EP1207211A2 - Vorrichtung zur Wärmebehandlung von metallischen Werkstücken - Google Patents

Vorrichtung zur Wärmebehandlung von metallischen Werkstücken Download PDF

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Publication number
EP1207211A2
EP1207211A2 EP01811070A EP01811070A EP1207211A2 EP 1207211 A2 EP1207211 A2 EP 1207211A2 EP 01811070 A EP01811070 A EP 01811070A EP 01811070 A EP01811070 A EP 01811070A EP 1207211 A2 EP1207211 A2 EP 1207211A2
Authority
EP
European Patent Office
Prior art keywords
channel
fluidization
gas
recovery
basket
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Withdrawn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
EP01811070A
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English (en)
French (fr)
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EP1207211A3 (de
Inventor
Roland Aubry
Marc-Aurèle Steulet
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.)
Four Electrique Delemont Sa
Original Assignee
Four Electrique Delemont Sa
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Filing date
Publication date
Application filed by Four Electrique Delemont Sa filed Critical Four Electrique Delemont Sa
Publication of EP1207211A2 publication Critical patent/EP1207211A2/de
Publication of EP1207211A3 publication Critical patent/EP1207211A3/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Withdrawn legal-status Critical Current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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/22—Martempering
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/53—Heating in fluidised beds
    • 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
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

Definitions

  • the present invention relates to a processing device of metal parts according to the preamble to the independent claim 1.
  • Fluidized baths have been used for decades as a medium for heat exchange or temperature maintenance. Their main advantages are as follows: no post-washing necessary (oil, polymers, salt), no problem of effluents to be treated (oil, polymers, salt), no gradual degradation of performance (polymers), implementation easy, no solidification at low temperature (salt), no corrosion of the material (salt, polymers) and no danger of intoxication, fire or explosion.
  • the cooling power of the fluidized bath is however limited, because no latent heat of vaporization can be used, unlike the liquids mentioned.
  • Some tips allow improvements, such as spraying the bath with water, the use of fluidizing gases with high thermal characteristics (H 2 , He), cooling the bath with a cryogenic fluid (N 2 ), etc. .
  • a device for heat treatment of parts of metal including a continuous oven for heating metal parts and a fluidized bath of particles solids for soaking heated metal parts is described in European patent application EP-A-0 514 325.
  • the oven includes a laboratory which is crossed by the metal parts to be treated on a conveyor belt. After passing through the laboratory, the metal parts fall by gravity into a fall channel, from where they are transferred by a cell wheel to a quenching chamber in which is arranged the fluidized bath. The cell wheel closes the quenching chamber towards the fall channel. Extraction of metal parts from the quenching chamber is made by a transport device comprising two barrels each with a propeller for transport metal parts inside. Although the barrels have perforated coats, the fluidized bath of solid particles is destabilized by the two barrels.
  • the present invention aims to provide a device heat treatment of metal parts allowing soaking hot metal parts in a bath stable fluidized.
  • the extraction of the parts hardened metal of the fluidized bath should be done without interrupting the fluidization of the solid particles of the bath.
  • the essence of the invention consists of the following:
  • the device heat treatment of metal parts includes a continuous oven for heating metal parts and a fluidized bath of solid particles to quench the heated metal parts.
  • the continuous oven includes a laboratory intended to be crossed by metal parts to be treated and a drop channel into which the metal parts after passing through the laboratory.
  • the fluidized bath is placed directly in the fall.
  • a fluidization device for injecting fluidizing gas in the fall channel is arranged under the fall channel.
  • the bath of solid particles in the fall channel is traversed from bottom to top by the fluidization gas, the minimum operational fluidization flow of which depends on the section of the bath to be fluidized and on the type of solid particles.
  • the fluidizing gas enters the laboratory of the continuous furnace and is consumed by the furnace, that is to say that a gas is chosen which is compatible with the heat treatment atmosphere of the furnace.
  • the fluidizing gas therefore has a double function, which is a particular advantage of the device according to the invention.
  • the fluidizing gas is a gas of high thermal conductivity, for example N 2 , a mixture of N 2 and H 2 or an endothermic gas.
  • the gas flow fluidization is of the same order of magnitude as the flow of gas carrying the furnace, which can therefore replace it completely.
  • means of recycling gas from fluidization in the furnace drop channel must be planned, the flow of which will then be added to the gas flow fresh injected for fluidization.
  • These recycling methods preferably include a recycling channel whose inlet is connected to the drop channel above the level upper part of the fluidized bath and the outlet is connected to the fluidization device.
  • a suction pump is arranged in the recycling channel to suck gas from fluidization of the drop channel and pumping it into the device fluidization.
  • the flow of recycled gas is modular, for example by a valve for adjusting the gas.
  • the flow rate and composition of the fluidizing gas can be optimized based on cooling performance to reach on metal parts as well only cost imperatives. It is obviously also possible to inject additional gas, for example a shielding gas, directly in the continuous oven, gas which then adds to the fluidizing gas.
  • additional gas for example a shielding gas
  • the metal parts to be hardened are for example parts as standard, loaded loose on the mat in the oven continuous, cut, folded, or turned parts, necklines, stretched or cold formed or hot formed. They are most often made of steel, the type of steel chosen to be quenchable in a fluidized bath, in order to obtain the quenching structure desired for the dimensions of the parts.
  • Steelmaker catalogs and atlases of TRC curves (transformation into continuous cooling) and TTT (transformation time temperature) provide information on the feasibility of this quenching mode.
  • steels of the Cr type, Cr-Mo, Cr-Ni-Mo or Cr-V will suit the dimensions well cited.
  • the bath of solid particles chosen for the fluidization is composed, for example, of metal oxides of fine particle size, up to a maximum of 1000 microns, for example of Al 2 O 3 , ZrO 2 , SiO 2 , mullite or others.
  • the type of material chosen defines the heat transfer characteristics of the quenched parts, as well as the parameters of gas fluidization. It is necessary to know the apparent density, the density in fluidization, the thermal capacity and the thermal conductivity of solid particles. They must be chemically inert at the operating gas and temperature conditions.
  • the operating temperature of the fluidized bath is adapted in quenching mode: temperature close to temperature ambient for martensitic quenching, isothermal temperature higher than the Ms (martensite start) temperature of early martensite formation for quenching type bainitic.
  • This isothermal temperature can range from 160 ° C at 350 ° C depending on the type of steel and the final hardness requested for bainite. You should know that this particle bath homogenized in temperature by fluidization represents a large thermal inertia when the fluidization stops. Isothermal maintenance for the duration of transformation bainitique, for example from 10 to 60 minutes, can be also do in an isothermal holding zone outside the quench bath in the fall channel.
  • the heat treatment device preferably includes a parts recovery basket removable metal which is placed at the bottom of the channel fall.
  • the recovery basket has a bottom with a multiplicity of orifices allowing the fluidizing gas to pass, but not the solid particles of fluidization. Thanks to these orifices, fluidizing gas can be injected in the fluidized bath of solid particles by the fluidization device through the recovery basket. The fluidized bath is kept stable despite the basket recovery. Metal parts dipped in fluidized bath fall into the recovery basket at bottom of the drop channel and can be extracted from the channel fall by transfer of the recovery basket out of the drop channel.
  • a transfer channel is connected to the channel drop, the transfer channel comprising a part through which the recovery basket is brought to the bottom of the chute and an extraction part through which the recovery basket is removed from bottom of the fall channel.
  • the start of the game inlet and the end of the extraction part are closed each by at least one opening door. The closure of outward transfer channel ensures that pressure subatmospheric in the fall channel and thereafter the fluidization of the solid particle bath are maintained.
  • the processing device comprising means for transferring the baskets recovery from the start of the game to bring the end of the extraction part.
  • the device comprising means for transferring the baskets recovery from the start of the game to bring the end of the extraction part.
  • a particularly preferred embodiment of the device heat treatment according to the invention comprises means for cooling the fluidized bath.
  • These means of cooling preferably have a cooling channel placed next to the drop channel and intended for recover solid particles heated by overflow at the top of the fluidized bath and reintroduce them into the fluidized bath by lateral vents or an annular passage in a lower part of the chute.
  • a heat transfer fluid exchanger for example water
  • the cooling channel surrounds parts of the fall channel. Particle cooling solids descending into the cooling channel and their reintroduction into the fluidized bath allows the maintaining the fluidized bath at a desired low temperature.
  • a holding zone insulated isotherm follows the extraction part of the channel transfer.
  • heaters are arranged in this area and baskets of recovery are stacked on a dependent descender.
  • the recovery baskets containing the metal parts are kept in this isothermal holding zone at a temperature constant over a period of time, allowing bainitic quenching.
  • the heat treatment device preferably includes a packaging cell for solid particles for the fluidized bath.
  • This cell packaging includes a particle recovery tray solids, a particle fluidization device solids in the recovery tank and thermostating means of the recovery tank at a temperature chosen.
  • the conditioning cell allows to condition solid particles for the internal fluidized bath of the furnace drop channel at a selected temperature outside the fall channel. These conditioned solid particles can then be brought into the fluidized bath in the fall channel by a recovery basket.
  • a device for heat treatment of metal parts comprises a continuous oven 1 for heating metal parts to be treated 100.
  • the metal parts to be treated 100 are transported in bulk on a conveyor belt and pass through a laboratory 11, where they are generally heated to a temperature of several hundred of ° C, so as to be austenized.
  • heated metal parts 100 fall by gravity into a fall channel 12, where finds a fluidized bath 3 of solid particles.
  • the parts metallic 100 quench and reach temperature lower of the bath in a sufficiently short time to allow obtaining the desired final microstructure, both on the surface and at the core.
  • Possible shocks between metal parts 100 or at the bottom of the drop channel 12 are naturally damped by the fluidized bath 3, comparable to a viscous fluid.
  • a recovery basket 52 is placed on a grid of support 41 at the bottom of the fall channel 12 and collects the drenched solid particles falling.
  • the recovery basket 52 has four vertical walls 504-507 and one bottom 501 with a multiplicity of orifices 502 allowing passage the fluidizing gas, but not the solid particles fluidization. Thanks to these orifices, gas from fluidization can be injected into the fluidized bath 3 of solid particles through the recovery basket.
  • Above a cover 503 is arranged on each orifice 502 in the form of a half coated tube open on both sides. These covers 503 prevent solid particles or 100 metal parts fall directly on the orifices 502 and obstruct them.
  • Metal parts 100 accumulate at the bottom of the recovery basket 52 during a predetermined filling time chosen, for example from a few minutes. During this time, the charge of 100 metal parts is constantly crossed by gas fluidization. Other gas distribution systems can be considered.
  • Fluidization gas is injected into the drop channel 12 by a fluidization device 4 placed below the drop channel 12.
  • the fluidization device 4 comprises a diffuser 42 which diffuses the fluidizing gas coming from a pipe 43 through the support grid 41 and the recovery basket 52 in the chute 12.
  • the gas supply to the fluidization device 4 is not not shown. Different fluidization devices usable are known from the state of the art.
  • a horizontally extending transfer channel 6 is connected to the drop channel 12.
  • the transfer channel 6 comprises a supply part 61 through which baskets recovery 51-53 are brought to the bottom of the chute 12 and an extraction part 62 through which the baskets 51-53 are removed from the bottom of the canal fall 12.
  • a recovery basket 51 is found in the intake part 61, a recovery basket 52 in drop channel 12 and a recovery basket 53 in the extraction part 62.
  • the recovery baskets 51 and 53 are at least partially filled with inert solid particles, that is to say non-fluidized, this which is indicated schematically by crossed diagonals on the front wall 505.
  • 100 hardened metal parts are mixed with solid particles.
  • the solid particle bath is fluidized.
  • the start of the supply game 61 and the end of the game 62 are each closed by an opening door 63 respectively 64.
  • the opening doors 63 and 64 have each a closing plate 631 respectively 641 controlled by a cylinder 632 respectively 642.
  • the closure of the transfer channel 6 ensures that the subatmospheric pressure in the fall channel 12 is maintained.
  • a transfer cylinder 65 for the transfer of the recovery basket 51 in the inlet part 61 of the transfer channel 6 is fixed to the closing plate 631 of the door openable 63. Handling of recovery baskets 51-53 is explained below in connection with Figure 5.
  • the device for heat treatment includes, in addition to the first embodiment, means of cooling the fluidized bath 3 in the fall channel 12 and means for recycling of fluidizing gas.
  • the fall channel 12 is surrounded over a large part of its height by a cooling channel 7 which recovers solid particles heated by overflow at the top of the fluidized bath 3 by an annular passage 73 or alternatively by lateral openings in the wall of the canal of fall 12.
  • the solid particles recovered descend in cooling channel 7 and are reintroduced in the fluidized bath 3 by lateral vents 71 or alternately by an annular passage in a part bottom of drop channel 12, just above the basket recovery 52.
  • a heat transfer liquid exchanger 72 is arranged in the cooling channel 7 and allows the cooling of the falling solid particles.
  • the heat of solid particles is extracted by the liquid coolant, for example water.
  • the supply of the pipe 43 of the device fluidization 4 in fresh fluidization gas is adjustable using a gas adjustment valve 45.
  • the flow gas entering line 43 can be measured with a gas flow meter 44.
  • the recycling means here include a recycling channel 8 the inlet of which is connected to the drop channel 12 above of the upper level of the fluidized bath 3. Lateral sockets multiple allow to distribute the aspiration by a suction pump 81 disposed in the recycling channel 8 around the edge of the fall channel 12.
  • the outlet of the fall channel recycling 8 is connected to the fluidization device 4 between gas control valve 45 and the gas flow meter 44.
  • the flow of recycled gas can be adjusted by a valve gas control 82. It can be much more important that the flow rate of fresh fluidizing gas and can reach for example up to ten times the minimum fluidization flow.
  • a system 83 for separating removed solid particles with the sucked gas serves to protect the suction pump 81.
  • This figure shows the transfer of recovery baskets 51-54 in transfer channel 6.
  • a recovery basket 51 is located in the part inlet 61, a recovery basket 52 in the canal fall 12 and a recovery basket 53 in the game 62.
  • the doors 63 and 64 are closed.
  • the door 64 is closed and the recovery baskets 51 and 52 in the transfer channel 6 are pushed from the part inlet 61 in the part of the fall channel 12 and of this part of the fall channel 12 in the extraction part 62, respectively, by the transfer cylinder 65.
  • the transfer cylinder 65 fluidization solid particle bath is maintained to facilitate the translation of the baskets.
  • the duration of the transfer of recovery baskets 51 and 52 is for example a few seconds, which does not necessarily require stopping the fall of metal parts 100.
  • airlocks can be planned.
  • the device shown in Figure 6 is particularly suitable good at bainitic quenching. It has an area insulated support 9 isolated directly after the part extraction 62 of the transfer channel 6. This zone of isothermal support 9 is surrounded by an insulating wall 93 and includes heating elements 92. Its input can be closed by door 64 of transfer channel 6, during that at its exit, a door 94 comprising a closing plate 941 and a cylinder 942 is provided. Inside the insulated holding zone 9, the recovery baskets 54-58 are stacked on a load descender 91. Descenders dependent 91 which allow to evacuate a basket of recovery 59 at the bottom of the stack and get off the others recovery baskets 54-58 are known in the state of technique.
  • the transfer of the next recovery basket 53 from the extraction part 62 of transfer channel 6, which is also isolated in this form of execution, to the descender at load 91 is produced by the attached transfer cylinder 66 to basket 53 using hook 661.
  • a detailed view of the attachment of the recovery basket 53 shows that it in this case has a flip-flop 531 which is pulled by a spring 532 towards the interior of the basket 53.
  • the hook 661 is hooked on the scale 531 on the side of the spring 532 and can be released by a push towards the interior of the basket 53.
  • each recovery basket 51-59 remains in the area of isothermal hold 9 at least 30 minutes.
  • Isothermal maintenance is provided here on the one hand by the mass of the particles inert solids that surround metal parts 100 and on the other hand by the heating bodies 92.
  • the heat treatment device includes in a preferred embodiment a cell conditioning 2 of solid particles for the fluidized bath 3, the conditioning cell 2 comprising a recovery tank 21 for solid particles, a device fluidization 22 of the solid particles in the tank recovery 21 and thermostat 23 means of the recovery tank 21 at a chosen temperature.
  • the separation of particles solid metal parts 100 is performed at using a screening basket 24 which is placed on the tank 21.
  • the mixture of metallic parts 100 and of solid particles from the recovery basket 59 is poured into the screening basket 24 which retains only the metal parts 100.
  • the solid particles fall in the recovery tank 21 and are fluidized in this tank by the fluidization device 22.
  • thermostatization means 23 for example a exchanger with water circulation or electric heating elements, both controlled by a regulator and a rod pyrometric, solid particles in the recovery tank 21 are conditioned until they have the treatment temperature chosen for the fluidized bath 3 in the fall channel 12. If it is a martensitic quench, this temperature is if possible below the martensitic transformation end temperature Mf of hardened steel, for example 30 ° C. If it is a hardening bainitique, this temperature is higher than the temperature of martensitic transformation Ms of hardened steel, for example 320 ° C.
  • the screening basket 24 containing the metal parts 100 is removed from the drip tray 21, as shown in FIG. 8.
  • a basket of recovery 51 is filled with solid particles freshly reconditioned. Using the solid particles of this recovery basket 51, the fluidized quench bath 3 in the drop channel 12 can be partially renewed.
  • transfer cylinders 65 and 66 other organs of transfer responsible for translating the recovery baskets 51-59 in transfer channel 6 are conceivable.
  • the parts to be treated are automatically loaded in bulk on the belt, in a uniform homogeneous layer.
  • the size of the recovery baskets is 600 mm wide by 400 mm long, with a height of 150 mm.
  • the rate of transfer of the baskets is chosen at 6 minutes, or 24 kg of pieces per basket.
  • the temperature of the fluidized bath is adjusted below the Mf value of the steel, for which the martensitic transformation is complete, for example 50 ° C.
  • the bath is made up of corundum-type sand particles with an average particle size of 200 microns.
  • the fluidizing gas is cold nitrogen (N 2 ), at a rate of 1.5 times the minimum fluidization flow.
  • This gas fills the drop channel and then the laboratory of the continuous furnace, where it is completed by additions of gas guaranteeing the surface integrity of the treated parts, for example propane (C 3 H 8 ).
  • propane (C 3 H 8 ) propane (C 3 H 8 ).
  • the hardened parts show a hardness greater than 650 HV (Vickers hardness) after quenching, are clean in appearance, and do not require washing before tempering, which is done in an ad hoc installation, for example a fluidized bath.
  • the mass of fluidized sand is partially renewed every 6 minutes, by adding the contents of the newly placed basket.
  • Each basket load represents for example between 5 and 20% of the total fluidized.
  • the parts to be treated are automatically loaded in bulk on the belt, in a uniform homogeneous layer.
  • the size of the recovery baskets is 600 mm wide by 400 mm long, with a height of 150 mm.
  • the basket transfer rate is chosen to be 6 minutes, or 20 kg of pieces per basket.
  • the bath temperature is adjusted above the martensitic transformation start temperature Ms of the steel, so as to allow bainitic isothermal transformation of the parts, for example 300 ° C.
  • the fluidized bath is formed of ZrO 2 type sand particles with an average particle size of 100 microns.
  • the fluidizing gas is a mixture of nitrogen (N 2 ) and 20% hydrogen (H 2 ), at a rate of 2 times the minimum fluidization rate.
  • This gas fills the drop channel and then the laboratory of the continuous furnace, where it is completed by additions of gas guaranteeing the surface integrity of the treated parts, for example propane (C 3 H 8 ).
  • propane (C 3 H 8 ) propane
  • the sand is heated to working temperature in a conditioning cell.
  • the mass of fluidized sand is partially renewed every 6 minutes, by the hot addition of the contents of the newly placed basket.
  • Each basket load represents for example between 5 and 20% of the total fluidized.
  • the heat provided by the quenched parts also helps maintain the bath at constant temperature.
  • This basket and its load of sand and temperature pieces can then be routed to the area of insulated insulated support, where the baskets are stacked every 6 minutes. Isothermal maintenance is ensured here by the mass of inert sand that contains the parts. After the bainitic transformation time, typically 30 minutes, the basket which has just made 5 isothermal stations is extracted from the isothermal holding zone. The parts and the sand is separated, and the basket is filled with sand hot reconditioned to be re-charged in the next cycle. The hardened parts are cooled to room temperature, which gives them a blue color specific to oxidation undergoing air cooling. After this bainitic transformation, they have a higher hardness at 48 HRC (Rockwell hardness), are clean in appearance, and do not do not require washing after quenching. They have all its own efficient mechanical characteristics to this type of structure.
  • HRC Rockwell hardness

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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)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
EP20010811070 2000-11-15 2001-11-06 Vorrichtung zur Wärmebehandlung von metallischen Werkstücken Withdrawn EP1207211A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH22262000 2000-11-15
CH22262000 2000-11-15

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Publication Number Publication Date
EP1207211A2 true EP1207211A2 (de) 2002-05-22
EP1207211A3 EP1207211A3 (de) 2004-02-04

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2397071A (en) * 2003-01-13 2004-07-14 Boc Group Plc Quenching method and quenching chamber
CN110629006A (zh) * 2019-09-30 2019-12-31 卓爱忠 一种工业生产用淬火件取出手臂

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8426455D0 (en) * 1984-10-19 1984-11-28 Bekaert Sa Nv Fluidised bed apparatus
US4730811A (en) * 1985-08-20 1988-03-15 Kabushiki Kaisha Komatsu Seisakusho Heat treatment apparatus with a fluidized-bed furnace
DE4116215A1 (de) * 1991-05-17 1992-11-19 Hilti Ag Trommelfoermige transporteinrichtung
DE4116216A1 (de) * 1991-05-17 1992-11-19 Hilti Ag Abkuehlstrecke

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2397071A (en) * 2003-01-13 2004-07-14 Boc Group Plc Quenching method and quenching chamber
CN110629006A (zh) * 2019-09-30 2019-12-31 卓爱忠 一种工业生产用淬火件取出手臂
CN110629006B (zh) * 2019-09-30 2021-07-13 聊城市飓风工业设计有限公司 一种工业生产用淬火件取出手臂

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