JPH0824946B2 - Method for controlling extraction pitch of processed members - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for controlling the extraction pitch of a processed member,
In particular, the present invention relates to a method for determining the extraction pitch of rolled material on a conveyor line that enhances rolling efficiency on the conveyor line.

[Prior Art] As a conventional device of this type, for example, Japanese Patent Application Laid-Open No. 55-97808
Since it is proposed in Japanese Patent Laid-Open Publication No. Gazette, this will be described with reference to FIGS. 4, 5, and 6. FIG. 5 is a conceptual diagram showing an example of a transfer line of a hot rolling mill (hot spring mill). (1a), (1b), (1c), (1d) and (1e) are in the transfer line (2). Rolled material flowing through each processing step, (3)
Is a heating furnace comprising first to fourth heating furnaces (3a) to (3d), (4) is an edger for removing oxides adhering to the surface of the rolled material (1a), and the edger (4) is a heating furnace ( It is arranged on the downstream side of 3). (5), (6),
(7) and (8) are first to fourth rough rolling mills for sequentially rough rolling the rolled material (1b) processed by the edger (4), and (9) is flowed down to the fourth rough rolling mill (8). Rolled material (1
Crop shear, which cuts irregularities generated at the tip and tail of c), (10), (11), (12), (13), (14),
(15) is a first to sixth finishing rolling machine for finishing rolling a rough rolled material whose tip and tail are trimmed by a crop shear (9), (16) is a finished rolled rolled material (1e) It is a winder that winds up.

However, the rolled material in each processing step of the transfer line (2) having the above configuration is first intermittently extracted from the heating furnace (3). FIG. 4 is a block diagram showing a control system of a conventional extraction pitch control device for controlling the extraction timing of this rolled material. In Figure 4, (21) is
Roughness, finish rolling mill setting calculation function, rolling schedule for rolling material to be extracted from the heating furnace (3) based on the plant constant table (this is referred to as "subsequent material"),
The pacing scheduler (22) is a setter for setting the speed, acceleration / deceleration rate, etc. of the transfer equipment in the pacing scheduler (22). The transport time of the tail end Y of the rolled material extracted immediately before the material (referred to as "predecessor material") is predicted. That is, as shown in FIG.
Extraction-Edger (4), Edger (4) -Rough first rolling mill (5), between rough rolling mills, rough final rolling mill (8) -Crop shear (9), Crop shear (9) -Finishing first rolling Mill (10), Finishing First Rolling Mill (10) to Finishing Final Rolling Mill (1
5) Predict the transport time required to pass through each process from the finishing final rolling mill (15) to the winder (16) by calculating the transport schedule to each facility by setting each in the pacing scheduler (22). To do. The points used as the basis for these calculations are the processing equipment and the winder (16) for the transfer line (2) in advance.
It is installed in equipment that operates.

(23) is a constraint condition setter that sets the gap time and clearance time that are constraint conditions. Here, the gap time refers to a time interval required from the passage of the tail end Y of the preceding material to the arrival of the tip X of the succeeding material at a certain point on the transport line (2). The clearance time is a time conversion of the clearance, which is the distance between the tail end Y of the preceding material and the tip X of the succeeding material at a certain point on the transport line (2). These reference points are, as described above, the edger (4), the rough rolling mills (5) to (8), the crop shear (9), the finish rolling mill (10) to which are present in the transfer line (2). It is provided in equipment such as (15) and the winder (16). In other words, it is provided in the equipment having a position sensor, that is, provided in the transfer line (2) and the position is inevitably determined. Further, either the gap time or the clearance time can be used as the constraint condition, but these are selected depending on the processing equipment or the like existing in the transfer line (2). For example, in the finishing first rolling mill (10), the gap time is often used as a constraint condition. The gap time and clearance time ΔTG _i , which are these constraints, are set for a plurality of points on the transport line (2) to determine the optimum extraction pitch.

(24) is an optimum extraction pitch determiner, which will be described with reference to FIG. 6 which is a diagram showing the relationship between the positions of the succeeding material and the preceding material on the transport line (2) and time. Pacing scheduler (22)
The transport time TQ _{i to} the point Q _i (the same position as P _i ) of the trailing edge Y of the preceding material and the point P of the leading edge X of the following material calculated in
a transfer time TP _i to _i, determining the minimum of the extracted pitch P _I T _i that satisfies the gap time or clearance time? tg _i at each point in the conveying line (2) set in the constraint condition setting unit (23), these Extraction P _{I at} each point of
By taking the maximum value of T _i, the minimum extraction pitch satisfying all the constraint conditions, that is, the optimum extraction pitch is obtained.

[Problems to be Solved by the Invention] Since the conventional extraction pitch control method is configured as described above, there are the following problems.

(1). The transport line is a facility equipped with a plurality of winders, and when only a single first winder is used and continuous winding is not performed, the constraint conditions relating to the winder (16) Is less than the case of winding by a single machine. For example, when the first winding machine is used alone, after the rolled material is completely wound by the first winding machine, the product coil is removed and the next rolled material is prepared for winding. On the other hand, when two first winding machines and two second winding machines are used, the first winding is performed during the rolling of the rolled material by the second winding machine after the rolling of the rolled material by the first winding machine is completed. It is possible to remove the product coil of the take-up machine and prepare for winding the next rolled material.

At this time, it is necessary to consider the preparation time from the completion of winding by the first winding machine to the preparation for winding. In other words, as a constraint condition, not only the relationship between the succeeding material and the preceding material, but in this case, the relationship between the rolled material and the succeeding material extracted on the transport line two times before the succeeding material must be considered. It was hard to say that the pitch control method was sufficient.

(2). In the conventional extraction method, as described above, the prediction of the transportation time of the rolled material is performed as the transportation time that satisfies the constraint condition with reference to the same point on the transportation line that considers the constraint condition. At this time, the constraint condition is a table control using a local sequencer realized by direct digital control (DDC). An entry condition control (for example, when entering a rolling mill, consider the time to change the setting of the rolling mill. ), Oscillation control (for example, when the rolled material comes too fast in front of the rolling mill, reciprocating in front of the rolling mill until the rolling mill can be set), and emergency stop control are considered. Regardless of this DDC check, it is necessary to determine the extraction pitch at which the rolled material is transported smoothly. The point to check in this DDC is the same position for the preceding material and the succeeding material, so when performing a smooth control with a short extraction pitch, the positional relationship between the preceding material and the succeeding material at the point position May cause problems. From these, it is difficult to say that the conventional extraction pitch control method is sufficient when considering an accurate transfer schedule.

The present invention has been made to solve the above-mentioned problems, and takes into consideration the constraint conditions on the transportation of rolled material existing in various forms at various points in the transportation line. Moreover, it is an object of the present invention to provide an extraction pitch control method capable of determining an accurate extraction pitch with maximum rolling efficiency even in a facility where a plurality of winders are operating.

[Means for Solving the Problem] In the extraction pitch control method according to the present invention, the arrival time at which the tail end of the preceding material reaches the first point and the second time upstream of the first point of the transport line The arrival time at which the tip of the succeeding material reaches the point and the first and second points as a set are required between the tail end of the preceding material at the first point and the tip of the succeeding material at the second point. The extraction pitch of the subsequent material is calculated from the constraint condition by calculation.

[Operation] According to the extraction pitch control method of the present invention, there is a predetermined distance interval between the first and second points, and there is a spatial margin between the tail end of the preceding material and the tip end of the succeeding material. .

[Example] In the following examples, a rolling line (2) is used as a conveying line, a rolled material is used as a processing member, and a rolled material to be extracted immediately after the preceding material on the rolling line (2) is used as a succeeding material and a succeeding material. The leading end is X, the rolled material already extracted on the rolling line (2) is the leading material, the tail end of the leading material is Y, and the rolled material extracted immediately before the trailing material among the leading materials is the first leading material, Of the preceding materials, the rolled material extracted immediately before the first preceding material is the second preceding material, the extraction start time of each rolled material as the reference time, and the time at which each rolled material is conveyed from the extraction start position to the point. The arrival time, Q _i as the first point, P _i as the second point, and a plurality of (two) winders as the equipment for working alternately will be described as an example.

The present invention will be described with reference to FIG. 1 showing the block configuration of the extraction pitch control method. In FIG. 1, (31) is a roughing machine by a setter (34), a finishing rolling mill setting calculation function, a rolling schedule for succeeding materials based on a plant constant table, a speed of conveyance equipment, an acceleration / deceleration rate, and a winding machine (16). ) Setting calculation value etc., the position, speed and acceleration of the trailing edge Y of the preceding material and the leading edge X of the succeeding material and the transport time from the start of extraction to the completion of winding are set as a reference. A transport scheduler for calculating, (32) a transport schedule storage unit for sequentially storing the transport schedule for each rolled material by inputting the calculation result of the transport scheduler (31), (33) each calculation result of the transport scheduler (31), each stored value of the transfer schedule storage unit (32), and from the set constraints constraint condition setting unit (35), the tail end Y of the preceding material to the first point Q _i to be a reference for determining the constraint condition, the Arrival required time calculator tip X of the subsequent material to the point P _i of calculating the time to reach each of (36) from the extracted pitch calculated for each set of each point, determine the optimum extraction pitch of the subsequent material That is, it is an optimum extraction pitch determiner that selects the maximum one from the calculated extraction pitches. The optimum extraction pitch obtained here is the minimum extraction pitch of the succeeding material.

The transportation schedule of the subsequent material on the rolling line (2) is calculated by calculating the transportation time from the start of extraction to the completion of winding based on the position, speed, acceleration of the leading edge X of the subsequent material and the start of extraction. . This calculation is performed sequentially by adding a new block each time the acceleration or the plate thickness changes, with a block having a constant acceleration and plate thickness of the tip X of the succeeding material as one block. In addition, the same calculation is performed for the tail end Y of the preceding material. Here, the position at the block start point,
The velocity, acceleration, and the arrival time from the extraction start position are calculated. For example, the first block is from the start of extraction to the start of conveyance after the completion of extraction, and the succeeding material at the block start position has the tip X at the extraction position on the rolling line (2) and the speed of the tip X. Is 0, the acceleration of the tip X is also O (constant), and the time from the start of extraction is O because the extraction start time is the reference time. After that, calculation is performed according to the set value by the setter (34) until the winding is completed. The transfer schedule for the rolled material calculated as described above is stored in the transfer schedule storage device (32).

Next, the constraint condition setter (35) sets constraint conditions that should be satisfied between the succeeding material and the preceding material. For example, the setting of the rolling roll interval for controlling the plate thickness differs depending on the material of the rolled material and the target value of the plate thickness. When the tail end Y of the first preceding material comes out of the rolling mill and the rolling of the succeeding material is started, it is necessary to change the setting of the rolling roll interval. If the succeeding material bites into the rolling roll before the preparation time required for this setting change elapses, the succeeding material will not be rolled to the target plate thickness. It is necessary to have it between the tail end Y and the tip X of the succeeding material. This condition is determined by the entry condition, the oscillation condition, the rolling condition, etc. at the point of the DDC transfer sequence control in the two rolled materials. Further, as will be described later, when two winders operate, it is necessary to consider the constraint condition that should be established between the second preceding material and the subsequent material. In other words, the constraint condition is that the trailing edge Y of the preceding material passes through the point Q _i and then the leading edge X of the succeeding material becomes the point.
It is the minimum required time ΔTG _i before passing through P _i , and this is called margin time.

Here, the point is set at a position such as a position sensor provided on the rolling line (2) (position required for rolling mill, winder, DDC transfer sequence control, position required for oscillation control, etc.). Each point is uniquely determined if the rolling line (2) and rolling conditions are determined.
In other words, it is also determined which point exists in which block. And since one or more points are set for each block with equipment,
Based on P _i and point Q _i , the constraint conditions for entering each facility are selected and selected for all blocks with facilities as described above.

In the coarse first stand (5), points Q _i and points in the block including the coarse first stand (5)
2 consecutive points P _i upstream from Q _i by a certain distance
Taking two rolled materials (succeeding material and first leading material) as an example, when the tail end Y of the first leading material is at the point Q _i after passing through the rough first stand (5), the leading edge X of the succeeding material is Is to be located at a point P _i on the upstream side of the coarse first stand (5) by a certain distance. Such points P _i always exist in the rolling line (2) and are uniquely determined when the equipment position of the rolling line (2) is determined as described above.

In the set of points P _i and Q _{i that} are the basis of the constraint conditions set by the constraint condition setter (35), the tail end Y of the first preceding material is
Takes the arrival time TQ _i required to reach the point Q _i with reference to the time of extracting the first preceding material, and the arrival time TQ _i of the subsequent material with respect to the time of extracting the subsequent material to the point P _i. The arrival required time calculator (33) calculates the arrival time TP _i .

Here, the points regarding the method of obtaining the extracted pitch P _I T _i
A description will be given based on FIG. 2 showing the relationship between the position and time on the rolling line of two rolled materials (subsequent material and first preceding material) in the set of P _i and Q _i . As is clear from Figure 2, points P _i, the extraction pitch of the succeeding material in the set of Q _i P _I T _i, points P _i,? Tg constraints in the set of Q _{i i,} the first preceding material arrival time tail end Y reaches the point Q _i of the TQ _i,
The arrival time tip X of the following material reaches the point P _i TP _{i
If, P I T i + TP i} = TQ i + ΔTG i ... (1) , and the constraints? Tg _i, as described above, arrival time T
Since Q _i and arrival time TP _i are obtained as described below, the extraction pitch P _I T _i can be obtained.

Now, the calculation of the time (arrival time TP _i ) when the tip X of the succeeding material passes the point P _i will be described as an example. When the position of the point P _i on the rolling line (2) is XP _i , the transfer schedule of the two rolled materials determined by the constraint conditions is read from the transfer schedule storage (32), and the block k including this position XP _i is read. Take out. That is, when the position of the block start point in the k-th block is XH _k , the block k to be obtained is a block of XH _k ≤XP ₁ <XH _{k + 1} (2). At this time, when the formula (2) such as the reversible rolling of the rough rolling mill is established in a plurality of blocks for a certain point set P _i , Q _i , for example, a final last pass is obtained by searching from the smaller k. Find out.

Incidentally, in the case of this embodiment, the position XH _k on the rolling line of the start point of the block k (2), the speed of the tip X of the subsequent material, acceleration, and the tip X of subsequent material to the start of the block k The arrival time T _{k of} is given by the transfer schedule (31). Velocity and acceleration of the tip X of the following material at the point P _i in this block k, and arrival time to the point P _i
TP _i is not given, and parameters at the starting point of block k (position XH _k on the rolling line (2) at the starting point of block k, velocity of leading edge X of succeeding material, acceleration, and start of block k) It is necessary to obtain it based on the arrival time T _k of the tip X of the succeeding material to the point. Here, since the acceleration is constant in the block k, the arrival time Δt from the starting point of the block k to the point P _i can be easily obtained by the parameter at the starting point of the block k. From this arrival time Δt and the arrival time T _k from the time of extraction to the start point of block k,
Arrival time TP _i to the point P _i is calculated as _{TP i = T k + Δt ...} (3).

Since the arrival time T _i is obtained by the transfer scheduler (31), how to obtain the arrival time Δt from the starting point of the block k to the point P _i will be described.

On the other hand, as a basic equation of the equation of motion, there is L = V _S + (1/2) at ² (a).

Here, V _S is initial velocity, a is acceleration, t is time, and L is distance.

Then, if a quadratic equation is solved for the above equation (a) for t, Becomes

Therefore, when the block number k is calculated by the above-mentioned calculation of the transfer scheduler (31), since each block k has a uniform acceleration motion, the tip speed VH _k at the start point of the block k and the start of the block k are started. Tip acceleration a at a point
H _k , the distance from the starting point of block k to point P _i (XP _i
-XH _k ) and applying the above equation (a ′), The arrival time Δt from the starting point of the block k to the point P _i can be calculated by the equation In Eq. (4), the sign before and after the radical is VH _k > O or (VH _k = 0 and AH _k > O), and is added (+), and VH _k <O or (VH _k = 0 and AH _{When k} > O), subtraction (-) is performed.

Note that when AH _k = O, it is a uniform motion L = Δt × VH _k (b) Here, L is the distance from the start point of block k to point P _i , and L = XP _i − Since it is XH _k , Can be used to determine the arrival time Δt from the start of block k to point P _i .

In equations (4) and (4 '), the velocity V
H _k, acceleration AH _k is the direction of the acceleration reactor (3) wound from winding machines (16) as positive.

Thus, from the starting point of block k to point P _i
Since the arrival time up to is calculated as Δt from the above equation (4) or equation (4 ′), it is possible to obtain the arrival time TP _{i at} which the tip X of the subsequent material reaches the point P _i from the time of extracting the subsequent material. it can.

As described above, the point P _i that becomes the reference for setting the constraint conditions
When the required time TP _{i for} the leading edge X of the succeeding material to reach the point T _i and the required time TQ _i for the trailing edge Y of the preceding material to reach the point Q _i are calculated in the same manner as in the prior art, The determiner (36) obtains the optimum extraction pitch as follows.

Of the n constraint conditions that consider the entry conditions, etc., for each facility in the rolling line (2), the i-th constraint condition is that the margin time ΔTG is reached after the tail edge Y of the preceding material passes the point Q _{i. i}
After the above, the tip X of the succeeding material must pass the point P _i . In other words, for each constraint,
P _i, for each set of Q _i, the minimum extracted pitch P _I T _i satisfying this,
It can be obtained by the equation (1).

Here, the n extracted pitches obtained in the set of n sets of points P _i and Q _i are (P _I T ₁ , P _I T ₂ , P _I T ₃ , ..., P
The maximum value of _I T _i , ..., P _I T _n ) is the maximum value at all points P _i , Q.
Since the extracted pitch P _I T _OPT satisfying the set for constraints _i (5) expression is derived.

here, And max (P _I T ₁ , P _I T ₂ , P _I T ₃ , ..., P _I T _i , ..., P
_I T _n ), which corresponds to finding the maximum value of n P _I T _i ,.

As described above, since the positions of the points P _i and Q _i are different, there is a certain distance between the points P _i and Q _i , and the rolling material controlled by the transportation schedule is out of the transportation schedule. At this time, for example, even when the two rolled materials are too close to each other, this distance interval and the following material are checked at a point in advance. It is possible to prevent entry into equipment and excessive oscillation. Therefore, smooth and efficient rolling control becomes possible.

The control method of obtaining the point by the tail end Y of the first preceding material as Q _i and the tip X of the succeeding material as the constraint condition (margin time) at the time of passing P _i has been described. A method of calculating as a constraint condition (so-called gap time and clearance time) by converting the trailing edge Y of the material when passing the point Q _i and the leading edge X of the succeeding material from when passing the point P _i to when passing the point Q _i. May be

Next, a case where the two winders, the first winder and the second winder, are alternately operating will be described. Points P _i , Q _i
Of a third graph showing the relationship between the position and time on the rolling line of two rolling material (subsequent material and the second preceding material) based on the set point P _i as described above, two in the set of Q _i Description will be made in the same manner as in the case of rolled material (subsequent material and first preceding material). In FIG. 3, a straight line rising to the right indicates the trailing edge of the following material, the leading edge X of the following material, the trailing edge of the first preceding material, the leading edge of the first preceding material, and the tail of the second preceding material from the top in the figure. The relationship between the end Y and the position of the tip of the second preceding material and time is shown.

When two first and second winders are used, the first
After the rolling of the rolled material by the winding machine is completed, the product coil of the first winding machine can be removed during the winding of the rolled material by the second winding machine to prepare for the winding of the next rolled material. Becomes The preparation time required from the completion of the winding of the first winding machine to the winding of the next rolled material is a so-called margin time, which is a constraint condition, and the tail end Y of the second preceding material passes the point Q _i . Is the time when the tip X of the succeeding material passes the point P _i .

Here, the point P _i, P extracted pitch of the subsequent material for the first preceding material in the set of Q _{i I} T _i, a second first preceding material
Of the preceding material for extracting pitch P _I T, the point P _i, the constraint of the subsequent material for the second preceding material in the set of Q _i delta
TG _i, the second arrival time TQ _i the tail end Y of the preceding material reaches the point Q _i, the arrival time tip X of the following material reaches the point P _i if _{TP i, P I T + P} I T _i + TP _i = TR _i + ΔTG _i (6) and the constraint condition ΔTG _i , arrival time TP _i , arrival time TQ _i ,
Extracting pitch for the second preceding material of the first preceding material P _I T
Since is determined as described above, the extraction pitch of the subsequent material can be determined P _I T _i. The optimum extraction pitch determiner determines the extraction pitch of the subsequent material obtained by the subsequent material and the second preceding material, and the extraction pitch of the subsequent material obtained by the above-mentioned method and the first preceding material. (3
Compared in 6), the largest one is used as the extraction pitch of the succeeding material.

At this time, the P _I T extracted pitch of the first preceding material for the second preceding material, but shows the case of obtaining a constraint condition with two different points as described above,
May be the conventional similar way how to obtain the the extracted pitch P _I T, or may be determined by extracting the pitch actual value of the rolling line.

From the above, it is possible to obtain an optimum extraction pitch even when a plurality of winders (16) are operated, and it is possible to perform smooth rolling control.

When a plurality of winder (16) does not work, it is not necessary to consider an extraction pitch P _I T for the first preceding material second prior material, (6) Equation (1) Obviously it will be the same as.

In the above embodiment, the extraction pitch in the hot rolling mill (hot strip mill) has been described, but the control device according to the present invention is not limited to this.
Needless to say, the present invention can be applied to an apparatus that intermittently extracts a processed member on a rolling line and performs various kinds of processing.

As described above, according to the present invention, the first and second points have a predetermined distance interval and the extraction pitch calculated at this point can be used.
It is possible to check the separation between two processed members, avoid unnecessary collision and collision of two processed members, and obtain smooth and efficient conveyance of the processed members.

[Brief description of drawings]

FIG. 1 is a block diagram showing an extraction pitch control method according to an embodiment of the present invention, FIG. 2 is a diagram showing a relationship between a position of a processing member on a transfer line and time, and FIG. 3 is two winding machines. Showing the relationship between the position of the processed member on the transfer line and the time when the machine operates, FIG. 4 is a conceptual diagram showing the configuration of a conventional hot rolling mill, and FIG. 5 shows a conventional extraction pitch control method. It is a figure equivalent to FIG. FIG. 6 is a view corresponding to FIG. 2 showing the relationship between the position of a conventional processed member on the transfer line and time. In the figure, (31) is a transfer scheduler, (32) is a transfer schedule storage device, (33) is a required arrival time calculator, (34) is a setter, (35) is a constraint condition setter, and (36) is optimal. It is an extraction pitch determiner. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A process member extraction pitch control method for intermittently extracting a process member on a transfer line and sequentially performing a predetermined process, wherein one of the process members already extracted on the transfer line is selected. Called the preceding material, the first point provided at the position for detecting the tail end of this preceding material, and the machining member to be extracted immediately after the preceding material on the transport line is referred to as the following material,
It has a second point provided at a position for detecting the tip of the succeeding material, and between the tail end of the preceding material at the first point and the tip of the succeeding material at the second point. The first with the time interval that is the necessary constraint condition set
And the second point as one set, in a plurality of sets, from the position where the tail end of the preceding material is extracted, the first point of each set is extracted.
From the position where the tip of the succeeding material is extracted to the second point of each set, and the constraint condition in each set, The extraction pitch of the subsequent material is obtained by calculation, and the maximum extraction pitch among these extraction materials is set as the extraction pitch of the subsequent material, and the second point is located a predetermined distance upstream of the first point. A method for controlling the extraction pitch of a processed member, which is characterized in that.