JP2018122311A - Flat wire bender - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a friction force between a holding member and side faces of a flat wire, and to stably bend the flat wire.SOLUTION: A flat wire bender comprises: a holding member for holding both side faces of a flat wire at long-side sides so as to sandwich them; a shaft member on which one side face of the flat wire at a short-side side abuts; a bending member for bending the flat wire following a curved face of an external peripheral face of the shaft member by being rotated along an external periphery of the shaft member while pressing the other side face of the flat wire at the short-side side, and also pressing one side face at the short-side side to an external peripheral face of the shaft member; and a rotating mechanism for rotating the holding member in conjunction with the rotation of the bending member.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rectangular wire bending apparatus that forms a coil by bending a rectangular wire having a rectangular cross-sectional shape.

  A holding member that holds both side surfaces of the long side of the flat wire, a shaft member that contacts one side surface of the short side of the flat wire, and the other side surface of the short side of the flat wire, A bending member that bends the flat wire in accordance with the curved surface of the outer peripheral surface by pressing one side surface on the short side of the flat wire against the outer peripheral surface while rotating along the outer periphery of the shaft member. A flat wire bending apparatus is known (for example, see Patent Document 1).

Japanese Patent Laying-Open No. 2006-152652

  By the way, oil adheres to the surface of the rectangular wire, and the amount of oil changes depending on the transportation, temperature, storage state, etc. of the rectangular wire. For example, when the amount of oil is small, the frictional force between the holding member and the side surface of the flat wire is increased. Further, when the flat wire is bent, a bent bulge portion in which the width of the short side is increased by bending is generated in the bent portion of the flat wire. Therefore, the bending bulge portion may be insufficiently pressed by the bending member due to an increase in frictional force due to swelling and an increase in frictional force due to a small amount of oil. May occur.

  The present invention has been made to solve such a problem, and provides a rectangular wire bending apparatus that can suppress the frictional force between the holding member and the side surface of the rectangular wire and realize stable rectangular wire bending. Is the main purpose.

In order to achieve the above object, one embodiment of the present invention provides:
A rectangular wire bending apparatus for bending a rectangular wire with a cross-sectional shape to form a coil,
A holding member that holds both the side surfaces on the long side of the rectangular wire, and
A shaft member with which one side surface on the short side of the rectangular wire contacts,
By pressing the other side surface on the short side of the rectangular wire and rotating along the outer periphery of the shaft member while pressing one side surface on the short side against the outer peripheral surface of the shaft member, A bending member that bends the flat wire according to the curved surface of the outer peripheral surface of the shaft member;
A rotation mechanism that rotates the holding member in conjunction with rotation of the bending member;
Comprising
This is a flat wire bending apparatus characterized by the above.

  According to the present invention, it is possible to provide a rectangular wire bending apparatus that can suppress the frictional force between the holding member and the side surface of the rectangular wire and realize stable rectangular wire bending.

It is a perspective view which shows schematic structure of the flat wire bending apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing which shows schematic structure of the flat wire bending apparatus which concerns on Embodiment 1 of this invention. It is a flowchart which shows the flow of the coil formation method by the rectangular wire bending apparatus which concerns on Embodiment 1 of this invention. (A) It is a top view which shows the positional relationship of a bending piece, the convex part of a flange member, and the convex part of a shaft member. (B) It is an upper surface view which shows the positional relationship of a bending piece, the convex part of a flange member, and the convex part of a shaft member. It is sectional drawing which shows schematic structure of the flat wire bending apparatus which concerns on Embodiment 2 of this invention. (A) It is a top view which shows the positional relationship of a bending piece and the convex part of a shaft member. (B) It is a top view which shows the positional relationship of a bending piece and the convex part of a shaft member. (A) It is a figure which shows the clamped state of the 1st and 2nd clamp part. (B) It is a figure which shows the unclamped state of the 1st and 2nd clamp part.

Embodiment 1
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a schematic configuration of a flat wire bending apparatus according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view showing a schematic configuration of the flat wire bending apparatus according to the first embodiment. The flat wire bending apparatus 1 according to the first embodiment forms a coil by edgewise bending a flat wire D having a rectangular cross-sectional shape. The flat wire D is used, for example, in a coil attached to a rotor or stator of a rotating electrical machine such as a motor or a generator, and the space factor is improved.

  In the rectangular wire bending device 1 according to the present embodiment, the flange member 2 and the center guide 3 that hold the both sides of the long side of the flat wire are in contact with one side surface of the short side of the flat wire D. The shaft member 4 is provided with a bending piece 5 that abuts against the other side surface on the short side of the flat wire D and bends the flat wire D.

  For example, the flange member 2 and the shaft member 4 are integrally formed as a flange shaft, but may be separately formed and connected. The flange member 2 is formed in a disk shape. The shaft member 4 is formed in a columnar shape. The flange member 2 and the shaft member 4 are configured in an umbrella shape as a whole.

  The center guide 3 includes a base portion 31 formed in an umbrella shape, a bearing portion 32 provided in the base portion 31, and an annular rotating portion 33 provided in the bearing portion 32. The base portion 31 is in a stationary state in which it is fixed at a predetermined position and does not operate such as rotating.

  The base portion 31 has a hole portion 34 formed in the center portion along the axial direction. The shaft member 4 is inserted into the hole 34. A cylindrical concave portion is formed in the umbrella portion of the base portion 31. The bearing portion 32 is fitted and fixed in the concave portion.

  The shaft member 4 is inserted into the center hole of the bearing portion 32. One end surface of the rotating portion 33 is in contact with the bearing portion 32. The bearing portion 32 receives a load applied to the flange member 2 described later via the shaft member 4. The shaft member 4 is inserted into the center hole of the rotating part 33.

  The flange member 2 and the center guide 3 are specific examples of the holding member. A load is applied to the flange member 2 in the downward direction. Thereby, both the side surfaces on the long side of the flat wire D are held between the lower surface of the flange member 2 and the upper surface of the rotating portion 33 of the center guide 3 so as to be sandwiched from above and below. A backup member 6 is provided between the lower surface of the flange member 2 and the upper surface of the rotating portion 33 of the center guide 3 at a position facing the flat wire D. By adjusting the thickness of the backup member 6, it is possible to optimally adjust the sandwiching force when sandwiching both side surfaces on the long side of the rectangular wire D.

  The bending piece 5 is a specific example of a bending member. The bending piece 5 presses the other side surface on the short side of the flat wire D. The bending piece 5 rotates along the outer periphery of the shaft member 4 while pressing one side surface on the short side of the flat wire D against the outer peripheral surface of the shaft member 4. The flat wire D is bent according to the curved surface of the outer peripheral surface. For example, the bending piece 5 rotates (moves in a circular orbit) along the circular shape of the umbrella portion of the center guide 3. The bending piece 5 is provided with a rotation driving mechanism that is connected so as to be able to transmit drive by a gear or the like.

  FIG. 3 is a flowchart showing a flow of a coil forming method by the rectangular wire bending apparatus according to the first embodiment.

  First, at the position where the flat wire D is bent, both side surfaces on the long side of the flat wire D are sandwiched from above and below between the lower surface of the flange member 2 and the upper surface of the rotating portion 33 of the center guide 3 (step S101).

  Next, the bending piece 5 rotates along the outer periphery of the shaft member 4 while pressing one side surface on the short side of the rectangular wire D against the outer peripheral surface of the shaft member 4. The rectangular wire D is bent according to the curved surface of the outer peripheral surface (step S102). At this time, the bending piece 5 bends the flat wire D at an angle slightly larger than 90 ° according to the curved surface of the outer peripheral surface of the shaft member 4. This is because the bending of the rectangular wire D is plastic deformation, but there is inevitably some elastic deformation component and so-called springback occurs. Therefore, the above bent shape is set so that it becomes a right angle in a state where the bending is slightly returned after opening as described later.

The flat wire D is sandwiched between the lower surface of the flange member 2 and the upper surface of the rotating portion 33 of the center guide 3 (step S103).
The flat wire is fed using a feed mechanism or the like to a position where the next bending of the flat wire D is performed (step S104).

  The bending process of the above (step S101) thru | or (step S104) is repeated, and a square edgewise coil is wound.

  By the way, oil is usually attached to the surface of the flat wire, and the amount of oil varies depending on the transport of the flat wire, temperature, storage state, and the like. Conventionally, for example, when the amount of oil is small, the frictional force between the flange member and the center guide and the side surface of the flat wire increases. Furthermore, when the flat wire is bent, a bent bulge portion in which the width of the short side is increased by bending is generated in the bent portion of the flat wire. Therefore, the bending bulge part may be insufficiently pressed by the bending piece due to an increase in frictional force due to swelling and an increase in frictional force due to a small amount of oil, resulting in insufficient bending of the rectangular wire. There is a risk of doing.

  On the other hand, the rectangular wire bending apparatus 1 according to the first embodiment includes the rotation mechanism that rotates the flange member 2 and the rotating portion 33 of the center guide 3 in conjunction with the rotation of the bending piece 5 as described above.

  Accordingly, when the bending piece 5 is rotated and the rectangular wire D is bent, the flange member 2 and the rotating portion 33 of the center guide 3 are rotated in conjunction with the bending piece 5, whereby the lower surface of the flange member 2 and the center guide 3. The both sides of the long side of the flat wire D can be sandwiched from above and below with the top surface of the rotating portion 33, and the sandwiched portion can be bent in that state. Therefore, generation | occurrence | production of the above bending bulge parts can be suppressed and the frictional force between the rotation part 33 of the flange member 2 and the center guide 3, and the side surface of the flat wire D can be suppressed small. Therefore, the bending by the bending piece 5 is not insufficient, and the flat wire D is not insufficiently bent. That is, the frictional force between the rotating part 33 (holding member) of the flange member 2 and the center guide 3 and the side surface of the flat wire D can be suppressed, and stable flat wire bending can be realized.

Here, the rotation mechanism described above will be described in detail.
A convex portion 41 is formed on the outer peripheral surface of the shaft member 4. A concave portion 35 is formed on the inner peripheral surface of the center hole of the rotating portion 33 of the center guide 3 so as to correspond to the convex portion 41 of the shaft member 4. When the convex portion 41 of the shaft member 4 and the concave portion 35 of the rotating portion 33 are fitted, the shaft member 4 and the rotating portion 33 rotate integrally. Further, as described above, the flange member 2 and the shaft member 4 are integrally formed. Accordingly, the rotating portion 33 of the flange member 2, the shaft member 4, and the center guide 3 is pivotally supported by the bearing portion 32 fixed to the base portion 31 and rotates integrally.

  In addition, although the convex part 41 is formed in the shaft member 4 and the concave part 35 is formed in the rotation part 33, it is not limited to this. For example, a concave portion may be formed on the shaft member 4 and a convex portion may be formed on the rotating portion 33, and any configuration may be used as long as the shaft member 4 and the rotating portion 33 can rotate together.

  The bending piece 5 has an L-shaped cross section. A concave portion 51 is formed on the upper surface near the tip of the bending piece 5. A convex part 21 is formed on the lower surface of the flange member 2 so as to correspond to the concave part 51 of the bending piece 5. When the concave part 51 of the bending piece 5 and the convex part 21 of the flange member 2 are fitted, the bending piece 5 and the flange member 2 rotate integrally. Therefore, when the bending piece 5 rotates, the bending piece 5, the flange member 2, the shaft member 4, and the rotating portion 33 of the center guide 3 rotate together.

  In addition, although the concave part 51 is formed in the bending piece 5, and the convex part 21 is formed in the flange member 2, it is not limited to this. For example, a convex portion may be formed on the bending piece 5 and a concave portion may be formed on the flange member 2, and any configuration may be used as long as the bending piece 5 and the flange member 2 can rotate together.

  The width of the tip of the bending piece 5 is equal to or smaller than the width of the short side of the flat wire D. Accordingly, when the lower surface of the flange member 2 and the upper surface of the rotating portion 33 of the center guide 3 are sandwiched on both sides on the long side of the flat wire D from the vertical direction, and the bent portion is bent, Interference with the rotating part 33 of the center guide 3 can be avoided.

  4A and 4B are top views showing a positional relationship among the bending piece, the convex portion of the flange member, and the convex portion of the shaft member. As shown in FIG. 4A, when the bending piece 5 is at the 0 ° position, the convex portion 21 of the flange member 2 is at the 0 ° position, and the convex portion 41 of the shaft member 4 is at the 180 ° position. It is in. As shown in FIG. 4B, when the bending piece 5 is rotated to the 90 ° position, the convex portion 21 of the flange member 2 is rotated to the 90 ° position, and the convex portion 41 of the shaft member 4 is 270. Rotate to the position of °. Note that the bending piece 5 actually rotates to an angle slightly larger than 90 ° (about 95 °) in consideration of the spring back of the flat wire D. As described above, the rotation mechanism is configured, and the rotation member 33 of the flange member 2 and the center guide 3 rotates in conjunction with the rotation of the bending piece 5.

As described above, the flat wire bending device 1 according to the first embodiment includes the rotation mechanism that rotates the rotating member 33 of the flange member 2 and the center guide 3 in conjunction with the rotation of the bending piece 5.
Thereby, the both sides | surfaces by the side of the long side of the flat wire D can be pinched | interposed from the up-down direction with the lower surface of the flange member 2, and the upper surface of the rotation part 33 of the center guide 3, and the pinched part can be bent. . Therefore, generation | occurrence | production of the above-mentioned bending bulge part can be suppressed, the frictional force between the rotation part 33 of the flange member 2 and the center guide 3, and the side surface of the flat wire D can be suppressed small, and stable flat wire bending. Can be realized.

Embodiment 2
FIG. 5 is a cross-sectional view showing a schematic configuration of a flat wire bending apparatus according to the second embodiment. In the flat wire bending device 11 according to the second embodiment, the bending piece 7 that bends the flat wire D functions as a holding member that holds both side surfaces on the long side of the flat wire D and rotates itself. A function as a rotation mechanism that rotates the holding member in conjunction with each other is included.

  The shaft member 9 and the disc-shaped flange member 8 are integrally formed. The shaft member 9 is formed with a first convex portion 91 with which one side surface on the short side of the flat wire D abuts.

  The center guide 10 is formed in a substantially umbrella shape. A through hole 101 is formed in the axial direction in a substantially central portion of the center guide 10. A shaft member 9 is inserted into the through hole 101 of the center guide 10. A second convex portion 92 is formed on the outer peripheral surface of the shaft member 9. A concave portion 102 is formed on the inner peripheral surface of the through hole 101 of the center guide 10 corresponding to the second convex portion 92 of the shaft member 9. The convex portion 92 of the shaft member 9 and the concave portion 102 of the center guide 10 are fitted. As a result, the shaft member 9 is prevented from rotating by receiving a rotational force from the flat wire D, as will be described later.

  The bending piece 7 is held so as to sandwich both side surfaces on the long side of the flat wire D. Furthermore, the bending piece 7 maintains its holding state, presses the other side surface on the short side of the flat wire D, and presses the one side surface on the short side with respect to the first convex portion 91 of the shaft member 9. The rectangular wire D is bent according to the curved surface of the first convex portion 91 of the shaft member 9 by rotating along the outer periphery of the shaft member 9 while pressing.

  The tip of the bending piece 7 is sandwiched between the lower surface of the flange member 8 and the upper surface of the center guide 10. The bending piece 7 is provided at the main body portion 71, the first clamp portion 72 that is provided at the distal end portion of the main body portion 71 and presses the upper surface on the long side of the flat wire D downward, and the distal end portion of the main body portion 71. And a second clamp part 73 that presses the lower surface of the long side of the flat wire D upward. The end surface of the main body portion 71 presses one side surface on the short side of the flat wire D against the first convex portion 91 of the shaft member 9. The upper surface of the first clamp portion 72 is pressed downward by the lower surface of the flange member 8. The lower surface of the second clamp portion 73 is pressed upward by the upper surface of the center guide 10.

  6A and 6B are top views showing the positional relationship between the bending piece and the convex portion of the shaft member. As shown in FIG. 6A, when the bending piece 7 is at a position of 0 °, the second convex portion 92 of the shaft member 9 is at a position of 270 °. As shown in FIG. 6B, even if the bending piece 7 rotates to the 90 ° position, the second convex portion 92 of the shaft member 9 remains at the 270 ° position and does not change.

The main body 71 of the bending piece 7 is provided with a spring 74 that urges the first clamp portion 72 upward. The flange member 8 presses the first clamp portion 72 downward against the urging force of the spring 74, so that the first and second clamp portions 72, 73 have side surfaces on the long side of the rectangular wire D. The clamped state is sandwiched from above and below (FIG. 7A). On the other hand, when the flange member 8 stops pressing the first clamp part 72 and opens the first clamp part 72, the first clamp part 72 moves upward by the urging force of the spring 74. Thereby, a gap is generated between the lower surface of the first clamp part 72 and the upper surface on the long side of the flat wire D, and the flat wire D is in an unclamped state released from the first and second clamp parts 72 and 73. (FIG. 7B).
In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As described above, according to the second embodiment, when the bending piece 7 is rotated and the flat wire D is bent, the flat wire D is formed between the lower surface of the first clamp portion 72 and the upper surface of the second clamp portion 73 of the bending piece 7. Both side surfaces on the long side can be sandwiched from above and below, and the portion sandwiched in the sandwiched state can be pressed and bent by the end surface of the main body 71. Therefore, generation | occurrence | production of the above bending bulge parts can be suppressed and the frictional force between the bending piece 7 and the side surface of the flat wire D can be suppressed small. Therefore, the bending by the bending piece 7 is not insufficient, and the flat wire D is not insufficiently bent. That is, the friction force between the bending piece 7 (holding member) and the side surface of the flat wire D is suppressed, and stable flat wire bending can be realized.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

1 Flat wire bending device, 2 flange member, 3 center guide, 4 shaft member, 5 bending piece, 6 backup member, 7 bending piece, 8 flange member, 9 shaft member, 10 center guide, 11 flat wire bending device, 21 convex Part 31, base part 32 bearing part 33 rotating part 34 hole part 35 concave part 41 convex part 51 concave part 71 body part 72 first clamp part 73 second clamp part 74 spring , 81 convex portion, 91 first convex portion, 92 second convex portion, 101 through hole, 102 concave portion

Claims (1)

A rectangular wire bending apparatus for bending a rectangular wire with a cross-sectional shape to form a coil,
A holding member that holds both the side surfaces on the long side of the rectangular wire, and
A shaft member with which one side surface on the short side of the rectangular wire contacts,
By pressing the other side surface on the short side of the rectangular wire and rotating along the outer periphery of the shaft member while pressing one side surface on the short side against the outer peripheral surface of the shaft member, A bending member that bends the flat wire according to the curved surface of the outer peripheral surface of the shaft member;
A rotation mechanism that rotates the holding member in conjunction with rotation of the bending member;
Comprising
A flat wire bending apparatus.

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