JPS59110412A - Method for tracking material in two strand rolling - Google Patents

Abstract

PURPOSE:To perform surely the tracking of a material regardlessly of operating condition in a two-strand-rolling by separating the change of rolling load for each strand to detect it independently. CONSTITUTION:A load separating device 51 calculates separately the rolling load PA, PB of each strand by inputting a load PD at the driving side detected by a load detector 41 placed at the driving side and a load PW at the work side detected by a load detector 42 placed at the work side. A factor arithmetic device 50 calculates the factors K11, K12, K13, and K14 for the device 51 by inputting the distance (l) between the two detectors 41, 42, the distance (lS) between the strands, and the distance (lA) between the detector 41 and the strand situated at the driving side. A material recognizing device 52 inputs the loads PA, PB to detect the biting and running out of a material to be rolled by using on-levels W1, W2 set previously for each stand as the threshold levels. Further, signals QA, QB are outputted while rolling the strands independently to a control device 53 basing on the detected results.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a method for tracking a rolled material when rolling a steel bar or wire rod by two-strand 1' rolling.

(Technical Background of the Invention) Fig. 1 is a diagram showing a state in which two-strand P rolling is performed at °C. A series of rolling mills is equipped with a number of stands, and each stand P has rolling rolls '52s3t4,
5 is installed, and the rolled materials 21, 22° 31, 32 are 2
It is rolled while passing through two strands. Also, material detectors 11 and 12 for detecting the material position of the rolled material
is provided for each strand P. In this type of rolling, the material to be rolled passes randomly for each strand, so if you want to control the tension between stands, for example, it is necessary to check whether or not the material to be rolled is being rolled in each stand. Because of the need for detection, the rolled material must be tracked by strand.

For this reason, conventionally, rolling conditions have been tracked using rolling load signals detected by load detectors provided in each rolling mill. FIG. 2 is a block diagram showing a conventional material tracking method.

For convenience of explanation, the strands from the drive side are in row A.
The other strand will be referred to as row B. On the entrance side of the stand, material detectors 11 and 12 are provided for detecting the leading and trailing ends of materials corresponding to rows A and B.

Further, a drive side load detector 41 and a work side load detector 42 are provided on both sides to detect the magnitude of the rolling load that changes when the material to be rolled is bitten and pulled out. Both detectors 41 and 42
The detected loads are added by an adder 43 and output as a stand load P1. This stand load P
1, the leading and trailing ends detector 44 detects the leading and trailing ends of the material to be rolled.

The outputs of the material detectors 11 and 12 and the leading and trailing edge detectors 44 are inputted to a material position detecting device 45, and the pressure-filled material is tracked.

FIG. 2 (Bl is a timing chart showing the operation of the conventional tracking method. The tip of the A-pierced rolled material 21 reaches the material detector 11 at t□, and reaches the first stand at timing t3. The tail end of the rolled material 21 is at timing t.
It reaches the material detector 11 at timing t7 and reaches the first stand at timing t7.

Similarly, the tip of the 8-row rolled material 31 reaches the detector 12 at timing t2, and reaches the first stun r at timing t4.

Further, the tail end reaches the detector 12 at timing t6,
It reaches the first stand at timing t8.

The material position detection device 45 memorizes that the A-pierced rolled material 21 has reached the material detector 11 at timing t0, and stores that the 8-row rolled material 31 has reached the material detector 12 at timing t2.

Next, the A-pierced rolled material 21 reaches the first stand at timing t3, and when the rolling load P1 of the first stand reaches a preset first load value 71 or more, the leading and trailing end detector 44 outputs a biting signal. 0 is output to the material position detection device 45 for a certain period of time. When the material position detection device 45 inputs the machining into the biting signal, the biting signal indicates that 1 is A based on the passing order of the rolled material at the material detectors 11 and 12 positions.
It is determined that it is a biting signal of the punched rolled material 21, and a signal indicating that the A punched rolled material 21 in the first stand is being rolled is turned on.

At timing t4, the 8-row rolled material 31 reaches the first stand, and when the first stand rolling load gate □ reaches the preset second load value 72 or more, the leading and trailing end detectors 4
4 is a material position detection device 45 which inputs 2 to the biting signal for a certain period of time.
Output to. The material position detection device 45 receives the biting signal by
Then, in the same procedure as described above, it is determined that this biting signal 2 is the biting signal of the 8-row rolled material 31, and a signal indicating that the 8-row rolled material 31 in the first stand is being rolled is sent. Turn on.

Next, when the A-row material detector 11 is turned off at timing t5, the material position detection device 45 remembers that the tail end of the A-pierced rolled material 21 passes the position of the material detector 11, and at timing t6, the 8-row material detector 11 is turned off. When the detector 12 is turned off, the material position detection device 45 detects that the tail end of the 8-row rolled material 31 is detected by the material detector 1.
Remember that you have passed position 2. Furthermore, when the tail end of the A-pierced rolled material 210 is pulled out of the first stand r at timing t7, the leading and trailing end detector 44
For ash removal, the signal N□ is sent to the material position detection device 45 for a certain period of time.
Output to.

When the material position detecting device 45 inputs the signal N□ for ash removal, the ash removal of the rolled material at the material detector 11 and 12 is performed from the order in which the signal N0 is A. It is determined that it is a signal, and the A punched rolled material 2 at the first stand is
The signal indicating that No. 1 is being rolled is turned off. Further, at timing t8, when the 8-row rolled material 31 passes through the first stand and the first stand rolling load P□ becomes less than the preset first load value v□, the leading and trailing edge detectors 44 The signal N2 is output to the material position detection device 45 for a certain period of time.

When the material position detection device 45 inputs the bottom removal signal N2,
The material detectors 11 and 12 determine that the bottom removal signal N2 is the signal for bottom removal of the 8th row of rolled material 31 based on the order of the ash removal of the rolled material at the positions of the material detectors 11 and 12. The signal indicating that the rolled material 31 is being rolled is turned off.

Through these five operations, the material to be rolled in the first stand is tracked. 2nd stand P1 located downstream from the 1st stand 3rd stand... By using the signal that the material is being rolled in the stand located upstream from the stand as the detection signal of the material detector, the above-mentioned A similar operation is used to track the rolled material.

(Problems in the background art) In this way, the conventional material tracking method uses the on-level when one rolled material is being rolled and the on-level when two rolled materials are being rolled for the rolling load signal at each stand. The on-level of each strand is set in advance, and bite is determined when the on-level is exceeded, and tail-off is judged when the on-level is below the on-level. I try to decide whether to give up or not based on logical judgment.

Therefore, with conventional material tracking methods, depending on the operating conditions, material tracking may become impossible and various controls may not be possible.

Specifically, material tracking becomes impossible in the following cases.

(In the 11G stand, when the rolled material of one strand ashes out and the rolled material of the other strand gets caught at the same time.

(II) When the rolled materials of both strands are bitten at the same time in each stand.

(Il+1 When the rolled material of both strands falls off at the same time in each stand.

(iv) When the rolling load when one rolled material is being rolled in each stand is smaller than the first on-level set in advance.

(■) When the rolling load when rolling two pieces of material to be rolled in each stand is smaller than the second on level set in advance.

(VD When the rolling load when rolling one material to be rolled in each stand is higher than the preset second on level.

Next, regarding the case (1) above, see Figure 3 (a).
Explain using. FIG. 3(a) shows a case where the end of the rolled material 31 and the jamming of the rolled material 31 occur simultaneously in the stand 4. FIG. 3(b) shows a timing chart in that case. At timing t3□ in stand 4, the A-pierced rolled material 21 falls out,
At timing t3□, the end of the 8th row rolled material 31 and the jamming of the A punched rolled material B occur simultaneously, and at timing '33, the 3rd row rolled material 32 becomes jammed. timing t
When the rolling load P4 falls below the second on level ■24 due to the A piercing rolled material 21 slipping out at 3□, the A row rolling signal of the stand 4 is turned off.

Next, at timing t3□, when the rolled material 31 falls out and at the same time the rolled material η is jammed, the rolling load P
4 does not reach the first on level v14 or below maf,:c the second on level 724 or higher, so neither the signal ' nor the biting signal is output for tail removal, and originally the A row rolling signal would be on and B A situation arises in which the rolling signals for both strands do not change even though the row rolling signal should be turned off.

Next, at timing '33, the material to be rolled 32 is bitten and the rolling load P4 becomes equal to or higher than the second on level 724, so a biting signal is output and the A-row rolling signal is set.

In this way, in the case of (1) described above, it is impossible to track the rolled material using the conventional material tracking method.

Similarly, in the case of (11) or (iil), the biting signal or tail removal becomes impossible to track because the signals overlap on both strands, and in the case of (1v), (V), and (vl), the Two rolling loads are used to set two on-levels to judge whether or not the rolled material passing through both strands is jammed or pulled out, so the load when one rolled material is rolled is the first one. Material tracking is not possible unless there is an intermediate point between the on-level and the second on-level.

In addition, in the case of one-strand rolling, it is sufficient to set a relatively small load as the on-level, but in the case of two-strand rolling, two on-levels are required. '＠It is very difficult to set the on-level because the rolling load must be set to be higher than the rolling load when rolling one piece and less than the rolling load when rolling two pieces. It had the following drawback.

- Tracking of the rolled material is essential when performing automatic control using a force calculator, such as tension control between stands. Therefore, in order to reliably track the rolled material, it was necessary to take measures such as limiting the number of operations and changing the on-level every time the rolling schedule was changed.

This placed significant operational constraints and placed a heavy burden on operators. In addition, as user demands for products are becoming increasingly strict, automatic computer control is required even in two-strand rolling, so a method is needed that can reliably perform material tracking, which is the basis of this, regardless of operating conditions. It had become.

(Object of the Invention) An object of the present invention is to provide a method that can reliably perform material tracking in two-strand rolling regardless of operating conditions.

(Summary of the invention) In order to achieve the above object, this invention has two strand P
Rolling load P on the r live side and work side in each stand of the rolling mill. , Pw are detected, and a desired coefficient calculation is applied to these detected values to determine the rolling loads Pχ, Pw for each strand.
i is calculated, and when the rolling loads Pχ and P'8 exceed a predetermined level, a biting signal for the rolled material is output, and when it falls below the predetermined level, an ash removal signal for the rolled material is output. It is characterized by outputting.

(Embodiments of the Invention) FIG. 4 is a schematic diagram of an apparatus for carrying out the material tracking method according to the present invention.

The part surrounded by the chain line in the figure shows the configuration for implementing the material tracking method according to the present invention.

The load separation device 51 inputs the P live side load PD detected by the drive side load detector 41 and the work side load Pw detected by the work side load detector 42, and calculates the individual strand load P.
Calculate A and PB.

The coefficient calculation device 50 calculates the distance t between the two load detectors 41 and 42, the distance ts between the strands 271, and the distance tA between the drive side load detector 41 and the strand from the r live side.
Input 0□ for the coefficient for the load separation device 51, □2. Calculate 2□ and 2□.

The material recognition device 52 inputs the loads PA and PB, and detects the biting of the rolled material and the removal of ash from the rolled material using on-levels W1 and W2 set in advance for each strand as a threshold level.

Further, based on the detection result, a strand-specific rolling signal QA e QB is output to the control device 53 .

In this invention, we have focused on the fact that there is a difference in the detected load of the load detectors installed on both sides depending on the position of the rolling roll and both strands in each stand, and calculate the rolling load for each strand from the detected loads on both sides, and calculate the rolling load for each strand from the detected loads on both sides. The aim is to track materials using

FIG. 5 is a diagram showing the relationship between the rolling load for each strand and the detected load on both sides in two-strand P rolling. As is clear from this figure, the detected loads PD and Pw are shown below (
It appears as shown in equations 1) and 2).

However, PD Ni drive side detection load Pw: Work side detection load PA Ni drive side)' Rose strand rolling load PB: Work side strand rolling load t: Distance between both side load detectors tA: r Live side P load detector Distance ts between strands closer to Karage Live Sane R: Distance between both strands P From formulas (1) and (2), both strands P rolling loads PA, PB
can be calculated using equations (3) and (4) shown below.

However, the coefficient is 111 k12 $ k21 ) k2□
are shown by the following equations (5) to (8). Here, the distance Z * tA and odor are set by the operator, input from a detector attached to the rolling mill, or set from a host computer. In general, the adjustment of the horizontal line is done very precisely, so (3) and (4)
) The error in calculating the strand P field extension load by the formula is rarely a problem in practice.

Next, the operation of the apparatus shown in FIG. 4 will be explained. The coefficient arithmetic device 50 calculates the distance of 1.1A after roll change or
and tS, calculate the coefficients □□, □2 j k21 j k2゜ according to equations (5) to (8),
It is output to the load separation device 51. Rolled material 21 or 31
When it bites into the rolling roll 1, the load separation device 51 inputs the loads PD and Pw detected by the drive side load detector 41 and the workpiece side load detector 42, and performs (3) and (4).
The rolling loads P and PB are calculated using the formulas and output to the material recognition device 52.

The material recognition device 52 recognizes both strand r rolling loads PA.

P is input, and when the load PA exceeds the preset drive side ON level W1, the drive side strand P rolling signal QA is turned on, and when the P live side ON level W□ or lower, the signal Q is turned on. When the rolling cart PB exceeds the preset work side on level W2, the work side strand rolling signal QB is turned on, and when the work side on level falls below W2, the signal QB is turned off. do.

FIG. 6 is a time chart for explaining the operation of the device shown in FIG. 4. At timing t6□, the rolled material 21 is caught in the strand closer to the drive side (hereinafter referred to as row A), and at timing t6□, the rolled material 31 is caught in the strand closer to the workpiece side (hereinafter referred to as row B), and at timing '63 DeA
FIG. 6 shows a timing chart in the case where the piercing rolled material 21 bottoms out and the third row rolled material 31 bottoms out at timing '64.

If PA□ is the true rolling load of the A-pierced rolled material 21 at timing t6□, the detected loads PB□ and Pw will be expressed by the following equations (9) and (10).

However, P: Drive 1 side detection load at timing t61 PWI: Work side detection load at timing die 6□ P: A piercing pressure 1 at timing die 6□ Rolling load for rolled material 21! , Distance tA between two side load detectors: Distance from the drive side load detector to the drive side strand.Detected load PD□ at this timing t6□.

The rolling load calculation value p'A1 for each strand is calculated by the load separation device 51 from Pw□. p W , is (3
) to (8), the following equations (11) and 0 are obtained.

”'AI=PA1 °−°−°−°(IυPki1=0...Song/αRiko timing t6
At □, the A-row rolling load calculation value Pχ1 becomes equal to or higher than the A-row on level W□, so the A-row rolling signal QA changes from OFF to ON.

On the other hand, since the B row rolling load calculation value P'B0 is zero, the B row rolling signal QB remains off.

Next, at timing t6□, when the third row rolled material 31 bites, the detected load PD2 j PW2 is calculated by the following (13) and α
The equation (a) is obtained.

PD2=Tom-PA2+ '””””’-PH1・
...(t3)1 1 PW2=i・PA2""""PH1""...(14)1
PD□: r live side r detection load 2w2 at timing t6□: work side detection load at timing t6□ PA2: rolling load of the manually rolled material 21 at timing t6□ PB□: B piercing rolling at timing t6□ Material 31 rolling load t8 Distance between two runs r Detected load at this timing t6□ PD2jPw2
The rolling load calculation value Pχ11''B2 for each strand calculated by the load separation device 51 is calculated as shown in the following α9 and equation (16) using equations (3) to (8).

"A2=PA2-・=05)P'B2=P
B□ ・・・・・・・・・ (16) At this timing t6□, the A row rolling load calculation value Pr2 is equal to or higher than the A row on level W□, so the A row rolling signal QA remains on. .

On the other hand, since the B row rolling load calculation value "B2" is equal to or higher than the B row on level W2, the B row rolling signal QB changes from OFF to ON.

Furthermore, when the A-pierced rolled material 21 falls off at timing t63, the detected load PD3. Pw3 is calculated by (17) and (18) shown below.

However, PD3: R live side detected load at timing '63 2w3: Work side detected load at timing '63 PH3: B punched rolled material 31 rolling load at timing t63 Detected load at this timing t63 PD3゜2w3
The rolling load calculation value PSea m ”B3 for each strand is calculated by the load separation device 51 using (3) to (
Using equation 8), calculations are performed as shown in the following α and equation (2o).

×(55・PH3) Pχ3=0 ・・・・・・・・・ OIP′B
3=PB3 ...... (20) At this timing '63, the A row rolling load calculation value P'A3 is below the A row on level W□, so the A row pressing signal QA is activated.
goes from on to off. B row rolling load calculation value Pt3 is B
Since the row on level W2 is higher than the row on level W2, the B row rolling signal QB remains on.

Finally, at timing '64, when the third row rolled material 31 bottoms out, the detected load PD4. Since Pw4 is zero, the strand-specific rolling load calculation value Pχ41''B4 calculated by the load separation device 51 is also zero.

Therefore, both strand rolling load calculation values are on level W
□, W2 or less, the A-row rolling signal QA remains off, and the B-row rolling signal QB changes from on to off.

FIG. 7 shows a timing chart of material tracking when the present invention is applied to the example shown in FIG. 3, which was impossible to track using conventional material tracking methods. In this example, at timing t3□, the A-pierced rolled material 21 comes out, and at the timing t3□, the B-pierced E rolled material 31 comes out, and at the same time, the A-pierced rolled material 4 bites, and at timing t33, the 8 rows are covered. This shows a case where the bottom of the rolled material 32 has fallen off.

In this case, even in the case where the slip-out and the biting occur simultaneously at the timing t3°, the material can be reliably tracked by using the rolling loads of both strands calculated by the load separation device 51.

In addition, the on-levels W□ and W2 of both strands can be set independently, and a relatively small load value can be set, making it impossible to track the material using conventional methods (11), (tllll, ( 1■), (v)
Materials can be tracked even in the case of Furthermore, (vl) does not occur (because it becomes possible to track materials regardless of operating conditions).

Note that the coefficient calculation device □□□, the load separation device 51, and the material recognition device 52 can be configured as independent calculation devices, but they can also be realized by a computer having the functions of these three devices.

(Effects of the Invention) As explained above in detail based on the embodiments, this invention is configured to detect changes in rolling load for each strand separately, so material tracking in two-strand rolling can be adjusted to operating conditions. This can be done reliably regardless of the situation.

Therefore, there is an advantage that operating conditions can be freely set without placing a burden on the operator as in the conventional case.

[Brief explanation of drawings]

Figure 1 shows the state of two-strand rolling, Figure 2 (a)
is a block diagram for realizing the conventional material tracking method, FIG. 2(b) is a time chart to explain its operation, and FIG. 3(a) is a diagram for when tracking is not possible with the conventional material tracking method. 3(b) is a time chart, FIG. 4 is a block diagram for realizing the material tracking method according to the present invention, and FIG. 5 is a diagram showing the rolling load and detected load for each strand in two-strand rolling. FIG. 6 is a time chart for explaining the operation of the material tracking method according to the present invention, and FIG. 7 is a time chart when the present invention is applied to a case where material tracking was conventionally impossible. 1.2, 3, 4, 5...Rolling stand (with rolling rolls 11, 12...Material detector, 21, 22, 31
, 32... Rolled material (material), 41... Drive side load detector, 42... Work side load detector, 43.
... Adder, seal... Lead/rear end detector, 15... Material position detection device, 50... Coefficient calculation device, 51... Load separation device, 52... Material recognition device, 53...・Automatic control device. Question 6 Agent Kiyoshi Inomata Figure 2 (α) Figure 2 (1)) Figure 3 (α) Material R position detection device output

Claims (1)

[Claims] 1. Rolling load P on the drive side and work side in each stand of the 2-strand P rolling mill. , Pw are detected, respectively.
The detected values are subjected to desired coefficient calculations to calculate the rolling loads P'A and P'B for each strand, and the rolling loads Pλ,
Two strands characterized in that when P'B exceeds a predetermined level, a signal for biting of the material to be rolled is output, and when P'B goes below the predetermined level, a signal is output for removing the end of the material to be rolled. Material tracking method in rolling. 2. A method for tracking material in two-strand rEE rolling according to claim 1, characterized in that the desired coefficient calculation is given by the following formula. (However, tS is the distance between the strands, t is the distance L between the detectors provided on both sides, and tA is the distance between the drive side detector and the strand P closer to the drive side)