JPS5970421A - Method for tracking rolling material - Google Patents

Abstract

PURPOSE:To improve tracking accuracy, by calculating the coil diam. of a rolling material coiled by a mandrel basing on the conditions at the time when the tail end of the material runs out from a final rolling stand, and changing a preset value basing on the calculated value at every time till the coiling is finished. CONSTITUTION:An output signal of a pulse oscillator 2 is inputted to a preset counter 7 and a pulse counter 15, and a controlling pitch and the number of pulses which measure the total length are inputted to a tracking controlling device 14 simultaneously with inputting the thickness of a rolling material 3 from a thickness gauge 12 to the device 14, for a period from the time the front end of the material 3 is bitten by a mandrel 6 to the time the tail end of it runs out from a final rolling stand 1. Further, an output of a pulse generator 10, generating a pulse in accordance with the rotation of mandrel 6, is inputted to a preset counter 11, and the controlling pitch is inputted to the device 14. The device 14 calculates a coiled coil diam. basing on the these values to change a preset value at every presetting.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a hot rolling system equipped with a rough rolling mill, a finishing rolling mill, a cooling device, a mandrel, etc. This invention relates to a method for tracking rolled material necessary for controlling positional stopping, etc.

[Technical background of the invention]

Generally, in hot rolling systems, this coiling temperature control,
Automatic thickness control (AGC) is used to control the classification eye, mandrel tail end fixed position stop, etc.

DDC (Direct Digital Cont.
The control based on length pitch is performed instead of the control based on time pitch, which is carried out in (rol). This requires tracking of the rolled material and longitudinal control points.

Conventionally, when the rolled material 3 is caught in the final rolling stand 1 shown in FIG. 1, the length pitch which is this control pitch is as follows:
The output signal of the /4' Lux transmitter 2 attached to the work roll of the final stand 1 is obtained via the preset counter 7, which is preset as a control pitch, and after the tail end of the rolled material passes through the final stand 1, the output signal is set as the control pitch. A attached to roll 4? Similarly, the signal was obtained via the preset counter 8 by switching the pulse transmitter 5. The control pitch obtained in this way is input to the tracking control device 14, which controls a rolling control device (not shown).

[Problems with background technology]

However, since tension is applied between the pinch rolls 4 and the mandrel 6 in order to improve the shape of the 30 rolls of the compressed material, slippage occurs between the pinch rolls 4 and the rolled material 3. On the other hand, the influence of back tension caused by the hot run table 9 also makes the surface between the pinch rolls 4 and the rolled material 3 non-uniform. Therefore, due to this phenomenon, the tracking accuracy of the rolled material 3 by the pinch rolls 4 is very poor and non-uniform, and as a result, accuracy naturally deteriorates in various rolling controls based on this tracking. was.

For this reason, it is desired to improve accuracy, and in particular, tracking after the rolled material passes the final stand requires coiling temperature control using a hot run relay, classification using a coiling thermometer and width gauge, and tail end measurement using a mandrel. It has been desired to improve the accuracy for position stopping, etc.

[Purpose of the invention]

The present invention aims to provide a tracking method with improved accuracy.

[Summary of the invention]

In order to achieve the above object, the present invention calculates the diameter of the coil wound around the mandrel based on the length and thickness of the rolled material when the tail end of the rolled material passes through the final rolling stand, In this method, a preset counter provided on the mandrel side is reset every time based on this calculated value until the rolling material is completely wound on the mandrel.

[Embodiments of the invention]

Examples of the present invention will be described below.
An apparatus for carrying out the method of the present invention will be explained with reference to the figures. That is, a pulse generator 10 is attached to the mandrel 6 to generate a pulse according to the rotation.

The output of this pulse oscillator 10 is input to a preset counter 11, and a control pitch is output from the preset counter 11.

Also installed on the final rolling stand 1? Lux transmitter 2
The outputs are input not only to the preset counter 2 but also to the Noculus counter 15, where the preset counter 7 counts the control pitch and the pulse counter 15 counts the Noculus number to measure the total length of the rolled material. Said A? The pulse transmitters 2 and 10 are the final rolling stand 1
until the head end of the rolled material bites and the end of the rolled material passes through the end)
J? Only the pulse transmitter 2 is driven, and when the tail end of the rolled material passes through the final rolling stand 1 from the state of 1) /J? Only the pulse oscillator 10 is driven.

Further, the instantaneous value of the thickness of the rolled material 3 is measured by the thickness meter 12 from when the head end of the rolled material is bitten by the mandrel 6 until the tail end of the rolled material passes through the final rolling stand 1. The present invention differs from the conventional example described above only in the points described above.

The outputs of the preset counters 7 and 11, the motherboard counter 5, and the thickness gauge 12 are input to a tracking control device (hereinafter referred to as the control device) 14, where they are calculated as follows.

In addition, when the rolled material 3 is caught in the final rolling stand 1, the control pitch is determined by the output signal of the pulse generator 2, as in the conventional example shown in FIG. Obtained in 7.

The roll speed of the final rolling stand 1 from when the head end of the rolled material is bitten by the mandrel 6 until the tail end of the rolled material passes through the final rolling stand is determined by the roll speed transmitter 2 attached to the final rolling stand 1 and the speed counter 15. The data is input to the controller 14, and the following information is input within the controller 14:
■Length L of the rolled material 3 wound up on the simandrel 6 according to the formula
is calculated.

Here, when comparing the lateral area of the rolled material 3 before being wound on the mandrel 6 and the lateral area after being wound on the mandrel 6, the width and thickness of both rolled materials are the same, so formula (■) is established. do.

6- Here, h: average value of the measured thickness, Dc: diameter of the wound coil, DM=diameter of the mandrel.

However, L is the length of the rolled material 3, which is 0 formula % formula % Here, 1: z 4' The number of russes counted by the russ counter 15 ・f russ number n': 1 revolution of the work roll of the final rolling stand 1 Number of pulses D generated in: The diameter of the work roll of the final rolling stand 1.

Further, the preset value P at which the preset counter 11f is reset after the rolled material 3 is removed from the final rolling stand 1 can be obtained by formula (2).

Here, N: number of base waves generated in one rotation of the mandrel t: control pitch It is.

DC/ is the diameter of the winding coil at the moment when the winding becomes thicker from time to time, and this is derived from the formula (2).

Here, L' is the mandrel winding length.

Next, a method for tracking rolled material according to the present invention will be explained.

From the time when the head end of the rolled material is bitten by the mandrel 6 until the tail end of the rolled material passes through the final rolling stand 1, the output signal of the Noculus transmitter 2 is set to a control pitch with a considerable number of pulses. It is input to the preset counter 7. The operation in this state is the same as that of the conventional example described above, but in this state, the output of the Nofrus counter 15 is input to the control device 14, and the length L of the rolled material is calculated based on formulas (1) and (2). be done. Further, the thickness output (instantaneous value) of the rolled material 3 from the thickness gauge 12 is input to the control device 14, and the average value of the measured thicknesses is calculated. The average value b1 of this thickness
Length L1 of the above-mentioned rolled material Direction of winding coil of mandrel 6 measured in advance tlDi*1 Mandrel winding length, space factor (
The control pitch t obtained from the grisset counter 7 is input to the control device 14, and the diameter Dc' of the winding coil of the mandrel 6 is calculated based on the formula (2). The diameter of the wound coil thus obtained - DC - C - the control pitch and, for example, No. 4? The /4' las number N generated during one rotation of the mandrel, determined from the output of the las oscillator 10, is input to the control device 14, and a preset value P is preset to the preset counter 11 based on the formula □.
is calculated.

At this time, the mandrel winding length L' is as shown in equation 0.

L'=Ll-L,...
■Here, Ll: total length of rolled material, L2: hot run table length.

■When the preset value P obtained by the formula is preset in the grise cut counter 11, this value is cleared and an interrupt signal is output. It becomes the same as the control pitch t.

Then, when the control device 14 inputs an interrupt signal immediately after switching from the Noflus transmitter 2 to the No9lus transmitter 10 on the mandrel 6 side, the control device 14 inputs an interrupt signal to the preset counter 11 in order to obtain the next control pitch t. ■Preset the reset value obtained by the formula. At this time, the mandrel winding length L
The value of ' is as shown in the formula 0.

L'=LILx 10t...
(2) After that, the control pitch t is added to the value of the length L of the rolled material used to calculate the previous preset value, and the preset is performed using the formula (2). When the control pitch t is obtained by the pulse transmitter 2 of the final rolling stand 1, the key reset value may remain unchanged without changing the roll diameter.

However, when obtaining the control pitch t with the mandrel switched to the 6 side, the coil diameter increases as the coil is wound. There will be a need to continue.

Thus, embodiments of the method of the invention improve accuracy. This is for the following reasons. In other words, when the control pitch is obtained at the final rolling stand 1, the preset value can remain unchanged as long as the roll diameter is not changed, but when switching to the mandrel 6 and obtaining the control pitch, the coil diameter is changed. This is because the preset value P is changed for each preset in this way because the winding becomes thicker and larger as the winding increases.

Specifically, the improvement in tracking accuracy according to the embodiment of the present invention is as shown in FIG. 4. In tracking A using the conventional method of Vinci roll 4, the length after the final rolling stand is taken as Ls and 1. If a length of &+t)*e occurs at points /, b/, and C/, a length error of d=L4-L3=a+b+4 occurs. Note that Ls is the length grasp point υ in the control according to the conventional method, and L4 is the length ζ actual length in the control according to the present invention.

Moreover, even if the control pitches up to 1 and 2 are synchronized with the tracking method B according to the present invention, after the first slip occurs, the synchronization for each point of the rolled material deviates from 3' to 13' in total. I end up. Note that in FIG. 4, TAL indicates the tail end of the rolled material.

As described above, the above-described embodiments of the present invention relate to a tracking method for obtaining a constant length control pitch from the length, thickness, and space factor of the rolled material. can also be obtained by other methods.

For example, as shown in FIG. 3, the output of the speed counter 16 which inputs the output of the pulse generator 2 and outputs the speed of the rolled material is input to the control device 14 and integrated as shown in equation 0. The length L of the material 3 may also be determined.

Here, tl is the time when the head end of the rolled material 3 is bitten by the final rolling stand 1, t2 is the time when the tail end of the rolled material 3 leaves the final rolling stand, and υ is the speed of the rolled material.

In addition, in FIG. 2, if the 15 count period of the crus counter is defined as the period from when the head end of the rolled material is bitten by the mandrel 6 until the tail end of the rolled material exits the final rolling stand 1, then The value of length L can be used as is as the winding length.

Furthermore, regarding the thickness, even if the actual measured value is not used, it is possible to use the target thickness as long as the thickness accuracy is achieved.

〔Effect of the invention〕

As described above, according to the present invention, the tracking method of rolled material realizes improved precision compared to conventional methods, and this directly leads to improved precision in various rolling controls and improved quality of rolled products. can be provided.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining a conventional tracking method for rolled materials, FIG. 2 is a diagram for explaining an embodiment of the tracking method for rolled materials according to the present invention, and FIG. 3 is a diagram for explaining an embodiment of the tracking method for rolled materials according to the present invention. FIG. 4 is a diagram for explaining another embodiment of the tracking method for rolled material. FIG. 4 is a diagram for explaining the effect of the embodiment of FIG. 2. DESCRIPTION OF SYMBOLS 1... Final stand, 2... Final stand attachment master pulse transmitter, 3... Rolled material, 4... Pinch roll,
5... Pinch roll mounted pulse generator, 6... Mandrel, 9... Hot run table, 10... Mandrel mounted pulse generator, J J... Noise reset counter for mandrel pulse transmitter, 12.・Thickness gauge,
13... Speed counter for mandrel/4' Luz transmitter, 14... Tracking control device, 15...
Final rolling stand/4' base pulse counter for pulse transmitter, 16... Speed counter, A... Conventional tracking method, B... Tracking method of the present invention, IL
I, b', c'...Slippage? in), a. b, c...Slip amount, d...a + b + c %
Ls...Length grasping length for control by conventional method, L4
・・・14- Controlled length ≠ Actual length. -15- Figure 1 Figure 2

Claims (1)

[Claims] In the process of winding the rolled material from the final rolling stand onto the mandrel, the length and thickness of the rolled material when the tail end of the rolled material exits the final rolling stand are determined. The diameter of the winding coil is calculated, and the calculated value of the diameter of the winding coil is applied to a coil provided on the mandrel side until the tail end of the rolled material passes through the final stand and winding of the rolled material onto the mandrel is completed. A tracking method for rolled material in which the preset counter is preset every time.