JPH0824949B2 - Line speed control method for continuous pickling and rolling equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for controlling a line speed of continuous equipment for pickling and rolling, and more particularly, to guiding a raw material from a first looper to a pickling equipment, and then to a second picker. The present invention relates to a line speed control method for continuous equipment which is guided to a rolling mill via a looper.

2. Description of the Related Art In general, the average speed of the material pickled from the first looper in the pickling equipment is often less than the average speed of the rolling mill, and the capacity in this case is determined by the pickling equipment. The average speed of the pickling equipment may be equal to the average speed of the rolling mill, and the average speed of the pickling equipment may exceed the average speed of the rolling mill. In each of these cases, it is desired that the continuous treatment can be efficiently performed without suppressing the maximum treatment capacity of the pickling equipment and the rolling mill.

Problem to be Solved by the Invention An object of the present invention is to provide a method for controlling the line speed of continuous equipment for pickling and rolling, which enables efficient and continuous treatment without suppressing the capabilities of the pickling equipment and rolling mill. Is to provide.

MEANS FOR SOLVING THE PROBLEMS The present invention provides a line speed prior to the introduction of raw materials in continuous pickling and rolling equipment in which a first looper, a pickling equipment, a second looper, and a rolling mill are provided in this order. In the line speed control method for determining, the first average speed VP1 of the material on the inlet side of the first looper, the second average speed VP2 of the material on the inlet side of the pickling equipment, and rolling with respect to the material thickness, material length and coil specifications. The relationship of the third average speed VM of the material on the inlet side of the machine is obtained in advance from the actual operation value, and the first average speed of each coil is calculated from the relationship based on the material thickness, material length and coil specifications of each coil. VP1, the second average speed VP2 and the third average speed VM are respectively obtained, and the smaller average speed of the first average speed VP1 and the second average speed VP2 is defined as the fourth average speed VP. Difference Δ between 4th average speed VP and 3rd average speed VM
(= VP-VM), and when the larger one of the times required for pickling and rolling is T, calculate ΔV · T to find the loop increase / decrease amount for each coil. The material whose increase / decrease amount is a predetermined value ΔL1 or more,
When a predetermined number n or more corresponding to the maximum loop amount of the second looper continues, the third average speed VM is set to a speed corresponding to the material thickness, and the fourth average speed of the coil continuous for the predetermined number n or more is maintained. A line speed control method for continuous pickling and rolling equipment, characterized in that VP is lowered and the fourth average speed VP is set to be substantially equal to the third average speed VM.

Further, the present invention is characterized in that the fourth average speed VP is corrected by the loop amount of the second looper and the pickling is operated at the optimum speed.

Further, according to the present invention, the loop increase / decrease amount is the predetermined value ΔL1.
When the number of coils is less than the predetermined number n, the fourth average speed VP is set to the maximum value of pickling, and the third average speed VM is set to a value corresponding to the fourth average speed VP. Is characterized by.

Further, according to the present invention, the loop increase / decrease amount is the predetermined value ΔL1.
When the number of coils is less than the predetermined number n, the fourth average speed VP is set to the maximum value of pickling, and the third average speed VM is set to a value corresponding to the fourth average speed VP, It is characterized in that the set value of the third average speed VM is corrected by the loop amount of the second looper to perform rolling at the optimum speed.

Action According to the present invention, the loop increase / decrease amount ΔV ·
Find T. Depending on the rolling condition, the number of coils whose loop increase / decrease amount is a predetermined value ΔL1 or more is n
The above may be continuous. At this time, the material may be stored in the second looper in an amount equal to or larger than the maximum looper amount of the second looper. Therefore, in the present invention, the third average speed VM, that is, the average speed of rolling is kept at a high speed corresponding to the material thickness while the fourth average speed VP is set.
That is, the average speed of pickling is reduced so that the average speed of pickling and the average speed of the rolling mill are approximately equal. Thus, the pickling and rolling of the raw material can be continuously carried out without stopping the raw material being pickled, while keeping the average pickling speed substantially constant. In the pickling equipment, it is not necessary to stop the material during pickling, so the quality can be improved.

At this time, the loop amount of the second looper is detected, and the pickling set speed is corrected based on the detected value. As a result, the loop amount of the second looper can be kept within a predetermined range, and smooth pickling and rolling continuous operation can be continued.

When the coil whose loop increase / decrease amount is equal to or greater than the predetermined value ΔL1 is less than the predetermined number n, the fourth average speed VP, that is, the average speed of pickling is set to the maximum value of pickling. Then, the third average speed, that is, the average speed of the rolling mill is set to a value corresponding to the average speed of pickling, for example, a value based on the actual results of pickling. In this way, pickling is made as high as possible and the average speed of rolling is selected accordingly as high as possible.

At this time, the loop amount of the second looper is detected, and the rolling set speed is corrected based on the detected value.

Embodiment FIG. 1 is an overall system diagram of an embodiment of the present invention.
The coiled material from the dispensing device 1 is the first on the pickling side.
It is supplied from the looper 2 to the pickling equipment 3 and pickled, and then stored in a second looper 6 composed of a pickling side looper 4 and a rolling entrance side looper 5, guided to a rolling mill 7, and rolled.
The rolled material is cut by the cutting device 8 and wound by the winding device 9. A trimmer 10 for trimming the edge of the raw material may be provided between the pickling side looper 4 and the rolling entrance side looper 5. In this case, it is assumed that stopping the trimmer does not affect the ability.

FIG. 2 is a graph showing the relationship of the average speed of pickling and rolling with respect to the coil material thickness or approximately the material length. At position 11 on the entry side of the first looper 2, the material is supplied before the time t1 and after the time t2, as shown in FIG. It is stopped for welding with the tip of the material to be processed, and during the period from time t1 to t2, the material is run and supplied. Therefore, the first average speed, which is the average speed at the entry side 11 of the first looper 2, is as indicated by reference numeral VP1.

At the position 12 on the inlet side of the pickling equipment 3, the speed of the material is changed as shown in FIG. 3 (2). In some cases, the tip or tail of the material coil has a constant speed. Therefore, the second average speed, which is the average speed in the pickling equipment 3, is as indicated by reference numeral VP2.

In the rolling mill 7, the material is changed as shown in FIG. Before time t5 and after time t6, the cutting means 8 cuts or changes the running gauge near the welding point of the material, so the speed is set to a small value of about 20 m / min to 60 m / min on the entry side. At times t5 to t6, rolling is performed at a speed suitable for the rolled plate thickness, or at the entrance side at about 150 to 300 m / min. Therefore, the third average speed, which is the entrance-side average speed of the rolling mill 7, is as indicated by reference numeral VM. Also, when changing the gauge within the material unit, there are two peaks.

Therefore, as shown by the line 1 in FIG. 2, the first average speed VP1 at the entry side position 11 of the first looper 2 becomes smaller as the material thickness becomes larger, that is, as the material length becomes shorter. . Further, at the position 12 on the inlet side of the pickling equipment 3, the second average speed VP2 decreases as the material thickness increases when the tip and tail ends are decelerated, as shown by the line l2. l2 intersects at material thickness W4. If there is no deceleration at the tip and tail ends, it becomes horizontal at a constant speed. The third average speed VM of the rolling mill 7 becomes a value corresponding to specifications such as material thickness and gauge change, as indicated by line l3. The lines l2 and l3 intersect at the material thickness W2.

The material loading operation will be described with reference to FIG. Moving from step r1 to step r2, the material thickness of each coil,
That is, based on the material length, the entry side position 11 of the first looper 2
The first average speed VP1 at is calculated from line 1 in FIG.

In step r3, the pickling equipment 3 is used based on the material thickness of each coil, that is, the material length or hot rolling temperature.
The second average speed VP2 at the position 12 on the entry side of is obtained from the line 12 in FIG.

In step r4, the first average speed VP1 at the entrance side position 11 of the first looper 2 and the second average speed VP2 at the entrance side position 12 of the pickling equipment 3 are compared, and the smaller value is calculated. It is defined as the 4th average speed VP.

As described above, the fourth average speed VP is such that the individual coils are positioned at the inlet side position 11 of the first looper 2 and the inlet side position 12 of the pickling equipment 3.
It represents the set value of the average speed when the vehicle continuously passes through. On the other hand, the first average speed VP1 and the second average speed VP1
The average speed VP2 represents the average speed at each of the positions 11 and 12, as described above. Therefore, the fourth average speed
VP represents the substantial average pickling speed of each coil (hereinafter, the fourth average speed VP may be referred to as the pickling average speed VP).

In Fig. 2, when the material thickness where lines 1 and 12 intersect is W4, and for material thicknesses W1 and W2 that are less than that value W4, the first average speed VP1 shown in line 1 is adopted as the pickling average speed VP. To do. When the material thickness is W4 or more, for example W3, the average speed VP2 indicated by the line 12 is adopted as the second pickling average speed VP. The average speed of the material at the entry side position 12 of the pickling equipment 3 is equal to the average speed of the material of the pickling equipment 3 at the center position in the traveling direction.

At step r5, the difference ΔV (= VP-VM) between the pickling average speed VP and the average speed VM of the rolling mill 7 is calculated and obtained.

In the next step r6, the loop increase / decrease amount ΔV · T for each material is calculated and obtained. Here, the value T is the longer one of the time T1 when one material passes through the pickling equipment 3 at the average pickling speed VP and the time T2 when it passes through the rolling mill 7 at the third average speed VM, that is, the average. This is the slower value. When L is the total length of the coil material, As a result, as shown in the following Table 1, material numbers 1 to 8
The loop increase / decrease amount ΔV · T is calculated for each time, and the list of Table 1 is made at step r7.

At step r8, it is assumed that the coil material is initially fed under the condition that only the connection standard is satisfied, and at step r9, the loop amount in the second looper 6 is calculated, and the second looper 6 is calculated.
The material feeding order is selected so that the loop amount in the looper 6 is less than the maximum loop amount allowed by the second looper 6. For example, as shown in Table 2, material numbers 1 to
When 8 is put in this order, the loop amount in the second looper 6 exceeds the maximum loop amount 500 m of the second looper 6 when processing the material of material number 6. Therefore, it is understood that the material numbers 1 to 8 cannot be input in this order as shown in Table 2. That is, the pickling line is forced to decelerate, and the capacity is reduced.

Therefore, as shown in Table 3, by selecting the material feeding order, the loop amount in the second looper 6 can be made less than the maximum loop amount of 500 m. Of course, the order of making them is within the range that satisfies the coil connection standard.

The loop amount shown in Table 3 is a theoretical loop amount as is clear from the above description, and when the loop amount becomes negative, the third average speed VM of the rolling mill 7 may be decelerated. .

The loop amount in the second looper 6 is the maximum loop amount 50.
If it becomes 0 m or more, the average speed VP of pickling in the pickling equipment 3 must be reduced. Since the pickling equipment 3 is the first step of the material, if the average speed of pickling here is low, the capacity of the rolling mill 7 cannot be further increased. Therefore, in the pickling equipment 3, it is desired to run the material at the maximum capacity speed, and the maximum capacity speed should be as constant as possible in terms of quality. According to the present invention, since the loop amount of the second looper 6 is less than the maximum loop amount, it is possible to maintain the maximum pickling ability and to keep the speed constant in the material coil. The quality can be improved.

By inputting the material thickness and specifications of each material of each coil from the input means 14 as shown in FIG. 1, the operation shown in FIG. 5 described above is achieved. The operation of the washing facility 3 and rolling mill 7 is controlled by the control circuit 15
It is carried out by.

Furthermore, according to the present invention, the capacity categories 1, 2, and 3 are set in advance for each coil material to be charged, as shown in Table 4.

Here, for example, the material capacity classification 1 is VP> VM, which is the loop increase / decrease amount ΔV · T ≧ ΔL1. ΔL1 is, for example, 30 m. -.DELTA.L2 in Table 4 is, for example, -30 m. When a large number of materials of capacity category 1 are continuously charged, the loop amount of the second looper 6 excessively increases, and the pickling equipment 3 has to be stopped halfway. In order to solve this problem, the control circuit 15 performs the operation shown in FIG.

Step s1 is shifted to step s2, and it is determined which one of the ability categories 1, 2 and 3 shown in Table 4 each coil belongs to.

At step s3, it is determined whether the number of materials belonging to the coil material capacity category 1 continues for a predetermined number n. This predetermined number n is a value corresponding to the maximum loop amount of the second looper 6, and when this number n or more continues, the loop amount may increase beyond the maximum loop amount of the second looper 6. Therefore, when it is necessary to continuously process the material of such capability classification 1 by the predetermined number n or more, in step s4, the third average speed VM of the rolling mill 7 is as large as possible corresponding to the material thickness. The rolling speed remains fixed, so rolling is performed at a relatively high speed. The average speed VP in the pickling equipment 3 is such that when the first material out of the above-mentioned materials n or more continues into the pickling equipment 3, for example, the tip of the first material is the center of the pickling equipment 3 in the material running direction. When the position is reached, the pickling average speed VP is the third of the rolling mill 7.
Reduce it so that it is approximately equal to the average speed VM. The average pickling speed resulting from this reduction is the set value VBC set in advance in the control circuit 15 and the actual speed in the rolling mill 7
Selected from ▼ and. The actual speed ▲ ▼ is an actual average value of the third average speed VM for each material when a plurality of predetermined materials are rolled by the rolling mill 7. These preset set values VBC and the actual speed ▲
The larger value of ▼ is set as described above for pickling, and the last material of the predetermined number n is
The set speed is maintained until the pickling equipment 3 comes to the center position in the traveling direction. However, if the VM changes, the setting speed also changes.

In step s5, the pickling set speed is corrected by the loop amount of the second looper 6. The second looper 6 is provided with detection means 15 for detecting the loop amount. The loop amount detecting means 15 can detect the loop amount based on, for example, the displacement position of the carriage that supports the roller that stretches the material. If the loop amount of the second looper 6, that is, the loop amount in response to the output of the loop amount detecting means 15, is large, the average speed VP of pickling is decreased. Increase the average speed VP. In this way, continuous operation becomes possible while maintaining the average speed of the rolling mill 7 at a large value corresponding to the material thickness.

The number of materials having the material capability classification 1 is the predetermined number n
Less than, when continuously input, in step s6,
The average speed VP of pickling is as large as possible suitable for pickling,
That is, the above-mentioned second corresponding to the material thickness and specifications of the material.
Keep the lower value of lines 1 and 12 in the figure, that is, the maximum speed in pickling. The third average speed VM of the rolling mill 7 is obtained by averaging the values of the above-mentioned average value speed VP of pickling determined for each of a plurality of raw materials according to the actual results of pickling, and rolling the value equal to the average value ▲ ▼. It is set to the third average speed VM of.

In step s7, the third average speed VM of the rolling mill 7 is adjusted by the loop amount in step s6 described above. That is, when the loop amount detected by the loop amount detecting means 5 of the second looper 6 is large, the average speed of the rolling mill 7 is increased,
If the loop amount is small, the average speed of the rolling mill is reduced. In this way, it is possible to prevent the loop amount in the second looper 6 from being excessively large or excessively small, thereby enabling stable operation of the pickling line and the rolling mill.

In step s8, the loop amount of the second looper 6 is predetermined when the above-mentioned step S4 is executed in order to prevent the material from stopping at the central position in the traveling direction of the material in the pickling equipment 3. When the value exceeds the value, the average pickling speed is reduced by a predetermined value αm / min. As a result, the loop amount in the second looper 6 is reduced, and thus it is possible to avoid a situation in which the traveling of the raw material in the pickling equipment 3 must be stopped.

In step s9, when the loop amount of the second looper 6 exceeds a predetermined value in a state where the above-mentioned step s4 is not executed, the average pickling speed is set to a predetermined value βm /
Decelerate by a minute. In this way, if the loop amount of the second looper 6 has to be reduced to stop the traveling of the raw material in the pickling equipment 3, it is possible to avoid a situation in which the pickling and rolling can be continuously performed. It will be possible.

EFFECTS OF THE INVENTION As described above, according to the present invention, the loop increase / decrease amount is obtained for each coil, and the ability of the pickling equipment and the rolling mill is mutually canceled by controlling the loop amount based on the loop increase / decrease amount. By suppressing it, it becomes possible to efficiently continue the pickling and continuous operation of the rolling mill.

[Brief description of drawings]

FIG. 1 is an overall system diagram of an embodiment of the present invention, FIG. 2 is a graph showing the relationship between the thickness of the material and the average speed of pickling and rolling, and FIG. 3 is a graph showing the average speed of pickling. FIG. 4 is a diagram for explaining an average rolling speed, FIG.
FIG. 6 is a flow chart for explaining the operation for determining the feeding order of the raw materials, and FIG. 6 is a flow chart for explaining the operation for determining the average speed of pickling and the average speed of the rolling mill. 1 ... Material, 2 ... 1st looper, 3 ... Pickling equipment, 6 ... 2nd looper, 7 ... Rolling machine, 8 ... Cutting means, 9 ... Winding device, 10 ...
Trimmer, 14 ... Input means, 15 ... Control circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B21B 41/00 B C23G 3/02

Claims (4)

[Claims] 1. A line speed control for determining a line speed prior to material input of a continuous pickling and rolling facility in which a first looper, a pickling facility, a second looper and a rolling mill are provided in this order. In the method, the first average speed VP1 of the material on the inlet side of the first looper, the second average speed VP2 of the material on the inlet side of the pickling equipment, and the material on the inlet side of the rolling mill with respect to the material thickness, material length and coil specifications. The third
The relationship of the average speed VM is obtained in advance from the actual operation value, and the first average speed VP1 and the second speed of each coil are calculated from the relationship based on the material thickness, material length and coil specifications of each coil.
The average speed VP2 and the third average speed VM are respectively calculated, and the smaller average speed of the first average speed VP1 and the second average speed VP2 is defined as the fourth average speed VP, and the fourth average speed of each coil is determined. Difference between VP and 3rd average speed VM ΔV
(= VP-VM), and when the larger one of the times required for pickling and rolling is T, calculate ΔV · T to find the loop increase / decrease amount for each coil. When the material whose increase / decrease amount is a predetermined value ΔL1 or more continues for a predetermined number n or more corresponding to the maximum loop amount of the second looper, the third average speed VM is set to the speed corresponding to the material thickness, and The fourth average speed VP of the coils that are continuous for a predetermined number n or more is decreased, and the fourth average speed VP becomes the third
A line speed control method for continuous pickling and rolling equipment, characterized in that the speed is set to be approximately equal to the average speed VM. 2. The pickling and rolling according to claim 1, wherein the fourth average speed VP is corrected by the loop amount of the second looper and the pickling is operated at an optimum speed. Line speed control method for continuous equipment. 3. When the number of coils whose loop increase / decrease amount is the predetermined value ΔL1 or more is less than the predetermined number n,
The 4th average speed VP is set to the maximum value of pickling, and the 3rd average speed VM
Is set to a value corresponding to the fourth average speed VP, The line speed control method for continuous pickling and rolling equipment according to claim 1, wherein 4. When the number of coils whose loop increase / decrease amount is the predetermined value ΔL1 or more is less than the predetermined number n,
The 4th average speed VP is set to the maximum value of pickling, and the 3rd average speed VM
Is set to a value corresponding to the fourth average speed VP, the loop amount of the second looper corrects the set value of the third average speed VM, and rolling is performed at the optimum speed. 5. A method for controlling the line speed of continuous equipment for pickling and rolling according to item 1.