JPS6289518A - Method and apparatus for special rolling metal plate - Google Patents

Abstract

PURPOSE:To stably roll a metal plate in a small deviation of a plate thickness by detecting the outlet side plate thickness on a rolling mill and controlling a peripheral speed ratio of driving rolls so that the plate thickness is allowed to coincide with a target plate thickness set previously. CONSTITUTION:The outlet side plate thickness of the rolling mill 11 is detected by a plate thickness detecting device 14 under contacting or noncontacting condition, then the detected results are transmitted to a an arithmetic unit 15 for the peripheral speed ratio. A new peripheral speed ratio of contacting rolls 17, 18 is calculated by the arithmetic unit 15 for the peripheral speed ratio based on a deviation between the detected outlet side plate thickness and the target outlet side plate thickness to eliminate the deviation, then the calculated result is transmitted to a roll speed control device 16. A loaded electric current of one side or both motors 17A, 18A driving the contacting rolls 17, 18 is controlled by the roll speed control device 16 to attain the calculated peripheral speed ratio. In this way, a strip 20 is rolled stably in the state of controlling the outlet plate thickness into the target value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a special rolling method and Jc rolling method for metal plates.

[Prior art] Conventionally, as a special rolling equipment with different circumferential speeds, for example, U.S. Pat.
CBS (Conta) as shown in No. 23875Ei
ct-Bend-Stretch) rolling equipment is proposed.

As shown in FIG. 2, the variable circumferential speed rolling equipment is equipped with large-diameter driven contact rolls 1 and 2, and near the gap between both contact rolls 1.2, with a diameter slightly larger than the gap, In addition, a non-driven float having a diameter sufficiently smaller than both contact rolls 1 and 2 is placed on the roll 3, and the strip 4 is passed through it as shown in FIG. At the same time, the input side contact roll 1 (low speed side) is driven and rotated so that the peripheral speed is lower than the peripheral speed of the exit side contact roll 2 (high speed side), and both the non-driven floating roll 3 and both The strip 4 can be rolled in the gap between the contact rolls 1 and 2. 5 is an unwinding machine, and 6 is a winding machine.

According to the above-mentioned different circumferential speed special rolling equipment, since floating rolls 3 with a relatively small diameter are used and rolling is carried out at different circumferential speeds, ordinary two-high rolling, four-high rolling, and
Compared to Pv rolling as shown in No. 10825, the rolling load and rolling torque are smaller, making it possible to efficiently roll extremely thin metal sheets.

[Problems to be Solved by the Invention] However, when rolling a metal plate using the above-mentioned different circumferential speed special rolling equipment, a slip phenomenon of the metal plate may occur because the non-driven floating roll is not driven. The rolling reduction rate changes due to a change in the roughness or lubrication state of the drive roll, and there is a risk that the exit side of the rolling mill will have a thickness deviation that is significantly different from a preset target thickness.

An object of the present invention is to enable rolling of a metal plate with a small thickness deviation.

[Means for Solving the Problems] The special method for rolling a metal plate according to the present invention includes arranging two or more drive rolls with a gap in between, and a roll in the vicinity of the gap that is slightly larger than the gap. In a special rolling method for metal plates using a rolling mill in which non-driven floating rolls are arranged and the metal plate is rolled in the gap between both driving rolls and the floating rolls, the plate thickness at the exit side of the rolling mill is detected. The circumferential speed ratio of the drive roll is adjusted so that the exit side plate thickness matches a preset target plate thickness.

The special rolling machine for metal sheets according to the present invention has two or more drive rolls arranged with a gap in between, and a non-driven floating roll that is slightly larger than the gap in the vicinity of the gap, and both drive rolls. In a special rolling machine for metal plates, which uses a rolling mill that rolls a metal plate in the gap between a floating roll and a floating roll,
A plate thickness detector detects the outlet side plate thickness of the rolling mill, and a circumferential speed that calculates a new circumferential speed ratio of the drive roll necessary for the detected outlet side plate thickness to match the preset target plate thickness. This apparatus includes a ratio calculation device and a roll speed control device that controls the speed of the drive roll using the calculated circumferential speed ratio.

[Function] In the special rolling at different circumferential speeds, the inlet side plate thickness hl and the outlet side target plate thickness h2 of the rolling mill are determined by the inlet drive roll speed Vl and the outlet drive roll speed 2, so that Vl・hl = V2 h2
... Defined in (1). For example, when the exit drive roll speed is V2O, the exit side plate thickness is h2+Δh
2, set the exit drive roll speed to V20+ΔV
By adjusting to 2, it becomes possible to obtain the target outlet side plate thickness h2. In this case, V2O・(h2+Δh2) = (V20+ΔV2) Cloudy h2
- (2) The following relationship is established, and the adjustment of the exit roll speed φΔV2 is Δv2 = V2O・(Δh2/h2)・
... (3), and the circumferential speed ratio of the drive roll is
Before adjustment (7) V 10 / V 2 (l et al., after adjustment V
IO/(V20+ΔV2)”・(4).

Therefore, according to the present invention, the circumferential speed ratio of the drive roll is adjusted according to the equations (3) and (4) based on the detection of the deviation lance Δh2 of the exit side plate thickness with respect to the target plate thickness. This makes it possible to roll the metal plate to the target thickness.

[Example] FIG. 1 is a schematic diagram showing an example of a rolling facility IO to which the present invention is applied. Rolling order 10 is rolling mill 11. Unwinding machine 12
, winder 13, plate thickness detector 14, circumferential speed ratio calculation device 15,
The rolling mill 11 has a roll speed control device 16. The rolling mill 11 has two contact rolls 17.18 as driving rolls arranged with a gap between them, and one contact roll 17.18 in the vicinity of both contact rolls 17.18. A non-driven floating roll 19 having a diameter slightly larger than the roll gap 17, 18 and sufficiently smaller than the diameter of both contact rolls 17, 18 is arranged. As a result, the strip 20 unwound from the unwinding machine 12 disposed on the input side of the rolling mill 11 is wound around the peripheral surface of the input side contact roll 17, and then wrapped around the peripheral surface of the floating roll 19. Further, after being wound around the circumferential surface of the outlet side contact roll 18, it is possible to wind it up on a winder 13 disposed on the outlet side. The rolling mill 11 also applies an entrance tension TI to the strip 20.
, both contact rolls 1 are applied so that the tension T2 on the exit side is applied and the strip 20 advances toward the exit side.
Following 7.18, drive both contact rolls 17 and 18 in the same direction, and so that the circumferential speed Vl of the contact roll 17 on the entry side is at least slower than the circumferential speed v2 of the contact roll 18 on the exit side. , strip 20
can be rolled in the gaps formed between each of the contact rolls 17 and 18 and the floating roll 19.

Therefore, in this rolling equipment 10, the plate thickness detector 1
4 detects the outlet side plate thickness of the rolling mill 11 in a contact or non-contact state, and transmits the detection result to the circumferential speed ratio calculation device 15.
The 0 peripheral speed ratio calculating device 15, which has a +7 function, calculates the contact roll 17. based on the deviation edge Δh2 between the detected exit side plate thickness and the target exit side plate thickness h2 to eliminate this deviation.
18 new circumferential speed ratios are calculated using equations (3) and (4), and the calculation results are transmitted to the roll speed control device 16. The roll speed control device 16 controls the load current value of one or both of the drive motors 17A and 18A of the contact rolls 17 and 18 so as to achieve the calculated circumferential speed ratio.

As a result, the strip 20 has an exit side plate thickness of the target value h2.
Stable rolling is achieved under controlled conditions.

FIG. 3 is a diagram showing the plate thickness deviation in the strip length direction in the special rolling at different circumferential speeds performed using the above-mentioned rolling installation 1110 for the conventional method and the method of the present invention.

The steel type is stainless steel 19430, and the plate width is 150cm.
(2) This is the result of rolling a coil of plate thickness 5oIL to a plate thickness of 5Q7zm.0 It is recognized that the plate thickness deviation is significantly reduced by the present invention.

Note that the present invention is not only applied to the rolling installation 1110 equipped with the rolling mill 11 shown in FIG. 1 above, but also applied to rolling equipment equipped with the rolling mills shown in FIGS. is also widely applicable.

FIG. 4(A) shows that in the different circumferential speed special rolling all,
FIG. 3 is a schematic diagram showing a rolling method in which the winding angle of the strip 20 around the circumferential surface of the contact roll 18 is made smaller. Moreover, FIG. 4(B) shows how much the strip 20 is against the circumferential surface of the contact roll 17 in the same rolling process l111.
! FIG. 2 is a schematic diagram showing a rolling method in which the application angle is made smaller. Moreover, FIG. 4(C) is a schematic diagram showing a rolling method in which the winding angle of the strip 20 with respect to the circumferential surfaces of both contact rolls 17 and 18 is made smaller in the same rolling process 1111.

FIG. 4(D) shows the first drive roll 31, the second drive roll 32. The third drive rolls 33 are arranged in tandem, the first floating roll 34 is arranged near the gap between the first drive roll 31 and the second drive roll 32, and the first floating roll 34 is arranged near the gap between the second drive roll 32 and the first drive roll 31. FIG. 3 is a schematic diagram showing a rolling method using different circumferential speed special rolling 41!30 in which a second floating roll 35 is arranged. The strip 20 is rolled in gaps formed between each of the first driving roll 31 and the second driving roll 32 and the first floating roll 34, and the second driving roll 32,
Rolling is performed in the gap formed between each of the third driving rolls 33 and the second floating roll 35.

FIG. 4(E) shows the first roll 41 and the first drive roll 42.
, a schematic diagram showing a rolling method using a different peripheral speed special rolling machine 40 in which a second drive roll 43 and a lower roll 44 are arranged in tandem, and a floating roll 45 is arranged near the gap between both drive rolls 42 and 43. be. The strip 20 is rolled in the gap between each of the drive rolls 42, 43 and the floating roll 45, and in the gap between the upper roll 41 and the first drive roll 4.
2 and the gap between the second drive roll 43 and the lower roll 44.

In FIG. 4(F), the first drive roll 51, the second drive roll 52, and the third drive roll 53 are arranged in a pentagonal shape, and each of the drive rolls 51 to 53 floats in the center of the gap between them. Different circumferential speed special rolling mill 50 with rolls 54 arranged
FIG. The strip 20 is connected to each of the driving rolls 51-53 and the floating roll 54.
It is rolled in the gap formed by the .

FIG. 4(G) shows a rolling mill 50 similar to FIG. 4(F) above.
FIG. 3 is a schematic diagram showing a rolling method in which the strip 20 is rolled in gaps formed between each of the first drive roll 51, the third drive roll 53, and the floating roll 54.

FIG. 4(H) shows a first drive roll 61, a second drive roll 62, and a third drive roll 63 arranged in a triangular shape, and the approximate center of the gap formed by each of the drive rolls 61 to 63. FIG. 3 is a schematic diagram showing a rolling method using a special rolling mill 60 with different circumferential speeds in which a first floating roll 64 and a second floating roll 65 are arranged. The strip 20 is connected to the first drive roll 61 and the first
The gap formed by the floating roll 64, the gap formed by the second drive roll 62 and the eleventh idle roll 64, 1st ff! Rolling is performed in the gap between the idle roll 64 and the second floating roll 65 and the gap between the third drive roll 63 and the second floating roll 65, respectively.

[Effects of the Invention] As described above, according to the special method and apparatus for rolling a metal plate according to the present invention, it is possible to stably roll a metal plate with a small thickness deviation.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing an example of rolling equipment to which the present invention is applied, Fig. 2 is a schematic diagram showing an example of a special rolling mill at different circumferential speeds, and Fig. 3 is a metal plate obtained by special rolling at different circumferential speeds. Diagrams showing plate thickness deviation in the longitudinal direction, and FIGS. 4(A) to 4(H) are schematic diagrams showing other examples of the different circumferential speed special rolling mill. DESCRIPTION OF SYMBOLS 10... Rolling equipment, 11... Rolling machine, 14... Plate thickness detector, 15... Circumferential speed ratio calculating device, 16... Roll speed control device, 17.18... Contact roll ,
19...Floating roll, 20...Strip. Agent Patent attorney Osamu Shiokawa 1 Figure 4 (A) Figure 14 (B) Figure 40 (C) Figure 4 CF)

Claims (2)

[Claims] (1) Two or more drive rolls are placed with a gap in between, and a non-driven floating roll that is slightly larger than the gap is placed near the gap, and a metal plate is placed in the gap between both drive rolls and the floating roll. In a special rolling method for metal plates using a rolling mill, the plate thickness at the outlet side of the rolling mill is detected, and the drive rolls are adjusted so that the detected plate thickness at the outlet side matches a preset target plate thickness. A special rolling method for metal plates characterized by adjusting the circumferential speed ratio. (2) Two or more drive rolls are arranged with a gap in between, and a non-driven floating roll that is slightly larger than the gap is arranged near the gap, and the metal plate is held in the gap between both drive rolls and the floating roll. In a special rolling device for metal plates using a rolling mill, a plate thickness detector detects the outlet side plate thickness of the rolling mill, and the detected outlet side plate thickness matches a preset target plate thickness. A metal comprising: a circumferential speed ratio calculating device for calculating a new circumferential speed ratio of the drive roll necessary for Special plate rolling equipment.