TW201437379A - Cooling hood for the slow cooling of incandescent material - Google Patents

Abstract

Cooling cover (200) for a bell annealer furnace (100) for cooling the previously in a heating mantle (110) heated annealing material (102) is arranged for heating and cooling within a protective hood (104) of the bell annealer furnace (100), wherein the cooling cover (200) comprises a cooling cover body (202) to be placed over the protective hood (104) which at least partially made of a thermally insulating material (204), a cooling gas entrance opening (206) in the cooling cover body (202) for letting in the cooling gas into a space between the protective cover (104) and the cooling cover body (202) for heat exchange of the cooling gas with the material to be annealed (102) through the protective cover (104), a cooling gas exit opening (208) in the cooling cover body (202) for removing the cooling gas after the heat exchange process, a closing device (210) is adapted to selectively close the cooling gas exit opening (208), and comprising a ventilation means (212) for ventilating the cooling gas between the cooling gas entrance opening (206) and the cooling gas exit opening (208).

Description

Cooling cover for slowly cooling the heat-treated workpiece

The present invention relates to a cooling hood for a bell annealer, a hood annealing furnace for heat treating annealed workpieces, and a method for heat treating annealed workpieces in a hood annealing furnace.

A method is disclosed in the patent document AT 508 776 for heating annealed workpieces for annealing treatment in a hood annealing apparatus placed on a receiving base. The annealed workpiece can be heated by a heating mantle. The heated annealed workpiece can be cooled by a cooling hood.
In the prior art, a hood annealing furnace cools the annealed workpiece as quickly as possible with the cooling hood and the fan after the end of the heating process. However, there are also some annealing processes in which the cooling is very slow at the beginning. In the prior art, such a low cooling gradient is to be achieved in the heating hood to cool the burner with cooling air. However, this means extending the occupation of expensive heating covers.
Conventional working annealing furnaces also fail to achieve slow cooling of the annealed workpiece without the use of expensive heating covers.
The slow cooling of the annealed workpiece achieved by a simple method is an object of the present invention.

This task can be achieved based on the feature points in the individual items in the scope of the patent application. Several embodiments are described in each of the dependent claims.
According to an embodiment of the present invention, a cooling hood is disposed on a hood annealing furnace, so that the annealed workpiece previously heated in the heating hood can be cooled therein, and the annealed workpiece is placed in the hood A protective cover in the annealing furnace is heated and cooled, wherein the cooling cover comprises a cooling cover for covering the outside of the protective cover, and the cooling cover is at least partially made of a heat insulating material a cooling gas inlet disposed on the cooling cover for supplying cooling gas into the compartment between the protective cover and the cooling cover, so that the protective cover can be used to exchange heat with the annealed workpiece; a cooling gas outlet on the cover for discharging the cooling gas after the heat exchange; a closing device designed to selectively close or at least partially (particularly progressively) open the cooling gas outlet; a ventilating device for agitating a cooling gas between the cooling gas inlet and the cooling gas outlet (particularly for cooling gas inside the cooling hood) The cooling gas is discharged through the outlet).
According to another exemplary embodiment of the present invention, there is provided a bell annealing furnace for heating annealed workpiece and subsequently cooling the annealed workpiece, wherein the bell annealer comprises: a protective cover for receiving the annealed workpiece (in the protective cover) and for heating and subsequently cooling the annealed workpiece, that is, filling a heat exchange gas (or shielding gas) in the protective cover to facilitate the annealing of the workpiece, especially in a circulating manner, Heat exchange; a heating cover is disposed outside the protective cover for heating the annealed workpiece, wherein the heating cover is designed to heat the gas in the chamber between the protective cover and the heating cover, The annealing workpiece is heated by means of the protective cover; and a cooling cover having the above features disposed outside the protective cover in place of the heating cover to cool the annealed workpiece previously heated by the heating cover.
According to another exemplary embodiment of the present invention, it is disclosed that an annealing workpiece for use in a protective cover that is previously heated in a hood furnace and disposed in a protective hood is used with a cooling hood a method of cooling: placing a cooling cover of a cooling cover outside the protective cover, and at least partially made of a thermally insulating material; introducing cooling gas into the middle between the protective cover and the cooling cover In the space, the cooling gas and the annealed workpiece utilize the protective cover to generate heat exchange, wherein the cooling gas system enters through a cooling gas inlet on the cover; the introduced cooling gas is cooled by heat exchange a cooling gas outlet on the cooling jacket of the cover, the cooling cover being provided with a closing device for selectively closing or at least partially opening the cooling gas outlet; and a cooling gas inlet and the cooling gas to be located The cooling gas between the outlets is ventilated by means of a ventilation device of the cooling hood.
According to an exemplary embodiment, the present invention provides a cooling hood that is thermally insulated from the surroundings as compared to prior art cooling hoods. This is contrary to the principle of the operation of the conventional cooling hood, that is, in order to accelerate the cooling of the annealed workpiece, it is necessary to form a good heat dissipation into the surrounding environment, and thus it is necessary to form a heat-weak coupling environment, especially when the surrounding gas is air. . The method is to provide a closing device attached to the cooling cover for selectively and progressively closing a cooling gas outlet, so that a relatively weak heat exchange between the intake air passing through the cooling gas inlet and the protective cover is caused. The practice is to properly control the closure device, preferably by controlling the extent to which the cooling gas outlet is opened for continuous adjustment. This will also help to discharge a small amount of heat from the interior of the boot from the annealed workpiece to the surrounding environment. By the opening degree of the closing device, the effective size of the cooling gas outlet can be adjusted to adjust the heat dissipation intensity of the annealed workpiece to the surrounding environment. By this joint action: that is, on the one hand, at least a part of the cooling hood is made of a heat insulating material; on the other hand, by forming a cooling gas flow between the cooling gas inlet and the cooling gas outlet is weaker than Slow, adjustable heat transfer; thus, a slower, more controllable cooling gradient can be specified so that the annealed workpiece can be heat treated in a reproducible cooling process.
One embodiment of the present invention is based on the design of a special cooling hood (for example, a single-sided opening and a hollow cylinder to facilitate upward flow of cooling air, for example, using three fans to carry the cooling air along the top The bottom of the protective cover is sucked out. The cylindrical body has measures for insulation, and a single or a plurality of fans are equipped with an opening and closing baffle. This allows the annealed workpiece to achieve even very small cooling gradients. Due to the radiation from the protective cover, the degree of cooling may be too high without insulation. Without the opening and closing of the baffle, the natural convection between the protective cover and the cooling shroud will be too large, so that the cooling of the material will be too strong. It is also possible to influence the size of the cooling gradient by changing the fan speed of the cooling fan. To interrupt or purposefully weaken the natural exhaust effect, an alternative is to at least partially close the lower air intake by utilizing another baffle, (or another controllable closing device) .

In addition, related exemplary embodiments such as a cooling hood, a hood annealing furnace, and a method will be further explained.
In one embodiment, the cooling jacket may have an outer stability sheath, in particular made of a metallic material, such as steel, wherein at least a portion of its inner side is covered with a heat insulating material, in particular a mineral fiber. Or organic fiber. However, there is another configuration in which the cooling jacket has an inner stability sheath, in particular made of a metallic material, such as steel, wherein at least a portion of the outer side thereof is covered with a heat insulating material, Especially mineral or organic fibers. Finally, the insulating material can also be integrated or embedded in such a stability sheath, that is, it is disposed inside the stability sheath. Thereby the thermal insulation of the cooling hood can be attached to the inside and/or outside of the support stabilizing sheath (eg, a metal can) of the housing.
According to one embodiment, the cooling gas inlet may be provided at an open end of a cooling jacket (ie at a mounting end), the cooling gas inlet being mounted on a base (especially an annealing base) In this case, the bottom end of the bell-type annealing furnace body, that is, the bottom end of the cooling cover body on the base side is formed. Therefore, it is possible to inject a gas from the storage tank or the atmosphere under control into the cooling hood near the base of the bell annealer, wherein a gas stream of a continuously heated gas similar to the gas flow in a chimney is produced, It can be advantageously utilized along the cooling hood.
According to one embodiment, the cooling gas inlet can be designed as a trough to draw air into the surrounding environment (i.e., under normal conditions in a laboratory environment, i.e., a pressure of 1 bar ± 100 mbar and a temperature of 20 ° C ± 20 °C). One such trough design can therefore be used to draw in air. In this way, there is no need to install the suction mechanism at one end of the trough design, because the cooling fan or the like provided at the other end of the cooling cover has a ventilation effect and sufficient air flow to make the cooling gas. The inlet draws in air from the environment. The chimney effect inside the cooling hood also promotes this flow.
According to one embodiment, the closure device can be designed as a baffle (ie, for example, a baffle that can be pivoted about a shaft) that relatively closes the cooling gas inlet, Fully open or only partially open (especially in different degrees that can be set to open). Such a pivotable baffle allows the intensity of the cooling gas flow to be set by adjusting its degree of inclination or inclination to specifically affect the cooling rate of the annealed workpiece.
According to one embodiment, the closing mechanism can be designed to gradually close a predetermined portion of the cooling gas inlet (or can gradually open a remaining portion). According to this embodiment, the closure device can not only fully open or completely close the cooling gas outlet. More importantly, between the fully closed state and the fully open state, each state between them can be continuously adjusted to control the release of the annealed workpiece with more or less heat depending on the intensity of the cooling gas flow. .
In one embodiment, the venting means is mountable on the outer wall of the cooling hood. The closure device can then be mounted to an outer wall of the venting device. Since the venting device is mounted external to the cooling hood, it can be kept undisturbed by thermal equilibrium within the cooling hood.
According to an embodiment, the cooling gas outlet may be designed to discharge the cooling gas into the atmosphere surrounding the cooling hood when the closing device is at least partially open, ie in an atmosphere of comparable laboratory conditions . This leads to a small and simple structure.
According to one embodiment, the cooling gas outlet is disposed at an originally closed end of the cooling jacket (particularly near the top surface of the cup-shaped cooling jacket) when the cooling jacket is mounted in a hood annealing furnace In the case of the base, it forms an upper end of the cooling jacket (i.e., an end remote from the base). Since the cooling gas outlet and the venting means are both disposed at the upper end of the cooling hood, they can be discharged without difficulty by the air passing through the cooling gas outlet from the bottom up by a chimney effect.
In one embodiment, the cooling hood can be provided with more, in particular 3, closing devices and, more, in particular 3, ventilation devices, wherein each ventilation device is provided with a closing device for These ventilation devices can be controlled to be fully or partially open or fully closed. The advantage of exactly three fans is that it can evenly dissipate heat in the circumferential direction of the cooling hood at a reasonable equipment cost to cool the annealed workpiece. But it can also be two, four, five or more ventilation devices. It may also be that a single ventilation unit may be sufficient.
According to an embodiment, the cooling hood can have a cooling program setting mechanism for controlling (in particular according to a fixed predetermined control scheme) or regulating (in particular automatically based on the measured sensor signal, for example a measurement signal indication The annealed workpiece actual temperature - to adjust the cooling rate of the annealed workpiece) the intensity of the cooling gas flow between the cooling gas inlet and the cooling gas outlet to adjust the cooling of the annealed workpiece in accordance with a predetermined cooling procedure. Such a cooling program setting mechanism may be a processor (for example, a microprocessor or a CPU, a central processing unit), which may, for example, adjust the cooling gradient or a set cooling rate according to a set. Cooling airflow through the cooling hood. In the case of automatic control, the control signal of the sensor disposed within the protective cover can be used to adjust the flow of the cooling airflow based on the actual temperature change of the cooled annealed workpiece. Based on the currently detected cooling rate, whether it is too high or too low to reduce or increase the flow rate of the cooling airflow compared to a set cooling curve.
According to an embodiment, the cooling program setting mechanism may be configured such that a preset cooling process of the annealed workpiece is achieved by adjusting the coverage of the cooling gas outlet by the closing mechanism (ie, adjusting the cooling gas outlet by the closing mechanism) Coverage, thereby adjusting the opening of the cooling gas outlet), and/or by adjusting the ventilation intensity of the ventilation device (eg, by adjusting the rotational speed of the fan), and/or by adjusting the flow of cooling gas by another closure device The coverage of the inlet (including the closure of the cooling gas inlet may also be provided with another closure, for example, also a pivotable baffle, which may also be fully or partially opened or closed).
According to one embodiment, the cooling program setting mechanism can be configured to adjust the cooling process of the annealed workpiece to a cooling rate of less than about 50 K/hour (Kelvin per hour), more preferably less than about 15 K / hour. For example, it is in the range of 1 K/h to 15 K/h cooling rate, especially in the range of 5 K/h to 10 K/h. Certain high quality strip steels are required to be treated in this cooling gradient because too rapid cooling creates a tendency to adhere and the edge of the strip. Therefore, even a very low cooling rate can be adjusted compared to a conventional annealed workpiece cooling device without the need for time-consuming and expensive heating covers for cooling.
According to an embodiment, the insulating material has a thermal conductivity of no more than 3 watts/meter ∙K, in particular no more than 0.5 watts/meter ∙K, and more particularly no more than 0.1 watts/meter ∙K. Usable insulating materials are vacuum insulation panels, aerogels, mineral wool, polyurethane, polystyrene, polyethylene foam, wool, cork, cellulose, wood fiber insulation boards, perlite, etc. (eine Vakuumdammplatte, ein Aerogel, Mineralwolle, Polyurethan, Polystyrol, Polyethylenschaumstoffe, Wolle, Kork, Cellulose, Holzfaserdammplatten, Perlit, etc.).
In one embodiment, the heating mantle is provided with a heating device, in particular a burner (for example, a gas burner, which can be integrated inside a wall of the heating mantle), which is adapted to heat the The gas is heated to indirectly heat the annealed workpiece. For example, a gas burner can be used to heat the space between the heating cover and the protective cover, and the heating gas therein can be thermally balanced with the inert gas contained in the protective cover through the heat conducting wall of the protective cover, and finally The annealing workpiece there is subjected to a heating process.
According to one embodiment, the bell annealer may be provided with a base on which the annealed workpiece, the boot and alternately mounted cooling or heating covers may be placed. More specifically, to heat-treat the workpiece, it can be mounted on the pedestal first. The protective cover can then be placed on the base and then an inert gas introduced into the interior of the protective cover. It is used to heat annealed workpieces, such as steel strips or wire loops, and then the heating cover can be mounted outside the protective cover. The annealed workpiece can be heated to a very high temperature, such as 900 ° C, by heating the heating gas in the heating mantle through a burner or electric heat. Thereafter, the heating mantle can be removed and replaced by a cooling mantle. The degree of adjustable heat exchange can be achieved by ambient air, or the like, flowing into the interior of the cooling hood in an adjustable amount which can result in slow cooling of the annealed workpiece.

100. . . Hood heat treatment furnace

102. . . Annealed material

104. . . Protective cover

106. . . Wind drum

108. . . Process arrow

110. . . Heating cover

112. . . burner

120. . . Control device

200. . . Cooling hood

202. . . Cooling cover

204. . . Thermal insulation

206. . . Cooling gas inlet

208. . . Cooling gas outlet

210. . . Close the board

212. . . Ventilation device

214. . . Stability shell

216. . . Pedestal

218. . . Cooling program setting mechanism

230. . . Closing device

Several embodiments of the invention are described in detail below with reference to the following drawings.
1 illustrates a bell annealer for heat treating an annealed workpiece in an operational state in accordance with an exemplary embodiment of the present invention, wherein the annealed workpiece is heated using a heating mantle.
2 illustrates another operational state of the bell annealer of FIG. 1 in which the material to be annealed is cooled using a cooling hood according to an exemplary embodiment of the present invention.
FIG. 3 illustrates a side view of a cooling hood in accordance with an exemplary embodiment of the present invention.
Figure 4 shows the top view of the cooling hood of Figure 3. The same or similar components in the above figures are given the same reference numerals.

1 shows an operational state of a bell annealer 100 in accordance with an exemplary embodiment of the present invention, wherein the annealed workpiece 102 is being heated. The annealing pedestal 216 is assigned to a protective cover 104 for sealing the annealed workpiece 102 outwardly. Inside the protective cover 104, there is a wind drum 106 for flowing the shielding gas in the direction of the flow arrow 108. . The outer casing of the annealed base 216 is constructed of a heating mantle 110 that includes, for example, a gas burner 112 for heating the annealed workpiece 102 to a predetermined temperature by applying a protective cover 104 and the hot combustion gases. Heat treatment temperature. The heat exchange takes place in the hot combustion gas, also referred to as hot gas, which transfers heat through the protective cover 104 to the inert gas circulating in the protective cover 104, and further transfers heat from the inert protective gas to it. The surrounding workpiece 102 is annealed.
A control device 120 controls the hot combustion gas to be filled and discharged from the space between the heating hood 110 and the protective cover 104.
In the operational state shown in Figure 1, the annealed workpiece 102 can be brought to a desired temperature, such as 800 ° C, and maintained at that temperature for a predetermined time. After this warming or heating mode, it may be necessary to perform cooling of the annealed workpiece 102. In some cases it may be desirable to cool the cooled annealed workpiece 102 at a very low cooling rate, for example, 5 ° C / hour.
To this end, the bell annealer 100 will be modified as shown in Figure 2 as shown in Figure 2. First, the heating cover 110 is taken out from the bell annealing furnace 100 so that the protective cover 104 is exposed outward. In accordance with an exemplary embodiment of the present invention, a cooling mantle 200 is then mounted on the base 216.
The cooling jacket 202 has a steel stability shell 214 for providing mechanical stability and a mineral wool-lined insulation layer disposed inward (and/or outwardly) relative to the stability shell 214 204. A cooling gas inlet 206 is provided at a lower end of the cooling cover 202 for introducing a cooling gas, for example, introducing ambient air to a space between the protective cover 104 and the cooling cover 202 to facilitate the cooling. The gas is heat exchanged with the annealed workpiece 102 through the protective cover 104. It is also possible to provide a plurality of cooling gas outlets 206.
At the upper end of the cooling hood 200, a plurality of cooling gas outlets 208 are provided in the cooling hood 202 for cooling gas from the cooling gas inlet 206 and having exchanged heat with the annealed workpiece 102 through the protective cover 104. The cooling cover 200 is discharged. Each of the cooling gas outlets 208 is provided with a closing device 210 slidable from side to side, the closing device having to completely open or completely close the associated cooling gas outlet 208, or only partially covering the associated cooling gas. The exit section is open. In addition to providing a closure device 210 that is slidable along a double arrow, a pivotable closure device, or other adjustable opening, can also be provided. For example, the cooling gas outlet 208 may also be provided by a flexible diaphragm (for example, rubber) that can close a slit when subjected to an external force, and is temporarily opened when subjected to pressure, similar to a pressure relief valve. The mouth.
In addition, each of the cooling gas outlets 208 may also be provided with a venting device 212 (or other blast drum) for pumping the cooling gas through the associated cooling gas outlet 208 for discharge. Due to the chimney effect and the pushing of the venting device 212, the cooling gas drawn from the cooling gas inlet 206 is sent to the cooling gas outlet 208.
The operation of the cooling hood 200 is as follows: the annealed workpiece 102 under the protective cover 104 is in a heated state. The shielding gas can be continuously driven by the action of the circulation pump or the wind drum 106. The drum 106 can also be closed during cooling. As the gas flows through the cooling gas inlet 206 into the space between the boot 104 and the cooling shroud 200, its upward flow from the bottom is a result of a chimney effect and is also a result of the additional drive by the fan 212, which also It exits the cooling hood 200 through the cooling gas outlet 208. The cooling gas is in a path along the cooling gas inlet 206 to the cooling gas outlet 208, and the cooling gas is heated by the protective cover 104 in interaction with the inert gas and the annealed workpiece 102, thereby taking away The thermal energy of the annealed workpiece 102. This results in a particularly slow cooling of the annealed workpiece 102 within the boot 104. This is because the inner side (and/or the outer side) of the cooling jacket 202 is lined with a heat insulating material 204, and there is no or no significant heat exchange by the wall away from the cooling shell 202.
Figure 2 also shows a cooling program setting mechanism 218 which, for example, can be a computer processor. The cooling program setting mechanism 218 can also be manipulated by the user with a control command, for example, a user can specify a cooling rate, or a predetermined cooling gradient or cooling program. The cooling program setting mechanism 218 can control or adjust the closure device 210 (eg, the extent to which an opening is set) and/or the venting device 212 (eg, setting a number of revolutions) and/or the possibility to cool the gas inlet 206 There are closure devices 230 (e.g., to the extent that an opening is set). Thereby, the amount of the cooling gas, its flow rate inside the cooling hood 200 and the action time can be set, and a desired, preferably low, cooling rate can be achieved. This is important or advantageous for certain types of annealed workpieces 102.
FIG. 3 shows a side view according to an exemplary embodiment of the present invention, and FIG. 4 shows a plan view of a cooling cover 200. The cooling hood has three fans 212 mounted circumferentially at the upper end of the cooling hood 202, and a pivoting air baffle is provided at the top end of each of the fans as a closing device 210.
Figure 4 also shows that the cooling gas inlet 206 is configured in this example as a tank for drawing ambient air.
It is to be noted that the term "set" is an open-ended word, and a combination of elements, components or steps does not exclude elements, components or steps, etc., which are not recited in the claims, and the use of the singular does not exclude the plural. In addition, it is also to be noted that the features or steps used in the above embodiments may be combined with other features or steps to be applied to the other embodiments above. The symbolic symbols in the scope of the patent application are not limiting.

104. . . Protective cover

200. . . Cooling hood

202. . . Cooling cover

204. . . Thermal insulation

208. . . Cooling gas outlet

210. . . Closing device

212. . . Ventilation device

Claims (18)

[Item 1] A cooling hood (200) for a hood annealing furnace (100) for cooling an annealed workpiece (102) previously heated by a heating hood (110), the annealed workpiece (102) being placed in a hood annealing furnace ( The protective cover (104) of 100) is subjected to heating and cooling treatment, characterized in that the cooling cover (200) comprises at least:
a cooling jacket (202) disposed outside the protective cover (104), at least partially made of a thermally insulating material (204);
A cooling gas inlet (206) is disposed on the cooling cover (202) for allowing cooling gas to enter the gap between the protective cover (104) and the cooling cover (202) to facilitate the cooling gas In the protective cover (104), heat exchange can be generated with the workpiece (102) to be heat treated;
a cooling gas outlet (208) is disposed on the cooling cover (202) for discharging the cooling gas after the heat exchange;
a closing device (210) for selectively closing or at least partially opening the cooling gas outlet (208); a venting device (212) for the cooling gas inlet (206) and the cooling gas outlet (208) The cooling gas between the two reaches the effect of the flow. [Item 2] The cooling hood (200) of claim 1, wherein the cooling hood (202) comprises at least one, in particular, an outer side stability sheath made of a metal material, in particular, and/or An inner stability sheath (214), characterized in that the surface of the stability sheath is at least partially, in particular from the inner side and/or the outer side, covered with, in particular, an insulating material made of mineral or organic fibers Material (204). [Item 3] The cooling hood (200) according to claim 1 or 2, wherein the cooling gas inlet (206) is disposed at an open end of the cooling hood (202), the cooling hood (200) After being mounted on the base of the bell annealer (100), it is placed at the lower end of the cooling jacket (202). [Item 4] The cooling hood (200) according to any one of claims 1 to 3, wherein the cooling gas inlet (206) for sucking ambient air is the cooling hood ( 202) The slot on the top. [Item 5] The cooling hood (200) according to any one of the preceding claims, wherein the closing device (210) is configured as a closing flap for selectively closing Or at least partially, in a folded-up manner, the cooling gas outlet (208) is opened. [Item 6] The cooling hood (200) according to any one of the preceding claims, wherein the closing device (210) is configured to gradually close the cooling gas outlet (208). part. [Item 7] The cooling hood (200) according to any one of the preceding claims, wherein the ventilation device (212) is disposed on an outer wall of the cooling cover (202), The closure device (210) is mounted on an outer wall of the ventilation device (212). [Item 8] The cooling hood (200) according to any one of the preceding claims, wherein the cooling gas outlet (208) is designed to be at least partially opened by the closing device (210). The cooling gas is discharged to the atmosphere surrounding the cooling hood (200). [Item 9] The cooling hood (200) according to any one of claims 1 to 8, wherein the cooling gas outlet (208) is disposed at a normally closed end of the cooling hood (202). After the cooling hood (200) has been mounted on the pedestal (216) of the hood annealing furnace (100), it is placed at the upper end of the cooling hood (202). [Item 10] The cooling hood (200) according to any one of claims 1 to 9, characterized in that it comprises a plurality, in particular three, a closing device (210) and a plurality, in particular 3 And a ventilation device (212), wherein each of the closing devices (210) corresponds to a ventilation device (212). [Item 11] A cooling hood (200) according to any one of claims 1 to 10, characterized in that it comprises a cooling program setting mechanism (218) designed to control the cooling gas inlet (206) The fluid between the cooling gas outlets (208) can be used to preset the cooling process of the annealed workpiece (102). [Item 12] The cooling hood (200) of claim 11, wherein the cooling program setting mechanism (218) is adapted to set the annealing workpiece (102) at a predetermined cooling:
Adjusting the extent to which the cooling gas outlet (208) is closed by the closing device (210), and/or by adjusting the ventilation intensity of the ventilation device (212); and/or setting the adjustment by an additional closing device (210) The degree of closure of the cooling gas inlet (206) is achieved for the purpose of setting. [Item 13] The cooling hood (200) according to claim 11 or 12, wherein the cooling program setting mechanism (218) is to control cooling of the annealing workpiece (102), which is cooled. The rate is below 50 K/hr, in particular less than 15 K/hr. [Item 14] The cooling hood (200) according to any one of the preceding claims, wherein the heat insulating material (204) has a height of not more than 3 watts/meter ∙K, particularly not more than 0.5 watts. / MK K, more specifically, the thermal conductivity of no more than 0.1 W / m ∙ K. [Item 15] A hood annealing furnace (100) is used to heat and then cool annealed workpiece (102), characterized in that the hood annealing furnace (100) comprises at least:
A protective cover (104) for receiving the annealed workpiece (102) for heating and subsequently cooling the annealed workpiece (102), that is, a heat exchange gas filled in the protective cover (104) and the annealed workpiece (102) ), especially cyclic, heat exchange;
A heating cover (110) is disposed outside the protective cover (104) for heating the annealed workpiece (102), wherein the heating cover (110) is designed such that the protective cover (104) can be And a heating gas in a gap between the heating cover (110) for heating the annealed workpiece (102) through the device of the protective cover (104);
A cooling cover (200) disposed on the protective cover (104) in place of the heating cover (110), for cooling the previously utilized heating cover (110) according to any one of claims 1 to 14. The heated annealed workpiece (102). [Item 16] A bell annealing furnace (100) according to claim 15 wherein the heating jacket (110) comprises a heater (112), in particular a burner for heating the heating gas, The annealed workpiece (102) is reheated. [Item 17] The bellows annealing furnace (100) according to claim 15 or 16, characterized in that it comprises a base (216) on which the annealed workpiece (102) can be placed, the protection The cover (104) and the cooling cover (200) or the heating cover (110) are placed in an alternating manner. [Item 18] A method of cooling an annealed workpiece (102) previously heated by a heating mantle (110) using a cooling hood (200) that is placed in a protective cover of a hood annealing furnace (100) (104) receiving heating and cooling treatment, wherein the method comprises at least:
Place a cooling cover (202) of a cooling cover (200) outside the protective cover (104), which is at least partially made of a thermal insulating material (204);
Allowing the cooling gas to enter a cooling gas inlet (206) disposed on the cooling jacket (202) into the gap between the protective cover (104) and the cooling cover (202) to facilitate the cooling gas The protective cover (104) can exchange heat with the annealed workpiece (102) to be heat treated;
After the heat exchange, the cooling gas is discharged through a cooling gas outlet (208) provided on the cooling cover (202);
Providing a closing device (210) on the cooling hood (200) for selectively closing or at least partially opening the cooling gas outlet (208);
The cooling gas is delivered from the cooling gas inlet (206) to the cooling gas outlet (208) via a venting means (212) on a cooling jacket (200).