JPS6393401A - Cross rolling method - Google Patents

Abstract

PURPOSE:To permit improvement in centering accuracy, etc., by providing a centering device to the inlet side of edger rolls of a cross rolling mill and executing cross rolling after centering the rear end of a rolled stock. CONSTITUTION:The position detector 5 for the rear end of the rolled stock, the centering device 6 and a side guide device 7 are disposed to the inlet side of the cross rolling mill along a transporting table 3. The detector 5 is a position detector of a non-contact type or contact type and the detection signal thereof is inputted to the centering device 6. The detector 5 detects the rear end of the rolled stock 1 when the rolled stock 1 is transported on the table 3. The gap of the rollers 8 of the device 6 is then narrowed down to the width of the rolled stock 1 and the centering of the rear end is executed. The rolled stock 1 is then subjected to the cross rolling by the edger rolls 2. The centering accuracy is improved by the simple equipment and the cambering of the rolled stock 1 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a width reduction rolling method in which a rolled material is centered and width reduction rolled.

(Prior Art) Conventionally, width reduction rolling is performed after centering the front part of the rolled material using a side guide device placed near the roll on the entry side of the edger roll of a width reduction rolling mill. In other words, the interval between the two opposing guide members of the side guide device is made larger than the width of the rolled material until the rolled material enters, so that the tip of the rolled material does not hit the guide member when it enters. After entering, the operation of the conveyor table is temporarily stopped and the rolled material is kept stationary, and the guide member is operated to center the rolled material at the front part.

After centering, when the guide member is returned to its original position, the conveying table is operated again to cause the rolled material to be bitten by the edger roll.

Width reduction rolling is being carried out.

(Problem to be Solved by the Invention) In the above side guide device, when the rolled material becomes long, the length of the parallel portion of the guide member is shorter than the length of the rolled material, so centering is performed with sufficient accuracy. It is not possible.

Therefore, as a method to improve centering accuracy,
For pressing the guide member, it is possible to strengthen the force or increase the size of the guide member, but there are limits to their application to conventional equipment, and sufficient effects cannot be expected.

Therefore, as shown in Fig. 7, the rolled material 1 is placed between the edger rolls 2.2, and the center line of the rolled material 1 is aligned with the center line 4 of the conveying table 3 (which coincides with the center line of the width reduction mill). It is bitten in a deviated or oblique position. In other words, Fig. 7 shows how the rolled material l progresses from the state of ■ to the state of ■ through ■ and ■ over time. In the state of ■, the tip of the rolled material l that is off center is in contact with the edger roll 2, and in the state of ■, the rolled material 1
receives a force from the outer circumferential surface of the edger roll 2 while remaining undeformed, and is pushed back and tilted in the opposite direction to the deviation at the time of approach. In the state (■), the rolled material I is bitten by the edger roll 2, and the tip of the edge on the opposite side to the direction of center deviation at the time of approach is highly rolled down. Camber whose tip part curves laterally in the direction of misalignment
occurs.

Fig. 8 shows an example of camber generation in a rolled material tb when a rolled material tb of plus decinene is bitten diagonally between edger rolls and width reduction rolling is performed (at the bottom of the figure,
Display the scale as a straight line for reference. Figure 5 shows the same), and the edger roll used is made of gypsum and has a diameter of 80 mm.
mm, and the dimensions of the rolled material are 20+n+n (thickness)XSOm
m (width) x 400n + m (length), width reduction amount is 10m
m, and the initial deviation amount of the center line was set to 15 mm.

As described above, if camber occurs at the tip of the rolled material, there is a problem in that it adversely affects the next process and makes it easier for various troubles to occur.

The present invention was made in view of such conventional problems, and
It is an object of the present invention to provide a width reduction rolling method in which a rolled material is straightly bitten and rolled between an edger and rolls without causing center deviation.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides centering at the rear end of the rolled material using a centering device installed on the entrance side of the edger roll of a width reduction rolling mill. After applying
Alternatively, width reduction rolling was performed while performing centering.

(Example) Next, one embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show a width reduction rolling line to which the width reduction rolling method according to the present invention is applied. 2, and a rolling material trailing end position detector 5. A centering device 6 and a side guide device 7 are provided on the entry side of the width reduction mill.

Of these, the rolled material rear end position detector 5 is equipped with a non-contact or contact type detector, detects the rear end of the rolled material l conveyed on the conveying table 3, and transmits the detection signal to the centering device. 6.

The centering device 6 includes a pair of rollers 8.8 provided so as to move coaxially about a vertical axis and symmetrically with respect to the center line 4 of the conveying table 3. By receiving a detection signal, both rollers 8, 8 are moved in a direction toward each other. Then, both rollers 8, 8 that have started moving move a certain distance and center the rolled material 1 being transported in a relatively movable manner in the direction of the center line of the transport table 3. .

The side guide device 7 is formed with guide plates 9 facing each other at symmetrical positions with respect to the center line 4 of the transfer table 3. Further, both guide plates 9.9 are arranged in a funnel shape, and the distance between the parallel parts is set to a value slightly larger than the width of the rolled material I to suppress the center deviation of the tip of the rolled material 1 within an appropriate range. The expanded portion on the entry side prevents the rolled material 1 from hitting the guide plate 9 when entering.

Next, the width reduction rolling method according to the present invention will be explained by applying it to a Naro width reduction rolling line having the above configuration.

First, when there is no rolled material 1 on the conveying tape 3, the distance between the rollers 8.8 of the centering device 6 is made wider than the width of the rolled material 11.

The rolled material 1 is conveyed on the conveying table 3, and when the rear end of the rolled material 1 is detected by the rolled material rear end position detector 5 (see FIG. 1, light), as shown in FIG. Rolled material 1
While the rolled material 1 is being conveyed, the distance between the rollers of the centering device 6 is narrowed to the width of the rolling material 1, and the rear end portion of the rolled material 1 is centered.

On the other hand, the leading end portion of the rolled material 1 enters and passes through the side guide device 7 smoothly without hitting the guide plate 9 due to the expanded portion of the guide plate 9, and without causing a large center shift due to the parallel portion.

Then, as shown in FIG. 4, the rolled material 1 whose rear end has been centered is fed into an edger roll 2,
Perform width reduction rolling. As a result of centering the rear end of the rolled material 1 in this way, the leading end of the rolled material 1 is centered by the edger roll 2, and there is almost no deviation between the center line of the rolled material 1 and the center line of the rolling mill.

Note that in FIGS. 3 and 4, parts common to those in FIG. 1 are given the same numbers.

FIG. 5 shows the state of the rolled material 1a when a plasticine rolled material is subjected to width reduction rolling similar to that shown in FIG. 8 after centering its rear end. Unlike in the case of , camber does not occur.

In the above embodiment, an example of application to a width reduction rolling line equipped with the side guide device 7 was shown, but the invention may be applied to a conventional width reduction rolling line, and the side guide device 7 may be omitted.

Also, instead of the centering device 11 having the roller 8, as shown in FIG.
Two sea urchins placed opposite each other so that they move symmetrically with respect to
It can also be applied to a width reduction rolling line using a centering device 6a equipped with two guide plates 13. In this case, the centering of the rear end of the rolled material I is performed after the conveyance table 3 is temporarily stopped, and after centering,
Activate the transport table 3 again.

Further, in the above embodiment, the rear end position detector 5 of the rolled material is used, but in addition to this, the present invention also provides a centering device 6.68 in which the operator visually confirms the rear end position of the rolled material.
It may be configured to operate.

In addition, width reduction rolling may be performed while centering the rear end of the rolled material.

(Effects of the Invention) As is clear from the above explanation, according to the present invention, after centering the rear end of the rolled material by the centering device installed on the entry side of the edger roll of the width reduction mill, Alternatively, width reduction rolling may be performed with centering.

For this reason, it is possible to accurately center the rolled material caught in the edger roll without requiring a particularly large force or using large equipment, eliminating camber in the rolled material and eliminating the need for subsequent processes. It is possible to prevent troubles from occurring.

Furthermore, the present invention has advantages such as being easily applicable to conventional width reduction rolling lines.

[Brief explanation of the drawing]

FIG. 1 is a plan layout of a width reduction rolling line to which the method according to the present invention is applied, FIG. 2 is a side view of the roller portion of the centering device in FIG. 1, and FIG. Fig. 1 is a plan layout diagram showing changes in the state of the equipment along with Fig. 1, Fig. 5 is a plan view showing the state of the rolled plasticine material obtained by applying the method according to the present invention, and Fig. 6 is a plan view showing the state of the rolled plasticine material. FIG. 7 is a partially enlarged plan view showing another example of application of the invention; FIG. 7 is a partial plan view showing changes over time in the state of biting of rolled material into the edger roll; FIG. FIG. 3 is a plan view showing the rolling results obtained by applying the method. 1... Rolled material, 2... Edger roll, 6, 6a
...Centering device. Patent Applicant: Kobe Steel, Ltd. Agent: Patent Attorney: Mr. Uegi and two others 114 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] (1) A centering device installed on the entry side of the edger roll of the width reduction rolling mill performs width reduction rolling after or while centering the rear end of the rolled material. Width reduction rolling method.