JPS5893503A - Rolling mill - Google Patents

Abstract

PURPOSE:To obtain target profiles by interposing a rolling reduction roll between a work roll and a backup roll and selecting the positions of sliding rolls suitably. CONSTITUTION:Four-stages rolling mills are constituted of work rolls 2, 2' and backup rolls 3, 3' which are located above and below with a steel plate 1 in- between. A rolling reduction roll 4 is interposed between, for example, the roll 2 and the roll 3. A stationary roll 5 is provided to the roll 4 at the center in the transverse direction of the plate, and sliding rolls 7, 7' having respectively the same outside diameter as that of the stationary roll are fitted freely slidably to roll shafts 6, 6' which are provided in one body with said roll and projected to the right and left. The sliding rolls are provided respectively with cylindrical roll shafts 8, 8' projecting on the outer sides thereof, which are fitted to the shafts 6, 6' and are supported by bearings 9, 9'. Projections 10, 10' are provided to the cylindrical roll shafts, and are fitted to a coupling members 11, 11'. Supporting arms 12, 12' are mounted to the coupling members and are moved to the right and left by means of moving devices.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling mill used for continuous rolling of steel plates, skin chairs, and the like.

In rolling steel plates continuously or in rolling to make shape corrections such as skins/4's, the conventional method of making corrections by applying force using a four-high rolling mill has been adopted, but the correction ability is not sufficient. Ta.

In addition, when rolling a double-width material for cold rolling during hot rolling, etc., and then slitting it into two parts in the width direction and directing each coil to cold rolling, the cross-sectional direction of the sheet is ,
When the center slit is made, the cross section of each coil is in the shape of 4', and when it is cold rerolled, the elongation of the left and right sides is different, and the curved shape of the plate is , there was a problem that shape defects occurred.

It is an object of the present invention to provide a rolling mill that can solve the above-mentioned problems of the present invention by interposing a reduction roll between the work roll and the straight roll.

The structure of the present invention will be explained in detail based on an embodiment shown in FIGS. 1 and 2. A steel plate 1 is sandwiched and rolled in 4 stages with lower work rolls 2, 2' and 3' and 3' lower work rolls. Configure machine A. Then, a reduction roll 4 is interposed between the upper work roll 2 and the upper work roll 3.

This reduction roll 4 is constructed as shown in FIG. That is, the fixed roll 5 is provided at the center in the board direction,
- Slide rolls 7° 7', each having the same outer diameter as the fixed roll 5, are slidably fitted to roll shafts 6, 6' that are integrally provided with the fixed roll 5 and protrude to the left and right. . Both slide rolls 7 and 7' are on the outside (away from the center)
The cylindrical roll shaft 8° 8' is horizontally protruded from the roll shaft 6,
6' and is pivotally supported by bearings 9, 9'. A projection 10.1 is provided on the outer periphery of the shaft end of the cylindrical roll shafts 8, 8', respectively.
0' is provided in a protruding manner, and is fitted and connected to the connecting members 1 and 1f.

This connecting member 11, 1.1' is connected to the support arm 12.12, respectively.
Although not shown in the drawing, it is moved from side to side by a moving drive device such as a hydraulic cylinder.

This embodiment is constructed as described above, and both slide rolls 7I7' are connected to the supporting arms 12 and 12 according to the width of the steel plate l.
Rolling is performed by sliding the plate so that it is positioned on the edge of the plate.

In a roll cycle such as hot rolling, rolling is generally performed sequentially from a wide mill to a narrow mill. For example, as shown in Figure 3, 150
Rolling is performed sequentially from a 0-width machine to a 1200W width machine and a 900W width machine. The positions of the slide rolls 7 and 7' at this time are shown in FIGS. 4(a) and 4(b).

As shown in (c), they are respectively positioned on the ends of the steel plate 1.

In FIG. 4, the fixed roll 5 and slide roll 7.7 each have a width of 300 m.

The profile (thickness deviation) of the steel plate in the cross-sectional direction at this time is shown in FIG. In FIG. 5, the solid line shows the rolling state in the conventional four-high rolling mill, and the broken line shows the rolling state when using the apparatus of the present invention. In Fig. 5(a), (a) shows the state when the slide roll 7 is positioned on the edge of the steel plate l, and (b) shows the state when the slide roll 7 is slightly positioned as shown in Fig. 4 (,). This shows the state when it is located on the center side.

As is clear from Fig. 5, especially in the first half of the cycle, in the wide width mill, the amount of change in the profile is reduced because the pending force is no longer applied to the strip width edge side as in the conventional four-high rolling mill, and the crown In large areas, it will be less than half of the conventional value. - In the above embodiment, it was explained that the reduction roll 4 was interposed between the upper work roll 2 and the backup roll 3, but between the lower work roll / and the backup roll 3' It may be provided.

Since the present invention has the structure and operation as described above, it is possible to obtain a desired profile by appropriately selecting the position of the slide rolls 7, 7'.

[Brief explanation of the drawing]

The figure shows one embodiment of the rolling mill according to the present invention.
The figure is a front view, a half-cut front view with enlarged main parts of figure 2, and figure 3.
The figure shows a bending diagram showing the core cycle of a steel plate, Figure 4 is a front view showing the position of the slide roll according to the plate width, and Figure 5 shows a cross-sectional profile diagram showing the plate thickness distribution according to the plate width. Show each. 2 in Figure L. ' is a work roll, 3.3' is a support roll, 4 is a reduction roll, 5 is a fixed roll, and 7.7' is a slide roll.

Claims (1)

[Claims] A reduction roll is interposed between either the upper or lower work roll and the parafludge roll, with a fixed roll provided in the center and slide rolls movably provided on the left and right sides having the same outer diameter as the fixed roll. rolling mill.