WO2007055650A1 - An arrangement and a method for heating metal objects - Google Patents
An arrangement and a method for heating metal objects Download PDFInfo
- Publication number
- WO2007055650A1 WO2007055650A1 PCT/SE2006/050454 SE2006050454W WO2007055650A1 WO 2007055650 A1 WO2007055650 A1 WO 2007055650A1 SE 2006050454 W SE2006050454 W SE 2006050454W WO 2007055650 A1 WO2007055650 A1 WO 2007055650A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- conveyor
- chamber
- air
- shell
- heating
- Prior art date
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 75
- 239000002184 metal Substances 0.000 title claims abstract description 43
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000007664 blowing Methods 0.000 claims 1
- 238000005520 cutting process Methods 0.000 description 19
- 229910001220 stainless steel Inorganic materials 0.000 description 8
- 239000010935 stainless steel Substances 0.000 description 8
- 230000006698 induction Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000009931 harmful effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
- F27B9/10—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated heated by hot air or gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/08—Means for treating work or cutting member to facilitate cutting
- B26D7/10—Means for treating work or cutting member to facilitate cutting by heating
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof
-
- 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
- C21D9/0056—Furnaces through which the charge is moved in a horizontal straight path
-
- 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
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
- F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
- F27B9/243—Endless-strand conveyor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/3005—Details, accessories, or equipment peculiar to furnaces of these types arrangements for circulating gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/38—Arrangements of devices for charging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/39—Arrangements of devices for discharging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/40—Arrangements of controlling or monitoring devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/0014—Devices for monitoring temperature
Definitions
- the present invention generally relates to the field of heating metal objects, in particular such objects as elongate metal bars.
- Such an improved arrangement and improved method may advantageously be used for the purpose of heating metal objects that will subsequently be cut into smaller pieces.
- the invention relates to an arrangement for heating metal objects.
- the inventive arrangement comprises a shell that envelops an inner space.
- the shell has an entry opening and an exit opening.
- Inside the shell inner walls divide the inner space into a rear chamber, at least one intermediate chamber and a forward chamber.
- a permeable conveyor extends from the entry opening of the shell to the exit opening of the shell through the rear, intermediate and forward chamber. In this way, objects loaded on the conveyor can be transported through the chambers.
- a fan is arranged to direct a flow of gas towards the conveyor and objects placed on the conveyor.
- a heating element is also arranged in the intermediate chamber. The heating element may heat a gas flowing from the fan before the gas reaches the conveyor.
- the chambers are connected to each other in such a way that at least one outlet of the at least one intermediate chamber communicates with the rear chamber, at least one outlet of the intermediate chamber communicates with the forward chamber and at least one inlet of the intermediate chamber communicates with outlets of the rear and forward chambers.
- operation of the fan will generate a rear circulation of gas passing twice through the conveyor and a forward circulation of gas also passing twice through the conveyor.
- a temperature sensor is located inside the shell and connected to a control device that controls the temperature of the heating element as a function of a nominal value and a valued indicated by the temperature sensor.
- the temperature sensor may be placed in the forward chamber between the conveyor and outlet of the forward chamber.
- the arrangement comprises a plurality of fans and a plurality of heating elements arranged in rows extending perpendicularly to the direction of movement of the conveyor.
- the heating arrangement may be followed by a cutting device that cuts metal objects that have been heated by the heating arrangement.
- the invention also relates to a method for heating metal objects.
- the method comprises passing the metal objects on a permeable conveyor through an inner space enclosed by a shell and divided by inner walls into a rear chamber, at least one intermediate chamber and a forward chamber.
- air is heated and the heated air is blown through the conveyor.
- a first part of the heated air that has passed through the conveyor in the at least one intermediate chamber is diverted into a rear circulation of air.
- the rear circulation of air is passed through the conveyor in the rear chamber and back to the at least one intermediate chamber.
- a second part of the heated air that has passed through the at least one intermediate chamber is diverted into a forward circulation of air.
- the forward circulation of air passes through the conveyor in the forward chamber and back to the at least one intermediate chamber.
- the temperature of the air is measured inside the shell and the heating of air is controlled as a function of a nominal value and the measured value.
- a suitable nominal value for the temperature may be 7O 0 C. If the temperature is measured, this may be done in the forward chamber at such a location that the temperature of the air is measured after it has passed through the conveyor in the forward chamber.
- the air is heated by a heater located inside the at least one intermediate chamber and the temperature of the heater is kept in the range of 200 0 C - 300 0 C.
- the metal objects are elongate metal bars.
- the heating operation may advantageously be followed by a subsequent operation such as cutting of metal bars.
- the heating operation itself can then be regarded as a part of a method for heating and cutting metal bars.
- Fig. 1 is a schematic cross sectional view of a heating arrangement according to the present invention.
- Fig. 2 is a cross- sectional view along the line H-II in Fig. 1.
- Fig. 3 is a schematic representation of a cutting device.
- Fig. 4 illustrates the operation of the cutting device shown in Fig. 3.
- Fig. 5 is a schematic cross sectional view of a heating arrangement according to an alternative embodiment.
- the invention relates to an arrangement 1 for heating metal objects 19, in particular as a preliminary operation that precedes a subsequent cutting operation.
- metal objects such as elongate bars 19 are placed in a storage 20.
- the metal objects 19 can be loaded on a conveyor 17 and transported through the heating arrangement 1.
- the storage 20 may be provided with one or several flexible elements 37 on which the metal objects rest in the storage 20. If the flexible element 37 is shortened, the bars 19 are lifted and gravity will cause the bars 19 to fall on the conveyor 17.
- the flexible element 37 may be, for example, one or several belts 37 that can be made shorter by winding an end of the belt 37 on a reel (not shown).
- the conveyor 17 is provided with teeth 18 that makes transfer to the conveyor more reliable and also keeps the bars 19 spaced from each other on the conveyor 17.
- the heating arrangement 1 comprises a shell 2 that envelops an inner space 3.
- the shell 2 has an entry opening 4 and an exit opening 5.
- inner walls 6, 7 divide the inner space 3 into a rear chamber 8, at least one intermediate chamber 9 and a forward chamber 10.
- the conveyor 17 is permeable to air and extends from the entry opening 4 of the shell 2 to the exit opening 5 of the shell 2 through the rear 8 intermediate 9 and forward chamber 10. In this way, objects 19 loaded on the conveyor 17 can be transported through the chambers 8, 9, 10 from the entry opening 4 to the exit opening 5.
- the conveyor extends beyond the shell 2 on both sides of the shell 2.
- the conveyor 17 may be followed by a cutting device 31 that is symbolically indicated in Fig.l. After a metal object such as an elongate bar 19 has been heated in the heating arrangement 1, it is somewhat softer and can more easily be cut into smaller pieces by the cutting device 31.
- a fan 21 is arranged to direct a flow of air (or possibly another gas) towards the conveyor 17 and objects 19 placed on the conveyor 17.
- a heating element 22 in the intermediate chamber 9 is arranged to heat air flowing from the fan 21 before the air reaches the conveyor 17.
- the fan 21 is driven by a motor M which may be an electric motor M.
- the electric motor M is preferably located inside the intermediate chamber 9 together with the fan 21.
- the chambers 8, 9, 10 are connected to each other in such a way that at least one outlet 14 of the at least one intermediate chamber 9 communicates with the rear chamber 8, 10. At least one outlet 14 of the intermediate chamber 9 communicates with the forward chamber 10 and at least one inlet 13 of the intermediate chamber 9 communicates with outlets 12, 16 of the rear and forward chambers 8, 10. In this way, operation of the fan 21 will generate a rear circulation of air passing twice through the conveyor 17 and a forward circulation of air also passing twice through the conveyor 17. As indicated in Fig. 1, a separating wall 23 may be located at the outlet 14 of the intermediate chamber 9. The separating wall 23 serves to separate the airflow from the intermediate chamber 9 into a forward circulation of air and a rear circulation of air.
- a temperature sensor 25 is located inside the shell 2 and connected to a control device 26 that controls the temperature of the heating element 22 as a function of a nominal value and a valued indicated by the temperature sensor 25.
- the temperature sensor 25 is preferably placed in the forward chamber 10 between the conveyor 17 and outlet 16 of the forward chamber 10 but it could also be located on other places, for example in the intermediate chamber.
- the heating element 22 may be, for example, an electric coil.
- embodiments of the inventive arrangement may comprise a plurality of fans 21 and a plurality of heating elements 22 arranged in rows extending perpendicularly to the direction of movement of the conveyor 17.
- the arrangement could comprise 12 fans 21 and 12 heating elements 22.
- Each heating element 22 may be dimensioned for about 3500 W in a realistic embodiment. With 12 heating elements, the entire heating arrangement would then be capable of 42 kW.
- the operation of the inventive arrangement is as follows. Metal objects 19 are passed on the permeable conveyor 17 through the inner space 3 enclosed by the shell 2 and through the chambers 8, 9, 10 of the inner space. In Fig. 1, the metal objects 19 move through the inner space 3 from left to right in the direction of arrow A. Air is blown by the fan 21 towards the permeable conveyor 17 and through the conveyor 17 as the conveyor 17 passes through the intermediate chamber 10. Before the air reaches the conveyor 17, the air is heated by a heating element 22 which may be an electrical heating element 22. When the heated air passes through the conveyor 17, the metal objects 19 are heated by the air.
- the permeable conveyor 17 and the objects 19 loaded on the conveyor act as a throttle that forces the air to increase its velocity as it passes through the conveyor 17.
- the increased velocity of the air improves the heat transfer to the metal objects 19.
- the speed of the air may be about 8 - 10 m/s when the hot air passes through the conveyor 17.
- air flow can be relatively slow which reduces losses due to friction.
- the velocity of the air may be about 4 m/s in a realistic embodiment of the invention.
- a first part of the heated air is diverted into a rear circulation of air RA that is passed to the rear chamber 8, through the conveyor 17 in the rear chamber 8 and back to the at least one intermediate chamber 9.
- a second part of the heated air that has passed through the conveyor 17 in the intermediate chamber 9 is diverted into a forward circulation of air FA that is passed to the forward chamber 10 and through the conveyor 17 as the conveyor 17 passes through the forward chamber 10.
- the air in the forward circulation of air FA is then sent back to the intermediate chamber 9.
- the motor M of the fan 21 be located inside the shell 2 of the arrangement. Locating the motor M outside the shell 2 would result in a more complicated design. If the motor M is an electric motor, is must realistically be expected that the motor will fail or collapse if the ambient temperature becomes to high. For currently available electric motors that the inventors are aware of, ambient temperature should preferably not exceed 70 0 C. In a preferred embodiment of the invention, the temperature of the air is measured inside the shell 2 and the heating of air is controlled as a function of a nominal value and the measured value. In the embodiment illustrated in Fig.
- a temperature sensor 25 is located in the forward chamber 10 adjacent the conveyor 17 such that the temperature of the air is measured after it has passed through the conveyor 17 for the last time before it reaches the fan 21 once more. While the temperature sensor 25 could be located elsewhere, this particular location is considered suitable because the temperature of the air will not change much from this point until it reaches the fan 21 again. Other suitable locations for the sensor 25 could be further downstream in the forward circulation FA, i.e. closer to the fan 21. The position of the sensor 25 could thus be anywhere in the forward chamber 10 between the conveyor 17 and the outlet 16 of the forward chamber. The sensor 25 could also be located in the intermediate chamber upstream of the fan 21 and its motor M. As indicated in Fig.
- the temperature sensor 25 may be connected by a cable 28 to a control device 26 such as for example a thyristor.
- the thyristor 26 may be connected by a cable 30 to a further control device 27, for example a computer 27.
- the thyristor 26 may also be connected by a cable 29 to the heating element 22.
- the computer 27 gives a nominal value for the temperature to the thyristor 27 while the actual value for the temperature is given by the sensor 25 through the cable 28.
- the thyristor can then control the output of the heating element(s) 22 to increase or decrease the output.
- the temperature measured by the temperature sensor 25 should preferably not be allowed to exceed 7O 0 C.
- the nominal value given by the computer 27 is 70 0 C.
- the temperature measured by the temperature sensor 25 could be allowed to be correspondingly higher.
- cables or wires 28, 29, 30 connect the thyristor 26 to the heating element, the temperature sensor 25 and the computer 27.
- the thyristor 26 could also have a wireless communication with these elements.
- the temperature of the coil or coils 22 could be kept in the range of 22 is kept in the range of 200 0 C - 300 0 C such that the air that reaches the conveyor in the intermediate chamber 9 has a temperature which is also in the range of 200 0 C - 300 0 C.
- the life expectancy of electric coils is highly dependent on the temperature to which the coils are heated. For such coils that are currently commercially available, the life expectancy of the coils is almost unlimited if the temperature does not exceed 300 0 C.
- the temperature of the air will be much lower after the air has passed twice through the conveyor 17 and a part of the heat in the air has been transferred to the metal objects 19.
- the metal objects to be heated could normally be heated to temperatures well over 300 0 C without harmful effects to the metal objects themselves.
- the temperatures employed are instead limited by the motor M or the desired life expectancy of the coils 22.
- the heating arrangement 1 may be followed by a cutting device 31.
- the cutting device may comprise a fixed tool 32 and a movable tool 33.
- a channel 34 extends through the fixed tool 32 and the movable tool 33.
- a punch 35 is arranged to strike the movable tool 33.
- a dampening element 36 may be included to receive the impact from a cutting stroke and return the movable tool 33 to its original position.
- To cut a metal bar 19, the bar is inserted into the channel 34 such that it extends through the fixed tool 32 and into the movable tool 33.
- the punch 35 strikes the movable tool 33 as indicated in Fig. 4 and the bar 19 is cut.
- a suitable cutting device 31 could take many other forms. If the bars have been heated before the cutting operation, the cutting will be easier and the surface at the actual cut can be smoother and more even.
- the heating arrangement and method could be used to heat stainless steel bars having a length of about 5,5 m and a diameter of 16 - 25 mm. With currently available cutting devices, such bars can subsequently be cut into 180 pieces in a period of about 50 seconds. This means that new bars must be continuously and rapidly supplied.
- the inventors have found that the use of heated air entails an advantage compared to the use of heating by induction.
- objects such as elongate metal bars 19 are heated, it may be difficult to achieve an even heating of the bars when inductive heating is used.
- the surface of the bars may become heated to a temperature that is harmful while inner parts of the bar are still to cold to allow the bar to be cut as easily as one would desire.
- objects with a bright surface are more difficult to heat by induction. Objects with a bright surface could include objects of stainless steel. Stainless steel bars have a poor thermal conductivity which makes it more difficult to heat such objects.
- heating metal objects such as stainless steel bars by convection is more efficient than heating the metal objects by induction.
- a practical way of heating by convection is to pass the bars through a flow of heated air.
- one realistic embodiment of the invention may comprise 12 fans and 12 heating coils where each heating coil has a capacity of 3,5 kW such that the entire heating arrangement is capable of 42 kW.
- the required effect would be about 100 kW.
- the induction heating could cause harm to the surface of the stainless steel bars.
- the metal objects heated by the hot air may have very different starting temperatures. Bars to be cut may often be stored outdoors and may be taken from an outdoor storage directly to cutting. Depending on the season and the climate, the temperature of the bars may well vary from less than -3O 0 C to above +3O 0 C. This means that the requirements on the heating operation can vary a lot. Moreover, the size of the objects, for example the diameter of stainless steel bars, also influence the amount of heating that is needed. In order to control the temperature of the bars to be cut, it is desirable that the amount of heating can be controlled. The use of the temperature sensor and control equipment such as the thyristor makes it possible to control the temperature to which the bars are heated. This ensures that, when the bars reach the cutting device, the bars will always have the same temperature. In addition, the motor M of the fan can be protected from heat and it is easier to ensure a high life expectancy for the coils 22.
- the division of the heating device into three separate chambers 8, 9, 10 is a very advantageous design for the following reason.
- the throttle formed by the conveyor 17 in combination with the suction effect that the fan 21 generates in the rear chamber 8 and the forward chamber 10 will have the effect that there will be an underpressure in the rear and forward chambers. This counteracts leakage of heated of heated air to the environment. Consequently, this has the advantage that less energy will be required for operation of the process.
- the distance from the entry opening 4 to the exit opening 5 may be about 700 - 1000 mm which allows about 14 - 20 bars to be inside the heating arrangement 1 at the same time.
- the temperature control system described above could be used also for a heating arrangement which is not divided into three separate chambers. It should also be understood that the idea of using three separate chambers can be used independently of whether temperature is measured and controlled or not. However, the temperature control is preferably combined with the principle of using three separate chambers.
- FIG. 5 the rear chamber 8 according to the embodiment of Fig. 1 has been completely eliminated and the entry opening 4 leads directly into the chamber 9 where the fan(s) 21 and the heating element(s) 22 is/are located. In this embodiment, there is no intermediate chamber but only an entry chamber 9 and an exit chamber 10.
- the embodiment of Fig. 5 functions in substantially the same way as the embodiment of Fig. 1. Since the heater(s) 22 and the fan(s) 21 is/are located in the first chamber 9 that borders the outside of the shell 2, it can be expected that losses of heat through the entry opening 4 will be larger than in the embodiment according to Fig. 1. Consequently, the embodiment of Fig. 5 is believed by the inventors to be less advantageous than the embodiment of Fig. 1. However, leakage of hot air to the ambient atmosphere will still be reduced to some extent since there will still be an underpressure in the second chamber 10 which counteracts leakage of hot air through the exit opening 5.
- the invention can be described in a more general way as relating to an arrangement and a method where air is heated in one chamber 9 and blown by a fan or fans 21 through a permeable conveyor 17 and at least a part of the air flow is diverted to at least one additional chamber 8, 10 and passed back in a loop to the chamber 9 in which the air has first been heated.
- this could even include embodiments with two chambers where heating takes place in the second chamber 10, even if such an embodiment is believed by the inventors to being less advantageous compared to the embodiments of Fig. 1 and Fig. 5.
- inventive method may include any method step that would be the natural consequence of operating the inventive arrangement, regardless of whether such steps have been explicitly mentioned or not.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Optics & Photonics (AREA)
- Combustion & Propulsion (AREA)
- Tunnel Furnaces (AREA)
- Furnace Details (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Articles (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2006800470551A CN101331009B (en) | 2005-11-08 | 2006-11-06 | An arrangement and a method for heating metal objects |
JP2008538848A JP2009515129A (en) | 2005-11-08 | 2006-11-06 | Apparatus and method for heating a metal object |
US12/092,759 US20080237943A1 (en) | 2005-11-08 | 2006-11-06 | Arrangement and a Method For Heating Metal Objects |
BRPI0618637-8A BRPI0618637A2 (en) | 2005-11-08 | 2006-11-06 | arrangement and method for heating metal objects |
CA002626938A CA2626938A1 (en) | 2005-11-08 | 2006-11-06 | An arrangement and a method for heating metal objects |
AU2006312319A AU2006312319A1 (en) | 2005-11-08 | 2006-11-06 | An arrangement and a method for heating metal objects |
EP06813074A EP1945420A4 (en) | 2005-11-08 | 2006-11-06 | An arrangement and a method for heating metal objects |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0502474-0 | 2005-11-08 | ||
SE0502474A SE530124C2 (en) | 2005-11-08 | 2005-11-08 | Arrangement and method of heating metal objects |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007055650A1 true WO2007055650A1 (en) | 2007-05-18 |
Family
ID=38023532
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2006/050454 WO2007055650A1 (en) | 2005-11-08 | 2006-11-06 | An arrangement and a method for heating metal objects |
Country Status (11)
Country | Link |
---|---|
US (1) | US20080237943A1 (en) |
EP (1) | EP1945420A4 (en) |
JP (1) | JP2009515129A (en) |
KR (1) | KR20080080294A (en) |
CN (1) | CN101331009B (en) |
AU (1) | AU2006312319A1 (en) |
BR (1) | BRPI0618637A2 (en) |
CA (1) | CA2626938A1 (en) |
SE (1) | SE530124C2 (en) |
WO (1) | WO2007055650A1 (en) |
ZA (1) | ZA200803710B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130313763A1 (en) * | 2012-05-25 | 2013-11-28 | Benteler Automobiltechnik Gmbh | Furnace and method of operating the furnace |
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US8783953B2 (en) * | 2011-07-21 | 2014-07-22 | Roller Bearing Company Of America, Inc. | Low friction seal for bearings |
CN102897533B (en) * | 2012-10-23 | 2014-11-12 | 昆山特力伯传动科技有限公司 | Conveyor belt heating method |
CN105710130B (en) * | 2016-03-30 | 2018-01-30 | 宁波大学 | A kind of floating pressure device of cross wedge rolling rolled piece |
CN105728292A (en) * | 2016-04-19 | 2016-07-06 | 儒玛实业(上海)有限公司 | Electric heating device |
CN107502724A (en) * | 2017-07-06 | 2017-12-22 | 江苏永昊高强度螺栓有限公司 | Bolt heat treatment system and method |
US20190017745A1 (en) * | 2017-07-11 | 2019-01-17 | Air Products And Chemicals, Inc. | Systems and Methods for Preheating Metal-Containing Pellets |
JP2020041737A (en) * | 2018-09-10 | 2020-03-19 | 光洋サーモシステム株式会社 | Heat treatment device |
CN108982201B (en) * | 2018-10-16 | 2024-08-02 | 无锡科智达科技有限公司 | Air bath temperature control device and system |
TWI696704B (en) * | 2019-03-19 | 2020-06-21 | 輯興熱處理工業股份有限公司 | Colorizing method and device |
TWI716899B (en) * | 2019-03-19 | 2021-01-21 | 輯興熱處理工業股份有限公司 | Colorizing method |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4343209A (en) * | 1980-08-12 | 1982-08-10 | Advanced Machine Design Company | Zone heating and shearing system, and method |
US4537102A (en) * | 1983-02-03 | 1985-08-27 | Park-Ohio Industries, Inc. | Method of shearing metal billets |
US5224638A (en) * | 1990-08-20 | 1993-07-06 | Alpha Industries, Inc. | Induction severing apparatus |
US5402663A (en) * | 1991-10-22 | 1995-04-04 | Ascometal | Facility for hot forging workpieces starting from bars |
US5415381A (en) * | 1989-11-24 | 1995-05-16 | Elind, S.P.A. | Steel bar and billet heating system located upstream of shears for further processing |
US6620354B1 (en) * | 1999-11-29 | 2003-09-16 | The Conair Group, Inc. | Apparatus and method for producing and cutting extruded material using temperature feedback |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2296806A (en) * | 1940-05-28 | 1942-09-22 | Salem Engineering Company | Apparatus for heating metal objects |
DE10046957A1 (en) * | 2000-09-21 | 2002-04-11 | Basf Ag | Process for producing a multimetal oxide catalyst, process for producing unsaturated aldehydes and / or carboxylic acids and band calciner |
CN100469719C (en) * | 2001-07-11 | 2009-03-18 | 弗拉奇塔斯有限公司 | Method for conducting heat to a glass sheet |
CN1296784C (en) * | 2004-05-10 | 2007-01-24 | 浙江大学 | Automated control experimental apparatus for micro simulated tunnel kiln |
-
2005
- 2005-11-08 SE SE0502474A patent/SE530124C2/en not_active IP Right Cessation
-
2006
- 2006-11-06 CA CA002626938A patent/CA2626938A1/en not_active Abandoned
- 2006-11-06 BR BRPI0618637-8A patent/BRPI0618637A2/en not_active IP Right Cessation
- 2006-11-06 EP EP06813074A patent/EP1945420A4/en not_active Withdrawn
- 2006-11-06 JP JP2008538848A patent/JP2009515129A/en active Pending
- 2006-11-06 CN CN2006800470551A patent/CN101331009B/en not_active Expired - Fee Related
- 2006-11-06 ZA ZA200803710A patent/ZA200803710B/en unknown
- 2006-11-06 WO PCT/SE2006/050454 patent/WO2007055650A1/en active Application Filing
- 2006-11-06 AU AU2006312319A patent/AU2006312319A1/en not_active Abandoned
- 2006-11-06 KR KR1020087013172A patent/KR20080080294A/en not_active Application Discontinuation
- 2006-11-06 US US12/092,759 patent/US20080237943A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4343209A (en) * | 1980-08-12 | 1982-08-10 | Advanced Machine Design Company | Zone heating and shearing system, and method |
US4537102A (en) * | 1983-02-03 | 1985-08-27 | Park-Ohio Industries, Inc. | Method of shearing metal billets |
US5415381A (en) * | 1989-11-24 | 1995-05-16 | Elind, S.P.A. | Steel bar and billet heating system located upstream of shears for further processing |
US5224638A (en) * | 1990-08-20 | 1993-07-06 | Alpha Industries, Inc. | Induction severing apparatus |
US5402663A (en) * | 1991-10-22 | 1995-04-04 | Ascometal | Facility for hot forging workpieces starting from bars |
US6620354B1 (en) * | 1999-11-29 | 2003-09-16 | The Conair Group, Inc. | Apparatus and method for producing and cutting extruded material using temperature feedback |
Non-Patent Citations (1)
Title |
---|
See also references of EP1945420A4 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130313763A1 (en) * | 2012-05-25 | 2013-11-28 | Benteler Automobiltechnik Gmbh | Furnace and method of operating the furnace |
EP2667132A3 (en) * | 2012-05-25 | 2013-12-18 | Benteler Automobiltechnik GmbH | Kiln assembly and method for operating the kiln assembly |
Also Published As
Publication number | Publication date |
---|---|
SE530124C2 (en) | 2008-03-04 |
SE0502474L (en) | 2007-05-09 |
US20080237943A1 (en) | 2008-10-02 |
BRPI0618637A2 (en) | 2011-09-06 |
EP1945420A4 (en) | 2011-01-05 |
CN101331009A (en) | 2008-12-24 |
CA2626938A1 (en) | 2007-05-18 |
JP2009515129A (en) | 2009-04-09 |
KR20080080294A (en) | 2008-09-03 |
ZA200803710B (en) | 2009-09-30 |
EP1945420A1 (en) | 2008-07-23 |
CN101331009B (en) | 2010-05-19 |
AU2006312319A1 (en) | 2007-05-18 |
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