JP3991136B2 - Rolling material conveyance speed adjustment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolled material conveying speed adjusting device that adjusts the conveying speed of a material to be rolled so that an upstream rolling press and a downstream rolling mill can simultaneously process the material to be rolled.
[0002]
[Prior art]
Conventionally, a coarse mill has been used for rolling a slab. The slab to be rolled is a short slab of 5 to 12 m, and in order to obtain a predetermined thickness, a plurality of coarse mills are provided, or reverse rolling is performed in which rolling is performed by moving the slab forward and backward. In addition, a running press that conveys the slab while rolling down, a start-stop type rolling press that stops the conveyance of the material to be rolled at the time of rolling down, and carries it at other times than the rolling down is also used.
[0003]
[Problems to be solved by the invention]
Long slabs using continuous casting equipment have come to be used, and it is desired to continuously convey the slabs to subsequent rolling apparatuses. In the case of rough rolling with a rough mill, there is a limit of bite angle (about 17 °), and the thickness reduction by one rolling cannot be increased. Since the slab is continuous, reverse rolling cannot be performed, and in order to obtain a desired thickness, it is necessary to provide a plurality of coarse mills in series, or in the case of one, it is necessary to greatly increase the diameter of the work roll. Manufacturing such a large-diameter coarse mill is difficult in terms of cost in terms of design, and when the diameter is large, the roll life is shortened due to low-speed rolling, which makes it difficult to cool the roll. Since the rolling press has a large reduction amount and can be rolled while conveying the material to be rolled, the material to be rolled can be continuously conveyed to the downstream rolling mill. It was difficult to adjust the speed of the material to be rolled so that it could be rolled and rolled at the same time. Further, the rolling of the material to be rolled was stopped during the rolling by the rolling press, and the rolling stop and the start-stop type rolling press that transports when the rolling was not performed could not be continuously rolled in the tandem.
[0004]
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a rolled material conveyance speed adjusting device capable of simultaneously performing a rolling operation of a rolling press and a rolling operation of a downstream rolling mill. .
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, it is arranged between the reduction press and the rolling mill and is provided at an interval necessary for bending the material to be rolled, and the conveyance speed of the material to be rolled is adjusted. A speed adjusting roll, a passing length measuring instrument for measuring the passing length of the material to be rolled which is provided in or near the speed adjusting roll, and controls the operation of the rolling press and measured values of the passing length measuring instrument And a control device for adjusting both speed adjusting rolls.
[0006]
A deflection that absorbs the difference in speed of the material to be rolled passing between the rolling press and the rolling mill is provided, and the difference between the passage length measuring instruments provided on the press side and the rolling mill side at both ends of the deflection is obtained. The control device controls the operations of the two speed adjusting rolls and the rolling press so as to make the predetermined range while absorbing the passage length difference with the deflection. As a result, the reduction of the reduction press and the rolling of the rolling mill can be performed simultaneously. The rolling press can be operated at the same time, whether it is a running press or a start / stop press.
[0007]
In the invention of claim 2, the control device obtains a difference in the passing length of the measured values of the two passing measuring instruments for a period that is an integral multiple of the rolling cycle of the rolling press, the number of rolling cycles of the rolling press, and the conveyance speed of each speed adjusting roll. Any one of these or a combination thereof is adjusted to control the passage length difference to approach zero.
[0008]
While the difference in the passage length in the integral multiple of the rolling cycle of the rolling press is absorbed by the deflection, the control device either increases or decreases the number of rolling cycles per unit time of the rolling press, increases or decreases the conveyance speed of each speed adjusting roll, or By performing these combinations, the passage length difference is adjusted to approach zero.
[0009]
According to a third aspect of the present invention, a deflection measuring instrument for measuring the deflection of the material to be rolled between the speed adjusting rolls is provided, and the control device is controlled so that the deflection falls within a predetermined range based on the measured value.
[0010]
With the above configuration, the deflection is suppressed within a predetermined range, so that excessive force can be prevented from being generated in the rolling press and the rolling mill due to excessive deflection, and the occurrence of elongation due to the weight of the rolled material in a high temperature state can be prevented due to excessive deflection. .
[0011]
According to a fourth aspect of the present invention, there is provided a material transport device that can be moved up and down between the speed adjusting rolls, and the material to be rolled at a level substantially equal to the transport level of the speed adjusting roll when passing through the front end or the rear end of the material to be rolled. Transport.
[0012]
Provided with a rolled material transport device having a roll that can be moved up and down in the section where the rolled material is bent and transports the rolled material, when bending occurs, the rolled material is lowered downward, and the tip or the back of the rolled material When the end passes, the level is almost the same as the conveyance level of the speed adjusting roll. Thereby, the front-end | tip or back end of a to-be-rolled material can also pass through the bending | flexion generating area smoothly.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram illustrating a configuration of a rolled material conveyance speed adjustment device according to a first embodiment. A running press 2 is provided from the upstream side along the flow of the material 1 to be rolled, and a rolling mill 3 is provided on the downstream side. The running press 2 includes a die 2a for reducing the material to be rolled 1, a reduction cylinder 2b for reducing the die 2a, and a transfer cylinder 2c that reciprocates in the direction of the material to be rolled between the die 2a and the reduction cylinder 2b. I have. The rolling mill 3 is a rough rolling mill and a finish rolling mill or a finishing rolling mill. Between the running press 2 and the rolling mill 3, a press-side speed adjusting roll 4 is provided on the running press 2 side, and a rolling mill-side speed adjusting roll 5 is provided on the rolling mill 3 side. The speed adjusting rolls 4 and 5 are pinch rolls, measuring rolls, etc., and adjust the speed of the material 1 to be conveyed and also measure the passage length. Between the running press 2 and the press-side speed adjusting roll 4 and between the rolling mill 3 and the rolling mill-side speed adjusting roll 5, a transport table 6 for transporting the material 1 to be rolled is provided.
[0014]
A guide roll 7 is provided between the press side speed adjustment roll 4 and the rolling mill side speed adjustment roll 5 at a distance m from the outer periphery, and the gap between the two guide rolls 7 constitutes a deflection section m of the material 1 to be rolled. In the bending section m, the ground is dug down to form a recess, and an elevating table 8 having a roll for conveying the material 1 to be rolled is provided, and is raised and lowered by an elevating cylinder 9 provided in the lower part. In the deflection section m, a low position detector 10a for detecting a large deflection position and a high position detector 10b for detecting a small deflection position are provided. The control device 11 is based on the passing length data from the press side speed adjusting roll 4 and the rolling mill side speed adjusting roll 5 and the deflection data of the low position detector 10a and the high position detector 10b. The adjusting roll 4, the rolling mill side speed adjusting roll 5, and the lifting cylinder 9 are controlled.
[0015]
Next, the operation will be described. First, the elevating table 8 is moved to the upper limit position by the elevating cylinder 9, that is, the roll position of the elevating table 8 is set to the position of the guide roll 7, and then the rolling press 2 is operated to lower the material 1 to be rolled. To send. In the rolling mill 3, rolling is started continuously. When the material 1 to be rolled enters the rolling mill side speed adjusting roll 5, the lifting table 8 is lowered to the deflection lower limit position. At the same time, the passing length data from the press-side speed adjusting roll 4 and the rolling mill-side speed adjusting roll 5, and the measured values of the deflection data of the low position detector 10a and the high position detector 10b are inputted, and one cycle of the running press is performed. Alternatively, a difference between two passage lengths in a plurality of cycle periods is obtained, and the material to be rolled 1 is conveyed by the press side speed adjustment roll 4 and the rolling mill side speed adjustment roll 5 so that the passage length difference is zero. Controls such as speed adjustment and increase / decrease of the number of cycles within a predetermined period are performed. Any one of these three adjustments, a combination of any two, or three simultaneous adjustments are performed. Also, the data of the low position detector 10a and the high position detector 10b are constantly monitored to check whether the deflection is within a preset range. If the deflection is out of the range, the speed adjustment rolls 4 and 5 adjust the deflection to be within the range. Is made. When the rear end of the material 1 to be rolled approaches the press speed adjusting roll 4, the lifting cylinder 9 is operated so that the roll position of the lifting table 8 becomes the position of the guide roll 7 again.
[0016]
2A shows the speed of the material to be rolled on the entry side of the press-side speed adjusting roll, and FIG. 2B shows the speed of the exit side of the rolling mill-side speed adjusting roll 5. The conveying speed of the material 1 to be rolled running on the running press 2 is adjusted by a press-side speed adjusting roll 4, and the speed of the material 1 to be fed to the rolling mill 3 is adjusted by a rolling mill-side speed adjusting roll 5. In (A), the reduction period is determined by the conveyance cylinder 2c so as to obtain an optimum conveyance speed for the reduction, and the press-side speed adjustment roll 4 is adjusted to be this speed. When the reduction is completed, the conveyance speed is increased in order to recover the low speed at the time of reduction, and then the normal conveyance speed is reduced, and this speed is maintained. Then, the reduction is reduced to the reduction speed of the next cycle. The operation of the mold 2a and the reduction cylinder 2b by the transfer cylinder 2c moves in the flow direction of the material 1 to be rolled for a while during the reduction from before the reduction and after the reduction, and then performs the return operation. The press-side speed adjustment roll 4 adjusts the conveyance speed during a period other than the reduction (a period in which the mold 2a is separated from the material to be rolled 1). As shown in (B), the rolling mill side speed adjusting roll 5 is adjusted so that the material 1 to be rolled is fed to the rolling mill 3 at a conveyance speed as uniform as possible.
[0017]
Next, a second embodiment will be described. FIG. 3 is a diagram showing a configuration of the material to be rolled conveyance speed adjusting device of the second embodiment. The same reference numerals as those in FIG. The present embodiment is different in that it is a start / stop type reduction press 20 that stops the conveyance of the material 1 to be rolled while the running press 2 in FIG. 1 is being reduced, and the others are the same. Since the point of conveyance speed adjustment differs greatly, it demonstrates using FIG. FIG. 4A shows the conveyance speed of the material 1 to be rolled that passes through the reduction press 20. One cycle represents that of the rolling press 20. The conveyance speed is 0 during the reduction period. When the reduction is completed, the speed is rapidly increased to recover the delay, and then is rapidly decreased to the normal speed. As the next cycle of reduction approaches, the speed approaches zero. In the rolling mill side speed adjusting roll 5, as shown in (B), the period of rapid speed change is absorbed by deflection, and the material 1 is fed into the rolling mill 3 at a uniform speed as much as possible, but the speed change is large. However, there is an influence of speed change. As described above, the rolled material conveyance speed adjusting device of the present invention can be applied not only to the running press 2 but also to the start / stop type reduction press 20.
[0018]
【The invention's effect】
As is clear from the above description, the present invention simultaneously performs press reduction and rolling of the rolling mill by adjusting the conveyance speed of the material to be rolled that flows between the upstream press and the downstream rolling mill. Can do.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a first exemplary embodiment of the present invention.
FIG. 2 shows the speed of the material to be rolled according to the first embodiment, (A) shows the conveying speed of the material to be rolled on the running press exit side, and (B) shows the conveying speed on the entry side of the rolling mill.
FIG. 3 is a diagram showing a configuration of a second exemplary embodiment of the present invention.
4A and 4B show the speed of the material to be rolled according to the second embodiment, FIG. 4A shows the speed of conveyance of the material to be rolled on the running press exit side, and FIG. 4B shows the speed of conveyance on the entry side of the rolling mill.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rolled material 2 Running press 2a Die 2b Reduction cylinder 2c Conveying cylinder 3 Rolling mill 4 Press side speed adjustment roll 5 Rolling mill side speed adjustment roll 6 Conveying table 7 Guide roll 8 Lifting table 9 Lifting cylinder 10a Low position detector 10b High position detector 11 Control device 20 Reduction press 20a Mold 20b Reduction cylinder

Claims (4)

A speed adjusting roll that is disposed between the reduction press and the rolling mill and that is provided at an interval necessary to bend the material to be rolled and adjusts the conveyance speed of the material to be rolled, and provided at or near the speed adjusting roll. And a control device for controlling the operation of the rolling press and adjusting both speed adjusting rolls according to the measurement value of the passage length measuring device. A rolled material conveying speed adjusting device characterized by the above. The control device obtains a passing length difference between the measured values of the two-pass measuring device for a period that is an integral multiple of the rolling cycle of the rolling press, and the number of rolling cycles of the rolling press, the conveyance speed of each speed adjusting roll, or a combination thereof The apparatus for adjusting a material to be rolled speed according to claim 1, wherein the difference in passing length is controlled to be close to zero. The deflection control device according to claim 1, wherein a deflection measuring device for measuring a deflection of the material to be rolled between the speed adjusting rolls is provided, and the control device is controlled so that the deflection falls within a predetermined range based on the measured value. Rolling material conveyance speed adjustment device. A rollable material conveying device capable of moving up and down is provided between the speed adjustment rolls, and conveys the rolled material at a level substantially the same as the conveyance level of the speed adjustment roll when passing through the leading edge or the trailing edge of the rolled material. The rolled material conveyance speed adjusting device according to claim 1.

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