EP0806485A1 - Wärmebehandlungsanlage - Google Patents

Wärmebehandlungsanlage Download PDF

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Publication number
EP0806485A1
EP0806485A1 EP96107095A EP96107095A EP0806485A1 EP 0806485 A1 EP0806485 A1 EP 0806485A1 EP 96107095 A EP96107095 A EP 96107095A EP 96107095 A EP96107095 A EP 96107095A EP 0806485 A1 EP0806485 A1 EP 0806485A1
Authority
EP
European Patent Office
Prior art keywords
oven
opening
plug
ovens
installation according
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.)
Withdrawn
Application number
EP96107095A
Other languages
English (en)
French (fr)
Inventor
Thierry Spérisen
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.)
Patherm SA
Original Assignee
Patherm SA
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 Patherm SA filed Critical Patherm SA
Priority to EP96107095A priority Critical patent/EP0806485A1/de
Publication of EP0806485A1 publication Critical patent/EP0806485A1/de
Withdrawn legal-status Critical Current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
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C21D9/0018—Details, accessories not peculiar to any of the following furnaces for charging, discharging or manipulation of charge
    • 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
    • C21D1/62—Quenching devices
    • C21D1/63—Quenching devices for bath quenching
    • 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 generally relates to thermal treatment installations.
  • the invention relates to an installation for heat treatment of loads to be treated such as metal parts, comprising at least one oven having an opening downwards, the oven comprising a plug which can be locked on the oven to close the opening. of the oven during the processing of the loads and which can be unlocked and released from the opening of the oven during the operation of loading and unloading of the loads in the oven, and means for loading and unloading the oven.
  • a heat treatment installation as defined above and comprising at least one oven open at the bottom, generally designated bell furnace, and provided with a closure plug is already known for example from document EP-A-0 296 102 .
  • the plug is articulated on a rear wall of the furnace and pivots about an axis parallel to said rear wall to open or close the furnace, the pivoting of the plug being ensured by a jack.
  • the oven is opened, for example to transfer a charge at high temperature to an appropriate treatment medium, the plug is released from the oven opening by pivoting downwards until it reaches a substantially vertical.
  • the opening of the oven is generally carried out while it is at its processing temperature (generally of the order of 850 ° C. or more), the plug is also at a temperature close to that of the oven and radiates very violently by exposing operators in the vicinity to the risk of serious burns. It is therefore understandable that, given the increasing requirements in terms of personnel security, such installations will soon no longer be possible.
  • the type of installation described above has the drawback of having to use one or more fans for extracting the vapors of quenching and other vapors produced during the operation of the installation.
  • legislation on environmental releases is tending to become more and more restrictive and will soon no longer be sufficient to simply dilute harmful emissions before discharging them into the atmosphere, the pollution measurements then being made taking account for the dilution of the fumes in the suction air.
  • the main purpose of the invention is to remedy the drawbacks of the above-mentioned prior art by providing a thermal treatment installation equipped with a handling device and an oven plug offering all the guarantees of safety for the personnel during the release of the plug from the oven opening.
  • Another object of this invention is to allow easy manipulation of the oven plug.
  • Another object of the invention is to provide an installation which is of a simple and economical design.
  • Yet another object of this invention is to provide an installation which allows efficient treatment of fumes produced during its use, before their release into the atmosphere.
  • the subject of the invention is an installation for heat treatment of loads to be treated such as metal parts, comprising at least one oven having an opening downwards, the oven comprising a plug which can be locked on the oven to close the opening of the oven during the treatment of the loads and which can be unlocked and released from the opening of the oven during operations of loading and unloading of the loads in the oven, and means for loading and unloading of the oven, characterized in what it further comprises a handling device capable of being placed under the oven by a relative movement of the oven relative to said handling device or vice versa so that it can come opposite the opening of the oven, said handling device comprising handling means, or vice versa for engaging said plug in the opening of the oven and removing it, and means for receiving the bo uchon which confine at least laterally the radiation emitted by the cap.
  • the part of the plug located in the oven and therefore having a high temperature, penetrates into the receiving means as soon as the oven is opened, so that the thermal radiation emitted by the plug during the opening is hidden from people working near the oven. This eliminates any direct influence of the radiation from the plug on the operators of the installation, which could endanger these people.
  • the handling means are vertically movable between a first position, in which they support the plug to allow it to be locked and unlocked, and a second position in which they place the plug in said receiving means.
  • the movements of engagement of the plug in the opening of the furnace and of disengagement thereof are simple.
  • the installation according to the invention also makes it possible to remove any plug and actuation structure of the latter which is integral with the oven, such as that of document EP-A-0 296 102, which makes the installation of the simpler and more economical invention.
  • the subject of the invention is an installation for heat treatment of charges, comprising at least two ovens each having a downward opening, the ovens each comprising a plug which can be locked on the oven to close the opening of the oven during the processing of the loads and which can be unlocked and released from the opening of the oven during the loading and unloading operation of the loads in the oven, and the means for loading and unloading the ovens, characterized in that said installation further comprises an airlock common to said ovens, said airlock being in communication on the one hand with the ovens by their opening and on the other hand with the outside by an access hatch associated with each opening of the ovens and arranged in view of the opening of the oven with which it is associated, each access hatch being provided with a closing flap, and a device for handling the plugs comprising means for manipulating tion to engage said plugs in the openings of the ovens and release them while maintaining them inside the airlock.
  • Such a heat treatment installation allows, in addition to safe handling of the plug when it is at high temperature by handling it inside the airlock, a concentration and easy collection of the gas fumes present in the ovens.
  • the installation further comprises at least one cooling tank open upwards, the ovens and the tank being able to be brought into superimposed position by a relative movement of one by compared to each other so that the opening of the ovens can come opposite the access hatches of the airlock and establish a sealed communication between the cooling tank on the one hand and the ovens and the airlock on the other hand, and means of loading and unloading bin and ovens.
  • the vapors produced during quenching in the cooling tank do not escape into the surrounding atmosphere but are concentrated in the airlock without the need to use air extractors above the installation, which dilute the fumes.
  • the fumes, in particular those produced during quenching can be simply evacuated by the overpressure present in the airlock.
  • the installation 1 comprises a bell furnace 2, that is to say an oven open downwards inside which can be introduced, via an opening 4 and by a vertical displacement, a load 6 formed by a part or a set of parts to be treated arranged on a support plate 8 produced for example under the shape of a rigid flat honeycomb grid.
  • the oven 1 comprises a sealed enclosure 10, the opening 4 being closed by a plug 12, the detailed structure of which will be described below.
  • heating means 14 such as gas burners, making it possible to raise the temperature inside the enclosure to a desired value.
  • any other heating means can be provided, such as for example electrical resistance ramps.
  • the oven 1 also includes, in its upper part, means for stirring 16 of the atmosphere present in the enclosure.
  • These means 16 conventionally comprise a motor 18, placed outside the oven on its upper wall 20, the shaft 22 of which enables a fan located inside the enclosure 10 to be actuated.
  • retaining studs 24 In the lower part of the enclosure 10 are provided retaining studs 24 (only two of which are visible in FIG. 1) which project from the inner wall 26 of the enclosure 10. These retaining studs 24 are intended to support the support plate 8 provided with the load 6 between the processing operations when the oven 1 is open (FIG. 2). In fact, when the oven is closed by the plug 12, the support plate is raised above the retaining studs 24 by support feet 28 integral with the plug 12 (FIG. 1) in order to avoid the creep of the studs 24 under load 6.
  • the plug 12 comprises a plate 30 closing the opening 4.
  • the plate 30 comprises, in the region of its edge, a peripheral groove 32 receiving a seal 34.
  • This seal 34 which can be made of polymer, refractory cord, sand or the like, is applied to a seal surface 36, preferably cooled, provided on the lower edge of the enclosure 8.
  • the surface 36 comprises for example a duct or a sealed box in which circulates a cooling fluid.
  • the plug 12 also comprises a layer of material 38 forming thermal insulation on the face of the plate 30 directed towards the interior of the enclosure 10.
  • the insulating layer 38 is traversed by the support feet 28 integral with the plate shutter 30.
  • the plug 12 comprises locking means 39 by which it is kept closed on the furnace.
  • the locking means 39 are secured to the plug 12 and are controlled by an external actuator 40 secured to a base 42 for supporting the plug, forming part of a device for handling the plug 44 which will be described in more detail below.
  • the locking means 39 comprise one or more locking members 46 intended to be hooked onto complementary means 48 provided on the inner wall 50 of the base 52 of the oven.
  • the locking member 46 is made in the form of a cross with four branches ( Figure 5), mounted in rotation, for example by means of a ball bearing 54 (shown symbolically in Figures 1, 2, 4 and 5) on the face of the plate 30, directed towards the outside of the enclosure 10.
  • the external actuator 40 is shaped to be temporarily connected to one of the branches 46 to rotate the cross around a central axis perpendicular to its plane.
  • the actuator 40 consists of a hydraulic control member, such as a jack, but it and of course it could provide the same function by being made of a member of similar type without output from the part of the invention.
  • the actuator 40 is controlled by a conventional power supply (not shown) and is fixed to the support base 42 by a fixed end while it comprises at its other end a movable finger 56 projecting vertically towards the furnace.
  • the finger 56 can engage in an opening 58 provided for this purpose in one of the branches of the cross 46.
  • the finger 56 can angularly move the cross around its axis of rotation by a first angular position (shown in broken lines in FIG. 5) in which the plug can be introduced vertically into the opening 4 of the furnace by lifting means, which will be described below, so that the end of the branches 46 comes substantially above the level of the complementary retaining means 48, towards a second angular position (shown in strong lines) in Figure 5) in which the ends of the branches can be superimposed on the complementary retaining means 48 and rest by simple support thereon (Figure 4).
  • the thermal treatment installation comprises the device for handling the plug 44 which is also shown in top view in FIG. 3.
  • This handling device 44 is capable of being placed under the oven 2 so that the device can come next to the opening 4 of the oven to engage the plug 12 in this opening or release it.
  • the device 44 comprises handling means 60 and means 62 for receiving the plug 12 confining at least laterally the radiation emitted by the latter when it is released from the opening of the oven at high temperature.
  • the device 44 comprises a support frame or carriage 64 mounted on rollers 66 and on which is mounted, raised by support legs 68, for example three in number a receptacle 70 open upwards.
  • This receptacle made, for example of sheet steel, forms the receiving means 62.
  • the bottom 72 of the receptacle 70 is crossed by lifting means 74, such as a hydraulic cylinder, having a fixed end fixed to the support frame 64 and its other movable end connected to the support base 42 intended to carry the plug 12.
  • lifting means 74 provided with the support base 42 form the handling means 60.
  • the actuator is fixed on the upper face 76 of the support base 42 and that three support studs 78 protrude from this face 76.
  • These studs 78 regularly distributed around the periphery of face 76, are intended to receive and support the plug 12 via the plate 30 while allowing actuation of the locking means 46.
  • the support base 42 is therefore movable vertically and can be moved between a first position in which it comes to be placed under the plate 30 to raise the plug from a height such that the locking member no longer rests on the complementary means. retainer 48, (FIG. 1), and a second position in which it brings the plug 12 into the receptacle 70 while disengaging it completely from the opening 4 (FIG. 2), the actuator 40 integral with the support base 42 having previously acts on the locking member 46 so that the latter is released relative to the complementary retaining means 48.
  • the receptacle 70 has dimensions such that when the device 44 is placed under the oven, it comes as far as possible flush with the lower surface 80 of the oven. Furthermore, the receptacle 70 and the stroke of the lifting means 74 are provided so that the side walls of the receptacle form a screen for confining the radiation emitted by the plug 12 whatever the position of the support base 42 in the receptacle 70 when the plug 12 is supported by the support base 42.
  • the installation comprises conventional means for loading and unloading the oven, which can be produced by a robot manipulator 90, shown diagrammatically in FIG. 1, which moves for example on a track parallel to that on which the plug handling device 44.
  • This robot 90 comprises a lower platform 92 resting on the ground by means of rollers 94.
  • This platform 92 carries a guide column 94 provided with a base 96 which can be moved along this column by lifting means (not shown) such as a hydraulic cylinder.
  • a plate 98 is also movably mounted on the base 96, for example on rails of these, this plate 98 can be moved in a plane parallel to the plane of the platform 92, by means of an actuator (not shown) to be placed below the oven 4, opposite the opening 4 of the latter.
  • the base 96 is mounted on the column so that it can rotate at least 180 ° C around it.
  • FIG 6 there is shown an alternative embodiment of the locking means of the plug 12 on the opening 4 of the oven.
  • the locking is effected by means of several locking jacks 100, (for example three in number) distributed regularly at the periphery of the opening 4 of the furnace and fixed directly to the bottom wall of the oven.
  • the jacks 100 can be controlled so that their rod 102 projection opposite the opening and that the plug 12 can come to rest on the rods 102, for example by means of the plate 30.
  • the upper face of the latter comprises, in this embodiment, centering studs 104 which cooperate with corresponding recesses 106 formed in the plate 30.
  • FIG. 7 to 9 there is shown a heat treatment installation designated by general reference 110 according to another aspect of the invention and in which the elements identical to those described in connection with Figures 1 to 6 are designated by the same reference numerals.
  • the airlock 112 is in communication on the one hand with the interior of the ovens 2 by their opening 4 and on the other hand with the exterior by an access hatch 124 associated with each opening 4 of the ovens 2 and arranged opposite the opening of the oven with which it is associated.
  • Each hatch 124 is provided with a closing flap 126 which closes the airlock 112 in a sealed manner.
  • the flap 126 generally moves in a plane parallel to the access hatch, by means of rollers 128, along parallel rails 130 located on either side of the access hatch. 124 and is actuated by a jack 132. It will be noted in this connection that such a closure system has the advantage of having a small overall height.
  • the movement mechanism of the flap 126 further comprises means 134 for applying the flap 126 against a seal 136, formed on a surface 138 extending at the periphery of the access hatch 124 inside the airlock 112, when the flap 126 is in the closed position.
  • Such means 134 are well known to those skilled in the art and can for example comprise a toggle system each formed from two rods 140, 142 articulated respectively on the flap and on the rollers 128, the flap 126 being applied against the joint 136 when it reaches a stop 144 which allows the knee pads to deploy and lock, as shown diagrammatically in FIG. 7.
  • a toggle system each formed from two rods 140, 142 articulated respectively on the flap and on the rollers 128, the flap 126 being applied against the joint 136 when it reaches a stop 144 which allows the knee pads to deploy and lock, as shown diagrammatically in FIG. 7.
  • any other suitable system such as cam, wedge or similar systems can be considered.
  • the plug handling device 114 comprises handling means which are described below and allow the plugs 12 to be engaged in the respective openings 4 of the ovens 1. These handling means also allow the release of plugs from openings 4 of the ovens to release the openings of the ovens and to be able to load and unload them respectively while maintaining the plugs 12 inside the airlock 112 and thus protecting the operators working around the installation from the radiation of the plugs which are located at high temperature when removed from the ovens.
  • the access hatches 124 will in principle be closed outside of the load transfer operations to the ovens or coming from the ovens to the outside.
  • the handling means comprise, for each oven, a movable handling arm 146 which extends substantially parallel to the plane of the opening of the oven with which it is associated.
  • This arm 146 is connected by one end to the end of an actuator 148 secured to an upper wall 150 of the airlock 112 and which comprises at its opposite end a support base 152 comprising a plate capable of supporting the plug 12.
  • the manipulation arm 146 is in the form of a beam having for example an I-section, having a high rigidity taking into account its cantilever fixing and the weight of the plug which 'it supports at its free end.
  • the actuator 148 is produced in the form of a hydraulic cylinder whose cylinder 154 extends outside the airlock 112 and whose rod 156 extends through the upper wall 150 inside the airlock, the cylinder extending substantially perpendicular to the longitudinal axis of the arm 146.
  • the cylinder 148 can be controlled in rotation about its longitudinal axis L and in translation along its longitudinal axis respectively according to the arrows R and T in the drawing. Consequently, the plug handling device is partially arranged in the airlock. It goes without saying that, according to a variant, the handling device could be entirely housed inside the airlock.
  • the latter can, during a first phase, be moved vertically by the appropriate control of the actuator 148, in an intermediate position II (FIG. 7) in which it supports the plug 12 while completely disengaging it from the opening 4.
  • the plug 12 is then below and the opening of the oven and above the access door 124 to this oven.
  • the manipulation arm 146 is actuated in rotation by the jack 148 so that it moves angularly to come into a second position III (FIG. 7 and POS III FIG. 8).
  • the structure of the handling means ensures the maintenance and locking of the plug in the opening of the oven and thus makes it possible to dispense with the use of locking means for the plug 12 such as those described in conjunction with Figures 1 to 6.
  • the cooling tank 116 is open upwards and mounted on rollers 160 so that it can be brought into a superposed position under the access hatches 124 and therefore under the ovens, so that the opening 122 of the tank can come exactly opposite these.
  • the container can be fixed and the assembly comprising the ovens and the airlock can be mobile, or the container and this assembly can both be mobile.
  • the installation comprises means 120 which make it possible to establish sealed communication between the cooling tank 116 on the one hand and the ovens 2 and the airlock 112 on the other hand, once the tray 116 has been brought into a position in which its opening 122 is opposite an access hatch 124 to the airlock (FIG. 7).
  • these means 120 essentially comprise a lifting device 164 secured to the tank 116 and formed in its lower part and sealing means 166 arranged at the periphery of the opening 122 of the tank.
  • the lifting device 164 allows vertical movement (according to arrow F in the drawing) of the tank 116 and is formed for example of a conventional hydraulic scissor mechanism (shown diagrammatically in FIG. 7), integral with the bottom of the tank and s extending between this bottom 168 and the ground on which the tank circulates.
  • the lifting device 164 not integral with the tank 116, but for example a plurality of lifting devices installed in pits provided for this purpose in the ground in line with the ovens.
  • the sealing means 166 comprise for example a seal of the "O-ring" type 170 disposed in an annular housing 172 and intended to cooperate with an associated bearing 174 formed on the airlock opposite the housing, the bearing 174 extending around from the access hatch.
  • the scissor mechanism when the lifting device 164 is actuated, the scissor mechanism is deployed, during a first phase, to come into contact with the ground and bear on it, by means of pads provided in the part bottom of the mechanism, then continues its deployment during a second phase, to raise the tank 116 until applying the seal 170 against the bearing surface 174 and establishing sealed communication of the tank 116 with the airlock 112.
  • the lifting device 120 can be replaced by bellows means, either integral with a lower wall of the airlock and extending outside of it around the access hatch, either secured to an upper wall of the container and extending outside of it around the opening of the container.
  • the airlock 112 further comprises means 180 for evacuating gas fumes produced during use, by overpressure inside the airlock towards a processing unit 182 (FIG. 9).
  • the means of evacuation by overpressure can be formed by a non-return valve, by a pressure switch or the like, while the treatment unit can be formed by a burner associated with a filter, by a washing column. or the like.

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  • 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)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP96107095A 1996-05-06 1996-05-06 Wärmebehandlungsanlage Withdrawn EP0806485A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96107095A EP0806485A1 (de) 1996-05-06 1996-05-06 Wärmebehandlungsanlage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96107095A EP0806485A1 (de) 1996-05-06 1996-05-06 Wärmebehandlungsanlage

Publications (1)

Publication Number Publication Date
EP0806485A1 true EP0806485A1 (de) 1997-11-12

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EP96107095A Withdrawn EP0806485A1 (de) 1996-05-06 1996-05-06 Wärmebehandlungsanlage

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0995805A1 (de) * 1998-10-23 2000-04-26 Pierre Beuret Wärmebehandlungsanlage für eine Charge metallischer Werkstücke
EP1018562A1 (de) * 1999-01-08 2000-07-12 Patherm SA Vorrichtung und Verfahren zum selbsttätigen Öffnen und Schliessen des Deckels eines Abschreckbehälters
FR2845695A1 (fr) * 2002-10-11 2004-04-16 Patherm Sa Procede et installation de traitement thermique de pieces metalliques

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0023546A1 (de) * 1979-06-15 1981-02-11 Dr. Werner Herdieckerhoff, Nachfolger Industrieöfen - Apparatebau Verfahren und Vorrichtung zur Gefüge- und/oder Oberflächenveredelung von Metallen
EP0070347A1 (de) * 1981-07-17 1983-01-26 Michel Spérisen, Equipements industriels Wärmebehandlungsvorrichtung
US4647017A (en) * 1984-12-19 1987-03-03 Stainbrook Norbert E Vacuum heat treating furnace and quench system with drop transfer
EP0296102A1 (de) * 1987-06-03 1988-12-21 Pierre Beuret Vorrichtung mit mehreren Einzelteilen für Wärmebehandlungen
EP0533615A1 (de) * 1991-09-19 1993-03-24 Codere Sa Wärmebehandlungsanlage für aufeinanderfolgende Chargen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0023546A1 (de) * 1979-06-15 1981-02-11 Dr. Werner Herdieckerhoff, Nachfolger Industrieöfen - Apparatebau Verfahren und Vorrichtung zur Gefüge- und/oder Oberflächenveredelung von Metallen
EP0070347A1 (de) * 1981-07-17 1983-01-26 Michel Spérisen, Equipements industriels Wärmebehandlungsvorrichtung
US4647017A (en) * 1984-12-19 1987-03-03 Stainbrook Norbert E Vacuum heat treating furnace and quench system with drop transfer
EP0296102A1 (de) * 1987-06-03 1988-12-21 Pierre Beuret Vorrichtung mit mehreren Einzelteilen für Wärmebehandlungen
EP0533615A1 (de) * 1991-09-19 1993-03-24 Codere Sa Wärmebehandlungsanlage für aufeinanderfolgende Chargen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0995805A1 (de) * 1998-10-23 2000-04-26 Pierre Beuret Wärmebehandlungsanlage für eine Charge metallischer Werkstücke
EP1018562A1 (de) * 1999-01-08 2000-07-12 Patherm SA Vorrichtung und Verfahren zum selbsttätigen Öffnen und Schliessen des Deckels eines Abschreckbehälters
FR2845695A1 (fr) * 2002-10-11 2004-04-16 Patherm Sa Procede et installation de traitement thermique de pieces metalliques
WO2004033731A1 (fr) * 2002-10-11 2004-04-22 Patherm Sa Procede de traitement thermique de pieces metalliques

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