JPH02290612A - Stock throw-in sequence determining method for continuous equipment of pickling and rolling - Google Patents

Abstract

PURPOSE:To prevent the capacity of both equipments from being cancelled each other by deriving the loop increase/decrease quantity from a difference of a pickling average speed and a rolling average speed, and selecting and throwing in a coil so that its accumulation quantity becomes less than the maximum loop quantity of a second looper. CONSTITUTION:A smaller one of a stock average speed of a first looper 2 and an average speed of a pickling equipment 3 is set as a pickling average speed. Subsequently, a difference V of the pickling average speed and a rolling average speed is derived, and in the time required for pickling and rolling, a larger time is set as T. By calculating .T, the loop increase/decrease quantity is derived at every coil, and a coil 1 is selected and thrown in so that the loop quantity at the time of throwing in continuously becomes less than the maximum loop quantity of a second looper 4. In such a way, the continuous processing of pickling and rolling can be executed continuously and efficiently without canceling the capacity of the pickling equipment and a rolling mill.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for determining the order of feeding materials into continuous equipment for pickling and rolling. The present invention relates to a method for determining the order in which materials are introduced into a continuous facility in which materials are introduced into a rolling mill via a second looper.

BACKGROUND OF THE INVENTION Generally, the average speed of the material being pickled from the first looper to 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. There are also cases where the average speed of the pickling equipment and the average speed of the rolling mill are equal, and furthermore, there are cases where the average speed of the pickling equipment exceeds the average speed of the rolling mill. In each of these cases, without restricting the maximum throughput of the pickling equipment and rolling mill,
It is desired that continuous processing can be carried out efficiently.

Problems to be Solved by the Invention An object of the present invention is to provide a method for determining the order of material input for continuous pickling and rolling equipment, which allows efficient continuous processing without restricting the capacity of the pickling equipment and rolling mill. The goal is to provide the following.

Means for Solving the Problems The present invention provides a first looper, a pickling equipment, a second looper,
In the method for determining the material feeding order of a continuous pickling and rolling facility in which a rolling mill is installed in this order, the smaller of the average speed of the material at the entrance side of the first looper P1 and the average speed VP2 of the pickling section is determined. The pickling average speed VP is adopted as the difference ΔV between the pickling average speed VP and the rolling entry side average speed VM.
(=VP-VM), and when the larger time is T among the times required for pickling and rolling, ΔV
・Calculate T to find the loop increase/decrease, and select and feed the coils so that the loop amount during continuous feeding is less than the maximum loop amount of the second looper. This is a method for determining the order of material input for continuous equipment.

Function According to the present invention, the loop increase/decrease ratio △■・T of each material is determined, and the coil is selected and inserted so that the loop amount is less than the maximum loop amount of the second looper when the material is continuously processed iQ. As a result, the loop amount does not increase beyond the maximum loop amount in the second looper, and moreover, the pickling process (
The continuous processing of pickling and rolling can be carried out efficiently without suppressing the average speed of a and the rolling mill, that is, without suppressing the ability of the pickling side.

Embodiment No. 111] is an overall system diagram of an example of the present invention. The coiled material from the unloading device 1 is supplied from the first looper 2 on the pickling entry side to the pickling equipment 3 where it is pickled. 2 is stored in the looper 6, guided to the rolling mill 7 and rolled,
The rolled material is cut by a cutting device 8 and wound up by a winding device. A trimmer 10 for trimming the edge of the material may be provided between the pickling exit looper 4 and the rolling entry looper 5. In this case, it is assumed that stopping the trimmer does not affect performance.

FIG. 2 is a graph showing the relationship between the average speed of pickling and rolling, which corresponds to the material thickness or approximately the material length of the coil. At position 11 on the entry side of the first looper 2, the material is
As shown in 1), before time t1 and after time t2, welding is stopped to weld the tail end of the material being supplied first and the tip of the material to be supplied next, and from time t1 to
During the period t2, the material is run and fed.

The average speed at the inlet side 11 of the first looper 2 is therefore as indicated by the reference VPI.

At the entry side position 12 of the pickling equipment 3, the speed of the material is changed as shown in Figure 3 (2).Also, there is a constant speed of 4.6 from the tip to the tail end of the material coil. The average speed in this pickling equipment 3 is as indicated by the mark VP2.

At rolling V%7, the material is transformed 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 20 m/m on the entry side.
In is set to a small value of about 60 m/min, and from time t5 to t6, rolling is performed at a speed suitable for the thickness of the rolled plate, or about 150 to 300 m/min on the entry side. The average speed at the entrance of the rolling mill 7 is therefore indicated by the reference VM. Also, when changing the gauge within a material unit, there will be two peaks.

Therefore, as shown by line r1 in FIG.
The average speed VPI at the input side position 11 of the looper 2 becomes smaller as the material thickness increases, that is, as the material length becomes shorter. Moreover, at the entry side position 12 of the pickling equipment 3, as shown by the line 12, the average speed VP2 decreases as the material thickness increases when decelerating the tip and tail ends, and these lines e1
．． 12 intersect at material thickness W4. If there is no deceleration at the tip or tail, it becomes horizontal at a constant speed. As shown by line 13, the average speed VM of the rolling mill 7 has a value that generally corresponds to specifications such as material thickness and gauge change. line i'
2 and l3 intersect at material thickness W2.

The material loading operation will be explained with reference to FIG.

Moving from step r1 to step r2, the average speed VPI shown by line l1 in FIG. 2 at position t 11 on the inlet side of the first looper 2 is selected depending on the material thickness of the coil, that is, the material length.

In step r3, the average speed VP2 at the position 12 on the entry side of the pickling equipment 3 is set at the line 12 in FIG.
Decide as shown in .

In step r4, the average velocity VPI at the inlet side position 11 of the first looper 2 and the pickling installation {inlet side position 1 of the basin 3
2, and the smaller value is adopted as the average pickling speed ■P.

In Figure 2, the material thickness where lines l1 and 12 intersect is W
4, for material thicknesses Wl, W2, etc. less than the value W4, the average speed VPI shown by line l1 is adopted as the pickling average speed ■P.

Further, when the material thickness is W4 or more, for example, W3, the average speed VP2 shown by line 12 is adopted as the pickling average speed ■P. The average speed of the material at the entrance position 12 of the pickling equipment 3 is equal to the average speed at the center position of the material in the pickling equipment 3 in the running direction.

In step r5, the difference Δv (1 vp−vM) between the pickling average speed VP and the average speed VM in the rolling mill 7 is calculated and determined.

In the next step r6, the loop increase %Q MΔV・
Calculate and find T. Here, the value T is the longer of the time T1 during which one material passes through the pickling average speed VP and the time T2 during which one material passes through the rolling mill 7 at an average speed VM, that is, the one shift with the slower average speed. It is. When L is the total length of the coil material, as shown in the following Table 1, the loop increase/decrease is the loop increase/decrease ΔV・T for each material number 1 to 8.
is calculated, and a list of Table 1 is created in step r7.

1. For example, as shown in Table 2, when material numbers 1 to 8 are input in this order, the loop amount in the second looper 6 is the maximum loop Jt500m of the second looper 6, which is equal to the material number 6. exceeds the limit when processing. Therefore, it is understood that material numbers 1 to 8 cannot be added in this order as shown in Table 2.

In other words, the pickling line is forced to slow down, reducing capacity.

In step r8 of Table 2, it is assumed that the coil material is initially introduced under conditions that only the connection criteria are satisfied, and in step r9, the loop amount in the second looper 6 is calculated, and the loop amount in the second looper 6 is calculated. , the order in which the materials are introduced is selected so that the loop amount is less than the maximum loop amount allowed by the second looper 6. Therefore, as shown in Table 3, by selecting the order in which the materials are introduced, the loop amount in the second looper 6 can be made less than the maximum loop M 500 m. Of course, the order of application should be within a range that satisfies the coil connection standards.

Table 3 Note that when the loop amount becomes negative in Table 3, the average speed VM of the rolling mill 7 should be reduced. The loop amount in the second looper 6 is the maximum loop amount 50
If the distance exceeds 0 m, the average pickling speed VP of the pickling equipment 3 must be reduced. Since the pickling equipment 3 is the first process for the material, if the average pickling speed here is low, the capacity of the rolling mill 7 cannot be increased any further. Therefore, in the pickling equipment 3, it is desirable to run the material at the maximum speed possible, and from the viewpoint of quality, it is better to keep the maximum speed as constant as possible.
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 capacity and keep the speed constant within the material coil, thereby reducing crystallization. It is possible to improve this.

As shown in FIG. 1, by inputting the material thickness and specifications for each material of each coil from the input means 14, the operation shown in FIG. The operation of the rolling mill 7 etc. is controlled by the control circuit 15.
This is done by Effects of the Invention As described above, according to the present invention, it becomes possible to efficiently carry out the continuous processing of pickling and rolling without sacrificing the capacity of the pickling equipment and rolling mill.

[Brief explanation of the drawing]

Fig. 1 is an overall system diagram of an embodiment of the present invention, Fig. 2 is a graph showing the relationship between the average speed of pickling and rolling with respect to the thickness of the material, and Fig. 3 explains the average speed of pickling. FIG. 4 is a diagram for explaining the average speed of rolling, and FIG. 5 is a flowchart for explaining the operation for determining the order in which materials are introduced. DESCRIPTION OF SYMBOLS 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 agent Patent attorney Keiichiro Nishikyo Figure 3 Time Time

Claims (1)

[Scope of Claims] In a method for determining the order of material input in continuous pickling and rolling equipment in which a first looper, a pickling facility, a second looper, and a rolling mill are provided in this order, The smaller of the average speed VP1 of the side material and the average speed VP2 of the pickling section is adopted as the pickling average speed VP, and the difference ΔV between this pickling average speed VP and the rolling entry side average speed VM is
(=VP-VM), and when the larger time is T among the times required for pickling and rolling, ΔV・
Continuous pickling and rolling characterized by calculating the loop increase/decrease by calculating T, and selecting and feeding coils so that the loop amount during continuous feeding is less than the maximum loop amount of the second looper. How to determine the order in which materials are introduced into equipment.