EP0562250B1 - Verfahren und Vorrichtung zum Abschrecken metallischer Werkstücke - Google Patents

Verfahren und Vorrichtung zum Abschrecken metallischer Werkstücke Download PDF

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Publication number
EP0562250B1
EP0562250B1 EP93101876A EP93101876A EP0562250B1 EP 0562250 B1 EP0562250 B1 EP 0562250B1 EP 93101876 A EP93101876 A EP 93101876A EP 93101876 A EP93101876 A EP 93101876A EP 0562250 B1 EP0562250 B1 EP 0562250B1
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EP
European Patent Office
Prior art keywords
quenching
nozzle array
nozzle
gas
cooling gas
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EP93101876A
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German (de)
English (en)
French (fr)
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EP0562250A1 (de
Inventor
Joachim Dr.-Ing. Wünning
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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
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/613—Gases; Liquefied or solidified normally gaseous material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races

Definitions

  • the invention also relates to a device for carrying out this method, in particular for treating rotationally symmetrical workpieces, such as rings, gearwheels, disks, shafts and the like, with a quenching chamber in which at least one, at least partially delimited by a nozzle field, is used to hold individual workpieces Space is provided.
  • a quenching chamber in which at least one, at least partially delimited by a nozzle field, is used to hold individual workpieces Space is provided.
  • Quenching systems for hardening workpieces made of steel and other metals are of great importance in technology because they significantly improve the performance properties of the workpieces. Quenching in water or oil, as well as in salt baths or in a fluidized bed, has long been known. Recently, the cooling of the workpieces in the gas stream has also been used, with a heat-treated batch with cooling gas flowing in a circuit flowing in a cooling chamber, which is brought into effect in the form of discrete jets on the workpiece surface to be cooled. An industrial furnace equipped with such a quenching device is described in EP 0151 700 A2.
  • the size of the heat flow density that can be achieved in each case depends, among other things, on the heat transfer coefficient ⁇ (W / m 2 K).
  • H-value a characteristic value, the so-called H-value, is used to describe the quenching effect or intensity according to Grossmann (MA Grossmann, M.Asimov, SF Urban “The Hardenability of Alloy Steel", ASM Cleveland, 1939, Pages 124 to 190) are used.
  • Gas quenching is usually used in an H-value range from 0.1 to 0.2 (cf., for example, "Handbuch der Fabrication Technology", Carl Hansen Verlag Kunststoff Vienna, Volume 4/2, page 1014). Higher values up to ⁇ 0.5 corresponding to a heat transfer coefficient ⁇ ⁇ 1000 W / m 2 K have hitherto only been achieved using hydrogen and / or helium - or corresponding mixtures - as cooling gas under high overpressure (EP 0 313 888 A1 and WO 89 / 12 111).
  • the object of the invention is to remedy this and to provide a quenching method and a quenching device suitable for carrying out this method, which allow a high quenching intensity in the H-value range of approximately 0.2 to 4 to be achieved without quenching having to put up with the aforementioned problems.
  • the quenching method according to the invention has the features of patent claim 1.
  • the new method enables the quenching of metallic workpieces to be operated with the high quenching intensity values known for salt, oil or water quenching, without having to accept the disadvantages described at the outset, which are known when using non-gaseous quenching media.
  • the quenching intensity can be reproducibly controlled within a few seconds.
  • the regulation can be carried out in a simple manner by a corresponding intervention on the cooling gas-promoting fan acting on the nozzle field and / or the cooling gas pressure in the system.
  • Air, nitrogen or a gas mixture can be used as the cooling gas, it being expedient in particular in cases in which the heat treatment preceding the quenching took place in a protective gas atmosphere to use the protective gas as the cooling gas.
  • the cooling gas may contain hydrogen or another gas with a higher thermal conductivity than air in a proportion of 0 to 100% by volume. This hydrogen can also be added to the cooling gas. The addition simultaneously reduces the drive power of the fan that conveys the cooling gas.
  • the new process is used for quenching hollow, especially ring or tubular workpieces. Impingement jets of the cooling gas are brought to bear both on the outer and on the inner lateral surface and optionally on the end face of the workpiece from a nozzle field adapted to the shape of the workpiece. Finally, it can be advantageous if, during quenching, a relative movement between the workpiece surface to be cooled and the impact jets of the nozzle field is maintained at least temporarily, for example by rotating an annular or disk-shaped workpiece - or the nozzle field - while the other Part stands still.
  • a quenching device set up to carry out the new method has the features of claim 11.
  • At least some of the nozzles in the nozzle array can be provided with selectively operable throttling and / or closing means in order to influence, in particular to dampen, the quenching effect at certain points on the surface of the workpiece, if necessary.
  • the nozzle field can also be formed, at least in part, on an insert that is interchangeably inserted into the quenching chamber, so that the quenching device can be easily adapted to any workpiece shape. As a rule, a special nozzle array is required for each workpiece shape.
  • Drive means for rotating it in particular a rotationally symmetrical workpiece and / or at least a part of the nozzle field, can be provided in the quenching chamber.
  • These drive means can either be designed to act from outside the quenching chamber and / or have a turbine element which can be acted upon by cooling gas and which has the advantage that no additional drive source is necessary.
  • a turbine element which can be acted upon by cooling gas and which has the advantage that no additional drive source is necessary.
  • the space delimited by the nozzle field in the quenching chamber can also be designed as a pressure space, so that the pressure in the quenching system can be increased during the quenching process, which further increases the cooling effect.
  • the quenching intensity is controlled in its time course, and thus the temperature / time course of the cooling of the workpiece in accordance with the requirements of the respective workpiece and its material in a predetermined reproducible manner or can be regulated.
  • the quenching device can have a process computer for controlling the chronological course of the cooling process, the process signals such as volume flow, pressure, temperature and composition of the cooling gas etc. and workpiece-specific data such as geometric shape and dimensions, material composition etc.
  • Program control means can also improve the cooling effect on the workpiece surface to be cooled by correspondingly influencing the speed and / or pressure of the impact jets and / or the effective passage cross section of nozzles of the nozzle array in the sense of simulating the quenching effect of an oil or water bath hardening. In this way, by throttling the cooling effect according to a predetermined temperature / time curve by correspondingly reducing the cooling gas speed and / or the cooling gas pressure etc., the effect of oil or hot bath hardening in salt can be imitated.
  • the quenching device is located directly at the outlet of the furnace chamber containing a protective gas atmosphere of a continuous continuous furnace , in particular a roller hearth furnace, is connected essentially gas-tight.
  • the quenching device can have a loading and unloading chamber which is connected to the furnace chamber and which is closed to the outside by an optionally operable door.
  • the loading and unloading chamber can also be connected to the space delimited by the nozzle field by means of selectively operable closure means, which allow the quenching process to be carried out under cooling gas overpressure, at least temporarily.
  • the quenching device can also have a plurality of quenching chambers arranged next to one another and which can be operated parallel to one another.
  • the arrangement can be such that the quenching device has a plurality of quenching chambers located one behind the other, which are optionally connected to one another by a transport device with the interposition of other treatment stations, for example for calibrating the workpieces, the quenching chambers being set up for operation with different quenching effects. This makes it possible, for example, to achieve step cooling with different cooling gas inlet temperatures.
  • the quenching effect known as the quenching intensity
  • the quenching intensity which can be achieved on the workpiece with known quenching systems, which in particular use gas, salts, oil or water, is described by the so-called H value in the left part of the diagram in FIG. 1. It follows that in the practical H-value range of about 0.05 to 4, the greatest quenching intensity, i.e. the most abrupt cooling, previously only possible with water as a quenching medium.
  • the H-value for a water quenching system is approx. 0.8 to 4.
  • With oil as a quenching medium depending on whether the quenching is mild or abrupt, H-values of approx. 0.3 to 1 can be achieved, while hot bath quenching systems work in salt with an H value of approx. 0.2 to 0.4.
  • H value has hitherto been on the order of 0.1.
  • the cooling gas in the form of discrete impingement jets emerging from a nozzle field is applied to the workpiece surface to be cooled Brought into action, the quenching intensity being regulated in a controllable manner by appropriate selection of gas jet parameters, in particular the gas velocity W, the gas pressure P, the gas jet cross-sectional area and the number of impact jets per unit area.
  • the quenching device 1 (FIG. 2) has a housing 2 which carries an all-round connecting flange 3 with which it is attached in a gas-tight manner to the outer wall of a roller hearth furnace 4, the furnace chamber of which is designated 5 and the roller hearth is indicated at 6.
  • the essentially box-shaped housing 2 forms the actual quenching chamber.
  • a cup-shaped cylindrical insert 5 is inserted from above, with an edge Flange 6 is sealed onto a corresponding annular shoulder 7 of a housing wall 8 enclosing it at a lateral distance.
  • the insert 5 is formed with a hollow cylindrical middle part 9, which is closed on the upper end face by an integrally formed end wall 10 and which on the opposite end side adjoins a likewise integrally formed, radially outwardly extending circular annular surface 11, which is formed into an integrally formed outer cylindrical Wall 12 merges, which is arranged coaxially to the inner cylinder wall 13 of the middle part 9.
  • the outer and inner cylinder walls 12, 13 together with the annular wall 11 enclose a cylindrical annular space 14, the size of which is dimensioned in the axial and radial directions such that it can just accommodate a roller bearing ring 15 which forms the workpiece to be cooled.
  • the annular space 14 is closed during the quenching process by an optionally operable cover 16, which in the closed position shown in FIG.
  • the cover 16 is connected to the piston rod 18 of a pneumatic lifting cylinder 19 which is fastened on a hood 20 which forms part of the housing 2 and which, together with the insert 5 and the housing side wall 8, delimits a loading and unloading space 21.
  • the loading and unloading space 21 is connected directly to the furnace chamber 5 via the furnace outlet 22, ie without an interposed lock. It is closed on the opposite side by a door 23 which can optionally be opened and closed.
  • a tray 24 is placed in alignment with the top of the insert 5 on the housing side wall 8.
  • the inner and outer cylinder walls 12, 13 of the insert 5 are provided with radial cylindrical nozzle bores 25 which are arranged essentially horizontally parallel to one another.
  • Each of the nozzle bores 25 is formed on the outside of the outer cylinder wall 12 and on the inside of the inner cylinder wall 13 with a funnel-shaped countersink 26.
  • the nozzle bores 25 opening into the annular space 14 from both sides form a nozzle field which, over its axial height, laterally delimits the annular space 14 both on the inside and on the outside.
  • the nozzle bores 25 are acted upon by a cooling gas which is supplied via a line connection 27 to a pressure chamber 28 formed in the housing 2, which is closed at the top by the insert 5 in the manner shown in FIG. 2 and which seals the inner and the outer Cylinder wall 12, 13 and the annular wall 11 surrounds one side.
  • the cooling gas flowing through the nozzle bores 25 of the nozzle field into the annular space 14 is passed via at least two line stubs 30, which pass through the annular wall 11 and the bottom wall 29 of the pressure chamber 28, into a collecting space 31 of the housing 2, which is connected to a line connection 32 and below of the pressure chamber 28 is arranged.
  • Support means for the roller bearing ring 15 to be quenched are arranged in the annular space 14, each holding the ring at the correct height and at the correct distance with respect to the nozzle bores 25 of the nozzle field.
  • These support means are designed in the described embodiment in such a way that they hold the roller bearing ring 15 held coaxially to the insert 5 and radially centrally between the nozzle field sections in the outer and inner cylinder walls 12, 13 during the quenching process by the one indicated at 33 (FIG. 2) Can set axis of insert 5 in rotation.
  • drive and support means consist of a number of juxtaposed collar rollers 34, the length of which is slightly shorter than the radial width of the annular space 14 accommodating them, and which sit on radial shafts 35, which are sealed in corresponding bearings of the inner and outer cylinder walls 14 are mounted.
  • Each shaft 35 carries on its end part lying in the cavity of the inner part 9 a wedge bevel gear 36 which is in engagement with a common ring gear 37.
  • the ring gear 37 is in turn seated on a drive shaft 38 which is rotatably mounted coaxially to the axis 33 in a corresponding bearing bore 39 of the housing 2.
  • the shaft 38 is set in rotation by a drive source, not shown, in the sense of the arrow indicated at 40 in FIG. 2. In the area of their Implementation through the pressure chamber 28, it is sealed at 41.
  • FIG. 2 An alternative embodiment is shown in FIG. 2 to the right of the axis 33.
  • the drive and support means are formed by a turbine ring 42 which is rotatably mounted in the annular space 14 on the annular wall 11 and the inner cylinder wall 13.
  • the turbine ring 42 has a blading indicated at 43 on which the roller bearing ring 15 rests. It is driven during operation via nozzle bores 25 which are arranged in the region of the ring wall 11 below the turbine ring 43 and can be acted upon by cooling gas from the pressure chamber 28.
  • FIGS. 3, 4 The structure of the nozzle field formed by the nozzle bores 25 is illustrated in detail in FIGS. 3, 4 on the basis of a schematic model of the insert 5 and the housing 2 surrounding it. In this model representation, the same parts are provided with the same reference numerals with FIG. 2.
  • the cylindrical nozzle bores 25 with the same diameter d and the same nozzle pitch t are arranged in the nozzle field.
  • the nozzle field comprises three rows of nozzle bores arranged at equal intervals t, ie corresponding to the lateral nozzle pitch t (cf. FIG. 3).
  • the roller bearing ring 15 to be deterred is only in the annular space 14 the support edges 44 indicated drive and support means are arranged at such a height coaxially to the axis 33 that it lies in the axial direction symmetrically to the three rows of nozzle bores lying one above the other (see Fig. 3).
  • roller bearing ring 15 is seated radially centrally in the annular chamber 14, which means that the radial distance h between the nozzle field and the outer or inner peripheral surface of the roller bearing ring is the same. Since the nozzle bores 25 of the nozzle field are oriented at right angles to the axis 33, they are also directed at right angles to the inner and outer circumferential surface of the roller bearing ring 15. Gas jets emerging from the nozzle bores 25 therefore strike the outer and inner circumferential surface of the roller bearing ring 15 in the form of discrete impact jets.
  • Nozzle bore pitch t 4 d to 8 d
  • Distance of the nozzle field from the workpiece surface to be cooled h 2d to 8d.
  • the gas velocity w 40 to 200 m / sec. at the outlet of the nozzle bores 25.
  • the nozzle field can be adapted in a simple manner by exchanging the inserts 5 to different dimensions and sizes of the roller bearing rings 15 or other ring-shaped workpieces to be quenched. It is important in any case that the nozzle field follows the shape of the workpiece to be cooled as closely as possible in order to ensure that the workpiece surface to be cooled is acted upon as uniformly as possible with impingement jets of the cooling gas emerging from the nozzle bores 25 of the nozzle field. In the treatment of ring-shaped or disk-shaped workpieces, gearwheels and the like, different designs of the insert 5 and its parts carrying the nozzle field result in accordance with the workpiece shape. As in the present case, the nozzle field can consist of several sections which cool workpiece surfaces inside and outside or above and below. The nozzle bore diameter d and the distance h to the workpiece surface to be cooled are always relatively small.
  • the quenching device 1 is connected directly to the outlet of the roller hearth furnace 4, the basic structure of which is described, for example, in DE-PS 38 16 503.
  • the cover 16 When the cover 16 is open, the annular space 14 is therefore in direct contact with the furnace chamber 5, which contains a protective gas atmosphere.
  • the heating of the rolling bearing rings 15 and their subsequent quenching in the nozzle field of the quenching device 1 are common Protective gas space instead of what allows to save protective gas and to avoid the time that would otherwise be required for any lock operations.
  • the risk of explosion when hydrogen is added to the protective gas is simultaneously reduced to a minimum.
  • the cover 16 (FIG. 2) can also be omitted if, given the shape and the material of the workpiece to be cooled, it is possible to find the deliveries in the annular space 14 with a relatively low cooling gas pressure. It is also possible to carry out the heating and quenching in the nozzle field of the quenching device 1 in a common overpressure space formed by the furnace chamber 5 and the annular space 14, if the walls of these spaces are designed to be overpressure-resistant. This also eliminates the pressure lock formed by the cover 16.
  • the cooling gas supply of the quenching device 1 is illustrated in FIG. 5:
  • the blower 45 which supplies cooling gas to the pressure chamber 28 on the pressure side via the line connection 27, is connected on the suction side via a gas cooler 46 with a coolant actuator 47 to the line connection 32 of the housing 2.
  • a gas expansion tank 50 is connected via a control valve 49, from which a waste gas line 52 branches off via a pressure regulator 51, which optionally leads back into the furnace chamber 5.
  • On the pressure side of the blower 45 are connected to its pressure line 53 via control valves 54, 55, two compressed gas cylinders 56, 57, which contain additional gas, for example, hydrogen and / or nitrogen.
  • these sensors are connected to a process computer 62, to which they transmit signals that are characteristic of the parameters they monitor.
  • the process computer 62 receives signals indicative of the actual temperature of the roller bearing ring 15 to be quenched, which signals are supplied by a temperature sensor 63 which senses the outer peripheral surface of the roller bearing ring via a window 64 inserted pressure-tight into the housing side wall 8 and the insert 5.
  • the process computer 62 calculates from the process-specific signals received by the sensors 58 to 61 (flow rate, temperature, pressure and composition of the cooling gas) and from previously entered data which are characteristic of the workpiece 15 to be treated (geometry and material values) and the nozzle field Output signals for controlling the blower 45, the control valves 54, 55 of the coolant control valve 47 influencing the additional gas quantity and the control valve 49 leading into the expansion tank 50. Together with the signals received from the temperature sensor 63 for the actual temperature of the workpiece 15, the process computer 62 regulates in this way automatically the quenching process the workpiece located in the annular space 14, whereby it can largely regulate any predetermined temperature-time profile on the surface of the workpiece 15 to be cooled.
  • the workpieces in the form of the roller bearing rings 15 on the roller hearth 6 are continuously guided through the furnace chamber 5 and heated to hardening temperature in the protective gas atmosphere contained therein.
  • the roller bearing rings 15 pass one after the other through the furnace outlet 22 (FIG. 2) into the loading and unloading space 21 of the quenching device 1, the cover 16 of which is in the open upper position when the door 23 is closed.
  • the roller bearing ring 15 arriving in the loading and unloading chamber 21 falls into the annular chamber 14, in which it comes to lie in the correct position on the drive and / or support means, for example on the collar rollers 35 or the turbine ring 42.
  • the lid 16 is then closed; the blower 45 (FIG. 5) is switched on and the pressure chamber 28 is acted upon by cooling gas, which is the same protective gas as is contained in the furnace chamber 5.
  • the cooling gas emerging from the nozzle bores 25 impinges in the form of impact jets on the outer and inner circumferential surface of the roller bearing ring 15 to be cooled, where it causes a rugged, uniform cooling of the rotating roller bearing ring 15.
  • the cooling gas flowing out of the roller bearing ring 15 is discharged from the blower 45 via the line connection piece 30 sucked off, the amount of heat absorbed is withdrawn in the gas cooler 46.
  • the temperature-time profile of the cooling is controlled by the process computer 62 in the manner already described.
  • the fan 45 is turned off, the cover 16 is opened and the cooled roller bearing ring 15 is removed from the annular space 14 by a manipulator (not shown) and placed on the storage table 24 with the door 23 open for a short time. After closing the door 23, the quenching device is ready for cooling the roller bearing ring 15 which is brought up next by the roller hearth.
  • the quenching intensity that can be achieved in the nozzle field by gas quenching in the manner described is illustrated in the diagram of FIG. 1 on the right in comparison with the quenching intensities that can be achieved in the known quenching systems , 2.4 and 8 mm.
  • the nozzle pitch t and the nozzle field distance h are 5 x d.
  • the gas velocity w is 100 m / sec.
  • the power of the blower 45 required for gas production is approximately N ⁇ 50 xp. (1 -0.009. Vol% H 2nd ) in kW per m 2 nozzle field, in no case does it exceed a maximum limit of 1000 kW per m 2 of nozzle field.
  • the gas pressure p entered on a scale between 1 and 8 bar.
  • Nozzle bore diameters ⁇ 1 mm can only be used in special cases due to the risk of contamination and the small distance.
  • the quenching intensity can be increased by increasing the pressure p of the cooling gas and by reducing the nozzle bore diameter d at a small distance h.
  • a further increase can be compared by adding a gas achieve air with high thermal conductivity, especially hydrogen, which is often contained in protective gases from the furnace anyway.
  • a helium additive would have a comparable effect, but is generally not an option for economic reasons.
  • the quenching device explained with reference to FIGS. 2 to 5 has been attached to a continuous continuous furnace, for example the roller hearth furnace 4, etc. the advantage that it can be arranged together with the continuous furnace directly in a production line for workpieces that require heat treatment and subsequent quenching before they are processed further. In the case of oil quenching systems, for example, this is not readily possible because of the fire risk involved.
  • the entire heat treatment process can be automated, whereby the workpiece throughput per unit of time can also be increased if necessary, while at the same time there is the possibility of cooling the workpieces, if necessary, with different gas inlet temperatures in the individual stages, possibly even with intervening operations for calibrating the workpieces, etc. , to subjugate. This is briefly explained with reference to FIG. 6:
  • the roller bearing rings 15 in three rows on the roller hearth 6 of the roller hearth furnace 4 transported in parallel through the furnace chamber 5.
  • a subsequent outlet-side section 66 of the roller hearth 6 leading to the quenching device is driven by an overdrive drive 67 which increases the distance to the roller bearing ring row the subsequent row of roller bearings is transported through the furnace outlet 22 into a first cooling station A.
  • the cooling station A three quenching devices 1 are accommodated in parallel next to one another in a common housing 68 which is flanged directly to the outlet side of the roller hearth furnace 4 and whose cooling gas inlets and outlets are indicated in FIG. 6 by two arrows 69, 70.
  • Each of the quenching devices 1 is designed in accordance with FIG. 2.
  • manipulators After the roller bearing rings lying in parallel side by side have simultaneously cooled in the three quenching devices 1 of the first cooling station A to a predetermined first temperature value, manipulators (not shown further) transfer them to the three downstream quenching devices 1 of a second cooling station B of the same design, in which the cooling takes place Room temperature takes place, whereupon the workpiece group consisting of three roller bearing rings 15 lying next to one another is transported away via the common storage table 24.
  • a ring 15 of a roller bearing made of material 100 Cr6 is hardened in the nozzle field instead of the usual oil quenching.
  • Workpiece data Outer diameter: 140 mm Inside diameter: 116 mm Ring width: 40 mm
  • the nozzle field 2 (FIG. 1) is selected for the ring size and width.
  • Nozzle array 2 Nozzle diameter d: 2 mm
  • Nozzle pitch t 10 mm
  • Cooling gas 50 ° C) 40% N2.20% CO, 40% H2 (vol.%) Endogas from natural gas Total pressure P 2.5 bar (according to Fig.
  • the blower output in variant 1 is comparable to that of a circulation pump in an oil bath. With a cooling time of approx. 20 seconds per ring, the energy requirement per kg hardness is 0.01 kWh for variant 1 and 0.04 kWh for variant 2.
  • the temperature in the core of the rotating ring has cooled to 500 ° C. after 10 seconds. After 18 seconds, 280 ° C is reached on the surface of the ring (optical control) and the cooling is switched off (cooling station A).
  • phase II the ring can be calibrated at a defined temperature before the formation of martensite.
  • phase III the ring is cooled in a further nozzle station with a supercooled circulating gas to about 0 ° C. for the complete formation of martensite (cooling station B).
  • the critical cooling time from 800 to 500 ° C, which in the example is about 10 seconds, can be even shorter for unalloyed and low-alloy steels.
  • the very fast control of the quenching effect required for this and the very short movements of the quenching device 1 required for this purpose, in contrast to the conditions in known gas cooling devices, can easily be achieved with the invention in a reproducible, economical manner.
  • the necessary heat transfer between the workpiece surface to be cooled and the gas flow with high values of the heat transfer coefficient ⁇ can be achieved with the nozzle fields with a relatively small nozzle diameter d and small distance h to the workpiece surface to be cooled.
  • the nozzle array is equipped with cylindrical nozzle bores 25.
  • other cross-sectional shapes for example slot nozzles or the like, which is pointed out for the sake of order.
  • All gases and gas mixtures which can be used for the respective purpose including air, nitrogen and the like, can be used as the cooling gas.
  • the workpieces 15 are quenched individually, because it is usually only possible in this way to adapt the nozzle field closely enough to the shape of the workpiece surface to be cooled and at a sufficiently small distance to arrange this.
  • roller bearing ring 15 is rotated relative to the stationary nozzle field during cooling.
  • the arrangement could of course also be such that the roller bearing ring 15 is fixed while the insert 5 and thus the nozzle field execute a rotary movement.
  • Axial up and down movements of the workpiece and / or the nozzle field are also conceivable and can be achieved with simple mechanical means.

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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)
  • Heat Treatment Of Articles (AREA)
EP93101876A 1992-03-17 1993-02-06 Verfahren und Vorrichtung zum Abschrecken metallischer Werkstücke Expired - Lifetime EP0562250B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4208485 1992-03-17
DE4208485A DE4208485C2 (de) 1992-03-17 1992-03-17 Verfahren und Vorrichtung zum Abschrecken metallischer Werkstücke

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EP0562250A1 EP0562250A1 (de) 1993-09-29
EP0562250B1 true EP0562250B1 (de) 1997-11-19

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US (1) US5452882A (ja)
EP (1) EP0562250B1 (ja)
JP (1) JPH0610037A (ja)
AT (1) ATE160382T1 (ja)
DE (2) DE4208485C2 (ja)

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DE4422588C2 (de) * 1994-06-28 1999-09-23 Ald Vacuum Techn Gmbh Verfahren zum Abschrecken von Werkstücken durch Gase und Wärmebehandlungsanlage zur Durchführung des Verfahrens
DE19501873C2 (de) * 1995-01-23 1997-07-03 Ald Vacuum Techn Gmbh Verfahren und Vorrichtung zum Abkühlen von Werkstücken, insbesondere zum Härten
TW420718B (en) * 1995-12-26 2001-02-01 Nippon Steel Corp Primary cooling method in continuously annealing steel strip
DE29603022U1 (de) * 1996-02-21 1996-04-18 Ipsen Ind Int Gmbh Vorrichtung zum Abschrecken metallischer Werkstücke
AT405190B (de) * 1996-03-29 1999-06-25 Ald Aichelin Ges M B H Verfahren und vorrichtung zur wärmebehandlung metallischer werkstücke
NL1006539C2 (nl) * 1997-07-10 1999-01-12 Skf Ind Trading & Dev Werkwijze voor het uitvoeren van een warmtebehandeling op metalen ringen, en aldus verkregen lagerring.
DE19845805C1 (de) * 1998-09-30 2000-04-27 Tacr Turbine Airfoil Coating A Verfahren und Behandlungseinrichtung zum Abkühlen von hocherwärmten Metallbauteilen
DE19920297A1 (de) * 1999-05-03 2000-11-09 Linde Tech Gase Gmbh Verfahren zur Wärmebehandlung metallischer Werkstücke
FR2801059B1 (fr) * 1999-11-17 2002-01-25 Etudes Const Mecaniques Procede de trempe apres cementation a basse pression
GB9929956D0 (en) * 1999-12-17 2000-02-09 Boc Group Plc Qenching heated metallic objects
DE19961208B4 (de) * 1999-12-18 2008-07-17 Air Liquide Deutschland Gmbh Vorrichtung und Verfahren zum Kühlen von Werkstücken mittels Gas
GB0029281D0 (en) * 2000-11-30 2001-01-17 Boc Group Plc Quenching Method & Apparatus
US20030098106A1 (en) * 2001-11-29 2003-05-29 United Technologies Corporation Method and apparatus for heat treating material
FR2844809B1 (fr) * 2002-09-20 2007-06-29 Air Liquide Procede de refroidissement rapide de pieces par transfert convectif et radiatif
GB0319061D0 (en) * 2003-08-14 2003-09-17 Rolls Royce Plc A method of heat treating titanium aluminide
US20050241147A1 (en) * 2004-05-03 2005-11-03 Arnold James E Method for repairing a cold section component of a gas turbine engine
US20090277009A1 (en) * 2004-01-09 2009-11-12 Mtu Aero Engines Method for manufacturing and/or machining components
US20060103059A1 (en) 2004-10-29 2006-05-18 Crafton Scott P High pressure heat treatment system
DE102005015450B3 (de) * 2005-04-04 2006-08-17 Ipsen International Gmbh Verfahren sowie Vorrichtung zur Gasabschreckung
JP4458079B2 (ja) 2006-09-27 2010-04-28 株式会社Ｉｈｉ 真空浸炭処理装置
JP4458107B2 (ja) * 2007-03-09 2010-04-28 株式会社Ｉｈｉ 真空浸炭処理方法及び真空浸炭処理装置
WO2008121671A2 (en) * 2007-03-29 2008-10-09 Consolidated Engineering Company, Inc. Vertical heat treatment system
DE102008063478A1 (de) * 2008-12-17 2010-07-08 Audi Ag Vorrichtung zur Abkühlung von Hohlprofilbauteilen
CN103534547B (zh) * 2011-02-28 2015-08-19 株式会社Ihi 热处理品的温度测定装置和温度测定方法
US20130129570A1 (en) * 2011-04-20 2013-05-23 Siliconvalue Llc. Polycrystal silicon manufacturing apparatus
CN102230060A (zh) * 2011-06-29 2011-11-02 十堰恒进科技有限公司 一种环形轨道整体淬火装置
EP2604710A1 (en) * 2011-12-13 2013-06-19 Linde Aktiengesellschaft Method for hardening of a metallic workpiece
PL228193B1 (pl) * 2014-10-06 2018-02-28 Seco/Warwick Społka Akcyjna Urzadzenie do jednostkowego hartowania czesci urzadzen technicznych
US10344346B2 (en) * 2015-04-09 2019-07-09 National Oilwell Varco, L.P. Wellbore tubular air quenching
DE102016110677B4 (de) * 2016-06-09 2018-07-12 Ebner Industrieofenbau Gmbh Temperiervorrichtung für Bauteile
CN109321725B (zh) * 2018-12-03 2023-12-22 宁夏机械研究院股份有限公司 限形淬火脱模装置
DE102019204869A1 (de) * 2019-04-05 2020-10-08 Audi Ag Abschreckvorrichtung zur chargenweisen Abschreckkühlung von Metallbauteilen
WO2021040644A1 (en) * 2019-08-23 2021-03-04 Ortadogu Rulman Sanayi Ve Ticaret Anonim Sirketi Bearing race cooling system
CN110760651A (zh) * 2019-11-05 2020-02-07 浙江辛子精工机械有限公司 一种改善轴承套圈变形的压模淬火整形设备
CN114525386B (zh) * 2022-02-18 2024-05-24 滨州学院 一种乘用车轮毂热处理用的可调式喷淋淬火装置及方法
CN114959211B (zh) * 2022-03-23 2024-02-09 中国机械总院集团北京机电研究所有限公司 一种一机多用式大型铝合金工件淬火设备
CN115125375B (zh) * 2022-06-30 2023-05-30 东风商用车有限公司 一种用于薄壁内齿圈的压淬装置

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1533639A (en) * 1924-07-11 1925-04-14 Timken Roller Bearing Co Quenching apparatus
US3294599A (en) * 1963-07-30 1966-12-27 Smith Corp A O Method and apparatus for heat treating low carbon steel
US3782705A (en) * 1971-12-14 1974-01-01 Hayes Inc C I Continuously operated vacuum furnace having work part transfer conveyor and load and unload mechanism
DE2601658C3 (de) * 1976-01-17 1978-11-30 Fa. J.F. Mahler, 7300 Esslingen Kühlvorrichtung für einen an der Ein- und Auslaßseite offenen Durchlaufofen zum Wärmebehandeln von Werkstücken
US4171126A (en) * 1978-03-13 1979-10-16 Midland-Ross Corporation Vacuum furnace with cooling means
DE3302338A1 (de) * 1983-01-25 1984-07-26 Ruhrgas Ag, 4300 Essen Verfahren zum haerten von metallwerkstuecken
DE3307071C2 (de) * 1983-03-01 1986-05-22 Joachim Dr.-Ing. 7250 Leonberg Wünning Durchlaufofen für die Wärmbehandlung von metallischen Werkstücken
DE3322386A1 (de) * 1983-06-22 1985-01-10 Schmetz Industrieofenbau und Vakuum-Hartlöttechnik KG, 5750 Menden Verfahren zur kuehlung einer charge nach einer waermebehandlung und ofenanlage zur durchfuehrung des verfahrens
DE3405244C1 (de) * 1984-02-15 1985-04-11 Aichelin GmbH, 7015 Korntal-Münchingen Industrieofen,insbesondere Mehrkammer-Vakuumofen zur Waermebehandlung von Chargen metallischer Werkstuecke
DE3736501C1 (de) * 1987-10-28 1988-06-09 Degussa Verfahren zur Waermebehandlung metallischer Werkstuecke
DE3819803C1 (ja) * 1988-06-10 1989-12-14 Ulrich 5810 Witten De Wingens
US4906182A (en) * 1988-08-25 1990-03-06 Abar Ipsen Industries, Inc. Gas cooling system for processing furnace

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DE59307686D1 (de) 1998-01-02
JPH0610037A (ja) 1994-01-18
EP0562250A1 (de) 1993-09-29
DE4208485C2 (de) 1997-09-04
DE4208485C1 (ja) 1993-02-11
US5452882A (en) 1995-09-26
ATE160382T1 (de) 1997-12-15

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