JP5392811B2 - Method for manufacturing L-shaped structural member - Google Patents

Description

  The present invention is an easy to use L-shaped structural member made of grooved steel or angle steel, such as a structural material that forms an outer wall frame for prefabricated houses, and a mounting bracket used to attach an outer wall panel to a beam or the like. It relates to a manufacturing method.

For example, as shown in FIG. 1, an L-shaped structural member forming an outer wall frame for a prefabricated house is formed by using grooved steels 1 and 2 as raw materials and joining the ends thereof. In this example, one end 3 is pressed to narrow the flange interval, and fitted to the other end, and both groove steels are fixed using a welding method, a rivet joining method, a caulking joining method, or the like. Yes. In FIG. 1, 4 is a rivet.
Further, as shown in FIG. 2, it is also proposed to manufacture by bending 90 ° notches 6 into both flange portions of the channel steel 5 and bending the contacted flange portions after welding. .

For example, in Patent Document 1, notches having a right-angled isosceles triangle shape are provided on both side portions along two opposite sides of a rectangular shape member so that apex angles thereof are perpendicular to the two sides. The two folds are perpendicular to each other so that the lines parallel to the two sides pass through the apex angles of the isosceles triangles, and the lines connecting the apex angles are creased. It is manufactured by bending both side parts at right angles.
Actually, the following manufacturing form is adopted by developing the above technology. That is, as shown in FIG. 2, after bending 90 ° notches 6 in both flange portions of the grooved steel 5 and bending the notched ends of the flange portions, an L-shaped structural member is formed. .
JP 2000-336768 A

However, in order to manufacture the L-shaped structural member as shown in FIG. 1, a secondary material is required, and material management becomes complicated. In addition, the process becomes complicated, resulting in high costs. Furthermore, when the welding method is employed, there is a problem that the working environment deteriorates due to generation of fumes.
In the method as shown in FIG. 2, when the notched end of the flange portion is abutted, the abutting surface is likely to be displaced, and as a result, the strength becomes unstable. Therefore, in order to eliminate the deviation and stably develop the required strength, the butt portion is welded. This method also takes time and effort to make the cutout, and welding leads to a worse working environment. In addition, it is necessary to finish or repair the weld.

Furthermore, in an L-shaped structural member used for a home appliance frame or the like, an attempt is made to form an angle steel as a material. When manufacturing an L-shaped structural member by bending an angle steel, there is a problem similar to the case of using a grooved steel as a raw material.
The present invention has been devised to solve such problems, and a method for manufacturing an L-shaped structural member made of channel steel or angle steel as a raw material without compromising the working environment. The purpose is to provide.

In order to achieve the object, the manufacturing method of the L-shaped structural member according to the present invention applies a preforming punch from both sides to the flange portion of the material grooved steel, and the length of the flange portion of the material grooved steel and the grooved steel. A pre-bending process is performed on the flange portion by vertically pressing a conical surface intersecting portion of the triangular pyramid action portion of the pre-bending punch whose action portion is a triangular pyramid to a line of the flange portion intersecting a plane perpendicular to the direction. After the application, the web part of the material grooved steel is pressed by a bending punch whose action part has a V-groove shape, and the intersection of the flange part of the material grooved steel and the web part and the line of the flange part are The two straight lines that form the ridges are the two flanges that have been subjected to the pre-bending of the channel steel, with two straight lines that extend in the direction of 45 ° with respect to the line of the flanges from the point of intersection. Fold it inside the channel steel until the Characterized in that bending the blanking portion to the flange portion formation side.
When the angle steel is used as a material, a preforming punch is formed on one side of the material angle steel, and one side of the angle iron is intersected with a side perpendicular to the longitudinal direction of the angle steel. After preliminarily bending one of the sides of the pre-bending punch whose pre-bending punch has a triangular pyramid acting on the line, the pre-bending process is applied to the one side, Is pressed with a bending punch having a V-groove acting portion, and the line of the two sides of the angle iron and the line of the one side intersect each other with respect to the line of the one side. the one of the sides the preliminary bending of the two straight lines extending in the direction the mountain angle steel has been subjected to form a 45 °, other side of the angle iron to said two straight lines a mountain contact with each other And the other side of the angle steel is bent to the one side forming side.

According to the present invention, an L-shaped structural member made of channel steel or angle steel can be stably manufactured at low cost and without reducing strength. In addition, by using the method of the present invention, a U-shaped structural member and a U-shaped structural member can be manufactured at low cost.
Therefore, according to the method of the present invention, it becomes possible to stably supply a steel structural member for home use such as an outer wall frame for prefabricated housing and a home appliance frame at a low cost. This will lead to expansion of the scope of application.

As described above, when the method as shown in FIG. 2 is adopted when manufacturing the L-shaped structural member using the grooved steel as a raw material, the abutting surface is displaced when the notched end of the flange portion is abutted. Therefore, there is a possibility that the strength may be reduced, and the butt portion must be welded. For this reason, various problems have arisen.
Accordingly, the present inventors have intensively studied a method for manufacturing an L-shaped structure member that exhibits a required strength without making a notch and without performing welding.
In the process, it was found that a L-shaped structural member having high strength can be easily manufactured by bending the flange portion of the grooved steel inward and performing bending.
The same applies to the case of using angle steel. If bending is performed by folding one side of the angle steel to the other side, an L-shaped structural member with high strength can be easily manufactured.

Below, the detail of the processing method when using a channel steel as a raw material is demonstrated.
In the following description, an example of manufacturing an L-shaped structural member that is bent so that the web portions are perpendicular to each other is introduced, but the angle formed by the web portion may be an acute angle or an obtuse angle. That is, assuming that an angle formed by virtual lines l ₂ and l ₃ described below is a predetermined angle, (180 degrees−predetermined angle) is the web portion intersection angle. In other words, the virtual lines l ₂ and l ₃ may be drawn so as to intersect at an angle of (180 degrees−web portion desired intersection angle) according to the desired web portion intersection angle.

There are no restrictions on the channel steel as a material. The same shape steel 7 as that used in the conventional method as shown in FIG. 2 is used (see FIG. 3A). However, similar to that used in the conventional method, in the grooved steel used in the present invention, twice the flange width must not exceed the web width.
Instead of forming the notches used in the conventional method, a bending line is assumed. As shown in FIG. 3 (b), on the outer surface of both flange portions of the material grooved steel, a straight line l ₁ perpendicular to the longitudinal direction of the material grooved steel, the intersection of the flange portion and the web portion, and the longitudinal direction Two straight lines l ₂ and l ₃ extending in the direction of 45 degrees with respect to the virtual line l ₁ from the point where the straight line perpendicular to the line intersects are temporarily drawn. The imaginary lines l ₂ and l ₃ are preferably drawn so as to extend in the direction of 45 degrees with respect to the imaginary line l ₁ . As described above, when the intersecting angle between the imaginary lines l ₂ and l ₃ deviates from 90 degrees, the web angle of the manufactured L-shaped structural member does not become a right angle.

Next, both flange portions are bent along the imaginary lines l ₁ , l ₂ and l ₃ . That is, as shown in FIG. 3 (c), the imaginary line l ₁ is a trough, the imaginary lines l ₂ and l ₃ are crests, and the phantom line is sharply directed toward the inside of the material grooved steel at the flange portion. Fold until l ₂ and l ₃ contact each other. At this time, the web portion is also naturally bent toward the flange portion forming side, and an L-shaped structural member is obtained that is bent until the web portions are orthogonal to each other (see FIG. 3D).
In the above aspect, the imaginary lines l ₂ and l ₃ that are peaks at the time of folding are drawn so as to extend in a direction of 45 degrees with respect to the imaginary line l ₁ , but the present invention is not limited to this aspect. As described above, it is sufficient to draw so that the angle at which the imaginary lines l ₂ and l ₃ intersect is 90 degrees. At this time, the imaginary line that becomes a valley at the time of folding does not coincide with a straight line perpendicular to the longitudinal direction of the material grooved steel. This is a line extending in a direction that bisects the angle at which the imaginary lines l ₂ and l ₃ intersect.
The processing method when using angle steel is the same.

In order to smoothly perform such bending and obtain an L-shaped structural member having excellent molding accuracy, it is preferable to use a mold.
Therefore, a preferable mold shape and a molding method using the mold will be described next.
As shown in FIG. 4, the mold applied to the present invention includes a bending punch 11, a pair of left and right preliminary bending punches 12, and a pair of front and rear rotating dies 13.
The bending punch 11 is formed with a V-groove so that the grooved steel can be bent at a predetermined angle, and is preferably slightly wider than the grooved steel. In this processing method, since the channel steel slides on the punch shoulder, there is a concern about appearance defects due to galling or the like. In order to prevent galling or the like, it is desirable to leave an appropriate radius on the shoulder portion of the punch.

The preliminary bending punch 12 has a shape that undergoes preliminary bending along the virtual lines l ₂ and l ₃ . The shape of the pre-bending punch is a triangular pyramid whose apex is the intersection of the bending line portion of the flange and the open end of the flange, and it is desirable that each corner portion has an R. It is desirable for the rotary die 13 to have a clearance equal to or greater than the plate thickness.
The pair of front and rear rotating dies 13 that are rotated by pressing the bending punch 11 have a taper on the bending line side so that the dies do not contact each other after processing. Further, it is desirable that the width of the rotary die 13 is slightly narrower than the width of the flange of the workpiece. It is desirable that the die has a clearance larger than the plate thickness so that the folded flange after processing does not deform.

A method of processing the channel steel using this mold will be described.
The mold used for manufacturing the L-shaped structural member is a pair of front and rear rotary dies 13 on which a workpiece is placed, a bending punch 11 placed on the top of the rotary die 13 and left and right sides arranged on the side of the rotary die 13. It comprises a pair of preliminary bending punches 12.
First, the workpiece 8 is installed on the pair of rotary dies 13 whose upper surfaces are horizontal so that the bending position is between the rotary dies 13 (FIG. 5A). The pre-bending punch 12 is pressed from both sides of the workpiece 8 installed, and pre-bending is performed on both sides of the flange (FIG. 5B). This pre-bending process is performed to preferentially buckle the flange when the workpiece 8 is bent into an L-shape and adjust the angle of the L-shaped structural member, and the flange breaks. It is preferable to carry out with a deformation amount that does not occur.
After preliminary bending, the preliminary bending punch is released from both sides.

After the preliminary bending process, a bending punch 11 having a V-groove having a predetermined angle is pushed in from above the workpiece 8 placed on the rotary die 13 (FIG. 5C). At this time, the rotating die 13 rotates in the circumferential direction along the V groove of the bending punch 11 and bending is performed so that both flanges are folded. The folded flange is molded so as to be sandwiched by the taper portion of the rotary die 13 (FIG. 5D).
After bending, the bending punch 11 is returned upward, and the L-shaped structural member 9 is taken out.

The L-shaped structural member manufactured by the method of the present invention is folded until the folding imaginary lines l ₂ and l ₃ come into contact with each other with the folded portion. Therefore, the strength reduction caused by the shift of the flange notch end that occurs when the notch is formed cannot occur. In addition, the strength against deformation is higher than the conventional L-shaped structural member due to the work hardening of the folding flange portion. Therefore, a high-strength L-shaped structural member can be stably obtained at a low cost.
When higher rigidity is required, the folded flange portion may be mechanically joined by caulking, rivet joining, or the like, or the bending line portion or the folded flange portion may be welded joined.

The processing method in the case where the material is angle steel is basically the same as that in the case of channel steel.
The workpiece 14 is placed on the pair of rotary dies 13 whose upper surfaces are horizontal so that the bending position is between the rotary dies 13 (FIG. 6A). A pre-bending punch 15 is pressed from the side of the installed workpiece 14 to perform a pre-bending on one side 16 of the angle steel (FIG. 6B).
After the pre-bending process, remove the pre-bending punch.

After the preliminary bending process, a bending punch 11 having a V-groove having a predetermined angle is pushed in from above the workpiece 14 placed on the rotary die 13 (FIG. 6C). At this time, the rotating die 13 rotates in the circumferential direction along the V groove of the bending punch 11, and bending is performed so that the other side of the angle steel is folded. The folded side is formed so as to be sandwiched by the taper portion of the rotary die 13 (FIG. 6D). When bending one side 16 of the angle steel and then bending the other side, it is necessary to prevent the angle steel from curling by using the flange presser 17.
After bending, the bending punch 11 is returned upward, and the L-shaped structural member 18 is taken out.

As described above, according to the method of the present invention, a high-strength L-shaped structural member made of channel steel or angle steel can be stably obtained at low cost.
And, by applying the bending method to the L-shape according to the present invention a plurality of times to one grooved steel or angle steel, a high-strength U-shaped structural member and a R-shaped structural member can be stably produced at low cost. Can be manufactured. That is, when the L-shaped bending method according to the present invention is applied twice to one grooved steel or angle steel, the U-shaped structural member is applied to one grooved steel or angle steel three times, The mold structure member can be manufactured stably at a low cost.
Therefore, according to the method of the present invention, a high-strength home appliance housing, a pallet face material, a non-bearing wall frame of a house, or the like can be stably provided at low cost.

The figure explaining the structure of the L-shaped structural member which fitted the edge part of channel steel The figure explaining the L-shaped structural member manufacturing method which combined notch formation and welding The conceptual diagram explaining the manufacturing method of the L-shaped structure member of this invention The figure explaining the shape of the metallic mold used for the method of the present invention The figure explaining the method of manufacturing the L-shaped structural member which made the grooved steel the raw material using a metal mold | die The figure explaining the method of manufacturing the L-shaped structural member which made angle steel the raw material using a metal mold

Claims (2)

A method of manufacturing an L-shaped structural member using a channel steel as a raw material, wherein a preforming punch is applied to the flange portion of the material channel steel from both sides, and the flange direction of the material channel steel and the longitudinal direction of the channel steel A pre-bending process is performed on the flange portion by vertically pressing a conical surface intersection portion of the triangular pyramid action portion of the pre-bending punch whose action portion is a triangular pyramid to a line of the flange portion where the surface perpendicular to the surface intersects. After that, the web part of the material grooved steel is pressed by a bending punch whose action part has a V-groove shape, and the line of intersection of the flange part and the web part of the material grooved steel intersects the line of the flange part. The two straight lines that form the ridges are formed on the two flange parts that have been subjected to the pre-bending process of the grooved steel with two straight lines that extend in the direction of 45 ° to the flange line from the point. Fold it inside the channel steel until it touches each other, Method for producing L-shaped structural member, characterized in that bent flange portion formation side. A method of manufacturing an L-shaped structural member made of angle steel, comprising a preform punch on one side of the material angle steel, and a surface perpendicular to one side of the material angle steel and the longitudinal direction of the angle steel The pre-bending process is performed on the one side by vertically pressing the conical surface intersection of the triangular pyramid working portion of the pre-bending punch whose working portion is a triangular pyramid to the line of the one side intersecting with The other side of the angle iron is pressed with a bending punch whose action portion has a V-groove shape, and the one side from the point where the line of intersection of the two sides of the material angle steel intersects the line of the one side. Two straight lines extending in the direction of 45 ° with respect to the line of the side of the side of the angled steel, and one side of the angle steel that has been subjected to the pre-bending process, until the two straight lines that form the peak contact each other Fold to the other side of the angle steel and fold the other side of the angle steel to the one side forming side Method for producing L-shaped structural member, characterized in Rukoto.

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