JP3094174B2 - Elongation rate control method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a continuous annealing equipment (CA).
L) and the like and a method and an apparatus for controlling elongation in a temper rolling mill (skin pass mill).

[0002]

2. Description of the Related Art In general, the elongation percentage is defined by elongation percentage = (skin pass exit side velocity-skin pass entrance side velocity) / (skin pass entrance side velocity).

The conventional elongation rate control device operates the rolling load of the skin pass mill or the input side tension (or the output side tension) of the skin path mill so that the actual value of the elongation rate becomes equal to the set value of the elongation rate. The entrance speed and skin pass exit speed were changed. A specific control method is proportional-integral (proportional +) in which the elongation deviation is input and the speed control signal of the bridal roll and the control signal of the rolling load are output.
integral) control.

[0004]

In the above prior art, the elongation is made constant by controlling the rolling load or the tension applied to the rolled material. However, no consideration is given to the tension fluctuation caused by operating the rolling load or the fluctuation of the rolling load caused by operating the tension, that is, the interference between the rolling load and the tension. In some cases, the rolling load cannot be controlled continuously. Furthermore, since the skin pass entrance speed and the exit speed are controlled by manipulating the rolling load and tension, it takes time until the skin pass entrance speed and the exit speed actually change, and the elongation rate converges slowly. This causes a decrease in product surface quality and a decrease in yield. In addition, by controlling the elongation by manipulating the tension, the fluctuation of the rolling load caused by manipulating the tension is controlled by the rolling reduction control. However, it is difficult to predict the amount of change in the rolling load caused by manipulating the tension, and thus it is difficult to suppress the change in the rolling load by the rolling reduction control.

An object of the present invention is to achieve high precision and high response of elongation control in a skin pass mill.

[0006]

An object of the present invention is to provide an elongation rate meter for detecting an elongation rate, a rolling elongation rate control gain and a speed elongation rate in accordance with a deviation between the output of the elongation rate meter and a set elongation rate. Fuzzy inference means for setting the rate control gain; rolling elongation rate control means for controlling the rolling load control means of the skin pass mill based on the rolling elongation rate control gain; and speed of the skin path mill based on the speed elongation rate control gain. This is achieved by an elongation control device for a temper rolling mill, comprising a speed elongation control means for controlling the control means.

The above object is also achieved by an elongation meter for calculating an elongation rate based on an input rolling material speed signal, an elongation rate setting means for setting an elongation rate, a rolling elongation rate control gain and a speed elongation by fuzzy inference. Elongation / tension control device for calculating / outputting the rate control gain, and speed elongation rate control means for controlling the elongation rate to a predetermined value by directly changing the speed of the rolled material based on the input speed elongation rate control gain And a rolling elongation control device for a temper rolling mill including a rolling elongation controlling means for controlling a rolling load applied to the rolled material based on an input rolling elongation control signal.

[0008] The above-mentioned object also provides an elongation rate control apparatus for a temper rolling mill for controlling the speed control means and the rolling load control means of the temper rolling mill for temper rolling the rolled material to control the elongation rate of the rolled material. An elongation setting means for setting the elongation, an elongation meter for calculating the actual elongation based on the input rolling material speed signal, and a difference between the set elongation and the calculated actual elongation. Subtraction means for outputting as an elongation rate deviation, an elongation / tension control device for calculating a rolling elongation rate control gain and a speed elongation rate control gain by fuzzy inference, and a rolling elongation from the elongation rate deviation and the rolling elongation rate control gain. A rolling elongation rate control means for generating a rate control signal and outputting it to the rolling load control means; and generating a speed elongation rate control signal from the elongation rate deviation and the speed elongation rate control gain and outputting the signal to the speed control means. Speed Also achieved by configuring and a beauty rate control means.

The above object is also achieved by the elongation rate / tensile control device which presupposes the elongation state of a rolled material, the state of a rolling load, and the state of the entry side tension as if conditions (if conditions), and a reduction elongation rate control gain and a speed. Set the elongation rate control gain at the latter stage (then condition)
It is also achieved according to the elongation rate control device of the temper rolling mill according to claim 3, which stores a rule to be described.

The above object is further achieved by a method of controlling the elongation of a temper rolling mill in which the elongation of the rolled material is controlled by controlling the speed control means and the rolling load control means of the temper rolling mill for temper rolling the rolled material. The elongation percentage is set by the elongation percentage setting means, the actual elongation percentage is calculated based on the input rolling material speed signal, and the difference between the set elongation percentage and the calculated actual elongation percentage is defined as the elongation percentage deviation. Output, at least the state of the elongation of the rolled material, the state of the rolling load, and the state of the entry-side tension are assumed as preconditions (if conditions), and the rolling elongation rate control gain and the speed elongation rate control gain are assumed as subsequent conditions (then conditions). A rolling elongation rate control gain and a speed elongation rate control gain are calculated by fuzzy inference using a rule, a rolling elongation rate control signal is generated from the elongation rate deviation and the rolling elongation rate control gain, and the rolling load control means is generated. Outputs also achieved by generate a speed elongation control signal from said elongation difference between the speed elongation control gain configured to include the steps of outputting said speed control means.

[0011]

[Effect] The elongation rate meter takes in the speed on the skin pass entrance side and the speed on the skin pass exit side (the number of counters of each PLC) and calculates the elongation rate. The deviation of the elongation percentage set from the CRT or P / C and the elongation percentage calculated by the elongation meter are multiplied by the rolling elongation rate control gain and the speed elongation rate control gain, and the rolling elongation rate control means and the speed elongation rate control means, respectively. Sent to

The rolling elongation rate control means performs control for the purpose of reducing the elongation rate deviation multiplied by the rolling elongation rate control gain to zero.

The speed elongation rate control means performs control for the purpose of reducing the elongation rate deviation multiplied by the speed elongation rate control gain to zero.

The elongation / tensile cooperative control device performs fuzzy inference based on the elongation state, the tension state, and the rolling load state of the rolled material to control the rolling load and speed control gains (rolling elongation rate control gain and speed elongation). Rate control gain).

The sum of the rolling elongation rate control gain and the speed elongation rate control gain is set to 1.

For example, if the rolled material has insufficient elongation (actual elongation ratio <elongation set value), the rolling load or the tension on the skin pass entrance side is increased, and the deviation between the skin pass entrance side and exit side speed is increased. This increases the elongation.

Here, the rolling load is smaller than the set value,
If the skin pass entry side tension is larger than the set value, increasing the speed avoids the operation of increasing the tension and approaching the tension limit, and increasing the rolling load to bring the elongation percentage closer to the set value. That is, the rolling elongation rate control gain is set to “Big (large)” and the speed elongation rate control gain is set to a small value (or 0).

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 2 is a schematic diagram of a continuous annealing facility (CAL), in which the rolled material fed from a pay-off reel POR is:
After passing through the tension leveler T / L, the heating furnace of the central section 19 via the entrance louver, it is wound on the tension reel TR via the exit louver, the skin pass mill 21, the notcher and the trimmer. The skin pass mill 21 is located in the outlet section 20 and is a facility for processing the surface of a product. The purpose of the skin pass mill 21 is to improve the surface roughness, give gloss, prevent vertical wrinkles, and prepare the shape. And controlled by elongation rate control.

The elongation percentage is, as described above, elongation percentage = (skin pass exit side speed−skin pass entrance side speed) ÷
(Skin pass entrance side speed).

FIG. 3 shows an example in which the elongation control device according to the embodiment of the present invention is applied to a skin pass mill. An entrance bridle roll 39 and an exit bridle roll 41 are disposed on the entrance side and exit side of the skin path mill 21, respectively. Sensors 22 and 23 for detecting the entrance side velocity and the exit side velocity of the skin pass are provided on each bridle roll. Is provided. An elongation meter 29 is connected to the sensors 22 and 23, and the skin path mill control device 2 is connected to the elongation meter 29. Inlet bridle roll 39 and skin pass mill 2
1 and the outgoing bridle roll 41 are provided with an incoming ASR (Automatic Speed Regulator) for controlling respective speeds.
35, the skin path ASR 36, and the output side ASR 37 are connected to each other, and the input side ASR 3
5. The speed controller 1 is connected to the input side of the skin path ASR 36 and the output side ASR 37. The skin pass mill 21 is provided with a load meter for measuring a rolling load, and the output side of the load meter is connected to a subtractor 55 on the input side of a hydraulic pressure reduction device 56 which is a rolling load control means of the skin pass mill 21. The input side of the input side ASR 35, the input side of the output side ASR 37, and the input side of the subtractor 55 are connected to the output side of the skin pass mill control device 2. Skin pass mill 2
1 and the entrance ASR 35, the skin pass mill 21 and the exit A
TM51,5 for detecting the tension of the rolled material during SR37
The output 2 is connected to the speed control device 1. The skin pass mill control device 2 also includes
A process controller (process controller) 25 for performing tracking processing and the like on the rolling line and a CRT 26 are connected. The process control 25 and the CRT 26 are also elongation rate setting means.

The speed control device 1 includes a speed reference 38, an entrance ATR (Automatic Tention Regulator), and an exit ATR. The output side of the speed reference 38 is connected to the entrance ASR 35 and the entrance ASR 35 The output side of the ATR is the input side of the skin path ASR 36, the input side of the input side ATR is the output side of the TM51, the output side of the output side ATR is the output side ASR 37, and the input side of the output side ATR is the TM52.
, Respectively.

The skin pass mill control device 2 includes a set elongation rate storage unit 53, a subtractor 54 as subtraction means connected to the set elongation rate storage unit 53 and the elongation rate meter 29, and an output of the subtractor 54. Are connected via multipliers 31A and 32A respectively to a rolling elongation rate control device 31 as a rolling elongation rate controlling means and a speed elongation rate controlling device 32 as a speed elongating rate controlling means. , 32A connected to the input side of the elongation and tension emphasis control device 30 for performing fuzzy inference. Set elongation rate storage unit 5
3 is connected to the process controller 25 and the CRT 26, the output side of the rolling elongation rate control device 31 is on the input side of the subtractor 55, and the output side of the speed elongation rate control device 32 is on the input side of the skin path ASR 36 and the input side of the output side ASR. , Are connected respectively. Although not shown in FIG. 3, the elongation / tensile stress emphasizing control device 30 stores the elongation state of the rolled material (whether the actual elongation value is larger or smaller than the set elongation value) and the rolling load. The state (whether the actual rolling load value is greater than or equal to the rolling load set value) and the state of the incoming tension (whether the actual incoming load value is greater than or less than the incoming tension set value) are input. ing.

The operation of the apparatus having the above configuration will be described below.
When rolling is started, the skin pass mill entrance speed and the skin pass mill exit speed of the rolled material detected by the sensors 22 and 23 are taken into the elongation meter 29. The elongation rate meter 29 calculates the actual elongation rate value 24 using the above equation, and inputs the calculation result to the subtractor 54 of the skin pass mill control device 2. Further, the set elongation percentage storage unit 53 of the skin pass mill control device 2 is provided with the elongation percentage set value 27 from the CRT 26 equipped with the computer 25 and the light pen in advance, and the subtractor 54 inputs the elongation percentage set from the elongation percentage meter 29. A deviation (elongation deviation) 28 between the actual elongation percentage value 24 and the elongation percentage set value 27 is calculated.

The elongation / tensile cooperative control device 30 controls the elongation state of the rolled material (whether the actual elongation value is larger or smaller than the elongation set value) and the state of the rolling load (the actual rolling load value is equal to the rolling load setting value). Fuzzy inference of the magnitude of the rolling elongation control gain 4 according to the entry tension state (whether the actual entry tension value is greater than or less than the entry tension setting value). Prepared,
The size of the rolling elongation rate control gain 34 and the magnitude of the speed elongation rate control gain 33 are determined by fuzzy inference according to these rules and the input elongation state of the rolled material, the state of the rolling load, and the state of the entry side tension. I do.

Elongation rate deviation 28 and elongation rate / tensile cooperative control device
The product of the speed elongation rate control gain 33 and the rolling elongation rate control gain 34 determined by fuzzy inference in 30 is a multiplier 31
A, 32A, and the calculation result is the rolling elongation rate control device
Output to the speed elongation rate control device 31 and 31. The rolling elongation control device 31 uses the input product as a control input, inputs a rolling elongation control signal for performing proportional-integral control of the rolling load of the skin pass mill to the hydraulic rolling device 56 via a subtractor 55, and outputs the rolling load. Control. The speed elongation rate control device 32 outputs a speed elongation rate control signal for performing proportional-integral control of the speed of the skin path ASR 36 and the output side ASR 37 using the input product as a control input, and performs speed control.

Referring to FIG. 4, the problem of the speed elongation rate control will be described. In the speed elongation rate control, since the elongation rate is a speed ratio, the speed is directly controlled to obtain a high response. However, a speed reference is given to the skin path ASR36, and by operating the skin path ASR36 and the skinpath output side ASR37 by speed control, a speed deviation occurs between the entrance side bridle roll 39 and the skinpath mill 21 and rolling is performed. The tension of the material fluctuates. If the tension fluctuation is large, the rolled material may be wrinkled, the surface gloss may be deteriorated, and in some cases, the plate may be cut.

In order to prevent this tension fluctuation, there is a method of limiting the tension that can be controlled. However, if the elongation rate control is performed within the tension limit range, the speed cannot be operated when the tension reaches the limit value during the control.

As a countermeasure for this problem, there is provided:
An elongation / tensile cooperative control device 30 that suppresses fluctuations in tension during speed control by rolling down control (rolling load control). The elongation / tensile cooperative control uses fuzzy inference because the elongation rate control model is uncertain.

Referring to FIG. 1, an elongation / tensile cooperative control device will be described.
30 will be explained. The purpose of this elongation rate / tensile cooperative control device is to perform reduction control 2 while performing speed control 1 to control the elongation rate to a set value.

Fuzzy inference rule 3 is based on the elongation state of the rolled material (whether the actual elongation percentage is larger or smaller than the set elongation percentage),
Rolling load state (rolling load actual value is larger or smaller than rolling load set value), entry side tension state (entrance tension state is larger or smaller than entry side tension setting value) Rules for inferring the magnitude of the elongation rate control gain 33 are provided, and the rolling elongation rate control gain is determined according to these rules and the state of the elongation, the state of the rolling load, and the state of the input side tension of the input rolled material.
The size of 34 and the speed elongation rate control gain 33 are determined. As described above, both values are determined such that the sum of the rolling elongation rate control gain and the speed elongation rate control gain becomes 1.

For example, when the rolled material is excessively elongated, in order to keep the elongation constant, the rolling load or the entry side tension is reduced,
It is necessary to make the rolled material easily pass through the skin pass mill.
In this case, the deviation between the speed on the skin pass exit side and the speed on the skin pass entrance side decreases, and the elongation rate decreases.

If the rolled material is too stretched and the actual rolling load value is greater than the rolling load set value and the entry tension actual value is greater than the entry tension setting value, the rolling load and entry tension are reduced simultaneously. That is, the rolling elongation rate control gain 33 is set to “Middle
(Medium) ", which is almost equal to the speed elongation rate control gain (example: reduction elongation rate control gain 0.5, speed elongation rate control gain 0.5).

When the rolled material is too stretched, the actual rolling load value is smaller than the rolling load set value, and the actual entry tension value is greater than the entry tension setting value, the setting value is obtained by performing only the operation of lowering the rolling load. Is further increased, the entry-side tension acts greatly on the rolled material, and the sheet is easily broken by the tension. Therefore, an operation to reduce the entry side tension, that is, a command to increase the entry side speed is issued instead of operating only the rolling load.
That is, since it is desired to actively control the entry side tension rather than the rolling load, the rolling elongation rate control gain 33 is set to “Small”.
And increase the speed elongation rate control gain (example: rolling elongation rate control gain 0.2 speed elongation rate control gain 0.
8).

When the rolled material is excessively elongated, the actual rolling load value is larger than the rolling load set value, and the actual entrance tension value is smaller than the entrance tension set value, the deviation from the set value is reduced when the entrance tension is lowered. Is further increased, the rolling load acts greatly on the rolled material, and the sheet is easily broken by the rolling force. Therefore, an operation for reducing the rolling load is performed instead of operating only the entry side tension. That is, since it is desired to actively control the rolling load rather than the entry-side tension, the rolling elongation rate control gain 33 is set to “Big”.
(Large) ”to reduce the speed elongation rate control gain (eg, rolling elongation rate control gain 0.8, speed elongation rate control gain 0.2).

In order to keep the elongation percentage constant when the rolled material is insufficiently stretched, it is necessary to increase the rolling load or the entry side tension to make the rolled material difficult to pass through the skin pass mill.
In other words, skin pass exit speed 23 and skin pass entrance speed 22
And the elongation percentage increases.

If the rolled material is insufficiently stretched, the actual rolling load value is smaller than the rolling load set value, and the actual entrance tension value is smaller than the entrance tension set value, the rolling load and the entrance tension are simultaneously increased. That is, the rolling elongation rate control gain 33 is set to “Middle
(Medium) ", which is almost equal to the speed elongation rate control gain (example: reduction elongation rate control gain 0.5, speed elongation rate control gain 0.5).

When the rolled material is insufficiently stretched, the actual rolling load value is smaller than the rolling load set value, and the actual entrance tension value is greater than the entrance tension set value, the deviation from the set value is increased when the entrance tension is increased. Becomes even larger and approaches the tension limit. That is, the rolled material is easily broken due to excessive tension. Therefore, the operation of increasing the rolling load is performed instead of operating only the entry side tension. That is, since the rolling load is more positively manipulated than the entry side tension, the rolling elongation rate control gain is set to “Big” and the speed elongation rate control gain is reduced (eg, the rolling elongation rate control gain 0.8 Speed elongation rate control gain 0.2).

When the rolling material is insufficiently stretched, the actual rolling load value is larger than the rolling load set value, and the actual entrance tension value is smaller than the entrance tension set value, the deviation from the set value is increased when the rolling load is increased. It becomes even larger and approaches the load limit (load limit of the rolling mill). That is, the rolled material is easily broken by an excessive rolling load. Therefore, it is not necessary to operate only the rolling load, but to increase the entry-side tension.
That is, since it is desired to actively control the entry side tension rather than the rolling load, the rolling elongation rate control gain is set to “Small (small)” and the speed elongation rate controlling gain is increased (eg, the rolling elongation rate control gain 0.2 Speed elongation rate control gain 0.
8).

The concept of the fuzzy inference rule 3 will be described with reference to FIG. The actual growth rate is either greater than, equal to, or less than the growth rate setting,
The rolled material is too stretched 42, and when it is small, it is undergrown 43. When the rolled material is excessively stretched 42, the deviation between the skin pass entrance speed and the skin pass exit speed is reduced by lowering the rolling load or entry tension. As a result, the actual growth rate value decreases and approaches the set growth rate value. Insufficient elongation of rolled material
In the case of 43, the deviation between the skin pass entrance speed and the skin pass exit speed is increased by increasing the rolling load or the entrance tension. As a result, the actual growth rate increases and approaches the set growth rate.

In the fuzzy inference rule 3 shown in FIG. 1, the value of the rolling elongation rate control gain is set in two categories, that is, the entry side tension, the rolling load, and the elongation rate are larger or smaller than the set values. However, more precise control can be performed by increasing the number of sections. Further, in order to execute the inference rule 3 which is finely divided, a membership function 9 of an entrance tension 6, a rolling load 7, and an elongation 8 is defined and stored in the elongation / tensile cooperative control device 30. .

The horizontal axis of the membership function 9 is TM51
Is the actual value of the input tension 6, which is input from the rolling load 7, which is input from the load meter, and the elongation 8 which is input from the elongation meter 29. Rolling load 7,
0 when the actual value of elongation 8 is equal to the set value,
This is an n-order function (in this example, a linear function) in which the upper and lower limit values are set to 1. The certainty from 0 to 1 is classified according to the number of inference rule divisions when the actual value is larger than the set value and when the actual value is smaller than the set value. , Rolling load 7, and elongation 8 are determined to which of the certainty categories the certainty factor corresponds to. When the corresponding section of each of the entry side tension, the rolling load, and the elongation rate is determined, the inference rule corresponding to the determined section is referred to, and the rolling elongation rate control gain and the speed elongation rate control gain are output.

FIG. 7 shows an example of correspondence with the inference rules when the certainty corresponding to the actual values of the entrance tension, the rolling load, and the elongation are divided into a plurality of certainty categories. Αg1 in the figure
The value of 1 to αg68 is set based on the knowledge and experience of a control expert.

The effect of the fuzzy elongation / tension cooperative control device will be described with reference to FIG. The elongation / tensile cooperative control device operates the rolling load of the skin pass mill or the speed of the skin pass mill to obtain the actual elongation ratio.
In addition to bringing the value close to the set value and making it constant, the actual operation of the rolling load (rolling load and speed) is adjusted according to the state of the actual rolling load or the actual tension.
8. The actual tension value 46 49 can be set close to the set value.

Whether the rolling load or the entry side tension is to be positively operated is determined by the one that can reduce the deviation between the actual value and the set value.

[0046]

According to the present invention, when performing speed control for elongation control, the reduction control gain necessary for suppressing the fluctuation of the rolling load generated by the speed control is fuzzy inferred. The rolling control is simultaneously performed to suppress the fluctuation of the rolling load generated by the speed control, so that the elongation control can be made more responsive without causing the tension fluctuation, which is the drawback of speed control, in elongation control. This has the effect of improving the quality of the product and improving the yield during rolling acceleration.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating the principle of the present invention.

FIG. 2 is a schematic diagram of a continuous annealing facility as an example of a plant to which the present invention is applied.

FIG. 3 is a block diagram illustrating a main configuration of an embodiment of the present invention.

FIG. 4 is an explanatory diagram of speed control of a skin pass mill.

FIG. 5 is an explanatory diagram of a fuzzy inference rule.

FIG. 6 is an explanatory diagram of a fuzzy inference rule.

FIG. 7 is an explanatory diagram of a relationship between a membership function and a fuzzy inference rule.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Speed control apparatus 2 Skin path mill control apparatus 3 Fuzzy inference rule 21 Skin path mill 22, 23 sensor 25 Elongation rate setting means (process controller) 26 Elongation rate setting means (CRT) 29 Elongation rate meter 30 Elongation rate and tension coordination control apparatus ( Fuzzy inference means) 31 rolling elongation rate control means 32 speed elongation rate controlling means 33 rolling elongation rate control gain 34 speed elongation rate control gain 36 speed control means (skin pass ASR) 37 speed control means (outside ASR) 38 speed reference 39 input Side bridle roll 41 Outgoing bridle roll 51,52 Tensiometer 54,55 Subtraction means 56 Rolling load control means (hydraulic pressure reduction device)

──────────────────────────────────────────────────続 き Continued from the front page (72) Inventor Yoshihiro Kamigane 5-2-1 Omika-cho, Hitachi City, Ibaraki Prefecture Inside the Hitachi, Ltd. Omika Plant (56) References JP-A-57-14409 (JP, A) JP-A-59-64113 (JP, A) JP-B-59-42568 (JP, B2) JP-B1-47244 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 37/56

Claims (5)

(57) [Claims] An elongation meter for detecting an elongation rate, and fuzzy inference for setting a rolling elongation rate control gain and a speed elongation rate control gain in accordance with a difference between an output of the elongation meter and a set elongation rate. Means, a rolling elongation rate control means for controlling a rolling load control means of the skin pass mill based on the rolling elongation rate control gain, and a speed elongation rate for controlling the speed control means of the skin path mill based on the speed elongation rate control gain. An elongation control device for a temper rolling mill, comprising: a control unit. 2. A speed elongation rate control means for controlling the elongation rate to a predetermined value by directly changing the speed of a rolled material based on an input speed elongation rate control signal; Rolling elongation rate control means for controlling a rolling load applied to the rolled material based on the rolling elongation rate control gain and speed elongation rate control gain by fuzzy inference, the rolling elongation rate control means and the speed elongation rate control means Elongation / tensile control device that outputs the elongation rate based on an input rolling material speed signal, and elongation rate setting means that sets the elongation rate. Elongation control device for rolling mill. 3. An elongation rate control device for a temper rolling mill for controlling an elongation rate of a rolled material by controlling a speed control means and a rolling load control means of a temper rolling mill for temper rolling a rolled material. Elongation rate setting means for setting, an elongation meter that calculates the actual elongation rate based on the input rolling material speed signal, and the difference between the set elongation rate and the calculated actual elongation rate as an elongation rate deviation Subtraction means for outputting; an elongation / tensile control device for calculating a rolling elongation rate control gain and a speed elongation rate control gain by fuzzy inference; and a rolling elongation rate control signal from the elongation rate deviation and the rolling elongation rate control gain. A rolling elongation rate control means for generating and outputting the rolling elongation rate control means to the rolling load control means; and a speed elongation rate for generating a speed elongation rate control signal from the elongation rate deviation and the speed elongation rate control gain and outputting the signal to the speed control means. Control hand An elongation control apparatus for a temper rolling mill, comprising: a step; 4. The elongation rate / tensile control device assumes a state of elongation of a rolled material, a state of a rolling load, and a state of an entry side tension as preconditions (if conditions), a rolling elongation rate control gain and a speed elongation rate control gain. The elongation rate control device for the temper rolling mill according to claim 3, wherein a rule for setting the following condition (then condition) is stored. 5. An elongation rate control method for a temper rolling mill for controlling an elongation rate of a rolled material by controlling a speed control means and a rolling load control means of a temper rolling mill for temper rolling a rolled material. The elongation percentage is set by the setting means, the actual elongation percentage is calculated based on the input rolling material speed signal, and the difference between the set elongation percentage and the calculated actual elongation percentage is output as an elongation percentage deviation, at least. A rule was used in which the state of elongation, the state of rolling load, and the state of entry tension of the rolled material were assumed as preconditions (if conditions), and the reduction elongation rate control gain and the speed elongation rate control gain were set as subsequent conditions (then conditions). Calculate the rolling elongation rate control gain and the speed elongation rate control gain by fuzzy inference, generate a rolling elongation rate control signal from the elongation rate deviation and the rolling elongation rate control gain, and output to the rolling load control means, An elongation rate control method for a temper rolling mill, comprising: generating a speed elongation rate control signal from an elongation rate deviation and the speed elongation rate control gain and outputting the signal to the speed control means.