Bending device and production method for edgewise-bent rectangular wire

Abstract

To provide a bending device and a production method that can produce an edgewise-bent rectangular wire while effectively preventing or reducing scratches and dimensional variation.SOLUTION: A bending device according to the present invention comprises coaxial first and second supports that can move relative to each other in the axial direction so as to approach into a work position and separate into a standby position, a revolving jig that is revolvingly driven around one of the first and second supports, and a receiving jig that is supported on the other of the first and second supports. When a rectangular wire is engaged in an annular engagement groove that is formed by the positioning of the first and second supports in the work position, the revolving jig is revolvingly driven to perform edgewise bending that winds the rectangular wire onto the receiving jig. The receiving jig is supported on the corresponding support so as to be capable of axial rotation.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an apparatus for bending a rectangular wire edgewise, and a method for manufacturing an edgewise bent rectangular wire in which at least a portion is bent in the edgewise direction. [Background technology]

[0002] Edgewise bending, in which a rectangular wire whose cross-sectional shape is rectangular defined by first and second short sides and first and second long sides is bent in an edgewise direction with the first or second short side on the inside of the bend, is used in manufacturing bus bars formed from rectangular wire having an edgewise bent portion, edgewise coils formed by winding rectangular wire into a coil shape, etc.

[0003] For example, a winding device for manufacturing edgewise coils has been proposed (hereinafter referred to as the conventional device) which includes a main shaft that is movable up and down and rotatable around its axis, a cylindrical member that is fixed to a fixed base while being inserted onto the main shaft, a core bar fixed to the lower end of the cylindrical member, a clamping member that is integrally provided on the lower end of the main shaft so as to face the lower end surface of the core bar and cooperates with the core bar to hold the flat wire, which is the workpiece, in the thickness direction, and an orbital roller that is rotated around the axis of the main shaft radially outward of the core bar and the clamping member (see Patent Document 1 below).

[0004] The core metal has a disk portion having a through hole through which the main shaft is inserted, and an annular protrusion protruding downward in a stepped manner from a radially outer portion of the disk portion.

[0005] The clamp member has a radially outer region facing the annular convex portion and a radially inner region protruding upward in a stepped manner from a radially inner end portion of the radially outer region, and the radially outer region forms an annular recess that engages with the annular convex portion.

[0006] The annular convex portion and the annular concave portion are arranged opposite each other and spaced apart vertically by a distance corresponding to the thickness of the flat wire which is the workpiece, and a U-shaped groove which opens radially outward is formed by the annular convex portion, the annular concave portion and the outer peripheral surface of the radially inner region of the clamping member.

[0007] In the conventional device, the flat wire is held in the U-shaped groove with one short side (e.g., the first short side) facing the radially inner region of the clamping member and clamped in the thickness direction by the annular convex portion and the annular concave portion, and in this state, the revolving roller is driven to rotate around the axis of the main shaft, thereby bending the flat wire edgewise so that one short side (e.g., the first short side) is wrapped around the outer peripheral surface of the radially inner region of the clamping member.

[0008] The conventional device having such a configuration is useful in that the deformation of the cross-sectional shape of the rectangular wire during edgewise bending can be suppressed to a certain extent because the rectangular wire is bent edgewise while being clamped in the thickness direction.

[0009] However, since all of the components forming the U-shaped groove are fixed around the axis of the main shaft, a large frictional force is applied to the flat wire during edgewise bending, which may result in scratches and dimensional variations in the edgewise bent flat wire. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] JP 2013-004873 A Summary of the Invention [Problem to be solved by the invention]

[0011] The present invention has been developed in consideration of such conventional technology, and aims to provide a bending device that can bend a rectangular wire in an edgewise direction while effectively preventing or reducing defects and dimensional variations, and a method for manufacturing an edgewise bent rectangular wire. [Means for solving the problem]

[0012] In order to achieve the above object, the present invention provides a bending device for edgewise bending a rectangular wire having a cross-sectional shape defined by first and second short sides opposed to each other and first and second long sides opposed to each other, the bending device comprising: a first support having an end face facing an axial direction; a second support having an end face facing an axial direction and arranged coaxially with the first support; a revolution jig that is driven to revolve along an outer circumferential surface of a revolution jig side support that is one of the first and second supports; and a receiving jig supported by a receiving jig side support that is the other of the first and second supports, the first and second supports being movable relative to each other in the axial direction so as to be able to take a working position in which the end faces of the first and second supports are close to each other and a standby position in which the end faces are spaced apart, and the receiving jig is driven to be spaced apart from the end of the revolution jig side support by a distance corresponding to a plate thickness of the rectangular wire defined by the distance between the first and second long sides when the first and second supports are positioned at the working position. and an axially extending annular portion extending in the axial direction from a radially inner end of the radially extending annular surface toward a direction approaching an end face of the revolution jig side support, and when the first and second supports are positioned at a working position, the end face of the revolution jig side support, the radially extending annular surface, and the axially extending annular portion form an annular engagement groove that opens radially outward, and the revolution jig is configured such that the first long side faces the end face of the revolution jig side support, and The present invention provides a bending device configured such that, when the flat wire is engaged in the annular engagement groove so that the two long sides face the radially extending annular surface and the first short side faces the outer peripheral surface of the axially extending annular portion and is driven to revolve in a state ready for bending, the second short side is pressed so as to wrap the first short side around the axially extending annular portion, thereby bending the flat wire edgewise, and the receiving jig is supported on the receiving jig side support so as to be rotatable about an axis.

[0013] Preferably, the receiving jig has a tip portion extending from the axially extending annular portion toward the axial tip side, and a bearing hole is provided on an end face of the revolving jig support body, and when the first and second supports are positioned at the working position, the tip portion is engaged with the bearing hole so as to be freely rotatable about the axis.

[0014] In a first form, the first support acts as the revolution jig side support and the second support acts as the receiving jig side support, and the second support is vertically movable to take a lowered position that defines the working position and an elevated position that defines the standby position.

[0015] In a second form, the first support acts as the receiving jig side support and the second support acts as the revolution jig side support, and the second support is capable of moving in the vertical direction so as to take a lowered position that defines the working position and an elevated position that defines the standby position.

[0016] In the various configurations described above, the receiving jig is supported on the receiving jig side support via a bearing member having an inner ring body, an outer ring body, and a rolling element interposed between the inner ring body and the outer ring body. Preferably, the bearing member is a cross roller bearing.

[0017] For example, the inner race is connected to the receiving jig, and the outer race is connected to a receiving jig side support body. Alternatively, the inner race body may be connected to the receiving jig support, and the outer race body may be connected to the receiving jig.

[0018] In a first aspect, the revolution jig may have a main body including an opposing portion that faces the outer peripheral surface of the revolution jig side support and a pressing portion that extends axially outward from the revolution jig side support and presses the side of the second short side of the rectangular wire, and a cover portion that is connected to the main body so as to be swingable around a swing axis.

[0019] The cover portion is configured to be capable of taking a holding position that covers at least a portion of the flat wire that is located radially outward from the radially extending annular surface when the flat wire is engaged in the annular engagement groove and is ready for bending, and a retracted position that does not overlap with the flat wire that is ready for bending when viewed in a plan view.

[0020] In the second embodiment, the radial length of the installation area on the end face of the revolution jig side support where the rectangular wire is installed is the same as the width of the rectangular wire defined by the distance between the first and second short sides, and the radially extending annular surface is configured so that the radially inner end is located at the same radial position as the radially inner end of the installation area, and the radially outer end is located at the same radial position as the radially outer end of the installation area or extends radially outward from the radially outer end of the installation area. In this case, the revolution jig has a facing portion facing the outer circumferential surface of the revolution jig side support, and a pressing portion extending from the facing portion so as to be located axially outward from the revolution jig side support and pressing the second short side of the rectangular wire, and the pressing portion has a length equal to or less than the plate thickness of the rectangular wire defined by the distance between the first and second long sides.

[0021] Preferably, a radially outer end of the radially extending annular surface is located at the same radial position as a radially outer end of the mounting region.

[0022] Preferably, the pressing portion is configured to have a length equal to or greater than half the plate thickness of the rectangular wire.

[0023] More preferably, the pressed portion is configured to have a length that is equal to or greater than 1 / 2 and equal to or less than 4 / 5 of the plate thickness of the rectangular wire.

[0024] The present invention also relates to a method for manufacturing an edgewise bent rectangular wire by bending at least a part of the rectangular wire, the cross-sectional shape of which is rectangular and defined by first and second short sides opposed to each other and first and second long sides opposed to each other, in an edgewise direction using a bending device having a first support having an upper end surface, a second support having a lower end surface and arranged coaxially with the first support, a revolving jig driven to revolve along an outer circumferential surface of the first support, and a receiving jig supported by the second support, is movable in the axial direction so as to take a working position where the upper end surface of the first support and the lower end surface of the second support are close to each other and a standby position where the upper end surface and the lower end surface are spaced apart, the receiving jig is supported by the second support so as to be rotatable about the axis, and when the second support is positioned at the working position, the receiving jig has a radially extending annular surface that faces at least a part of the upper end surface of the first support while being spaced apart by a distance corresponding to the plate thickness of the rectangular wire defined by the distance between the first and second long sides, and and an axially extending annular portion extending in the axial direction from a radially inner end of the first support toward a direction approaching an upper end surface of the first support, and when the second support is located at a working position, an installation area of ​​the upper end surface of the first support where the rectangular wire is installed, the radially extending annular surface, and the axially extending annular portion are configured to form an annular engagement groove that opens radially outward, and the manufacturing method includes, when the second support is located at a standby position, installing the rectangular wire before bending in the installation area of ​​the upper end surface of the first support. the second support is moved from a waiting position to a working position with the flat wire set in the setting area to produce a state in which the flat wire is engaged with the annular engagement groove before bending and is ready for bending; and an edgewise bending process in which the revolving jig is driven to revolve along the outer circumferential surface of the first support to press the second short side with a pressing portion of the revolving jig so that the first short side is wound around the axially extending annular portion.

[0025] In one embodiment, the revolution jig has a main body having a pressing portion that is opposed to the outer peripheral surface of the first support and that extends upward from the first support to press the second short side of the rectangular wire, and a lid that is connected to the main body so as to be swingable around a swing axis, and the lid is configured to be able to take a holding position that covers at least a part of the part of the rectangular wire located radially outward from the radially extending annular surface in the bending preparation completed state, and a retracted position that does not overlap with the rectangular wire in the bending preparation completed state in a plan view. In this case, the manufacturing method may include a flat wire radial outer part holding step of moving the lid from the retracted position to a holding position after the step of making the bending preparation completed state appear, and using the lid to cover at least a part of the part of the rectangular wire located radially outward from the radially extending annular surface.

[0026] In another aspect, the installation area has a radial length equal to the width of the rectangular wire defined by the distance between the first and second short sides, the radially extending annular surface has a radially inner end at the same radial position as the radially inner end of the installation area, and a radially outer end at the same radial position as the radially outer end of the installation area or extending radially outward from the radially outer end of the installation area, the revolution jig has a facing portion facing the outer circumferential surface of the first support and a pressing portion extending from the facing portion to be located above the first support and pressing the second short side of the rectangular wire, the pressing portion having a length equal to or less than the plate thickness of the rectangular wire defined by the distance between the first and second long sides. In this case, the edgewise bending process is performed in a state where the entire width of the rectangular wire is covered by the radially extending annular surface and the installation area. Effect of the Invention

[0027] According to the bending device of the present invention, it is possible to bend a rectangular wire in an edgewise direction while effectively preventing or reducing defects and dimensional variations. Furthermore, according to the method for manufacturing an edgewise bent rectangular wire of the present invention, it is possible to efficiently manufacture an edgewise bent rectangular wire in which defects and dimensional variations are effectively prevented or reduced. [Brief description of the drawings]

[0028] [Figure 1] FIG. 1 is a vertical sectional front view of a bending device according to a first embodiment of the present invention, showing a state in which first and second supports are positioned at a working position and a revolution jig is positioned at an initial position. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] FIG. 3 is an enlarged view of part III in FIG. [Figure 4] FIG. 4 is a vertical sectional front view of the bending device in a state where the first and second supports are located at standby positions. [Diagram 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a vertical sectional side view of the bending apparatus in a state in which the revolution jig has been revolved 90° around the axis of the first support from an initial position. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. [Figure 8] FIG. 8 is a cross-sectional view corresponding to FIG. 7, showing a state in which the revolution jig has been revolved 180° around the axis of the first support from the initial position. [Figure 9] FIG. 9 is a vertical sectional front view of a bending device according to a first modified example of the first embodiment, showing a state in which the first and second supports are positioned at the working position and the revolution jig is positioned at the initial position. [Figure 10] FIG. 10 is a vertical sectional front view of the bending device according to the first modified example, showing a state in which the first and second supports are positioned at the standby position and the revolution jig is positioned at the initial position. [Figure 11]FIG. 11 is a vertical sectional front view of a bending device according to a second modified example of the first embodiment, showing a state in which the first and second supports are positioned at the working position and the revolution jig is positioned at the initial position. [Figure 12] FIG. 12 is a vertical sectional front view of the bending apparatus according to the second modified example, showing a state in which the first and second supports are positioned at the standby position and the revolution jig is positioned at the initial position. [Figure 13] FIG. 13 is a vertical sectional front view of a bending apparatus according to a second embodiment of the present invention, showing a state in which the first and second supports are positioned at the working position and the revolution jig is positioned at the initial position. [Figure 14] FIG. 14 is a cross-sectional view taken along line XIV-XIV in FIG. [Figure 15] FIG. 15 is an enlarged view of the portion XV in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] First embodiment DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a bending device according to the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a vertical sectional front view of a bending device 1 according to this embodiment. FIG. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 3 shows an enlarged view of part III in FIG.

[0030] The bending apparatus 1 is an apparatus for bending a rectangular wire 90A whose cross-sectional shape is rectangular and defined by first and second short sides 92a, 92b opposing each other and first and second long sides 94a, 94b opposing each other, whose width W (see FIG. 2) is defined by the distance between the first and second short sides 92a, 92b and whose thickness T (see FIG. 3) is defined by the distance between the first and second long sides 94a, 94b, in an edgewise direction with one of the first and second short sides 92a, 92b (for example, the first short side 92a) on the inside of the bend and the other (for example, the second short side 92b) on the outside of the bend.

[0031] Specifically, as shown in Figures 1 to 3, the bending apparatus 1 includes a first support 10 having an upper end surface 12, a second support 20 arranged coaxially with the first support 10 so that a lower end surface 22 faces an upper end surface 11 of the first support 10, a revolution jig 30 that is driven to revolve along the outer circumferential surface of a revolution jig side support that is one of the first and second supports 10, 20, and a receiving jig 50A supported by a receiving jig side support that is the other of the first and second supports 10, 20.

[0032] The first and second supports 10, 20 are movable relative to each other in the axial direction so as to be able to assume a working position in which the upper end surface 12 of the first support 10 and the lower end surface 22 of the second support 20 are close to each other, and a standby position in which the upper end surface 12 and the lower end surface 22 are spaced apart.

[0033] In this embodiment, the first support 10 is fixed in the axial direction, and the second support 20 is movable in the vertical direction so as to assume a lowered position that reveals the working position and an elevated position that reveals the standby position. FIG. 1 shows a state in which the second support 20 is located at a lowered position.

[0034] FIG. 4 shows a vertical sectional front view of the bending device 1 in a state where the second support 20 is positioned at the raised position where the standby position is revealed. FIG. 5 shows a cross-sectional view taken along line VV in FIG.

[0035] As shown in FIGS. 1 to 5, in this embodiment, the first support 10 acts as the revolution jig side support, and the second support 20 acts as the receiving jig side support.

[0036] As shown in FIG. 3, when the first and second supports 10, 20 are positioned at the working position, the receiving jig 50A has a radially extending annular surface 52 that faces at least a portion of the end face of the revolution jig side support (in this embodiment, the upper end face 12 of the first support 10) while being spaced a distance corresponding to the plate thickness T of the flat wire 90A defined by the distance between the first and second long sides 94a, 94b, and an axially extending annular portion 54 that extends in the axial direction from the radial inner end of the radially extending annular surface 52 in a direction approaching the end face of the revolution jig side support (in this embodiment, the upper end face 12 of the first support 10).

[0037] With this configuration, when the first and second supports 10, 20 are positioned in the working position, the end face of the revolution jig side support (in this embodiment, the upper end face 12 of the first support 10), the radially extending annular surface 52 and the axially extending annular portion 54 form an annular engagement groove 80 (see Figure 3) that opens radially outward.

[0038] In the bending preparation completed state (the state shown in Figures 1 to 3) in which the flat wire 90A is engaged in the annular engagement groove 80 so that the first long side 94a faces the end face of the revolution jig side support (in this embodiment, the upper end face 12 of the first support 10), the second long side 94b faces the radially extending annular surface 52, and the first short side 92a faces the outer peripheral surface of the axially extending annular portion 54, when the revolution jig 30 is driven to revolve around the axis of the revolution jig side support (in this embodiment, the first support 10), the revolution action of the revolution jig 30 presses the second short side 92b side so that the first short side 92a side is wound around the axially extending annular portion 54, thereby bending the flat wire 90A in the edgewise direction to form an edgewise bent flat wire 90B (see Figures 6 and 7 below).

[0039] In this way, the bending apparatus 1 of this embodiment is configured so that, while three sides (the first short side 92a, the first long side 94a and the second long side 94b) of the rectangular cross section of the flat wire 90A are restricted by the outer surface of the axially extending annular portion 54, the end face of the revolution jig side support (in this embodiment, the upper end surface 12 of the first support 10) and the radially extending annular surface 52, the remaining side (i.e., the second short side 92b) of the rectangular cross section of the flat wire 90A is pressed edgewise by the revolution jig 50A, thereby effectively preventing or reducing deformation of the rectangular cross section of the edgewise bent flat wire 90B from the cross-sectional shape of the flat wire 90A before processing.

[0040] FIG. 6 is a vertical sectional side view showing a state in which the revolution jig 30 has been revolved 90° from the initial position along the outer circumferential surface around the axis of the revolution jig side support (the first support 10 in this embodiment). FIG. 7 shows a cross-sectional view taken along line VII-VII in FIG.

[0041] In this embodiment, as shown in FIG. 3, the revolution jig 30 has an opposing portion 32 that faces the outer peripheral surface of the revolution jig side support (the first support 10 in this embodiment), and a pressing portion 33 that extends axially outward from the revolution jig side support (the first support 10 in this embodiment) and presses the second short side 92b of the rectangular wire 90A. By revolving around the axis of the revolution jig support (the first support 10 in this embodiment) from the initial position (the position of the revolution jig 30 shown by a dotted line in FIG. 7) to the bending completion position (the position of the revolution jig 30 shown by a solid line in FIG. 7), the pressing portion 33 presses the second short side 92b of the rectangular wire 90A in a direction approaching the first short side 92a, thereby bending the rectangular wire 90A in the edgewise direction with the first short side 92a on the inside of the bend.

[0042] The revolution angle of the revolution jig 30 from the initial position to the bending completion position is appropriately set according to the bending angle of the edgewise bent portion to be formed in the rectangular wire 90A. FIG. 8 shows a cross-sectional plan view of the revolving jig 30 when rotated 180° around the axis of the revolving jig side support (the first support 10 in this embodiment) from the initial position shown by the dashed double-dashed line to the bending completion position shown by the solid line (i.e., when the revolving angle is set to 180°).

[0043] As shown in Figure 3, in this embodiment, the revolution jig 30 has a main body portion 31 having the opposing portion 32 and the pressing portion 33, and a lid portion 35 connected to the main body portion 31 so as to be swingable around the swing axis.

[0044] The cover portion 35 is configured to be able to take a holding position (see solid line in Figure 1 and Figure 3) in which it covers at least a portion of the second long side 94b of the flat wire 90A that is located radially outward from the radially extending annular surface 52 when the flat wire 90A is engaged in the annular engagement groove 80 and is ready for bending, and a retracted position (see dotted line in Figure 1 and Figure 4) in which it does not overlap with the flat wire 90A that is ready for bending when viewed in a plane.

[0045] With this configuration, deformation of the rectangular cross section of the edgewise bent rectangular wire 90B during edgewise bending can be more effectively prevented or reduced.

[0046] As shown in FIG. 3 and other figures, in the bending apparatus 1, the receiving jig 50A is supported by the receiving jig side support body (the second support body 20 in this embodiment) so as to be rotatable about an axis.

[0047] With this configuration, the receiving jig 50A rotates around the axis due to the frictional force between it and the first edge 92a, which is on the inside of the bend, during edgewise bending processing, thereby preventing excessive frictional force from being applied to the first edge 92a and effectively preventing or reducing the occurrence of scratches and dimensional variations in the edgewise bent flat wire 90B.

[0048] In this embodiment, as shown in Figure 3 etc., the receiving jig 50A is supported on the receiving jig side support (the second support 20 in this embodiment) so as to be freely rotatable around its axis via a bearing member 60 including an inner race 62, an outer race 64, and rolling elements 66 such as balls, rollers or rollers interposed between the inner race 62 and the outer race 64.

[0049] In this embodiment, the bearing member 60 is a cross roller bearing in which a plurality of rollers are arranged perpendicular to each other as the rolling elements 66 .

[0050] In this embodiment, as shown in Figures 1, 3, and 4, the inner race 62 is connected to the receiving jig 50A, and the outer race 64 is connected to the receiving jig side support body (the second support body 20 in this embodiment).

[0051] 9 and 10 are longitudinal sectional front views of the bending apparatus 2 according to a first modified example of the present embodiment. Fig. 9 and Fig. 10 respectively show the working position (the lowered position of the second support 20) and the waiting position (the raised position of the second support 20). In the drawings, the same members or parts as those in this embodiment are denoted by the same reference numerals.

[0052] The bending apparatus 2 according to the first modified example is different from the bending apparatus 1 in that it has a receiving jig 50B instead of the receiving jig 50A. The receiving jig 50B is configured to be connected to the outer race 64.

[0053] That is, in the first modified example 2, as shown in Figures 9 and 10, the inner race body 62 is connected to the receiving jig side support body (the second support body 20), and the outer race body 64 is connected to the receiving jig 50B.

[0054] Naturally, instead of the bearing members 50A, 50B, the receiving jigs 50A, 50B can be supported by the receiving jig side support body so as to be rotatable about their axes via other rotation-permitting support mechanisms such as rollers.

[0055] In addition, in this embodiment and the first modified example, the receiving jigs 50A, 50B have a tip portion 56 extending from the axially extending annular portion 54 toward the axial tip side, and a bearing hole 13 is provided in the end face of the revolution jig support body (the upper end surface 12 of the first support body 10).

[0056] As shown in Figures 1 and 9, etc., the tip portion 56 is configured to be freely rotatable about the axis when the first and second supports 10, 20 are positioned at the working position (in this embodiment and the first modified example, when the second support 20 is positioned at the lowered position).

[0057] According to such a configuration, the posture of the receiving jigs 50A, 50B can be stabilized during edgewise bending, and the occurrence of defects and dimensional variations in the edgewise bent rectangular wire 90B can be more effectively prevented or reduced.

[0058] Hereinafter, a method for producing an edgewise bent rectangular wire 90B using the bending apparatus 1 according to the present embodiment will be described.

[0059] The manufacturing method includes a rectangular wire setting step, a bending preparation completion step, and an edgewise bending step.

[0060] The flat wire installation process (Figures 4 and 5) is configured to install the flat wire 90A before bending in an installation area (i.e., a groove area that will form the annular engagement groove 80) of the upper end surface 12 of the first support 10 where the flat wire 90A is to be installed, when the second support 20 is positioned in a raised position.

[0061] In detail, the rectangular wire 90A is bent in an edgewise direction by the revolving jig 30 which is driven to revolve in a state where the rectangular wire 90A is engaged in the annular engagement groove 80 and is ready for bending. When the bending process is ready, the flat wire 90A is in a state in which the first long side 94a, the second long side 94b, and the first short side 92a face the upper end surface 12 of the first support 10, the radially extending annular surface 52, and the axially extending annular portion 54, respectively.

[0062] In other words, the flat wire installation process is configured to install the flat wire 90A in a state where the first long side 94a is in contact with the installation area (the groove planned area forming the annular engagement groove 80) of the upper end surface 12 of the first support 10 when the second support 20 is positioned in the raised position, so that a bending-ready state in which the flat wire 90A is engaged with the annular engagement groove 80 appears as the second support 20 transitions from the raised position to the lowered position.

[0063] The bending preparation completion process (Figures 1 to 3) is configured to move the second support 20 from a raised position to a lowered position with the flat wire 90A placed in the groove intended area, thereby producing a bending preparation completion state in which the flat wire 90A before bending is engaged in the annular engagement groove 80.

[0064] In this embodiment, the manufacturing method includes a flat wire radially outer portion holding process in which, after the bending preparation completion process, the cover portion 35 of the revolution jig 30 is moved from a retracted position (dashed line in Figure 1) to a holding position (solid line in Figure 1) to cover at least a portion of the portion of the second long side 94b of the flat wire 90A that is located radially outward from the radially extending annular surface 52 with the cover portion 35.

[0065] The edgewise bending process is configured to drive the revolving jig 30 to revolve around the axis of the first support 10 from an initial position (dashed line in Figure 7) to a desired bending completion position (solid line in Figure 7), and press the second short side 92b in the edgewise direction by the pressing portion 33 of the revolving jig 30 so that the side of the first short side 92a is wrapped around the axially extending annular portion 54.

[0066] In this embodiment and the first modified example, the first support 10 acts as the revolution jig side support and the second support 20 acts as the receiving jig side support, but the present invention is not limited to such a configuration.

[0067] 11 and 12 are longitudinal sectional front views of a bending apparatus 3 according to a second modified example of the present embodiment, showing the working position and the standby position, respectively. In the drawings, the same members and parts as those in this embodiment and the first modified example are denoted by the same reference numerals.

[0068] As shown in Figures 11 and 12, the bending apparatus 3 according to the second modified example is configured so that the first support 10 acts as a receiving jig side support that supports the receiving jig 50, and the second support 20 acts as a revolving jig side support that supports the revolving jig 30. Therefore, in the bending apparatus 3, a bearing hole 23 into which the tip portion 56 of the receiving jig 50A is engaged so as to be rotatable about an axis is provided in the lower surface 22 of the second support 20.

[0069] In the bending device 3, the first support 10 acting as the receiving jig side support is fixed in the axial direction, and the second support 20 acting as the revolving jig side support is movable in the axial direction. The second support 20 is positioned at a lowered position (FIG. 11) and an elevated position (FIG. 12) to reveal a working position and a waiting position. Alternatively, the first support 10 can be axially movable and the second support 20 can be axially fixed.

[0070] Embodiment 2 Hereinafter, another embodiment of the bending device according to the present invention will be described with reference to the accompanying drawings. FIG. 13 shows a vertical sectional front view of the bending device 4 according to this embodiment. FIG. 14 shows a cross-sectional view taken along line XIV-XIV in FIG. FIG. 15 shows an enlarged view of the portion XV in FIG. In the figure, the same members as those in the first embodiment are given the same reference numerals, and detailed explanations thereof will be omitted as appropriate.

[0071] The bending device 4 in this embodiment is configured to perform edgewise bending of the flat wire 90A while the entire width W of the flat wire 90A is covered by the installation area of ​​the end face of the revolution jig side support (in this embodiment, the upper end face 12 of the first support 10) where the flat wire 90A is installed and the radially extending annular surface 52.

[0072] Specifically, compared to the bending apparatus 1 according to the first embodiment, the bending apparatus 4 according to this embodiment has a receiving jig 50C instead of the receiving jig 50A.

[0073] As in the bending processing apparatus 1 of embodiment 1, the installation area (groove area intended to form the annular engagement groove 80) in which the rectangular wire 90A is installed on the end face of the revolution jig side support (in this embodiment, the upper end face 12 of the first support 10) has a radial length that is the same as the width W of the rectangular wire 90A defined by the distance between the first and second short sides 92a, 92b.

[0074] Like the receiving jig 50A, the receiving jig 50C has the radially extending annular surface 52 that is spaced from the end face of the revolution jig side support (in this embodiment, the upper end surface 12 of the first support 10) by a distance equivalent to the plate thickness T of the flat wire 90A when the first and second supports 10, 20 are positioned at the working position, and the axially extending annular portion 54 that extends in the axial direction from the radial inner end of the radially extending annular surface 52 in a direction approaching the end face of the revolution jig side support (in this embodiment, the upper end surface 12 of the first support 10).

[0075] The receiving jig 50C is the same as the receiving jig 50A in that the radially inner end of the radially extending annular surface 52 is located at the same radial position as the radially inner end of the installation area, but differs from the receiving jig 50A in that the radially outer end of the radially extending annular surface 52 extends radially outward from the radially outer end of the installation area.

[0076] The receiving jig 50C can be deformed so that the radially outer end of the radially extending annular surface 52 is positioned at the same radial position as the radially outer end of the installation region.

[0077] Furthermore, compared to the bending apparatus 1 according to the first embodiment, the bending apparatus 4 according to this embodiment has a revolution jig 30C instead of the revolution jig 30.

[0078] As shown in Figures 13 and 15, the revolution jig 30C is similar to the revolution jig 30 in that it has an opposing portion 32 that faces the outer peripheral surface of the revolution jig side support (the first support 10 in this embodiment), and a pressing portion 33 that extends from the opposing portion 32 so as to be positioned axially outward from the revolution jig side support and presses the side of the second short side 92b of the flat wire 90A.

[0079] On the other hand, the revolution jig 30C differs from the revolution jig 30 in that the lid portion 35 is omitted.

[0080] As shown in FIG. 15, in the revolution jig 30C, the pressing portion 33 is configured to have a length less than the plate thickness T of the rectangular wire 90A defined by the distance between the first and second long sides 94a, 94b.

[0081] In the bending device 4 configured as described above, the flat wire 90A is bent edgewise by the revolving jig 30C with the entire widthwise area of ​​the outer surface on one side in the thickness direction abutting against the installation area on the end face of the revolving jig side support (in this embodiment, the upper end face 12 of the first support 10) and the entire widthwise area of ​​the outer surface on the other side in the thickness direction abutting against the radially extending annular surface 52 of the receiving jig 50C.

[0082] In other words, in this embodiment, the radial outer end edge of the radially extending annular surface 52 does not exist on the outer surface of the flat wire 90A, and therefore, the risk of the outer end edge causing scratches on the outer surface of the flat wire 90A can be effectively prevented.

[0083] Furthermore, in this embodiment, the pressing portion 33 of the revolution jig 30C has a length less than the plate thickness T of the rectangular wire 90A, thereby reliably preventing the revolution jig 30C from colliding with the receiving jig 50C during the revolution operation of the revolution jig 30C.

[0084] Preferably, the pressing portion 33 has a length equal to or greater than 1 / 2 of the plate thickness T of the rectangular wire 90A. According to this configuration, the pressing force based on the revolution of the revolution jig 30C can be effectively applied to the rectangular wire 90A.

[0085] More preferably, the pressing portion 33 has a length equal to or greater than 1 / 2 and equal to or less than 4 / 5 of the thickness of the rectangular wire 90A. According to this configuration, it is possible to reliably prevent the revolution jig 30C from colliding with the receiving jig 50C, while allowing the pressing force based on the revolution operation of the revolution jig 30C to be effectively applied to the rectangular wire 90A.

[0086] Of course, the first and second modified examples can be applied to the bending apparatus 4 according to this embodiment. [Explanation of symbols]

[0087] 1~4 Bending equipment 10 First support 12 Top surface 13 Bearing hole 20 Second support 22 Lower end surface 23 Bearing hole 30, 30C revolution jig 31 Main body 32 Opposite Part 33 Pressure Area 35 Lid member 50A, 50B, 50C Receiving fixture 52 radially extending annular surface 54 Axially extending annular section 56 Tip 60 Bearing materials 62 Inner race 64 Outer wheel 66 Rolling elements 80 Circular engagement groove 90A rectangular wire (before bending) 90B Edgewise bent rectangular wire (after bending) 92a 1st short side 92b 2nd short side 94a First long side 94b 2nd long side

Claims

1. A bending apparatus for bending a rectangular wire edgewise, the rectangular wire having a cross-sectional shape defined by first and second short sides opposed to each other and first and second long sides opposed to each other, a first support having an end surface facing in an axial direction; A second support member having an end surface facing an axial direction and arranged coaxially with the first support member; a revolution jig that is driven to revolve along an outer circumferential surface of a revolution jig side support that is one of the first and second supports; a receiving jig supported by a receiving jig side support which is the other of the first and second supports, the first and second supports are movable relative to each other in an axial direction so as to take a working position in which end surfaces of the first and second supports are close to each other and a standby position in which the end surfaces are spaced apart from each other; the receiving jig has a radially extending annular surface facing at least a part of the end face of the revolution jig side support in a state spaced apart by a distance corresponding to a plate thickness of the rectangular wire defined by the distance between the first and second long sides when the first and second supports are positioned at a working position, and an axially extending annular portion extending in the axial direction from a radially inner end of the radially extending annular surface in a direction approaching the end face of the revolution jig side support, When the first and second supports are positioned at a working position, an end surface of the revolution jig side support, the radially extending annular surface, and the axially extending annular portion are configured to form an annular engagement groove that opens radially outward, When the revolving jig is driven to revolve in a state in which the flat wire is engaged in the annular engagement groove so that the first long side faces the end face of the revolving jig side support, the second long side faces the radially extending annular surface, and the first short side faces the axially extending annular portion, the revolving jig presses the second short side so as to wrap the first short side around the axially extending annular portion, thereby bending the flat wire in an edgewise direction; The bending apparatus is characterized in that the receiving jig is supported by the receiving jig side support body so as to be rotatable about an axis.

2. the receiving jig has a tip portion extending from the axially extending annular portion toward a tip side in the axial direction, A bearing hole is provided on an end surface of the revolution jig support, 2. The bending apparatus according to claim 1, wherein when the first and second supports are positioned at the working position, the tip portions are engaged with the bearing holes so as to be rotatable about their respective axes.

3. The first support member acts as the revolution jig side support member, and the second support member acts as the receiving jig side support member, 3. The bending apparatus according to claim 2, wherein the second support is vertically movable so as to take a lowered position that defines the working position and an elevated position that defines the standby position.

4. The first support member acts as the receiving jig side support member, and the second support member acts as the revolution jig side support member, 3. The bending apparatus according to claim 2, wherein the second support is vertically movable so as to take a lowered position that defines the working position and an elevated position that defines the standby position.

5. 2. The bending apparatus according to claim 1, wherein the receiving jig is supported on the receiving jig side support via a bearing member having an inner ring body, an outer ring body, and a rolling element interposed between the inner ring body and the outer ring body.

6. 6. The bending apparatus according to claim 5, wherein the bearing member is a cross roller bearing.

7. 6. The bending apparatus according to claim 5, wherein the inner race is connected to the receiving jig, and the outer race is connected to a receiving jig side support body.

8. 6. The bending apparatus according to claim 5, wherein the inner race is connected to the receiving jig support body, and the outer race is connected to the receiving jig.

9. The revolution jig has a main body including a facing portion facing an outer circumferential surface of the revolution jig support and a pressing portion extending outward in the axial direction from the revolution jig support and pressing the second short side of the rectangular wire, and a lid portion connected to the main body so as to be swingable about a swing axis, A bending device as described in any one of claims 1 to 8, characterized in that when the rectangular wire is engaged in the annular engagement groove and ready for bending, the cover portion can take a holding position that covers at least a portion of the rectangular wire that is located radially outward from the radially extending annular surface, and a retracted position that does not overlap with the rectangular wire in the ready for bending state when viewed in a plane.

10. The radial length of the installation area in which the rectangular wire is installed on the end surface of the revolution jig side support is set to be the same as the width of the rectangular wire defined by the distance between the first and second short sides, The radially extending annular surface is configured such that a radially inner end is disposed at the same radial position as a radially inner end of the installation area, and a radially outer end is disposed at the same radial position as a radially outer end of the installation area or extends radially outward from the radially outer end of the installation area, The revolution jig has a facing portion facing an outer circumferential surface of the revolution jig side support, and a pressing portion extending from the facing portion so as to be located axially outward from the revolution jig side support and pressing the second short side of the rectangular wire, 9. The bending apparatus according to claim 1, wherein the pressing portion has a length equal to or less than a thickness of the rectangular wire defined by a distance between the first and second long sides.

11. The bending apparatus according to claim 10, wherein a radially outer end of the radially extending annular surface is disposed at the same radial position as a radially outer end of the installation area.

12. 11. The bending apparatus according to claim 10, wherein the pressing portion has a length equal to or greater than half the plate thickness of the rectangular wire.

13. 11. The bending apparatus according to claim 10, wherein the pressing portion has a length that is equal to or greater than 1 / 2 and equal to or less than 4 / 5 of the thickness of the rectangular wire.

14. A method for manufacturing an edgewise bent rectangular wire, comprising bending at least a portion of a rectangular wire having a cross-sectional shape defined by first and second short sides opposed to each other and first and second long sides opposed to each other, in an edgewise direction using a bending device having a first support having an upper end surface, a second support having a lower end surface and arranged coaxially with the first support, a revolving jig driven to revolve along an outer circumferential surface of the first support, and a receiving jig supported by the second support, the second support is movable in the axial direction so as to take a working position in which a lower end surface is close to an upper end surface of the first support and a standby position in which the lower end surface is separated from the upper end surface of the first support, The receiving jig is supported by the second support so as to be rotatable about an axis, and has a radially extending annular surface facing at least a portion of the upper end surface of the first support while being spaced apart by a distance corresponding to the thickness of the rectangular wire defined by the distance between the first and second long sides when the second support is positioned at a working position, and an axially extending annular portion extending in the axial direction from a radially inner end of the radially extending annular surface in a direction approaching the upper end surface of the first support, When the second support is positioned at the working position, the installation area of ​​the upper end surface of the first support where the flat wire is installed, the radially extending annular surface, and the axially extending annular portion are configured to form an annular engagement groove that opens radially outward, The manufacturing method includes: A flat wire installation process in which the flat wire before bending is installed in the installation area on the upper end surface of the first support while the second support is positioned at a standby position; A step of moving the second support from the standby position to the working position with the rectangular wire placed in the placement area, so that the rectangular wire before bending is inserted into the annular groove and is ready for bending; and an edgewise bending process in which the revolving jig is driven to revolve along the outer peripheral surface of the first support body, and the second short side is pressed by a pressing portion of the revolving jig so that the first short side is wound around the axially extending annular portion.

15. the revolution jig has a main body having an opposing portion opposing an outer peripheral surface of the first support and a pressing portion extending from the opposing portion so as to be located above the first support and pressing the second short side of the rectangular wire; and a lid portion connected to the main body so as to be swingable about a swing axis; The cover is configured to be capable of taking a holding position in which the cover covers at least a part of the rectangular wire located radially outward from the radially extending annular surface in the bending preparation completed state, and a retracted position in which the cover does not overlap with the rectangular wire in the bending preparation completed state in a plan view, The manufacturing method of the edgewise bent rectangular wire as described in claim 14, characterized in that after the process of making the bending process ready state appear, the manufacturing method includes a process of moving the lid portion from a retracted position to a holding position, and using the lid portion to cover at least a portion of the portion of the rectangular wire that is located radially outward from the radially extending annular surface.

16. The installation area has a radial length equal to the width of the rectangular wire defined by the distance between the first and second short sides, The radially extending annular surface is configured such that a radially inner end is radially aligned with a radially inner end of the installation area, and a radially outer end is radially aligned with a radially outer end of the installation area or extends radially outward from the radially outer end of the installation area, The revolution jig has a facing portion facing an outer peripheral surface of the first support and a pressing portion extending from the facing portion so as to be located above the first support and pressing the second short side of the rectangular wire, The pressing portion has a length equal to or less than a plate thickness of the rectangular wire defined by a distance between the first and second long sides, The method for manufacturing an edgewise bent rectangular wire according to claim 14, characterized in that the edgewise bending process is performed in a state in which the entire width direction of the rectangular wire is covered by the radially extending annular surface and the installation area.

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