JPH0128642B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to horizontal rolls, and more particularly to the production of H-section steel whose web height is always constant even with different flange thicknesses by means of a universal rolling mill. The present invention relates to a variable width horizontal roll suitable for various cases.

Normally, when rolling H-section steel using a universal rolling mill, as shown in Fig. 1, a pair of upper and lower horizontal rolls 1 and a pair of vertical rolls 2 are used, and the rolling process is carried out by adjusting their gap a, a'. , manufactures H-beams in several product sizes with different web thicknesses w and flange thicknesses f. The designation of each dimension of the product shall be as shown in Figure 2.

In this way, a group of product sizes rolled using horizontal rolls and vertical rolls is generally referred to as a "series", and the dimensions of the web width W and flange leg length k are the same among product sizes within one series. It is in rolled form.

As a result, since the web width is constant within the same product series, the web height H will vary greatly, especially between sizes with different flange thickness f, and the flange thickness within the same size Strictly speaking, f also varies, and therefore the web height H varies.

On the other hand, depending on the use of H-section steel, the same web height H is often required for product sizes with different flange thicknesses f within the same product series. It's coming.

It is clear that this requirement cannot be met by the conventional H-section steel manufacturing method described above.

In order to eliminate such shortcomings and meet the demands,
There is a type in which the roll width of the horizontal roll is variable. An example is shown in FIG. This horizontal roll is constructed by fitting two sleeve rolls 3 into an arbor 5 in a slidable manner, inserting a spacer 4 between both sleeve rolls to adjust the distance between them, and fixing each sleeve roll with a fixing jig 8. This horizontal roll width variable roll has a structure in which the spacer 4 is fixed to the arbor 5, but because the number of passes in the finishing universal rolling mill is one and the amount of rolling is very small, spacers 4 and 4 are fixed at each rolling chance. It is used by replacing and fixing.

Therefore, when rolling an H-section steel of a product size with a constant web height between each rolling chance using the horizontal roll width variable roll, it is necessary to reduce the amount of roll modification and the amount of rolls retained. Although this has the advantage of You need to adjust and therefore take the role offline and
Moreover, there was a drawback that it required time and effort to adjust or replace the device.

Therefore, the inventors of the present invention have conducted intensive research on a horizontal roll that completely eliminates the drawbacks of the above-mentioned conventional technology and can change the roll width online and by remote control, and based on a novel idea. The present invention was completed in 2013, and its gist is that it comprises a pair of left and right sleeve rolls that control the rolling of the material to be rolled, and an arbor that fixes and holds these sleeve rolls, and that A hydraulic cylinder is disposed to move at least one of the sleeve rolls in the roll axis direction, and an injection groove is provided on the outer periphery of the arbor to form an oil film on the mating surface with the sleeve roll. It is a horizontal roll with variable width.

Hereinafter, the present invention will be explained in detail based on examples.

Figure 4 schematically shows an example of a horizontal roll in which a pair of left and right sleeve rolls, which control the rolling of the material to be rolled, are slidably fixed to an arbor, and a hydraulic cylinder is provided between each sleeve roll. to show.

First, the horizontal roll main body is connected to the arbor 5 by a conventional method, and a pair of left and right sleeve rolls 8, 8' which control the rolling of the material to be rolled, which are tightly fitted, are fitted into the arbor 5.
It consists of Sleeve rolls 8, 8' and arbor 5
By providing an interference fit between the sleeve rolls 3 and 3', movement of the sleeve rolls 3, 3' in the axial direction of the moving rolls due to rolling reaction force can be prevented.

In order to change the roll width W _R of the sleeve rolls 3, 3', in this embodiment, an injection groove 6 for oil supply is provided in the arbor 5, as shown in FIG. This groove 6 opens outward on the surface of the arbor 5 at the fitting part with the sleeve rolls 3 and 3' which should be able to slide in the roll axis direction, and also allows hydraulic pressure to be supplied from the outside. It communicates with an oil supply path provided inside the arbor 5.
The oil supply path is connected to a hydraulic device 8 via an oil pipe A arranged outside the roll.

In such a configuration, the sleeve roll 3,
3', that is, when moving it in the direction of the roll axis to change the roll width W _R , apply hydraulic pressure to the oil supply injection groove 6 through the oil pipe A, and move the arbor 5 and the sleeve. An oil film is formed on the mating surfaces of the rolls 3 and 3', that is, on the metal contact parts, and the coefficient of friction (μ) is
is reduced to 1/10 to 1/100, thereby making the sleeve rolls 3, 3' slidable.

In this embodiment, as shown in FIG. 4, hydraulic cylinders 7, 7' are provided between the pair of sleeve rolls 3, 3' as external force applying means for sliding the sleeve rolls 3, 3'. ing.
This hydraulic cylinder is operated by oil pressure applied from outside the roll via an oil pipe B by a hydraulic device 9 via an oil supply path provided inside the arbor 5. By the hydraulic cylinders 7, 7',
Each sleeve roll 3, 3' can be pressed outward in the axial direction of the roll.

That is, by adjusting the interval between the sleeve rolls 3 and 3',
When changing the roll width, use the hydraulic cylinders 7, 7' to apply an external force in the opening direction (axially outward), and use the hydraulic cylinders 7, 7' to apply the external force in the closing direction (axially inward). This is done by tightening the vertical rolls 2, 2' with their reduction screws (not shown) and pressing the horizontal roll sides S, S'. Of course, during such adjustment, it is necessary to keep the sleeve rolls 3, 3' in a slidable state as described above.

Next, the operation of changing the horizontal roll width in the above-mentioned example of the horizontal roll device will be explained using FIG. 4.

First, in order to make the sleeve rolls 3, 3' slidable, a predetermined hydraulic pressure is supplied by the hydraulic device 8. Note that 10 is a control device that controls the hydraulic pressure of the hydraulic devices 8 and 9 and the timing of the hydraulic load.

Next, set the vertical roll left and right gap so that it is equal to the target horizontal roll width W _R. However, there are still horizontal roll sides S, S' and vertical roll 2,
2' are not in contact with each other, the hydraulic system 9 supplies hydraulic pressure to the hydraulic cylinders 7 and 7' for expanding the roll width until they come into contact with each other, and the contact pressure on the vertical rolls is detected and controlled. The device 10 stops the hydraulic pressure supply by the hydraulic device 9.

The roll width W _R at this time is measured by the roll width detector 11,
11', and fine adjustment is made using the vertical roll left and right gap and the hydraulic cylinders 7, 7' to set the predetermined roll width W _R. Next, the control device 10 instructs the sleeve sliding hydraulic device 8 to release the hydraulic pressure. In this way, the horizontal roll width is set to the target roll width W _R , and the roll is ready for rolling.
When setting the horizontal roll width, a hydraulic cylinder that presses the sleeve rolls 3, 3' inward from the outside in the axial direction may be used instead of the vertical roll.

Thereafter, the vertical rolls 2, 2' are set at positions where a constant web height can be maintained with rolling reaction force applied. In this way, regardless of the horizontal roll width, that is, the web height of the rolled material, the target flange thickness can be set independently of the web height, and the H-beam steel can always have a constant web height. It becomes possible to carry out rolling.

In the above embodiment, both sleeve rolls 3, 3' are made slidable and hydraulic pressure is used, but it is possible to make only one sleeve roll slidable, or use a fluid other than hydraulic pressure. It goes without saying that various embodiments are also possible, such as using pressure.

As is clear from the above description, according to the present invention, the drawbacks of the prior art described above can be completely eliminated and the roll width can be changed freely and quickly online and by remote control. can.
In addition, it is possible to effectively deal with changes in the web height of the material to be rolled (inlet material), changes in the plastic properties of the material to be rolled, etc., and furthermore, even after modification of the side surface of the sleeve roll. It is also possible to easily adjust the width of the roll before scraping. Therefore, within the same product series, H-beam steel of various sizes can be produced with high height, such as meeting the demand for manufacturing H-beam steel with the same web height for product sizes with different flange thicknesses. Can be manufactured with dimensional accuracy.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram showing the rolling state of H-section steel by a universal rolling mill, Fig. 2 is a diagram explaining the product name of H-section steel, and Fig. 3 is a schematic diagram of a horizontal roll width variable device according to the prior art. FIG. 4 is a schematic explanatory diagram of a universal rolling mill equipped with a horizontal roll width variable device according to an embodiment of the present invention. 1...Horizontal roll, 2,2'...Vertical roll,
3, 3'...Sleeve roll, 4...Spacer,
5...Arbor, 6...Injection groove for oil supply, 7,7'...Hydraulic cylinder, 8,9
...Hydraulic device, 10...Hydraulic control device, 11,1
1'...Roll width detector, A, B...Hydraulic piping.

Claims (1)

[Scope of Claims] 1. A device comprising a pair of left and right sleeve rolls that control the rolling of the material to be rolled, and an arbor that fixes and holds these sleeve rolls, and at least one of the sleeve rolls is placed between the rolls of the sleeve rolls with respect to the roll axis. A variable-width horizontal roll that is equipped with a hydraulic cylinder that moves the roll in this direction, and has an in-jet extension groove on the outer periphery of the arbor that forms an oil film on the mating surface with the sleeve roll.