JP6936113B2 - Processing equipment for coil conductors - Google Patents

Description

The present invention relates to a processing device for a lead wire (coil lead wire) for a stator coil of a rotary electric machine.

Conventionally, a stator coil formed by inserting a large number of U-shaped coil conductors (conductor segments) into slots of a stator core of a rotary electric machine and sequentially joining them has been proposed. The coil conductor is, for example, a flat conductor having a rectangular cross-sectional shape, and its periphery is covered with an insulating film.

The coil conductor has a lead portion that protrudes from the end face of the stator core when it is formed into a U shape and inserted into the slot of the stator core, and the ends of the lead portions are joined by laser welding or the like. Therefore, the end portion of the lead portion of the coil lead wire is formed by peeling off the insulating film in advance and cutting a part of the conductor.

Patent Document 1 describes a step of peeling off the insulating film (electrically insulating resin film) at the end (tip) of the lead portion of the coil lead wire, and a subsequent step of cutting and molding a part of the tip. A method for processing a coil lead wire provided with a process for performing the process is disclosed.

Japanese Unexamined Patent Publication No. 2000-295821

When molding the end part as a separate process after peeling off the insulating film at the end part of the lead part of the coil lead wire (the end part of the coil lead wire), a separate device is required to perform each processing. It also takes a lot of man-hours.

Therefore, an object of the present invention is to make it possible to easily process the end portion of the coil lead wire.

The coil conductor processing device of the present invention is a coil conductor processing device for processing the end portion of a coil conductor whose cross-sectional shape is rectangular and whose periphery is covered with an insulating film. The coil has a die for arranging the coil lead wire, a first punch having a cutter portion for making a cut in the insulating film on the side surface of the coil lead wire, and a tip side of the coil lead wire from the cut. A second punch for punching a conductor portion on the side surface of the conducting wire and a driving device for driving the first punch and the second punch toward the die are provided , and the first and second punches are provided by the driving device. The first and second punches are arranged side by side so that when the punches are driven, the first and second punches process the coil conductors in this order .

According to the present invention, the punching process of the second punch simultaneously peels off the insulating film at the end of the coil lead wire and forms the inner conductor, so that the end portion of the coil lead wire can be easily machined. Can be done. Since the first punch makes a cut in the insulating film of the coil lead wire, even if the second punch subsequently peels off the insulating film and forms the internal conductor at the same time, it is on the root side of the cut part. It prevents the insulating film that you want to keep from peeling off.

It is a figure which shows the schematic structure of the processing apparatus of a coil lead wire. It is sectional drawing of the 1st punch. It is sectional drawing of the 2nd punch. It is sectional drawing of a die. It is a figure which shows the fixing member of the coil lead wire provided on the upper surface of a die. It is a figure which shows the state which the coil lead wire is fixed using the fixing member shown in FIG. It is a figure for demonstrating the processing of the coil lead wire by a 1st punch. It is a figure which shows the conductor for a coil after being machined by a 1st punch. It is a figure for demonstrating the processing of the coil lead wire by a 2nd punch. It is a figure which shows the conductor for a coil after being machined by a 2nd punch. It is sectional drawing of the 1st punch in another embodiment. It is sectional drawing of DD shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The coil lead wire according to this embodiment constitutes a stator coil of a rotary electric machine. The coil lead wire can also be called a conductor segment. A large number of U-shaped coil conductors are inserted into the slots of the stator core, and the ends of the lead portions thereof are sequentially joined to form the stator coil. The rotary electric machine includes a stator having a stator core around which a stator coil is wound, and a rotor provided on the inner peripheral side of the stator. The rotary electric machine is mounted on an electric vehicle such as a hybrid vehicle or an electric vehicle and used as an electric motor and a generator.

The coil conductor is a flat conductor having a rectangular cross-sectional shape, and the flat conductor is configured by covering a metal (conductor) such as copper having high conductivity with an insulating skin. That is, the circumference of the conductor is covered with an insulating film. A resin such as enamel with high insulating properties is used for the insulating skin cover.

In order to join the ends of the lead portions of the coil conductors to each other, the end portions of the lead portions of the coil conductors are formed by stripping the insulating film in advance and cutting a part of the internal conductor. The coil lead wire processing apparatus according to the present embodiment processes the end portion of the lead portion of the coil lead wire. Hereinafter, the end portion of the lead portion of the coil lead wire will be referred to as "end portion of the coil lead wire" or "end portion".

Here, the processing apparatus for the coil lead wire according to the present embodiment will be described. FIG. 1 is a diagram showing a schematic configuration of a coil lead wire processing device 10. As shown in FIG. 1, the coil conductor processing apparatus 10 is arranged on the upper frame 30, the stroke portion 34 provided so as to be movable in the vertical direction with respect to the upper frame 30, and the lower surface of the stroke portion 34. It includes a punch 18, a die 26 in which a coil lead wire 12 is arranged and a hole 42 into which the punch 18 is inserted, an attachment 36 of the die 26, and a lower frame 32 to which the attachment 36 is fixed.

The upper frame 30 includes a drive device 31 that moves (strokes) the stroke portion 34 in the vertical direction. The drive device 31 moves the stroke portion 34 and the punch 18 arranged on the lower surface of the stroke portion 34 from the position shown in FIG. 1 toward the die 26. As a result, the punch 18 enters the hole 42 of the die 26 while processing the coil lead wire 12 arranged in the die 26.

The punch 18 is composed of a first punch 20 provided on the lower side and a second punch 22 provided on the upper side. As will be described in detail later, the first punch 20 is for making a cut in the insulating film on the side surface of the coil lead wire 12. Further, in the second punch 22, after the insulating film is cut by the first punch 20, the insulating film of the coil lead wire is peeled off and the internal conductor is formed. Each of the first punch 20 and the second punch 22 is provided with a pin hole and a screw hole. The first punch 20 and the second punch 22 are positioned by aligning the positions of the respective pin holes and passing the pin 40 through, and by aligning the positions of the respective screw holes and screwing the screw 38, the first punch 20 and the second punch 22 are positioned. The 1st punch 20 and the 2nd punch 22 are combined and integrated.

FIG. 2 is a cross-sectional view of the first punch 20 (AA cross-sectional view of FIG. 1). As shown in FIG. 2, the first punch 20 includes a main body portion 44 having a substantially C-shaped cross-sectional shape, and a cavity 48 provided inside the main body portion 44. The main body 44 has a plurality of pin holes 41a through which the pins 40 are inserted and a plurality of screw holes 39a into which the screws 38 are screwed. The cavity 48 is a space into which the end of the coil lead wire 12 enters when the first punch 20 moves toward the die 26. As shown in FIG. 2, the inner wall of the cavity 48 is provided with a pair of cutter portions 46 projecting inward of the cavity 48. The pair of cutter portions 46 make a cut in the insulating film on the side surface at the end portion of the coil conducting wire 12.

FIG. 3 is a cross-sectional view of the second punch 22 (BB cross-sectional view of FIG. 1). As shown in FIG. 3, the second punch 22 includes a main body portion 49 having a substantially C-shaped cross-sectional shape, and a cavity 50 provided inside the main body portion 49. The main body 49 has a plurality of pin holes 41b through which the pins 40 are inserted and a plurality of screw holes 39b into which the screws 38 are screwed. The cavity 50 is a space into which the end of the coil lead wire 12 enters when the second punch 22 moves toward the die 26. By the second punch 22, the end portion of the coil lead wire 12 is punched along the cross-sectional shape of the cavity 50.

FIG. 4 is a cross-sectional view of the die 26 (CC cross-sectional view of FIG. 1). The die 26 has a main body 27 and a hole 42 provided substantially in the center of the main body 27. The cross-sectional shape of the hole 42 is a shape in which the cross-sectional shape of the main body portion 44 of the first punch 20 and the cross-sectional shape of the main body portion 49 of the second punch 22 are overlapped. As a result, when the punch 18 (first punch 20 and second punch 22) is lowered to process the end portion of the coil lead wire 12, both the first punch 20 and the second punch 22 are made of the die 26. It is designed to enter the hole 42.

Next, the processing of the end portion of the coil lead wire 12 using the coil lead wire processing device 10 of the present embodiment will be described.

FIG. 5 is a diagram showing a state in which the coil lead wire 12 is placed on the upper surface of the die 26. As shown in FIG. 5, the coil lead wire 12 is placed on the upper surface of the die 26 so as to straddle the hole 42 of the die 26. A fixing member 56 for fixing the coil conducting wire 12 to the die 26 is provided on the upper surface of the die 26. The fixing member 56 includes a fixing portion 58a that is fixed to the upper surface of the die 26 and has a desired thickness, and a movable portion 58b that is slidably connected to the upper surface of the die 26 and has a desired thickness toward the fixing portion 58a. .. As shown in FIG. 5, the coil lead wire 12 is placed between the fixed portion 58a and the movable portion 58b. Then, by sliding the movable portion 58b toward the fixed portion 58a, as shown in FIG. 6, the coil lead wire 12 is sandwiched between the fixed portion 58a and the movable portion 58b and fixed to the die 26. The movable portion 58b may be urged toward the fixed portion 58a by an urging member, or the movable portion 58b is locked so as not to move at a position where the coil lead wire 12 shown in FIG. 6 is sandwiched. It may have a mechanism to be used. As a result, the coil lead wire 12 is securely fixed to the die 26.

Next, the drive device 31 moves the punch 18 toward the die 26. As a result, first, the end portion of the coil lead wire 12 is processed by the first punch 20. FIG. 7 is a diagram showing a state in which the end portion of the coil lead wire 12 is processed by the first punch 20, and the coil lead wire 12 is shown by a chain double-dashed line. As the first punch 20 moves (descends) toward the die 26, the end surface of the first punch 20 comes into contact with the upper surface of the coil lead wire 12, and the first punch 20 further descends, as shown in FIG. The tip end side of the coil lead wire 12 is cut by the end surface of the first punch 20 between the inner wall 60 of the cavity 48 of the first punch 20 and the outer wall 62 of the main body 44. That is, the coil lead wire 12 located on the tip side of the back wall 60 of the cavity 48 is separated. At this time, the coil lead wire 12 between the back wall 60 of the cavity 48 and the outer wall 62 of the main body 44 falls down through the hole 42 of the die 26. In FIG. 7, the tip of the coil conducting wire 12 is arranged so as to penetrate to the left side of the outer wall 62 of the main body portion 44, but the tip of the coil conducting wire 12 is arranged so as to penetrate the inner wall 60 of the cavity 48 and the outer wall of the main body portion 44. The tip side of the coil lead wire 12 may be cut by arranging it so as to be between the coil conductor and 62.

As shown in FIG. 7, when the first punch 20 is lowered, the pair of cutter portions 46 of the first punch 20 come into contact with the side surface of the coil conducting wire 12, and a cut is made in the insulating film on the side surface. FIG. 8 is a top view of the end portion of the coil conductor 12 after the first punch 20 is further lowered and passes through the coil conductor 12. By processing the first punch 20, the inner conductor of the end face 70 (end face on the tip side) of the end portion of the coil lead wire 12 is exposed, and the insulating coatings on the two side surfaces 66 and 68 of the coil lead wire 12 are formed. A notch 64 is made. In FIGS. 8 and 9 and 10 described below, the notch 64 is exaggerated and drawn larger.

By further lowering the punches 18 (first punch 20 and second punch 22), the first punch 20 enters the hole 42 of the die 26, and then the end face of the second punch 22 is placed on the upper surface of the coil lead wire 12. Upon contact, the second punch 22 processes the end of the coil lead wire 12. FIG. 9 is a diagram showing a state in which the end portion of the coil lead wire 12 is processed by the second punch 22, and the coil lead wire 12 is shown by a chain double-dashed line. As shown in FIG. 9, the width of the cavity 50 of the second punch 22 in the vertical direction (vertical direction in FIG. 9) is narrower than that of the coil conducting wire 12. Therefore, when the second punch 22 descends and passes through the coil conductor 12, the conductor portion (insulating film and internal conductor) at the end of the coil conductor 12 is punched. Here, the portion to be punched is the portion on the tip side of the notch 64 of the coil conducting wire 12. By this punching process, the insulating film at the end of the coil lead wire 12 is peeled off and the internal conductor is formed at the same time.

FIG. 10 is a top view of the end portion of the coil lead wire 12 after being machined by the second punch 22. By processing the second punch 22, the insulating coatings on the two side surfaces 66 and 68 on the tip side of the notch 64 of the coil lead wire 12 are peeled off, and the inner conductor is further formed. Since the insulating film of the coil conductor 12 is cut in advance by the first punch 20, even if the insulating film is peeled off and the internal conductor is formed by the second punch 22 in this way, the coil conductor is formed at the same time. It is prevented that the insulating film to be left on the root side of the portion where the notch 64 of 12 is made is peeled off. When the second punch 22 descends and passes through the coil lead wire 12, the second punch 22 also enters the hole 42 of the die 26 in addition to the first punch 20.

As described above, the end portion of the coil lead wire 12 is processed. After one end of the coil lead wire 12 is machined in this way, the punch 18 is raised and the coil lead wire 12 is removed from the die 26. Then, the coil conductor 12 is cut to a desired length, and the other end of the coil conductor 12 is processed in the same manner.

Next, the operation and effect of the coil lead wire processing apparatus 10 of the present embodiment will be described.

According to the coil conductor processing apparatus 10 of the present embodiment described above, the insulating film at the end of the coil conductor 12 is peeled off and the internal conductor is formed at the same time by punching the second punch 22. , The end portion of the coil lead wire 12 can be easily machined. That is, the device configuration can be simplified and the man-hours for processing can be reduced as compared with the case where the insulating film at the end of the coil lead wire 12 is peeled off and then the end is formed as a separate process. Can be done. Since the insulating film of the coil conductor 12 is cut by the first punch 20, even if the insulating film is peeled off and the internal conductor is formed by punching the second punch 22 at the same time, the cut 64 It is prevented that the insulating film to be left on the root side of the part where the is inserted is peeled off.

Further, according to the coil conductor processing apparatus 10 of the present embodiment described above, since the first punch 20 and the second punch 22 are integrated, the punch 18 (the first punch 20 and the second punch 22) is integrated. ) Is lowered once by the driving device, so that the cutting process by the first punch 20 and the punching process by the second punch 22 can be performed at once. Therefore, the device configuration is very simple and the man-hours are very small. Further, since the first punch 20 and the second punch 22 are integrated, the coil conducting wire 12 is punched by the second punch 22 with respect to the cutting position of the coil conducting wire 12 by the first punch 20. The position of is not shifted. As a result, it is surely prevented that the insulating film to be left is peeled off.

In the coil conductor processing apparatus 10 of the embodiment described above, the first punch 20 and the second punch 22 are integrated, but the first punch 20 and the second punch 22 are separated into coils. The end portion of the lead wire 12 may be processed. For example, two dies 26 are prepared, the first die is used for cutting with the first punch 20, and then the second die is used for punching with the second punch 22. May be good. Even in this case, the second punch 22 simultaneously peels off the insulating film at the end of the coil lead wire 12 and forms the inner conductor, so that the end portion of the coil lead wire 12 can be easily processed. Become.

In the first punch 20 in the coil lead wire processing apparatus 10 of the embodiment described above, a pair of cutter portions 46 are formed by the main body portion 44 thereof. However, the pair of cutter portions 46 may be separate from the main body portion 44 of the first punch 20. FIG. 11 is a cross-sectional view of the first punch 20 in the other embodiment. As shown in FIG. 11, a pair of slits 52 are provided on the inner wall of the cavity 48 of the first punch 20, and a knife 54 such as a cutter blade is inserted into each of the slits 52. FIG. 12 is a cross-sectional view taken along the line DD of FIG. As shown in FIG. 12, for example, the slit 52 is provided by a predetermined width from the end surface 72 of the first punch on the side in contact with the second punch 22 toward the lower side, and the knife 54 is inserted into the slit 52 to provide an adhesive. It is fixed in the slit 52 by the like. The knife 54 has a wide shape on the upper side and a narrow shape on the lower side, whereby the first punch 20 moves in the direction of the thick arrow in FIG. 12 and cuts into the insulating film of the coil conducting wire 12. When the knife 54 is inserted, the knife 54 gradually enters the insulating film as it moves. In the case of this embodiment, the hole 42 of the die 26 has a cross-sectional shape through which a pair of knives 54 arranged in the first punch 20 can pass. As described above, even if the cutter portion 46 of the first punch 20 is used as a separate knife 54, the insulating film can be satisfactorily cut at the end portion of the coil lead wire 12.

10 Coil conductor processing equipment, 12 Coil conductor, 18 punch, 20 1st punch, 22 2nd punch, 26 die, 27 main body, 30 upper frame, 31 drive device, 32 lower frame, 34 stroke part, 36 Attachment, 38 screws, 39a, 39b screw holes, 40 pins, 41a, 41b pin holes, 42 holes, 44 main body, 46 cutters, 48 cavities, 49 main bodies, 50 cavities, 52 slits, 54 knives, 56 for fixing Member, 58a fixed part, 58b movable part, 60 back wall, 62 outer wall, 64 notches, 66, 68 side surface, 70 end face, 72 end face of first punch.

Claims (1)

It is a coil conductor processing device that processes the end of a coil conductor whose cross-sectional shape is rectangular and whose circumference is covered with an insulating film.
A die for arranging the coil conductor and
A first punch having a cutter portion for making a cut in the insulating film on the side surface of the coil lead wire, and
A second punch for punching a conductor portion on the side surface of the coil conductor on the tip side of the coil conductor with respect to the notch.
A drive device for driving the first punch and the second punch toward the die is provided .
When the first and second punches are driven by the driving device, the first and second punches are arranged side by side so that they process the coil conductors in the order of the first and second punches. ,
A coil lead wire processing device characterized by this.

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