JPH0929330A - Control method for laying head tip position - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent interference by other number of revolution control by controlling while adding/subtracting the correcting constant corresponding to deviation from a target region to a laying head lead rate when a tip of wire rod is not fallen in the target region at consecutively executing arithmetic operation three times or more. SOLUTION: A wire rod 3 rolled with a finish rolling mill 1 is supplied to a chain conveyer 15 by a laying head 2. A pulse variation quantity between position scannings of a pulse oscillator 8 of finish rolling mill 1 is inputted in a position control device 11. A pulse variation quantity between position scannings of a pulse oscillator 10 of the laying head 2 is inputted in the control device 11. The control device 11 operates difference in both (lead rate) moment by moment, the result is applied to a next rolling. There is the case the correct lead rate is not obtained after several operations due to interference resulting from other revolution number control. At this case, by confirming a tip position 13 of wire rod 3 discharged from the laying head 2 and by adding/subtracting a correcting constant to the lead rate, the tip position control is executed with the corrected lead rate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of controlling a leading end position of a laying head for forming a wire rod after rolling into a coil shape.

[0002]

2. Description of the Related Art There are two types of wire rod winding machines used in the conditioning process of wire rod rolling equipment: a poling type and a laing type. The raying type has a fixed frame for a wire rod discharged from a laing head (rotating cone). There are a take-up type for winding up and a loading type for spirally developing on a chain conveyor instead of a fixed frame. The laying head is rotating at a speed corresponding to the speed of the rolled wire rod so as to discharge the wire rod into a predetermined coil shape.

In the above-mentioned loading type equipment, as shown in FIG. 5, a chain conveyor 15 is provided on the exit side of the laying head 2, and an air cooling hole 16 is provided on the moving surface of the chain conveyor 15. is there. This chain conveyor 15 receives the wire rod coil 13 discharged from the laying head 2 and conveys the wire rod coil 13 forward, and the wire rod coil 13 on the chain conveyer 15 is cooled during the conveyance by the wind blown from the air cooling hole 16 and has physical properties. Is adjusted.

In the case of the loading type, the coil shape at the tip of the wire may be significantly disturbed depending on where on the chain conveyor the tip of the wire discharged from the laying head falls. That is, if the tip end of the wire rod falling on the chain conveyor is oriented in the moving direction of the chain conveyer, the tip end of the wire rod hits the air-cooling hole 16 during conveyance, and the coil shape at the tip end of the wire rod is significantly disturbed. In order to prevent this, an operator is attached to the exit side of the raying head to correct the tip position of the wire on the chain conveyor. In order to avoid this work performed in a bad heat and heat environment, mechanical tip position control of the wire rod ejected from the raying head (raying head tip position control)
Has been done.

As an example of the conventional position control method of the leading end of the raying head, the tip of the wire rod discharged from the raying head is maintained by keeping the ratio of the number of revolutions of the rolling mill and the number of revolutions of the corresponding leg head constant. Is always controlled so as to fall in a designated area on the chain conveyor. Hereinafter, the ratio of the rotation speeds will be referred to as a lead rate (raying head lead rate).

The above-mentioned method for controlling the leading end position of the flying head calculates the lead rate for each of the rolled or rolled sheets having a fixed table value depending on the size or linear velocity, the final finishing key stand, and the like. By applying the calculated value to the rolling of the next material of the same lot, more accurate control of the leading end position of the leading head was performed. Specifically, as shown in FIG. 1, one scan of the pulse transmitter 8 of the finishing rolling mill 1 (sampling time msec)
The ratio (lead rate) between the pulse change amount during the scanning and the pulse change amount during one scan of the pulse oscillator 10 of the laying head 2 is calculated every moment by the position control device 11, and this calculated value is calculated for the next material. Applies to rolling. That is, the lead rate (α _LH ) is calculated by the following equation.

[0007]

[Equation 1] Here, D _LH : Raying head diameter P _LHR : Number of pulses per revolution of the laing head K _F : Wire rod travel distance per pulse of finishing rolling mill ΔP _LH : Amount of variation of raying head pulse during 1 scan ΔP _F : 1 scan Variation of finishing mill pulse between

Now, as shown in FIG. 2, the tip of the wire 3 is finished.
The tip of the wire rod when it is at the lm position from the exit side of the upper rolling mill 1
The predicted drop position (°) is the lead rate calculated by the above formula (1).
(Α _LH) By substituting) into equation (2) below
Can be. The drop of the wire rod tip obtained from the calculation result of Eq. (2)
Determine whether the lower predicted position (°) is in the target area
The lead rate (α
_LH) Is corrected. Corrected lead rate (α_LH)
Increase or decrease the number of revolutions of the laying head motor 9
Position the tip of the laying head so that the tip of the material falls in the target area.
Position control. From the exit side of the finishing rolling mill, the current wire rod
For the tip position (lm), count the pulses of the finishing mill.
To detect.

[0009]

[Equation 2] Where θ _LH : Predicted drop position (°) L: Length from exit of finishing mill to discharge port of heading head (m) l: Current position of wire rod tip from exit of finishing mill (m)

Therefore, in this method of controlling the leading end position of the leading head, the leading end position control of the leading head is not performed during the rolling of the first wire rod of the same lot, and the lead rate (α _LH ) is calculated by the equation (1), When the wire rod is rolled, the number of revolutions of the raying head is controlled by equation (2) based on this lead rate (α _LH ) to control the tip position of the raying head.

[0011]

In the above-mentioned method of controlling the leading end position of the flying head, the lead rate is continuously calculated. That is, since the lead rate calculation is repeatedly performed by the same calculation formula, the rotation speed of the finishing rolling mill and the laing head fluctuates remarkably due to interference of other rotation speed control, etc., and the rotation speed is stabilized. In a wire rod rolling facility having almost no time zone, the correct lead rate cannot be obtained no matter how many times the lead rate is calculated, and even if the number of times of rolling is repeated, it is not possible to perform highly accurate control of the leading head tip position.

The present invention has been made to solve the above-mentioned problems. The lead ratio is obtained for a plurality of rollings from the beginning of the same lot, and the leading position of the leading head is controlled by this lead ratio. If it is not satisfactory, check the tip position of the wire discharged from the laying head and correct it by adding or subtracting a correction constant to the lead rate so that the tip of the wire falls in the specified area on the chain conveyor. A method of controlling the position of the leading end of the wire head, which controls the position of the leading end of the wire head with the corrected lead rate, so that the leading end of the wire rod discharged from the head is dropped to a designated area on the chain conveyor. With the goal.

[0013]

The gist of the present invention is to calculate the raying head lead ratio for each rolled wire rod,
This calculated value is used to predict the tip drop position of the next rolled wire rod, and in the method for controlling the tip position of the leading head, which is performed by increasing or decreasing the number of revolutions of the leading head so that the tip position of the wire rod falls within the target area, If a correct flying head read rate cannot be obtained after repeating the calculation three times or more, a correct flying head can be obtained by adding or subtracting a correction constant depending on the deviation from the target area to the obtained flying head read rate. This is a method for controlling the leading end position of a rolling head, in which the leading end position of a rolled wire rod is controlled using the leading head lead ratio matched to the lead ratio.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION From the first lot of the same lot, the lead ratio is calculated from the number of revolutions of the finishing rolling mill and the laying head to control the position of the leading end of the laying head. Due to interference or the like, the rotation speeds of the finishing rolling mill and the laing head fluctuate, and as shown in FIG. 3, the wire rod 3 discharged from the laing head 2 is moved to a designated area, that is, the tip end position 6 of the wire rod. It may not be possible to fit in the target area 4. In this case, in order to immediately stop the calculation of the lead rate and correct the current incorrect lead rate, a correction constant empirically obtained from the wire rod tip drop position 6 is added to or subtracted from the lead rate. This corrected lead rate is applied to the leading edge position control of the rolling of the next material. It should be noted that the correction of the read rate is repeated three or more times in succession, and the case where the correct reading head read rate cannot be obtained is one aim.

Further, even in the rolling of the next material, when the wire rod tip drop position 6 is in the non-target area 5, the lead constant is further added and subtracted so that the wire rod tip drop position 6 falls within the target area 4. Match the lead rate to. In this way, the lead constant is repeatedly corrected by adding and subtracting the correction constant until the wire rod tip drop position 6 falls within the target area 4. When the correct lead rate is obtained, the addition and subtraction of the correction constant are stopped, and the lead rate applied to the subsequent rolling of the same lot is
This correctly adjusted lead rate is fixed and used.

According to the present invention, as described above, since the head position of the flying head is controlled on the basis of the flying head lead rate which is adjusted to the correct reading rate by adding / subtracting the correction constant to / from the flying head lead rate, other rotational speeds are used. Even if interference of control is received, it is possible to control the position of the leading end of the raying head with high accuracy, and the position 6 of dropping the leading end of the wire rod can be contained in the target area 4.

Further, when the wire rod tip drop position 6 is in the target area 4 by using the lead rate obtained from the first lot of the same lot by the above-described lead rate calculation method, the lead rate is regarded as correct and the calculation is sometimes performed. Continue every moment. However, when the wire rod tip drop position 6 is in the non-target area 5, as described above, the correction constant is added to or subtracted from the read rate in order to stop the calculation of the read rate and correct the read rate.

[0018]

The present invention will be described in more detail below with reference to specific examples of the present invention. In the method for controlling the leading end position of the raying head of the present invention, the lead rate (α _LH ) is calculated from the first lot of the same lot at the time of rolling the wire rod by the equation (1). Then, the same calculation is continued until the third line. The lead rate (α _LH ) obtained by the calculation is substituted into the above equation (2), the lead rate (α _LH ) is corrected, and the leading end position control of the flying head is performed.

As shown in FIG. 4 (a), when the tip position 6 of the third wire rod falls within the target area 4 within ± x ° of the target drop position 12, the leads of the fourth and subsequent wires are read by the equation (1). Rate (α
_LH ) is calculated continuously, and the lead rate (α _LH ) is calculated for each line.

However, as shown in FIG. 3B, the wire rod tip drop position 6 deviates from within ± x ° of the target drop position 12 due to factors other than the controlling of the head position of the raying head after the fourth line, and the non-target area 5 In the case of, the lead rate (α _LH ) is added / subtracted by a correction constant of ± u% so that the wire rod tip drop position 6 falls within the target area 4. If the wire rod tip drop position 6 does not fall within the target area 4 even if ± u% is added or subtracted, addition / subtraction of ± u% is continued until the wire rod tip fall position 6 falls within the target area 4. When the wire rod tip drop position 6 falls within the target area 4, the obtained lead rate (α _LH ) is fixed and used for rolling the same lot.
That is, (1) when the read rate by calculating (alpha _LH) showed an incorrect value of the return to the correct read rate (alpha _LH) by addition and subtraction of ± u% of the correction constant, the lead rate (alpha _LH )
Is fixed and used.

In the embodiment, when the wire rod tip drop position 6 deviates from the target drop position 12 by ± 30 ° or more, a correction constant of ± 0.5% is added to or subtracted from the lead rate (α _LH ) to obtain ± 16 to 29. °
If it is out of the range, the correction constant of ± 0.25% is added to or subtracted from the lead rate (α _LH ), and if it is less than that, the correction constant is not added or subtracted and the read rate (α _LH ) calculated by Eq. Used as is.

This will be described with reference to FIG. 1. From the time when the tip of the wire rod 3 passes through the finishing delivery side rolling mill of the finishing rolling mill 1, the pulse transmission attached to the finishing rolling mill motor 7 of the finishing rolling mill 1 is started. The lead rate (α _LH ) calculated by the equation (1) by the position control device 11 is calculated by the equation (2) based on the pulse from the pulse generator 10 attached to the vessel 8 and the flying head motor 9 of the raying head 2. If the predicted drop position of the wire rod tip obtained by substituting, calculating, and correcting is more than ± 30 ° from the target drop position 12, the lead rate (α _LH ) obtained by the actual pulse ratio
Add / subtract a correction constant of ± 0.5% to and calculate the wire rod tip drop predicted position again using equation (2), and apply it to the rolling of the next material. When the predicted drop position of the wire rod tip deviates from the target drop position 12 by ± 16 to 29 °, a correction constant of ± 0.25% is added or subtracted. By performing such an operation, it is possible to match the lead rate (α _LH ) obtained by the actual pulse ratio, which is likely to be interfered by other rotation speed control, with the appropriate lead rate (α _LH ).

The actual position of the wire rod tip drop position 6 is taken into the position control device 11 by the number of pulses of the pulse generator 10 of the raying head. That is, a pulse oscillator of 450 pulses per revolution and a pulse oscillator of 1 pulse per revolution are coaxially attached to the laying head motor 9, and once the pulse of the pulse oscillator of 1 revolution per pulse is output, the pulse is temporarily output. The number is reset, and one rotation is performed from the time of resetting to the time of discharging the tip of the wire rod 4
The number of pulses transmitted by the 50-pulse pulse generator is detected, and the wire rod tip drop position 6 is confirmed by the number of detected pulses.

Therefore, the correction constant of ± u% is a numerical value preliminarily provided in the position control device 11 rather than being instructed to the position control device 11 from the outside each time.
The decision to use this value is strictly for the target drop position of the previous material.
It depends on the actual result of the wire rod tip drop position 6 with respect to 12. Further, the position control device 11 uses the read rate (α _LH )
Predicting and calculating the wire rod tip drop position 6 of the current rolled material,
Lead rate (α _LH ) so that it approaches target drop position 12
Is to correct. That is, the position control device 11 controls the leading end position of the flying head by increasing or decreasing the number of rotations of the leading head motor 9 so that the wire rod leading end drop position 6 is within the target area 4.

[0025]

As is apparent from the above description,
According to the present invention, when the operation is repeated three times or more and the correct reading head read rate cannot be obtained,
Since the head position of the head of the flying head is controlled using the correct reading head lead rate corrected by adding or subtracting the correction constant, the position where the wire rod tip falls falls within the target area without being affected by the interference of other speed control. be able to.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a method of controlling a leading end position of a raying head.

FIG. 2 is a reference diagram for lead rate correction.

FIG. 3 is an explanatory diagram of a predicted drop position at the tip of the wire.

FIG. 4 is an explanatory diagram of the embodiment, in which (a) is a wire rod tip drop position in a target area and (b) is a wire rod tip drop position in a non-target area.

FIG. 5 is a schematic explanatory diagram of a loading type equipment of a laing type winder.

[Explanation of symbols]

1 ... Finishing rolling mill, 2 ... Raying head, 3 ... Wire rod, 4 ...
Target area, 5 ... Non-target area, 6 ... Wire rod tip drop position, 7
... Finishing mill motor, 8 ... Pulse oscillator, 9 ... Raining head motor, 10 ... Pulse oscillator, 11 ... Position control device,
12 ... Target drop position, 13 ... Wire coil, 14 ... Wire tip detector, 15 ... Conveyor, 16 ... Air cooling hole.

Claims (1)

[Claims] 1. A laying head lead ratio (ratio of the number of revolutions of the finishing rolling mill and laying head) is calculated for each rolled wire rod, and the calculated value is used to predict the tip drop position of the next rolled wire rod. , In the method of controlling the position of the leading end of the flying head, which is performed by increasing or decreasing the number of revolutions of the flying head so that the drop position of the wire rod tip falls within the target area, the calculation is repeated three times or more in succession to obtain the correct leading rate of the leading head. If not, add or subtract a correction constant depending on the deviation from the target area to the obtained head leading rate, and use the heading lead rate adjusted to the correct heading lead rate to obtain the tip of the rolled wire rod. A method for controlling a leading position of a leading head, which is characterized by controlling a falling position.