JPS6281212A - Method and device for controlling rolling load in special rolling with different peripheral speed - Google Patents

Abstract

PURPOSE:To control the plate thickness in the length direction of a metallic plate with holding a rolling load constantly and to increase the dimensional accuracy by controlling the gap value of driving roll based on the detection result of the rolling load of the driving roll. CONSTITUTION:The strip 20 delivered from the rewinder 12 which is arranged at the inlet side of a rolling mill 11 is wound on the peripheral face of the inlet side contact roll 17 and further after winding on the peripheral face of the outlet side contact roll 18 is wound on a winder 13 arranged at the outlet side. The rolling load of contact rolls 17, 18 is detected by a load cell 14 and transmitted to a rolling reduction control device 16. The rolling is performed by holding the rolling load at the same fixed value as that of the rolling initial load all the time by controlling a rolling reduction driving device 23 with its driving via a rolling load arithmetic unit 21, gap arithmetic unit 22. In this way, the dimensional accuracy can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a rolling load control method and apparatus in 1% circumferential speed special rolling.

[Prior art 1] Conventionally, as a special rolling equipment with different circumferential speeds, for example, U.S. Patent No. 3
CBS (Coata) as shown in No. 2387511
ct-Bend-3tretch) rolling equipment proposed? %.

Wangji different circumferential speed rolling installation is as shown in No. 2111.

Large diameter drive contact rolls 1 and 2 are arranged and 1
Near the gap between both contact rolls 1 and 2.

A non-driven floating roll 3 having a diameter slightly larger than the gap and sufficiently smaller than both contact rolls 1 and 2.
, and pass the strip 4 as shown in Fig. 2.
Inlet tension Tl and outlet tension T2 are applied to the strip 4, and the circumferential speed of the inlet contact roll 1 (low speed side) is made slower than the circumferential speed of the outlet contact roll 2 (high speed side). The strip 4 is driven and rotated in the gap between the non-driven floating roll 3 and both contact rolls 1 and 2.
This makes it possible to roll. 5 is an unwinding machine, and 6 is a winding machine.

According to the above-mentioned different circumferential speed special rolling equipment, since the floating roll 3 with a relatively small diameter is used and the different circumferential speed rolling is carried out, ordinary two-high rolling, four-high rolling,
Compared to PV rolling as shown in No. 10825, the rolling load and rolling roll 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 for a long time by the above-mentioned different circumferential speed special rolling, the friction coefficient increases due to the temperature rise of the driving roll and the non-driving floating roll, and the rolling load increases. The thermal crown of the roll increases,
There is a problem in that the thickness deviation in the length direction of the metal plate increases.

An object of the present invention is to make it possible to suppress the occurrence of plate thickness deviation in the length direction of a metal plate rolled by special rolling at different circumferential speeds.

[Means for Solving the Problems] In the rolling load control method for special rolling at different peripheral speeds according to the present invention, two or more drive rolls are disposed with a gap in between, and a roll is placed closer to the gap than the gap. In a rolling load control method for special rolling at different circumferential speeds, which uses a rolling mill that has slightly larger non-driven floating rolls and rolls a metal plate in the gap between the re-driving roll and the floating roll, the rolling load that acts on the driving roll is detected, and the gap value of the driving rolls is controlled based on the detection result of the rolling load, so that the pressing load is kept constant.

The rolling load control device for special rolling at different circumferential speeds according to the present invention arranges two or more driving rolls with a gap in between, and arranges a non-driven floating roll that is slightly larger than the gap near the gap. , a rolling load control device for special rolling at different circumferential speeds using a rolling mill that rolls a metal plate in the gap between a re-driving roll and a floating roll; In order to keep the rolling load constant, the rolling force control device includes a pressure F control device that controls the gap value between the drive rolls based on the detection result of the rolling load detector.

[Function] According to the present invention, even when rolling a metal plate for a long time, it is possible to continue rolling while keeping the rolling load constant, thereby suppressing the occurrence of plate thickness deviation in the length direction of the metal plate. It becomes possible to do so.

[Example] FIG. 1 is a schematic diagram showing an example of a rolling equipment 10 to which the present invention is applied. The rolling equipment 10 includes a rolling mill 11 and an unwinding machine 12.
1 winder 13, load cell 14 as a rolling load detector
, a rolling down device at15, and a rolling down control device 116.

Rolling 4I! In &11, two contact rolls 17.18 as drive rolls are arranged with a gap between them, and a roll gap slightly larger than the roll gap between the two contact rolls 17.18 is placed in the vicinity of both contact rolls 17.18. A non-driven floating roll 19 is arranged, the diameter of which is significantly smaller than that of the rolls 17,18. This makes rolling! The strip 20 unwound from the unwinding fi 12 disposed on the inlet side of the glt is transferred to the inlet side contact roll 1.
7, then around the floating roll 19, further around the exit contact roll 18, and then taken up by the winder 13 located on the exit side. It is said that Further, the rolling mill 11 applies an entrance tension T1 and an exit tension T2 to the strip 20, and also moves both contact rolls 17 and 18 in the same direction so that the strip 20 advances toward the exit side.
Both contact rolls 17.18 are driven so that the circumferential speed v1 of the contact roll 17 on the input side is at least slower than the circumferential speed v2 of the contact roll 18 on the output side, and the strip 20 is transferred to both contact rolls 17.1.
Rolling is possible in each gap formed between each of the rollers 8 and the floating roll 19.

Therefore, in this rolling equipment 10, the rolling load acting on the contact rolls 17, 18 can be detected by the load cell 14, and the detection result can be transmitted to the rolling control device 16.

The rolling reduction device 16 includes a rolling load calculating device 21, a gap calculating device 22, and a rolling driving device 23. The rolling load calculation device 21 converts the rolling load at the initial stage of rolling into a reference rolling load P.
O, and calculate the load deviation ΔP between the rolling load P during subsequent rolling and the reference rolling load PO,
The zero gap calculation device 22 transmits the calculation result to the gap calculation device 22, and the contact rolls 17 and 18 necessary for the rolling load during rolling to maintain the initial state, that is, for the above-mentioned load deviation ΔP to become O. The gap adjustment value ΔS is calculated and the calculation result is transmitted to the rolling down drive device 23. The rolling drive device 23 drives and controls the pressing device 15 so that the gap between the contact rolls 17 and 18 is changed by the gap i*tΔS.

Therefore, according to this embodiment, even when rolling the strip 20 for a long time, it is possible to continue rolling while keeping the rolling load at the constant value PO, which is the same as the initial rolling load, and the length of the strip 2o It becomes possible to suppress the occurrence of plate thickness deviation in the direction.

FIG. 3 is a diagram showing the change in rolling load over time during special rolling at different circumferential speeds performed using the old friend rolling mill 11 for the conventional method and the method of the present invention. It is recognized that stable rolling is possible.

FIG. 4 is a diagram showing the plate thickness deviation in the longitudinal direction of the metal plate in the special rolling at different circumferential speeds performed using the rolling mill 11 for the conventional method and the method of the present invention. The steel type is stainless steel 5US430, and this is the result of rolling a coil with a plate width of 150 mm and a plate thickness of 7 oJL to a plate thickness of 5 o JL. It is recognized that the present invention significantly reduces the plate thickness deviation.

Note that the present invention is not only applied to the rolling equipment IO equipped with the rolling mill 11 shown in FIG.
) to (H) are also widely applicable to rolling equipment equipped with compressors shown in each of (H).

FIG. 5(A) shows that in the different circumferential speed special rolling mill 11,
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. 5(B) is a schematic diagram showing a rolling method in which the winding angle of the streaks and rolls 20 with respect to the circumferential surface of the contact roll 17 is minimized in the same rolling mill 11.

Moreover, FIG. 5(C) shows the strip 20 on the circumferential surface of both contact rolls 17 and 18 in the same rolling process.
FIG. 2 is a schematic diagram showing a rolling method in which the winding angle is made smaller.

FIG. 5(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 third drive roll 33. FIG. 3 is a schematic diagram showing a rolling method using a 1.1-speed special rolling mill 30 in which a second floating roll 35 is arranged. The metrology 2p 20 includes a first drive roll 31,
The second driving rolls 32 are rolled in the gaps formed between each of the second driving rolls 32 and the first floating rolls
, each of the third drive roll 33 and the second floating roll 35
It is rolled in the gap formed by the .

FIG. 5(E) shows the upper roll 41, the first drive roll 42,
It is a schematic diagram showing a rolling method using a special rolling machine 40 with different circumferential speeds, 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. . The strip 20 is rolled on both drive rolls 42.
43 and the floating roll 45, and the rolls 1-, 41 and the first driving roll 42 are rolled.
and the gap between the second drive roll 43 and the lower roll 4
It is rolled in the gap formed by 4.

FIG. 5(F) shows the first drive roll 51. Different circumferential speed special rolling in which the second driving roll 52 and the third driving roll 53 are arranged in a triangular shape, and the floating roll 54 is arranged in the center of the gap formed by each of the driving rolls 51 to 53 in the phase 77'. 5 is a schematic diagram showing a rolling method using a machine 50. FIG. strip 2
0 is rolled in the gap formed between each of the drive rolls 51 to 53 and the floating roll 54.

FIG. 5(G) shows the same rolling mill 50 as in FIG. 5(F).
, the strip 20 is transferred to a first drive roll 51 . FIG. 6 is a schematic diagram showing a rolling method in which rolling is performed in gaps formed between each of the third drive rolls 53 and a floating roll 54.

In FIG. 5(H), the first drive roll 61, the second drive roll 62, and the third drive roll 63 are arranged in a triangular shape, and each of the drive rolls 61 to 63 is placed approximately in the center of the gap formed between each other. It is a schematic diagram which shows the rolling method by the different circumferential speed special rolling mill 60 which arrange|positions the 1st rf, idle roll 64, and the 2nd floating roll 65. The strip 20 is formed by the gap between the first driving roll 61 and the first floating roll 64, and the second driving roll 62.
and the first floating roll 64, the first floating roll 6
Rolling is performed in the gap between the third driving roll 63 and the second floating roll 65, and the gap between the third driving roll 63 and the roll 65.

[Effects of the Invention] As described in -1- below, according to the rolling load control method and device for different circumferential speed special rolling according to the present invention, the rolling load can be kept constant even when rolling a metal plate for a long time. Continuing rolling with the metal plate becomes rotation, and it becomes possible to suppress the occurrence of plate thickness deviation in the length direction of the metal plate.

[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 with different peripheral speeds, and Fig. 3 is a schematic diagram showing an example of a special rolling mill with different peripheral speeds. Figure 4 is a diagram showing the changes in thickness, and Figure 5 is a diagram showing the thickness deviation in the longitudinal direction of the metal plate obtained by special rolling at different circumferential speeds.
) is a schematic diagram showing another example of a special rolling mill with different circumferential speeds. DESCRIPTION OF SYMBOLS 10... Rolling equipment, 11... Rolling machine, 12... Unwinder, 13... Winder, 14... Load cell (rolling load detector), 16... Rolling down control device, 17.18・
...Contact roll, 19...Floating roll, 20.
...Sto1 no npu. Agent Patent Attorney Osamu Shiokawa Figure 1 Figure 3 Figure 4! Nisa +TLl Hana 5 Figure fA) Figure 5 (B) 5th (C)

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 rolling load control method in different peripheral speed special rolling using a rolling mill, a rolling load acting on a drive roll is detected, a gap value of the drive roll is controlled based on the detection result of the rolling load, and the A rolling load control method in special rolling at different circumferential speeds, which is characterized by keeping the rolling load constant. (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 placed near the gap, and the metal plate is held in the gap between both drive rolls and the floating roll. A rolling load control device for special rolling at different circumferential speeds using a rolling mill includes a rolling load detector for detecting a rolling load acting on a drive roll, and a rolling load detector for keeping the rolling load constant. 1. A rolling load control device for special rolling at different circumferential speeds, comprising: a rolling reduction control device that controls a gap value between driving rolls based on the detection result of the above.