JP2001212602A - Striped plate and method of manufacturing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a striped plate having a projecting rib which has a good shape and which is high enough, securing plastic flow for materials when the projecting rib is formed, by raising an area percentage in thick portions wherein the projecting rib is formed. SOLUTION: The striped plate has a plurality projecting ribs formed on the surface of a plate. When a rib length of the projecting rib is L, a rib width is W and an interval adjoining each projecting rib is D, the area percentage SR of a rib forming portion calculated as SR=50πLW/D2 is 20% or more and the relationship of L+W<root2×D is established.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a striped plate in which one side is provided with a striped pattern due to irregularities by rolling using a hole-shaped work roll, and a method of manufacturing the same.

[0002]

2. Description of the Related Art A striped plate is manufactured by rolling a material stepwise on a plurality of rolling stands and transferring the surface shape of a hole-shaped work roll incorporated in a final stand.
For example, in a configuration in which seven rolling stands are arranged (FIG. 1), the material S is sequentially reduced in thickness in the first to sixth stands 1 to 6 while the material S is fed in the rolling direction R, and the holes incorporated in the final stand 7 are formed. The material S is pressed down by the mold work roll 8. Concave portions d ₁ and d ₂ (FIG. 2) are formed on the peripheral surface of the grooved work roll 8, and when the material S passes through the grooved work roll 8, the concave portions d ₁ and d _{2 form} the surface of the material S. Is transferred to the concave portions d ₁ and d ₂
Plate P with convex ribs p ₁ and p ₂ corresponding to
(FIG. 3).

[0003]

When the striped plate P is manufactured by rolling using the hole-shaped work roll 8, an important quality factor is a rib height, which is generally a convex having a height of 1.2 mm or more. A striped plate P provided with ribs p ₁ and p ₂ is required. In order to form the high convex ribs p ₁ and p ₂ , it is conceivable to deepen the concave portions d ₁ and d ₂ formed in the grooved work roll 8. However, even when the concave portions d ₁ and d ₂ are deepened, the tension of the convex ribs p ₁ and p ₂ (thick portion) having a small rolling reduction becomes relatively large, and the convex ribs p ₁ and p ₂ are increased by the tension. In many cases, the projecting ribs p ₁ and p ₂ having the target height are not formed because they are stretched.

[0004] protruding rib p _1, p ₂ of rib width Factors that affect the height, but the rolling conditions such as ribs or reduction ratio, such as a rib spacing are exemplified, convex ribs p _1, p ₂ Since the effect on the height of the ribs has not been clarified, a large draft was set to secure the required rib height. However, since a large rolling reduction causes an increase in rolling load, a required rib height cannot be obtained in many cases due to restrictions due to the performance of the rolling mill. In this regard, there is a method of manufacturing a striped plate with a convex rib having a required height within the constraints of the rolling mill by optimizing the rib shape by clarifying the influence of the rib shape on the rib height. Is desired.

[0005]

SUMMARY OF THE INVENTION The present invention has been devised to meet such a demand, and has been proposed by increasing the area ratio of a thick portion on which a convex rib is formed. An object of the present invention is to provide a striped plate provided with a convex rib having a good shape and a sufficient height, while ensuring plastic flow of a material during formation. In order to achieve the object, the striped plate of the present invention is a striped plate in which a plurality of convex ribs are formed on a plate surface, and the rib lengths of the convex ribs are L, the rib width is W, and adjacent ribs are adjacent to each other. When the interval between the convex ribs is D, SR = 50πLW
The area ratio SR of the rib forming portion calculated as / D ² is 2
0% or more, and a relationship of L + W <√2 × D is established.

When a strip is provided with a plurality of convex ribs by rolling a material with a rolling mill incorporating a grooved work roll, the rib length L, rib width W, and rib interval D of the convex ribs are adjusted. A plurality of concave portions are formed on the peripheral surface of the roll with a corresponding length L ′, width W ′, and rib interval D ′, and SR ′ = 50πL′W ′
/ D' ² calculated as area ratio SR 'of the concave portion is 20
% Or more, the convex ribs are formed on the surface of the material using a hole-type work roll satisfying the relationship of L ′ + W ′ <√2 × D ′. Stripes with convex ribs are produced.

[0007]

In order to form the high convex ribs p ₁ and p ₂ , the plastic flow of the material S fed into the concave portions d ₁ and d ₂ of the hole-shaped work roll 8 during rolling is promoted, and the concave portions d ₁ and p ₂ are promoted. it is necessary to increase the fullness of material in d _2. Increasing the rolling reduction increases the degree of filling of the material. However, a large rolling reduction increases the rolling load, so there is a restriction due to the rolling mill's performance, and it cannot be applied to a rolling mill with low performance. Therefore, the present inventors have made a method of increasing the convex ribs p ₁ and p ₂ by variously changing the stripe pattern such as the rib width and the rib interval without the need for equipment enhancement for improving the capacity of the rolling mill. It was investigated.

When the rib width or the rib interval is changed, the area ratio between the thin portion and the thick portion (convex ribs p ₁ and p ₂ ) in the plane of the striped plate P changes. According to the change of the area ratio, the tension distribution of the material S being rolled also changes. For example, as shown in FIG. 4, the smaller the rib interval, in other words, the larger the area ratio of the thick portion, the smaller the tension in the convex ribs p ₁ and p ₂ , and the compression rib moves to the compression side. With a small tension, the material S is not easily stretched in the longitudinal direction, and as a result, the plastic flow of the material into the concave portions d ₁ and d ₂ of the hole-shaped work roll 8 is promoted, and the formed convex ribs p ₁ and p ₂ are formed. Get higher. Even when the rib width is increased, the height of the convex ribs p ₁ and p ₂ similarly increases because the area ratio of the thick portion increases. That is, the striped plate P
By increasing the rib spacing and / or increasing the rib width, which are factors that change the area ratio of the thick portion occupying the plane, the area ratio of the thick portion is increased, resulting in a high convex rib p ₁ , The formation of p ₂ becomes possible.

Assuming that the heights of the convex ribs p ₁ and p ₂ change depending on the area ratio of the thick portion, the rib length L, the rib width W, the rib interval D (FIG. 5) and the convex rib p ₁ , it was investigated examine the relationship between the height of p _2. The area ratio SR of the thick portion is determined by the rib length L,
It is geometrically calculated from the rib width W and the rib interval D according to the following equation. SR = 100 × 2 (πLW / 4) / D ² (= 50πLW
/ D ² ) As shown in the examples below, the area ratio S of the thick portion is
When securing R of 20% or more, the rib height H is 1.2 mm
The striped plate P provided with the above-mentioned convex ribs p ₁ and p ₂ is manufactured.
Moreover, because the shape enough rib height H to avoid mutual interference between the projection adjacent ribs p _1, p ₂ to form a good convex ribs p _1, p ₂ is the rib length L, a It is necessary to establish a relationship of L + W <√2 × D between the rib width W and the rib interval D. Under this condition, it is not necessary to set a particularly large rolling reduction, so that even if a rolling mill having the same capacity as the conventional one is used, the design and distinctiveness can be improved by the convex ribs p ₁ and p ₂ having a high and good shape. An improved strip P is obtained.

Although the large rib width W is effective in increasing the area ratio SR of the thick portion and increasing the rib height H,
If the rib width W is extremely large, the adjacent convex ribs p ₁ ,
p ₂ interfere with each other. Specifically, assuming a hatched region in FIG. 5, in order to avoid mutual interference between adjacent convex ribs p ₁ and p ₂ , a rib length L and a rib width W, so as to satisfy √2 × D> L + W are satisfied. Set the rib interval D. by this,
Shape collapse of the convex ribs p ₁ and p ₂ is prevented.

[0011]

[Example] SUS304 hot rolled steel sheet with a thickness of 27.88 mm
Stainless steel sheet as material S, from the first stand to the third stand
4H from the 4th stand, 6 from the 4th stand to the final stand
H, and passed through a rolling mill (FIG. 1), and a rolling speed of 575 m /
Rolled in minutes. From the first stand 1 to the sixth stand 6
Rolled to 5.86 mm in thickness between the work rolls
8 at the final stand 7 and the thickness of the thin part is 4.5
Rolled to 2 mm (32% reduction)
Rib p₁, P_TwoTo produce striped plates P (Figs. 3 and 5)
Was. The hole-shaped work roll 8 may be a roller having an outer diameter of 605 mm.
Was used. A striped plate is provided on the peripheral surface of the hole type work roll 8.
Convex rib p attached to P₁, P_TwoRib length L, rib width W,
Length L ', width W', spacing corresponding to rib spacing D, respectively
D 'represents a plurality of concave portions d ₁, D_TwoWas formed (FIGS. 2 and 6). Book
In the embodiment, the hole-shaped work roll 8 is assembled on the final stand 7.
But the stand of the previous stage without being restrained by this
Hole type work roll 8 can be incorporated in 6,5 ...
It is.

Table 1 shows the conditions for forming the convex ribs p ₁ and p ₂ . In Table 1, the present invention example 1 is compared with the conventional example in the rib spacing D.
In the second example of the present invention, the rib width W is changed as compared with the conventional example. Inventive Example 1 with reduced rib spacing D
In order to make the number of the protruding ribs p ₁ and p ₂ along the plate width direction equal to that of the conventional example, the material width was set to a value equivalent to the reduction amount of the rib interval D.

[0013]

Table 2 shows the height and rolling load per unit width of the convex ribs p ₁ and p ₂ formed in each example. As is clear from Table 2, the height of the convex ribs p ₁ and p ₂ is 1.
In contrast to 19 mm, in Example 1 of the present invention in which the rib interval D was reduced, the value was 1.35 mm, and in Example 2 in which the rib width W was increased, the value was 1.25 mm. Also,
Despite the formation of the high convex ribs p ₁ and p ₂ , it was possible to manufacture with a lower rolling load than the conventional example. This confirms that it is possible to manufacture the striped plate P provided with the high convex ribs p ₁ and p ₂ with a lower rolling load than the conventional example without increasing the rolling load.

[0015]

Next, the rib spacing D and the rib width W are variously changed to change the area ratio SR of the thick portion occupying the plane of the striped plate P, and the height of the formed convex ribs p ₁ and p ₂ is changed. The influence of the area ratio SR on it was investigated. As can be seen from the investigation results in FIG. 7, the rib height H has a close relationship with the area ratio SR, and is generally required for the striped plate P by securing an area ratio SR of 20% or more. It can be seen that a rib height H of 1.2 mm is obtained. On the other hand, in the conventional example in which the area ratio SR of the thick portion is less than 20%, the convex ribs p ₁ and p ₂ whose rib height H does not reach 1.2 mm were formed.

[0017]

As described above, in the present invention, the plastic flow of the material is ensured at the time of forming the convex rib by specifying the relationship between the rib length, the rib width, and the rib interval, and the shape is good. The striped plate is provided with a plurality of convex ribs having a sufficient height. The obtained striped plate is excellent in discriminability and design since each convex rib has a sufficient height, and is used in various fields including building materials. Moreover, since the rib height is ensured by specifying the rib shape without increasing the rolling load, a strip plate having a high commercial value is manufactured by a rolling mill having the same capacity as that of the related art.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a rolling mill for producing a striped plate.

FIG. 2 is a partial cross-sectional view showing a peripheral shape of a hole-type work roll used for forming a convex rib.

FIG. 3 is a partial cross-sectional view of a striped plate on which convex ribs are formed.

FIG. 4 is a graph showing an influence of a rib interval on a tension applied to a material during rolling.

FIG. 5 is a partial plan view of a striped plate provided with a convex rib.

FIG. 6 is a partial plan view showing a peripheral surface of a grooved work roll having a concave portion.

FIG. 7 is a graph showing the effect of the area ratio of the thick portion on the rib height.

[Explanation of symbols]

1-6: Each stand of the rolling mill 7: Final stand
8: Hollow work roll d ₁ , d ₂ : concave portion provided on the peripheral surface of the hollow work roll
L ': the length of the recess W': the width D of the recess': distance recess S: Material P: striped plate p _1, p _2: convex ribs formed on the surface of the fringe plate L: rib length W: rib Width D: Rib interval H:
Rib height

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Hara 1 Tsurumachi, Amagasaki-shi, Hyogo F-term in Nisshin Steel Co., Ltd. Technical Research Institute 4E002 AD10 BB09 BC01 4E016 AA02 BA01 BA10 CA09 DA13

Claims (2)

[Claims] 1. A striped plate in which a plurality of convex ribs are formed on a plate surface, wherein a rib length of the convex rib is L, a rib width is W, and an interval between adjacent convex ribs is D. Then SR = 5
A striped plate, characterized in that the area ratio SR of the rib forming portion calculated as 0πLW / D ² is 20% or more, and a relationship of L + W <√2 × D is satisfied. 2. A method of manufacturing a striped plate having a plurality of convex ribs by rolling a material with a rolling mill incorporating a grooved work roll, wherein a rib length L, a rib width W, and a rib interval of the convex ribs are provided. A plurality of concave portions are formed on the peripheral surface of the roll with a length L ′, a width W ′, and a rib interval D ′ corresponding to D, respectively, and SR ′ = 50πL′W ′
/ D' ² calculated as area ratio SR 'of the concave portion is 20
%, Wherein a convex rib is formed on the surface of the material by a hole-shaped work roll satisfying the relationship of L ′ + W ′ <√2 × D ′.