JP6401729B2 - L-shaped structural member manufacturing method and L-shaped structural member - Google Patents

Description

  The present invention is an L-shaped material made of a shape steel such as a grooved steel or an angle steel, such as a structural material forming an outer wall frame for a prefabricated house, or a mounting bracket used for attaching an outer wall panel to a beam or the like. The present invention relates to a method for manufacturing a mold structure member and an L-shaped structure member.

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 then fitted to the other end to secure both channel steel using welding, rivet joining, caulking, etc. doing. In FIG. 1, 4 is a rivet.
In addition, as shown in FIG. 2, it is also proposed that the flange portion 5a of the grooved steel 5 is bent by inserting a 90 ° cutout 6 into the flange portion 5a and then welded to manufacture the flange portion 5a. ing.

  In Patent Document 1, 2 extending in the direction of 90 degrees from the point where the intersecting line 8c of the flange portion 8a of the grooved steel 7A and the web portion 8b intersects the straight line 8d extending in the short direction of the grooved steel 7A. Two flanges 8a of the grooved steel 7A are buckled on the inside of the grooved steel 7A until the two straight lines 8e forming the peaks contact each other with the two straight lines 8e as a mountain. Then, the web portion 8b is bent at a right angle with the straight line 8d as a fold line. Thereby, the L-shaped structural member 7 as shown in FIG. 3 is manufactured without welding.

JP 2009-167787 A

  However, in order to manufacture an 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. Further, when the welding method is employed, there is a problem that the working environment is deteriorated because fume is generated.

  In the method shown in FIG. 2, when the end portions of the notches 6 of the flange portion 5a are brought into contact with each other, the abutting surfaces are easily displaced, and as a result of the displacement, the strength becomes unstable. Therefore, in order to eliminate the deviation and stably develop the required strength, the butted portions are welded together. This method also takes time and effort as much as the notch is made, and in the case of welding, plating disappears due to heat and strain, leading to deterioration of the working environment. In addition, it is necessary to finish or repair the weld.

  In the manufacturing method which does not require the welding operation shown in FIG. 3, the load in the direction in which the bent and buckled flange portion 8a is closed (the direction in which the bending angle of the L-shaped structural member 7 is reduced) Has strength. However, sufficient strength cannot be obtained with respect to the load in the direction in which the buckled flange portion 8a opens (the direction in which the bending angle of the L-shaped structural member 7 increases).

  In addition, L-shaped structural members used for home appliance frames and the like are mainly formed from angle steel. Even when an L-shaped structural member is manufactured by bending an angle steel, there are the same problems as when a grooved steel is used as a raw material.

  The present invention has been devised to solve such problems, and is made of a shape steel such as a grooved steel or an angle steel, has a predetermined strength, and is manufactured simply and without deteriorating the working environment. An object of the present invention is to provide an L-shaped structural member manufacturing method and an L-shaped structural member.

  The present invention relates to a structural steel having a web portion extending in the longitudinal direction and a flange portion provided along at least one of the side sides extending in the longitudinal direction of the web portion. A method of manufacturing an L-shaped structural member formed by being bent along a first straight line extending in the direction of the flange portion at a predetermined angle from the intersection of the side and the first straight line when bent. The buckling portion is formed by buckling the portion between the two straight lines toward the web portion side with the two straight lines extending in the direction forming the buckling, and the formed buckling portion is connected to the flange. It is a manufacturing method of the L-shaped structural member bent in the direction along the inner surface of a part.

  The folding angle with the first straight line as the fold point may be 90 degrees.

  The section steel may be channel steel.

  The section steel may be an angle steel.

  The present invention also provides a section steel having a web portion extending in the longitudinal direction and a flange portion provided along at least one of the side sides extending in the longitudinal direction of the web portion. An L-shaped structural member formed by being bent along a first straight line extending in the hand direction, and at the time of bending, the flange portion has a predetermined angle from the intersection of the side and the first straight line. A buckling portion formed on the web portion side with two straight lines extending in a direction formed as a buckling starting point being bent in a direction along the inner surface of the flange portion.

  According to the present invention, a manufacturing method and an L-shaped structure of an L-shaped structural member that is made of a shape steel such as a grooved steel and an angle steel, has a predetermined strength, can be manufactured easily and without deteriorating the working environment. A member can be provided.

It is a figure explaining the structure of the L-shaped structural member formed by fitting the edge parts of two channel steels in a prior art. It is a figure explaining the manufacturing method of the L-shaped structural member formed combining notch formation and welding in a prior art. It is a perspective view of the L-shaped structural member in a prior art. It is a perspective view of the L-shaped structure member of a 1st embodiment. It is a figure explaining the outline | summary of the manufacturing method of an L-shaped structural member. It is a figure which shows the whole L-shaped bending apparatus. It is a figure which shows a bending apparatus. It is the figure which showed the process of performing to the state of FIG.5 (d) using an L-shaped bending apparatus. It is the figure which showed the process of bend | folding the state of FIG.5 (d) like FIG.5 (e) using a bending apparatus. It is the figure which showed the process performed until it folds an angle iron into L shape using the L-shaped bending apparatus of 2nd Embodiment. It is the figure which showed the process of bending the buckling part in the angle iron bent by the L shape using the bending apparatus of 2nd Embodiment.

(First embodiment)
Hereinafter, the manufacturing method of the L-shaped structural member 10 and the L-shaped structural member 10 according to the first embodiment of the present invention will be described. The first embodiment relates to a method of manufacturing the L-shaped structural member 10 by bending the groove steel 10A and the L-shaped structural member 10 manufactured by bending the groove steel 10A. FIG. 4 is a perspective view of the L-shaped structural member 10 of the first embodiment. FIG. 5 is a diagram for explaining the outline of the manufacturing method of the L-shaped structural member 10.

As shown in FIG. 5A, the grooved steel 10A that is the material of the L-shaped structural member 10 is formed by extending a plate-like member extending in the longitudinal direction along two straight lines (intersection line L2) extending in the longitudinal direction. It is bent and formed into a U-shaped cross section.
The grooved steel 10 </ b> A includes a web portion 12 extending in the longitudinal direction, and flange portions 13 that are provided at substantially right angles to the web portion 12 on both sides of the web portion 12 and extend in the longitudinal direction in the same manner as the web portion 12. . In addition, it is preferable that twice the width of the flange portion 13 does not exceed the width of the web portion 12. This is because the buckling portions 14 on both sides may come into contact with each other when the later-described buckling portions 14 are formed.

When the grooved steel 10A is bent into an L-shape to form the L-shaped structural member 10, the web portion 12 is bent along a first straight line L1 extending in the short direction. At this time, the flange portion 13 has two imaginary lines (straight lines) l ₂ and l ₃ extending in a direction forming a predetermined angle α from a point P where the intersecting line L2 with the web portion 12 and the first straight line L1 intersect. (see FIG. 5 (b) and shown in (c)) until the imaginary line l ₂ and l ₃ are contact with each other as a seat屈起point, or folded to close.

At this time, as shown in FIG. 5 (c), imaginary lines _{l 1} valley, imaginary lines _{l 2} and _{l 3} is a mountain. A portion between the _two imaginary lines l ₂ and l ₃ is buckled inside the grooved steel 10 </ _b > A to form a buckled portion 14. The web portion 12 is bent until both sides of the web portion 12 across the first straight line L1 are orthogonal to each other.

The imaginary lines l ₂ and l ₃ are straight lines extending from the point P in the direction of 45 degrees in the embodiment with respect to the imaginary line l ₁ perpendicular to the longitudinal direction of the grooved steel 10A. That is, the angle α formed by the virtual lines l ₂ and l ₃ is 90 degrees. An angle obtained by subtracting α (90 degrees) that is an angle formed by the imaginary lines l ₂ and l ₃ from 180 degrees is a bending angle θ (90 degrees) of the L-shaped structural member 10.
Note that the angle α formed by the virtual lines l ₂ and l ₃ is not limited to 90 degrees. When the angle α is another angle, the angle obtained by subtracting α from 180 degrees is the bending angle θ of the L-shaped structural member 10.

In other words, according to the desired bending angle θ of the L-shaped structural member 10, the imaginary lines l ₂ and l ₃ are such that the angle α is an angle obtained by subtracting the desired bending angle θ from 180 degrees. The L-shaped structural member 10 can be set to a desired bending angle θ.

When the angle α between the virtual lines l ₂ and l ₃ is other than 90 degrees, the bending angle θ of the manufactured L-shaped structural member 10 does not become a right angle.

Here, when the buckling until the virtual line l ₂ and l ₃ as described above to abut one another, as shown in FIG. 5 (d), buckling 14 protrudes inward.
The buckling portion 14 is bent in a direction along the inner surface of the flange portion 13 as shown in FIG. At this time, it is preferable that the flange portion 13 is sufficiently adhered to the inner surface. The direction of bending the buckling portions 14 of the flange portions 13 on both sides is not limited, and the flange portions 13 on both sides may be bent in the same direction or in different directions.

(Manufacturing equipment 20, 30)
Next, an apparatus for manufacturing the L-shaped structural member 10 of the embodiment will be described. In the present embodiment, the L-shaped bending device 20 and the bending device 30 which are molds are used.
FIG. 6 is a diagram illustrating the entire L-shaped bending device 20. FIG. 7 is a view showing the bending apparatus 30. FIG. 8 is a diagram showing a process of performing the process up to the state of FIG. 5D using the L-shaped bending device 20, and FIG. 9 shows the process from the state of FIG. 5D using the bending device 30. It is the figure which showed the process of bending the bending part 14 like FIG.5 (e).

(L-shaped bending device 20)
As shown in FIG. 6, the L-shaped bending device 20 is disposed on a pair of rotating dies 23 disposed in the longitudinal direction in order to place the channel steel 10 </ b> A, and on the left and right (side) of the rotating die 23. A pair of preliminary bending punches 22 and a bending punch 21 disposed on the upper portion of the rotary die 23 are provided.

  As shown in FIGS. 6 and 8, for the sake of explanation, when the grooved steel 10 </ b> A is processed in the L-shaped bending apparatus 20, the longitudinal direction of the web portion 12 is defined as the longitudinal direction and the lateral direction. Is the left and right, and the direction perpendicular to them is the up and down.

(Rotating die 23)
The pair of rotating dies 23 includes a rotating die 23A disposed on the front side and a rotating die 23B disposed on the rear side with the first straight line L1 serving as a folding line of the web portion 12 of the channel steel 10A interposed therebetween.
Each of the rotary dies 23 has a tapered portion 24 having a shape such that a portion including one side extending in the left and right direction in the lower portion of the rectangular parallelepiped member is cut. The angle β of the tapered portion 24 is about 45 degrees. The upper surface of the rotary die 23 is rectangular, the lower surface is a rectangle whose front and rear lengths are smaller than the upper surface, and the left and right side surfaces are trapezoidal.
The front rotating die 23A is provided with a taper portion 24A on the rear surface, and the rear rotating die 23B is provided with a taper portion 24B on the front surface.
The width in the left-right direction of the rotary die 23 is slightly narrower than the width in the left-right direction of the web portion 12 of the channel steel 10A. Therefore, as shown in FIG. 8, the rotary die 23 can be arranged inside the U-shaped opening side of the channel steel 10A.

(Preliminary bending punch 22)
Each of the pair of pre-bending punches 22 has a hexahedral shape in which a triangular pyramid is coupled to one of the surfaces of a right triangle in a right triangular prism. Two sides (two sides sandwiching the right angle of the right triangle) that are the bases of the triangular pyramid are sides m ₂ and m ₃ for forming virtual lines l ₂ and l ₃ . The side m ₁ extending between the sides m ₂ and m ₃ from the vertex of the right triangle forms an imaginary line l ₁ . Note that it is desirable to form an R shape at each corner (each side) of the pre-bending punch 22.

(Bending punch 21)
The bending punch 21 has a shape in which a V-groove 21A is formed in the lower part of a rectangular member. The width (left and right width) of the bending punch 21 is preferably slightly larger than the width of the web portion 12 of the channel steel 10A. In order to prevent appearance defects due to galling or the like, it is desirable to leave an appropriate R at the punch shoulder portion which is the corner portion of the V groove 21A.

(Bending device 30)
The bending device 30 is a mold that bends the buckling portion 14 protruding toward the inner surface side of the flange portion 13 so as to be parallel to the inner surface of the flange portion 13 and follows the inner surface side of the flange portion 13.
As shown in FIGS. 7 and 9, the bending device 30 deforms the constraining mold 33 that restrains the outer surface of the flange portion 13 and the outer surface of the web portion 12 and the buckling portion 14 along the inside of the flange. And a punch 34.
The constraining mold 33 is a U-shaped member having a rectangular parallelepiped member provided with a groove portion 36 having a width substantially the same as the lateral width of the grooved steel 10A.
The punch 34 is formed in a rectangular parallelepiped shape in which a notch portion 35 for accommodating the buckling portion 14 is formed on the distal end side of the pair of side surfaces. The punch 34 is configured to be slidable in the groove 36. The cutout portion 35 has a size that can accommodate the buckled portion 14 that is bent along the inside of the flange portion 13.
In order to suppress galling or the like, it is desirable to leave an appropriate R at the corner (punch shoulder) of the portion of the punch 34 where the notch 35 is formed.

(Production method)
(Rotating die placement)
The manufacturing method which manufactures the L-shaped structural member 10 using the above-mentioned L-shaped bending apparatus 20 and the bending apparatus 30 is demonstrated.
As shown in FIG. 8A, the pair of rotating dies 23 are arranged so that the taper portions 24 face each other such that their upper surfaces are horizontal to each other.
At this time, a gap larger than the plate thickness of the flange portion 13 is provided between the tapered portion 24A of the rotating die 23A and the tapered portion 24B of the rotating die 23B so that the buckled portion 14 after processing is not deformed. .

  On the pair of rotary dies 23, the grooved steel 10 </ b> A is disposed with the U-shaped opening facing the rotary die 23. At this time, the first straight line L1, which is a bending position, is positioned between the rotary die 23A and the rotary die 23B.

(Preliminary bending)
A pair of pre-bending punch 22, sides m ₁ is then to come to the position of the first straight line L1, the left and right flange portions 13 of Mizokatachiko 10A, cone portions to each other are arranged so as to face. The clearance with respect to the slope of the pre-bending punch 22 and the taper portion 24 of the rotary die 23 is equal to or greater than the thickness of the channel steel 10A.
In this state, the pair of preliminary bending punches 22 is moved in a direction in which they are close to each other, and the preliminary bending punches 22 are pressed against the flange portion 13. Thereby, a pre-bending process is given to the flange part 13 (FIG.8 (b)).
In the preliminary bending process, a valley portion along the imaginary line l ₁ is formed in the flange portion 13, and a mountain portion along the imaginary lines l ₂ and l ₃ is formed.
The preliminary bending process is performed to preferentially buckle the flange when the workpiece 16 is bent into an L shape, and to adjust the angle of the L-shaped structural member 10. It is preferable to carry out with a deformation amount such that 13 does not break.
After the preliminary bending process, the preliminary bending punch 22 is separated from the flange portion 13.

(Bending punch arrangement)
As shown in FIG. 8C, after the preliminary bending process, the bending punch 21 is disposed on the rotary die 23 and the grooved steel 10A so that the V-groove 21A faces the grooved steel 10A. At this time, the rear part (V corner) of the V groove 21A of the bending punch 21 is positioned on the first straight line L1.

(Bending punch press)
As shown in FIG. 8D, the bending punch 21 is moved in a direction relatively approaching the grooved steel 10A, and the bending punch 21 is pushed into the grooved steel 10A from above.
At this time, both rotary dies 23 rotate around the central portion (punch shoulder) of the V-groove 21 </ b> A along the V-groove 21 </ b> A of the bending punch 21. Along with this, a portion between l ₂ and l ₃ of both flange portions is folded and buckled.
Thus, the buckling portion 14, which is a portion between l ₂ and l ₃ , is formed so as to be sandwiched by the taper portion 24 of the rotary die 23. At this time, since the pair of rotating dies 23 have the tapered portion 24 as described above, they do not contact each other even after rotation.

  After bending, the bending punch 21 is raised and the L-shaped structural member 10 is taken out. In this state, the buckling portions 14 of both flange portions 13 protrude toward the web portion 12 with respect to the flange portion 13 as shown in FIG.

Next, the folded channel steel 10A is installed in the groove 36 of the restraining mold 33 of the folding device 30 shown in FIGS. Then, as shown in FIG. 9A, the punch 34 is lowered inside the flange portion 13 of the channel steel 10A. When the punch 34 is lowered, as shown in FIG. 9B, the buckling portion 14 protruding inside the flange portion 13 is bent along the inner surface of the flange portion 13, and the bent buckling portion 14 is The bent punch 21 is housed in the notch 35.
After the folding of the buckling portion 14 by the bending punch 21 is completed, the bending punch 21 is raised as shown in FIG. 9C, and the completed L-shaped structural member 10 is taken out.
As described above, the L-shaped structural member 10 shown in FIG. 4 is manufactured.

The L-shaped structural member 10 manufactured according to the present embodiment is bent so that the buckling portion 14 is along the inner surface of the flange portion 13. In the state of FIG. 5D before bending, as shown by the arrow in the drawing, when a force is applied in the direction in which the bending angle θ of the L-shaped structural member 10 is widened, the force is applied to the buckling portion 14. It works vertically, and the bending angle θ of the L-shaped structural member 10 tends to spread.
However, in the state of FIG. 5 (e) after being bent, as indicated by an arrow in the drawing, the force acts in parallel with the buckling portion 14, and the bending angle θ of the L-shaped structural member 10 is difficult to spread. . Therefore, the strength of the L-shaped structural member 10 is improved.

  Moreover, the L-shaped structural member 10 manufactured by this embodiment is formed in an L shape by buckling the flange portion 13 without forming a notch. Therefore, unlike the prior art shown in FIG. 2, there is no reduction in strength due to the flange notch end shift that occurs when the notch is formed.

Therefore, the high-strength L-shaped structural member 10 can be obtained at low cost.
When higher rigidity is required, the folded flange portion 13 bent along the inner surface of the flange may be mechanically joined by caulking, rivet joining, etc. The flange portion 13 may be welded.

  In the present embodiment, since the mold is used in manufacturing the L-shaped structural member 10, uniform manufacturing can be easily performed. Moreover, the L-shaped structural member 10 excellent in shape accuracy and strength can be manufactured.

In addition, by using the method of bending the L-shape according to the present invention by applying it to a single grooved steel 10A or a later-described angle-shaped steel a plurality of times, the U-shaped structural member and the R-shaped structural member are also low in cost. And it can manufacture stably.
That is, by applying the L-shaped bending method according to the present invention twice to one grooved steel 10A or angle steel, the U-shaped structural member is applied three times to one grooved steel 10A or angle steel. A character-shaped structural member can be manufactured stably at low cost.
Therefore, according to the present invention, a structural member made of steel such as a prefabricated housing outer wall frame, a non-bearing wall frame of a house, and a member that requires strength such as a home frame or a pallet face material can be stably manufactured at low cost. Will be able to supply. Therefore, it leads to the expansion of the application range to the housing-related member of steel materials, the housing | casing of a high intensity | strength household appliance, etc.

(Second Embodiment)
The second embodiment relates to a method of manufacturing the L-shaped structural member 110 by bending the angle steel 110A and the L-shaped structural member 110 manufactured by bending the angle steel 110A.
FIG. 10 corresponds to FIG. 8 and is a view showing a process of performing the process until the angle steel 110A is bent into an L shape using the L-shaped bending apparatus of the second embodiment.
FIG. 11 corresponds to FIG. 9 and shows a step of bending the buckling portion 114 of the angle steel 110A bent into an L shape using the bending device 130 of the second embodiment.
The second embodiment differs from the first embodiment in that the material of the L-shaped structural member 110 is an angle steel 110A, and accordingly, the left and right widths of the rotary die 123 of the L-shaped bending device 120 are webs. A point wider than the part 112, a point provided with a holding part 125 for holding the flange part 113 from the opposite side of the rotary die 123, and a point that there is one pre-bending punch 122 for drawing a virtual line. The other parts are the same and will not be described.

The manufacturing method of the second embodiment is substantially the same as that of the first embodiment. The difference is as shown in FIG. When the angle steel 11 is held on the rotary die 123, the holding portion 125 is arranged so that the flange portion 113 is held from the opposite side of the rotary die 123. Since other manufacturing processes are the same as those in the first embodiment, description thereof is omitted.
According to the second embodiment, it is possible to manufacture the L-shaped structural member 110 in which the buckling portion 114 is bent along the flange portion 113 as shown in FIG. . FIG. 11D shows an L-shaped structural member 110 manufactured from the angle steel 110A.
The L-shaped structural member 110 of the second embodiment also has the same effect as the L-shaped structural member 10 of the first embodiment.

L1 1st straight line l ₁ imaginary line l ₂ imaginary line (straight line)
l ₃ virtual lines (straight line)
10 L-shaped structural member 10A Channel steel (section steel)
DESCRIPTION OF SYMBOLS 12 Web part 13 Flange part 14 Buckling part 16 Work material 20 L-shaped bending apparatus 21 Punch 21A Groove 22 Punch 23 Rotating die 24 Taper part 28 Heisei 30 Bending apparatus 33 Restraint metal mold 34 Punch 35 Notch part 36 Groove part 110 L-shape Mold structural member 110A Angle steel (section steel)
112 Web portion 113 Flange portion 114 Buckling portion 120 Device 122 Punch 123 Rotating die 125 Holding portion 130 Bending device

Claims (5)

A shape steel having a web portion extending in the longitudinal direction and a flange portion provided along at least one of the side sides extending in the longitudinal direction of the web portion is a first shape extending in the short direction of the shape steel. A method of manufacturing an L-shaped structural member formed by bending along a straight line,
When bending, on the flange portion, two straight lines extending in a direction forming a predetermined angle from the intersection of the side and the first straight line are used as buckling starting points, and the portion between the two straight lines is Buckling the web part side to form a buckled part,
Bending the formed buckled portion in a direction along the inner surface of the flange portion;
Manufacturing method of L-shaped structural member. The bending angle with the first straight line as a fold point is 90 degrees,
The manufacturing method of the L-shaped structure member of Claim 1. The shape steel is channel steel,
The manufacturing method of the L-shaped structure member of Claim 1 or 2. The shape steel is an angle steel.
The manufacturing method of the L-shaped structure member of Claim 1 or 2. A shape steel having a web portion extending in the longitudinal direction and a flange portion provided along at least one of the side sides extending in the longitudinal direction of the web portion is a first shape extending in the short direction of the shape steel. An L-shaped structural member formed by bending along a straight line,
When bending, a buckling portion formed on the web portion side at the flange portion with two straight lines extending in a direction forming a predetermined angle from the intersection of the side and the first straight line as a starting point. , Bent in a direction along the inner surface of the flange portion,
L-shaped structural member.

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