JPS63242402A - Buckling prevention device for hot slab width reduction press - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a buckling prevention device for a width reduction press for hot slabs, and particularly to a buckling prevention device that can accommodate various combinations of slab widths and width reduction amounts. Regarding equipment.

[Prior art] When a vertical roll mill and a horizontal roll mill are used to roll a hot slab to change its width, the conventional rolling mill has a problem in that buckling occurs during rolling due to the vertical roll mill. .

For this reason, the width reduction was performed so that the maximum value of the width reduction amount was 172 or less of the initial slab thickness.

In order to solve this problem, as a technique for positively holding the slab, as disclosed in Japanese Patent Application Laid-Open No. 57-168707, a set of rollers is placed at the center in the axial direction of the slab on the axis connecting the vertical rolls of the edger. means for providing a presser roller;
Or, as disclosed in "Iron and Steel" Autumn 1983 Lecture Collection 69-5 (1983) 8350.349 published by the Iron and Steel Institute of Japan, a means of providing two sets of presser rollers sandwiching the center of the slab in the width direction, etc. It has been known. According to these means, the above-mentioned width reduction amount can be reduced to 1/2 of the initial slab thickness.
You can do more than that.

On the other hand, in the width reduction press, as shown in Fig. 3, if a slab with dimensions of 220 mm thick x 1600 mm wide is reduced in width by a maximum of 350 mm at one time, buckling occurs, and buckling occurs in the conventional technique. Some preventive measures were not able to fully demonstrate their function. In order to solve this problem, a proposal disclosed in Japanese Unexamined Patent Publication No. 85-8845 is known. This proposal is aimed at reducing the buckling of the slab that occurs during width reduction at two or more locations in the front and back of the slab conveyance direction, sandwiching the junction between the parallel part of the anvil and the entrance side slope part in the widthwise central part of the hot slab. The device is pressed by a pressing device to prevent this.

[Problem that the invention seeks to solve]

However, as proposed in Japanese Patent Application Laid-Open No. 85-8845, even if the slab is pressed with rollers or the like at two or more positions, there is a problem in that a sufficient buckling prevention function cannot be achieved. The reason for this is explained in Figures 4, 5 and 6.
Referring to the figure, the buckling prevention rollers are la, lb, 2a,
A case will be described in which three pairs of upper and lower pairs of 2bt 3a and 3b are provided. The thickness of slab 4 is 220++v, wide slab (111100 to 2000+am), medium width slab (1200 to 1600i+n), narrow width slab (70mm)
0 to 1000+++m) and the same amount of 300a+m
It is assumed that the height position of the lower buckling prevention is adjusted to the middle width slab as shown in FIG. 6(a), and that good buckling prevention is achieved. That is, as shown in FIG. 4, the upper surface of the lower roller 1b in front of the deformation area during width reduction is
The level of the top surface of the second bottom roller 2b is the same as the top surface of the slab conveyance table roller on the input side, and the level of the top surface of the second bottom roller 2b is lower by the increase in thickness at the center of the slab due to width reduction, and the top surface of the third bottom roller 3b is lower. The level is set lower by the increase in thickness at the center of the slab after completion of one-width reduction.

With such a configuration, the buckling prevention function of the medium-width slab can be sufficiently performed.

Next, let us consider the case where width reduction of a wide slab is carried out at this level. According to the test results, the width reduction characteristic of a wide slab is that there is almost no increase in thickness in the width direction at the central part, and therefore, as shown in FIG. A gap will be created between them. - Since the sumo wrestler rollers 2a and 3a press from above, it rather tends to buckle, and does not exhibit a good buckling prevention function.

Let us also consider the case where width reduction of a narrow slab is performed while the upper surfaces of the lower rollers lb, 2b, 3b remain at the same level as described above. According to the width reduction test results of narrow width slabs, the deformation penetrates to the center and the thickening distribution in the width direction becomes quite large even in the center, so that the lower surface of the slab is lowered by the lower roller 2b as shown in Fig. 6 (Q). , 3b becomes wedged. Moreover, since it receives loads from both sides, it tends to buckle downward, and in this case, it does not exhibit a good buckling prevention function.

Furthermore, if the width reduction amount is small even in medium-width slabs, deformation tends to concentrate near the slab width ends, and in this case also, the sixth
As shown in Figure (a), if the positions of the upper surfaces of the lower rollers 2b and 3b are adjusted to the case where the width reduction amount is large, a gap will be generated between the lower surface of the slab and the lower rollers 2b and 3b, and the upper roller 2a
, 3a has also been found to cause a tendency to buckle.

In other words, according to the above-mentioned conventional technology, buckling prevention means based on the deformation of the slab cross-sectional shape due to the slab width and the amount of width reduction are not considered, and buckling is not sufficiently prevented in various combinations of the slab width and the amount of width reduction. The problem was that it could not be prevented.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a buckling prevention device for a width reduction press for hot slabs that can accommodate various combinations of slab widths and width reduction amounts.

[Means for solving problems]

In order to achieve the above object, the present invention uses a pair of anvils having a parallel part along the conveyance direction of the hot slab and an inclined part at least on the entry side, and is applied to the hot slab in the width direction. In order to prevent buckling in the width direction that occurs when rolling is applied, the front and back of the slab conveyance direction sandwiching the junction between the parallel part of the anvil and the entrance side inclined part at the center part in the width direction of the hot slab. In a buckling prevention device for a width reduction press for a hot slab, which comprises a pair of upper and lower pressing means for preventing buckling at at least two positions, the height of the lower pressing means between the pressing means Means is provided for adjusting the position according to the width of the hot slab and the amount of width reduction.

[Effect]

According to the above configuration, the height of the lower pressing means of the plurality of pairs of pressing means arranged along the slab conveyance direction can be adjusted according to the width of the hot slab and the amount of width reduction. It is possible to prevent a gap from being generated between the lower surface of the slab and the lower pressing means to bite into the lower surface of the slab, and it is possible to exhibit a good buckling prevention function.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the buckling prevention device for a width reduction press for hot slabs according to the present invention will be described with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 and 2. FIG.

In this figure, parts that are the same or equivalent to those of the conventional example shown in FIGS. 3 and 4 are designated by the same reference numerals.

At the top and bottom of the hot slab 4, there are buckling prevention function rollers la, lbt 2a, 2bv 3a, which serve as pressing means.

3b are arranged facing each other. The positions of these rollers relative to the anvil 5 are the same as in the conventional example shown in FIG. Upper roller la, 2a.

3a are each slidably mounted on the upper frame 6, and each independently presses the hot slab 4 between the lower rollers lb, 2b, 3b by a hydraulic cylinder 7.8°9. It has become. On the other hand, lower rollers lb, 2b,
3b are rotatably supported by the lower frame 10, and one end of the lower frame 10 on the material entry side is connected to a pin 11.
It is rotatably supported by the fixed side bracket 12 via.

Lower rollers lb, 2b, and 3b each have a lower bearing of 13°14
．． The lower bearings 13 and 14 are rotatably supported by the lower frame 10 via 15, and liner shims 16° are provided between the lower surfaces of the lower bearings 13 and 15 and the lower frame 10 so that the height can be adjusted individually. 17.18 is installed. One end of the lower frame 1o opposite to the one end where the pin 11 is provided is supported by a worm jack 19 fixed to the main body of the device, and this worm jack 19 is rotationally driven by a motor or the like (not shown) via an extension shaft 20. and is height adjustable.

Next, the operation of this embodiment will be explained. Lower roller 1 on the material entry side
Since the cross-sectional shape of the hot slab 4 is the same as that of the material slab regardless of the amount of width reduction, the height of a can be set at the same height as the top surface of the input conveyance table roller. The height of the lower roller 3b may be the same as the height of the lower roller 1b on the entrance side in the case of a wide slab, but in the case of a narrow width slab it should be adjusted lower than the height of the lower roller 1b, and in the case of a medium width slab Adjust to the height of the intermediate value. Regarding the specific values of these heights, a practical method is to find a mathematical model through a model test, and then correct these mathematical models during actual width reduction. Further, even if the height of the intermediate lower roller 2b is adjusted as being proportional to the distance from the lower roller 1b on the input side and the lower roller 3b on the output side, there is no large error.

According to this embodiment, the hot slab 4 to be pressed for width reduction next
By knowing the width and the amount of width reduction, the heights of the lower rolls 2b and 2c can be adjusted and set according to these values, making it possible to realize various width reduction presses without causing buckling. This facilitates process control within the rolling line and improves product yield.

In the above-described embodiment, a case has been described in which there are three sets of buckling prevention rollers, but the number of these rollers is not limited to three sets. In addition, in this embodiment, the lower rollers lb, 2b
, 3b is rotated to adjust the overall height.
6, 17° and 18°, the lower rollers lb, 2b, and 3b may each be provided with separate height adjusting means.

〔Effect of the invention〕

As described above, according to the present invention, the height of the lower roller of the pair of rollers, which is the pressing means for preventing buckling provided in the width reduction press for hot slabs, is adjusted to the slab width and width reduction amount. Since it can be adjusted accordingly, it is possible to sufficiently exhibit the buckling prevention function in response to various combinations of slab width and width reduction amount.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the buckling prevention device for the width reduction press for hot slabs according to the present invention, Fig. 2 is a plan view of Fig. 1, and Fig. 3 shows the operation of the width reduction press for hot slabs. Plan view shown, 4th
The figure is a front view showing a conventional buckling prevention device, FIG. 5 is a plan view of FIG. 4, and FIG. 6 is a front view showing the operation of the conventional buckling prevention device. 1 a, 2 a, 3 a-upper roller, lb, 2
b, 3b...lower roller, 4...slab, 5...anvil, 10...lower frame, 19...worm jack, 16,17°□811. Raina, A.
”'□-Proxy agent Patent attorney Katsuo Ogawa-'- Tea (Condolences Z

Claims (1)

[Claims] 1. Rolling down the hot slab in the width direction using a pair of anvils each having a parallel part along the conveyance direction of the hot slab and at least an inclined part on the entry side thereof. In order to prevent buckling in the width direction that occurs when the hot slab is heated, at least two locations in the front and back in the slab conveyance direction sandwiching the junction between the parallel part of the anvil and the entrance slope part at the center part in the width direction of the hot slab. In a buckling prevention device for a width reduction press for a hot slab, which is provided with a pair of upper and lower pressing means for preventing buckling at a position, the height position of the lower pressing means among the pressing means is 1. A buckling prevention device for a width reduction press for a hot slab, characterized in that it is provided with means for adjusting according to the width of the intermediate slab and the amount of width reduction. 2. The means for adjusting the height position of the lower pressing means is a member that rotatably supports one end of the frame supporting the lower pressing means on the buckling prevention device main body, and supports the other end so as to be vertically movable. Claim 1 characterized in that
A buckling prevention device for a width reduction press for hot slabs as described in 2. 3. Claim 1 or 2, characterized in that the lower pressing means is supported within a frame that supports the lower pressing means via members for individually adjusting the height position. Buckling prevention device for width reduction press for hot slab as described.