JPH0221881B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is used to freely create various sizes of sections consisting of flanges and webs, such as H-shapes, I-shapes, and groove shapes, in a rolling process. This relates to a forming rolling mill.

(Prior Art) FIG. 1 shows a universal rolling mill commonly used for rolling H-shaped materials. First, a method for producing H-shaped members of various sizes using this rolling mill will be explained.

The cross-sectional dimensions of the H-shaped member are determined by the flange height l _F , flange thickness t _F , web outer width l _W , web inner width l _W and web thickness t _W . In the universal rolling mill shown in Fig. 1, the flange wall thickness t _F and web wall thickness t _W can be varied over a relatively wide range by changing the roll gap, and the flange height l _F can be varied over a relatively wide range. This can also be changed by increasing the thickness of the raw material, such as billet. However, the inner width of the web is uniquely determined by the horizontal roll body length _W and therefore cannot be changed as long as the same roll is used. Further, the web outer width _lW can only be changed by the amount of change in the wall thickness _tF .

Therefore, in the conventional universal rolling mill, it is impossible to change the web width over a wide range without changing the rolls, and the present invention relates to a technique for compensating for this drawback.

(Objective and Structure of the Invention) In order to compensate for the above-mentioned drawbacks of the universal rolling mill, a forming machine or a rolling mill capable of expanding the web width may be arranged as a downstream process of the universal rolling mill. The present invention relates to such a forming and rolling mill.

The present invention will be explained in detail below.

FIG. 2 is a diagram showing the basic concept of a primitive device for achieving this purpose. The symbol PL in the figure indicates a pass line, and the diagonally shaded rolled materials 1a and 1b move in the direction of the thick arrow ↑ in the direction of the pass line. 2 and 2' are driven or non-driven rolls.

FIG. 3 shows an example of the sectional view taken along the line AA in FIG. 2, and the rotation axes of the rolls 2, 2', 3, and 3' are in the same plane perpendicular to the pass line.

A BB sectional view on the raw material side and a CC sectional view on the finished product side of the rolled materials 1a and 1b are shown in FIGS. 4 and 5, respectively. As can be seen from this figure, only the web 1b of the material is deformed by the present forming machine to expand its width. That is, l′ _W >l _W t′ _W <t _W l′ _F l _F t′ _F t _F. When the roll is not driven or when the width ratio R=
If l' _W /l _W is large, the rolled material will not get caught in the forming rolls 2, 2', but if pushing force is applied, it will get caught. In addition, in order to improve the bottom removal, a pulling device may be placed on the exit side of the molding machine. Such pushing and pulling devices include:
Although it is possible to use a hydraulic cylinder or an electrically driven rack pinion, it is preferable from the viewpoint of productivity to use a method in which the pushing force and the pulling force are generated by the rolling force of rolls.

Such a rolling device may be a vertical roll type or a horizontal roll type, and it is an effective means to use grooved rolls for either of them.

FIG. 6 shows an example of equipment in which vertical roll type pushing devices 4, 4' and vertical roll type pulling devices 5, 5' are used. Further, FIG. 7 shows an example in which hole-shaped horizontal rolls are used as the pushing device 6 and the pulling device 7.

Note that FIGS. 8 and 9 show examples of changing the cross-sectional shape of the H-section steel. In Fig. 8, the roll shape in Fig. 2 is changed so that the diameter decreases toward the tip and the flange is inclined outward, and in Fig. 9, the roll shape is changed to the flange by increasing the diameter toward the tip. The case where the is tilted inward is shown respectively.

The above is a description of a forming machine for expanding only the web width, but next a method for simultaneously deforming the flange will be described.

FIG. 10 and FIG. 11 are diagrams showing the basic concept. The widening of the web is performed by rolls 2a and 2b as in the example shown in FIG. 2, but the thinning and widening of the flange is performed by rolls 8 and 2a and rolls 8' and 2b.

In this case, the number of rolls to be driven is 8,2' rather than 2,2'.
8' seems to be mechanically easier. Further, in the figure, the rolls 2, 2', 8, and 8' are all vertical rolls, but it would be more practical to tilt the entire roll by 90 degrees and make it a horizontal roll. This is the second
The same applies to the examples shown in FIGS.

Next, without changing the rolls, the width ratio R=l′ _W /
l Describe how to change _W. The simplest method is to roll 2,
This is a method of changing the roll opening H of 2'. Besides this, there is also a method of inserting a wedge-shaped spacer between the rolls 2 and 2' as shown in FIG.

Next, a method for manufacturing a tapered H-beam steel whose web width changes continuously in the length direction will be described. In the case of FIG. 12, the roll opening H may be changed during deformation, and in the case of FIG. 13, the spacer 9 may be pushed in the opposite direction to the rolling direction.

By the way, in the above-described molding machine, scratches or seizure defects are likely to occur on the surface of the web. This is because the setting is such that there is no gap in section a in FIG. 3.

To prevent this, the gap h between rolls 2 and 3 and between rolls 2' and 3' should be made slightly larger than the web thickness _tW , and guide rolls etc. should be placed just before and after the forming machine. It is desirable to hold the molded materials 1a and 1b correctly on the pass line.
Although this method is known (Japanese Patent Publication No. 58-57244), it requires very precise operational management. In order to avoid this, the cross-sectional shape of the material to be deformed by the molding machine must be formed in advance into a shape similar to the cross-sectional shape shown in Fig. 14 in the pre-process, that is, the web thickness is thicker in the portion near the flange. Just do it. By doing this, part a, which tends to cause scratches in the direction of the roll circumferential speed, does not come into contact with the web surface, and only part b, where the rolling direction component of the roll peripheral speed is the majority, comes into contact with the web surface. be.

However, this method has a new drawback in that the thickness distribution of the web produced by the forming and rolling machine is not constant.

Next, mechanical structural means for avoiding scratches will be explained. This is the main point of the invention.

FIG. 15 and FIG. 16 show the basic concept of the forming rolling mill according to the present invention.

In the illustrated example, four cantilever rolls 10, 10', 11, and 11' having the same shape are arranged so that their rotational axes are on the same plane perpendicular to the pass line (for ease of explanation, (It is assumed that the web surface of the section steel is the top and bottom surfaces, and the flange surfaces are the left and right sides.), and the flat part perpendicular to the rotation axis, which is the tip of the cantilever roll, is the top and bottom surfaces of the section. The roll should face the web surface, and the roll peripheral surface should face the inner surface of the flange, and the rotation axes of both the upper and lower rolls should be symmetrical with respect to the perpendicular line passing through the pass line center. The cantilever rolls are arranged so as to be inclined to each other, and the vicinity of the joint between the web and the flange is rolled with the corner of the tip of the cantilever roll.

That is, the roll axis P is arranged so that the perpendicular line S forms an angle of θ in the same plane perpendicular to the pass line. 12 and 12' are roll jocks, and 13 is a spacer for adjusting the roll opening. When the roll axis is tilted in this manner, the portion shown in FIG. 16a naturally does not come into contact with the web surface, so no scratches occur. Furthermore, according to this method, it is possible to actively roll the part b near the joint between the web and the flange, so the biting and tailing properties are second to none.
This is better than the cases shown in Figures 3 and 3. In addition, in this inclined roll method, the cross-sectional shape of the material is
It is naturally effective to do as shown in Figure 4, and it becomes possible to obtain a larger rolling reduction ratio.

The angle of inclination does not need to be very large. Generally, a range of 1 to 2° or more and less than 30° is sufficient. If the angle is larger than this, there will be restrictions on the roll diameter and the structure of the housing body will become complicated.

Next, examples of similar forming and rolling mills for channel-shaped materials are shown in FIGS. 17 and 18. In this case, there are two symmetrically inclined rolls, and either one long roll or two flanged rolls are arranged on the lower side.

(Example) An example using a hot mill will be described.

The materials are l _W = 1500mm, l _F = 100mm, t _W = 10mm, t _F
=20mm.

This was rolled using two types: the type shown in Fig. 3, in which the rolls are not inclined, and the type shown in Fig. 16, in which the rolls are inclined. The rolling temperature is 1200℃. The set width ratio R=l′ _W /l _W was varied. The diameter of the roll is 40 mm at its maximum. As expected, with the method that did not tilt the rolls, the scratches were severe, so we rolled with a gap of 3 mm at the top and bottom, as shown in section a in Figure 3, and the surface was good until the width ratio was 1.1. Although a skin and finished product shape were obtained, when the width ratio was increased beyond this, a shape defect as shown by c in FIG. 19 occurred. On the other hand, in the method with an inclination of θ=5°, good surface texture and product shape were obtained up to the expansion ratio R=1.4. In addition, when the width ratio was higher than this, breakage occurred near the joint between the web and the flange.

From the above examples, it can be seen that the method of tilting the rolls shown in FIG. 16 is useful as a forming rolling mill that can change the web width over a large width.

[Brief explanation of drawings]

Fig. 1 is a conventional universal rolling mill for H-shaped materials, and Figs. 2 and 3 are plan explanatory diagrams of a forming rolling mill for expanding the web width used as a post-process of a conventional universal rolling mill, and its A. -A sectional view, Figure 4 is a BB sectional view in Figure 2, Figure 5 is a CC sectional view in Figure 2, Figures 6 and 7 are the front side of the forming and rolling mill in Figure 2. and equipment arrangement with pushing device and pulling device arranged on the rear side, Figures 8 and 9.
The figure is an example of the roll shape of the forming rolling mill shown in Figure 2.
Figures 0 and 11 are plan explanatory views of a forming and rolling mill in which vertical rolls that can hold, shape, and roll the outer surface of the flange are added to the forming and rolling machine of Fig. 2, and a cross-sectional view at the position of the rolls. Figures 12 and 13 show an example of a forming rolling mill with a mechanism that can change the web width between pieces or during rolling. Figures 15 and 16 show examples of material shapes that can prevent scratches that sometimes occur. In order to prevent scratches on the web surface, the left and right rolls are inclined with respect to the perpendicular line passing through the pass line center. Figures 17 and 18 show an outline of a similar widening rolling method for channel-shaped materials. The figure shown in FIG. 19 is a diagram showing an example of defective product shape. 1... Material to be formed (raw material), 2, 3, 10, 11...
Cantilever roll, 4, 6... Pushing device, 5, 7... Pulling device, 8... Vertical roll, P... Roll axis, S... Perpendicular line.

Claims (1)

[Claims] 1. Two or more cantilever rolls having the same shape,
The rotational axes of each roll should be on the same plane perpendicular to the pass line, the tip of the cantilever roll, which is a flat part perpendicular to the rotational axis, should face the web surface of the section, and the peripheral surface of the roll should be on the same plane as the flange. The two cantilever rolls are arranged so as to face the inner surface and are located on the same side with respect to the profile.The rotation axes of the two cantilever rolls are arranged at an angle to each other so that they are symmetrical with respect to the perpendicular line passing through the pass line center. A forming and rolling machine for forming a shape material, characterized in that it is possible to roll the vicinity of the joint between the web and the flange at the corner of the tip of the cantilever roll. 2. The forming and rolling mill according to claim 1, further comprising a vertical roll capable of forming and rolling the outer surface of the flange.