JPH0453603B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a synchronizing device that provides various timings in rolling control of a rolled material, and in particular, a synchronizing device that accurately measures the rolling thickness of each longitudinal portion of the rolled material. The present invention also relates to a synchronization device that provides measurement timing for measuring the thickness of each part in the longitudinal direction of a rolled material in order to uniformly control the thickness.

[Conventional technology]

An example of a conventional device of this type is shown in FIG.

In the figure, 1 is a rolling machine, 2 and 3 are rolled materials,
4 is a rolling force measuring device.

Reference numeral 5 denotes a thickness gauge, which measures the thickness of the material to be rolled 2 using radiation emitted from a radiation source 5a.

Reference numeral 10 is an information processing device that allows the rolling force measuring device 4 and the thickness gauge 5 to measure the rolling force and thickness of the material to be rolled 2 at separate timings, and processes the measured values as appropriate. It is something to do.

First, how to set the timing for the rolling force measuring device 4 will be explained. The information processing device 10 is
At the time when the pressure signal from the rolling force measuring device 4 rises, it is determined that the tip of the material to be rolled has arrived directly below the rolling force measuring device, and thereafter, the tip of the material to be rolled (hereinafter referred to as "reference point") .)
The arrival time of each part of the material to be rolled, which is defined by the distance in the longitudinal direction from the starting point, is determined based on the elapsed time after the rising time or the number of pulses generated by the pulse generator 7 thereafter.

Next, the overall operation will be explained. The plate thickness of the rolled material 2 rolled by the rolling mill 1 is calculated by the following equation by the information processing device 10 based on the rolling force F measured from time to time by the rolling force measuring device 4. , is calculated.

H _G = S + F / M + ε ₁ ... (1) where S: Rolling roll spacing (mm) F: Rolling force (ton) M: Mill spring (ton/mm) H _G : Plate thickness (gauge meter thickness) (mm ) ε ₁ :Error (mm) Furthermore, the thickness of the same rolled material 2 is also measured by a thickness gauge 5, and the thickness Hγ measured by this thickness gauge 5 is also input to the information processing device 10. .

Conventionally, the measurement timing of the thickness gauge 5 is given by the following method.

In the first method, the measurement timing of the thickness gauge 5 is a fixed time t (t=l/v, where l is the distance between the rolling force measuring device 4 and the thickness gauge 5, and v is the normal rolling speed). Therefore, when the normal rolling speed changes from v to v', the actual delay time t becomes t'=l/v', which results in a large difference from t.

In the second method, the speed v of the plate is calculated from the radius r and rotational speed ω of the rolling roll 11, and the delay time t is given based on this v and the distance l. That is, v = (1 + α) rω (however, α is the advance rate) t = l/v Since the advance rate α changes depending on the state of normal rolling, the error in v will also increase the error in t. (I will explain this in detail later).

In the third method, the timing is determined by the rise point of the thickness gauge output. In this method, the shape of the tip of the plate (see Figure 3) can be seen from the difference between curves 105 and ¹⁰⁵¹ in Figure 4.
The timing of provision differs depending on the placement position of the thickness gauges 105 and ¹⁰⁵¹ in the board width direction (see upper right in FIG. 4) (this will also be explained in detail later).

The information processing device 10 compares the plate thicknesses H _G and Hγ side by side in the plate length direction, and determines the error ω ₁ from the difference between the two.
The rolling mill 1 is controlled so that the values are canceled out and a uniform plate thickness is obtained.

[Problems with conventional technology]

As described above, the first conventional method has the disadvantage that the measurement timing of the thickness gauge 5 changes depending on the rolling speed v, and the second conventional method also has the disadvantage that the measurement timing of the thickness gauge 5 changes depending on changes in the rolling speed v. Similarly, in the conventional third method, the measurement timing of step 5 varies depending on the variation of the advance rate α, and the measurement timing of step 5 varies depending on the tip shape of the rolled material and the placement position of the thickness gauge 5 in the strip width direction. Therefore, in the conventional method, it is difficult to make two or more measurements at the same position on the rolled material, so it is difficult to properly control the thickness of the rolled material. was not carried out.

[Purpose of the invention]

Therefore, it is an object of the present invention to control the rolling speed v and advance rate α of the material to be rolled, the shape of the tip of the material to be rolled, and the arrangement position of the thickness gage 5 and others with respect to the thickness gage 5 and others. It is an object of the present invention to provide a synchronization device that can supply an accurate timing signal without any problems, and can therefore easily perform two or more measurements of plate thickness and other measurements at the same location on a rolled material.

[Means to achieve the purpose]

In order to achieve the above object, the synchronization device according to the present invention includes a pulse generator 7 that generates pulses according to the rotation speed of the rolling rolls 11 of the rolling mill 1, a rolled material 2,
a rolling force measuring device 4 for measuring the rolling force of the rolled materials 2 and 3 installed downstream of the rolling mill 1;
A first measuring device 6 that measures the above, and a second measuring device 5 installed further downstream of the first measuring device 6.
an information processing device 10, the first measuring device 6 is a measuring device that measures changes in the sheet width direction, and the information processing device 10 includes the rolling force measuring device 4 and the first measuring device 6, the positional relationship between the rolling force measuring device 4, the first measuring device 6, and the second measuring device 5, and the change in the rolled materials 2, 3 from the rolling force measuring device 4 to the first measuring device 6. The measurement timing of the rolled materials 2 and 3 by the second measuring device 5 is determined based on the number of pulses outputted by the pulse generator 7 while the rolling materials 2 and 3 pass through.

〔Example〕

An embodiment of the present invention shown in FIG. 2 will be described below. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts, so the explanation thereof will be omitted. 6 is a plate width meter that optically measures the width of the material to be rolled 2; 7 is a pulse generator (hereinafter referred to as PLG) that measures the rotation speed of the rolling roll of the rolling mill 1;
It is attached to the above-mentioned rolling roll. l ₀ is rolling mill 1
and the plate width gauge 6, and _l1 is the distance between the rolling mill 1 and the thickness gauge 5.

Here, the distance l ₀ is appropriately determined in consideration of equipment constraints within a range that is not too excessive.
Further, the distance l ₁ is similarly determined as appropriate within a range where l ₀ <l ₁ and is not excessively large.

Next, the operation will be explained. For simplicity, it is assumed that the tip end shape of the rolled material 2 is straight in the width direction as shown in the figure.

PLG7 is the rotation angle of the rolling roll △ω (radian)
Assuming that one pulse is generated every time, and the rolling roll radius of rolling mill 1 is rcm, the rolled material 2 is △l for every one pulse of PLG 7 △l=(1+α)r・△ω...(2) It is well known that Here, α is called an advance ratio, which normally changes depending on the rolling state of the rolling mill 1, but is known to hardly change depending on the rolling speed.

Under the above premise, the tip 21 of the rolled material 2
However, if the PLG 7 generates n ₀ pulses from the time it is bitten by the rolling mill 1 until it reaches just below the strip width gauge 6, then l ₀ = △l×n ₀ = (1+α)r・△ω×n ₀ ...(3).

Similarly, if the PLG 7 generates n ₁ pulses from the time when the tip 21 of the material to be rolled 2 is bitten by the rolling mill 1 until it reaches just below the thickness gauge 5, then l ₁ = △l×n ₁ =(1+α)r・△ω×n ₁ ...(4).

Therefore, from equations (3) and (4), n ₁ =l ₁ /Δl=l ₁ /l ₀ ×n ₀ (5).

Therefore, the tip end portion 21 of the rolled material 2 is at the timing when the n _- th pulse given by equation (5) is generated counting from the time when it is bitten by the rolling mill 1. This means that it is just below the total thickness of 5.

What should be noted in equation (5) is that the advanced rate α, which has a large error, has completely disappeared. Therefore, when the measurement timing is given using equation (5), it is clear that more accurate measurement of the determined region is possible.

That is, in the conventional method, the timing at which the thickness gauge 5 can be read is usually determined by the timing at which the thickness gauge 5 rises, as described above, but according to the present invention, the timing at which the thickness gauge 5 can be read is determined by the timing at which the thickness gauge 5 starts to read. Furthermore, it is possible to provide measurement timing with higher accuracy than conventional methods.

Now, if the tip shape of the rolled material 2 is always straight in the width direction as shown in Fig. 2, it is possible to catch the timing of the rise of the thickness gauge as described above, but usually The shape of the tip of No. 2 is often as shown in Figure 3, and since the angle at which the thickness gauge starts up varies widely, the method of detecting the timing of such things will not be accurate at all. There will be cases where it doesn't match.
However, according to the present invention, timing can be provided synchronously even in such a case. This will be explained below using FIG. 4.

In FIG. 4, a typical example in which the tip end shape of the material to be rolled 2 is as shown in FIG. 3b will be explained. In the figure, a rolling mill 1, a width gauge 6, a thickness gauge 5 near the center, and a thickness gauge ⁵¹ closer to the side edges are arranged as shown. Assume that when plotting the horizontal axis with the number of pulses of PLG 7 and the vertical axis with the output of each instrument, the output waveform shown in the figure is obtained. If the time delay of each instrument is ignored at this time, the difference between the rise of the rolling force meter output 101 and the rise of the plate width meter output 106 is n ₀ pulses.

However, since the thickness gauges 5 and 5 ¹ do not measure the entire plate width direction, but only local areas, the rise of their outputs is at the tip of the rolled material 2. Shape and thickness 5,
5.It depends largely on the arrangement position in the width direction of ¹ .

In the case of the arrangement positional relationship as shown in Fig. 4, the rise timing of the output 105 of the thickness gauge 5 in the center is n ₁ + △n ₁ , and △n ₁ (>0) happens to be an extremely large error. However, the rise timing of the output 105 ¹ of the thickness gauge 5 ¹ near the edge is
n ₂ +△n ₂ , and △n ₂ (<0) becomes a considerably large value.

In this way, the error △n changes depending on the shape of the tip of the rolled material 2 and the placement position of the thickness gauges 5 and 5 ¹ in the width direction of the sheet, and moreover, the error is unpredictable. According to the invention, the rising timing (reference timing) of the output of the rolling force measuring device 4 and the output of the strip width meter 6 is set when the predicted rolling force and the predicted strip width exceed, for example, 90%. Therefore, that part (i.e., reference part) in the rolled material 2 (see 22 in Fig. 4)
can be determined uniquely.

According to the method of this invention, the above-determined portion comes directly under each thickness gauge at the timing of n ₁ =l ₁ /l ₀ ×n ₀ , n ₂ =l ₂ /l ₀ ×n ₀ It is possible to provide timing. According to this method, these timings do not depend on the shape of the material 2 to be rolled.

In the above embodiment, the example in which the measurement timing of the thickness gauge 5 is provided has been described, but the present invention can also be applied to cases in which all kinds of measurement timings are provided, such as the measurement timing of a thermometer or a flat shape measuring meter. It is possible.

And an optical plate width meter 6 as a first measuring device.
Since it is involved in sheet width measurement and timing determination, it includes an arithmetic function for calculating sheet width, but as far as the timing determination, which is the purpose of this invention, is concerned, it can be used as the first measuring device. teeth,
The arithmetic function to calculate the plate width is not necessarily necessary, and the total amount of light passing through the entire plate width direction is calculated by a predetermined percentage.
It is sufficient to be able to determine that the amount has decreased.

In addition to measurement, when performing sheet width control, etc., a hard roll (edger roll) is placed at the position of the thickness gauge, and the timing when controlling the edger roll is given in accordance with the timing of the horizontal roll. It can also be applied to

〔Effect of the invention〕

As described above, according to the present invention, the pulse output of the pulse generator that generates pulses corresponding to the number of rotations of the rolling rolls of the rolling mill, the rise timing of the output of the rolling force measuring device, and the output of the plate width meter are controlled. Since the timing signal is obtained based on the rise timing, it is possible to accurately determine each measurement location without being affected by the rolling speed, advance rate, tip shape of the rolled material, placement position of the thickness gauge, etc. There are various effects such as a timing signal can be obtained, the thickness of the material to be rolled can be measured at a desired position, and the accuracy of thickness control is improved.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a conventional device, Fig. 2 is a block diagram showing an embodiment of the present invention, Fig. 3 is a diagram showing the tip shape of the rolled material, and Fig. 4 explains the operation of the present invention. FIG. In the figure, 1 is a rolling mill, 11 is a rolling roll,
2 and 3 are the material to be rolled, 4 is a rolling force measuring device (rolling force meter), 5, 5 ¹ is a thickness gauge, 5a is a radiation source, 6 is a plate width gauge, 7 is a pulse generator (PLG), 10 2 is an information processing device, 21 is the leading edge (reference portion) of the tip of the rolled material 2 in FIG. 2, 22 is the reference portion of the rolled material 2 in FIG. 4, 101 is the rolling force meter output, and 106 is the strip width. The meter output, 105, is the output of thickness gauge 5 near the center, 10
5 ¹ is the output of the thickness gauge 5 ¹ near the side edge, l ₀ is the distance between the rolling mill 1 and the plate width gauge 6, l ₁ is the distance between the rolling mill 1 and the thickness gauge 5, l ₂ is the distance between the rolling mill 1 and the thickness gauge 5 ¹ , n ₀ is the distance between the tip 21 of the rolled material 2,
The number of pulses generated by the pulse generator 7, n ₁ and n _{2 ,} is the number of pulses generated by the pulse generator 7 from the time the material is bitten by the rolling mill 1 until the material reaches just below the width gauge 6. This is the number of pulses generated by the pulse generator 7 from when it is bitten by the machine 1 until it reaches just below the thickness gauge 5 or ⁵¹ . Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A pulse generator 7 that generates pulses according to the rotation speed of the rolling rolls 11 of the rolling mill 1, a rolling force measuring device 4 that measures the rolling force of the rolled materials 2 and 3,
A first measuring device 6 installed downstream of the rolling mill 1 to measure the rolled materials 2 and 3, a second measuring device 5 installed further downstream of the first measuring device 6, and an information processing system. The first measuring device 6 is a measuring device that measures changes in the sheet width direction, and the information processing device 10 includes the rolling force measuring device 4 and the first measuring device 6. The change in output, the positional relationship of the rolling force measuring device 4, the first measuring device 6, and the second measuring device 5, and the distance between the rolling force measuring device 4 and the first measuring device 6 of the rolled materials 2 and 3. A synchronizing device configured to determine the measurement timing of the rolled materials 2 and 3 by the second measuring device 5 based on the number of pulses output by the pulse generator 7 during passing. 2 The information processing device 10 determines that the rolling force measuring device 4 or the first measuring device 6 has passed when the output of the rolling force measuring device 4 or the first measuring device 6 reaches a predetermined ratio of the predicted output value when the rolled materials 2 and 3 pass. A synchronizing device according to claim 1, which is configured to do so.