JP3624619B2 - Rolling method and rolling control device for reversible cold rolling mill - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reversing cold rolling mill, a rolling method from acceleration to steady rolling, further deceleration and slipping, and a control device therefor.
[0002]
[Prior art]
In the conventional reversible rolling mill 1, as shown in FIG. 3, the tip of the strip 15 is wound around the take-up reel 11 in advance and a tension is applied to the strip 15, and then the roll gap of the rolling mill 1 is set to a predetermined value. Rolling was started and rolling was started.
[0003]
[Problems to be solved by the invention]
Therefore, as shown in FIG. 3, considerably longer portion of the tip of the strip 15 (L ₁ portion in the figure) becomes scrap, which decreases the yield.
Similarly, for rolling by reversing without pulling the tail from the inlet side reel 10 at the end of rolling, the length of the portion of the L ₂ of the tail becomes off-gage, also scrap and Na'ita.
[0004]
The present invention was devised in order to solve the above-mentioned conventional problems, and an object thereof is to provide a reversible cold rolling mill that performs rolling without reducing yield as in the prior art, and a control device therefor. To do.
[0005]
[Means for Solving the Problems]
According to the present invention, a plate thickness meter and a plate speed meter are provided on the entry / exit side of the rolling mill, the strip is rewound from the take-up take-up reel and passed through the rolling mill, and the strip tip is on the delivery side of the rolling mill. , The rolling gap of the rolling mill is set to a predetermined value, and rolling is started. The rolling process is continued with the end of the strip wound around the take-up reel on the delivery side of the rolling mill, and the strip tail end is at the rolling mill. When the reel enters the reel, the tension is applied to the end of the strip on the entry side of the rolling mill to prevent the meandering of the strip, and at the end of rolling, the strip is pulled out while rolling the tail end of the strip. Based on the rolling method of winding on the take-up reel on the side, multiple passes of rolling are repeated in the same manner to produce a strip with a predetermined thickness. At this time, the thickness gauge on the entry side and the plate speed on the entry / exit side Based on the total signal Calculating the thickness of the side, to compare the obtained sheet thickness signal with a target value, and controls every moment during rolling the roll gap based on the deviation, the rolling method of the reversible cold rolling mill is provided .
[0006]
Further, according to the present invention, the reversible cold rolling mill is provided with a plate thickness meter and a plate speed meter at least on the entry / exit side of the rolling mill, and a hydraulic reduction in which a roll gap is set by a servo valve and a hydraulic cylinder. A hydraulic mill equipped with an apparatus for detecting the timing at which the end of the strip reaches the outlet plate speed meter based on the signal from the plate speed meter, and receiving the signal from the calculation device, the roll gap A hydraulic reduction device set at a predetermined interval and a tension is applied across the tail end of the strip on the entrance side of the rolling mill to prevent the strip from meandering when the strip tail end passes through the entrance reel of the rolling mill. A mechanism to calculate the thickness of the outlet side based on the signals of the thickness gauge on the inlet side and the speedometer on the inlet / outlet side, compare the obtained thickness signal with the target value, and reduce the deviation hydraulically Sent to the machine and the roll gap is Rolling control apparatus for a reversible rolling mill and controlling the is provided.
[0007]
According to the above method and apparatus, when the leading end of the strip reaches the plate speed meter on the delivery side of the rolling mill, the roll gap of the rolling mill is set to a predetermined value to start rolling, and the leading end of the strip is directly moved to the exit side of the rolling mill. Rolling around the take-up reel and continuing rolling, and at the end of rolling, the rolling mill is pulled out while rolling the tail end of the strip. It becomes a small part, and the yield is much improved compared to the conventional one, and the productivity can be increased.
[0008]
Further, since the strip tail end is loaded with a tension across the tail end of the strip is used when exiting inlet side reel of the rolling mill, it is possible to prevent meandering of the strip to prevent loss of the backward tension.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the common part in each figure, and duplication of description is abbreviate | omitted.
FIG. 1 shows a configuration diagram of a reversible cold rolling mill according to the present invention. In FIG. 1, plate speed meters 2 and 3 and thickness meters 4 and 5 are installed on the entrance / exit side of the rolling mill 1. FIG. 1 shows a system configuration in the case where a strip to be rolled proceeds from left to right toward the paper surface. The plate thickness control is based on the mass flow equation: h = H × V / v based on the signals of the plate speed meters 2 and 3 on the entry / exit side and the plate thickness meter 4 on the entry side, The estimated outlet side thickness h is compared with the target value 13 by the comparison calculator 12 to obtain a deviation, which is sent to the hydraulic pressure reduction control device 6, and the hydraulic pressure reduction device comprising the servo valve 7, the hydraulic cylinder 8, and the displacement meter 9. 16, by controlling the roll gap between the upper and lower work rolls 6.
[0010]
Reference numeral 14 denotes a computing unit that determines the passage of the strip tip from the output signal of the delivery side plate speed meter and sends a command to the hydraulic pressure reducing device.
[0011]
The operation of the present invention will be described with reference to FIG. FIG. 2 is a schematic diagram showing a state diagram of rolling in the reversible rolling mill 1 of the present invention, in which strip strips ((1), (2), (3) in the figure), acceleration / rolling / deceleration ( (4)), up to bottom (5) is shown. In FIG. 2 (1), the strip 15 is rewound from the entry-side reel 10 and fed into the rolling mill 1. This may be done manually by the operator or automatically using a threading device. Reference numeral 17 denotes a guide device. In this state, the roll gap of the rolling mill 1 is opened so as not to hinder the sheet passing. As shown in (2), when the strip 15 passes through the rolling mill and the tip reaches the plate speed meter 3 on the outlet side, the calculator 14 is operated by the hydraulic pressure reduction device 18 (the hydraulic pressure reduction control device 6 in FIG. A command is sent to the reduction device 16 (shown collectively), and the roll gap is set to a predetermined value. At the same time, the rolling mill outlet side plate thickness is calculated momentarily by the mass flow calculator 12, and the rolling mill outlet side plate thickness is controlled as described above. That is, in this state, the front tension of the rolling mill 1 has not been established yet, but the strip 15 is maintained at a predetermined thickness on the outlet side by the above-described thickness control.
[0012]
Further, the strip 15 advances and winds around the outgoing reel as indicated by (3). Here, the rolling mill exit tension is established for the first time, and the rolling mill 1 is accelerated. Acceleration, steady speed, deceleration and strip 15 are rolled (4), and as shown in (5), the entry reel 10 is pulled out at the tail end of the strip 15 at the sheet passing speed, and the plate speed meter on the entry side of the rolling mill. Thickness control is performed until 2 or the thickness gauge 4 is passed. In this state, the rear tension of the rolling mill is zero, but the outlet side plate thickness is maintained at a predetermined value by the above-described plate thickness control. Further, since the strip is likely to meander when the rear tension is lost, there is a case where a constant tension is applied across the strip by the tension load device 19 if necessary.
[0013]
In the case of reverse and rolling in the reverse direction, the plate thickness control is performed in the same manner.
[0014]
【The invention's effect】
As described above, in the reversible cold rolling mill 1 of the present invention, the sheet thickness does not fall within a predetermined value and scrap is a small part of the front and rear ends, and the yield is improved much more than before. , Increase productivity. In the reversible cold rolling mill of the present invention, when passing through, the forward tension is not established transiently, only the rear tension is established, the front and rear tensions are both established, and the front tension is established. Although there is a state where the rear tension is not established, the load fluctuation due to the presence or absence of the tension is about 5.6% according to the theoretical examination and experiment, so the above-mentioned plate thickness control can sufficiently cope with the transient state. The authors have confirmed.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a reversible rolling mill according to the present invention.
FIG. 2 is an operation explanatory diagram of the reversible rolling mill of the present invention.
FIG. 3 shows the operation of a conventional reversible rolling mill.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rolling machine 2 Plate speed meter 3 Plate speed meter 4 Plate thickness meter 5 Thickness meter 6 Hydraulic pressure reduction control device 7 Servo valve 8 Hydraulic cylinder 9 Displacement meter 10 Incoming reel 11 Take-up reel 12 Comparator 13 Target value 14 Calculator 15 Strip 16 Hydraulic reduction device 17 Guide device 18 Hydraulic reduction device 19 Tension load device

Claims (2)

A sheet thickness meter and a plate speed meter are provided on the entry / exit side of the rolling mill, and the strip is rewound from the take-up reel on the entry side and passed through the rolling mill. Rolling is started with the roll gap set to a predetermined value, and the strip end is wound around the take-up reel on the exit side of the rolling mill and the rolling is continued, and the tail end of the strip exits the entry reel of the rolling mill. Occasionally tension is applied across the tail end of the strip at the entrance to the rolling mill to prevent meandering of the strip, and at the end of rolling, the rolling mill is pulled out while rolling the tail end of the strip to the take-up reel on the exit side. Based on the rolling method of winding, the rolling of multiple passes is repeated by the same operation to produce a strip with a predetermined thickness. At this time, based on the signals of the input side thickness gauge and the input / output side speedometer Calculate the thickness of the outlet side , Resulting thickness signal is compared with the target value, and controls every moment during rolling the roll gap based on the deviation, the rolling method of the reversible cold rolling mill. This is a reversible cold rolling mill, which is equipped with a plate thickness meter and a plate speed meter at least on the entry / exit side of the rolling mill, and a hydraulic mill equipped with a hydraulic reduction device that sets a roll gap with a servo valve and a hydraulic cylinder. An arithmetic unit that detects the timing at which the leading end of the strip reaches the outlet plate speedometer based on a signal from the plate speedometer, and a hydraulic pressure reduction that sets the roll gap to a predetermined interval in response to the signal from the calculation device. And a mechanism for applying a tension across the tail end of the strip on the entry side of the rolling mill so that the strip tail end is used when the strip tail end passes through the entry reel of the rolling mill and prevents the meandering of the strip . Based on the signals from the thickness gauge and the plate speed meter on the entry / exit side, the sheet thickness on the delivery side is calculated, the obtained sheet thickness signal is compared with the target value, and the deviation is sent to the hydraulic reduction device to roll the roll gap. Characterized by the momentary control inside Rolling control apparatus for a reversible rolling mill for.

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