JPH0698376B2 - Guide for rolling shaped steel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention avoids the deviation of the center of the web, which is inevitably generated during the rolling process, when H-section steel is hot-rolled by a universal rolling mill. It is intended to further improve the dimensional accuracy of products.

(Prior Art) In the rolling of H-section steel, it is common to arrange guides on the inlet side and the outlet side of a universal rolling mill in order to prevent shape defects due to unevenness or warpage of the web that occurs during rolling. There is, for example, Japanese Patent Publication No. 53-3.
Many proposals have already been seen, such as the 4587 publication and the Jitsukai Sho 53-29736 publication. All of these guides have a mechanism of arranging the rolling material in the vicinity of the entrance side and / or the exit side of the rolling mill. However, since the rolling material is not properly guided / guided by the guide, In the region from the end to the roll center of the rolling mill, when the plastic deformation peculiar to hot rolling occurs in the rolled material, the center of the web is unbalanced and rolled.

(Problems to be solved by the invention) By appropriately guiding and guiding the rolling material in the area from the inlet side to the outlet side of the universal rolling mill, avoiding shape deterioration due to plastic deformation peculiar to hot rolling. SUMMARY OF THE INVENTION It is an object of the present invention to propose a new guide which can obtain an H-section steel with good product quality.

(Means for Solving the Problem) The present invention is arranged on a universal rolling mill composed of a pair of horizontal rolls and a pair of vertical rolls, and a rolling material for shaped steel having a web and a flange is provided at the upper part and / or the lower part. For guides that guide / guide along the flange width end face,
The guide has a guide length from the entrance side of the rolling mill to at least a point where the vertical roll starts rolling of the flange, and the guide surface changes the width of the flange when the rolling material is rolling. It is a guide for rolling a shaped steel, which has a corresponding inclination.

In the present invention, in order to further improve the dimensional accuracy of shaped steel products, it is premised that the guide surface has an inclination corresponding to the change in the width expansion of the flange when the rolling material is rolled. Then, from the entrance side of the rolling mill,
It has a guide length at least up to the point of starting the reduction of the web by a horizontal roll, or has a guide length from the entrance side of the rolling mill to at least the roll center of the rolling mill. It is particularly advantageous to have a guide length from the entry side to the exit side of the rolling mill.

1 (a) and 1 (b), the guide according to the present invention has the same structure in all directions, so that one of the guides is attached to a universal rolling mill. Rolls 2 are vertical rolls of the universal rolling mill, 3 is a rolling material, 4 is a guide for guiding and guiding the rolling material 3 to the rolling mill, and this guide 4 is at least vertical from the entrance A ₀ point of the rolling mill. A guide surface 4a having a guide length G ₁ covering the area up to the point A _{1 at} which the roll 2 starts rolling the flange 3b and extending along the flange width end surface 3a of the upper and / or lower part of the blank 3.
In addition, there is an inclination C according to the change in the width expansion of the flange 3b when the material 3 is rolled. In addition, FIG. 2 (a) (b)
4 (a) and (b) show other examples of the guide according to the present invention, among which, FIGS. 2 (a) and (b) are shown.
In the guide 4 configured as shown in FIG. 1 above, the guide length is from the point A ₀ on the inlet side of the rolling mill to at least the point A ₂ at which the rolling of the web 3c by the horizontal roll is started. and G ₂ that covers the area, flange width end faces 3a
The guide surface 4b along the guide 3 has an inclination C according to the change in the width expansion of the flange 3b when the material 3 is rolled down, and FIGS. 3 (a) and 3 (b) show the guide 4 The length is G ₃ that covers the area from the entrance side of the rolling mill to at least the roll center A _{3 of the} rolling mill, and the guide surface 4C along the flange width end face 3a is the width of the flange 3b when the material 3 is rolled. It has a slope C corresponding to the change in the spread, and further, FIGS. 4 (a) and (b) show the guide length of the guide 4 from the entrance side to the exit side of the rolling mill. and G ₄ to cover, in which is assumed to have an inclination C in response to changes in the width spread of the flange guide surface 4d along the flange width end face 3a at the time of reduction of the material 3.

As areas l ₄ of the guide length of the guide in Figure 5 to the outlet side extending from the entry side of the rolling mill, the guide 4 was clearly illustrates an example of arranging along the respective flange width end faces of the rolling elements 3. The guide having the structure as shown in FIG. 5 above is particularly advantageous when rolling H-section steel with high dimensional accuracy, but when deterioration of dimensional accuracy of shaped steel products is tolerated to some extent. May guide and guide only the left and right flange width ends in the upper part of the material 3, or may guide and guide only the lower flange.

(Function) The space for the guide installed in the universal rolling mill is the sixth
As shown in the figure, it is a region surrounded by the horizontal roll 1, the vertical roll 2, the vertical roll chock 5 and the cover plate 6. In the present invention, the guide is installed by utilizing this space. , The maximum width t of the guide
_{At 0} , the minimum width is determined at t ₃ . The state of contact between the rolling material 3 and the rolls of the rolling mill is shown in FIG. 7, and the respective representative cross sections are shown in FIGS. Here, as shown in FIG. 8 (a), the cross-sectional shape of the material at the point A ₁ where the flange portion of the rolled material 3 first comes into contact with the vertical roll has a width B ₁ has an inclination, so the guide 4 Thus, it is in a state where it can be sufficiently restrained in the thickness direction. Also A ₁
From A to A ₂ , in order to eliminate the inclination of the flange or reduce the left and right flange spacing,
As shown in Fig. 8 (b), the flange width expands slightly,
The flange width of material 3 is B2. Then, at the point A ₃ from the point A ₂ to the center of the roll, the flange portion of the raw material 3 is rolled down in the thickness direction, and as shown in FIG. 8 (c), the width is further widened to become B ₃ . By rolling conditions may cause flange width spread from beyond the _3-point A, and eventually will exit the rolling mill with a width of B ₄ (FIG. 1 (a) refer). This invention
As a guide for guiding and guiding the rolling material 3, a guide is appropriately set according to the rolling condition as described above, so that the guiding property of the material 3 is improved and the deviation of the web center can be extremely reduced. . When the guide having the above-described structure is attached to the rolling mill, the width t ₃ of the guide at the point A ₃ is smaller than the flange thickness of the raw material 3. Therefore, if this area is restrained with a strong force, the flange width There is a risk of scratches on the end faces. In the present invention, it is preferable that the restraint force of the guide 4 be maximized in the vicinity of the point A ₁ and that the restraint force be reduced as the roll roll approaches the roll center, and the gap between the guide 4 and the rolling material 3 is widened.

FIG. 9 shows the results of an investigation of the occurrence of web deviation in rolling with and without the guide according to the present invention. It is obvious that it is extremely effective to arrange the guide according to the present invention until the above.

In the present invention, particularly when the G ₄ portion is provided, the interference with the horizontal roll 1 is avoided, and further, the thickness of the flange of the material 3 after rolling can be guided, so that the horizontal roll at the rear end is the closest to the horizontal roll 1. It is desirable to provide a relatively wide flange restraint portion 7 at the position, and a guide roller 8 can be provided at this portion. It should be noted that the present invention is most suitable for rolling H-section steel in which the flange width of the rolling material 3 is constant, but it can be applied even in the case of rolling those having different flange widths. It is also possible to take a structure that can change the vertical spacing as appropriate.
In this case, the dimensional accuracy of the shaped steel product is slightly deteriorated, but there is an advantage that the repair and setting of the guide can be simplified.

(Effect of the invention) Thus, according to the present invention, when the material is guided and introduced into the rolling mill, an unreasonable force is not applied to the flange tip end portion of the rolling material, and the rolling mill from the inlet side to the outlet side Since it is possible to reliably guide and guide in between, the deformation of the flange portion and the deviation of the web center can be minimized.
Moreover, since the guide maintenance load can be controlled by constructing the guide according to the quality of the shaped steel product to be manufactured, the cost required therefor can be advantageously reduced. Further, according to the present invention, the upper and lower positions of the guides are constant, and moreover, the setting position of the guides can be easily adjusted, so that the web height of the rolled material is reduced and the external method becomes constant. This is advantageous when rolling H-section steel with the same flange width.

[Brief description of drawings]

FIGS. 1 (a) and (b) are configuration explanatory views of a guide according to the present invention, FIGS. 2 (a) and (b) are configuration explanatory views of another example of the guide according to the present invention, and FIGS. 3 (a) and (b). ) Is a configuration explanatory view of another example of the guide according to the present invention, FIGS. 4 (a) and (b) are configuration explanatory diagrams of another example of the guide according to the present invention, and FIG. 5 shows an arrangement state of the guide according to the present invention. The figure shown, FIG. 6 is the figure which showed the installation space of a guide, FIG. 7, FIG. 8 (a) (b) (c) is explanatory drawing of the rolling condition of H-section steel, and FIG. 9 is this invention. 2 is a graph evaluating rolling results with and without a guide according to FIG. 1 …… horizontal roll, 2 …… vertical roll 3 …… rolling material, 3a …… flange width end face 3b …… flange, 3c …… web 4 …… guide, 4a-4d …… guide surface 5 …… vertical roll Chock 6 ... Cover plate, 7 ... Restraint section 8 ... Guide roller

Claims (4)

[Claims] 1. A rolling mill for a shaped steel having a web and a flange, which is arranged in a universal rolling mill composed of a pair of horizontal rolls and a pair of vertical rolls, is guided along the upper and / or lower flange width end faces thereof. In the guide to guide, the guide has a guide length from the inlet side of the rolling mill to at least the point where the vertical rolls start the reduction of the flange, and the guide surface of the flange during the reduction of the rolling material. A rolling guide for shaped steel, which has an inclination according to a change in width expansion. 2. The guide according to claim 1, which has a guide length from the entrance side of the rolling mill to at least the point where the horizontal roll starts to reduce the web. 3. The guide according to claim 1, which has a guide length from an entrance side of the rolling mill to at least a roll center of the rolling mill. 4. The guide according to claim 1, which has a guide length from the entrance side to the exit side of the rolling mill.