JPH0451242B2 - - Google Patents

Description

[Detailed Description of the Invention] "Object of the Invention" The present invention relates to a method for rolling a steel plate with projections on both sides,
The object of the present invention is to provide a method that can advantageously roll a steel plate having projections on both sides.

Industrial applications Rolling technology for steel plates with protrusions.

BACKGROUND TECHNOLOGY Steel plates with protrusions formed on the plate surface have been used in various ways for bonding with concrete and the like and for reinforcement purposes, but such conventional steel plates with protrusions have protrusions formed on one side.

However, it is not easy in practice to obtain a uniform height of the protrusions on such a steel plate with protrusions.
The present inventors have proposed making the protrusion height uniform and orderly.

Problems to be Solved by the Invention However, in the prior art as described above, since the protrusion is on one side, the bonding and reinforcing effect with concrete etc. as described above is concentrated only on one side.

In order to avoid such disadvantages, the present inventors have considered arranging protrusions on both sides, and have made detailed studies, but it has been found that in a case where protrusions are simply arranged facing each other in the same phase on the front and back sides of the steel plate, The protrusion height that can be obtained under the same rolling conditions is not sufficient. For example, in order to properly form an effective protrusion that exceeds 80% of the caliber height, a considerably high reduction is required, and energy is required. Since the mechanical disadvantage increases at an accelerating rate, the existing rolling capacity is often exceeded.

Also, if the protrusions are shifted to avoid the same phase on the front and back of the steel plate, the resulting protrusion top surface will be inclined,
Unable to get a well-ordered product.

Means for solving the structural problems of the invention When rolling a steel plate in which a plurality of protrusions are arranged in the rolling direction in the width direction of the plate, a caliber for forming the protrusions on the upper and lower sides of the raw steel plate to be rolled is provided. A method for rolling a steel plate with protrusions on both sides, characterized in that work rolls with bulges are disposed opposite each other, and the calibers on the work rolls are positioned such that the other caliber is located approximately in the center of the spacing between the two calibers.

Function A steel plate with protrusions formed on both the upper and lower surfaces can be obtained by rolling the raw steel plate to be rolled under conditions in which work rolls with calibers for forming protrusions are placed on the upper and lower sides of the material steel plate, respectively. By setting the caliber position on the rolled work rolls to approximately the center of the caliber spacing between the opposing rolls, the highest protrusion height can be obtained under the same rolling conditions. Moreover, the metal flow during rolling becomes balanced, and the top surface of the protrusion is also in a state of no inclination.

Embodiment To explain the invention as described above in more detail, in the invention, as shown in FIG. In this case, the position of the protrusion 4 on one side of the steel plate 5 is the same as the protrusion 4 on the other side.
Rolling is performed so as to take a substantially central position between a and 4a.

An example of a roll caliber used for such rolling is shown in Fig. 2 with a roll diameter of 660 mm, but the specific dimensions of a steel plate rolled according to the present invention with such a caliber roll are shown in Fig. 2. As shown in Fig. 3a, when a flat steel plate with a thickness of 15 mm on the entrance side is positioned and rolled down using a caliber roll as shown in Fig. 2 so that the protrusions 4... are located in the center of the opposing protrusions 4a..., The height of the protrusions obtained is compared to that of the protrusions 4..., 4a... taken at the same position facing each other and rolled down as shown in Figure b.
It was confirmed that under the same rolling reduction conditions, it was more than 30% higher. Also, as mentioned above, the protrusions 4..., 4a
Figure 4 summarizes the relationship between the results of examining cases where the However, depending on the position of the protrusions 4 and 4a, the trapezoidal protrusion 4
It was confirmed that the top surface of 4a was inclined. That is, projections 4 and 4 as shown in FIG.
The relationship between the distance S from the projection a, the resulting height h of the protrusions 4 and 4a, and the angle of inclination Δh of the top surface of the protrusions 4 and 4a can be summarized as shown in the diagram in Fig. 4b. If the exact center position with the interval S of 20 mm is taken, the height h of the protrusion is at its maximum, and there is no slope △h of the top surface of the protrusion, but if the interval S deviates from that In any case, the protrusion height h will be small and the top slope △h will also be large,
The direction of inclination of the top surface is lower on the side where the distance between the protrusions 4 and 4a is smaller.

The above is a case where rolling is performed using rolls having the same caliber shape as shown in Fig. 2, but it is obvious that the method according to the present invention can be carried out using rolls having a different caliber shape or size. In the case of rolls having different caliber shapes or sizes, even if the relationship shown in FIG. When the center position is taken, the height of the protrusion obtained is maximum, and the top surface of the protrusion has no slope. Therefore, in the present invention, as shown in FIG. 4b, the central position and a range of approximately 10% before and after the central position are selected and the protrusions 4..., 4a are formed.
... (Therefore, caliber 2) position is taken and rolled.

A specific manufacturing example of the product according to the present invention will be described below.

Manufacturing example 1 As shown in Figure 2, the caliber width is 10 mm, the caliber height is 5 mm, and the caliber rolls of 660 mmφ are placed in rows with caliber 2 having a caliber angle of 60 degrees with a caliber interval of 40 mm. In the No. 4 stand of the hot-rolling finishing tandem rolling mill used for
The rough bar thickness is 35mm and the 1st to 3rd stands are 15mm thick.
The material was rolled to a thickness of 9.0mm and a width of 1475mm.
A steel plate with projections was manufactured.

The product rolled by the method of the present invention with the 4 rows of protrusions and the 4a rows in the center position has a rolling reduction of 6.0 mm, a rolling load of 1800 tons, and the number of protrusions is 37 on the top surface and 38 on the bottom surface. , the obtained protrusion height is the third
As shown in Figure a, both the top and bottom surfaces are 4.65 mm. On the other hand, the comparative example in which the protrusions 4 and 4a face each other has a protrusion height of 3.45 mm as shown in Figure 3b under exactly the same rolling conditions as above, and the one according to the present invention has a protrusion height of 3.45 mm under the same rolling conditions. It is clear that the protrusion height obtained in this process is about 35% higher, and that efficient rolling can be achieved.

As shown in the figure, the top surface of the protrusion in this manufacturing example and the comparative example is not inclined.

Manufacturing Example 2 As shown in FIG. 5, rolling was carried out using upper and lower rolls 1, 1 with calibers 2 having different shapes. That is, the width of the caliber in the upper roll is 8 mm, while the width of the caliber in the lower roll is 10 mm, and otherwise the caliber height is 5 mm and the caliber spacing is 40 mm.

In addition, it is installed in the No. 4 stand of the hot-rolling finishing tandem rolling mill, and the rough bar thickness is 35 mm.
Rolling with a stand, the thickness of the plate at the entrance of the No. 4 stand
A rolling reduction of 6.0 mm is applied to a 15 mm material plate.
The rolling load was 1,700 tons, and the number of protrusions on the upper and lower surfaces was the same as in Production Example 1, 37 on the upper surface.
The bottom surface had 38 stripes.

The obtained steel plate is as shown in Figure 6.
The height of the upper protrusion is 4.90mm, and the height of the lower protrusion is
Although the diameter was 4.50 mm, both had flat top surfaces and could be rolled with high efficiency.

"Effects of the Invention" According to the present invention as explained above, a new steel plate with projections on both sides is provided, and its use is greatly advantageous, and furthermore, it is possible to provide a steel plate with projections on both sides. This invention is an invention that is industrially highly effective because it clarifies the influence of the protrusion height and protrusion shape depending on the protrusion position, and efficiently provides a product with a desirable protrusion shape.

[Brief explanation of the drawing]

The drawings show the technical contents of the present invention, and FIG. 1 is an explanatory diagram showing an overview of the rolling operation according to the present invention, FIG. 2 is an explanatory diagram of the roll caliber, and FIG. FIG. 4 is an explanatory diagram showing the relationship between protrusion height and protrusion shape when using the method of the present invention and when not using the method of the present invention together with the cross section of the steel plate as a graph; FIG. 5 is an explanatory diagram of a roll caliber used in another manufacturing example of the present invention, and FIG. 6 is an explanatory diagram of the cross-sectional structure of a steel plate with protrusions manufactured by the method of the present invention using the roll shown in FIG. . However, in these drawings, 1 is a roll and 2 is a roll.
3 indicates a caliber, 3 indicates a steel plate, and 4 and 4a each indicate a protrusion.

Claims (1)

[Claims] 1. When rolling a steel plate in which a plurality of protrusions are arranged in the rolling direction in the plate width direction, work rolls each having a caliber for forming the protrusions are installed above and below the raw material steel plate to be rolled, and A method for rolling a steel plate with projections on both sides, characterized in that the calibers on the work rolls are rolled so that one caliber is located approximately in the center of the interval between the other calibers.