JP2001009513A - Speed setting device for plurality of strands rolling machine group - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a miss-roll by computing a speed ratio between the adjacent plurality of strand rolling machines based on the plurality of strands rolling machine speed for storing it in a speed ratio storage means, and setting the speed of the plurality of strands rolling machine group individually based on the speed ratio and a detected value of a material detection means which detects existence of the plurality of strands. SOLUTION: When it is judged to be an optimum rolling condition and, a push button switch 8 is switched on, a rolling roll speed ratio of an adjacent stand is stored in a speed ratio storage 9. Material detectors 5, 6 installed at an exit side of each stand detect the rolling material and add it to a speed setting operation unit 10. According to an output signal of the material detectors 5, 6, the speed setting operation unit 10 detects a rolling condition of the stand and, outputs a speed setting value corresponding to the rolling condition. At every time when the rolling condition is changed as rolling is progressed, a setting against a speed controller 4 changes in succession and an optimum speed setting value for each rolling machine is provided corresponding to the number of the rolling strands.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed setting device for a group of multiple strand rolling mills in which a plurality of strand rolling mills capable of simultaneously rolling a plurality of wire rods are arranged in tandem.

[0002]

2. Description of the Related Art The conventional speed setting in a group of multiple-strand rolling mills is based on the material and size of a rolled material regardless of whether it is single-strand rolling or multiple-strand rolling. According to the rolling schedule, the speed setting value appropriate for each rolling mill is semi-fixedly set by an operator or a computer. In the case of single-strand rolling, the rolling reaction force applied to the rolling roll at the time of rolling is constant as long as the rolling schedule is the same, and there is no particular problem with the above-mentioned conventional speed setting method.

[0003] However, in the case of multiple strand rolling, the rolling reaction force applied to the rolling rolls changes greatly depending on the number of rolling strands, and the gap between the upper and lower rolls also changes.
By the way, at the time of N-strand rolling, where N is a positive integer, if the leading and trailing end positions of the rolled material are different for each strand,
When looking at one rolling mill, the number of materials being rolled changes from one to N, and the roll gap also fluctuates.

Accordingly, although the set value of the optimum rolling speed must be changed depending on the number of rolling strands,
Conventionally, even in such a situation, without any measures,
The speed was simply fixed. Therefore, the change in the roll gap due to the change in the number of strands during rolling is
By changing the mass flow balance, a tension or compression force is generated in the rolled material, and material breakage and loops are generated.
This was causing misroll.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides an optimum speed set value to each rolling mill in accordance with the number of rolling strands. It is an object of the present invention to provide a speed setting apparatus for a group of multiple strand rolling mills, which can prevent a change in finish dimensions while preventing the occurrence of a change in finish dimensions.

[0006]

The invention according to claim 1 is
In a speed setting device of a group of multiple strand rolling mills in which multiple strand rolling mills capable of simultaneously rolling a plurality of wire rods are arranged in tandem, speed detecting means for detecting the speed of each of the multiple strand rolling mills, and speed detection. Speed ratio calculating means for calculating a speed ratio between a plurality of adjacent strand rolling mills based on the output of the means, switch means which can be operated externally, and a speed calculated by the speed ratio calculating means in response to the operation of the switch means Speed ratio storage means for storing a ratio, a material detection means for detecting the presence or absence of a rolled material of a plurality of strand rolling mills for each strand, and a detection value of the material detection means and a speed ratio stored in the speed ratio storage means. And speed setting calculating means for individually setting the speeds of the plurality of strand rolling mill groups.

According to a second aspect of the present invention, there is provided a speed setting device for a plurality of strand rolling mills according to the first aspect, wherein the speed preliminary setting means for preliminary setting the speed of the plurality of strand rolling mills, and the speed prognostic setting means. A mode changeover switch for switching from the preset speed set value to the speed set value set by the speed setting calculating means.

According to a third aspect of the present invention, in the speed setting device for a plurality of strand rolling mill groups according to the first or second aspect, the speed setting calculating means sets the speed of one of the plurality of strand rolling mills to be a reference. The speed of the plurality of adjacent strand rolling mills is sequentially calculated by multiplying the speed ratio of the speed ratio storage means corresponding to the rolling state detected by the detection means.

According to a fourth aspect of the present invention, in the speed setting device for a plurality of strand rolling mill groups according to any one of the first to third aspects, the material detecting means detects a rolled material for each strand instead of detecting each rolled material. The number of rolled materials is detected.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on preferred embodiments shown in the drawings. FIG. 1 is a block diagram showing a configuration of an embodiment of a speed setting device for a plurality of strand rolling mill groups according to the present invention, together with a rolling system. In FIG. 1, a plurality of strand rolling mills 1 capable of simultaneously rolling a plurality of wires are arranged in tandem. In this case, the number of the plurality of strand rolling mills 1 is two or more, and generally five to seven. Multiple strand rolling mill 1
Are respectively driven by a drive motor 2, and these constitute first to n-th rolling stands (hereinafter, rolling stands are simply referred to as stands).

A speed detector 3 for detecting the speed is connected to the drive motor 2 of each stand.
A speed control device 4 is provided to control the speed of the vehicle. On the exit side of each stand, there are provided material detectors 5 and 6, which are, for example, hot lump detectors for detecting the presence or absence of a rolled material. Here, each of the plurality of strand rolling mills 1 includes first and second strands, and the material detector 5 detects the presence or absence of a rolled material on the first strand, and detects the presence or absence of a rolled material on the second strand. The detector 6 detects it.

Further, a speed ratio calculating device 7 for inputting a detection value of the speed detector 3 of the adjacent stand and calculating a speed ratio of the upstream stand to a speed of the downstream stand, and an operator turning on at an appropriate timing. A push button switch 8 to be operated and a speed ratio storage device 9 for storing the speed ratio calculated by the speed ratio calculation device 7 in response to the ON operation of the push button switch 8 are provided. Material detectors 5, 6
The speed set value for the drive motor 2 of each stand is calculated based on each of the detected values and the stored value of the speed ratio storage device 9,
A speed setting operation device 10 that outputs the signal at an appropriate timing and adds the speed setting device 4 to the speed control device 4 is provided.

A speed preset value (not shown) fixedly set by a conventional operator or a computer is provided on a path for adding the speed set value output from the speed setting calculation device 10 to the speed control device 4 of each stand. Mode switch 1 for switching between the set value of the means and the set value of the speed setting calculation device 10
1 is provided.

The operation of this embodiment configured as described above will be described below. To explain the concept of mass flow balance, which is the premise of setting the optimum speed, in a certain rolling mill, the material speed on the entry side is V1, the material cross section is A1, the material speed on the exit side is V2, and the material cross section is A2. Then, the following relationship is established between them.

V 1 / V 2 = A 2 / A 1 (1) Generally, the roll speed and the roll gap of the final stand of the rolling mill group are determined, and the roll speed and the roll gap of the upstream stand are sequentially determined by the equation (1). Set to. If rolling is performed at the roll speed and the roll gap for each rolling mill determined in this way, each stand can basically perform rolling with good mass flow balance. However,
In a group of rolling mills in which a plurality of strand rolling mills are arranged in tandem, the number of rolled materials changes when the leading and trailing ends of the rolled material pass, so that it is difficult to perform control with emphasis on mass flow balance between stands.

Therefore, in this embodiment, rolling is performed by a conventional operator or a speed presetting means fixedly set by a computer, and when the operator determines that the rolling state is optimal, an adjacent stand is set. And memorize the speed ratio of
According to the rolling state at each stand, the speed of the adjacent stand is set sequentially from the reference stand.

Now, the speed set value fixedly set by the operator or the computer is added to the speed control device 4 by the mode change switch 11, whereby the rolling by the plural-strand rolling mill 1 is performed. At this time, the speed of the drive motor 2 of each stand is determined by the speed detector 3 coupled thereto.
Is detected by The speed ratio calculating device 7 arranged between the stands continuously calculates the speed ratio of the drive motor 2 of the adjacent stand, that is, the speed ratio of the roll of the stand.

When the operator monitors the rolling state and determines that the rolling state is optimal, when the operator turns on the push button switch 8, the speed ratio of the rolling rolls of the adjacent stand is stored in the speed ratio memory. It is stored in the device 9. Material detectors 5 and 6 provided on the outlet side of each stand respectively detect the rolled material and apply it to the speed setting arithmetic unit 10. The speed setting arithmetic unit 10 detects the rolling state of the stand based on the output signals of the material detectors 5 and 6, and outputs a speed setting value corresponding to the rolling state. Hereinafter, this will be described for a specific rolling state shown in FIG.

FIGS. 2A to 2D show various rolling states in a plurality of strand rolling mill groups. here,
Each of the plurality of strand rolling mills in the first to seventh stands is the first
The configuration is such that rolling on the strand and rolling on the second strand are possible. (A) rolls the rolled material 21 on the first strands of the fifth to seventh stands, rolls the rolled material 22 on the first strands of the first and second stands,
The state where the rolled material 23 is being rolled by the second strand of the sixth stand is shown. (B) shows a state immediately before rolling the rolled material 31 on the first strand of the first and second stands and rolling the rolled material 32 on the first stand.
(C) shows a state where the rolled material 41 is rolled on the first strand of the first to fifth stands and the rolled material 42 is rolled on the second strand of the first and second stands.
(D) shows a state where the rolled material 51 is rolled on the first strand of the third to seventh stands and the rolled material 52 is rolled on the second strand of the first to seventh stands.

On the other hand, the speed ratio of the first stand to the speed of the second stand in a state where the rolled material is being simultaneously rolled on the first strands of the first and second stands is α1, and similarly, the first and second stands The ratio of the speed of the first stand to the speed of the second stand in a state where the rolled material is simultaneously rolled on the second strand of the two stands is β1, and the first and second speeds are as follows.
Let γ1 be the speed ratio of the first stand to the speed of the second stand in a state where the rolled material is being simultaneously rolled on the first and second strands of the stand.

In exactly the same way, the speed ratio between the other stands, that is, the n-th and n + 1-th (n = 1 to
6) The speed ratio of the n-th stand to the speed of the (n + 1) -th stand in the state where the rolled material is simultaneously rolled by the stand is αn, and similarly, the rolled material is simultaneously rolled on the second strand of the n-th and (n + 1) -th stands. The speed ratio of the n-th stand to the speed of the (n + 1) -th stand is βn,
First and second strands of the nth and (n + 1) th stands
The speed ratio of the n-th stand to the speed of the (n + 1) -th stand in a state where the rolled material is being simultaneously rolled on the strand is denoted by γn.

The rolling states shown in FIGS. 2A to 2D are determined on the basis of the detection values of the material detectors 5 and 6 installed on the exit side of each stand. be able to.

Now, the operator observes various rolling states on the first strand and the second strand by means of a preliminary speed setting by an operator or a computer, etc., and when it is determined that the rolling state is the optimum, the state between the stands is determined. The corresponding push button switches 8 are turned on, and the speed ratios α1 to αn, β1 to
βn, γ1 to γn are stored in the speed ratio storage device 9.

In the rolling state shown in FIG. 2A, the speed of the seventh stand is set to N as a reference stand.
Assuming that the speed is 7, the speed setting calculation device 10 calculates and sets the speeds N6 to N1 of the sixth to first stands in accordance with the following equation.

N 7 = N 7 (2) N 6 = N 7 · α 6 = N 7 · α 6 (3) N 5 = N 7 · α 6 · γ 5 = N 6 · γ 5 (4) N 4 = N 7 · α 6 · γ 5 · β 4 = N 5 · β4 ... (5) N3 = N7 · α6 · γ5 · β4 · β3 = N4 · β3 ... (6) N2 = N7 · α6 · γ5 · β4 · β3 · β2 = N3 · β2 ... (7) N1 = N7 · α6 .Gamma.5 .beta.4 .beta.3 .beta.2 .gamma.1 = N2 .gamma.1 (8) When these settings are completed, the mode changeover switch 11 is switched to the automatic setting mode, and the speeds N7 to N1 set by the speed setting arithmetic unit 10 are changed. It is added to the speed control device 4 of the stand.

Similarly, in the rolling state shown in FIG. 2B, the speed shown in the following equation is automatically set. N7 = N7 ... (9) N6 = N7 · α6 ... (10) N5 = N6 · α5 ... (11) N4 = N5 · α4 ... (12) N3 = N4 · α3 ... (13) N2 = N3 · α2 ... ( 14) N1 = N2 · α1 (15) In this case, since the second strand is not rolled, the speed of each stand is set as in the case of rolling only the first strand.

Next, in the case of FIG. 2C, the material on the second strand side is bitten into the second stand,
Since the mass flow balance between the first and second stands is lost, the speed N1 of the first stand is changed to N2.gamma.2 at the timing when the material detector 6 on the exit side of the second stand detects the material.
Switch to Therefore, the speed of each stand is set to the value of the following equation.

N7 = N7 (16) N6 = N7 · α6 (17) N5 = N6 · α5 (18) N4 = N5 · α4 (19) N3 = N4 · α3 (20) N2 = N3 · α2 (21) N1 = N2 · γ1 (22) In the case of FIG. 2D, the speed of each stand is set to the value of the following equation.

N 7 = N 7 (23) N 6 = N 7 · γ 6 (24) N 5 = N 6 · γ 5 (25) N 4 = N 5 · γ 4 (26) N 3 = N 4 · γ 3 (27) N 2 = N 3 · β2 (28) N1 = N2 · β1 (29) As described above, each time the rolling progresses and the rolling state changes, the setting state for the speed control device 4 is sequentially changed to correspond to the number of rolling strands. As a result, an optimum speed set value is given to each rolling mill, thereby preventing a misroll due to the generation of tension or compression force and suppressing a change in finish dimensions.

In the above embodiment, the case of two-strand rolling has been described. However, the present invention is not limited to this, and can be applied to rolling of three or more strands.

In this embodiment, the hot lump detectors are used as the material detectors 5 and 6 for detecting the rolled material of each strand during rolling. However, the rolling state can also be detected by tracking the rolled material by a computer. be able to.

Further, in the above embodiment, it is assumed that materials having different dimensions are rolled by a plurality of strands.
Although the material detectors 5 and 6 are provided on the first and second strands, when a material having the same size is rolled on a plurality of strands, the number of rolled materials is detected, and the speed ratio corresponding to the number is determined. By calculating and storing, the configuration can be simplified.

[0033]

As is apparent from the above description, according to the present invention, in the group of plural strand rolling mills, the optimum stand-to-stand speed ratio based on the combination of the strands being rolled is determined from the actual rolling. And thereafter, the speed setting of each stand is automatically performed according to the stored speed ratio, so that misrolling due to generation of tension or compression force is prevented, and a change in finish dimensions is suppressed. In addition to the effect of being able to perform the operation, the effect that the burden on the operator can be reduced can also be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a speed setting device for a plurality of strand rolling mill groups according to the present invention, together with a rolling system.

FIG. 2 is a schematic view showing various rolling states in a two-strand rolling mill to explain the operation of the embodiment shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Multiple strand rolling mill 2 Drive motor 3 Speed detector 4 Speed control device 5 Material detector 6 Material detector 7 Speed ratio calculator 8 Push button switch 9 Speed ratio storage device 10 Speed setting calculator

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tadashi Tanabe 1-1-1, Shibaura, Minato-ku, Tokyo F-term in Toshiba head office (reference) 4E002 AC12 AC14 BC02 CB08 4E024 AA10 CC03 EE01

Claims (4)

[Claims] 1. A speed setting device for a group of multiple strand rolling mills in which a plurality of strand rolling mills capable of simultaneously rolling a plurality of wire rods are arranged in tandem, wherein a speed for detecting a speed of each of the plurality of strand rolling mills is provided. Detecting means; speed ratio calculating means for calculating a speed ratio between the plurality of adjacent strand rolling mills based on an output of the speed detecting means; an externally operable switch means; in response to an operation of the switch means Speed ratio storage means for storing the speed ratio calculated by the speed ratio calculation means, presence or absence of a rolled material of the plurality of strand rolling mills, a material detection means for detecting for each strand, a detection value of the material detection means and Speed setting calculation means for individually setting the speeds of the plurality of strand rolling mill groups based on the speed ratio stored in the speed ratio storage means. A speed setting device for a group of multiple strand rolling mills, characterized in that: 2. Speed preliminary setting means for preliminarily setting the speed of the plurality of strand rolling mills, and switching from a speed set value preliminarily set by the speed prognostic setting means to a speed set value set by the speed setting calculating means. The speed setting device according to claim 1, further comprising: a mode changeover switch. 3. The speed setting calculating means sequentially multiplies a speed of one of the plurality of strand rolling mills as a reference by a speed ratio of the speed ratio storing means corresponding to a rolling state detected by the material detecting means. The speed setting device for a group of multiple strand rolling mills according to claim 1 or 2, wherein the speed of the adjacent multiple strand rolling mills is calculated. 4. The group of multiple strand rolling mills according to claim 1, wherein said material detecting means detects the number of rolled materials instead of detecting each rolled material for each strand. Speed setting device.