JP5838714B2 - Bending tool - Google Patents

Description

  The present invention relates to a bending tool for bending long materials such as square bars, round bars and pipes.

  As a bending tool for bending a long material, for example, Patent Literature 1 below discloses a bending tool for bending a plurality of rod-shaped portions so as to form a curved shape. Yes. This bending tool has a bending fulcrum at the intersection of a pair of openable and closable lever members, and is configured to bend a plurality of set rod-shaped portions at three points by operating the lever members.

JP 2007-283081 A

By the way, in a welding operation or the like in which a long material is welded to a predetermined member sequentially from one end to the other end, the non-fixed side (unwelded side) of the long material due to thermal deformation during the welding. Bending) to correct fluctuations in the positional relationship on the side).
However, in the above prior art, the influence of bending occurs on both sides of the bending fulcrum. Therefore, in the above-described conventional technology, not only the non-fixed side but also the fixed side (welded side) may be subjected to stress load, resulting in fluctuations in the positional relationship, and bending that corrects thermal deformation during the welding. There is a problem that it is difficult to perform properly.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a bending tool that can bend a long material on one side in the longitudinal direction without affecting the other side.

In order to solve the above-described problems, the present invention provides a bending tool for bending a long material, a first fixing piece located on one side in the short direction of the long material, and a longitudinal direction of the long material. A distance between the first fixed piece on one side and a second fixed piece located on the other side in the short side of the long material, and a distance from the second fixed piece on one side in the longitudinal direction of the long material. A movable piece that is positioned on one side in the short direction of the long material and that applies a bending load to the long material in cooperation with the first fixed piece and the second fixed piece, The structure of having is adopted.
By adopting this configuration, in the present invention, the long material is sandwiched between the first fixed piece, the second fixed piece, and the movable piece, and bending is performed. Since the movable piece is located on one side in the length direction of the long material with respect to the second fixed piece, bending is applied to one side in the longitudinal direction of the long material with the second fixed piece as a fulcrum. On the other hand, since the positional relationship between the second fixed piece and the first fixed piece located on the other side in the longitudinal direction of the long material with respect to the second fixed piece does not change, one longitudinal direction of the long material Even if the side is bent, the other side in the longitudinal direction of the long material is not affected.

Moreover, in this invention, the structure of having the screw part which moves the said movable piece is employ | adopted.
By adopting this configuration, in the present invention, since the movable piece is precisely movable by the rotation of the screw portion, it is possible to perform precise bending.

In the present invention, a restricting portion that restricts the elongate material from being removed from between the first fixed piece and the second fixed piece between the first fixed piece and the second fixed piece. The structure of having is adopted.
By adopting this configuration, in the present invention, the long material is prevented from coming out from between the first fixed piece and the second fixed piece, so that bending is performed with a stronger force without worrying about the coming out. be able to.

  Therefore, according to the present invention, it is possible to obtain a bending tool capable of bending a long material on one side in the longitudinal direction without affecting the other side.

It is a perspective view which shows the bending tool in embodiment of this invention. It is a disassembled perspective view which shows the bending tool in embodiment of this invention. It is a bottom view which shows the bending tool in embodiment of this invention. It is a perspective view which shows the movable piece in embodiment of this invention. It is a figure for demonstrating the bending process using the bending tool in embodiment of this invention. It is a reference figure at the time of using the conventional bending tool. It is a perspective view which shows the movable piece in another embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing a bending tool 1 according to an embodiment of the present invention. FIG. 2 is an exploded perspective view showing the bending tool 1 according to the embodiment of the present invention. FIG. 3 is a bottom view showing the bending tool 1 according to the embodiment of the present invention.

The bending tool 1 is a tool for bending a long material 100 as shown in FIG. Examples of the long material 100 include a metal square, a round bar, and a pipe.
The bending tool 1 includes a first fixed piece 10, a second fixed piece 20 (see FIG. 3), and a movable piece 30. When bending the long material 100 with the bending tool 1, it is preferable to use a torque wrench 50 in order to move the movable piece 30.

  As shown in FIG. 3, the first fixed piece 10 is located on one side of the long material 100 in the short direction (the lower side in the drawing in FIG. 3). As shown in FIGS. 2 and 3, the first fixed piece 10 is provided in the main body 2. The first fixed piece 10 of this embodiment has a cylindrical shape extending in a predetermined direction, and is formed integrally with the main body 2.

  As shown in FIG. 3, the second fixed piece 20 is spaced from the first fixed piece 10 on one side in the longitudinal direction of the long material 100 (left side in FIG. 3), and the short direction of the long material 100. It is located on the other side (the upper side in FIG. 3). The second fixed piece 20 is provided on the main body 2. The second fixed piece 20 of the present embodiment has a cylindrical shape extending in a predetermined direction in parallel with the first fixed piece 10 and is formed integrally with the main body 2.

  The second fixed piece 20 of the present embodiment is provided as a pair with the main body 2. Reference numeral 20 'denotes another second fixing piece. Another second fixing piece 20 'is for reverse bending of the long material 100, and is not used when the long material 100 is set as shown in FIG. The second fixed piece 20 and the other second fixed piece 20 ′ have a positional relationship corresponding to the base angle of an isosceles triangle when the first fixed piece 10 is the apex angle.

  The movable piece 30 is spaced apart from the second fixed piece 20 on one side in the longitudinal direction of the long material 100 (left side in FIG. 3), and one side in the short direction of the long material 100 (lower side in FIG. 3). ) And a configuration in which a bending load is applied to the long material 100 in cooperation with the first fixed piece 10 and the second fixed piece 20. The movable piece 30 of the present embodiment is formed separately from the main body portion 2 and is configured to be movable by the screw portion 31.

FIG. 4 is a perspective view showing the movable piece 30 in the embodiment of the present invention.
The movable piece 30 has a through hole 30a through which a hexagon bolt 32 (see FIG. 2) constituting a part of the screw portion 31 is inserted. The movable piece 30 has a substantially rectangular parallelepiped block shape as a whole, and is configured to be locked to the flange 3 (see FIG. 1) of the main body 2 to restrict relative rotation around the hexagon bolt 32. The movable piece 30 has a convex portion 30 b for pressing the long material 100. The tip of the convex portion 30b has a predetermined curvature and is rounded.

  Returning to FIG. 2, the screw portion 31 includes a hexagon bolt 32, a washer 33, and a screw hole 4 formed in the main body portion 2. The hexagon bolt 32 is configured to pass through the washer 33 and the through hole 30 a of the movable piece 30 and screw into the screw hole 4. Therefore, by rotating the hexagon bolt 32, the movable piece 30 is precisely screw-fed and can be moved close to and away from the long material 100 in a predetermined direction (the vertical direction in FIG. 3).

  In addition, it is also possible to reverse the attachment direction with respect to the main-body part 2 of the movable piece 30. FIG. In this case, it is necessary to screw the hexagon bolt 32 into the screw hole 4 from the side opposite to the screwing shown in FIG. Thus, in the present embodiment, the movable piece 30 has the second fixed piece 20 side (upper side in FIG. 3) and the other second fixed piece 20 ′ side (FIG. 3) with respect to the main body 2. Can be attached from either side of the paper), so that not only bending in cooperation with the second fixed piece 20, but also reverse bending in cooperation with another second fixed piece 20 '. Is also possible.

  As shown in FIGS. 1 and 2, the main body 2 is provided with a handle 5. The handle portion 5 of the present embodiment is a metal pipe and is welded to the main body portion 2. The handle portion 5 is provided so as to extend in the rotational radius direction of the screw portion 31 (hexagon bolt 32). This handle portion 5 has a predetermined length, and is configured so that the torque generated when the screw portion 31 is rotated can be efficiently suppressed by gripping a position away from the main body portion 2 to some extent. Yes.

  Further, the main body portion 2 is provided with a restricting portion 40. As shown in FIG. 3, the restricting portion 40 is provided between the first fixed piece 10 and the second fixed piece 20 extending in parallel with each other, and the first fixed piece 10 of the long material 100 in the extending direction. It is comprised so that the omission from between the 2nd fixed piece 20 may be controlled. The restricting unit 40 includes a lock key 41 and a nut 42.

  As shown in FIG. 2, the lock key 41 is a substantially L-shaped member bent at a right angle. The lock key 41 has a shaft portion 43 in which a screw groove 43a is formed. The lock key 41 is rotatable with respect to the main body 2 by inserting the shaft 43 into a through hole 6 (see FIG. 2) formed in the main body 2 and screwing a nut 42 into the screw groove 43a. It is attached.

  Therefore, by rotating the lock key 41 around the shaft portion 43, it is possible to switch between regulation and release of the long material 100. A protrusion 44 is provided at the tip of the lock key 41 so as to stand in the same direction as the shaft 43. The convex portion 44 is a minute protruding portion that becomes a catch in the short direction of the set long material 100. The distance between the convex portion 44 and the shaft portion 43 is at least longer than the length of the long material 100 in the short direction.

Next, bending using the bending tool 1 having the above-described configuration will be described with reference to FIGS. 5 and 6.
FIG. 5 is a diagram for explaining bending using the bending tool 1 according to the embodiment of the present invention. FIG. 6 is a reference diagram when a conventional bending tool is used. In addition, as shown in FIG.5 and FIG.6, the elongate material 100 used as the bending object demonstrated below is a retaining ring provided in the steam generator. The retaining ring is a square member having a rectangular cross section formed of, for example, a nickel base alloy.

  In the steam generator, a vibration preventing plate 102 for preventing vibration of the heat transfer tube 101 is disposed between the layers of the heat transfer tube 101. The end of the vibration preventing plate 102 extends to the outside of the layer of the heat transfer tube 101 and is inserted and supported by the block 103 disposed outside. The block 103 is welded to the long material 100 which is a retaining ring. In this welding operation, as shown in FIGS. 5A and 6B, the long material 100 is sequentially moved from the one end (the left end on the paper surface) to the other end (the right end on the paper surface) with the block 103. Although welding will be performed, the positional relationship on the non-fixed side (unwelded side: right side of the paper) of the long material 100 may fluctuate due to thermal deformation during the welding, and displacement from the block 103 may occur ( (Shown as a dotted line).

Therefore, it is necessary to perform a bending process for correcting fluctuations in the positional relationship of the long material 100 on the non-fixed side. The bending position P1 is performed at a position separated by a predetermined distance from the current welding position P2.
If a bending process (three-point bending) is performed using a conventional bending tool, as shown in FIG. 6A, one side of the long material 100 in the longitudinal direction (unfixed) with respect to the bending position P1. There is a risk that the positional relationship may vary not only on the side (right side of the paper surface) but also on the other side in the longitudinal direction of the long material 100 (fixed side: left side of the paper surface) (shown by a solid line in FIG. 6A).

  That is, in the bending process using the conventional bending tool, as shown in FIG. 6 (b), the movable piece 120 applies a bending load between the pair of fixed pieces 110. 100 bent parts protrude outside. For this reason, stress load is similarly applied not only to the longitudinal direction one side of the long material 100 but also to the longitudinal direction other side of the long material 100, and as a result, the longitudinal direction of the long material 100 which is a bending work prohibition range. The positional relationship on the other side of the direction may vary. To correct this, the posture of the tool must be changed each time during bending, which is complicated.

On the other hand, in the bending process using the bending tool 1 in the present embodiment, it is possible to perform the bending process without affecting one side in the longitudinal direction of the long material 100 on the other side.
That is, in the bending process using the bending tool 1, as shown in FIG. 5B, the long material 100 is sandwiched between the first fixed piece 10, the second fixed piece 20, and the movable piece 30, and the bending process is performed. Is constructed. Since the movable piece 30 is located on one side in the length direction of the long material from the second fixed piece 20, bending is applied to one side in the longitudinal direction of the long material 100 with the second fixed piece 20 as a fulcrum. It is done.

  On the other hand, the second fixed piece 20 and the first fixed piece 10 located on the other side in the longitudinal direction of the long material 100 with respect to the second fixed piece 20 are also in the longitudinal direction of the long material 100 by the bending process. The positional relationship with the other side does not change. Therefore, in the bending process using the bending tool 1, as shown in FIG. 5A, only one longitudinal side of the long material 100 is bent without affecting the other longitudinal side of the long material 100. (Shown by a solid line in FIG. 5 (a)). Further, it is not necessary to change the posture of the tool each time during bending as in the prior art, and the complexity is eliminated.

  Further, in the present embodiment, since the movable piece 30 is configured to be moved by the screw portion 31, precise bending can be performed by precise screw feeding by the rotation of the hexagon bolt 32. In addition, by adopting the screw portion 31 as the movable mechanism, oil is not used as in the case of employing a hydraulic cylinder, for example, so that the cleanliness is high and impurities are mixed and adhered unlike a steam generator. It is especially useful in prohibited work sites.

  Further, since the handle portion 5 extending in the rotational radius direction of the screw portion 31 is provided in the main body portion 2, it is generated when the hexagon bolt 32 is rotated by the torque wrench 50 by gripping the handle portion 5. Torque can be efficiently suppressed. Further, since the main body portion 2 is provided with the restriction portion 40, the long material 100 is prevented from being detached from the first fixed piece 10 and the second fixed piece 20 without worrying about the removal. Appropriate bending can be performed with a stronger force.

Therefore, according to the above-described embodiment, in the bending tool 1 for bending the long material 100, the first fixed piece 10 positioned on one side in the short direction of the long material 100 and the length of the long material 100. The second fixed piece 20 located on the other side in the short direction of the long material 100 with a gap from the first fixed piece 10 on one side in the direction, and the second fixed piece 20 on one side in the longitudinal direction of the long material 100. A movable piece that is positioned on one side in the short direction of the long material 100 and that gives bending load to the long material 100 in cooperation with the first fixed piece 10 and the second fixed piece 20. 30, the movable piece 30 is bent on one side in the longitudinal direction of the long material 100 with the second fixed piece 20 as a fulcrum, while the first fixed piece 10 and the first fixed piece 10 2 Longitudinal direction other side of long material 100 with fixed piece 20 It does not change the positional relationship of each other against.
Therefore, according to the present embodiment, one side in the longitudinal direction of the long material 100 can be bent without affecting the other side.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the above-described embodiment, the mode in which the movable piece and the screw portion are separated from each other has been described. However, as shown in FIG. 7, the movable piece 30 and the screw portion 31 ′ may be integrated. This is because a bending tool having a smaller number of parts is easier to assemble and is easy to use even at an assembly site of a steam generator having a high degree of cleanliness. If the screw part 31 ′ shown in FIG. 7 is provided in the movable piece 30, a hexagonal nut 34 is required instead. However, since it is not necessary to form a screw hole in the main body part 2, the main body is more than the above embodiment. Removal / attachment of the movable piece 30 to the portion 2 is facilitated. Therefore, the reverse bending of the long material 100 can be performed quickly and easily with the mounting direction of the movable piece 30 to the main body 2 reversed.

  Further, for example, the arrangement of the first fixed piece 10, the second fixed piece 20, another second fixed piece 20 ′, and the movable piece 30 in the above embodiment is an example. Therefore, for example, the movable piece 30 may be rearranged to a position farther away from the positions of the first fixed piece 10, the second fixed piece 20, and the like. According to this configuration, since the bending position and the load application position can be separated, even when it is desired to perform bending in a narrow portion, it is possible to secure a space for rotating the screw portion at a remote position. There is.

  DESCRIPTION OF SYMBOLS 1 ... Bending tool, 2 ... Main-body part, 5 ... Handle part, 10 ... 1st fixed piece, 20 ... 2nd fixed piece, 20 '... 2nd fixed piece, 30 ... Movable piece, 31 ... Screw part, 40 ... Restriction Part, 100 ... long material

Claims (2)

In bending tools for bending long materials,
A first fixed piece located on one side in the short direction of the long material;
A second fixed piece located on the other side in the short side of the long material, spaced from the first fixed piece on one side in the longitudinal direction of the long material;
The long material is positioned on one side in the short direction of the long material, spaced from the second fixed piece on one side in the longitudinal direction of the long material, and cooperates with the first fixed piece and the second fixed piece. And a movable piece for applying a bending load to the long material,
Between the first fixed piece and the second fixed piece, there is a restricting portion for restricting the elongate material from coming out between the first fixed piece and the second fixed piece,
The restricting portion is attached to the main body provided with the first fixed piece and the second fixed piece so as to be rotatable between a position where the restriction is performed and a position where the restriction is released. Bending tool to do.   The bending tool according to claim 1, further comprising a screw portion that moves the movable piece.

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