JPS6336918A - Control device for winding in steckel mill - Google Patents

Abstract

PURPOSE:To make the driving timing of a winding machine optimum by calculating the outlet side plate thickness based on an inlet side plate thickness detector, rolling load detector, plate speed detector and roll gap informations and controlling by finding the progressing distance of the tip of a rolling material from the advance factor. CONSTITUTION:The outlet side plate thickness (h) is first calculated by the respective detection value of the plate thickness detector 14a detecting the plate thickness of a rolling material 11 at the inlet side of a mill 1, the load detector 13 detecting the rolling load and a plate speed detector 19, and the roll gap fed from a rolling reduction device 12. The rolling reduction factor (r) is calculated based on the calculation value thereof and the advance factor (f) is calculated based on the calculation value thereof. The progressing distance L of the rolling material tip is found from the advance factor and rolling material speed, this progressing distance L is compared with the pre-determined reference actuation timing distance L0 and when the difference thereof becomes zero, an actuation command is outputted to a winding machine 5b as the tip position of the rolling material 11 is regarded to have reached to the actuation timing of the winding machine 5b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a winding control device for controlling the startup timing of a winding machine with a heat retention furnace of a Stetskel mill.

[Conventional technology]

4'.

First, an overview of Stetskell Mill will be explained. An example of a Steckel mill is shown in FIG. 1. The suffix a attached to each reference symbol means the front side (or entrance side), and the suffix b means the rear side (or exit side).

Winding machines with heat retention furnaces (hereinafter referred to as coiler furnaces) arranged on both sides of the rolling mill 1 4 a t 4 b t
and a coiler furnace mandrel (hereinafter abbreviated as mandrel) 5a, 5 that constitutes the coiler furnace.
b, upper pinch rolls 6a, 6 that hold down the front and rear ends of the rolled material;
b.

Lower pinch rolls 7a, 7b, furnace guide 8a for guiding the tip of the rolled material to the slit provided in the mandrel
, 8b, table guide 10th.

10b, guide roll 9 that helps thread the rolled material during rolling;
It consists of a and 9b.

Furthermore, pressure by Stetskell mill using Fig.

Let me briefly explain the extension. The rolled material 11 is carried from the front side, passes under the front coiler furnace 4a, is rolled by the rolled material 1, and is wound onto the mandrel 5b of the rear coiler furnace 4b. Pass). When the rear end of the rolled material passes through the rolling mill,
Rolling mill 1. The rear coiler furnace 4b stops and the first
6. The bus is completed. Next, the table guide 10a and furnace guide 8a of the front coiler furnace 4a rise, and the mandrel 5a grips the slit at the position where the rolled material 11 enters and stops. Preparation for winding is complete. In this state, the rolling mill is reversed and an even bus is started. The rolled material is wound up on the mandrel 5a of the front coiler furnace 4a in the same way as the first bus, and when the rear end of the rolled material 11 passes through the rolling mill 1. Front mandrel 5a
stops. Contrary to the completion of the first bath, the inner furnace guide 8b and table guide 10b on the rear coiler furnace 4b side
is raised, the rear mandrel 5b also grips the slit at the position where the rolled material enters, and stops, completing the preparation. Here, the rolling mill 1 rotates normally, and the rolled material 11 is wound up by the rear coiler furnace 4b. The following passes are repeated alternately, and at the final pass (odd pass), the table guide 10b on the side of the rear coiler furnace 4b descends, and when rolling starts, the rolled material 11 is transferred to the rear coiler furnace 4b.
It passes under the road and continues down to Koira (not shown). All of the rolled material is sent out to the down coiler side, and rolling of one roll is completed. The rolled material 11 is wound up by a down coiler to become a hot coil. The above is a brief explanation of rolling using a Stetskell mill.

Conventionally, the start timing of the mandrel is determined by integrating the speed of the rolling mill 1 after the rolled material 11 is bit into the rolling mill 1, and predicting the distance that the tip of the rolled material 11 has traveled from the rolling mill. When the predetermined winding margin reaches the slit, the start timing is recognized, and when the start is started, the even pass is completed. The rolled material 11 is unwound from the rear coiler furnace 4b, When the rolled material 11 passes through the rolling mill 1 after being wound around the mandrel 5a of the front coiler furnace 4a, an even pass is completed. In this state, the rolled material 11 is wound into the front coiler furnace 4a with the front end or the back end remaining, and is in a heat-retained state.

As mentioned above, when the preparation for the odd pass is completed, the rolling mill 1 rotates normally, and the rolled material 11 is fed out from the front coiler furnace 4a, rolled by the rolling mill 1, and its tip is wound around the mandrel 5b of the rear coiler furnace 4b. .

Now, using FIG. 2, a detailed explanation of this winding will be given.

Figure (a) shows the rolled material 11 rolled by the rolling film.
The tip of the mandrel 5b is the rear coiler furnace 4b.
It is shown that it has entered the slit.

No.! In Figure (b), the mandrel 5b is started and the rolled material 11
The figure shows the beginning of winding.

Figure 2 (Q) shows the state immediately before the winding is completed and tension control begins. That is, it can be seen that the leading end of the rolled material is caught in the slit of the mandrel and wound.

[Problem that the invention seeks to solve]

In conventional technology, regarding the start timing of this winding,
Depending on the rolling conditions of the rolled material, for example, if the tip temperature is low,
Or, when attempting to thread the material by adjusting the rolling device and changing the roll gap, no corrections were made in response to variations in the progress of the rolled material. For example, if the start-up timing was delayed. , Slack of the rolled material occurs in the coiler furnace, and since the coiling starts later, the rolled material ends up clinging to the mandrel as it is wound, causing the rolled material to swell and damage the inner wall. . On the other hand, if it is too fast, the tip will not catch on the slit, and the winding will fail. in this case,
The rolling mill had to be stopped, then reversed, and then re-rolled, causing the temperature at the tip of the rolled material to drop excessively, making it impossible to roll at a constant temperature in the longitudinal direction, resulting in thickness fluctuations. do. Furthermore, it is better for the winding allowance at the slit of the mandrel to be shorter than the length and depth of the slit for the following reasons, that is, the rolling direction can be switched,
If a rolled material longer than the length and depth of the slit remains in the slit after being unrolled, that part may be folded over or in a so-called accordion shape. If you leave it as it is, it will not come out through the slit, or conversely, it will come out if it is folded over itself.

There is also a risk that it will reach the rolling mill as it is and be folded and rolled.

As described above, in the conventional technology, the start timing of the mandrel at a certain winding margin during winding of the rolled material has not been controlled.

An object of the present invention is to provide a winding control device that can be activated at a startup timing that enables winding while stably controlling the winding margin at the leading end of the rolled material.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a winding control device for a winding machine having a heat retention furnace of a Steckel mill, in which a thickness detector is provided for detecting the thickness H of a rolled material 11 on the entrance side of the mill 1. 14b, and a load detector 13 that detects the rolling load P of the mill.

A board speed detector 19 that detects the slowness of the passing speed of the rolled material, and the mill's low gap information S and rolling load detection value P calculate the outlet side plate thickness of the mill, and calculate the calculated value and the inlet side thickness. An arithmetic unit that calculates an advance rate f from the plate thickness detection value H, and calculates the traveling distance of the tip of the rolled material from the calculated value f and the detected speed value V of the rolled material, and a predetermined amount of the traveling distance calculation value. A start control bag that has a comparator that compares the reference start timing distance LO and outputs a start command to the winder at a timing based on the difference! ! ! 20 and
It is characterized by having the following.

[Effect]

According to the above configuration of the present invention, each detector detects the entrance side plate thickness H
9. The rolling type P and the speed V of the rolled material are detected, and the starting control device 20 uses these detected values and the roll gap S from the rolling device.

The exit plate thickness is calculated using a gauge meter, the rolling reduction r is calculated based on the calculated value, the advancement rate is calculated based on the calculated value, and the calculated value is integrated to calculate the traveling distance of the rolled material. is required. The obtained traveling distance is compared with a predetermined starting timing distance Lo, and when the difference becomes zero, the tip position of the rolled material has reached the starting timing of the winding machine and a start command is issued to the winding machine. is output.

In this way, it is possible to start winding at the optimum start-up timing, thereby eliminating problems such as winding failure.

〔Example〕

Therefore, detailed explanation will be omitted. Lowering position control device 12. Load cell 13. X-ray thickness gauge 14a, 14b
, rolling mill roll drive motor 5° mandrel drive motor 6a, 16b, motor honor system [17, 1
8a, 18b, a speed detector 19 of the rolling mill, and a control device 2o of the present invention.

In the control bag [20 of the present invention], when the rolled material 11 is bitten into the rolling mill 1, a rolling load P is generated, and a load signal P is inputted from the load cell. From this load signal P, a roll-on signal is created by the comparator 21. On the other hand, rolling load P
From the roll gap S and the roll gap S, the thickness of the exit side of the rolled material is determined by equation (1).

h=s+−...(1) Here S: Roll gap P: Load : Mill constant It is.

Further, the entrance side plate thickness H is detected and input from the X-ray thickness gauges 14a and 14b, although it is switched depending on the direction of the bus.

From this inlet side plate thickness H and the above-mentioned outlet side plate thickness, the rolling reduction r(
2) The operation is detected by the divider and adder according to the equation.

−h ,=□ ...(2) Furthermore, the advanced rate f
Since this is approximately 1/4 of the rolling reduction ratio, the advance ratio f is calculated and detected using equation (3) from the rolling reduction ratio r determined using equation (2).

f=r/4 (3) This advance rate f becomes effective after the load is turned on as shown in FIG. It is set to "0"' when the load is off.

On the other hand, the speed V of the rolling mill is input from the speed detector 19, and the speed V is multiplied by the roll diameter, gear ratio, etc., and the absolute value is taken by the absolute value calculator 27 since it rotates forward and backward.
The speed is multiplied by the advance rate f and integrated by an integrator 28, and the travel distance of the leading end of the rolled material is calculated and detected. This value is compared with a pre-given startup timing distance Lo, and when the difference is found to be "0" in comparison VIII21, the gain is added to the speed feedback value from the speed detector 19 of the rolling mill. A start command is output so that the coiler furnace rotates in a speed pattern. The above time chart is shown in FIG.

From the top, rolling mill speed V, rolling load P, calculated advance rate f, tip position, and load-on signal.

This shows the startup command.

Since load-on is detected at the rise of the load signal and the advance rate is calculated, the integrator is activated and the tip position is calculated and detected. In one embodiment of the present invention in which a start command is output when a predetermined Lo is reached, the rolling mill speed is 9QmPm.

The start timing is calculated so that Lo is 4400 am and the winding margin at the tip is 300 mm. If you have this,
The rolled material is progressing at 1,555+im/S, and 440
In this situation, it takes 2.28 seconds to advance 0mm, and 300
The advancement of mm material is 0.2 seconds. In other words, if there is a delay or advance of about 0.2 seconds after the load is turned on, there is a risk of a missed swing or an accordion sound.

The above description has been made regarding the direction in which the rolled material is either the normal side or the reverse side, but as shown in FIG. 1, the present invention can be effectively applied to both sides by path switching.

As an application example of the present invention when the X-ray thickness gauge can be attached only to one side (rear side), control is performed as follows. The first bus was
The entry side plate thickness H is a fixed value as a rough thickness. In the first pass, the activation timing of the rear mandrel is controlled using the method of the present invention. Subsequently, in the even pass, since the rear X-ray signal corresponds to the entrance side plate thickness, the front mandrel is activated in the same manner according to the method of the present invention. Immediately before the end of this even pass, the exit side plate thickness determined with a gauge meter is memorized, and a circuit is additionally provided to be used as the inlet side plate thickness H of the next odd bus.

Further, as an application example of the present invention in the case where an X-ray thickness gauge is not available, it is possible to control the stable mandrel start-up timing j. A specific example is shown in Figure 8.
In other words, for the first bus, the inlet side plate thickness H is fixed, but the outlet side plate thickness immediately before the end of each pass is stored and used as the inlet side plate thickness for the next pass. According to this example, by simply adding a simple circuit to an existing Stetskell mill, it is possible to stably control the start timing of the mandrel. In addition, since the winding is stable, it is possible to concentrate on rolling the leading and trailing ends, which are at a low temperature, and it is possible to perform high-quality rolling.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to accurately determine the travel distance of the tip of the rolled material based on each detection signal,
Since the winding machine can be started at the optimum start timing based on the calculated value and the predetermined reference start timing distance, the rolled material can be smoothly wound without causing problems such as failure in winding.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a waveform diagram showing signal waveforms of each part of the control device, and FIG.
FIG. 5 is a schematic diagram showing the configuration of a winding machine according to another embodiment without a thickness gauge, and FIG. 5 is a schematic diagram showing the winding operation in the same winding machine in the order of steps. 1...Rolling mill, 2...Backup roll, 3...
・Work roll, 4... Coiler furnace, 5...
・Mandrel, 6... Upper pinch roll, 7... Lower pinch roll, 8... Furnace guide, 9... Guide roll, 10... Table guide, 11... Rolled material, 1
2... Reduction device, 13... Load cell, 14...
X-ray thickness gauge, 15...Motor, 16...Motor, 1
7, 18... Leonard device, 19... Speed detector, 20... Winding control device, 21... Comparator, 22
... Command device, 23 ... Divider, 24 ... Multiplier, 25 ... Adder, 26 ... Pulse generator, 27.
... Absolute value calculator, 28... Integrator.

Claims (1)

[Scope of Claims] 1. A winding control device for a winding machine having a heat retention furnace of a Steckel mill, comprising: a plate thickness detector for detecting the thickness of a rolled material at the entrance side of the mill; and a rolling load of the mill. a load detector that detects the
Calculate the outlet side plate thickness of the mill using a plate speed detector that detects the threading speed of the rolled material, the roll gap information of the mill, and the detected rolling load value, and calculate the advance rate using the calculated value and the detected value of the input plate thickness. and a calculator for calculating the travel distance of the tip of the rolled material based on the calculated value and the detected speed value of the rolled material, and a comparator for comparing the calculated travel distance with a predetermined reference start timing distance. A winding control device for a Steckel mill, comprising: a startup control device that outputs a startup command to the winding machine at a timing based on a difference.