JPS6040931B2 - Pass line adjustment device in universal rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for adjusting a bus line in a universal rolling mill, and more particularly to a device for improving the center deviation of a web that occurs during the production of H-beam steel by appropriately adjusting the bus line.

In general, when H-beam steel is manufactured using a universal rolling mill, it is particularly important to keep in mind that the deviation of the center of the web must be minimized by appropriately adjusting the bus line.

When manufacturing an H-shaped steel using a normal universal rolling mill, consider the case where a material to be rolled is rolled through three passes a, b, and c, as shown in FIG. 1, for example.

In these rolling passes a, b, and c, the HE dimension must be reduced while maintaining a constant value due to the reduction in the edging mill. Therefore, H in a above
The length A from the lower end of the flange of the shaped steel to the center of the web is A
= HE 11/masu. In this case, the rolled material of this size is b
When rolled to c, the same length B at c
So, B = HB 11/desk 2, and A-B = 1/2 (chi.

As shown by -t, 2)=1/2Δt, the center of the web of the H-shaped steel moves down at a rate of 1/2Δt. On the other hand, the horizontal roll bus line of a universal rolling mill must always maintain a constant position due to the vertical rolls, so unless the table height changes with each pass,
This aggravates the deviation of the web center, which has been misaligned at the rate of 1/2Δt between the web center of the material to be rolled and the bus line of the horizontal roll, as described above.

Additionally, please refer to FIGS. 2 and 3.

First, in the normal universal rolling mill shown in Figure 2,
Assuming the radius RW of the horizontal roll 1, the radius RV of the vertical roll 2, the flange reduction amount △hf by the vertical roll 2, and the web reduction amount △hw by the horizontal roll, 2RV>NORW, △
hr>△hW, and under these conditions, the contact length lv, IW between the rolled material 3 and the rolls 1 and 2 becomes ]V>IW, as is clear from the calculation.

Therefore, when the center of the vertical roll 2 and the center of the horizontal roll 1 are on the same plane, as shown in FIG. It will be located forward of the biting position B, and the rolled material 3 will be bitten from the flange surface 4 first.

In such a state, the weave 5 in the rolled material 3
If the center of the horizontal roll 1 in the universal rolling mill is misaligned with the bath risot of the horizontal roll 1, as shown in FIG. The vertical movement is restrained by the frictional force between the side wall of the vertical roll 2 and the circumferential surface of the vertical roll 2, and the web 5 that is caught from behind is pushed up by the horizontal roll 1 as shown in FIG. As a result, the rolled material 3 is in a state where the center of the web 5 is shifted as shown on the right side of the figure.

In other words, in the H-shaped steel on the left side of the same figure, when 1=L is rolled and becomes the H-shaped steel on the right side, 1> etc., and the web 5
This results in a bias towards the center. In order to prevent such deviation of the center of the web, it is sufficient to precisely align the center of the weave 5 of the material to be rolled 3 with the bus line of the horizontal roll 1 in the universal rolling mill.

Based on this view, as shown in FIG. 4, one end of a roller table 6 for feeding the material 3 to be rolled into the universal rolling mill is rotatably supported by a pin 7, and the roller table 6 is rotatably supported by a pin 7. Conventionally, the end of the table 6 closer to the rolling mill can be raised and lowered using a hydraulic cylinder 8, etc., and the end of the table 6 closer to the rolling mill is adjusted up and down so that the center of the web 5 coincides with the bus line of the horizontal roll 1. It was considered in However, when adjusting the bus line by raising and lowering the roller table 6 on one side, the table 6
will be tilted.

As shown in FIG. 4, when the material 3 to be rolled is fed into the horizontal roll 1, the distance from the tip of the material 3 to be rolled is about 3 to 4, because the material 3 is fed upward as a result of the above-mentioned roll. Regulations 1 and 2 are performed relatively appropriately, and the center of the web 5 is in a good state. The rear end of the material 3 is lifted and separated from the table 6, and the material 3 to be rolled is
are fed into the rolling mill in a parallel state. The rolled material fed into the rolling mill in such a parallel state is not properly regulated by rolls 1 and 2, that is, it is rolled in the same state as shown in Figure 3, and as a result, this In the rear part, as shown at the right end of FIG. 4, the center of the web 5 is in a bad state (1>L).
Therefore, according to such a conventional bus line adjustment method, the deviation of the center of the web 5 in the front part and the rear part of the rolled material 3 will be different, and a product of appropriate dimensions will not be obtained.

From the above-mentioned viewpoint, the present invention provides a method for feeding a material to be rolled into a rolling mill so that the center of the web of the material to be rolled always accurately matches the bus line of the horizontal rolls in the universal rolling mill. The roller working table is configured with a horizontal part that can be raised and lowered while always keeping it in a horizontal state, and by optimizing the feeding action of the rolled material to the universal rolling mill, the deviation of the center of the web is significantly reduced. It is characterized by this. Next, the present invention will be explained by way of an example with reference to FIG. 5.

FIG. 5 is an overall side view of the working table according to the present invention, and the table is composed of a primary table 11 and a secondary table 12.

In the case of this embodiment, the length of the material to be rolled is approximately 10 m, and the length of the secondary table 12 is also approximately 10 m, so that the material to be rolled that is sent to the universal rolling mill 13 is It has been relisted. Further, one end 14 of the primary table 11 is rotatably fixed by a pin 15 on the foundation, and its tip 16 is supported on a support stand 17 provided at one end of the secondary table 12. .

On the other hand, the secondary table 12 is provided with lifting devices 18 on both ends thereof, that is, on the support base 17 and the lower surface of the end on the rolling mill 13 side, so that the entire table 12 can be raised and lowered while maintaining a horizontal state. It is now possible to do so. Although various structural types of elevating devices 18 are conceivable, it is preferable that one elevating device 18 be disposed on each side of the table 12.

For this reason, in this embodiment, as shown in FIG. 6, worm wheel mechanisms 24 and 25 are provided on the lower surface of both ends of the table 12, and each ratchet holder 21 is driven by a drive source such as a motor with a speed reducer (not shown). Pivoted worm 2
The table 12 is raised and lowered by rotating the drive shaft 23 with a four-wheel drive shaft and raising and lowering the screw 22 that is threaded into the wheel 25 via the worm wheel 25 that meshes with the worm 24.

Note that 201 is a warm wheel box. The bus line adjustment device according to the present invention has the above-described structure, and when the material to be rolled is fed into the universal rolling mill 13 during rolling, the center of the web is adjusted according to the flange of the material to be rolled. In order to accurately match the bus line of the horizontal rolls in the rolling mill 13, the secondary table 12 may be adjusted by moving up and down while maintaining the horizontal state using the lifting device 18 at both ends thereof.

The vertical movement of the table 12 can be automatically controlled in conjunction with the height position of the horizontal roll. Such a working table that can be raised and lowered in a horizontal state for adjusting the bus line may be provided for each pass of the rolling operation by the universal rolling mill, that is, the working table provided between each pass may be , the height may be changed depending on the amount of rolling, while maintaining the horizontal state, so that the material to be rolled is fed into the rolling mill in a horizontal state.

Next, as shown in Fig. 7, an appropriate number of H-shaped steels (indicated as N in Fig. 7) are made for the three types of H-shaped steel shapes.
The center deviation S of the shaped steel was measured when the shaped steel was rolled with and without the present invention (shown as the secondary method).

Note that the center deviation amount S was calculated based on S = three-tripod candle.

The measurement results are shown as a histogram in Figure 7.
As shown in the figure, it is clear that when the present invention is applied, the deviation in the center becomes much smaller than in the conventional method.

As described above, according to the present invention, a roller working table having a horizontal portion that can be raised and lowered while maintaining a horizontal state is provided at the front of the universal rolling mill and/or between each pass, and this horizontal portion is used for rolling. The material to be rolled is sent to the rolling mill while maintaining itself in a completely horizontal state in order to raise and lower the material appropriately while maintaining the horizontal state at a height where the web center of the material precisely matches the bus line of a given rolling mill. This allows the center deviation of the web to be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the cross section of the rolled material between each pass, Fig. 2 is a front view showing the form of rolling rolls in rolling of H-shaped steel, and Fig. 3 shows the form of rolling next to each other in rolling of H-shaped steel. FIG. 4 is a side view showing the manner in which the rolls are engaged in the rolling of a conventional Japanese steel sheet whose one end can be driven up and down, FIG. 5 is a side view showing the entire tilting table of the present invention, and FIG. Fig. 5 is a vertical cross-sectional view taken along the line A-A, Fig. 7 is a histogram comparing the deviation of the center of the H-shaped steel when the present invention and the conventional method are applied, and Fig. 8 is a diagram for calculating the deviation of the center of the H-shaped steel. FIG. 2 is a side view of the H-shaped steel shown in FIG.
In the figure, 1... horizontal roll, 2... vertical roll, 3... rolled material, 4... flange, 5... web, 11... ...Primary side taple, 12...Secondary side tablel, 13...Universal rolling mill, 15...Support pin, 18.
··…lift device. Figure 1 Figure 7 Figure 2 Figure 3 Figure 4 Figure 6 Figure 8 Figure 5

Claims (1)

[Claims] 1. A roller working table for feeding material to be rolled into a universal rolling mill that rolls H-shaped steel using horizontal rolls and vertical rolls is divided into a continuous primary side table and a secondary side table. The next table has a structure equipped with a lifting device for raising and lowering it while maintaining a horizontal state, and the primary table has a structure that tilts as the secondary table moves up and down. A pass line adjustment device for a universal rolling mill featuring: