04-27 1989-11-03 Innovatique Sa Four a sole tournante pour le traitement thermique, thermochimique ou electrothermique de metaux sous atmosphere rarefiee ou controlee
JPS58217625A (ja) * 1982-06-09 1983-12-17 Daido Steel Co Ltd 熱処理装置
DE3435376C2 (de) * 1984-09-27 1996-09-12 Loi Ipsen Holding Gmbh Verfahren zur Wärmebehandlung von Werkstücken
SE450389B (sv) * 1984-10-02 1987-06-22 Volvo Ab Metod och anleggning for vermebehandling av detaljer med varierande krav pa vermebehandlingstid
JPS6191485A (ja) * 1984-10-11 1986-05-09 フア−ネス重工株式会社 炉
US4666358A (en) * 1985-01-31 1987-05-19 Felix Wojciechowski Apparatus for handling parts
JP2819292B2 (ja) * 1988-05-31 1998-10-30 ファーネス重工株式会社 炉
DE4005956C1 (es) * 1990-02-26 1991-06-06 Siegfried Dipl.-Ing. Dr. 5135 Selfkant De Straemke
US5404894A (en) * 1992-05-20 1995-04-11 Tokyo Electron Kabushiki Kaisha Conveyor apparatus
DE4442152A1 (de) * 1994-11-26 1996-05-30 Richard Dipl Phys Dr Buchmann Transportvorrichtung für kleine zylindrische Körper mit der Möglichkeit zur verfahrenstechnischen Behandlung der Körper während des Transports
DE29505496U1 (de) * 1995-03-31 1995-06-01 Ipsen Industries International GmbH, 47533 Kleve Vorrichtung zur Wärmebehandlung metallischer Werkstücke unter Vakuum

Also Published As

Publication number Publication date
EP0922120A1 (de) 1999-06-16
US5997290A (en) 1999-12-07
DE59705105D1 (de) 2001-11-29
ATE207546T1 (de) 2001-11-15
WO1998008988A1 (de) 1998-03-05
JP2000517045A (ja) 2000-12-19
ES2163791T3 (es) 2002-02-01

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