JP2009067250A - Shape steel for cell guide and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shape steel for a cell guide capable of improving efficiency for storing containers in a container vessel by using the cell guide, achieving the weight reduction of the cell guide, and reducing manufacturing cost by manufacturing the cell guide by means of a hot rolling method, and its manufacturing method. <P>SOLUTION: A grooved rolling roll is applied to roll down a steel material 6 which has a rectangular cross section after being heated up to a predetermined temperature to form an intermediate material having a curved part 7 in an arc shape at the center of the cross section vertical to a longitudinal direction, two legs 8 obliquely extending from the curved part, and two projections 9 extending outward from tips of the legs. Then the curved part of the intermediate material is bent to set the legs to be parallel to each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a shape steel suitable for a cell guide used in a container ship for transporting a large number of containers by sea (hereinafter referred to as a shape steel for a cell guide), and a manufacturing method thereof.

  A container ship is a ship for transporting a large number of containers by sea, and a plurality of partition walls are provided in the ship body. When the container is loaded, the container moves from the upper side to the lower side along the partition wall by the crane. When the container is loaded, the container moves from the lower side to the upper side along the partition wall. Therefore, as shown in FIG. 10, members (hereinafter referred to as cell guides) for guiding the four corners of the container are disposed on the partition wall.

  Conventionally, a section steel has been used for the cell guide 1, and in particular, one in which an equilateral mountain section steel 4 as shown in FIG. 12 is welded to a rib 5 is widely used. FIG. 11 is a perspective view of the cell guide 1. The equilateral angle steel 4 generally has a side length of about 130 to 150 mm and a thickness of about 15 mm. The rib 5 is obtained by cutting a steel plate having a thickness of about 10 to 15 mm into a T shape, and plays a role of fixing the equilateral mountain steel 4 to the partition wall 3. In addition, the space | interval L between the outer surfaces of the equilateral angle steel 4 is often about 60 mm recently. When the cell guide shown in FIG. 12 is manufactured, the steel plate is cut to manufacture the rib 5, and the equilateral angle steel 4 is welded to the rib 5. Since the two sides of the equilateral angle steel 4 and the rib 5 are welded, not only the welding operation is performed in a narrow space, but also the welded portion becomes long, and a problem of productivity reduction occurs in the manufacturing process of the cell guide 1.

  On the other hand, Patent Document 1 discloses a cell guide using a shape steel having the shape shown in FIG. Since this technique uses the cell guide shaped steel 6 having the shape shown in FIG. 13, the strength of the cell guide is increased and the number of welds is reduced by making the shape of the rib (not shown) rectangular or trapezoidal. Can do. As a result, it is possible to shorten the time required for manufacturing the cell guide and reduce the manufacturing cost. In Patent Document 1, rolling rolls having a hole shape as shown in FIG. 15 (so-called caliber rolls) are sequentially used in the process of manufacturing the cell guide shaped steel 6. And the space | interval L of the outer surfaces of the leg part 8 of the obtained section steel 6 for cell guides is 90 mm.

When the interval L between the outer surfaces of the leg portions 8 is increased, the gap between the containers 2 shown in FIG. In order to increase the container accommodation efficiency, the interval L between the outer surfaces of the legs 8 must be reduced.
In manufacturing the cell guide shaped steel 6 as shown in FIG. 13 using the technique disclosed in Patent Document 1, in order to set the distance L between the outer surfaces of the legs 8 to about 60 mm, FIG. It is necessary to use a rolling roll having a hole shape as shown. Moreover, the base 10 of the cell guide structural steel 6 disclosed in FIGS. 13 and 14 is flat, and in order to form the base 10 flat, the top surface of the convex portion of the upper roll of FIG. Need to touch.

That is, in the technique disclosed in Patent Document 1, it is necessary to reduce the width of the convex part of the upper roll as shown in FIG. In addition, the convex portion of the upper roll must be inserted deeply into the concave portion of the lower roll. Since the cell guide shaped steel 6 is manufactured by hot rolling, the temperature of the convex portion of the upper roll rises significantly during rolling, and deformation and breakage are likely to occur. In other words, with the technique disclosed in Patent Document 1, it is difficult to stably manufacture a large number of cell guide shaped steels 6 in which the distance between the outer surfaces of the leg portions 8 is narrow.
Japanese Patent Laid-Open No. 2002-274483

  The present invention provides a cell guide that can increase the container storage efficiency in a container ship when used as a cell guide, reduce the weight of the cell guide, and reduce the manufacturing cost by stably producing a large amount by hot rolling. An object of the present invention is to provide a structural steel and a manufacturing method thereof.

The present invention has a U-shaped portion composed of a curved portion whose cross section perpendicular to the longitudinal direction has an arc shape, and two leg portions extending in parallel with each other from both ends of the curved portion. It is a shape steel for a cell guide in which two protrusions extending in the vertical direction and extending outward are provided at the tips of the legs.
In the cell guide steel of the present invention, it is preferable that the distance between the outer surfaces of the leg portions is in the range of 30 to 80 mm. Further the thickness T ₁ of the projecting portion, the thickness T ₃ of thickness T ₂ and the bending of the legs, it is preferable to satisfy the relation _{T 1> T 2> T 3} .

  In addition, the present invention provides a curved portion that exhibits a circular arc shape in the center of a cross section perpendicular to the longitudinal direction by heating a steel material having a rectangular cross section to a predetermined temperature and then applying a reduction using a rolling roll having a hole shape. And an intermediate material having two leg portions extending obliquely from the curved portion and two projecting portions extending outward from the distal ends of the leg portions, and further, the curved portion of the intermediate material is formed by a subsequent hole shape. It is a manufacturing method of the section steel for cell guides which forms a leg part in parallel with each other.

In the method for manufacturing a steel for a cell guide according to the present invention, when the curved portion of the intermediate material is bent, a gap is provided between the tip of the convex portion of the rolling roll arranged in the U-shaped portion and the inner surface of the curved portion. Is preferred. Furthermore, it is preferable that the leg portion and the protruding portion of the intermediate material form a right angle.
In the present invention, the curved portion has an arc shape, but is not necessarily a perfect circular arc, and may be an elliptical arc.

  ADVANTAGE OF THE INVENTION According to this invention, the shape steel for cell guides can be stably manufactured in large quantities by hot rolling, and manufacturing cost can be reduced. In addition, when used as a cell guide, it is possible to improve the container accommodation efficiency and reduce the weight of the cell guide in the container ship.

First, the cell guide shape steel of the present invention will be described.
FIG. 1 is a cross-sectional view schematically showing an example of a cell guide shape steel of the present invention. The cross section is a plane perpendicular to the longitudinal direction of the cell guide steel.
As shown in FIG. 1, the cell guide section 6 of the present invention includes an arcuate curved portion 7, two legs 8 extending in parallel with each other from both ends of the curved portion 7, and the tips of the legs 8. It consists of two protrusions 9 extending vertically and outward. That is, one end of the leg portion 8 is connected to the curved portion 7 and the other end is connected to the protruding portion 9. The curved portion 7 is not flat like the cell guide steel shown in FIG. 14, but has a curved arc shape. This point will be described later in connection with the method for manufacturing the cell guide section 6. Note that the leg portion 8 and the curved portion 7 are collectively referred to as a U-shaped portion.

  This cell guide section 6 is welded to the rib 5 to form a cell guide. FIG. 2 is a cross-sectional view showing an example of the cell guide. Since the cell guide section 6 is integrally formed by hot rolling, it has sufficient strength. Therefore, when manufacturing the cell guide, it is not necessary to fill the rib 5 inside the U-shaped portion, and the assembly of the cell guide is facilitated. That is, only the contact surface between the cell guide structural steel 6 and the rib 5 is welded, and the welding length can be greatly reduced as compared with the cell guide shown in FIG.

  The distance L between the outer surfaces of the legs 8 is preferably in the range of 30 to 80 mm. If the distance L between the outer surfaces of the leg portions 8 is less than 30 mm, the inside of the U-shaped portion becomes narrow, so that it becomes difficult to manufacture the cell guide shape steel by hot rolling. On the other hand, when the distance L exceeds 80 mm, the length of the leg portion 8 is shortened as the radius of the curved portion 7 increases, so that not only the function of guiding the four corners of the container is deteriorated, but also FIG. Since the gap between the containers 2 shown is widened, the container accommodation efficiency is reduced.

Further, when the thickness of the protruding portion 9 is T ₁ , the thickness of the leg portion 8 is T ₂ , and the thickness of the curved portion 7 is T ₃ , it is preferable that T ₁ > T ₂ > T ₃ . By making the thickness T ₁ of the protrusion 9 the largest, it is possible to obtain sufficient strength by welding to the rib 5 as shown in FIG. On the other hand, by making the thickness T ₃ of the bending portion 7 the smallest, the bending portion 7 can be preferentially bent by hot rolling described later. Since one end of the leg portion 8 is connected to the curved portion 7, the rigidity is increased. Therefore, the thickness T ₂ of the leg portion 8 is made thinner than the thickness T ₁ of the protruding portion 9 to reduce the weight of the cell guide shape steel (that is, the weight of the cell guide).

Next, the manufacturing method of the shape steel for cell guides of this invention is demonstrated.
FIG. 4 is a cross-sectional view sequentially showing the hole shape of the rolling roll used in the manufacturing process of the cell guide steel.
After the steel material having a rectangular cross section is heated to a predetermined temperature, the rolling roll exhibits an arc shape at the center of the cross section perpendicular to the longitudinal direction, as shown in FIGS. 4 (a) to 4 (d). An intermediate material having a W-shape having a curved portion and two leg portions extending obliquely from the curved portion and two projecting portions extending outward from the tips of the leg portions is obtained. In the process, the center in the width direction (that is, the portion corresponding to the curved portion of the cell guide shape steel) is thinned. At this stage, it is preferable to apply the reduction so that the leg portion and the protruding portion form a right angle.

  Further, with the rolling roll that follows, the curved portion of the intermediate material is bent as shown in (e) to (f) of FIG. 4, the legs are arranged in parallel to each other, and the U-shaped portion composed of the curved portion and the legs To obtain a cell guide section. At this time, since bending deformation concentrates on a portion where the thickness in the center in the width direction is thin (that is, a portion corresponding to the curved portion of the cell guide shape steel), the cell guide shape steel can be easily manufactured. In (e) to (f), in order to stabilize the bending deformation, it is preferable to apply a reduction at a reduction ratio of about several percent.

Further, as shown in FIG. 4 (f), it is preferable to provide a gap between the tip of the convex part of the rolling roll arranged in the U-shaped part and the inner surface of the curved part. By providing this gap, it is possible to reduce the depth at which the convex portion of the rolling roll enters the concave portion of the opposing rolling roll, and the deformation and breakage of the convex portion of the rolling roll can be suppressed.
When the cell guide shape steel is manufactured by hot rolling in this way, no rolling is applied to the curved portion, and a U-shape curved in an arc shape by bending is obtained. The curved portion does not necessarily have to be a perfect circular arc, but may be an elliptical arc.

  In addition, in FIG.4 (f), when the cell guide shape steel is manufactured using the flat rolling roll and the rolling roll which has a recessed part, without providing the convex part of the rolling roll arrange | positioned in a U-shaped part, FIG. The opening of the U-shaped part as shown in FIG. The shaped steel for a cell guide having such a shape is not suitable for practical use since the parallelism of the leg portions cannot be ensured. In order to prevent the opening of the curved portion from being blocked, the convex portion of the rolling roll of FIG. 4 (f) is inserted to a depth of about 1/3 to 2/3 of the concave portion of the opposing rolling roll. It is preferable.

  A steel material having a rectangular cross section was hot-rolled to produce a cell guide steel having the dimensions shown in FIG. 5 (unit: mm). A rolling roll having a hole shape shown in FIG. 4 was used. In addition, if it sets so that the convex part of the rolling roll of FIG.4 (f) may be inserted in the depth of about 1/2 of the concave part of the opposing rolling roll, even after hot-rolling 500 tons of steel materials, There was no deformation or breakage. This cell guide shape steel is referred to as invention example 1.

FIG. 16 shows the dimensions (unit: mm) of the equilateral angle steel (hereinafter referred to as Comparative Example 1) used for the cell guide shown in FIG.
Furthermore, a steel for a cell guide having the dimensions shown in FIG. 17 (unit: mm) was manufactured. The rolling roll was hot-rolled using the one having the hole shape shown in FIG. Note that the convex portion of the rolling roll in FIG. 15 (f) was inserted deep into the concave portion of the opposing rolling roll, and the bottom side was reduced by the convex portion tip surface of the upper roll and the concave bottom surface of the lower roll. As a result, the hot rolling was stopped because the convex portion was damaged after hot rolling of 120 tons of steel material. This section steel for cell guide is referred to as Comparative Example 2.

In addition, when it sets so that the convex part of the rolling roll of FIG.15 (f) may be inserted in the depth of about 1/2 of the recessed part of the opposing rolling roll, the obtained shape steel for cell guides is as shown in FIG. The leg close to the base deformed. The cell guide shaped steel having such a leg portion does not ensure the parallelism of the leg portion, which causes a problem when used as a cell guide.
The cross-sectional areas of Invention Example 1 and Comparative Examples 1 and 2 are as shown in Table 1. It can be seen that the cross-sectional area of Invention Example 1 is the smallest, and is suitable for weight reduction of the cell guide shape steel (that is, weight reduction of the cell guide).

  Next, the cell guide steel of Example 1 was welded to the rib to produce the cell guide shown in FIG. 2 (hereinafter referred to as Example 2). Although not shown, a cell guide (hereinafter referred to as Comparative Example 4) in which the cell guide shape steel of Comparative Example 2 was welded to a rib was manufactured. Finite element analysis of the amount of deformation when a load is applied to the cell guide of Invention Example 2 and Comparative Example 4 and the cell guide shown in FIG. 12 using the equilateral angle steel of Comparative Example 1 (hereinafter referred to as Comparative Example 3). Calculated by the method.

  When calculating by the finite element analysis method, a cell guide with a length of 2590 mm corresponding to the height of the container is assumed as shown in FIG. 6, and the cell guide shape steel or the equilateral mountain shape steel from the lateral direction in the center of the cell guide. A model for applying a load was created. As the boundary conditions, both ends of the cell guide were completely constrained, the loads were 9.8 kN, 19.6 kN, 29.4 kN, and 39.2 kN, and the maximum value of the lateral displacement (mm) was obtained. The results are shown in Table 2 and FIG.

As is apparent from Table 2, the cell guide of Invention Example 2 has a lateral displacement (mm) of 1/10 or less that of Comparative Example 3, and the strength is remarkably improved. Further, the cell guide of Invention Example 2 had a smaller lateral displacement (mm) than that of Comparative Example 4.
In other words, the cell guide shape steel manufactured by applying the present invention (Invention Example 1) had the smallest cross-sectional area, and the cell guide using the cell guide shape steel (Invention Example 2) had the highest strength.

It is sectional drawing which shows the example of the shape steel for cell guides of this invention typically. It is sectional drawing which shows typically the example of the cell guide manufactured using the structural steel for cell guides shown in FIG. It is a perspective view of the cell guide shown in FIG. It is sectional drawing which shows the hole shape of the rolling roll used in the manufacturing process of the shaped steel for cell guides shown in FIG. 1 sequentially. It is sectional drawing which shows the dimension of the structural steel for cell guides of the invention example. It is a perspective view which shows the model of a finite element analysis method. It is a graph which shows the data calculated | required with the finite element analysis method. It is sectional drawing which shows typically the example of the structural steel for cell guides manufactured for the comparison. It is sectional drawing which shows typically the example of the structural steel for cell guides manufactured for the comparison. It is sectional drawing which shows typically the example which arrange | positions the conventional cell guide to a partition. FIG. 11 is a perspective view of the cell guide shown in FIG. FIG. 11 is an enlarged cross-sectional view of the cell guide shown in FIG. It is a perspective view which shows the other example of the conventional cell guide typically. FIG. 14 is a cross-sectional view of the cell guide section shown in FIG. FIG. 14 is a cross-sectional view sequentially showing a hole shape of a rolling roll used in the manufacturing process of the section steel for cell guide shown in FIG. FIG. 13 is a cross-sectional view showing dimensions of the cell guide shown in FIG. It is sectional drawing which shows the dimension of the cell guide manufactured for the comparison. FIG. 14 is a cross-sectional view showing a hole shape of a rolling roll used for narrowing the distance between the outer surfaces of the legs of the cell guide shaped steel shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cell guide 2 Container 3 Bulkhead 4 Equilateral mountain-shaped steel 5 Rib 6 Shape steel for cell guides 7 Curved part 8 Leg part 9 Protruding part
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Claims (6)

  A U-shaped portion comprising a curved portion whose cross section perpendicular to the longitudinal direction has an arc shape, and two leg portions extending in parallel with each other from both ends of the curved portion, and the vertical direction of the leg portion A cell guide shape steel, wherein two projecting portions extending outward are provided at a tip of the leg portion.   The section steel for cell guides according to claim 1, wherein a distance between outer surfaces of the leg portions is in a range of 30 to 80 mm. The thickness T _{1 of the} protruding portion, the thickness T _{2 of the} leg portion, and the thickness T _{3 of the} curved portion satisfy a relationship of T ₁ > T ₂ > T _3. Shaped steel for cell guides.   After heating the steel material having a rectangular cross section to a predetermined temperature, the steel material is subjected to reduction using a rolling roll having a hole shape, and has a curved portion exhibiting an arc shape at the center of the cross section perpendicular to the longitudinal direction, and An intermediate material having two leg portions extending obliquely from the curved portion and two projecting portions extending outward from the distal ends of the leg portions, and further bending the curved portion of the intermediate material by a subsequent hole shape The leg portions are formed in parallel to each other, and a method for producing a section steel for cell guides.   The said intermediate | middle raw material WHEREIN: When bending the said curved part, a clearance gap is provided between the front-end | tip part of the convex part of the rolling roll arrange | positioned in the said U-shaped part, and the inner surface of the said curved part. A method for manufacturing a section steel for a cell guide.   The method for producing a section steel for a cell guide according to claim 4 or 5, wherein the leg portion of the intermediate material and the protruding portion form a right angle.

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