JP6939520B2 - Conductor forming equipment - Google Patents

Description

The present disclosure relates to a conductor forming apparatus that forms a bent portion in a conductor.

Conventionally, this type of conductor forming apparatus includes a fixed type, a movable type that rotates about a rotation axis, and a cam mechanism, and includes at least one first bent portion bent in a flatwise direction in the conductor and a flat. It is known that at least one second bent portion bent in the edgewise direction substantially orthogonal to the wise direction and a third bent portion bent in the edgewise direction near the tip of the conductor are formed on the conductor. (See, for example, Patent Document 1). In this conductor forming apparatus, when the movable mold rotates in the first direction around the rotation axis with respect to the fixed mold, the first bending portion of the conductor is formed by the first molding surface of the fixed mold and the second molding surface of the movable mold. Is formed. As the movable die further rotates in the first direction after the first bend is formed, the movable second edgewise bend presses the conductor against the fixed first edgewise bend. As a result, a second bent portion is formed on the conducting wire. When the movable mold further rotates in the first direction after the second bent portion is formed, the fixed mold rotates a little together with the movable mold, and the cam member abuts on the fixed cam follower and rotates to the conductor wire. 3 Bent portions are formed. Further, conventionally, as a coil manufacturing device for manufacturing a coil having a substantially rectangular cross section, a core material support mechanism that rotatably supports the core material around the central axis and a rotary drive mechanism that rotates the core material around the central axis. A pressing mechanism that individually presses the first and second pressing rollers against the conductor wound around the core material to apply pressing force to the conductor, and a first attachment that urges the first pressing roller toward the core material. There is also known one including a urging mechanism and a second urging mechanism for urging the second pressing roller toward the core material (see, for example, Patent Document 2).

JP-A-2017-93197 Japanese Unexamined Patent Publication No. 2015-228393

According to the conductor forming apparatus described in Patent Document 1, the first, second and third bent portions can be formed by rotating the movable mold in one direction. However, the conductor forming apparatus includes a cam mechanism for forming a third bent portion on the tip side, and there is a risk that the cost of the equipment will increase due to the complicated structure. On the other hand, it is conceivable to use a roller as described in Patent Document 2 to form a bent portion at the end of the conducting wire, but when a roller is simply used, the accuracy of the bending angle of the bent portion can be ensured. There is a risk that it will disappear or that the rollers will damage the conductors.

Therefore, it is a main object of the present disclosure to provide a conductor forming apparatus capable of accurately forming a bent portion at an end portion of the conductor without damaging the conductor while suppressing an increase in equipment cost.

The lead wire forming apparatus of the present disclosure is a lead wire forming apparatus in which two molding dies holding a conducting wire and a forming member are relatively moved, and the forming member is pressed against an end portion of the conducting wire to form a bent portion at the end portion. In the above, the molded member is formed on at least one of the two molding dies and the elastic body that urges the molding member toward the end side in response to the contact between the molding member and the end portion of the lead wire. Includes a movement limiting portion that abuts on the molding member when the two molding dies and the molding member move relative to each other and restricts the movement of the molding member toward the end side by the urging force of the elastic body. It's a waste.

In the conductor molding apparatus of the present disclosure, the two molding dies holding the conductor and the molding member are relatively moved, and the molding member urged by the elastic body is pressed against the end of the conductor to form a bent portion at the end. It is what forms. A movement limiting portion is formed in at least one of the two molding dies, and the movement limiting portion comes into contact with the molding member when the two molding dies and the molding member move relative to each other, and the elastic body. The movement of the molded member to the end side (conductor side) due to the urging force of is restricted. As a result, even if the rigidity of the elastic body required for molding the bent portion is sufficiently secured, the movable range of the molded member, that is, the expansion / contraction width of the elastic body is narrowed, and the molded member is changed to the conducting wire according to the displacement of the elastic body. It is possible to prevent the applied pressing force from increasing more than necessary. As a result, it is possible to prevent the molded member urged by the elastic body from excessively pressing the conductor, so that the bent portion is bent excessively or the periphery of the bent portion of the conductor is damaged by the molded member. Can be suppressed. Further, by forming a bent portion at the end of the conducting wire by using a molding member urged by an elastic body, the conducting wire forming apparatus can be used as compared with the case where a molding portion having a cam mechanism or a dedicated driving device is used. It is possible to suppress the complication of the structure and suppress the increase in equipment cost. Therefore, according to the conductor forming apparatus of the present disclosure, it is possible to accurately form a bent portion at the end of the conductor without damaging the conductor while suppressing an increase in equipment cost.

Further, the two molding dies may be a first molding die that can rotate around the axis of rotation and a second molding die that can rotate around the axis of rotation. The first and second molding dies holding the conductors may be integrally rotated around the axis of rotation so that the ends of the conductors are pressed against the molding member. In a wire molding device that presses a conductor against a molding member while rotating two molding dies holding the conductor integrally around the center of rotation, the tip side of the wire that rotates around the center of rotation becomes stronger toward the molding member. It will be pressed. Therefore, by forming the movement limiting portion in at least one of the two molding molds of the conductor forming apparatus, it is possible to suppress excessive bending of the bent portion and damage around the bent portion of the conductor extremely satisfactorily. Become.

Further, the conductor forming apparatus forms at least one of an edgewise bent portion and a flatwise bent portion on the conducting wire by rotating one of the first and second forming molds with respect to the other. It may be present, and at least one edgewise bent portion may be formed by integrally rotating the first and second molding dies around the rotation axis. Further, the conducting wire may be a bus bar portion extending from one end of the coil.

It is a schematic block diagram which shows the conductor forming apparatus of this disclosure. It is a perspective view of the coil including the bus bar part formed by the conductor forming apparatus of this disclosure. It is a top view which shows the 1st molding die of the conductor forming apparatus of this disclosure. It is a perspective view for demonstrating the operation of the conductor forming apparatus of this disclosure. It is a perspective view for demonstrating the operation of the conductor forming apparatus of this disclosure. It is a perspective view for demonstrating the operation of the conductor forming apparatus of this disclosure. It is a perspective view for demonstrating the operation of the conductor forming apparatus of this disclosure. (A), (b) and (c) are schematic diagrams for explaining the operation of the conductor forming apparatus of this disclosure. It is a perspective view for demonstrating the operation of the conductor forming apparatus of this disclosure. It is a perspective view for demonstrating the operation of the conductor forming apparatus of this disclosure.

Next, a mode for carrying out the invention of the present disclosure will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing a conductor forming apparatus 1 of the present disclosure. The conductor forming apparatus 1 shown in the figure is configured to form the bus bar portion B extending from one end of the coil C as shown in FIG. The coil C is a centralized winding type coil formed by winding a flat wire (conductor) having one rectangular cross section in, for example, two rows and a plurality of stages (for example, about 6 to 10 stages) while bending in the edgewise direction. It is a rectangular coil (cassette coil), and is applied to, for example, a three-phase AC motor mounted on an electric vehicle, a hybrid vehicle, or the like. The flat wire is formed by forming an insulating film made of, for example, enamel resin, on the surface of the conductor. The coil C has a substantially square columnar outer shape, and a short lead wire portion (terminal portion) L extends from the other end of the coil C. Further, as shown in the figure, the bus bar portion B extends in a direction close to the lead wire portion L. Further, in the bus bar portion B and the lead wire portion L, the insulating coating of the flat wire is peeled off within a predetermined range on the tip side.

As shown in FIG. 2, the bus bar portion B of the coil C has a plurality of edgewise bent portions (first bending direction: a direction substantially orthogonal to the short side of the cross section of the flat line) bent in the edgewise direction (first bending direction: a direction substantially orthogonal to the short side of the cross section of the flat line). Bent portions) Be1 and Be4, and a plurality of flatwise bent portions (second bent portions) Bf1 and Bf2 bent in the flatwise direction (second bending direction: a direction substantially orthogonal to the long side of the cross section of the flat wire). Has. In the present embodiment, the edgewise bent portion Be1 on the most proximal side (root side) of the bus bar portion BB and the edgewise bent portion Be4 on the most distal end side are bent in opposite directions to each other. Further, the flatwise bent portions Bf1 and Bf2 are formed between the edgewise bent portion Be1 and the edgewise bent portion Be4, and are bent in opposite directions to each other.

As shown in FIG. 1, the conductor forming apparatus 1 includes a first forming die 10 and a second forming die 20 for forming a plurality of flatwise bent portions Bf1 and Bf2 in the bus bar portion B of the coil C, and a bus bar portion B. A tip forming portion 30 for forming an edgewise bent portion Be4 on the free end portion of the above, a coil holding portion 40 for holding the coil C, a first drive device (first drive source) 50 having a drive shaft S1 and the like. The second drive device (second drive source) 60 having the drive shaft S2, the first and second drive devices 50, 60, and the control device 100 for controlling the coil holding unit 40 are included.

As shown in FIG. 1, the first molding die 10 is a lower mold having a mold surface on the upper side in the drawing, and the lower surface (the surface opposite to the mold surface) in the drawing of the first molding die 10 has a mold surface. The tip of the drive shaft S1 of the first drive device 50 is fixed. The second mold 20 is an upper mold having a mold surface capable of covering the mold surface of the first mold 10 on the lower side in the drawing, and the upper surface of the second molding mold 20 in the drawing (opposite to the mold surface). The tip of the drive shaft S2 of the second drive device 60 is fixed to the side surface). The tip forming portion 30 and the coil holding portion 40 are fixed to the installation locations of the conductor forming apparatus 1, respectively. The first drive device 50 is installed below the first molding die 10 in FIG. 1 so that the drive shaft S1 extends coaxially with the rotation axis RA extending in the vertical direction of the installation location of the conductor forming device 1 ( (Fixed). The second drive device 60 is installed (fixed) above the second mold 20 in FIG. 1 so that the drive shaft S2 extends coaxially with the rotation axis RA.

As shown in FIGS. 1 and 3, the first molding die 10 has a pressing surface 10p extending from an end close to the second molding die 20 toward the opposite end, and a bus bar portion of the coil C. The first flatwise forming surface 11 for forming the flatwise bent portions Bf1 and Bf2 on B, and the stepped portion 14 formed so as to extend along the end portion on the side far from the second forming die 20. include. The pressing surface 10p has a substantially fan-shaped planar shape with the rotation axis RA as the central axis, and as it goes from the end near the second molding mold 20 toward the end on the first flatwise molding surface 11 side. It is formed so that the surface shape gradually changes.

The first flatwise molded surface 11 of the first molding die 10 is continuous with the pressing surface 10p, and has a first curved surface (concave curved surface) corresponding to the middle and lower surfaces of FIG. 2 of the flatwise bent portion Bf1 of the bus bar portion B. A second curved surface (convex curved surface) corresponding to the lower surface in FIG. 2 of the flatwise bent portion Bf2 of the bus bar portion B is included. Further, the first flatwise molded surface 11 is a flat surface corresponding to the lower surface of FIG. 2 of the bus bar portion BB between the edgewise bent portion Be1 and the flatwise bent portion Bf1 on the rotation axis RA side of the first curved surface. A flat inclined surface upward in FIG. 1 corresponding to the lower surface of FIG. 2 of the bus bar portion BB between the flatwise bent portion Bf1 and the flatwise bent portion Bf2 between the first curved surface and the second curved surface. On the side opposite to the rotation axis RA of the second curved surface, a flat inclined surface facing downward in FIG. 1 corresponding to the lower surface of FIG. 2 of the bus bar portion BB on the tip side of the flatwise bent portion Bf2 is included. Further, the side surface of the step portion 14 of the first molding die 10 on the second molding die 20 side is a flat surface extending in the radial direction of the first molding die 10.

Further, as shown in FIG. 3, the outer peripheral portion of the first molding die 10 is located below the pressing surface 10p, the first flatwise molding surface 11, and the step portion 14 (drive shaft S1 side). , The roller movement limiting portion 15 is formed. The roller movement limiting portion 15 defines the outer circumference of the pressing surface 10p with the rotation axis RA as the center, and is an arc that intersects the outer peripheral end of the first flatwise molded surface 11 (the end opposite to the rotation axis RA side). It is formed so as to protrude outward in the radial direction of the first molding die 10 from (see the two-dot chain line in FIG. 3). Further, in the present embodiment, the roller movement limiting portion 15 has a flat outer peripheral surface 15s orthogonal to the side surface of the step portion 14 on the second molding mold 20 side.

The second molding die 20 includes a second flatwise molding surface (not shown) for forming the flatwise bent portions Bf1 and Bf2 on the bus bar portion B of the coil C as a mold surface. The second flat-wise molded surface of the second molding die 20 has a first curved surface (convex curved surface) corresponding to the upper surface of FIG. 2 of the flat-wise bent portion Bf1 and a second curved surface corresponding to the upper surface of FIG. 2 of the flat-wise bent portion Bf2. Includes two curved surfaces (concave curved surfaces). Further, the second flatwise molded surface has a flat surface corresponding to the upper surface of FIG. 2 of the bus bar portion B between the edgewise bent portion Be1 and the flatwise bent portion Bf1 on the rotation axis RA side of the first curved surface. Including, between the first curved surface and the second curved surface, an upward flat inclined surface in FIG. 1 corresponding to the upper surface in FIG. 2 of the bus bar portion B between the flatwise bent portion Bf1 and the flatwise bent portion Bf2. Including, on the side opposite to the rotation axis RA of the second curved surface, a flat inclined surface downward in FIG. 1 corresponding to the upper surface of FIG. 2 of the bus bar portion B on the tip side of the flatwise bent portion Bf2 is included.

Further, at the end of the second molding die 20 on the side close to the first molding die 10, the rotation axis RA continuous with the corresponding flat surface, curved surface, and inclined surface of the second flatwise molding surface is used as the central axis. A guide surface (not shown) is formed, including a conical surface and the like. Further, the end of the second molding die 20 on the side far from the first molding die 10 projects downward in FIG. 1 from the second flatwise molding surface and extends along the second flatwise molding surface. Steps are formed. The side surface of the step portion on the first molding die 10 side is a flat surface extending in the radial direction of the second molding die 20.

As shown in FIG. 1, the tip forming portion 30 includes a support block 31 fixed to the installation location of the conductor forming apparatus 1 and a forming roller (molding member) as a bending jig rotatably supported by the support block 31. ) 35 and included. The support block 31 rotates in the rotation direction when the first molding die 10 is rotated around the rotation axis RA so as to be closer to the second molding die 20 than the initial position (stop position) of the first molding die 10. The forming roller 35 is installed on the downstream side of the above so as to face the first forming die 10. In this embodiment, the forming roller 35 is rotatably supported by the bracket 36 as shown in FIG. Further, the bracket 36 is slidably supported by the support block 31, and a spring (elasticity) that urges the forming roller 35 in a direction away from the support block 31 between the bracket 36 and the support block 31. Body) SP is placed. In this embodiment, the spring SP is a coil spring. However, the spring SP may be a leaf spring or a disc spring. Further, instead of the spring SP, a rubber material, resin, or the like may be installed between the bracket 36 and the support block 31.

As shown in FIG. 1, the coil holding portion 40 is formed by a support base 41 fixed to the installation location of the conductor forming apparatus 1, a coil mounting table 42 that is vertically supported by the support base 41, and a support base 41. It includes a coil holding plate 44 that is supported so as to be able to move up and down. In the coil holding unit 40, when the coil C conveyed by the coil transfer device (not shown) is placed on the coil mounting table 42, the coil mounting table 42 is mounted by a drive mechanism (not shown) controlled by the control device 100. Is lowered and the coil holding plate 44 is lowered so as to abut the coil C. As a result, the coil C can be firmly held (clamped) by the coil holding portion 40. Further, when the molding of the coil C by the conductor forming apparatus 1 is completed, the coil mounting table 42 is raised by the drive mechanism and the coil holding plate 44 is raised so as to be separated from the coil C. As a result, the molded coil C on the coil mounting table 42 can be delivered to a transfer device (not shown).

Further, the coil holding portion 40 includes a base end forming portion 45 (see FIG. 7 and the like) for forming the edgewise bent portion Be1 on the most proximal end side in the bus bar portion B. The base end forming portion 45 is formed on the support base 41 so that its side surface abuts on the inner side surface (side surface on the lead wire portion L side) of the bus bar portion B of the coil C on the lowered coil mounting table 42. There is. Further, an edgewise molded surface, which is a curved surface (cylindrical curved surface) corresponding to the edgewise bent portion Be1, is formed on the free end portion (end portion on the first molding die 10 side) of the base end forming portion 45. ing.

The first drive device 50 includes a motor M1 that is controlled by the control device 100 to apply rotational torque (driving force) to the drive shaft S1. As a result, the drive shaft S1 is rotationally driven by the motor M1 of the first drive device 50, so that the first molding die 10 can be rotated (turned) in the forward and reverse directions around the rotation axis RA. The second drive device 60 includes a motor M2 that is controlled by the control device 100 to apply rotational torque (driving force) to the drive shaft S2. As a result, the drive shaft S2 is rotationally driven by the motor M2 of the second drive device 60, so that the second molding die 20 can be rotated (turned) in the forward and reverse directions around the rotation axis RA.

The control device 100 of the conductor forming device 1 includes a computer having a CPU, ROM, RAM, etc., a drive circuit of motors M1 and M2 of the first and second drive devices 50 and 60, a control circuit of a drive mechanism of the coil holding unit 40, and the like. including. Further, the control device 100 includes a signal from a rotation sensor (not shown) that is included in the first drive device 50 and detects the rotation axis of the motor M1 or the rotation position of the drive shaft S1 and a motor that is included in the second drive device 60. A signal or the like from a rotation sensor (not shown) that detects the rotation position of the rotation shaft of M2 or the drive shaft S2 is input.

Further, in the control device 100, the control unit of the first drive device 50, the control unit of the second drive device 60, and the coil holding unit 40 are linked by the cooperation of hardware such as a CPU and a drive circuit and various programs installed in advance. The control unit and the like are constructed as functional blocks. The control unit of the first drive device 50 controls the motor M1 (rotation speed control) so that the drive shaft S1 rotates in a desired rotation direction at a desired rotation speed, or outputs a desired rotation torque to the drive shaft S1. The motor M1 is controlled (torque control) so as to be performed. Similarly, the control unit of the second drive device 60 controls the motor M2 (rotation speed control) so that the drive shaft S2 rotates in a desired rotation direction at a desired rotation speed, or the drive shaft S2 rotates as desired. The motor M2 is controlled (torque control) so that the torque is output. Further, the control unit of the coil holding unit 40 controls a drive mechanism (not shown) according to the progress of molding of the bus bar portion B by the conductor forming device 1, and raises and lowers the coil mounting table 42 and the coil holding plate 44.

Next, a procedure for forming the bus bar portion B of the coil C using the above-mentioned conductor forming apparatus 1 will be described.

At the start of molding of the bus bar portion B using the conductor forming apparatus 1, the control device 100 moves the first and second forming dies 10 and 20 to the initial positions shown in FIG. 1, respectively, and the first forming dies 10 and the second are formed. The mold 20 and the mold 20 are separated from each other. Further, the control device 100 controls the drive mechanism of the coil holding portion 40 so that the coil mounting table 42 and the coil holding plate 44 are raised to the initial positions shown in FIG. 1, respectively. The coil C including the unmolded bus bar portion B wound by the coil winding device is conveyed to the coil holding portion 40 by a transfer device (not shown) and placed on the coil mounting table 42. When the coil C is mounted on the coil mounting table 42, the control device 100 holds the coil so that the coil mounting table 42 is lowered and the coil holding plate 44 is in contact with the coil C, as shown in FIG. The drive mechanism of the unit 40 is controlled. As a result, the coil C is firmly held (clamped) by the coil holding portion 40, and the bus bar portion B of the coil C extends straight. Further, the inner side surface of the bus bar portion B (the side surface on the lead wire portion L side) comes into contact with the side surface of the base end forming portion 45 of the coil holding portion 40.

Subsequently, as shown in FIG. 5, the control device 100 is at a position where the guide surface of the second molding die 20 faces the upper surface of the bus bar portion B of the coil C in the drawing (stop position during molding of the second molding die 20). The motor M2 of the second drive device 60 is controlled so as to rotate the second molding die 20 around the rotation axis RA in the counterclockwise direction in the drawing. Further, the control device 100 rotates the first molding die 10 toward the second molding die 20 in the clockwise direction in FIG. 5 by a predetermined angle θ1 around the rotation axis RA. Motor M1 is controlled. The angle θ1 is, for example, the distance between the side surface of the step portion 14 of the first molding die 10 and the side surface of the step portion of the second molding die 20 when the first molding die 10 is rotated by the angle θ1 from the initial position. Is determined so as to substantially match the width of the bus bar portion B.

When the first forming die 10 is rotated around the rotation axis RA, the first forming die 10 gradually approaches the second forming die 20 and the coil is held by the coil holding portion 40. The bus bar portion B of C is gradually pushed up by the pressing surface 10p of the first molding die 10 in the upward direction in FIG. 5, that is, in the flatwise direction. Further, as the rotation angle of the first molding die 10 increases, the bus bar portion B becomes formed by the first flatwise molding surface 11 of the first molding die 10 and the second flatwise molding surface of the second molding die 20. It gets caught. As a result, when the first molding die 10 rotates with respect to the second molding die 20 by a predetermined angle θ1 around the rotation axis RA, the bus bar portion B is flatwise as shown in FIG. The bent portions Bf1 and Bf2 will be formed. Further, when the first molding die 10 rotates about the rotation axis RA by an angle θ1, the free end portion of the bus bar portion B becomes the first molding die 10 and the second molding die 20 as shown in FIG. It protrudes to the outside through the gap of.

In the wire forming device 1, the control device 100 rotates the drive shaft S1 at a predetermined rotation speed from the start of the rotation of the first forming die 10 until a predetermined time elapses. Motor M2 is controlled (rotation speed control). For the predetermined time, for example, a part of the bus bar portion B pressed by the pressing surface 10p of the first molding die 10 after starting the rotation of the first molding die 10 is the first flatwise molding of the first molding die 10. It is predetermined as the time until it comes into contact with the surface 11. The time required to form the flatwise bent portions Bf1 and Bf2 on the busbar portion B by controlling the rotation speed of the motor M1 while the busbar portion B is pressed by the pressing surface 10p of the first molding die 10 in this way. Can be shortened.

Further, the control device 100 causes the motor M1 of the first drive device 50 to output a predetermined rotational torque to the drive shaft S1 when the predetermined time elapses after starting the rotation of the first molding die 10. Control (torque control). Further, when the torque control of the motor M1 is started, the control device 100 outputs the rotational torque for stopping the second molding die 20 to the stop position during molding to the drive shaft S2. It controls the motor M2 of the second drive device 60. In this way, when the bus bar portion B is formed while rotating the first forming die 10 with respect to the second forming die 20, a rotational torque (driving force) is applied from the first driving device 50 to the first forming die 10. At the same time, by applying a rotational torque (driving force) from the second driving device 60 to the second molding die 20, the bus bar portion B is firmly sandwiched between the first and second molding dies 10 and 20, and the flatwise bent portion Bf1 , Bf2 can be formed with high accuracy.

When the rotation angle of the first molding die 10 becomes the angle θ1, the control device 100 once rotates the output of torque from the motors M1 and M2 of the first and second driving devices 50, that is, the rotation of the first molding die 10. After stopping, the first and second molding dies 10 and 20 are integrated so as to rotate counterclockwise in FIG. 6 by a predetermined angle θ2 around the rotation axis RA. 2 Controls the motors M1 and M2 of the drive devices 50 and 60. In the conductor forming apparatus 1, the direction in which the first and second forming dies 10 and 20 rotate integrally is opposite to the direction in which the first forming die 10 rotates with respect to the second forming die 20. Further, at this time, the control device 100 uses the motors of the first and second drive devices 50 and 60 so as to rotate the first and second molding dies 10 and 20 around the rotation axis RA at the same rotation speed. Controls M1 and M2.

When the first and second molding dies 10 and 20 rotate integrally in this way, the portion (base end) constrained by the base end molding portion 45 of the coil holding portion 40 of the bus bar portion B and the first of the bus bar portion B. The portion between the portion held (sandwiched) by the first and second molding dies 10 and 20 (the stepped portion 14 of the first molding die 10 and the stepped portion of the second molding die 20) is the base end forming portion 45. It is pressed against the edgewise molding surface and bent in the edgewise direction. As a result, the first and second molding dies 10 and 20 are integrally rotated around the rotation axis RA by an angle θ2, and as shown in FIG. 7, the bus bar portion B is bent at the edge width on the most proximal side. Part Be1 can be formed. At this time, by rotating the first and second molding dies 10 and 20 around the rotation axis RA at the same rotation speed, the bus bar portion B is firmly sandwiched by the first and second molding dies 10 and 20. The edgewise bent portion Be1 on the most proximal side can be formed with high accuracy.

Further, when the first and second molding dies 10 and 20 rotate integrally, the position where the first and second molding dies 10 and 20 start to rotate integrally, that is, the stop position of the first molding die 10 (second molding die 20). The inner surface of the free end portion of the bus bar portion B protruding outward through the gap between the first and second molding dies 10 and 20 on the downstream side in the rotation direction of both of the molding dies (stop position during molding). The right side surface of No. 6) comes into contact with the forming roller 35 of the tip forming portion 30 as shown in FIG. 8A. When the free end portion of the bus bar portion B comes into contact with the forming roller 35, the spring SP causes the forming roller 35 to be subjected to the first and second forming dies 10, 20 (the step portion 14 of the first forming die 10 and the step portion 14 of the first forming die 10) according to the displacement. The forming roller 35 is pressed against the bus bar portion B by the spring SP and is urged toward the free end portion side of the bus bar portion B which is held and rotated by the step portion of the second forming mold 20), and the first and second molding rollers 35 are pressed against the bus bar portion B. As the molding dies 10 and 20 rotate, they roll on the inner surface of the free end portion of the bus bar portion B. As a result, the free end portion of the bus bar portion B is pressed by the forming roller 35 as the first and second forming dies 10 and 20 and the forming roller 35 move relative to each other, and the first and second forming dies 10 and 20 are pressed. It is bent in the edgewise direction in the direction opposite to the rotation direction of 20, that is, in the direction opposite to the edgewise bending portion Be1 on the most proximal side.

Here, in the wire forming apparatus 1 of the present embodiment, the roller movement limiting portion 15 is formed on the outer peripheral portion of the first forming die 10, and the forming roller 35 is applied from the spring SP according to the displacement of the spring SP. When the urging force is increased, the outer peripheral surface 15s of the roller movement limiting portion 15 of the first molding die 10 is rolled while rolling on the inner surface of the free end portion of the bus bar portion B, as shown in FIG. 8 (b). Contact. Further, as shown in FIG. 8C, the forming roller 35 presses the free end portion of the bus bar portion B according to the urging force applied from the spring SP, and the outer peripheral surface 15s of the roller movement limiting portion 15 s. To roll.

When the outer peripheral surface 15s of the roller movement limiting portion 15 comes into contact with the forming roller 35 in this way, the urging force of the spring SP causes the first and second forming dies 10 and 20 and the forming roller 35 to move relative to each other. The movement of the bus bar portion B of the forming roller 35 toward the free end portion side is restricted. As a result, even if the rigidity of the spring SP required to bend the bus bar portion B is sufficiently secured, the movable range of the forming roller 35, that is, the expansion / contraction width of the spring SP is narrowed, and the expansion / contraction width of the spring SP is narrowed according to the displacement of the spring SP. It is possible to prevent the pressing force applied to the bus bar portion B from the forming roller 35 from increasing more than necessary.

As a result, by integrally rotating the first and second molding dies 10 and 20 around the rotation axis RA by an angle θ2, as shown in FIG. 7, the edgewise bent portion on the most tip side of the bus bar portion B is bent. Be4 can be formed with high accuracy. That is, since it is possible to prevent the forming roller 35 urged by the spring SP from excessively pressing the free end portion of the bus bar portion B, the edgewise bent portion Be4 may be bent too much, or the insulating coating may be formed by the forming roller 35. It is possible to prevent the periphery of the edgewise bent portion Be4 from which the shavings have been removed from being damaged. Further, by forming the edgewise bent portion Be4 at the free end portion of the bus bar portion B by using the forming roller 35 urged by the spring SP, a cam mechanism or a dedicated driving device is used for forming the edgewise bent portion Be4. It is possible to suppress the complication of the structure of the conductor forming apparatus 1 and suppress the increase in the equipment cost as compared with the case of using the forming portion having the above.

Further, by rotating the first and second molding dies 10 and 20 around the rotation axis RA at the same rotation speed, the bus bar portion B is firmly sandwiched by the first and second molding dies 10 and 20. The edgewise bent portion Be4 on the most tip side can be formed with high accuracy. The angle θ2 for integrally rotating the first and second molding dies 10 and 20 is determined in consideration of the bending angles of the edgewise bent portions Be1 and Be4 and the springback of the bus bar portion B (flat line). Further, the position (protrusion amount) of the roller movement limiting portion 15 in the first molding die 10 is determined in consideration of the rigidity of the spring SP, the bending angle of the edgewise bending portion Be4, the springback of the bus bar portion B (flat line), and the like. It is decided.

When the rotation angles of the first and second molding dies 10 and 20 become an angle θ2 and the formation of the edgewise bent portions Be1 and Be4 is completed, the control device 100 sets the motors M1 of the first and second drive devices 50 and 60. , M2 rotation, that is, the rotation of the first and second molding dies 10 and 20 is stopped. Further, the control device 100 controls the motor M2 of the second drive device 60 so that the second molding die 20 rotates around the rotation axis RA and returns to the initial position. At this time, the control device 100 controls the motor M2 of the second drive device 60 (rotation speed control) so that the drive shaft S2 rotates at a predetermined rotation speed. As shown in FIG. 9, when the second molding die 20 returns to the initial position, the control device 100 raises the coil mounting table 42 and the coil holding plate 44 to the initial positions shown in FIG. 1, respectively. Controls the drive mechanism of 40. As a result, as shown in FIG. 10, the coil holding plate 44 is separated from the coil C, and the coil C rises together with the coil mounting table 42. Then, the coil C for which the formation of the bus bar portion B is completed is delivered to a transfer device (not shown). After that, when the coil C including the unmolded bus bar portion B is placed on the coil mounting table 42, the lead wire forming apparatus 1 causes a plurality of bent portions Be1, Be4, Bf1 with respect to the busbar portion B of the coil C. And Bf2 will be formed.

As described above, according to the conductor forming apparatus 1, the edgewise bent portion Be4 is provided at the free end portion of the bus bar portion B of the coil C without damaging the bus bar portion B of the coil C while suppressing an increase in equipment cost. It is possible to form with high accuracy. Then, in the wire forming apparatus 1 which presses the bus bar portion B against the forming roller 35 while integrally rotating the first and second forming molds 10 and 20 holding the bus bar portion B around the rotation axis RA, FIG. As can be seen from the above, since the tip side of the bus bar portion B rotating around the rotation axis RA is pressed against the forming roller 35 more strongly, the roller movement limiting portion 15 is formed on the first forming die 10. Therefore, excessive bending of the edgewise bent portion Be4 and damage around the edgewise bent portion Be4 can be suppressed extremely satisfactorily.

In the conductor forming apparatus 1, the directions in which the first and second forming dies 10 and 20 rotate integrally are opposite to the rotation direction of the first forming die 10 with respect to the second forming die 20, but the first and The other rotation direction with respect to one of the second molding dies 10 and 20 and the direction in which the first and second molding dies 10 and 20 rotate integrally may be determined to be the same. Further, in the conductor forming apparatus 1, the first and second forming dies 10 and 20 may be configured to form at least one edgewise bent portion in addition to the flatwise bent portions Bf1 and Bf2. Further, depending on the structures of the first and second molding dies 10 and 20, a roller movement limiting portion may be formed in the second molding dies 20. Further, when the first and second molding dies 10 and 20 are integrally rotated around the rotation axis RA, the torque applied to one of the rear sides in the rotation direction of both is applied to the other side of the front side in the rotation direction. The motors M1 and M2 of the first and second drive devices 50 and 60 may be controlled so as to have a torque equal to or higher than the applied torque. Further, instead of rotating the first and second molding dies 10 and 20 integrally, the support block 31 supporting the forming roller 35 may be rotated around the rotation axis RA, and the first and second molding dies may be rotated. 10, 20 and the forming roller 35 (support block 31) may be relatively moved along a predetermined axis. Further, the shape of the outer peripheral surface 15s of the roller movement limiting portion 15 can be arbitrarily determined according to the shape of the free end portion of the target bus bar portion B. Further, instead of the forming roller 35, a forming member that does not include a moving part such as a block material or a belt having an edgewise forming surface may be used.

Although the embodiments for carrying out the invention of the present disclosure have been described so far, the invention of the present disclosure is not limited to the above-described embodiment, and various changes can be made within the scope of the extension of the present disclosure. Needless to say. Furthermore, the above-described embodiment is merely a specific embodiment of the invention described in the column of the outline of the invention, and does not limit the elements of the invention described in the column of the outline of the invention.

The invention of the present disclosure can be used in the manufacturing industry of a conductor including a bent portion.

1, Conductor forming device, 10 1st forming die, 10p pressing surface, 11 1st flatwise forming surface, 14 steps, 15 roller movement limiting part, 15s outer peripheral surface, 20 2nd forming die, 30 tip forming part, 31 Support block, 35 forming roller, 36 bracket, 40 coil holding part, 41 support base, 42 coil mounting table, 44 coil holding plate, 45 base end forming part, 50 1st drive, 60 2nd drive, 100 control Equipment, Be1, Be4 edgewise bent part, Bf1, Bf2 flatwise bent part, C coil, M1, M2 motor, S1, S2 drive shaft, W flat wire.

Claims (1)

In a wire forming apparatus in which two molding dies holding a conductor and a molding member are relatively moved, and the molding member is pressed against the end of the conductor to form a bent portion at the end.
An elastic body that urges the molded member toward the end in response to contact between the molded member and the end of the conducting wire.
It is formed on at least one of the two molding dies, and when the two molding dies and the molding member move relative to each other , the urging force applied to the molding member from the elastic body increases. a movement restricting portion which comes into contact with the said forming member for pressing, to limit movement of the said end side of the molding member according to the biasing force of the elastic member the ends Te,
A conductor forming device.

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