JPH05277522A - Dewatering device of rolling mill - Google Patents

Abstract

PURPOSE:To provide a dewatering device of a rolling mill which can obtain sufficiently dewatering effect in a roll bending type rolling mill, etc. CONSTITUTION:A gutter 7 to catch rolling oil (a) is set up in the neighborhood of the upper middle roll 2 on the outlet side of the rolling mill along the axial direction of the upper middle roll 2, a water gradient is set up to drain the caught rolling oil (a) to the side direction of the plate surface of the strip 4 and an air blow nozzle 8 is set up to blow off the rolling oil (a) attached to the lower surface of the gutter 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainer for a sheet rolling mill having a roll bending type shape control function.

[0002]

In temper rolling of cold-rolled steel sheets, surface-treated steel sheets, etc., rolling oil is usually injected from a nozzle provided on the inlet side of a rolling mill to improve rolling performance and surface quality. ing.

After the rolling, it is necessary to sufficiently wipe and remove the rolling oil from the strip plate surface in order to prevent erroneous detection in the subsequent surface flaw inspection step. As a so-called draining device for wiping off the rolling oil, for example, as described in Japanese Utility Model Laid-Open No. 58-28716, an air blow device is provided on the work roll outlet side, and air is jetted to the strip plate surface to roll the rolling oil. There are known devices and the like for wiping.

[0004]

However, as shown in FIG. 4 and FIG.
In a 6-stage roll bending type rolling mill consisting of a pair of upper and lower work rolls 1, an intermediate roll 2 and a backup roll 3 as shown in Fig. 7, a sufficient draining effect can be obtained even if the above conventional drainer is applied. I couldn't do it.

That is, in the above rolling mill, the rolling oil a jetted from the inlet side nozzle 5 is drained by the air jetted from the outlet side air wiper nozzle 6, but remains on the surface of the work roll 1. Rolling oil a is work roll 1
Is transferred to the intermediate roll 2. In the operation of the rolling mill, the bender of the intermediate roll 2 or the work roll 1 is used to control the thickness distribution in the plate width direction, that is, the cross-sectional shape.

Therefore, when the bending amount of the intermediate roll 2 exceeds a certain value, the linear pressure at the central portion between the intermediate roll 2 and the backup roll 3 becomes 0 (thick line portion) as shown in FIG. As described above, since a minute gap is generated in the central portion between the rolls 2 and 3, the rolling oil a transferred to the intermediate roll 2 flows out from this gap to the exit side of the rolling mill by the rotation of the roll, and the roll is rotated. It was found that the centrifugal force of (3) scatters on the plate surface of the strip 4 (drops off), resulting in poor drainage.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a water draining device for a rolling mill which can obtain a sufficient water draining effect in a roll bending type rolling mill or the like.

[0008]

In order to achieve the above object, the present invention provides a gutter near the upper intermediate roll on the delivery side of the rolling mill along the axial direction of the upper intermediate roll for collecting rolling oil. It is characterized by being installed together.

Further, the gutter was provided with a water gradient for flowing the collected rolling oil to the side of the strip plate surface and an air blower for blowing off the rolling oil adhering to the lower surface of the gutter.

[0010]

[Operation] When the roll bender becomes stronger, the rolling oil droplets that pass through the gap between the intermediate roll and the backup roll and are scattered to the outlet side of the rolling mill are reliably collected by the gutter to prevent plate surface contamination. To be done.

Further, the collected rolling oil is discharged to the side of the strip plate surface due to the water gradient on the bottom of the gutter, and the rolling oil adhering to the bottom surface of the gutter is blown off by the air blower, so that the draining effect is more reliable. To be achieved.

[0012]

1 and 2, 1 is a work roll, 2
Is an intermediate roll, 3 is a backup roll, 4 is a strip, 5 is a rolling oil nozzle provided on the inlet side of the rolling mill, and 6 is an air wiper nozzle provided on the outlet side.

On the delivery side of the rolling mill, a rolling oil a is collected along the axial direction of the upper intermediate roll 2 and flowing out from between the upper intermediate roll 2 and the backup roll 3 and scattered. A gutter 7 is installed.

As shown in FIG. 2, the bottom plate 7a of the gutter 7 is provided with a water gradient sloping down to both sides so that the collected rolling oil a is discharged to the side of the strip 4 plate surface. I am doing it.

An air blow nozzle 8 is attached to the lower surface of the gutter bottom plate 7a to prevent the rolling oil a from dripping so that the rolling oil a adhering to the lower surface of the gutter 7 can be blown off to both sides by air injection. Is becoming

In order to collect the droplets of the rolling oil a scattered on the plate surface of the strip 4, it is sufficient to block the range of the projection angle of the scattering with the gutter 7, but as shown in FIG. Gutter 7
If the water draining plate 9 in contact with the upper intermediate roll 2 is attached to the top end of the bottom plate 7a, the water draining effect can be achieved more reliably.

Since this draining plate 9 is in contact with the intermediate roll 2, it can be used without causing problems such as scratches on the work roll 1 and deterioration of roll roughness.

[0018]

As described above, according to the present invention, when the roll bender force becomes high, the droplets of rolling oil that pass through the gap between the intermediate roll and the backup roll and are scattered to the outlet side of the rolling mill are Since it is reliably collected by the gutter, stains on the plate surface are prevented and a sufficient draining effect is obtained.

Further, the collected rolling oil is discharged to the side of the strip plate surface due to the water gradient at the bottom of the gutter, and the rolling oil adhering to the bottom surface of the gutter is blown off by the air blower, so that the draining effect is more reliable. To be achieved.

By the way, when the present invention is applied, the passing rate in the subsequent surface flaw inspection apparatus (ASI) can reach 100%, and erroneous detection can be prevented.

[Brief description of drawings]

FIG. 1 is a side view of a rolling mill showing an embodiment of the present invention.

FIG. 2 is a front view of the gutter.

FIG. 3 is a side view of essential parts showing another embodiment of the present invention.

FIG. 4 is a side view showing a conventional drainer of a rolling mill.

FIG. 5 is a rear view of the same.

FIG. 6 is a diagram showing a linear pressure distribution between the rolls.

[Explanation of symbols]

 1; work roll 2; intermediate roll 3; backup roll 4; strip 5; rolling oil nozzle 6; air wiper nozzle 7; gutter 8; air blow nozzle 9; draining plate a; rolling oil

Claims (2)

[Claims] 1. A drainer for a rolling mill, wherein a gutter for collecting rolling oil is installed near the upper intermediate roll on the delivery side of the rolling mill along the axial direction of the upper intermediate roll. .. 2. The gutter is provided with a water gradient for discharging the collected rolling oil to the side of the strip plate surface, and an air blower for blowing off the rolling oil adhering to the lower surface of the gutter. The water draining device of the rolling mill according to claim 1.