JP3244118B2 - Rolled material elongation detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolled material processing means, such as a temper rolling mill or a tension leveler, which needs to control or monitor the elongation rate of a rolled material. The present invention relates to an elongation rate detection device that detects an elongation rate of a rolled material on an exit side.

[0002]

2. Description of the Related Art In general, an elongation rate detecting device for detecting an elongation rate of a rolled material on an outgoing side with respect to a rolled material on an input side of a rolled material processing means in a rolled material processing means such as a temper rolling mill or a tension leveler includes: For example, a pulse generator is installed on each tension applying roll (bridle roll) arranged on the entrance side and the exit side of the temper rolling mill as the rolled material processing means, and a pulse is generated from each pulse generator to elongate the rolled material. It is supplied to an elongation rate calculator for calculating the rate. The elongation rate calculator counts the number of each pulse supplied from each pulse generator to determine a predetermined section (sampling pitch).
, The feed amount L1 and the feed amount L2 of the rolled material are obtained, and the elongation ε is calculated based on the following equation (1).

Ε = (L2−L1) / L1 × 100 [%] (1)

[0004] As the predetermined section, a predetermined entry side feed length unit or a predetermined time unit is generally used.

[0005] However, when the entrance feed length is adopted as the predetermined section and the elongation is detected for each entry feed length unit, the sampling time becomes longer when the transport speed of the rolled material is low. Would. As a result, the elongation rate calculation pitch (update cycle of the elongation rate detection value) becomes long, and the elongation rate detection is delayed. For this reason, the response to the elongation rate control means for controlling the rolled material processing means and the like based on the output signal (elongation rate detection signal) from the elongation rate detection device deteriorates, and the elongation rate control accuracy deteriorates.

If the section of the infeed length is shortened in order to shorten the sampling time, the number of pulses obtained in the section is reduced and the resolution is lowered, so that the elongation rate calculation accuracy is also deteriorated. .

Also, when a predetermined time unit is adopted as the predetermined section and the elongation rate is set to be detected in the predetermined time unit, when the transport speed of the rolled material is low, the number of pulses to be counted becomes small. Since the resolution is reduced, the accuracy of the calculated elongation percentage value is deteriorated.

On the other hand, in order to improve the delay in elongation rate detection and improve the accuracy of the elongation rate control, for example, Japanese Patent Application Laid-Open No. 64-71511 discloses a method in which the feed length, which is a predetermined section, is reduced. Change control according to the material conveyance speed,
There is disclosed an apparatus for preventing a delay in elongation rate detection. Japanese Patent Application Laid-Open No. 2-127910 discloses an apparatus in which an elongation rate detecting means is configured to have a multi-stage structure to prevent elongation rate detection delay.
In the publication, the elongation rate value calculated by the usual method is stored as needed, and the latest elongation rate value is corrected based on the stored past elongation rate value, thereby improving the elongation rate detection accuracy. Is disclosed.

As the simplest method for improving the elongation rate detection accuracy, a design has been conventionally performed in which the number of pulses per rotation of a pulse generator to be used is made as large as possible and the elongation rate calculation resolution is raised as much as possible. I have.

[0010]

However, as disclosed in Japanese Unexamined Patent Publication No. 64-71511, the feed length, which is a predetermined time, is controlled to be changed so as to be shorter when the transport speed of the rolled material is slow, and the elongation rate is reduced. If the detection delay is improved, the number of pulses counted when the transport speed is low becomes small, and as a result, there is a problem that the elongation rate detection accuracy is deteriorated. According to this method, it is impossible to improve the delay of the elongation rate detection while maintaining the elongation rate detection accuracy, and it is necessary to improve the problem of detection sending within a range where deterioration of the elongation rate detection accuracy is allowed. At rest.

As disclosed in JP-A-2-127910,
In the method of improving the elongation rate detection delay by forming the elongation rate detection means in a multi-stage configuration, the elongation rate detection accuracy is not reduced because the number of pulse counts for the feed length used for one elongation rate calculation is not reduced. Although it is possible to improve the elongation rate detection delay while maintaining the above, it is necessary to prepare a large number of length measurement arithmetic units and elongation percentage arithmetic units to implement this method. In such a case, a large amount of hardware is required, and in the case of realizing with software, the amount of software is large, which leads to an increase in the load on each processing unit, and there is a problem that an investment amount for implementation is expensive. . Further, according to this method, the number of stages of the elongation rate calculator is to be determined on the assumption that the transport speed of the rolled material is low. There is also a problem that the state becomes a state where it is not effectively used.

Further, as disclosed in Japanese Patent Application Laid-Open No. 8-197122, an elongation rate value calculated by a normal method is stored at any time, and the latest elongation rate value is calculated based on the stored past elongation rate value. The method of improving the elongation rate detection accuracy by performing the correction is not enough to improve the elongation rate detection delay, and needs to be used in combination with the other conventional methods described above.

In the method of increasing the number of pulses per rotation of the pulse generator used as much as possible to increase the elongation rate calculation resolution, there is a problem of noise or induction in the transmission of the pulse signal from the pulse generator or the reading of the pulse signal. There is a problem that the pulse frequency is generally limited to about 20 to 30 kHz due to restrictions on specifications on the side. The specifications of a pulse generator generally used are generally up to about 5,000 pulses / revolution, and a detector with a special specification is required in order to secure a resolution higher than that, and the cost becomes extremely high. There's a problem.

FIG. 4 shows a conventional pulse number counting method for elongation rate calculation. Although the pulse generator count waveforms of Case 1 and Case 2 in FIG. 4 are exactly the same, they are shifted by a half cycle, so that in Case 2, one more pulse is counted than in Case 1.

In general, in the conventional method of counting the number of pulses in a predetermined section and calculating the elongation by calculating the feed lengths on the inlet side and the outlet side, as shown in FIG. Even if there is, a reading error of ± 1 pulse occurs depending on the input timing of the pulse from the pulse generator.

For example, as the predetermined section, the entry side feed length 50
Taking the case of equivalent to 00 pulses as an example, since there is an error of ± 1 pulse when reading the feed length, the elongation rate detection error due to the pulse reading error is (± 1/500).
0) × 100 = ± 0.02%. The target value and the allowable range of a typical elongation rate control target are 2.5% ± 0.2%, and even if a section corresponding to 5000 pulses is defined as a calculation section, the elongation rate calculation error (0.02) Is at least 1/10 (0.02 / 0.2) of the allowable range (0.2)
Will occupy. For the purpose of shortening a predetermined section for elongation rate calculation when the transport speed of the rolled material is low, for example, if the pulse count number in this section is equivalent to 2000 pulses, an elongation rate detection error due to a pulse reading error is: (± 1/2000) × 100 = ± 0.05%.

As described above, the conventional method of counting the number of pulses in a predetermined section has a fatal problem that an error occurs in reading the number of pulses, and the elongation rate calculation is performed when the conveying speed of the rolled material is low. Unless accuracy is sacrificed, the predetermined section for elongation rate calculation cannot be shortened.

The present invention has been made in view of the above-mentioned conventional problems, and does not greatly deteriorate the elongation rate detection accuracy even when the rolled material is conveyed at a low speed. An object of the present invention is to provide an elongation rate detection device that can be shortened.

[0019]

According to the present invention, a feed amount of a rolled material at an entrance and a feed amount of a rolled material at an exit side of a rolled material processing means are detected, and the rolled material is detected based on the detected values. In a rolled material elongation rate detection device for detecting an elongation rate of a rolled material on an outgoing side with respect to a rolled material on an incoming side of the processing means, provided at an upstream side and a downstream side of the rolled material processing means, a predetermined feed of the rolled material is provided. A pulse generator for sending a pulse for each amount, a means for receiving an upstream pulse signal, which is a signal from the upstream pulse generator, and measuring a time required to count a predetermined number of pulses; and receiving a downstream pulse signal is a signal from the pulse generator, of the sections is divided by the downstream-side pulse signal, selects the temporally closest section to the given period is divided by the upstream-side pulse signal, Mosquitoes the number of pulses and the number of the pulse in the interval
Means for measuring the time required to unt
The predetermined number of pulses on the flow side and the number of pulses
Time required, pulse count and pulse number on the downstream side
From the time required to count the, the rolling material elongation calculating means for calculating the elongation rate of the outgoing rolling material with respect to the incoming rolling material of the rolling material processing means,
This has solved the above-mentioned problem.

According to the present invention, on the downstream side of the rolled material processing means, a section which is temporally closest to the section divided by the signal from the pulse generator on the upstream side is selected, and the number of pulses in the same section is determined. When it takes to count the number of pulses
During in the so that to measure the predetermined pulse of the resulting upstream
Number and the time required to count the number of pulses, and
The number of pulse counts on the downstream side and the number of pulses
Since the elongation rate of the rolled material is calculated from the time required in the above, it is possible to prevent the deterioration of the elongation rate calculation accuracy due to the pulse reading error which is a main factor of the elongation rate calculation error, and By sufficiently detecting the time required to count the number of pulses, the elongation rate can be detected with much higher accuracy than before.

Thus, even if the pulse count for the feed length used for one elongation rate calculation is smaller than in the past, deterioration of the elongation rate detection accuracy is extremely small, and especially, the elongation rate calculation in a low-speed part is performed. It is possible to make the predetermined section for the length shorter than before.

Further, when a pulse number changing means for changing and controlling the predetermined number of pulses for detecting the required time in accordance with the conveying speed of the rolled material is provided, the change in the elongation rate calculation pitch is kept within a certain range. , It is possible to prevent an excessively short predetermined section in the high-speed section due to the shortened operation cycle at the low speed.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic structural view of a temper rolling mill provided with an elongation detecting device according to one embodiment of the present invention.

In FIG. 1, the temper rolling mill 10 constituting the rolled material processing means includes a draft control device 12, an entrance bridle speed control device 14, and an exit bridle speed control device 16.
Thus, the rolling conditions are controlled, and the rolled material 18 is rolled.
An entrance bridle roll 20 and an exit bridle roll 22 are disposed on the entrance side and exit side of the temper rolling mill 10, respectively. The entrance side bridle roll 20 and the exit side bridle roll 22 are provided with an entrance side pulse generator 24 and an exit side pulse generator 26 for measuring the feed length, respectively.

In order to receive pulse signals generated by the input pulse generator 24 and the output pulse generator 26,
An incoming pulse width measuring device 28 and an outgoing pulse width measuring device 30 are provided. The input side pulse width measuring device 28
The time required to count the number of pulses of a predetermined sampling number given in advance as the elongation ratio calculation pitch from the host computer 32 is measured, and the measurement result is supplied to the elongation ratio operation device 34. Also, the output side pulse width measuring device 30
Sets a section that is temporally closest to the section measured by the input-side pulse width measuring device 28, and measures the number of pulses in the section and the time required to count the number of pulses. The measurement result is supplied to the elongation percentage calculating device 34. The elongation percentage calculating device 34 calculates the elongation percentage using the measurement results supplied from the incoming pulse width measuring device 28 and the outgoing pulse width measuring device 30.

The operation of the present embodiment will be described below.

The number of rotations of the entrance bridle roll 20, which supplies the rolled material 18 to the temper rolling mill 10, is detected by counting the pulses generated by the entrance pulse generator 24, and the feed length on the entrance side is measured. I do. The input-side pulse width measuring device 28 receives the supply of the pulse signal generated by the input-side pulse generator 24, and as shown in FIG. The required time Te [sec] until the number is counted is measured, and the measurement result is supplied to the elongation percentage calculating device 34.

Rolled material 18 rolled by temper rolling mill 10
Is transported by the outgoing bridle roll 22. The feed length at the output side is measured by counting the number of rotations of the output side bridle roll 22 and the pulses generated by the output side pulse generator 26. Outgoing pulse width measuring device 3
0 is supplied with a pulse signal generated by the output-side pulse generator 26, and as shown in FIG. 2, sets an interval that is temporally closest to the interval measured by the input-side pulse width measuring instrument 28, The number of pulses Nd and the time Td [sec] required to count the number of pulses Nd are measured, and the measurement result is supplied to the elongation ratio calculating device 34.

The elongation rate calculating device 34 uses the pulse count numbers Ne and Nd and the times Te and Td supplied from the incoming pulse width measuring device 28 and the outgoing pulse width measuring device 30 to calculate the following equation (2). To calculate the elongation percentage ε.

Ε = (Ne / Te−Nd / Td) / (Ne / Te) × 100 [%] (2)

The calculated elongation percentage value ε is supplied to the elongation percentage controller 36. The elongation rate control device 36 issues a rolling condition change command to the rolling reduction control device 12, the entrance bridle speed control device 14, the exit side bridle speed control device 16 and the like so that the elongation value ε becomes a predetermined set value. Is output to control the elongation.

In the above time measurement, the required time Te,
The measurement resolution of Td needs to be small. For example,
Assuming that the detection resolution of Te corresponding to a predetermined section (sampling pitch) is 1 [μsec], this is the case where the elongation rate calculation cycle is 0.1 [sec] and the elongation rate calculation accuracy is ± 0.00.
1%, which greatly exceeds the limit of elongation rate calculation accuracy by the conventional method.

A command is sent from the host computer 32 to the input-side pulse width measuring device 28, and the pulse count number Ne defining the section for detecting the required time Te is changed according to the transport speed of the rolled material 18. I do. That is, when the transport speed of the rolled material 18 is low, the pulse count number Ne is reduced,
When the transport speed is high, the pulse count number Ne is increased. By doing so, it is possible to prevent an excessively short predetermined section (sampling pitch) in the high-speed section due to a short calculation cycle at a low speed.

FIG. 5 shows, for comparison, three patterns of the relationship between the pulse count number, the elongation rate calculation cycle, and the elongation rate calculation error in the conventional elongation rate calculation. The condition is speed 50
The elongation ratio calculation is performed in the region of ~ 1000 [mpm], and the pulse generator has 0.5556 [mm / pulse].
] Was selected. As shown in FIG. 5, when the elongation rate calculation cycle is 0.667 [sec] at a low speed part, for example, a line speed of 50 [mpm], the elongation rate calculation error is 0.1 [%], and the elongation rate calculation cycle is To 3.333
If the length is set to [sec], the elongation error is 0.02.
[%]. As described above, if the elongation rate calculation cycle in the low speed part is shortened, the elongation rate calculation error increases, and if the elongation rate calculation accuracy is maintained in the low speed part, the elongation rate calculation cycle becomes long.

On the other hand, the relationship between the pulse count number, the elongation rate calculation cycle, and the elongation rate calculation error in one elongation rate calculation by the elongation rate detection device according to the present embodiment under the same conditions as in FIG. FIG. 3 shows two patterns. As shown in FIG. 3, in the present embodiment, the elongation rate calculation errors are extremely small, 0.001 and 0.0002 [%], and the elongation rate calculation cycles at that time are 0.1 and 0.5 [sec], respectively. ]
It can be seen that it is sufficiently short even at low speed.

According to the present embodiment, the elongation rate calculation accuracy and the elongation rate calculation pitch are not significantly affected by the change in the conveying speed of the rolled material. It is possible to shorten the elongation rate update cycle without deteriorating the elongation.

In this embodiment, a temper rolling mill has been described as an example of the rolled material processing means. However, the present invention is not limited to this, and other rolled material processing means such as a tension leveler may be used. For example, the present invention can be applied to any rolled material processing means that requires measurement of the elongation value.

[0039]

As described above, according to the present invention,
It is possible to prevent the deterioration of the elongation rate calculation accuracy due to the pulse reading error, which is the main factor of the elongation rate calculation error, and by sufficiently detecting the time required to count a predetermined number of pulses, Elongation rate detection with much higher accuracy than before has become possible.

Even if the number of pulse counts corresponding to the feed length used for one elongation rate calculation is smaller than in the past, the deterioration of elongation rate detection is extremely small. The sampling pitch can be made shorter than before. Thereby, the responsiveness of the elongation rate control based on the detected elongation rate value can be improved as compared with the related art.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a temper rolling mill provided with an elongation detection device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a pulse width measuring method according to the present invention.

FIG. 3 is a diagram showing a relationship between a pulse count number, an elongation rate calculation cycle, and an elongation rate calculation error in the present embodiment.

FIG. 4 is a diagram showing a pulse counting method according to a conventional elongation rate calculation.

FIG. 5 is a diagram showing a relationship between a pulse count number, a growth rate calculation cycle, and a growth rate calculation error in a conventional growth rate calculation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Temper rolling mill 12 ... Reduction control device 14 ... Incoming bridle speed control device 16 ... Outgoing bridle speed control device 18 ... Rolled material 20 ... Incoming bridle roll 22 ... Outgoing bridle roll 24 ... Incoming pulse generator 26 ... Outgoing pulse generator 28... Incoming pulse width measuring device 30... Outgoing pulse width measuring device 32.

Continuation of front page (56) References JP-A-2-127910 (JP, A) JP-A-6-170444 (JP, A) JP-A-60-180615 (JP, A) (58) Fields investigated (Int) .Cl. ⁷ , DB name) B21B 37/56 G01B 21/32

Claims (2)

(57) [Claims] 1. A feed rate of a rolled material on an inlet side of a rolled material processing means and a feed rate of a rolled material on an output side are detected, and based on the detected values, a rolled material on an input side of the rolled material processing means is detected. In the rolled material elongation ratio detection device for detecting the elongation ratio of the rolled material on the delivery side, a pulse is provided upstream and downstream of the rolled material processing means, and sends a pulse for each predetermined feed amount of the rolled material A generator, a means for receiving an upstream pulse signal, which is a signal from the upstream pulse generator, and measuring a time required for counting a predetermined number of pulses; and a downstream, which is a signal from the downstream pulse generator. Receiving the side pulse signal, from among the sections divided by the downstream pulse signal, select a section that is temporally closest to the predetermined section divided by the upstream pulse signal, and determine the number of pulses in the section and the number of pulses in the section. Pa Required to make the count a scan number
Means for measuring the time elapsed, and counting the predetermined number of pulses on the upstream side and the number of pulses.
Time, and the pulse count and
Elongation rate calculating means for calculating the elongation rate of the rolled material on the outgoing side relative to the rolled material on the incoming side of the rolled material processing means from the time required to count the number of looses, Equipment for detecting elongation of material. 2. The elongation of a rolled material according to claim 1, further comprising pulse number changing means for changing and controlling a predetermined number of pulses for detecting said required time according to a conveying speed of the rolled material. Rate detection device.