JP2001071070A - Manufacture of columnar member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for a columnar member which can prevent generation off mill scale caused by heating of a square steel tube, eliminate cracks of worked parts, and ensure the excellent working accuracy by drawing an end part of the columnar member formed of the square steel tube to form a squeezed shaft-like part of a required section. SOLUTION: In forming a squeezed shaft-like part 14 of the required section by drawing an end part of a columnar member 12 formed of a square steel tube, the squeezed shaft-like part 14 is drawn at heating temperature of the square steel tube in a range of 450-650 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a columnar member formed of a rectangular steel pipe, for example, a column for a building.

[0002]

2. Description of the Related Art For example, in a steel structure building, a rectangular steel pipe is generally used as a pillar, and an H-shaped steel is used as a beam. FIG. 6A shows a column 1 made of a square steel pipe,
The upper and lower beams 2 and 3 made of shaped steel are shown as bolted. Column material 1 made of such a square steel pipe material
Since the bolts cannot be attached to the beam members 2 and 3 with the rectangular steel tube material as it is, it is necessary to attach rectangular mounting plates with bolt holes to the upper and lower ends of the rectangular steel tube material. In this case, if the mounting plate is formed to be larger than the diameter of the rectangular steel pipe material and is mounted on the upper and lower ends of the rectangular steel pipe material in a flanged manner, the mounting area is increased and the beam material 2 is increased.
3 and runs into a wall plate or the like attached to the column member 1.

Accordingly, in the case of a column member 1 made of a square steel pipe, as shown in FIG. 6A, the column member 1 is composed of a column main body 4 and bolt mounting members mounted on upper and lower ends thereof. Blocks 5 and 5 are formed, and both blocks 5 and 5 are bolted to upper and lower beam members 2 and 3, respectively. Each of the bolt mounting blocks 5 has a rectangular welding seat plate 6 and a mounting plate with bolt holes 7a corresponding to the cross-sectional shape of the column body 4, respectively, as shown in FIGS. 7 and a pair of angle members 8 for forming a bolt attachment / detachment space interposed between the two plates. The welding seat plate 6 is welded to each of the upper and lower end surfaces of the column member main body 4 to form the pair of angles. One end of each of the angle members 8 and 8 is welded to the outer end surface of the welding seat plate 6 with the members 8 and 8 aligned in a cross shape in plan view, and a bolt hole 7a is provided on the other end of each of the angle members 8 and 8. Mounting plate 7
Are welded to form four bolt attachment / detachment space portions 9 by the two angle members 8, 8 interposed between the two attachment plates 7, 7,
The bolt holes 7 a of the mounting plate 7 are opposed to the respective spaces 9. According to such a column member 1, when attaching to the upper and lower beam members 2 and 3, the bolt attaching / detaching space portion 9 of each block 5 is used.
Each bolt 10 can be screwed into the screw hole of each of the upper and lower beam members 2 and 3 from the bolt hole 7a of the mounting plate 7, and can be removed by utilizing the above.

However, in the column material 1 as described above,
Bolt mounting blocks 5 provided at both ends of the column body 4
It takes a lot of trouble and time to manufacture and assemble by welding, so that the cost of the column 1 is high. Therefore, the present applicant has previously drawn the end portion of the column member body 4 to form a crushed shaft portion having a required cross-sectional shape at the end portion, and attached and detached a bolt to the outer peripheral portion of the crushed shaft portion. We proposed a building column material that has a space for the building and a column mounting plate fixed to the end surface of the crushed shaft. According to such a column material, the number of parts is reduced as compared with the above-described column material, and welding work is not required, the production of the column material is facilitated, and the cost can be reduced.

[0005]

When the end of the column body 4 is drawn as described above, heating is required. However, depending on the heating temperature in this case, the surface of the rectangular steel pipe material may be milled. There are problems such as generation of scale and cracking of the processed portion, thereby lowering the processing accuracy.

The present invention prevents the generation of mill scale due to heating of a rectangular steel pipe material when forming a crushed shaft part having a required sectional shape by drawing an end of a columnar member made of a rectangular steel pipe material. It is an object of the present invention to provide a method for manufacturing a columnar member that can ensure good processing accuracy by eliminating cracks in the material.

[0007]

According to the first aspect of the present invention, there is provided a method for manufacturing a columnar member, comprising:
In forming the crushed shaft portion 14 having a required cross-sectional shape by drawing the end portion of the crushed shaft portion 14, the crushed shaft portion 14 is formed by drawing at a heating temperature of the square steel pipe material of 450 to 650 ° C. It is characterized by doing.

[0008]

FIG. 1 shows a pillar 11 manufactured by the method of the present invention. The column member 11 has a column member body 12 made of a square steel pipe made of four flat wall portions a and four corner portions b between the flat wall portions a,
Each of the upper and lower ends of the column body 12 is crushed evenly from each corner b by press working, and a crushed shaft-like portion 14 having a substantially cross-shaped cross section composed of four ridges 13 is provided at the end. It is formed concentrically.

As can be seen particularly from the plan view of FIG. 2, each of the ridges 13 of the crushed shaft 14 is on an extension of each of the flat wall portions a forming the column body 12, and the flat wall portions It is formed so as to be flush with the portion a or to fit therebelow. The crushed shaft 14 having a substantially cruciform cross section is formed in a hollow shape, and the hollow portion 14a has a cruciform cross section. In addition, the crushing shaft portion 14 having a substantially cross-sectional shape is used.
Are formed between four opposing side surfaces of the four protruding ridges 13.

When the column mounting plate 16 is attached to the end face of the crushed shaft 14, the bolt 10 (see FIG. 4) is attached to and detached from the bolt hole 16 a of the plate 16. It is a space part for. The column member mounting plate 16 is a square plate corresponding to the outer shape of the column member main body 12 having a square cross section. Bolt holes 16a are provided at four corners of the column member mounting plate 16, and as shown in FIG. The shaft portion 14 is fixed to the end face of the crushed shaft portion 14 by welding in a state of facing the bolt attaching / detaching spaces 15. An opening 16b may be provided at the center of the pillar mounting plate 16.

As can be seen from FIGS. 2 and 3, each of the crushing shafts 14 of the column body 12 has four ridges 1.
Numerals 3 are located at the respective widthwise central portions of the four flat wall portions a of the rectangular column material main body 12 on the extension, and each of the bolt attaching / detaching space portions 15 is provided.
Is located on the extension of the corner b of the column body 12.

In order to manufacture the column member 11, a rectangular steel tube having a length corresponding to one column member 11 is used, and upper and lower ends of a column main body 12 made of the rectangular steel tube are angled. From the part b side, it is narrowed down by a plurality of pressure forming rollers in a heating atmosphere over a required length, and the four protruding ridges 13 are respectively extended widths of the four flat wall parts a of the rectangular column main body 12. The four ridges 13 are crushed so as to be located at the center in the direction, and are set so as to be flush with or lower than the four flat walls a, respectively, as shown in FIG. At each of the upper and lower ends of the column body 12, a crushed shaft portion 14 having a substantially cross-shaped cross section
Is formed.

In the drawing process of the end portion of the square steel pipe in the production of the column member 11, it is necessary to place the square steel pipe in a heating atmosphere as described above, that is, to heat the square steel pipe to a predetermined temperature. In this case, the heating temperature of the steel pipe material is
The temperature is set in the range of 450 to 650 ° C. for the following reason.

That is, when the temperature of the steel pipe material at the time of working is less than 450 ° C., a large pressing force is required, which increases the size and weight of the equipment. Cracks occur in the mountain folds (protrusions 13) and valley folds (between the ridges 13 and 13) of the portion 14, and in the case where the square steel pipe material is made of welded pipe material, Cracks are generated, and the variation in shape is increased. On the other hand, when the temperature of the steel pipe material exceeds 650 ° C., when the square steel pipe material is a black scale material, the generation and peeling of mill scale increase, and when the rectangular steel pipe material is a plating material, the plating peels off and heat energy increases.

On the other hand, by suppressing the temperature of the steel pipe material to 650 ° C. or less, it is possible to completely suppress the generation of mill scale generated on the surface of the steel pipe material, and therefore, it becomes unnecessary to remove the mill scale after processing. Also, even if the square steel pipe material is a plating material, there is no peeling of the plating. In addition, by heating the rectangular steel tube material to 450 ° C. or higher, workability is greatly improved, equipment can be reduced in weight, cracks in a processed portion are eliminated, and shape accuracy is improved.

In using the column member 11 having the above-described structure, as shown in FIG. 4, the column member 11 is disposed between the upper and lower beams 2 and 3 made of H-section steel, and the upper end thereof is used. Of the upper beam member 2 and the lower surface of the flange member 3a of the lower beam member 3, and the column member mounting plate 16 of the lower beam member 3 abuts on the lower surface of the flange member 3a. In each of the upper and lower ends, the bolt holes 16a of the column member mounting plate 16 and the bolt holes 16 of the beam members 2 and 3 are utilized by using the respective bolt attaching / detaching spaces 15 formed around the crushed shaft portion 14. (Not shown)) and fastened with nuts.

In this pillar 11, since each bolt attaching / detaching space 15 is formed as an extension of the corner b of the pillar main body 12, see FIGS. 2, 4 and 7. As will be understood, when the column material mounting plate 16 is mounted on the flange 2a of each of the beams 2 and 3 made of H-section steel,
Two bolt attaching / detaching spaces 15 are located on both front and rear sides of the third web 2b, so that two bolts 10 can be used on two opposing sides of the pole mounting plate 16.

By the way, if each bolt attaching / detaching space 15 is formed as an extension of the flat wall portion a of the column member main body 12, two bolt attaching / detaching along the web 2b of each beam 2, 3 will be described. Since the space 15 is located, only one bolt attaching / detaching space 15 is located on each of the front and rear sides of the web 2b, so that two bolt attaching / detaching spaces located along the web 2b. In the case of 15, the bolt 10 cannot be used.

Further, according to the column material 11, each ridge 13 of the crushed shaft portion 14 having a substantially cross-shaped cross section is on the extension of each plane wall portion a forming the column material main body 12, and Since it is formed so as to be flush with or lower than the flat wall portion a, for example, a finishing wall member 17 is disposed along the outer surface of the column member 11 as shown in FIG. In this case, the ridges 13 of the upper and lower crushing shafts 14 do not become obstacles, so that it is not necessary to cut off a part of the finishing wall material 17.

That is, assuming that the ridge 13 of the crushed shaft 14 is formed to protrude from the flat wall portion a of the column main body 12, if the wall member 17 is arranged as shown in the figure, The inconvenience is that a part of the wall member 17 facing the protrusion 13 must be cut off because the wall member 17 cannot be disposed as it is because the protrusion 13 becomes an obstacle protrusion.

Further, the pillar 11 has four ridges 13.
Is formed in a hollow shape, when the column material 11 is immersed in the processing tank to perform plating or electrodeposition coating, the treatment liquid is allowed to flow into the crushed shaft portion 14. Therefore, the internal corrosion of the crushed shaft 14 can be prevented. In particular, the crushable shaft-shaped portions 14 are provided at both ends of the column body 12 respectively.
Is formed, it is very effective because the processing liquid can be surely flowed into the interior of the column body 12 through the hollow portions of the both crushed shaft portions 14.

Further, if an opening 16b is provided at the center of the column mounting plate 16, as shown in FIG. 3, the column mounting plate 16 is mounted on the end face of the crushed shaft portion 14 in a state where the column mounting plate 16 is mounted. Even when the material 11 is immersed in the treatment tank to perform plating or electrodeposition coating, the opening 16b serves as a drain hole, and the processing liquid flows from the drain hole to the hollow portion 14a of the hollow crushed shaft portion 14. Then, the column material 11 flows into the column material main body 12 so that the column material 11 sinks without being lifted, so that a desired plating process or the like can be performed.

[0023]

According to the method for manufacturing a columnar member according to the first aspect of the present invention, when the end of the columnar member made of a rectangular steel pipe is drawn to form a crushed shaft having a required cross-sectional shape, The heating temperature of the square steel tube material is 450
Since it was formed by drawing in the range of ６650 ° C., by setting the temperature of the steel pipe to 650 ° C. or less, the generation of mill scale generated on the surface of the steel pipe can be completely suppressed. This eliminates the need for mill scale removal, and eliminates peeling of plating even when the square steel pipe is a plated material. Further, by setting the temperature of the steel pipe material to 450 ° C. or higher, the workability is greatly improved, the equipment can be reduced in weight, the crack in the drawn portion can be eliminated, and the shape accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of an architectural column manufactured by the method of the present invention.

FIG. 2 is a plan view showing a crushed shaft portion of the column material.

FIG. 3 is a perspective view showing a state in which a column mounting plate is attached to an end face of a crushed shaft portion of the column.

FIG. 4 is a perspective view showing a use state of the column material.

FIG. 5 is a side view showing a usage state of the column material.

6 (A) is a perspective view showing a usage state of a conventional building column, FIG. 6 (B) is a perspective view showing a column main body of the building column, and FIG. 6 (C) shows a bolt mounting block. It is an exploded perspective view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Building column material 12 Column material main body 13 Protrusion part 14 Crush shaft part 15 Bolt attaching / detaching space part 16 Column mounting plate

Continued on the front page F term (reference) 2E125 AA03 AA13 AB01 AB16 AC15 AC16 AG12 AG43 AG55 AG57 BE10 CA05 2E163 FA02 FB07 FB09 FB21 FB34 FB41

Claims (1)

[Claims] In forming a crushed shaft portion having a required cross-sectional shape by drawing an end of a columnar member made of a square steel tube material, the crushed shaft portion has a heating temperature of 45 ° for the square steel tube material.
A method for producing a columnar member, wherein the columnar member is formed by drawing in a range of 0 to 650 ° C.