JPS5844588B2 - How to wind up bars - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for winding a bar with a diameter of 8 mm or more, which is called a bar-in-coil.

Bars manufactured from steel are wound into a laminated spiral shape by a winding device disposed on the exit side of a final rolling mill in preparation for shipping.

As this type of winding device, a polling type winding device or a laying type winding device is known, and the former is mainly used for the above-mentioned bar material.

In short, this polling type winding device is a reel that can be rotated around a vertical axis, and as shown in FIG. When the bar material 20 is spirally wound, an inner cylinder 13 that regulates the inner circumference of the spiral, and an outer cylinder 14 that regulates the outer circumference,
It is arranged upright concentrically with the vertical shaft 11.

Then, the bar 20 is guided from the roll 15 of the final stand, through the pinch roll 16, to the guide pipe 17, and reaches the reel 10 consisting of the bottom plate 12, the inner cylinder 13 and the outer cylinder 14,
For example, winding is performed from the inner cylinder 13 side to the outer cylinder 14 side with the tip of the bar moored at an appropriate position at the lower end of the inner cylinder as the starting end, and the winding is performed on the inner circumferential surface of the outer cylinder 14. When reaching , the first layer of spiral coil located at the lowest layer is formed, and then the winding position of the bar 20 transitions to the upper layer of the last turn of the first layer of spiral coil, and the above-mentioned Contrary to that, winding is performed from the outer cylinder 14 side toward the inner cylinder 13 side, and a second layer of spiral coils is formed.

By repeating such a process, a large number of spiral coils are stacked upwards and the bar material 20 is wound onto the reel 10, but it is possible to increase the usage efficiency of the reel 10 and make the packaging look more beautiful. Since it is naturally required that the bars 20 should not be placed in place during transportation, the shape of the winding is such that the excess gaps between the bars 20 are as small as possible and the bars 20 are arranged as closely as possible, as shown in Fig. 2. need to be in state.

In other words, it is desirable to minimize the gap between the turns of the spiral coils in each layer and to make each spiral coil flat.

As for the interlayer gap in the vertical direction, by taking into consideration the spiral coils in each layer as described above, the coils will be automatically stacked densely due to the weight of the upper layer coil.

In order to obtain a flat spiral coil with no gaps between turns, the rotational speed of the reel 10 may be controlled to match the feeding speed of the bar 20 to the reel 10.

Conventionally, a method for controlling the rotational speed of the reel 10 called a wobbling control method has been adopted based on this viewpoint.

In this method, as shown in Fig. 3, the outer cylinder 14 is
When winding toward the side, the number of revolutions per unit time of the reel (
The reel rotation speed (hereinafter simply referred to as reel rotation speed) is decreased at a constant rate, and conversely, when winding from the outer cylinder 14 side to the inner cylinder 13 side, the reel rotation speed is controlled to increase at a constant rate.
In order to match the circumferential speed of the reel 10 at the portion of the bar 20 that is to be wound onto the reel 10 (hereinafter referred to as the winding progressing portion) with a substantially constant bar material supply speed, the winding progressing portion is moved closer to the inner cylinder 13. If the winding section is positioned closer to the outer cylinder 14, the reel rotation speed is set to a higher value, and conversely, if the winding progressing portion is located closer to the outer cylinder 14, the reel rotation speed is set to a lower value.Qualitatively speaking, this method achieves the intended purpose. It looks like a crab.

However, this method has the following problems.

In other words, as shown in Fig. 3, in this system, one cycle consists of a deceleration process and a subsequent speed-up process, and the time change in the reel rotation speed is controlled so as to form a triangular waveform as shown in Fig. 3. However, the period T' of this one cycle and the difference between the maximum value (or minimum value) and the median value of the reel rotation speed,
In other words, the reality is that the amplitudes A' of the triangular waves are determined empirically, and these values also vary depending on the diameter of the bar material, so in reality, the operator monitors the winding condition when reeling. Because the rotation speed was manually adjusted, the adjustment work was troublesome, and it also led to adjustment errors, and even if there was no gap between turns, excessive tension was applied to the bar material, causing so-called winding, and some Turns often jump out of the reel, making it impossible to wind them, or the winding appearance becomes disordered. Moreover, gaps between turns may remain, and the second
It was rare for the paper to be wound into the ideal form shown in the figure.

, This is due to the fact that in implementing this method, empirical elements are mixed in and manual control is required.

In addition, when winding a so-called heavy coil with a coil unit weight of 2 ttyn or more, which has been strongly demanded recently, the speed at which the bar is delivered from the roll of the final stand of the finishing mill (hereinafter simply referred to as the bar speed) must be matched. In order to obtain the fluctuation period of the reel rotation speed, an extremely high-output motor is required to drive the reel, and the equipment cost is extremely high, and the control method described above has a major drawback from an economic standpoint. .

The present invention has been made in order to eliminate the drawbacks of the prior art, and its purpose is to maintain the rotational speed of the reel itself at a constant value that matches the speed of the bar exiting the final stand without changing the rotational speed of the reel itself. In contrast, the number of rotations per unit time of the pinch roll installed in front of the bar guide pipe to the reel (hereinafter simply referred to as the number of rotations of the pinch roll) is the number of rotations of the bar on the reel. By periodically changing the circumferential speed of the winding section, the rod can be wound more densely onto the reel, increasing the coil filling rate on the reel, and is also suitable for reel driving when winding so-called heavy coils. To provide a bar material winding method that requires a small motor output and reduces equipment costs.

A feature of the present invention is that while rotating a reel in which an inner circumference regulating member and an outer circumferential regulating member are arranged concentrically, a bar material supplied from the rolling equipment toward the reel is inserted between the inner and outer circumferential regulating members. When winding the material into a flat spiral shape into a single layer and winding such layers into a laminated state, a pinch roll is provided between the final stand of the rolling equipment and the reel, and a pinch roll is provided between the final stand and the pinch roll. A looper is provided between the reel and the number of rotations per unit time NR of the reel is set to a constant value given by the following formula (I), while the number of rotations per unit time of the pinch roll is set such that the average value thereof is NP expressed by the following formula (I), the period is changed periodically so that the T1 amplitude expressed by the following formula (III) becomes A expressed by the following formula (■), and the bar generated due to this control is The loop of material is absorbed by the looper.

However, ■ = bar speed ro at the exit of the final stand: inner radius ri of outer circumference regulating member: outer circumferential radius r of inner circumference regulating member: radius a of pinch roll: bar diameter: correction coefficient (0<k< 1) Hereinafter, the method for winding up a bar according to the present invention will be specifically explained based on drawings showing examples thereof.

FIG. 4 is a schematic diagram showing an embodiment of the method of the present invention, in which 10 is a reel, 17 is a guide tube, 15 is a roll of the final stand in a bar rolling equipment, and bar 20 is a roll of the final stand. After leaving 15, Loopa 18, which will be described later,
1B, the material is fed into the reel 10 from the guide tube 17 via the pinch roll 16, wound into a plane spiral shape within the reel 10 to form a single layer, and is wound into a state in which such layers are laminated.

The reel 10 has an inner cylinder 13 that is an inner circumference regulating member that regulates the inner circumference of the spiral when the bar 20 is spirally wound on a bottom plate 12 that rotates together with a vertical shaft 11, and an outer circumference regulating member that regulates the outer circumference. It is constructed by disposing a barrel outer cylinder 14 concentrically with the shaft 11, and the structure of this IJ-rule 10, guide pipe 1T, and final stand roll 15 itself is completely different from the conventional one shown in FIG. It's the same.

In the apparatus for carrying out the method of the present invention, a looper 18 is disposed between the roll 15 of the final stand and the pinch roll 16 disposed on the entrance side of the guide pipe 17.

And the reel 10 is the final stand's roll 1.
The pinch roll 16 is rotated at a constant rotation speed that matches the speed of the bar material delivered from the reel 1.
The rotational speed is controlled to change periodically by matching the peripheral speed of the bar material winding progress portion at 0.

The looper 18 is designed to absorb the loop of the bar 20 that occurs as the rotational speed of the pinch roll 16 changes.

Therefore, the length of the loop or the amount of slack of the bar 20 in the looper 18 can be periodically increased or decreased depending on the rotation speed of the pinch roll 16, or in other words, depending on the position of the winding portion of the bar 20 on the reel 10. However, in order to prevent the amount of slack from becoming too large or too small and causing tension on the bar between the roll 15 of the final stand and the pinch roll 16, the pinch should be adjusted according to the rotational speed of the reel 10. The rotational speed of the roll 16 is controlled to a value that matches the bar speed at the exit of the roll 15 at the final stand.

Next, first, reel 1, which is necessary for performing the above-mentioned control.
The process of deriving theoretical formulas and experimental results for determining the rotation speed of 0, the rotation speed of the pinch roll 16, its fluctuation period, and other specifications will be explained.

FIG. 5 is a plan view showing only the outer peripheral surface of the inner cylinder 13 and the inner peripheral surface of the outer cylinder 14 of the reel 10. It depicts a state in which the winding progressing portion, more precisely, the bar center line in the winding progressing portion has reached a position r from the center of the reel over time.

Assuming that a further minute time dt has now elapsed at the reel rotational speed NR and that the winding progressing portion has moved toward the outer cylinder 14 by dr during this time, a relationship is established where the diameter of the bar is a.

Conversely, when winding is started from the outer cylinder 14, the winding progressing portion moves toward the inner cylinder 13, so in this case, the following holds true.

Solution of the differential equations (1) and (1') The distance from the reel center of the winding portion at the time t has elapsed from the start of winding of the spiral coil layer, that is, the radius r, is t.
When winding from the inner cylinder 13 side to the outer cylinder 14 side, the function is given by equation (2), and when winding from the outer cylinder 14 side to the inner cylinder 13 side, it is given by equation (2').

However, ri+a/2 (ri is the outer radius of the inner circumference regulating member) and r.

-a/2 (ro is the inner radius of the outer circumference regulating member) is an initial value at the time of starting winding when winding is started from the inner cylinder 13 side and from the outer cylinder 14 side, respectively.

In addition, in FIG. 4, the bar 20 that has passed through the pinch rolls 16 is sequentially wound onto the reel 10 without slacking on the way, so the circumferential speed of the portion of the bar 20 on the reel 10 where the bar 20 is being wound is 2πr NR, and the pinch Roll peripheral speed 2
πrpNp (where rp is the radius of the pinch roll, NP is the number of rotations per unit time of the pinch roll) is equal to (3
) holds true.

Therefore, by substituting the above equations (2) and (2') into equation (3), the number of pinch rolls 16 required when winding the bar 20 onto the reel 10 from the inner cylinder 13 side to the outer cylinder 14 side is calculated. The number of rotations NP is expressed by the equation (4), and the number of rotations NP of the pinch roll 16 required when winding the bar 20 onto the reel 10 from the outer cylinder 14 side toward the inner cylinder 13 side is expressed by the equation (4'). each t
is given as a function of

In other words, when the bar 20 is wound on the reel 10 from the inner cylinder 13 side to the outer cylinder 14 side, the rotation speed of the reel is set constant, but the circumferential speed of the bar material winding progress portion increases, so the rotation speed of the pinch roll 16 is (
4) increases with time t as given by the formula,
Conversely, when the bar 20 is wound on the reel 10 from the outer cylinder 14 side to the inner cylinder 13 side, the reel circumferential speed in the progressing portion of the rod winding decreases, so the pinch roll 16 The rotational speed also decreases with time t, as given by equation (4').

Incidentally, the speed of the bar material leaving the roll 15 of the final stand is determined to be substantially constant from a macroscopic point of view, depending on the rolling schedule, even if wow and flutter occur along the way.

Therefore, the bar material 20 sent out at a substantially constant speed from the roll 15 of the final stand is given slack by the loopers 18 and 1B, and then passes through the pinch roll 16 whose rotation speed changes periodically as described above, and then is delivered at a constant speed. Since the bar material is fed to the reel 10 which rotates at the same number of revolutions, although the speed of the bar from the roll 15 of the final stand to the reel 10 is partially different, in the end the bar material is fed to the reel 10 which rotates at the same Since all of the bar stock produced is wound onto the reel 10, the average circumferential speed of the reel 10 must match the bar stock velocity (2) exiting the roll 15 of the final stand.

The average circumferential speed of the IJ-ru 10 is the outer circumferential radius ri of the inner cylinder 13 and the inner circumferential radius r of the outer cylinder 14.

The rotation speed NR of the reel 10 required to obtain this circumferential speed is given by equation (I).

Similarly, when looking at the pinch rolls 16, the number of rotations of the pinch rolls 16 fluctuates periodically as described above, but ultimately the bar 20 that leaves the roll 15 of the final stand
It is necessary to feed all of this to the reel 10 side, so the average circumferential speed of the pinch roll 16 must match the bar speed ■ from the roll 15 of the final stand, and in order to obtain this average circumferential speed, 16 pinch rolls required for
The average number of rotations Np is given by the formula (It). Therefore, the reel 10 and the pinch roll 16 are
The above (I) in which each of the bar speeds from 5 to 5 is matched to this bar speed V.

It is sufficient to rotate at the rotational speeds NR and NP given by equation (I).

Assuming that the reel 10 is rotated at the rotation speed NR given by the above formula (I), the relationship between the rotation speed of the pinch roll 16 and the rotation speed of the reel 10 is then determined by the maximum rotation speed NP IIL of the pinch roll 16.

The minimum rotational speed Npmm, the fluctuation period T of the rotational speed of the pinch roll 16, and the amplitude A of the pinch roll 16 are derived.

First, the rotation speed of the pinch roll 16 becomes maximum at (4'
) When 1=0 in the equation, that is, when the bar 20 starts winding in contact with the outer cylinder 14 of the reel 10, it is given by the equation (5) derived from the equation (4') and the equation (I). , and the number of rotations of the pinch roll 16 is minimized when 1 =
0, that is, when the bar 20 contacts the inner cylinder 13 of the reel 10 and starts winding, and is given by equation (6) derived from equations (4) and (I).

The fluctuation period T of the rotation speed Np of the pinch roll 16 is (4)
In the formula, the time t is defined as the time from when the bar 20 contacts the inner cylinder 13 and winding begins until the bar 20 contacts the outer cylinder 14 and winds one layer, 1/(corresponding to half a cycle). In the pinch roll rotation speed NP and equation (4'),
The number of rotations N of the pinch roll when time t is defined as the point in time when the bar 20 comes into contact with the outer cylinder 14 and winding is started, that is, t=0
By using the fact that P is equal, solve for t', and multiplying this by 2 (given by equation 110).

Furthermore, the amplitude A of the rotation speed of the pinch roll 16 is given by the difference between the maximum rotation speed NP1 of the pinch roll 16 and the average rotation speed NP of the pinch roll 16, that is, A=NPM-NP (II), (5 ) is derived as equation (7).

Figure 6 shows (4), (4'), (ll) and (7
) equation, the horizontal axis is time, and the vertical axis is the pinch roll rotation speed N.
This is a graph expressed by taking p.

Of course, the upward-right part of the figure corresponds to equation (4) for the speed-up process, and the downward-right part corresponds to equation (4') for the deceleration process, but the origin of the time axis is the first This is the time when the layer starts to wind, and the time when 1=0 becomes the starting point of each speed increase process and deceleration process.

By changing the pinch roll rotation speed NP according to the formula (4) derived as above, it is theoretically possible to wind the bar 20 in the ideal form as shown in Figure 2. It should be.

However, when the inventors repeated various experiments,
Control based on the above-mentioned theoretical formula could not achieve the desired objective, and it was found that the cause of this was the influence of centrifugal force acting on the bar 20 being wound up.

Considering this centrifugal force, the amplitude A is expressed as shown in equation IV).
It has been found that by correcting the amplitude A to a value smaller than the theoretical value given by equation (7), winding can be achieved in an ideal form.

However, 0<k<1 This value of k was determined based on experiments, and in order to find the optimal value, the value of k was varied within the range of O-1 (4) , (4 ') Pinch roll rotation speed N according to formula
The amplitude A of the fluctuation period of P was set, and the winding height within the reel when a constant length bar was wound onto the reel 10 was actually measured.

Figure 7 shows an example of the results. When k is 0.83, the winding height is the lowest, that is, the bar is wound most densely, the coil filling rate in the reel is the highest, and k =
It was concluded that 0.83 is the optimum correction coefficient.

However, the optimum value of k varies depending on the bar diameter and other various factors, and the desired effect can be obtained substantially within the range of 0.73 to 0.93.

To summarize the method of the present invention described above, while rotating the reel 10, a looper 18 is inserted from the bar rolling equipment between the inner tube 13, which is the inner circumference regulating member, and the outer tube 14, which is the outer circumference regulating member. , 1B, when winding the bar 20 supplied to the reel 10 via the pinch roll into a laminated spiral shape, the number of revolutions NR per unit time of the reel 10 is expressed by the formula (I), NR=V/π.

(ro+ri), and the average value of the rotation speed per unit time of the pinch roll 16 is (II
), the period T is (I
II) T=2 π(ro-ri-a)(
r o + r i) /V・a, and the amplitude A is expressed as (5) A=NP・k・(ro-ri-a)/(ro
This can be done by periodically changing the value so that the value becomes +ri).

Next, specific embodiments of the method of the present invention will be described.

FIG. 4 shows a block diagram of an apparatus for carrying out the method of the present invention shown in conjunction with a polling type bar winder.

In FIG. 4, when the bar 20 is not caught in the roll 15 of the final stand, the speed of a tacho generator or the like is detected by linking the rotation speed information of the roll 15 of the final stand to the roll drive motor 41 of the final stand. The information is detected by the device 42 and input to the arithmetic storage device 43.

The arithmetic storage device 43 calculates the bar speed ■ based on this input information and a bar rolling schedule given in advance, stores this, and also sends information regarding the bar speed ■ to the calculation storage devices 44 and 45, respectively. Output.

In the arithmetic storage device 44, the bar speed {circle around (2)}, the outer radius ri of the inner cylinder 13, and the inner radius r of the outer cylinder 14 are stored.

, based on the outer radius rp of the pinch roll 16 (I), (
The rotational speed NR of the reel 10 and the average rotational speed NP of the pinch roll 16 are calculated by Equation 10, and these are stored, and information regarding the average rotational speed NP of the pinch roll 16 is sent to the adder 46, and information regarding the reel rotational speed NR, The information is output to the control device 48 of the reel drive motor 47.

The arithmetic storage device 45 stores information regarding the bar speed ■, the bar diameter a, the outer radius ri of the inner cylinder 13, and the inner radius r of the outer cylinder 14.
.

, based on the outer circumferential radius r of the pinch roll 16, the fluctuation period T of the pinch roll rotation speed NP is determined by the (Incorporated Foundation) formula, and (
The amplitude A of the pinch roll rotation speed NF is calculated using equation 5), and this is stored and output to the function generator 49.

The function generator 49 determines a waveform as shown in FIG. 6, and inputs a signal corresponding to this waveform to the adder 46.

The adder 46 adds information regarding the average rotational speed NP of the pinch roll 16 inputted from the arithmetic storage device 44 to this waveform and inputs the result to the amplifier 50 , where the amplified signal is applied to the pinch roll drive motor 51 . Speed control device 52
The rotational speed NP of the pinch roll 16 is automatically set and controlled.

Reference numeral 53 in FIG. 4 is a rotational speed control device for the roll drive motor 41 of the final stand, which includes an independent speed control signal SSC for changing and controlling the rotational speed of only the roll 15 of the final stand, and an upstream Successive signal SC from
Motor 41 to which C is input and causes variation in bar speed ■
A gear shift is performed.

Therefore, in order to change the reel rotation speed NR and the pinch roll rotation speed NP by the same ratio as the change rate of the rotation speed of the motor 41 or the roll 15 of the final stand, the signal 5SC2S
The CC is input to the amplifier 50 and its gain is adjusted to control the rotational speed of the reel and the pinch roll to follow changes in the rotational speed of the roll 15 of the final stand.

Furthermore, in the embodiment described above, the number of rotations N of the pinch roll is automatically
Although the case where the rotation speed NP of the pinch roll and the rotation speed NR of the reel are set and controlled has been described, the rotation speed NP of the pinch roll and the rotation speed NR of the reel may be calculated in advance, and the settings may be controlled manually to follow them. .

As described above, in the method of the present invention, regardless of the bar material speed from the rolling equipment and the bar material diameter, it is possible to tightly wind the material onto the reel in an orderly manner, and the reel itself can be wound at the bar material speed. Since the reel can be rotated at a substantially constant rotational speed matched to the reel, the output of the reel driving source can be small, and the equipment cost is correspondingly low and energy saving can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the general configuration of a polling type winding device, Fig. 2 is an explanatory diagram showing the ideal winding state of a bar, and Fig. 3 is a time period of reel rotation speed of the wobbling control method. Figure 4 is a block diagram of a device for carrying out the method of the present invention shown together with a polling type winding device, and Figure 5 shows the process of deriving equations (4) and (4'). Reel plan view to show, Figure 6 C (■), (III
), (Iv), (5), and (6), and FIG. 7 is a graph showing the experimental results for determining the correction coefficient. 10... Reel, 13... Inner cylinder, 14
...Outer tube, 15...Final stand roll, 16...Pinch roll, 18...
・Roopa, 20... Bar material.

Claims (1)

[Claims] 1. While rotating a reel in which an inner circumference regulating member and an outer circumferential regulating member are arranged concentrically, a bar material supplied from the rolling equipment toward the reel is flattened between the inner and outer circumferential regulating members. When winding the spirally wound material into a single layer and winding such layers into a laminated state, a pinch roll is provided between the final stand of the rolling equipment and the reel, and between the final stand and the pinch roll. A looper is provided between them, and the number of revolutions per unit time NR of the reel is set to a constant value given by the following formula (I), while the number of revolutions per unit time of the pinch roll is set to a value whose average value is as follows. Np, expressed by the equation (I[), and the period are changed periodically so that the T1 amplitude, expressed by the equation (I[[), below] becomes A, expressed by the equation (IV) below. A method for winding up a bar, characterized in that the loop of the bar is absorbed by the looper. However, ■ = Bar speed ro at the exit of the final stand: Inner radius ri of outer circumferential regulating member: Outer circumferential radius rp of inner circumferential regulating member: Pinch roll radius a: Bar diameter: Correction coefficient (0<k<1 )