JPH0579407B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention prevents bending of a rolled material that occurs during rolling of a steel plate into a restraint guide on the entrance and exit sides of a horizontal rolling mill and a roll bite part penetrating restraint guide. The present invention relates to a technology for preventing such damage.

<Prior art> Regarding the mechanism of bending of rolled material that occurs during rolling of steel sheets, see Special Report No. 36 of the Iron and Steel Institute of Japan:
Theory and Practice of Plate Rolling As shown in pages 240-242 (published on September 1, 1982), rolling material is caused by differences in plate thickness and temperature in the width direction of rolled material, and by guiding during rolling. It has been conceptually shown that this can be corrected by constraining the side end faces of.

On the other hand, a typical side guide (hereinafter referred to as a simple guide) is generally as shown in FIG. FIG. 6 shows an example of a rough rolling mill of a hot bending rolling line, in which a vertical rolling roll (edge roll) 2 and a simple guide 5 on the entrance side are arranged on the entrance side of the horizontal rolling roll 1. An exit side simple guide 4 is disposed on the exit side. Here, the entrance side simple guide 5 and the exit side simple guide 4 are both rolled material 6
It is simply a guide device for guiding the rolled material 6 to the center of the horizontal rolling roll 1, and cannot be expected to have the effect of restraining the sides of the rolled material 6 and suppressing bending. This is because the horizontal mill roll 1 and the exit simple guide 4 are separated by several meters, which makes it impossible to effectively restrain the tip and tail ends of the rolled material 6. In addition, due to the distance, the restraining force is applied to the rolled material. This is because buckling occurs on the non-contact side of the rolled material 6 when a load is applied.

Therefore, in order to solve the above problems, the applicant proposed a side guide device (hereinafter referred to as the conventional example) disclosed in Japanese Patent Application Laid-Open No. 63-56314.

<Problems to be solved by the invention> However, for example, the 39th Plastic Working Union Lecture
No.519: As shown in October 24, 1988, it is known that horizontal rolling increases the width of the rolled material.
In addition, published by Japan Iron and Steel Institute, Iron and Steel Vol.67 (1981.10)
As shown in No. 15, P2509, it is also known that vertical rolling causes the thickness of the side edges of the rolled material to become thicker than the other parts (so-called dog bones), and dog bones occur. In rough rolling, the width expansion amount becomes even larger.

Therefore, in the conventional example, if the side guide was set according to the width of the material on the entry side of the roll bite, there was a problem in that the widening of the width caused an accident of material clogging at the exit side restraining guide or the roll bite penetration part. In addition, in order to solve the above problem, it is necessary to set the restraining guide width according to the width of the material on the exit side of the roll bite.In this case, the restraining guide on the entry side becomes wider by the amount of width expansion, so it will bend by that amount. There was a problem with allowing

<Means for Solving the Problems> The present invention has been made in view of the problems of the conventional example, and in order to prevent the steel plate from bending, the present invention has been made in view of the problems of the conventional example. In a side guide device of a rolling mill equipped with entry and exit side restraint guides and a penetration part restraint guide provided through the roll bite part of a horizontal rolling roll, the penetration part restraint guide is inserted into the roll bite part from just before the roll bite part. This is a side guide device for a rolling mill, characterized in that the width is widened immediately after the rolling part due to horizontal rolling.

<Function> The side guide device according to the present invention includes entry and exit side restraint guides provided immediately adjacent to the entry and exit sides of the horizontal roll, and a penetrating part restraint structure that penetrates the roll bit part of the horizontal roll. It is rotatably connected to the side guide, and the width of the penetration part restraint side guide increases from near the roll bite part of the horizontal rolling roll where the rolled material becomes wider, so the output side restraint guide is connected to the horizontal rolling part. The width can be set wider than the entry side restraint guide by the amount of width expansion caused by this.

Therefore, it is possible to prevent even the slight bending of the rolled material seen in the conventional example.

<Example> Specific examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a layout diagram in which a side guide device according to the present invention is applied to a rough rolling mill of a hot rolling line. An entry side restraint guide 7 is arranged on the entry side of the horizontal roll 1, and an exit side restraint guide 8 is arranged on the exit side. A penetrating portion restraining guide 9 is arranged to connect the guide 8.

Further on the entry side of the entry side restrained guide 7, there are vertical rolling rolls 2 and an entry side simple guide 5, and further on the exit side of the exit side restraint guide 8, an exit side simple guide 4 is arranged.

Figure 2 is an enlarged plan view of the main parts of Figure 1.
The configuration of the present invention is shown in more detail. Also the third
The figure is a side view of FIG. 2.

Wo shown in FIG. 2 is the exit width of the rolled material 6, and Wi is the entry width of the rolled material 6. Further, the one-side set opening difference ΔW between the exit side restraint guide 8 and the entrance side restraint guide 7 is set as shown in equation (1).

ΔW≧1/2(wo-wi) ...(1) In the illustrated embodiment, the penetration part restraining guide 9 is not mechanically deformable, so ΔW is a fixed value. If it is at or near that point, the value of 1/2 (wo−wi) is a number.
Since the variation is only mm, it does not particularly impede the effects of the present invention.

The rolled material 6 is horizontally rolled by the roll bit part 10 and expands in width (wo-wi) as shown in the figure. The penetrating portion restraining guide 9 has a sudden opening degree, that is, a widening, in the vicinity of the roll bite portion 10, so that it follows the deformation of the rolled material 6 in the width direction.

Note that, as shown in FIG. 3, it is a matter of course that the side surface of the penetrating portion restraining guide 9 must be made thin along the roll circumference at the roll center line.

In addition, when the thickness of the rolled material differs from pass to pass and the amount of width expansion changes from pass to pass, such as in the first stage of rough rolling or in a reverse rolling mill, the outlet restraining guide 8
The connection between the and the penetration part restraint guide 9 and the connection between the entry side restraint guide 7 and the penetration part restraint guide 9 are made rotatable by, for example, using a pin joint, so that the exit side restraint guide 8 and the entrance side restraint guide are made rotatable. 7 to different widths. That is, as shown in the control block diagram shown in FIG. 4, the input side thickness hi, exit side thickness ho, temperature T, etc. of the rolled material are transmitted from the host computer 13 to the width expansion calculation device 14. ΔW, which is the difference in opening degree on one side between the exit-side restraint guide and the entrance-side restraint guide, is determined by ΔW=f(wi, hi, ho, T...).

From the host computer 13 to the entry side restraint guide control device 1
Let the value transmitted to 6 be wi+α. The reason for this is
A minimum clearance α is required for threading, and α
If is 0, problems will occur during sheet threading, so
This is to prevent this. The exit side restraint guide control device 15 sets the opening degree of the exit side restraint guide 8 to wi+α+2ΔW based on the information from the width expansion calculation device 14 and the information from the host computer 13. By doing this, bending can be prevented without being affected by thickness, rolling reduction, etc.

FIG. 5 shows data comparing the effects of the conventional example and the example. Figure 5 shows the exit thickness of the rolled material ho = 50mm
In order to understand the effect clearly, we intentionally created a plate thickness difference (=1.0) between the work side and drive side of the rolled material.
mm), and an experiment was conducted in which bending occurred.

According to the present invention, the bending that occurs in the conventional example is about 35 mm, but can be reduced to about 10 mm, and the bending of the steel plate can be significantly reduced by the present invention.

<Effects of the Invention> According to the apparatus and method according to the present invention, as described above, the bending of the steel plate that occurs during rolling of the steel plate can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a layout diagram of the apparatus according to the present invention arranged in a hot rolling line, FIG. 2 is an enlarged plan view of the main part of FIG. 1, and FIG. 3 is a side view of FIG. Figure 4 is
A control block diagram according to the method of the present invention, FIG.
A characteristic diagram showing the amount of bending of the steel plate between the example and the conventional example,
FIG. 6 is a plan view illustrating a normal simple side guide. 1...Horizontal rolling roll, 2...Vertical rolling roll, 3...Housing, 4...Output side simple guide,
5... Entrance side simple guide, 6... Rolled material, 7... Entrance side restraint guide, 8... Output side restraint guide, 9... Penetration part restraint guide, 10... Roll bite part, 11
... Ram, 12 ... Cylinder device, 13 ... Upper computer, 14 ... Width expansion calculation device, 15 ...
Output side restraint guide control device, 16... Entrance side constraint guide control device, wo... Output side width of rolled material, wi... Inlet side width of rolled material, ΔW... Output side restraint guide and entry side restraint guide Difference in opening on one side, (wo-wi)...width expansion, ho...thickness on the exit side of the rolled material, hi...thickness on the entry side of the rolled material.

Claims (1)

[Claims of Claims] 1. An inlet/outlet side restraint guide provided immediately adjacent to the inlet/outlet side of the horizontal roll and a penetration part restraint guide provided through the roll bite part of the horizontal roll. A side guide device for a rolling mill, characterized in that the through-part restraining guide is widened from just before the roll bite part to just after the roll bite part to compensate for the width expansion due to horizontal rolling.