JP4861846B2 - Continuous annealing equipment - Google Patents

Description

  The present invention relates to a continuous annealing equipment for a metal strip having a continuous annealing furnace and provided with a roll cooling zone and a water quenching processing unit arranged in parallel so that either one can be selected as an annealing path.

  In a continuous annealing facility that performs annealing while transporting a metal band, it is necessary to apply different tensions to the metal band depending on the treatment band. In the technique of Patent Document 1, bridle rolls are provided on the exit side of the heating zone and the exit side of the soaking zone in order to appropriately adjust the tension of the metal strip. The reason for this configuration is that in the heating zone, the metal zone gradually increases in temperature and thermally expands, so if the metal zone tension is low, the metal zone may sag and meander. On the other hand, on the exit side of the heating zone and in the soaking zone, the metal zone becomes hot and softens and the yield point decreases, so if the metal zone tension is too high, the amount of plastic deformation increases. This is because the tension is preferably low because the metal strip extends in the longitudinal direction and contracts in the width direction.

  And by using the technique of patent document 1, in a heating zone, a metal zone tension will be in a high state, and although a metal zone will be extended by thermal expansion, there will be no danger of meandering without producing slack. On the other hand, the metal zone tension is low on the heating zone exit side and the soaking zone, and no significant plastic deformation is caused even though the yield point of the metal zone is lowered. In this way, the tension of the metal band is adjusted appropriately.

Japanese Patent Publication No. 60-7893

  By the way, in the roll cooling process and the water quenching process, since the configuration having the heating zone, the soaking zone, etc. is common, by sharing these common processing zones, the roll cooling and water quenching can be performed with one continuous annealing facility. It is conceivable to perform both insertion processing.

  In this case, specifically, the continuous annealing equipment includes a heating zone, a soaking zone, a gas jet zone, a cooling processing unit (roll cooling zone or water quenching processing unit), a first heat treatment unit (air cooling zone or heating zone), It has a second heat treatment part (air cooling zone or overaging zone) and a third heat treatment part (air cooling zone or cooling zone). When the roll cooling zone is selected as the cooling processing unit, the first to third heat treatment units function as an air cooling zone, and when the water quenching processing unit is selected as the cooling processing unit, the first to third heat treatment units are selected. Each part functions as a heating zone, an overaging zone, and a cooling zone. And these are accommodated in the continuous annealing furnace.

  If only roll cooling is to be performed, the first to third heat treatment sections may be omitted. However, during the water quenching process, a heating zone or the like is required on the downstream side of the water quenching processing unit. For this reason, in the facility that performs both the roll cooling and the water quenching process as described above, the first to third heat treatment parts are used as the air cooling space without functioning the heating zone or the like during the roll cooling.

  In the roll cooling zone, it is necessary to increase the metal zone tension in order to cool the metal zone by bringing the metal zone into close contact with the cooling roll. The metal band tension is adjusted by a tension adjusting bridle roll arranged on the entry side and the exit side of the roll cooling zone.

  Moreover, since it is necessary to make a roll cooling zone into a low temperature state at the time of roll cooling, in order to prevent inflow of high temperature air, a roll cooling zone is arrange | positioned in a low position. And a metal strip is pulled up by the most upstream roll (furnace top 1st roll) arrange | positioned from the position of a roll cooling zone most upstream in a metal strip conveyance direction in a 1st heat processing part. The most upstream roll is one of the drive rolls constituting the exit side tension adjusting bridle roll, and is connected to the drive motor. The uppermost stream roll is arranged at a higher position than the roll cooling zone, and the height direction distance is also large. Therefore, when the metal band is pulled up by the uppermost stream roll, a large force is required.

  As described above, in continuous annealing equipment that performs both roll cooling and water quenching treatment, the metal band tension in the roll cooling zone is set high, and the metal band is pulled up to the position of the most upstream roll. Great power is required. Therefore, the metal band tension at the position of the most upstream roll is increased, and the metal band is easily deformed by drawing. In addition, it causes a slip in the tension adjusting bridle roll on the roll cooling zone exit side.

  In addition, since the tension applied to the metal band is originally low and the strength of the plate is high compared to the time of roll cooling during the water quenching process, in the equipment configuration that performs only the water quenching process up to the most upstream roll in this way Increasing the metal band tension by pulling up the metal band is not a big problem. However, when the equipment configuration is capable of both roll cooling treatment and water quenching treatment, the metal belt tension is increased in the roll cooling zone. Increase in tension is a big problem.

  Moreover, in the technique of patent document 1, although it is said that the one where a tension | tensile_strength is high in a heating zone, as mentioned above, in the installation which performs both roll cooling and water quenching processing, it is the downstream of a cooling process part. It is necessary to reduce the tension in the heating zone (first heat treatment part) more than before. That is, in the technique of Patent Document 1, it is not assumed that both roll cooling and water quenching are performed. Depending on the technique of Patent Document 1, a metal is located at the position of the most upstream roll on the downstream side of the roll cooling zone. The problem of increased belt tension cannot be solved.

  Then, the objective of this invention is providing the continuous annealing equipment which can suppress the tension | tensile_strength rise in a roll cooling zone downstream, applying a high tension | tensile_strength to a roll cooling zone.

Means and effects for solving the problems

In order to achieve the above object, the continuous annealing equipment according to the present invention has a continuous annealing furnace, and a roll cooling zone and a water quenching processing unit arranged in parallel so that either one can be selected as an annealing path. In the continuous annealing equipment for the metal strip provided, it is provided on the downstream side of the roll cooling zone and the water quenching processing section in the metal strip conveyance direction, and functions as an air cooling zone during roll cooling and as a heating zone during water quenching. A heat treatment part to perform,
An out-of-furnace bridle roll disposed on the entry side and the exit side of the continuous annealing furnace, an entry side tension adjustment bridle roll disposed on the entry side of the roll cooling zone and functioning at least during roll cooling, and the roll cooling zone And an exit-side tension adjusting bridle roll that is disposed on the exit side of the water quenching treatment unit and on the entry side of the heat treatment unit and functions both during roll cooling and during water quenching. The outlet tension adjusting bridle roll is composed of at least two drive rolls connected to a drive motor, and the heat treatment section is provided with one or more upper rolls and lower rolls, respectively. In addition, the upper roll is disposed above the drive roll on the most downstream side in the metal band conveyance direction in the outlet side tension adjusting bridle roll, and is disposed on the most upstream side in the metal band conveyance direction in the heat treatment section. When the roll cooling zone is used, the most upstream roll that is the uppermost roll is a non-driving roll that is the upper side roll and that is pivotally supported so as to rotate freely as the metal band is conveyed. The metal band tension in the heat treatment part is smaller than the metal band tension in the roll cooling zone.

  According to this configuration, the tension adjusting bridle roll is disposed on the inlet side and the outlet side of the roll cooling zone, and the outlet side tension adjusting bridle roll is constituted by two or more drive rolls, thereby cooling the roll. While applying high tension to the belt, the exit side tension adjustment bridle roll can reliably reduce the tension and block the tension between the roll cooling zone and the downstream heat treatment section (air cooling zone or heating zone). it can. In addition, the uppermost stream roll (furnace top first roll) located at the highest position on the most upstream side of the heat treatment part is not the drive roll, but by pushing up the metal strip by the drive roll located at the lower position, Tension rise at the most upstream roll can be suppressed. From the above, an increase in tension on the downstream side of the roll cooling zone can be suppressed while applying high tension to the roll cooling zone. As a result, both roll cooling treatment and water quenching treatment are possible, and the occurrence of drawing in the metal strip is suppressed.

  The entry side tension adjusting bridle roll only needs to function at least during roll cooling, may function only during roll cooling, or may function during both roll cooling and water quenching.

  In the continuous annealing equipment according to the present invention, the tension adjusting bridle roll disposed on the outlet side includes a first bridle roll disposed immediately downstream of the roll cooling unit in the metal band conveying direction, and the first bridle. A second bridle roll disposed immediately downstream of the roll in the metal band conveying direction and disposed above the first bridle roll, the first bridle roll and the second bridle Each of the rolls is composed of at least two drive rolls, and is disposed below the second bridle roll between the second bridle roll and the uppermost roll, and the uppermost roll. The relay roll arrange | positioned below may be provided. According to this, after the metal strip passes through the first bridle roll, it rises and then descends, and then is transported to the most upstream roll of the heat treatment section, so that the tension decreases in this section, and the roll cooling zone And the heat treatment part (air cooling zone or heating zone) are more reliably interrupted.

  The continuous annealing facility according to the present invention may further include a housing portion that houses at least the second bridle roll and is connected to the heat treatment portion at a lower portion. According to this, by covering the second bridle roll portion with the accommodating portion, thermal diffusion is suppressed and the annealing efficiency is improved.

  The metal strip may be a steel strip. According to this, properties can be widely changed by heat treatment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(overall structure)
First, the whole structure of the continuous annealing equipment concerning one embodiment of the present invention is explained, referring to FIG. The upper part of FIG. 1 is a schematic side view showing a state where roll cooling is performed in the continuous annealing facility according to the present embodiment, and the lower part of FIG. 1 is an explanation showing a steel strip tension distribution corresponding to the schematic view. FIG. The continuous annealing equipment 1 according to the present embodiment performs continuous annealing of the steel strip 13, has a continuous annealing furnace 2 and out-of-furnace bridle rolls 6 a and 6 b, and further, inside the continuous annealing furnace 2. Heating zone 14, soaking zone 15, gas jet zone 16, cooling processing unit (roll cooling zone 3 or water quenching processing unit 4), tension adjusting bridle rolls 7a and 7b, first heat treatment unit 5 (air cooling zone or A heating zone), a second heat treatment section 17 (air cooling zone or overaging zone), and a third heat treatment section 18 (air cooling zone or cooling zone). And in a cooling process part, the roll cooling zone 3 and the water quenching process part 4 are arranged in parallel so that any one can be selected as an annealing path | route. With this configuration, both roll cooling processing and water quenching processing can be performed using a single facility. Details of each part will be described below.

(Outside furnace bridle roll)
The out-of-furnace bridle rolls 6a and 6b are disposed on the entry side (upstream side in the transport direction, see the arrow in the figure) and the exit side (downstream side in the transport direction) of the continuous annealing furnace 2. Further, the out-of-furnace bridle rolls 6a and 6b are electrically connected to a computer (not shown) and are configured to be appropriately controlled by the computer. The out-of-furnace bridle roll 6b is controlled mainly for adjusting the speed of the steel strip 13, and the in-outside bridle roll 6a is controlled mainly for adjusting the tension of the steel strip 13.

  The inlet-side out-of-furnace bridle roll 6a and the outlet-side out-of-furnace bridle roll 6b are composed of driving rolls 6a, 6b, 6c and driving rolls 9j, 9k, 9m, respectively. The drive rolls 9a, 9b, 9c, 9j, 9k, 9m are each connected to a drive motor (not shown), and the computer controls their rotation via the drive motor.

(Heating zone, soaking zone, gas jet zone)
The heating zone 14, the soaking zone 15, and the gas jet zone 16 are used in both the roll cooling process and the water quenching process. In the heating zone 14, the steel strip 13 is heated to a predetermined temperature, and in the soaking zone 15, the steel strip 13 is held at the predetermined temperature for a predetermined time. Further, the steel strip 13 is cooled in the gas jet strip 16. These are also provided with an upper roll 8a and a lower roll 8b.

(Cooling processing part)
In the cooling processing unit, the roll cooling zone 3 and the water quenching processing unit 4 are arranged in parallel as described above. During the roll cooling processing, the roll cooling zone 3 is selected as shown in FIG. Moreover, at the time of water quenching process, the water quenching process part 4 is selected like FIG. 2 which shows the state in which the water quenching process is performed with the continuous annealing equipment 1. FIG. Further, since it is necessary to keep the roll cooling zone 3 at a low temperature during roll cooling, the roll cooling zone 3 is disposed at a low position in order to prevent inflow of high-temperature air (see FIG. 1). The same applies to the water quenching processing unit 4.

(Roll cooling zone)
The roll cooling zone 3 is arranged inside the continuous annealing furnace 2 and has a plurality of cooling rolls 12. The cooling roll 12 is a non-driving roll that is pivotally supported so as to freely rotate as the steel strip 13 is conveyed. Further, cooling water circulates through the inside of the cooling roll 12. When the cooling roll 12 and the high-temperature steel strip 13 come into contact with each other, heat exchange is performed between the cooling water and the steel strip 13 through the surface portion of the cooling roll 12 made of a member having good thermal conductivity. The steel strip 13 is cooled. The cooling method of the steel strip by the cooling roll may be other than this. At the time of roll cooling, the steel strip 13 transported from the gas jet strip 16 is transported to the first heat treatment section 5 (air cooling strip) through the roll cooling strip 3 while being in contact with the plurality of rolls 12. .

(Water quenching processing department)
The water quenching processing unit 4 rapidly cools the steel strip 13 using the water 4w in the processing tank 4c, and is disposed below the roll cooling zone 3. A roll 4r is provided inside the processing tank 4c, and a plurality of rolls 11 are provided outside the processing tank 4c (a steel strip path during the water baking process). The roll 4r and the roll 11 are non-driven rolls that are pivotally supported so as to freely rotate as the steel strip 13 is conveyed. And at the time of a water quenching process, the steel strip 13 conveyed from the gas jet strip 16 passes through the water quenching processing section 4 and is in contact with the roll 4c and the roll 11 to the first heat treatment section 5 (heating band). (See FIG. 2). Moreover, at the time of the water quenching process, the steel belt 13 can pass through the water quenching processing unit 4 by removing the necessary part of the floor of the roll cooling zone 3 (see FIG. 2).

  Note that the positional relationship between the roll cooling zone 3 and the water quenching processing unit 4 may be other than this. For example, the roll cooling zone and the water quenching processing unit arranged in parallel in the horizontal direction may be moved in the horizontal direction to switch the roll cooling zone and the water quenching processing unit.

(Bridal roll for tension adjustment)
Also, tension adjusting bridle rolls are arranged on the entry side and the exit side of the cooling processing unit. This will be specifically described below. The entry-side tension adjusting bridle roll 7a is disposed on the entry side of the roll cooling zone 3 and functions (at least) during roll cooling. Further, the exit side tension adjusting bridle roll 7b is disposed on the exit side of the roll cooling zone 3 and the water quenching processing unit 4 and on the entrance side of the heat treatment unit (first heat treatment unit 5), and when the roll is cooled. It functions in both water quenching. The entry-side tension adjustment bridle roll 7a is composed of three drive rolls 9d, 9e, 9f, and the exit-side tension adjustment bridle roll 7b is composed of three drive rolls 9g, 9h, 9i.

  The tension adjusting bridle rolls 7a and 7b are electrically connected to a computer (not shown), and the number of rotations, that is, the steel strip tension in the cooling section is appropriately controlled by the computer. In particular, in the roll cooling zone 3, the steel strip 13 is brought into close contact with the cooling roll 12 to cool the steel strip 13, so that the steel strip tension is controlled to be high (see the explanatory diagram at the bottom of FIG. 1). Further, since the steel strip tension in the first heat treatment section 5 that functions as an air cooling zone during roll cooling need not be higher than the tension in the roll cooling zone 3, when the roll cooling zone 3 is used, the roll cooling is performed. The tension adjusting bridle rolls 7a and 7b are controlled so that the steel strip tension in the first heat treatment section 5 is smaller than the steel strip tension in the strip 3 (see the explanatory diagram in the lower part of FIG. 1).

  The drive rolls 9d, 9e, 9f, 9g, 9h, 9i are each connected to a drive motor (not shown), and the computer controls their rotation via the drive motor.

  Further, all of the drive rolls 9d, 9e, 9f of the entry side tension adjusting bridle roll 7a are used during roll cooling (see FIG. 1), but only the drive roll 9d is used during the water quenching process. (See FIG. 2). On the other hand, as for the exit side tension adjusting bridle roll 7b, all of the drive rolls 9g, 9h, 9i are used in both the roll cooling and the water quenching process.

  In this embodiment, the exit-side tension adjusting bridle roll 7b is composed of three drive rolls 9g, 9h, 9i. However, the exit-side tension adjusting bridle roll is composed of at least two drive rolls. It only has to be done. The same applies to the entry side tension adjusting bridle roll 7a. Further, the entry side tension adjusting bridle roll only needs to function at the time of roll cooling, may function only at the time of roll cooling, or may function at the time of both roll cooling and water quenching. For this reason, the drive roll on the entry side may not be used at all during the water quenching process, and the drive rolls 9d, 9e, 9f may be used at the time of the water quenching process. Good.

(Heat treatment part)
As the heat treatment section, the first heat treatment section 5 (air cooling zone or heating zone), the second heat treatment section 17 (air cooling zone or overaging zone), and the third heat treatment section 18 (air cooling zone or cooling zone) are roll cooling zones. 3 and the water quenching process part 4 (cooling process part) are provided in the steel strip conveyance direction downstream side. And the 1st heat processing part 5 functions as an air cooling zone at the time of roll cooling, and functions as a heating zone at the time of water quenching.

  The first heat treatment section 5 is provided with a plurality of upper rolls 8a and lower rolls 8b. In the present embodiment, there are three upper rolls 8a and two lower rolls 8b in the first heat treatment section, but one or more may be provided. Further, the upper roll 8a is disposed above the drive roll 9i on the most downstream side in the steel strip conveying direction in the outlet tension adjusting bridle roll 7b.

  The most upstream roll 10 is a roll disposed most upstream in the steel strip conveying direction in the first heat treatment section 5 (in the first to third heat treatment sections), and the most upstream roll 10 is the upper roll 8a. And it is the non-driving roll pivotally supported so that it may rotate freely with conveyance of the steel strip 13. The most upstream roll 10 is a roll arranged at the most upstream side in the steel strip conveying direction in the first heat treatment section 5, but when there is only one roll in the first heat treatment section 5, one of the rolls is arranged. Refers to one role.

(Function)
Next, the effect | action of the continuous annealing equipment 1 which concerns on this embodiment is demonstrated. The steel strip 13 is fed from below to the position of the most upstream roll 10 by the exit side tension adjusting bridle roll 7b during roll cooling and water quenching treatment. More specifically, the out-furnace bridle roll 6b pulls the steel strip 13 forward, and the exit-side tension adjustment bridle roll 7b pushes up the steel strip 13, so that the steel strip 13 is fed to the position of the most upstream roll 10. It is done.

  Here, both the roll cooling process and the water quenching process are possible using the schematic side view at the top of FIG. 6, and the most upstream roll (most upstream in the steel strip conveying direction in the first heat treatment unit 905). The continuous annealing equipment in which the rolls arranged in (1) are drive rolls will be described. In the continuous annealing equipment 900 of FIG. 6, the exit side tension bridle roll 907b is comprised from the drive rolls 909h and 909i connected to the drive motor, and the drive roll 909i is the most upstream roll. The steel strip 13 is pulled up from the position in the height direction of the roll cooling zone 903 by the most upstream roll 909i. The most upstream roll 909i is disposed at a higher position than the roll cooling zone 903, and the distance in the height direction is also large. Therefore, when the uppermost roll 909i is pulled up, a large force is required. Moreover, the steel strip tension in the roll cooling zone 903 is high.

  As described above, in the continuous annealing equipment 900, the steel strip tension in the roll cooling zone 903 is set high, and a large force is required to pull the steel strip 13 to a high position. Since the most upstream roll 909i that pulls up the steel sheet is a drive roll, the steel strip tension at the position of the most upstream roll 909i is increased. As a result, the steel strip tension at the position of the most upstream roll 909i increases, and the steel strip 13 is likely to be squeezed and deformed. Further, slip is likely to occur in the tension adjusting bridle roll 909h on the roll cooling zone exit side. The lower part of FIG. 6 shows the steel strip tension distribution corresponding to the equipment configuration. From this tension distribution, it can be seen that the steel strip tension at the time of roll cooling is high, and the steel strip tension remains high even at the position of the most upstream roll 909i.

  On the other hand, according to the configuration of the continuous annealing equipment 1 according to the present invention, the tension adjusting bridle rolls 7a and 7b are disposed on the entry side and the exit side of the roll cooling zone 3, and the exit side tension adjustment bridle roll 7b is provided. By being composed of two or more drive rolls, while applying high tension to the roll cooling zone 3, the exit side tension adjusting bridle roll 7b reliably reduces the tension, so that the roll cooling zone 3 and the downstream side Tension can be interrupted between the heat treatment section 5 (air cooling zone or heating zone). Moreover, the uppermost stream roll 10 (furnace top first roll) arranged at the most upstream side of the heat treatment part, that is, the most upstream side of the first heat treatment part 5 is not used as a driving roll, but at a low position. By pushing up the steel strip 13 with the arranged drive roll, it is possible to suppress an increase in tension at the uppermost stream roll 10. From the above, an increase in tension on the downstream side of the roll cooling zone 3 can be suppressed while applying high tension to the roll cooling zone 3. As a result, both roll cooling treatment and water quenching treatment are possible, and the occurrence of drawing in the steel strip is suppressed.

  Moreover, in this embodiment, since the steel strip is used as a metal strip used as a process target, the property can be changed widely by heat treatment. Note that the steel strip is shown as an example of a metal strip, and other types of metal strips such as aluminum, aluminum alloy, copper, copper alloy, and the like may be treated.

(Application example)
Next, an application example of the continuous annealing facility 1 according to the present invention will be described. In this application example, in order to stabilize the cooling efficiency of the roll cooling, the outlet side tension adjusting bridle roll 7a with respect to the inlet side tension adjusting bridle roll 7a (the inlet side tension of the driving roll 9d) Td. Suppose that the size of the entry side tension (entrance on the drive roll 9g) Ti is 1.6 times greater. This is because when the tension is 1.6 times (or more), the plate is brought into close contact with the cooling roll and cooling is performed efficiently. Further, in order to suppress an increase in tension in the first heat treatment section 5, the entry-side tension adjusting bridle roll 7a (input-side tension of the drive roll 9d) Td and the exit-side tension adjusting bridle roll 7a are used. It is optimal that the exit tension (exit tension of the drive roll 9i) To be equal. The tension To is equal to the entry side tension of the most upstream roll 10. From the above, Ti = 1.6 × Td and Td = To, and from these, Ti = 1.6 × To (Formula 1) is derived.

FIG. 3 shows an enlarged view of the vicinity of the exit side tension adjusting bridle roll 7b. Then, the entry side steel strip tension of the drive roll 9g is T ₁ , the exit side tension of the drive roll 9g (= entrance side of the drive roll 9h) is T ₂ , and the exit side tension of the drive roll 9h (= entrance of the drive roll 9i) (Side tension) is T ₃ , and the exit side tension of the drive roll 9i (= the entry side tension of the most upstream roll 10) is T ₄ . Here, T ₁ = Ti and T ₄ = To. Further, the winding angles of the steel strip 13 with respect to the drive rolls 9g, 9h, and 9i are set to θ ₁ , θ ₂ , and θ ₃ , respectively.

When the effective winding angle of the steel strip 13 is α [rad] and the friction coefficient between the steel strip 13 and the drive roll is μ, it is expressed as Ti / To = e ^αμ , so α = ln (Ti / To) / Μ.
Here, from Equation 1,
α = ln (Ti / To) / μ
= Ln (1.6 × To / To) / μ
= Ln1.6 / μ
From the above,
α = 0.47 / μ (Formula 2)

Here, T ₂ and T ₃ when the calculation conditions are set as follows are obtained by calculation.
T ₁ : 5888 [kgf]
T ₄ (= T1 / 1.6): 3680 [kgf]
θ ₁ : 104 [°] = 1.815 [rad]
θ ₂ : 205 [°] = 3.578 [rad]
θ ₃ : 191 [°] = 3.334 [rad]
μ: 0.2 (assuming that the drive roll is made of polyurethane)

From Equation 2, α = 0.47 / 0.2 = 2.35.
θ _TOTAL = θ ₁ + θ ₂ + θ ₃ = 8.726 [rad]
θ ₁ ′ = α × θ ₁ / θ _TOTAL = 0.489
θ ₂ ′ = α × θ ₂ / θ _TOTAL = 0.964
θ ₃ ′ = α × θ ₃ / θ _TOTAL = 0.898
T ₂ = T ₁ / e ^ (μθ ₁ ′) = 5888 / e ^{0.2 × 0.489} = 5339 [kgf]
T ₃ = T ₂ / e ^ (μθ ₂ ′) = 5339 / e ^{0.2 × 0.964} = 4403 [kgf]

Next, three drive motor outputs P ₁ , P ₂ , and P ₃ for driving the drive rollers 9g, 9h, and 9i are calculated using the obtained values of T _{1 to} T ₄ , respectively. Here, the calculation conditions are set as follows.
Steel strip thickness: 2.3 [mm]
Board width 1600 [mm]
Plate (conveyance) speed V: 250 [mpm (meter per minute)]
Mechanical efficiency η: 0.90

P ₁ , P ₂ , and P ₃ are as follows.
P ₁ = [(T ₁ −T ₂ ) × V] / (6120 × η) = [(5888-5339) × 250] /5508=24.9 [kW]
P ₂ = [(T ₂ −T ₃ ) × V] / (6120 × η) = [(5339-4403) × 250] /5508=42.5 [kW]
P ₃ = [(T ₃ −T ₄ ) × V] / (6120 × η) = [(4403-3680) × 250] /5508=32.8 [kW]
In this way, the output of the drive motor can be calculated.

(Modification)
Next, a modified example of the continuous annealing facility according to the present invention will be described with a focus on differences from the above embodiment with reference to FIGS. 4 and 5 are schematic views showing a modification of the continuous annealing facility according to the above-described embodiment. FIG. 4 shows the time of roll cooling and FIG. 5 shows the time of water quenching treatment. In addition, about the part similar to said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the continuous annealing facility 100 according to this modification, the outlet side tension adjusting bridle roll 107b is configured to include a first bridle roll 20a and a second bridle roll 20b. And the 1st bridle roll 20a is arrange | positioned in the steel strip conveyance direction downstream of the roll cooling part 3, and the 2nd bridle roll 20b is arrange | positioned in the steel strip conveyance direction downstream immediately of the 1st bridle roll 20a. And it is arrange | positioned above the 1st bridle roll 20a. The first bridle roll 20a in the present modification corresponds to the exit side tension adjusting bridle roll 7b in the above embodiment. In addition, the first bridle roll 20a and the second bridle roll 20b are configured to include driving rolls 9g, 9h, 9i and driving rolls 9n, 9o, 9p, respectively. In addition, although comprised in this embodiment in this embodiment, the 1st bridle roll and the 2nd bridle roll should just be comprised from at least 2 drive roll, respectively.

  And between the 2nd bridle roll 20b and the uppermost stream roll 10 in the 1st heat processing part 5, it is arrange | positioned below the 2nd bridle roll 20b, and is arrange | positioned below the uppermost stream roll 10. Two relay rolls 21 are provided. Further, in the continuous annealing equipment 100, a storage unit 19 that is connected to the first heat treatment unit 5 in the lower part (in which the internal space communicates) is provided between the roll cooling zone 3 and the first heat treatment unit 5. It has been. The accommodating part 19 is comprised so that the 2nd bridle roll 20b and the relay roll 21 may be accommodated. In addition, the accommodating part should just accommodate the 2nd bridle roll at least.

  According to this configuration, after the steel strip 13 has passed through the first bridle roll 20a, the steel strip 13 is once raised and then lowered, and then transported to the most upstream roll 10 of the first heat treatment part 5, so that the accommodating part Since the tension further decreases in the section 19, the tension is more reliably interrupted between the roll cooling zone 3 and the first heat treatment section 5 (air cooling zone or heating zone). Moreover, by covering the second bridle roll portion 20b with the accommodating portion 19, thermal diffusion is suppressed and annealing efficiency is improved.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

The side view schematic diagram which shows the state in which roll cooling is performed with the continuous annealing equipment which concerns on one Embodiment of this invention, and explanatory drawing which shows the steel strip tension distribution corresponding to the said schematic diagram. The side view schematic diagram which shows the state in which the water quenching process is performed with the continuous annealing equipment of FIG. FIG. 3 is an enlarged explanatory view of the vicinity of a delivery-side tension adjusting bridle roll in the continuous annealing facility of FIG. 1. The side view schematic diagram which shows the state by which roll cooling is performed with the continuous annealing equipment which concerns on a 1st modification. The side view schematic diagram which shows the state in which the water quenching process is performed with the continuous annealing equipment of FIG. The side view schematic diagram which shows the state in which roll cooling is performed in the continuous annealing equipment whose uppermost stream roll is a drive roll, and explanatory drawing which shows the steel strip tension distribution corresponding to the said schematic diagram.

Explanation of symbols

1,100 continuous annealing equipment 2 continuous annealing furnace 3 roll cooling zone 4 water quenching treatment part 5 first heat treatment part (heat treatment part)
6a Entrance side outside bridle roll 6b Exit side outside bridle roll 7a Entrance side tension adjusting bridle roll 7b, 107b Exit side tension adjusting bridle roll 8a Upper side roll 8b Lower side rolls 9a to 9p Driving roll 10 Most upstream roll ( Non-driving roll)
13 Steel strip (metal strip)
19 Accommodating portion 20a First bridle roll (briddle roll for outlet side tension adjustment)
20b 2nd bridle roll (bridal roll for tension adjustment on the exit side)
21 Relay roll

Claims (4)

In a continuous annealing facility of a metal strip provided with a roll cooling zone and a water quenching treatment unit arranged in parallel so that a continuous annealing furnace can be selected as one of the annealing paths,
A heat treatment section provided on the downstream side of the roll cooling zone and the water quenching processing section in the metal band transport direction, functioning as an air cooling zone during roll cooling, and functioning as a heating zone during water quenching;
An out-of-furnace bridle roll disposed on the entry side and the exit side of the continuous annealing furnace,
A bridle roll for adjusting the inlet side tension, which is arranged on the inlet side of the roll cooling zone, and functions at least during roll cooling;
An exit-side tension adjusting bridle roll disposed on the exit side of the roll cooling zone and the water quenching treatment unit and on the entry side of the heat treatment unit and functioning both at the time of roll cooling and at the time of water quenching. And
The outlet tension adjusting bridle roll is composed of at least two drive rolls connected to a drive motor,
The heat treatment section is provided with one or more upper rolls and lower rolls, and the upper roll is the most downstream of the drive roll on the downstream side in the metal band conveying direction in the exit side tension adjusting bridle roll. Located above,
The most upstream roll, which is the roll disposed most upstream in the metal band transport direction in the heat treatment section, is the upper roll and is a non-supported shaft that is freely rotated as the metal band is transported. A driving roll,
When the roll cooling zone is used, the continuous annealing equipment is characterized in that the metal band tension in the heat treatment part is smaller than the metal band tension in the roll cooling zone. The tension adjusting bridle roll arranged on the outlet side includes a first bridle roll arranged immediately downstream of the roll cooling section in the metal band conveying direction and a downstream side of the first bridle roll immediately in the metal band conveying direction. And a second bridle roll disposed above the first bridle roll, and
Each of the first bridle roll and the second bridle roll is composed of at least two drive rolls,
Between the second bridle roll and the most upstream roll, there is provided a relay roll disposed below the second bridle roll and disposed below the most upstream roll. The continuous annealing equipment according to claim 1, wherein   The continuous annealing facility according to claim 2, further comprising a housing portion that houses at least the second bridle roll and is connected to the heat treatment portion at a lower portion.   The continuous annealing equipment according to any one of claims 1 to 3, wherein the metal strip is a steel strip.

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