JPS6390317A - Rolling device provided with coil box - Google Patents

Abstract

PURPOSE:To prevent a coil from generation of transfer damage by winding a sheet from the preceding rolling mill on a 1st cradle roll in a coil box and adjusting a time when the sheet is transferred to an adjacent 2nd cradle roll by a mandrel based on the measured weight. CONSTITUTION:A striplike steel sheet delivered from a rough rolling mill RM is wound on a 1st cradle roll 1CR in a coil box through a deflector roll DR and a bending roll BR. At that time, the weight of a coil C is measured and if the weight is large, the coil stock is immediately transferred to a 2nd cradle roll 2CR by a mandrel to be sent to a finishing rolling mill FM. If the weight is small, the coil is slowly transferred to prevent damage due to bounds, etc., and is sent to the finishing rolling mill FM. Damage to the coil is prevented by the winding device provided with the coil box.

Description

[Detailed Description of the Invention] [Statement of the Invention] (Industrial Application Field) The present invention relates to a rolling machine equipped with an intermediate reel mechanism called a coil box. This invention relates to control of rewind start timing.

(Prior Art) In a hot strip mill, an intermediate reel mechanism called a coil box is disposed between a rough rolling mill and a finishing mill for the purpose of removing temperature unevenness in the rolled material. Conventionally, using this coil box, the material that has been rolled by a rough rolling mill is once rolled up by the first cradle roll-L, and this rolled material (hereinafter referred to as a coil) is transferred to the next finishing rolling mill. For rolling, a transfer arm is used to unwind the material on a first cradle roll and transfer it onto a second cradle roll located on the finishing rolling mill side. This is to make effective use of the coil box, and after the coil has been transferred to the second cradle roll 1-, the next coil can be continuously formed on the first cradle roll 1-. .

Figure 2 is a transition diagram of rolling using this coil box, in which RM is a rough rolling mill, DR is a deflection roll,
BR is bending roll, C is coil, ICR is first
Cradle roll, 2CR is the second cradle roll, F
M is a finishing mill. Figure (a) shows the material rolled by the rough rolling mill RM passing through the deflection roll DR and bending roll BR to form a coil C on the first cradle roll ICR, and (b) shows the state in which the material rolled by the rough rolling mill RM passes through the deflection roll DR and the bending roll BR to form a coil C on the first cradle roll ICR. (c) shows the state when the coil C is unwound on the first cradle roll ICR. In addition, (d) shows a state in which the coil C is being transferred from the first cradle roll ICR to the second cradle roll 2CR by a transfer arm (not shown) while rewinding the coil C. Once started, insert the mandrel into coil C,
The transfer arm lifts the second
The order is that the mandrel is transferred onto the cradle roll 2CR and the mandrel is pulled out after the transfer χ7. Further, (e) shows a state in which the coil C has been transferred onto the second cradle roll 2CR.

(The problem to be solved by the invention) In the above-mentioned transition diagram, when the diameter of the coil wound at the time of unwinding the coil in (C) is small, that is, when the length of the wound material is short and the weight of the coil is light, During coil unwinding, the coil C bounces on the first cradle roll ICR, and the coil C falls onto the material conveying device, resulting in material flaws or damage to the material conveying device.

The present invention includes a coil box in which bouncing of the coil during unwinding can be prevented by controlling the timing to start unwinding the coil on the first cradle roll L of the coil box based on the weight of the coil. The purpose is to provide a rolling equipment.

[Structure of the invention]

(Means for solving the problem) The present invention checks the weight of the coil when starting to unwind the coil on the first cradle roll of the coil box, and if the weight of the coil is larger than a certain value, the weight of the coil is checked. , JjL are started as they are, and if they are small, rewinding is started after the mandrel is inserted.

(Function) When the weight of the coil is light, unwinding is started after the mandrel is inserted, so the coil is fixed by the mandrel and bounce is prevented.

(Example) The present invention will be explained below with reference to an embodiment shown in FIG.

FIG. 1 is a block diagram showing the main parts of an embodiment of the present invention. In the same figure, 1 is the first cradle roll ICH
This is a position detector that is attached to and detects its rotational position, and a device signal made up from this position detector 1 is input to a material movement amount detector 2. The material movement amount detector 2 calculates the amount of material movement that has passed over the first cradle roll ICR based on the position signal. Material movement: A movement amount signal output from the detector 2 is input to the winding material length calculator 3. This winding material length calculating unit 3 calculates the length of the winding material by integrating the movement amount signal from the time when the coil box starts winding the material to the time when the material winding ends. A winding material length signal from the winding material length calculator 3 is manually inputted to a coil weight (hereinafter referred to as PIW) calculator 4. This PIW
The calculator 4 calculates the PIW based on the winding material length signal.

The PIW signal from the PIW calculator 4 is input to a comparator 5, where the PIW signal is set by the PIW setting device 6.
It is compared with the W setting value, and a signal corresponding to the magnitude relationship between the two is output. The output signal of this comparator 5 is input to a timing control device 7. This timing control device 47 controls the timing to start unwinding the coil C, the timing to insert the mandrel, the timing to start the transfer by the transfer arm, the timing to remove the mandrel after the transfer is completed, etc. according to a predetermined sequence. At this time, depending on the comparison result from the comparator 5, different sequences are applied regarding the rewinding start time and the mandrel insertion time.

The operation of this embodiment having such a configuration will be explained in more detail.

When the material movement ffi detector 2 converts the signal from the position detector 1 from the P1 position into the material movement amount, K is the coefficient.
The material movement amount is calculated using the following equation (1).

L-KXP・・・・・・・・・・・・・・・・・・
(1) The winding material length calculator 3 calculates the time from the start of material winding to the completion of winding by the coil box as T.

Then, the length L of the material to be wound is calculated using the following equation (2).

The PIW calculator 4 calculates the PIW using the following equation (3), based on the length L of the rolled material determined by the above equation (2), where the plate thickness h1 unit width W1 material specific gravity F.

PIW-1-h fist W・F・・・・・・・・・・・・
(3) Here, it is assumed that plate thickness h1 unit width W1 material specific gravity F are given by a manual setting device or a host computer (not shown).

The comparator 5 calculates (4
) and perform the comparison shown in the formula, PIW<PIW...
・・・・・・・・・・・・・・・・・・・・・・・・(4
) When the condition of equation (4) is satisfied, a standby signal is output to the timing control device 7 to wait for coil rewinding by the first cradle roll 1CH.

When the timing control device 7 does not receive a standby signal,
The timing of fill rewinding and transition is controlled according to the following sequence. That is, the first cradle roll I
When material winding on the CR is completed, a rewind start command is immediately issued to a roll drive device (not shown) to start coil rewinding. This unwinding is normally started by introducing the rear end of the coil by a feed roll (not shown) into a pinch roll (not shown) located at the entry side of the rolling mill at a later stage. When the material is detected to be caught in the pinch roll, the timing control device 7 inserts the mandrel into the coil C and starts the transfer arm to perform the transfer operation. When the transfer is completed, the mandrel is inserted into the coil C. Pull it out from coil C. Incidentally, the above procedure is the same as that in the conventional machine.

On the other hand, when receiving the standby signal, the timing control device 7
applies a different sequence from the above regarding the coil unwinding start time and the mandrel insertion time. That is, when winding of the abrasive material is completed, the mandrel is first inserted into the coil C,
After confirming the completion of this insertion, a rewinding start command is issued to the roll drive device. As a result, SJ with the first cradle roll ICR1- is started with the mandrel inserted.

At that time, the mandrel presses the coil C against the first cradle roll ICR--as a result, the mandrel pushes the coil C against the first cradle roll ICR-1.
: Fixed to prevent bouncing. Then, when the unwinding is started and the rear end of the coil C is caught in the pinch roll, a transfer operation by a transfer arm (not shown) is started, and after the transfer is completed, the mandrel is pulled out. .

In this way, if the coil weight is lighter than a predetermined set weight, coil unwinding is started after the mandrel is inserted, thereby preventing the coil from bouncing on the first cradle roll ICR and preventing material defects. This prevents damage to the transport device.

Although the above has only described the coil bound on the first cradle roll, also on the second cradle roll,
As the unwinding progresses and the coil becomes lighter, coil bound may occur. To prevent this, the mandrel may be pulled out after the unwinding is completed.

〔Effect of the invention〕

As described above, according to the present invention, when unwinding the coil wound on the first cradle roll by the coil box, if the weight of the coil is lighter than a predetermined value, unwinding is started after the mandrel is inserted. As a result, it is possible to prevent the coil from bouncing during unwinding, thereby preventing damage to the material bottom or the material conveying device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of main parts of an embodiment of the present invention, and FIG.
The figure is a transition diagram of rolling using a coil box placed between a rough rolling mill and a finishing rolling mill. 1...Position detector, 2...Material movement amount detector, 3.
... Rolling material length calculator, 4... PIW calculator, 5...
・Comparator, 6... PIW setting device, 7... Timing control device, C... Coil, ICR... 1st cradle roll, 2CR... 2nd cradle roll, RM.
... Rough rolling mill, FM... Finishing rolling mill. Applicant's agent: Sato - Figure 1

Claims (1)

[Claims] Between the front rolling mill and the rear rolling mill, the material that has been rolled at the front stage is once rolled up on a first cradle roll to form a coil, and this coil is unwound to be supplied to the rear rolling mill while rolling the mandrel. In a rolling machine equipped with a coil box that is inserted and transferred from above the first cradle roll to a second cradle roll located on the rear rolling mill side, the weight of the coil wound on the first cradle roll is detected. and a comparison means that compares the detected coil weight with a predetermined weight setting value. If the result of the comparison is that the coil weight is heavier than the weight setting value,
The method further comprises timing control means for starting the unwinding immediately after the winding is completed, and for starting the unwinding after the insertion of the mandrel is completed when the amount of electricity is less than a coil weight setting value. Rolling equipment with coil box.