JPS60121B2 - Rolling method and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling method and apparatus for reducing rolling force and preventing sheet warping in different speed rolling.

In rolling metal sheets, an RD rolling method has recently been developed as a rolling method that can reduce rolling force.

In this RD rolling method, for example, as shown in FIG. 1, upper and lower work rolls a? When b is the same diameter (D, = Do), the circumferential speed of rolls a and b is changed by changing the gear ratio, etc., and the circumferential speed is set to Vo and the circumferential speed of upper work roll a, with lower work roll b on the low speed side. When the speed is V, the plate speed on the inlet side is vo, the plate speed on the outlet side is v, the plate thickness on the inlet side is , and the plate thickness on the outlet side is h, then V
, /Vo=~/h, and roll the plate c by determining the peripheral speed ratio of the upper and lower rolls so that vo=Vo, that is, the neutral point No is at the entrance of the roll bit part d (rolling entrance), and v,
Rolling is performed by determining the tension on the entry side and the exit side so that =V, 0, neutral point N, is located at the exit (rolling exit) of the roll bit part d, respectively.

According to this rolling method, the neutral point No. on the entry side is at the rolling entrance,
Since the plate is rolled so that the neutral point N, is at the rolling exit, the direction of the frictional force is reversed over the entire length of the upper and lower contact arcs, canceling each other out, and the plate being rolled is compressed in the horizontal direction. Therefore, the rolling force is not affected by frictional force, and the rolling force can be significantly reduced. However, in hot rolling, etc., depending on the rolling conditions, if rolling is performed at different speeds with upper and lower work rolls a and b of equal diameter, plate c will elongate on the high speed roll a side, resulting in After rolling, the plate may warp toward the low-speed roll b.

Also, as shown in Fig. 2, the upper and lower work rolls a and b have different diameters (D.
<Do) and rolling with the circumferential speeds of the upper and lower work rolls a and b equal (V, = Vo) has been conventionally adopted, but in this case of constant velocity of different diameters, the plate is As a result, it bends toward the upper work roll a side with a smaller diameter.

The present invention aims to prevent the warping of the plate and reduce the rolling force as in each of the above-mentioned rolling processes, by setting one of the upper and lower work rolls to a small diameter, and changing the circumferential speed of the small diameter roll to the other roll's circumferential speed. The present invention relates to a rolling method and an apparatus therefor characterized by rolling at a higher speed.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in Fig. 3, the upper and lower work rolls 1 and 2 have different diameters, so that the diameter D of the upper work roll 1 is D, and the diameter Do of the lower work roll 2 is D, × Do, and the upper work roll is made smaller in diameter. A circumferential speed regulator 3 drives the roll 1 by controlling a roll drive motor using, for example, a speed control device and a speed meter (not shown).
A circumferential speed regulator 4 having the same configuration controls the circumferential speed of the lower work roll 2, which has a large diameter, to V.
The upper work roll is controlled to Vo according to A difference in circumferential speed is provided between the circumferential speeds of the work roll 1 and the lower work roll 2 such that V,>Vo, so that differential rolling can be performed.

5 is a board, 6 is an upper backup roll, and 7 is a lower backup roll.

In a combination of rolls 1 and 2 with different diameters, if the circumferential speeds are made equal (V, = Vo), the plate will bend toward the small diameter roll as in the case of Fig. 2, but in the present invention, the roll 1 on the small diameter side peripheral speed V
, is controlled by circumferential speed regulators 3 and 4 so that the circumferential speed Vo of the large diameter roll 2 is higher than the circumferential speed Vo of the large diameter roll 2, and different speed rolling is performed with the small diameter upper work roll set to the high speed side.

As a result, the plate 5, which is trying to bend toward the small diameter roll 1 side, is bent toward the low speed side (that is, the roll 2 side) due to the elongation caused on the small diameter roll side. Curving is prevented by both the bending to the d/lower side by the rolls and the bending to the low speed side by the different speed rolls, and the product is sent in a straight state.Also, since it is rolled at different speeds, a low rolling force is required. The circumferential speeds of the upper and lower work rolls 1 and 2 may be controlled by a continuously variable transmission mechanism.

As described above, according to the present invention, rolling is performed at different speeds by combining rolls with different diameters and driving the smaller diameter roll at high speed, thereby reducing the rolling force and at the same time obtaining a straight plate. This has the excellent effect of being able to.

[Brief explanation of drawings]

FIG. 1 is a diagram of rolling by the RD rolling method, FIG. 2 is a diagram of rolling by rolls of different diameters, and FIG. 3 is a schematic diagram of the apparatus of the present invention. 1... Upper work roll, 2... Lower work roll, 3, 4
...peripheral speed regulator. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. A rolling method characterized in that rolling is performed by setting one of the upper and lower work rolls to a small diameter and driving the small diameter roll at a higher circumferential speed than the other rolls. 2 The upper and lower work rolls are a combination of rolls with different diameters, and a device is provided to control the circumferential speed of the small diameter roll to be higher than the circumferential speed of the large diameter roll, so that the different diameter rolls are driven at different speeds. A rolling equipment characterized by: