Reinforcing-bar bending machine and reinforcing-bar bending method

Abstract

To provide a reinforcing-bar bending machine which can accurately bend a reinforcing-bar to a desired angle, and to provide a reinforcing-bar bending method.SOLUTION: A reinforcing-bar bending machine 100 includes: a fulcrum member 11 forming a fulcrum of bending; effort members (a first effort member 21 and a second effort member 22) which may rotate around the fulcrum member 11; and a processor which controls the effort members. The processor exercises first control in which the effort member is rotated in a first direction to bend a supplied reinforcing-bar to a bending angle larger than a target bending angle and second control in which the effort member is rotated in a second direction opposite to the first direction to bend the reinforcing-bar which has been bent by the first control backward.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a rebar bending machine and a method for bending a rebar. [Background technology]

[0002] Patent Document 1 describes a bender for coils, etc., which includes a bending roller arranged on the delivery side of a delivery roller that clamps and delivers a tube material, etc., and bends the tube material, etc. while pressing it radially inward, and a correction roller that pushes the tube material, etc. that has been processed by the bending roller back radially outward.

[0003] Patent Document 2 describes a method of predicting the relationship between the bending angle and the amount of springback using the measurement results of the first bending angle measurement step, in which a deformed bar is bent to a predetermined bending angle and then the bending force of a force point member on the deformed bar is released, and then the bending angle of the deformed bar is measured; a second bending angle measurement step, in which the bar from which the bending force of the force point member has been released is bent to another bending angle and then the bending force of the force point member on the deformed bar is released, and then the second bending angle measurement step is performed once or a plurality of times. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 56-68528 [Patent Document 2] JP 2023-44532 A Summary of the Invention [Problem to be solved by the invention]

[0005] The technique disclosed herein aims to provide a reinforcing bar bending machine and a reinforcing bar bending method capable of bending reinforcing bars to a desired angle with high precision. [Means for solving the problem]

[0006] The technology of the present disclosure is as follows. In the following, the corresponding components in the embodiments described later are described in parentheses, but the present invention is not limited to these.

[0007] (1) A fulcrum member (fulcrum member 11) that constitutes a fulcrum for bending; a force application member (a first force application member 21 and a second force application member 22) that is movable relative to the fulcrum member; a processor (processor of the control device 40) for controlling the force application members, The processor performs a first control of moving the force point member to bend the supplied reinforcing bar, and a second control of moving the force point member to bend the reinforcing bar that has been bent by the first control back in a direction opposite to the bending direction of the reinforcing bar by the first control. (Reinforcing bar bending machine 100)

[0008] (2) A rebar bending machine as described in (1), The force point members include a first force point member (first force point member 21) arranged on one side of the supplied reinforcing bar, and a second force point member (second force point member 22) arranged on the other side of the reinforcing bar, When the first control is performed, the first force application member applies a bending force to the reinforcing bar, A rebar bending machine, wherein the second force point member applies a bending force to the rebar when the second control is performed.

[0009] (3) (2) A reinforcing bar bending machine according to the present invention, the first force application member and the second force application member are rotatable around the fulcrum member, The second force point member is configured so that the rotation radius thereof can be changed.

[0010] (4) A reinforcing bar bending machine according to any one of (1) to (3), A first support part (support device 30) is provided to support one end of the supplied reinforcing bar, The first support portion of the reinforcing bar bending machine includes at least one of a first portion (front member 32 and rear member 31) that applies pressure to the reinforcing bar in a third direction and a second portion (upper member 33 and lower member 34) that applies pressure to the reinforcing bar in a fourth direction intersecting the third direction.

[0011] (5) A reinforcing bar bending machine according to (4), The reinforcing bar bending machine is provided with a second support part (reinforcing bar receiving part 12) that is arranged on the opposite side of the supplied reinforcing bar to the fulcrum member and supports the reinforcing bar.

[0012] (6) (5) A reinforcing bar bending machine according to the present invention, A rebar bending machine in which the second support portion is formed to extend in a direction along the supplied rebar before bending, and the end portion opposite the first support portion protrudes in the above direction further than the fulcrum member toward the opposite side to the first support portion.

[0013] (7) A reinforcing bar bending machine according to any one of (1) to (3), In the first control, the reinforcing bar bending machine bends the supplied reinforcing bar to a bending angle greater than a target bending angle.

[0014] (8) A reinforcing bar bending method for bending a reinforcing bar using a fulcrum member (fulcrum member 11) that constitutes a fulcrum for bending, and force point members (first force point member 21 and second force point member 22) that are movable relative to the fulcrum member, A first step of bending the supplied reinforcing bar by moving the force application member; a second step of moving the force application member to bend the reinforcing bar that has been bent in the first step back in a direction opposite to the bending direction of the reinforcing bar in the first step.

[0015] (9) (8) A reinforcing bar bending method according to the present invention, A reinforcing bar bending method comprising: after the first step, supporting one end of the bent reinforcing bar; and performing the second step while the one end is supported. Effect of the Invention

[0016] According to (1) and (7), for example, when bending multiple reinforcing bars simultaneously, even if the bending angles of the reinforcing bars vary after the first control, this variation can be absorbed by unbending the reinforcing bars through the second control, and each reinforcing bar can be bent with high precision to the target angle. Even when bending a single reinforcing bar, the reinforcing bar can be bent with high precision to the target angle by unbending the reinforcing bars through the second control, taking into account the springback caused by the first control.

[0017] According to (2), the first control and the second control can be executed at high speed, and the efficiency of the bending process can be improved.

[0018] According to (3), the rotation radius of the second force application member can be adjusted according to the length of the portion of the reinforcing bar to be bent, thereby making it possible to further improve the bending accuracy.

[0019] According to (4), when bending multiple reinforcing bars at the same time, the multiple reinforcing bars can be tightly attached to each other to prevent the reinforcing bars from shifting from one position to the other, thereby improving the bending accuracy.

[0020] According to (5), the second control is performed while the base end of the portion bent by the first control is supported by being clamped between the second support part and the fulcrum member, and one end of the reinforcing bar is supported by the first support part, so that the reinforcing bar can be bent back stably, and the bending accuracy can be further improved.

[0021] According to (6), since the force applied to the reinforcing bar during the second control can be received by the second support portion, the reinforcing bar can be bent back stably, and the bending accuracy can be further improved.

[0022] According to (8), for example, when bending multiple rebars at the same time, even if the bending angles of the rebars vary after the first step, this variation can be absorbed by bending the rebars back in the second step, and each rebar can be bent with precision to the target angle. Even when bending a single rebar, the rebar can be bent with precision to the target angle by performing the bending back in the second step while taking into account the springback caused by the first step.

[0023] According to (9), when bending multiple reinforcing bars at the same time, the multiple reinforcing bars can be tightly attached to each other to prevent the reinforcing bars from being pulled in when bending them back, thereby improving the bending accuracy. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is a plan view showing a schematic configuration of a reinforcing bar bending machine 100 according to one embodiment of the technology of the present disclosure. [Diagram 2] FIG. 2 is a plan view (part 1) showing the state of the reinforcing bar bending machine 100 during bending. [Diagram 3] FIG. 3 is a second plan view showing the state of the reinforcing bar bending machine 100 during bending. [Figure 4] FIG. 4 is a plan view (part 1) showing a state during bending of the modified reinforcing bar bending machine 100. As shown in FIG. [Diagram 5] FIG. 5 is a second plan view showing the modified reinforcing bar bending machine 100 during bending. [Figure 6] FIG. 6 is a third plan view showing the modified reinforcing bar bending machine 100 during bending. [Figure 7] FIG. 7 is a diagram showing a configuration example of a reinforcing bar bending machine 100 capable of bending a reinforcing bar T in both the forward and backward directions. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Fig. 1 is a plan view showing a schematic configuration of a reinforcing bar bending machine 100 according to one embodiment of the technology of the present disclosure. The reinforcing bar bending machine 100 is a device for bending reinforcing bars T such as round steel or deformed reinforcing bars. The reinforcing bar bending machine 100 is capable of supplying a plurality of reinforcing bars T overlapping each other in the radial direction and bending the plurality of reinforcing bars T simultaneously. The reinforcing bar bending machine 100 can also be used when bending a single reinforcing bar T.

[0026] The rebar bending machine 100 has a flat reference surface portion 10 that forms a reference plane that specifies the bending direction during bending. The reference surface portion 10 has an annular hole portion 10A, and an annular rotating member 20 is provided inside the hole portion 10A so as to be rotatable in its circumferential direction (the direction indicated by the thick arrow in the figure). In the following, the direction perpendicular to the reference surface portion 10 is defined as the up-down direction, one of two directions perpendicular to the up-down direction and perpendicular to each other is defined as the left-right direction, and the other is defined as the front-rear direction. In FIG. 1, one side of the left-right direction is described as the right direction R, the opposite direction of the right direction R is described as the left direction L, one side of the front-rear direction is described as the front direction Fr, and the opposite direction of the front direction Fr is described as the rear direction Rr. In FIG. 1, the direction from the front of the paper to the back is described as the downward direction, and the opposite direction of the downward direction is described as the upward direction.

[0027] The rebar bending machine 100 comprises a fulcrum member 11 and a rebar receiving portion 12 fixed to the upper surface of a reference surface portion 10 located inside the hole portion 10A, a first force point member 21 and a second force point member 22 fixed to the upper surface of a pivoting member 20, a support device 30 that supports one end (the right end in the example shown in the figure) of the supplied rebar T, and a control device 40.

[0028] The fulcrum member 11 is a member that constitutes a fulcrum for bending, and is formed, for example, of a cylindrical roller whose vertical direction and axial direction coincide with each other.

[0029] The reinforcing bar receiving portion 12 is disposed on the opposite side to the fulcrum member 11 with the supplied reinforcing bar T sandwiched therebetween. The reinforcing bar receiving portion 12 is, for example, in the form of a rectangular plate whose thickness direction coincides with the front-rear direction and extends in the left-right direction. The front surface of the reinforcing bar receiving portion 12 is a flat surface perpendicular to the reference surface portion 10, and the reinforcing bar receiving portion 12 supports the reinforcing bar T on this front surface. In the left-right direction, the left edge of the reinforcing bar receiving portion 12 is provided so as to protrude further left than the fulcrum member 11. In other words, the distance D in the left-right direction between the left edge of the fulcrum member 11 and the left edge of the reinforcing bar receiving portion 12 is greater than 0.

[0030] The first force point member 21 and the second force point member 22 are each formed of, for example, a cylindrical roller whose up-down direction and axial direction coincide with each other. The first force point member 21 is placed on one side (rear side) of the reinforcing bar T before bending that has been supplied to the reinforcing bar bending machine 100 and placed on the reference surface portion 10, and the second force point member 22 is placed on the other side (front side) of this reinforcing bar T. When bending multiple reinforcing bars T at the same time, these multiple reinforcing bars T are placed on the reference surface portion 10 in a vertically stacked state.

[0031] The support device 30 includes a front member 32 arranged in front of the supplied reinforcing bar T, a rear member 31 arranged in rear of the supplied reinforcing bar T, an upper member 33 arranged on the upper side of the supplied reinforcing bar T, and a lower member 34 arranged on the lower side of the supplied reinforcing bar T. The front member 32 and the rear member 31 are arranged opposite each other with the reinforcing bar T in between, and each of the front member 32 and the rear member 31 is pressed toward the reinforcing bar T. The upper member 33 and the lower member 34 are arranged opposite each other with the reinforcing bar T in between, and each of the upper member 33 and the lower member 34 is pressed toward the reinforcing bar T. In this way, the support device 30 supports the reinforcing bar T by sandwiching it from two directions, the front-rear direction and the up-down direction. The front-rear direction constitutes a third direction, and the up-down direction constitutes a fourth direction intersecting the third direction. This makes it possible to prevent the relative positions of the reinforcing bars T from shifting even when bending multiple reinforcing bars T with different diameters at the same time. The support device 30 can obtain such an effect as long as it has a structure in which the reinforcing bar T is sandwiched and supported from two intersecting directions.

[0032] The control device 40 controls the entire rebar bending machine 100, and is configured to include a processor such as a CPU (central processing unit) and a memory. The rotating member 20 is rotated by an actuator (not shown), and the processor of the control device 40 controls this actuator to rotate the rotating member 20 and bend the rebar T. As the rotating member 20 rotates, the first force point member 21 and the second force point member 22 fixed to it rotate around the fulcrum member 11. As for the rotation direction of the rotating member 20, the clockwise direction in the plan view in FIG. 1 is defined as a first direction, and the counterclockwise direction opposite to the first direction is defined as a second direction.

[0033] A reinforcing bar bending method using the reinforcing bar bending machine 100 configured as described above will be described with reference to Figs. 2 and 3. Figs. 2 and 3 are plan views showing the state of the reinforcing bar bending machine 100 during bending. First, as shown in Fig. 1, the worker places the reinforcing bar T between the fulcrum member 11 and the reinforcing bar receiving portion 12, and supports the right end of the reinforcing bar T with the support device 30. Next, when the worker performs an operation to start bending, the processor of the control device 40 performs a first control to rotate the rotating member 20 in a first direction and bend the reinforcing bar T to a bending angle larger than a target bending angle. As the rotating member 20 rotates in the first direction, the first force point member 21 comes into contact with the reinforcing bar T from the rear side, as shown in Fig. 2, and a bending force is applied to the reinforcing bar T, and the reinforcing bar T is bent in the first direction. In this first control, the processor of the control device 40 rotates the rotating member 20 so that the reinforcing bar T is bent to an angle (for example, 95 degrees) slightly larger than the target bending angle of the reinforcing bar T (for example, 90 degrees).

[0034] After the first control, the processor of the control device 40 performs a second control in which the rotating member 20 is rotated in a second direction to unbend the reinforcing bar T bent by the first control. As the rotating member 20 is rotated in the second direction, as shown in FIG. 3, the second force application member 22 comes into contact with the reinforcing bar T, a bending force is applied to the reinforcing bar T, and the reinforcing bar T is bent back in the second direction. In this second control, the processor of the control device 40 rotates the rotating member 20 so that the reinforcing bar T reaches the target bending angle (90 degrees). The amount of rotation of the rotating member 20 in the second control may be a value determined experimentally.

[0035] In the second control, a force is exerted on the reinforcing bar T to the left, but the supporting force of the supporting device 30 maintains the left-right position of the reinforcing bar T. In addition, the base end of the portion of the reinforcing bar T bent in the first control is pressed against an area of ​​the reinforcing bar receiving portion 12 that protrudes further to the left than the fulcrum member 11, and the reinforcing bar T is bent back using this area as a fulcrum. These actions make it possible to more effectively transmit the bending back force to the reinforcing bar T. By the above first and second controls, it is possible to obtain a reinforcing bar T that has been bent to the target bending angle.

[0036] Here, the behavior of two reinforcing bars T with different diameters when bending them with the reinforcing bar bending machine 100 will be described. When the first control is performed, the distance between the fulcrum member 11 and the first force point member 21 is constant, and the two reinforcing bars T are sandwiched between the fulcrum member 11 and the first force point member 21, so there is a difference in the timing at which bending force starts to be applied to each of the two reinforcing bars T. As a result, for example, the reinforcing bar T with the larger diameter is bent more. In the second control, the fulcrum member 11 and the second force point member 22 come into contact with the two reinforcing bars T from the same direction, so that the two reinforcing bars T can be bent back to a desired angle regardless of their diameters. In this way, the reinforcing bar bending machine 100 can align the bending angles of each reinforcing bar T even when bending a plurality of reinforcing bars T at the same time. Here, we have explained multiple reinforcing bars T with different diameters, but even if two reinforcing bars T have the same diameter, the same phenomenon can occur if the orientation of the ribs is different, so it is effective to perform the first control and the second control.

[0037] When two reinforcing bars T with different diameters are bent by the reinforcing bar bending machine 100, the first control may be performed so that the thinner of the two reinforcing bars T is bent to a target bending angle. In this case, the thicker of the two reinforcing bars T is bent to a greater angle than the target bending angle by the first control. Therefore, the second control can be performed to bend the thicker of the two reinforcing bars T back to the target bending angle. As a result, it is possible to obtain a state in which the two reinforcing bars T are bent to the target bending angle.

[0038] Also, the position of the second force point member 22 in the radial direction of the rotating member 20 may be configured to be changeable among multiple positions, rather than being fixed. That is, the rotation radius of the second force point member 22 may be configured to be changeable. For example, the second force point member 22 may be made movable to the position shown by the dotted line in FIG. 1. In this way, the second force point member 22 can be disposed at an appropriate position according to the length of the reinforcing bar T to be processed, and the bending accuracy of the reinforcing bar T can be improved. Note that in the reinforcing bar bending machine 100, the position of the first force point member 21 in the radial direction of the rotating member 20 may be configured to be changeable among multiple positions, rather than being fixed. In this way, it becomes possible to accommodate changes in the length of the reinforcing bar T to be processed.

[0039] The reinforcing bar bending machine 100 is designed to bend the reinforcing bar T, which is supplied so that the left-right direction and the axial direction coincide, toward the front direction, but it is also possible to bend the reinforcing bar T in both the forward and backward directions. In this case, for example, a second fulcrum member having the same function as the fulcrum member 11 may be provided instead of the reinforcing bar receiving portion 12. In this case, the rotating member 20 may be rotated counterclockwise from the initial state shown in Fig. 1 to bend the reinforcing bar T to a bending angle greater than the target bending angle by the second force point member 22, and then the rotating member 20 may be rotated clockwise to unbend the reinforcing bar T by the first force point member 21.

[0040] Alternatively, it is possible to bend the reinforcing bar T in both the forward and backward directions by devising the configuration of the fulcrum member 11 and the reinforcing bar receiving portion 12. Fig. 7 is a diagram showing an example of the configuration of a reinforcing bar bending machine 100 that can bend the reinforcing bar T in both the forward and backward directions.

[0041] The modified reinforcing bar bending machine 100 shown in Fig. 7 has the same configuration as the reinforcing bar bending machine 100 shown in Fig. 1, except that the fulcrum member 11 is changed to fulcrum member 11A, and the reinforcing bar receiving part 12 is changed to reinforcing bar receiving part 12A. The fulcrum member 11A and the reinforcing bar receiving part 12A each have an arc-shaped left end, and the surfaces facing the reinforcing bar T (the rear side surface of the fulcrum member 11A and the front side surface of the reinforcing bar receiving part 12A) are flat.

[0042] In the reinforcing bar bending machine 100 shown in FIG. 7, by rotating the rotating member 20 clockwise from the state shown in FIG. 7, a bending force can be applied to the reinforcing bar T by the first force point member 21, and the reinforcing bar T can be bent forward, as in the reinforcing bar bending machine 100 shown in FIG. 1. Also, by rotating the rotating member 20 counterclockwise from the state shown in FIG. 7, a bending force can be applied to the reinforcing bar T by the second force point member 22, and the reinforcing bar T can be bent backward. In this case, the reinforcing bar receiving portion 12A functions as a fulcrum member, and the fulcrum member 11A functions as a reinforcing bar receiving portion. When bending the reinforcing bar T backward in this way, the reinforcing bar T can be bent back by rotating the rotating member 20 clockwise after bending and applying a bending force to the reinforcing bar T by the first force point member 21. In the rebar bending machine 100 shown in FIG. 7, by configuring not only the rotation radius of the second force point member 22 but also the rotation radius of the first force point member 21 (the position of the second force point member 22 in the radial direction of the rotating member 20) to be changeable, it is possible to position the first force point member 21 in an appropriate position depending on the length of the rebar T to be processed, and to improve the bending processing accuracy of the rebar T.

[0043] In the above description, a bending force is applied to the reinforcing bar T by the first force point member 21 during the first control, and a bending force is applied to the reinforcing bar T by the second force point member 22 during the second control, but this is not limited to this. For example, it is also possible to perform the bending operation of the reinforcing bar T to a target bending angle or a bending angle larger than the target bending angle, and the subsequent unbending operation, using a single force point member.

[0044] For example, in the rebar bending machine 100, the rotating member 20 and the second force point member 22 are omitted, and the first force point member 21 is configured to be movable in the circumferential direction within the hole 10A. The first force point member 21 is also configured to be movable in the vertical direction. Then, with the first force point member 21 in the position shown in FIG. 1, the first force point member 21 is rotated clockwise to bend the rebar T to a bending angle greater than the target bending angle, as shown in FIG. 4. Thereafter, the first force point member 21 is moved downward, and in this state, the first force point member 21 is further rotated clockwise to pass under the bent rebar T and move to a position to the right of the rebar T, as shown in FIG. 5. Thereafter, the first force point member 21 is returned to its original position in the vertical direction, and in this state, the first force point member 21 is rotated counterclockwise to bend the rebar T back to the target bending angle, as shown in FIG. 6. By doing as described above, even if a single force application member is used, it is possible to obtain a reinforcing bar T that has been bent to a target bending angle.

[0045] Furthermore, the second force application member 22 does not need to be a roller, and may be, for example, a cylinder. In this case, for example, in the state shown in Fig. 2, the movable part of the cylinder provided at the position of the second force application member 22 can be moved toward the reinforcing bar T and pressed against the reinforcing bar T to bend the reinforcing bar T back. Note that a plate-shaped member may be attached to the movable part of the cylinder, and the plate-shaped member may be pressed against the reinforcing bar T to bend it back.

[0046] In the above description, in the supporting device 30, the front member 32 and the rear member 31 are each pressed toward the reinforcing bar T, but this is not limited thereto. For example, the front member 32 and the rear member 31 may function as guide members that guide the reinforcing bar T so that the reinforcing bar T does not move in the front-rear direction. In this case, the supporting device 30 supports the reinforcing bar T by sandwiching it only in the vertical direction. Even with this configuration, it is possible to prevent the relative positions of multiple reinforcing bars T from shifting when multiple reinforcing bars T with different diameters are bent simultaneously.

[0047] Also, although the left end of reinforcing bar receiving portion 12 is assumed to protrude further to the left than fulcrum member 11 in the left-right direction, this is not essential. Also, reinforcing bar receiving portion 12 is not essential. For example, when the target bending angle is sufficiently greater than 90 degrees (such as 180 degrees), the base end of the portion of reinforcing bar T bent in the first control will be pressed against fulcrum member 11 during bending back in the second control. For this reason, even if reinforcing bar receiving portion 12 is not present, the bending back force can be transmitted sufficiently to reinforcing bar T.

[0048] When the first control is performed, it is not essential that the supporting device 30 supports the reinforcing bar T, and the first control may be performed in a state in which the reinforcing bar T is not supported by the supporting device 30. In this way, even if the supporting device 30 is not supporting the reinforcing bar T during the first control, it is preferable that the supporting device 30 supports the reinforcing bar T when the second control is performed. That is, after the first control is performed, the worker supports the right end of the bent reinforcing bar T with the supporting device 30, and in that state, causes the control device 40 to execute the second control. This also makes it possible to improve the bending accuracy of the reinforcing bar T.

[0049] The position where the support device 30 is provided is not limited to the example shown in the drawings, and can be changed as appropriate. [Explanation of symbols]

[0050] 10 Reference plane section 10A hole 11 Support member 12 Reinforcement bar support 20 Rotating member 21 First force point member 22 Second force point member 30 Support device 31 Rear member 32 Front member 33 Upper member 34 Lower part 40 Control device 100 Rebar bending machine

Claims

1. A fulcrum member that constitutes a fulcrum for bending; a force application member movable relative to the fulcrum member; A processor for controlling the force application member; The processor performs a first control of moving the force application member to bend the supplied reinforcing bar, and a second control of moving the force application member to bend the reinforcing bar that has been bent by the first control back in a direction opposite to the bending direction of the reinforcing bar by the first control.

2. The reinforcing bar bending machine according to claim 1, The force point members include a first force point member arranged on one side of the supplied reinforcing bar, and a second force point member arranged on the other side of the reinforcing bar, When the first control is performed, the first force application member applies a bending force to the reinforcing bar, A rebar bending machine, wherein the second force point member applies a bending force to the rebar when the second control is performed.

3. The reinforcing bar bending machine according to claim 2, the first force application member and the second force application member are rotatable around the fulcrum member, The second force point member is configured to be able to change a rotation radius.

4. A reinforcing bar bending machine according to any one of claims 1 to 3, A first support portion is provided to support one end of the supplied reinforcing bar, The first support portion includes at least one of a first portion that applies pressure to the reinforcing bar in a third direction and a second portion that applies pressure to the reinforcing bar in a fourth direction intersecting the third direction.

5. The reinforcing bar bending machine according to claim 4, A reinforcing bar bending machine comprising a second support part arranged on the opposite side of the supplied reinforcing bar from the fulcrum member and supporting the reinforcing bar.

6. The reinforcing bar bending machine according to claim 5, A rebar bending machine, wherein the second support portion is formed extending in a direction along the supplied rebar before bending, and the end portion opposite the first support portion protrudes in the direction opposite the first support portion further than the fulcrum member.

7. A reinforcing bar bending machine according to any one of claims 1 to 3, In the first control, the reinforcing bar bending machine bends the supplied reinforcing bar to a bending angle greater than a target bending angle.

8. A reinforcing bar bending method for bending a reinforcing bar using a fulcrum member that constitutes a fulcrum for bending and a force application member that is movable relative to the fulcrum member, A first step of bending a supplied reinforcing bar by moving the force application member; a second step of moving the force application member to bend the reinforcing bar that has been bent in the first step back in a direction opposite to the bending direction of the reinforcing bar in the first step.

9. The reinforcing bar bending method according to claim 8, A reinforcing bar bending method comprising: after the first step, supporting one end of the bent reinforcing bar; and performing the second step while the one end is supported.

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