JPH09323127A - Method for bending steel and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute bending for bending an equal angle on a plane orthogonally crossed with the of symmetry axis of its V-shaped cross section by using not a conventional hot bending method but a roll train. SOLUTION: Bending action is executed by rotating main rolls 3 which are zigzag arranged in the longitudinal direction of an angle in the state where the main rolls are alternately brought into contact with one outside face of the angle 1. By bringing a press roll 7 which is arranged pairing with the main roll 3 into contact with the inner side faces and rotating it while pressing the angle 1 toward the main roll 3, the upward movement of the angle is suppressed. Simultaneously, by bringing a buckling preventing roll 9 which is arranged pairing with the press roll 7 into contact with the one opposite outside face of the angle 1 and rotating it while pressing the angle 1 toward the press roll 7, buckling is prevented. Furthermore, prevention of torsion is improved by guiding and holding the angle 1 by torsion preventing/guiding means which are provided on the outlet and inlet sides of the angle 1 to the main roll 3 train.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to bending of a metal material, and more particularly to a method of bending a steel material having a cross section having a single axis of symmetry, such as angle steel, in a plane orthogonal to the axis of symmetry. And the device.

[0002]

2. Description of the Related Art Conventionally, in order to bend a steel material such as an H-section steel, main rolls 51A and 51B as shown in FIG. 11 are arranged in a staggered manner and rotated while alternately contacting one outer surface of the steel material 53, I was doing a bending motion. At this time, the inner side of H of the H-section steel is pressed by the auxiliary roll 55 toward the main roll 51A. Such bending is possible because, for example, this H-shaped steel has a cross section having two symmetrical axes, that is, left and right and up and down in the figure, so that problems such as buckling and twisting are unlikely to occur.

On the other hand, the angle steel shown in FIG.
Bending in the vertical plane in the figure is relatively easy, and bending by a roll as shown in FIG. 11 has been performed conventionally, but bending in the horizontal plane in the figure must be done by bending as shown in FIG. I can't. The reason is that there is a defect that the angle steel moves in the vertical direction, buckling occurs on the inner side of the bending of the V shape of the angle steel, and the angle steel is twisted. Is. Such a problem occurs not only in the angle steel but also in other steel materials having only one symmetry axis in the cross section (see FIG. 10).

Conventionally, the angle steel has been bent by the so-called bending method. That is, intermittently in the longitudinal direction of the angle iron, the local portion 57 (FIG.
2), heating and cooling are repeated.

[0005]

In the conventional baking method, the bending is not uniform and the bending accuracy is poor. The cross-sectional shape changes easily due to bending, and correction is required. heating,
The material of the cooling part changes. There are problems that the work efficiency is extremely poor and that skill is required. The present invention
In order to solve the above problems, a bending process of bending a long steel material having a cross-sectional shape that can be fitted to each other in the direction of a single axis of symmetry in a plane orthogonal to the axis of symmetry, using a roll row instead of the bending method It is an object to provide a method and a device.

[0006]

[Means for Solving the Problems] In order to achieve the above objects, the inventors have made the following inventions. A first aspect of the present invention is a bending method for bending a long steel material having a cross section having only one axis of symmetry and having a cross-sectional shape that can be fitted to each other in the direction of the axis of symmetry in a plane orthogonal to the axis of symmetry. , The main rolls arranged in a zigzag in the longitudinal direction of the steel material rotate and bend while being alternately in contact with one outer surface of the steel material, and the pressing rolls arranged in pairs with the main roll are Rotates while pressing the steel material toward the main roll in contact with the side surface, and at the same time, the buckling prevention roll arranged in pairs with the pressing roll contacts the outer side of the steel material opposite to the main roll and presses the steel material. A method for bending a steel material, characterized in that a twist-preventing guide roll provided on the exit side and the entry side of the steel material with respect to the main roll row is pressed and rotated toward the roll to sandwich and guide the angle steel.

A second aspect of the present invention is a method of bending a steel material, characterized in that twist preventing guide means further provided on the outlet side and the inlet side of the steel material with respect to the main roll row sandwich and guide the steel material. .

A third invention is a method for bending a steel material, wherein the steel material is an angle steel.

According to a fourth aspect of the present invention, a long steel material having a cross section having only one axis of symmetry and having cross-sectional shapes that can be fitted to each other in the direction of the axis of symmetry is bent in a plane orthogonal to the axis of symmetry. In the processing method, a pair of steel members are butted against each other in their cross sections, and the butting is performed by overlapping the symmetry axes of the cross sections by changing the direction by 180 degrees, temporarily fixing the two, and feeding them into a main roll row staggered in the longitudinal direction of the steel materials. The method for bending a steel material is characterized in that the main roll is rotated in a state of alternately contacting one outer surface of the steel material to perform a bending operation, and then the temporary fixing of both is removed.

A fifth invention is a method for bending a steel material, wherein the steel material is an angle steel.

According to a sixth aspect of the present invention, a long steel material having a cross section having only one axis of symmetry and having cross-sectional shapes that can be fitted to each other in the direction of the axis of symmetry is bent in a plane orthogonal to the axis of symmetry. In the processing device, a plurality of main rolls arranged in a staggered manner in the longitudinal direction of the steel material and in contact with one side of the outer side, and arranged in pairs with the main roll, are formed in the same sectional shape as the sectional shape of the steel material, and contact the inner surface of the steel material. A plurality of pressing rolls for pressing the steel material toward the main roll, and a pair of pressing rolls arranged on the main roll located inside the bend of the plurality of main rolls are arranged to form a pair with the steel main roll. It is characterized by having a buckling prevention roll that contacts the outer surface on the opposite side and presses the steel material toward the pressing roll, and a twist prevention guide roll that is provided on the exit side and the entrance side of the steel material with respect to the main roll row. Of steel It is the lower processing equipment.

A seventh aspect of the invention is a bending apparatus for steel products, characterized in that twisting prevention guide means for the steel products are further provided on the exit side and the entrance side of the steel product with respect to the main roll row.

An eighth invention is an apparatus for bending a steel material, wherein the steel material is an angle steel.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

(One Embodiment) One embodiment of the present invention will be described with reference to FIGS.
Will be explained. In this embodiment, angle steel is used as a long steel material having a cross section having only one axis of symmetry and having cross-sectional shapes that can be fitted to each other in the direction of this axis of symmetry.

This angle steel is arranged around segment pieces which form a segment that covers the inside of a tunnel excavated by a shield method or the like, and is used for fitting adjacent segment pieces. That is, Yamagata V
By fitting the angle steel having the convex V-shaped cross section and the angle steel having the concave V-shaped cross section, the segment pieces can be easily connected.

Since the segment piece is curved with a predetermined curvature in accordance with the shape of the tunnel, it is necessary to perform bending processing in accordance with this curvature. In the drawing, the angle steel 1 is an equilateral angle steel (see FIGS. 2 to 4) and is bent in a horizontal plane in a V-shape with the axis of symmetry up and down. In the device into which the angle steel 1 is inserted, three main rolls 3A and 3B are arranged in a zigzag pattern in the longitudinal direction of the angle steel 1 (FIG. 1).

Each of the main rolls 3A and 3B has a trapezoidal cross section (FIGS. 2 and 3), rotates in contact with one outer surface of the angle steel 1, and exerts a bending force in a horizontal direction in a horizontal plane, Bend. The rotary shafts of the main rolls 3A and 3B are angle steel 1
Parallel to the axis of symmetry of the cross section of. The main rolls 3A and 3B are
In order to adjust the mutual distance so that the bending curvature and the like can be changed, they are movably supported by an adjusting mechanism (not shown).

Since the angle steel 1 has a V-shaped cross section and is vertically asymmetrical, and the main rolls 3A and 3B contacting each other have a truncated cone shape, the component of the bending force acts upward, and the material of the angle steel 1 is Lift up. In order to prevent this lifting phenomenon and the twisting of the material due to this phenomenon, a flange portion for restraining the lifting of the angle steel 1 by restraining both V-shaped tips of the angle steel 1 on the upper portions of the main rolls 3A, 3B. 5 is provided.

However, in some cases, the flange portion 5 alone cannot completely prevent the angle steel 1 from being lifted. For this reason, abacus bead-shaped pressing rolls 7A and 7B that are arranged in pairs with the main roll 3 and press the inner surface of the angle steel 1 from above are provided. The abacus bead shape has the same cross-sectional shape (the lower half cross-sectional shape in FIG. 2) as the space surrounded by the V-shaped cross section of the angle steel 1 and is in close contact with the inner surface of the angle steel 1. This is because.

As a result, the pressing rolls 7A and 7B function to press the angle steel 1 toward the main roll 3. The rotation axes of the press rolls 7A and 7B are parallel to the horizontal plane where the bending is performed. This rotating shaft can freely change its direction so that it can cope with the case where the bending curvature is changed, and therefore the presser rolls 7A and 7B are supported so as to be swingable.

Further, when the angle steel has a small wall thickness, the side of the V-shaped cross section located inside the bend may buckle due to compressive stress. In order to prevent this buckling, it is necessary to restrain the side of the V-shape that is located inside the bend so as not to be in a free state. In order to perform this constraint, the buckling prevention roll 9 is arranged corresponding to the pressing roll 7A.

The buckling prevention roll 9 functions to press the side of the V-shaped angle steel 1 located inside the bend toward the pressing roll 3A. The rotation axis of the buckling prevention roll 9 is in the same plane as the pressing roll 7A and intersects (FIG. 2).
Is arranged. Therefore, the rotation shaft of the buckling prevention roll 9 also swings as the pressing roll 7A swings.

In addition to the buckling prevention roll 9, a top 11 shown in FIG. 5 (A) may be provided in order to more completely restrain the side of the V-shaped portion located inside the bend. it can. That is, the buckling prevention roll 9 only restrains the chevron steel 1 in a narrow range (so to speak, in line contact), and there is a portion not restrained by the buckling prevention roll 9.
A top 11 is provided at that portion, and the side of the V-shape located inside the bend is restrained along the longitudinal direction of the angle steel 1.

The top 11 has an inner portion 11A having the same cross-sectional shape as the cross-sectional shape of the space surrounded by the V-shaped cross section of the angle steel 1, and V.
It has a jaw portion 11B that sandwiches the side of the character located inside the bend from the outside. Angle steel 1 for the main roll row
On the inlet side and the outlet side of the roll 13, for example, a roll 13 (FIG. 1, FIG.
(A)) is provided to further stabilize the pass line for feeding the angle steel 1 and to prevent the angle steel 1 from being twisted. As another embodiment of the top 11, the one shown in FIG. 5B may be used. In this case, it is sandwiched by the outer portion 11C instead of the jaw portion 11B.

(Operation) The main rolls 3A and 3B are the angle steel 1
Rotate while alternately contacting the outer one side of, and apply bending force in the horizontal direction to perform bending operation in the horizontal plane. That is, the main rolls 3A and 3B apply a bending force to the angle steel 1, and at the same time, by driving some of the plurality of main rolls 3A and 3B, a feed force is added to the angle steel 1 to form the angle steel 1.
It enables continuous bending of.

The presser rolls 7A and 7B are in close contact with the inner side surface of the angle steel 1 so that the angle steel 1 is fixed to the main rolls 3A and 3B.
The angle iron 1 is restrained in the vertical direction so that the angle steel 1 does not move in the vertical direction in the figure. Further, the V-shape of the angle steel 1 is maintained. That is, the presser roll 7
A and 7B stabilize the passage position of the angle steel 1 and
It also serves to prevent the cross-section deformation (angle change) of the angle steel 1 due to bending. Further, the restraint of the angle steel 1 in the vertical direction in the figure is also performed by restraining both ends of the V-shape of the angle steel 1 by the flange portion 5.

At the same time, the buckling prevention roll 9 is made of V-shaped angle steel.
The side of the character located inside the bend is rotated while pressing it toward the press roll 7A to prevent the material from escaping to the inside and prevent the side from buckling. This buckling is more completely prevented by the top 11 sandwiching the side between the inner portion 11A and the jaw portion 11B. Further, the twist prevention guide rolls 13 are provided on the leading side and the leading side of the main roll row at the angle steel 1
It is sandwiched and guided to prevent further twisting.

(Other Modifications) In the above embodiment, three main rolls 3 and pressing rolls 7 were provided, but in other modifications, four or more may be provided. Further, in the above embodiment, the bending is performed in the horizontal plane, but in another modification, it may be performed in the vertical plane. That is, it is possible to turn the angle of each roll in the above embodiment by 90 ° and bend the angle steel in the vertical plane.

Further, in the above embodiment, a pair of twist preventing guide rolls 13 for sandwiching and guiding the angle steel 1 are provided, and both have a cylindrical shape, and the V-shaped tips of the angle steel 1 are in point contact with each other at the lower end. It was to guide by touching (Fig. 4
(A)) In another modification, as shown in FIG. 4 (B), at least one (15B in this case) of the twist prevention guide rolls 15A, 15B provided in a pair has a cross section of the angle steel 1. It may have a shape adapted to, and so to speak, so to speak, may be a line contact. By forming a shape according to the cross section of the angle steel 1, the twist prevention guide roll 13
It is also possible to prevent the deviation of the above in the direction of the rotation axis.

An example belonging to the above embodiment will be shown below. That is, the specific dimensions of each roll (dimensions equivalent to 1/3 of the actual segment fitting member) are shown in the following table (unit:
mm), and actually bent. If the angle steel has the same dimensions, the diameter D of the main rolls 3A and 3B, the distance L between the main rolls 3A (see FIG. 1), and the pushing amount h
The curvature radius R of the bending process is determined by the above.

The main roll pressing buckling prevention main roll angle steel bend radius indentation capacity radial diameter D roll diameter roll diameter interval L h R 240 120 100 300 30 × 30 × 3 12 1000 240 120 100 300 30 × 30 × 3 22 500 240 120 100 250 25 × 25 × 3 9 1000 240 120 100 250 25 × 25 × 3 16 500

In these examples, the angle steel does not move in the vertical direction as compared with the case where bending is performed by the conventional roll, and the buckling occurs on the inner side of the bend in the V shape of the angle steel. It was also possible to prevent the occurrence of deformation, to prevent the change in angle (angle change) of the angle steel, and to prevent the angle steel from being twisted.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS. A pair of chevron steels 1 are cross-section butted and temporarily fixed. The butting is performed by changing the symmetry axis (vertical direction in FIG. 6) of the cross section of the angle steel 1 by 180 degrees and overlapping them. As a result, the angle-shaped steels 1 abutted on each other have a square cross section. The temporary fixing was performed by spot welding 17 performed at predetermined intervals in the longitudinal direction of the angle steel 1.

A pair of angle steels 1, 1 temporarily fixed in this way
Are fed into a row of rolls 19 staggered in the longitudinal direction of the angle steel 1 (FIG. 8). Temporarily fixed pair of angle steels 1, 1
Has two axes of symmetry. Therefore, buckling or twisting is unlikely to occur, and bending with a conventional roll can be performed. The cross-sectional shape of each roll 19 has a triangular groove in accordance with the cross-sectional shape of the pair of temporarily-held angle steels 1, 1.

Then, the rolls 19 rotate while alternately contacting one outer surface of the angle steel 1, thereby performing a bending operation. After that, the spot welding 17 is heated with a burner, a cutting tool, or grinder grinding.
Remove the temporary fixing of both 1 and 1. According to this method, two chevron steels can be accurately bent by one bending process, which is highly efficient.

(Other Modifications) In the above second embodiment,
Although the rolls 19 are arranged in a staggered manner, in another modified example, as shown in FIG. 9, a plurality of pairs of rolls 21 provided in pairs with the angle steel 1 interposed may be arranged. By arranging a plurality of pairs of rolls 21 along an arbitrary curve, it is possible to perform bending processing into a shape having an arbitrary curve.

In the above two embodiments, as a long steel material having a cross section having only one axis of symmetry and having a cross section that can be fitted to each other in the direction of this symmetry axis, a chevron steel 1 having a V-shaped cross section is used. However, the present invention can be applied to other steel materials.

For example, as shown in FIG. 10, one having a V-shape whose cross-sectional shape is narrower than the V-shape of the angle steel of 90 degrees (FIG. 10A) or one having a wide V-shape (not shown).
But it is good. Further, the one having a substantially U-shaped cross section and a flat bottom (FIG. 10B) or the one having a round bottom (FIG. 10)
(C)) may be used. In addition, a semicircular cross section (Fig. 10 (D))
But it is good. In addition, the cross-sectional shape is substantially W-shaped (see FIG.
(E)) may be used. Moreover, the cross-sectional shape is wavy (see FIG.
It may be 0 (F).

[0039]

As described above, in the present invention,
By using a roll row instead of the conventional bending method, it is possible to perform bending work to bend a long steel material having a cross-sectional shape that can be fitted to each other in the direction of one axis of symmetry in a plane orthogonal to the axis of symmetry. Become. Therefore, as compared with the conventional baking method, the bending becomes uniform, the bending accuracy can be improved, the cross-sectional shape does not easily change, no correction is required, and the material does not change. In addition, continuous bending is possible, work efficiency is good,
Moreover, it does not require much skill.

[Brief description of drawings]

FIG. 1 is a plan view of a roll row showing an embodiment of the present invention.

FIG. 2 is a front view showing an arrangement relationship of rolls viewed from a longitudinal direction of the angle steel to be processed in FIG.

FIG. 3 is a side view showing an arrangement relationship of respective rolls as seen from a direction perpendicular to a longitudinal direction of the angle steel in FIG.

FIG. 4A is a front view of the twist prevention guide roll of FIG. 1, and FIG. 4B is a front view of a twist prevention guide roll according to another modification.

FIG. 5A is a perspective view of a top arranged to prevent buckling of the angle steel in FIG. 1. (B) is a perspective view of a top according to another embodiment.

FIG. 6 is a perspective view of angle steel processed in a second embodiment of the present invention.

FIG. 7 is a front view of a roll for processing the angle steel of FIG.

FIG. 8 is a schematic plan view of the whole of FIG.

9 is a schematic plan view showing another modified example of FIG. 7. FIG.

10 (A) to 10 (F) show cross sections of steel materials in which the present invention can be carried out.

FIG. 11 is an explanatory diagram of bending of H-section steel with a roll according to the related art.

FIG. 12 is an explanatory diagram of bending of angle iron by the conventional bending method.

[Explanation of symbols]

1 Angle steel (steel material) 3A, 3B Main roll 7A, 7B Holding roll 9 Buckling prevention roll 13, 15A, 15B Twist prevention guide roll (twist prevention guide means) 17 Spot welding

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[Procedure amendment]

[Submission date] August 6, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

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FIG.

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

[Fig. 2]

[Procedure 3]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

[Figure 3]

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

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FIG. 4

Claims (8)

[Claims] 1. A bending method of bending a long steel material having a cross section having only one axis of symmetry and having a cross-sectional shape capable of being fitted to each other in the direction of the axis of symmetry in a plane orthogonal to the axis of symmetry. The main rolls arranged in a zigzag in the longitudinal direction of the steel material rotate and bend while being alternately in contact with one outer surface of the steel material, and the pressing rolls arranged in pairs with the main roll are the inner surface of the steel material. It rotates while pressing the steel material toward the main roll in contact with the roll, and at the same time, the buckling prevention roll arranged in pairs with the pressing roll contacts the outer side of the steel material opposite to the main roll and presses the steel material. A method for bending a steel material, characterized in that the steel material is rotated while being pressed toward. 2. The method of bending a steel material according to claim 1, wherein twisting prevention guide means further provided on the exit side and the entrance side of the steel material with respect to the main roll row sandwich and guide the steel material. 3. The method for bending a steel material according to claim 1, wherein the steel material is an angle steel. 4. A bending method for bending a long steel material having a cross section having only one axis of symmetry and having a cross-sectional shape capable of being fitted to each other in the direction of the axis of symmetry in a plane orthogonal to the axis of symmetry. A pair of steel materials are butted against each other in cross section, and the butting is performed by overlapping the symmetry axes of the cross sections by changing the direction by 180 degrees, temporarily fixing both, and sent to the main roll row arranged in a staggered manner in the longitudinal direction of the steel material. A method for bending a steel material, characterized in that the steel material is rotated in a state of alternately contacting one outer surface of the steel material to perform a bending operation, and then the temporary fixing of both is removed. 5. The method for bending a steel material according to claim 4, wherein the steel material is an angle steel. 6. A bending apparatus for bending a long steel material having a cross section having only one axis of symmetry and having a cross-sectional shape capable of being fitted to each other in the direction of the axis of symmetry in a plane orthogonal to the axis of symmetry. A plurality of main rolls arranged in a staggered manner in the longitudinal direction of the steel material and in contact with one side of the outer side, and arranged in pairs with the main roll, and formed in the same sectional shape as the sectional shape of the steel material, in contact with the inner side surface of the steel material, A plurality of pressing rolls to be pressed toward the main roll, and a pair of pressing rolls arranged on the main roll located inside the bend of the plurality of main rolls are arranged in pairs,
A buckling prevention roll that is in contact with an outer side of the steel material opposite to the main roll and presses the steel material toward the pressing roll. 7. An apparatus for bending a steel material, further comprising guide means for preventing the twisting of the steel material on the exit side and the entrance side of the steel material with respect to the main roll row. 8. The apparatus for bending a steel material according to claim 6, wherein the steel material is an angle steel.