JP2019110633A - Cutting method of flat square conductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the turning of an insulating film due to cutting of a flat conductor. SOLUTION: A pair of cutting blades 21 and 22 are brought close to each other and pressed against opposite side surfaces of a flat conductor 30 to make a cut in an insulating film 32 so that a part of a conductor 31 of the flat conductor 30 is exposed. put in. Then, the cutting blade 12 is pressed against the side surface on the longitudinal side so as to cut out at the cutting line CL including the exposed area of the conductor 31, and the flat conductor 30 is cut. As a result, when the flat conductor 30 is cut, the insulating film 32 can be prevented from being dragged by the cutting blade 12 and the insulating film 32 can be prevented from being turned over. [Selection diagram] FIG. 6

Description

  The present invention relates to a cutting method for cutting a flat conductor coated with an insulating film.

  Conventionally, the first peeling portion for peeling the insulation coating (insulation film) on the first and second side surfaces of the rectangular conductor and the second coating for peeling the insulation coating on the third and fourth side in the same longitudinal direction of the rectangular conductor There has been proposed a coil segment manufacturing apparatus provided with a covering peeling portion including a peeling portion and a lead wire cutting portion for cutting a flat rectangular conductor (see, for example, Patent Document 1). The first peeling section has a peeling mold including two peeling blades extending in parallel, and is moved on the first and second side surfaces by moving the peeling mold along the first and second side surfaces of the flat conductor. Peel off the insulation coating of Similarly, the second peeling part has a peeling mold including two peeling blades extending in parallel, and the third and fourth peeling parts are moved by moving the peeling mold along the third and fourth sides of the flat angle conductor. Strip off the insulation coating on the four sides as you cut it.

JP, 2015-043676, A

  In the above-described coil segment manufacturing apparatus, since the peeling blade is moved along the side surface of the flat conductor, the drag of the insulating film by the peeling blade is generated, and the insulating film is peeled off. In a stator coil for a motor consisting of a plurality of flat conductors, usually, the flat conductor is cut into a fixed length and the insulation film at the end is removed, and the flat conductor is bent into a substantially U shape and inserted into the slots of the stator core. , Manufactured by joining the ends of a plurality of rectangular conductors. For this reason, if the insulating film of the flat conductor is flipped, the flip of the insulating film may develop when the flat conductor is inserted into the slot of the stator core, which may cause insulation failure.

  The method for cutting a rectangular conductor according to the present invention has as its main object to suppress the flipping of the insulating film accompanying the cutting of the rectangular conductor.

  The method for cutting a flat rectangular conductor of the present invention adopts the following means in order to achieve the above-mentioned main object.

The method for cutting a flat conductor of the present invention is
A method of cutting a flat conductor, the method comprising: cutting a flat conductor coated with an insulating film, the method comprising:
A precutting step of moving a pair of cutting blades in a direction toward each other to press them against the opposing first side surfaces of the flat conductor, and cutting the insulating film so that a part of the flat conductor is exposed;
A cutting step of cutting the flat conductor by pressing a cutting blade against a second side surface orthogonal to the first side surface of the flat conductor so as to cut at a cutting line including the exposed area of the conductor;
The gist is to have

  The method for cutting a rectangular conductor of the present invention includes a pre-cutting step and a cutting step. In the pre-cutting step, the pair of cutting blades is moved in the direction toward each other, and the insulating coating is cut so that a part of the conductor of the flat conductor is exposed by pressing against the opposing first side of the flat conductor. In the cutting step, the cutting blade is pressed against the second side surface orthogonal to the first side surface of the rectangular conductor so as to cut out the rectangular conductor by the cutting line including the exposed area of the conductor in the pre-cutting step. Thereby, in the cutting process, it is possible to prevent the drag of the insulating film by the cutting blade and to suppress the flipping of the insulating film.

It is a front view of stator 1 for electric motors. It is explanatory drawing which shows the assembly | attachment procedure of a stator coil. FIG. 2 is a configuration diagram showing an outline of a configuration of a cutting device 10. FIG. 2 is a configuration diagram showing an outline of a configuration of a pre-cut device 20. 5 is a side view of a cutting blade 21. FIG. It is an explanatory view showing the procedure of processing of a flat angle conductor. It is an explanatory view showing a situation of cutting of a flat angle conductor in a comparative example. It is an explanatory view showing a situation of cutting of a flat angle conductor in an example. It is a side view of the cutting blade 121 of a modification.

  Next, modes for carrying out the present invention will be described using examples.

  FIG. 1 is a front view of a stator 1 for a motor. A stator 1 for a motor is combined with a rotor to form a three-phase alternating current generator-motor, and is used, for example, as a motor or a generator for traveling such as an electric car or a hybrid car. The stator 1 is, as shown in FIG. 1, a stator core 2 having a plurality of slots formed at equal intervals in the circumferential direction on the inner circumferential side, and a plurality of stator coils 5 each composed of a plurality of segment conductors 4; Equipped with The stator core 2 is formed by laminating a plurality of stator plates formed by punching out non-oriented electrical steel sheets, and has a plurality of teeth projecting radially inward so that a plurality of slots are formed on the inner peripheral side. Have.

  The segment conductor 4 is formed by bending a flat rectangular conductor linearly extended as a material of the segment conductor 4 into a substantially U shape. The rectangular conductor is formed of a highly conductive metal such as copper and has a rectangular cross section, and the surface thereof is covered with an insulating film such as enamel resin in order to ensure insulation with the stator core 2.

  FIG. 2 is an explanatory view showing an assembling procedure of the stator coil. The assembly of the stator coil is performed as follows. First, as shown in FIGS. 2 (a) and 2 (b), one end 4e of the segment conductor 4 is inserted into the corresponding slot of the stator core 2 from one end side to the other end side in the axial direction The end 4 e is inserted from the one end side to the other end side in the axial direction into another slot circumferentially separated from the slot. The end 4 e of the segment conductor 4 is projected outward from the other end side in the axial direction of the slot of the stator core 2. After all the segment conductors 4 are assembled to the stator core 2, as shown in FIG. 2 (c), the end of the other segment conductor 4 corresponding to the side surface of the end 4e of the segment conductor 4 on the longitudinal side (flat width side) A portion of each segment conductor 4 protruding from the slot is bent and formed using a bending machine (not shown) so that the longitudinal side face of the portion 4 e is butted. Then, the end 4 e of the segment conductor 4 and the end 4 e of the other segment conductor 4 corresponding to each other are joined by welding or the like. Thereby, a plurality of stator coils 5, that is, a U-phase coil, a V-phase coil and a W-phase coil are formed.

  Here, since the end 4 e of the segment conductor 4 (the end of the flat conductor) is joined to the end 4 e of the other segment conductor 4, it is cut by the cutting device and the insulating film is removed. FIG. 3 is a schematic view showing the configuration of the cutting apparatus 10. As shown in FIG. The cutting device 10 includes a punch 11, a die 15, and a clamper (not shown). The punch 11 has a cutting blade 12 whose cutting edge is curved in a substantially U-shape. The die 15 includes a seating surface 16 which linearly extends and on which a side surface on the longitudinal side (flat width side) of the rectangular conductor 30 is seated, and an extension end of the seating surface 16 as a part of an opening edge. And an insertion hole 17 that opens along the The clamper clamps the flat conductor 30 with the die 15 vertically. The cutting device 10 carries the flat conductor 30 onto the seating surface 16 by a transport device (not shown) and moves the punch 11 toward the insertion hole 17 of the die 15 while clamping the flat conductor 30 onto the seating surface 16 by a clamper. The cutting edge of the cutting blade 12 is pressed against the longitudinal side surface (second side surface) of the flat conductor 30 to cut the flat conductor 30 (cutting step).

  Further, when cutting the rectangular conductor 30, a precutting process is performed in which a cut is made in the insulating film on the opposite side surface (first side surface) of the short side (edge width side) of the rectangular conductor 30 using a precut device. FIG. 4 is a block diagram showing an outline of the configuration of the precut device 20. As shown in FIG. The pre-cutting device 20 has a pair of cutting blades 21 and 22 arranged such that the cutting edges face each other with the flat angle conductor 30 interposed therebetween. The cutting edges of the pair of cutting blades 21 and 22 extend in a direction perpendicular to the extending direction of the flat conductor 30 seated on the seating surface 16 and parallel to the side surface on the short side. In the present embodiment, as shown in FIG. 5, the cutting blade 21 is formed by a single blade having a blade on only one side, and the angle of the cutting edge is, for example, 60 degrees. Further, the cutting blade 12 is also formed in the same manner as the cutting blade 21. The pair of cutting blades 21 and 22 is movable in the direction in which the cutting edges approach and separate from each other by a drive device (not shown). The precut device 20 carries the flat conductor 30 onto the seating surface (not shown) between the cutting blades 21 and 22 by a transport device (not shown), and brings the cutting edges of the cutting blades 21 and 22 close to each other. A cut is made in the insulating film of the rectangular conductor 30 by pressing against the side (pre-cut step).

  FIG. 6 is an explanatory view showing a processing procedure of the flat conductor. First, after the rectangular conductor 30 is carried in between the pair of cutting blades 21 and 22, the pair of cutting blades 21 and 22 is placed on the opposite side surface (first side surface) of the short side (edge width side) of the rectangular conductor 30. The insulating coating is cut along the direction perpendicular to the extending direction of the flat conductor 30 (see FIGS. 6A and 6B). The cutting of the insulating film is performed such that the cutting edges of the pair of cutting blades 21 and 22 penetrate into the conductor portion of the rectangular conductor 30 and the conductor portion is exposed. Then, the cutting blade 12 is pressed against the side surface on the long side (flat width side) of the flat conductor 30 to cut the flat conductor 30 so as to cut along the cutting line CL including the exposed area of the conductor (FIGS. d) see). The insulating film remaining on the side surface on the longitudinal side of the rectangular conductor 30 can be removed using a laser or the like.

  FIG. 7 is an explanatory view showing a state of cutting of the rectangular conductor in the comparative example, and FIG. 8 is an explanatory view showing a state of cutting of the rectangular conductor in the embodiment. The cutting blade 12 is a cutting blade 12 when cutting the flat conductor 30B without performing precut as in the comparative example in order to cut and advance the flat conductor (insulation film 32B and conductor 31B) from the front to the back in the figure. As a result, the drag of the insulating film 32B occurs, and the insulating film 32B is peeled off. If the insulating film 32B of the rectangular conductor 30B is turned over, then when the rectangular conductor 30B is bent and formed into a substantially U shape and inserted into the slot of the stator core 2, the turning of the insulating film 32B develops and causes an insulation failure. There is a risk. On the other hand, in the embodiment, the insulating coating 32 is cut so that the pair of cutting blades 21 and 22 intrude into the portion of the conductor 31 of the flat conductor 30 and a part of the conductor 31 is exposed and then cut. The flat angle conductor 30 is cut so as to cut along the cutting line CL including the exposed area of the conductor 31 by the blade 12. Thereby, the drag of the insulating film 32 by the cutting blade 12 does not occur at the time of cutting the flat rectangular conductor 30, and the turning of the insulating film 32 can be suppressed.

  In the method for cutting a flat conductor according to the present embodiment described above, the pair of cutting blades 21 and 22 are brought close to each other, and a part of the conductor 31 of the flat conductor 30 is pressed against the opposite side of the short side of the flat conductor 30 A cut is made in the insulating film 32 so as to be exposed. Then, the cutting blade 12 is pressed against the longitudinal side so as to cut out the rectangular conductor 30 so as to cut out along the cutting line CL including the exposed area of the conductor 31. Thereby, when the flat rectangular conductor 30 is cut, the drag of the insulating film 32 by the cutting blade 12 can be avoided, and the flipping of the insulating film 32 can be prevented.

  In the embodiment, the pair of cutting blades 21 and 22 is formed by a single blade having a blade only on one side, but as shown in the cutting blade 121 of the modified example of FIG. It may be formed by double-edged blades each having a blade on both sides. The two blades may be formed at different inclination angles on one side and the other side. For example, the inclination angle on one side can be 15 degrees, and the inclination angle on the other side can be 45 degrees.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the section of "Means for Solving the Problems" will be described. In the embodiment, the cutting blades 21 and 22 correspond to a "cutting blade", and the cutting blade 12 corresponds to a "cutting blade".

  In addition, the correspondence of the main elements of the embodiment and the main elements of the invention described in the section of the means for solving the problem implements the invention described in the column of the means for solving the problem in the example. The present invention is not limited to the elements of the invention described in the section of “Means for Solving the Problems”, as it is an example for specifically explaining the mode for carrying out the invention. That is, the interpretation of the invention described in the section of the means for solving the problem should be made based on the description of the section, and the embodiment is an embodiment of the invention described in the section of the means for solving the problem. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all by these Examples, In the range which does not deviate from the summary of this invention, it becomes various forms Of course it can be implemented.

  The present invention is applicable to the coil manufacturing industry and the like.

  DESCRIPTION OF SYMBOLS 1 Stator for motor, 2 Stator core, 4 segment conductor, 4e end, 5 stator coil, 10 cutting device, 11 punch, 12 cutting blade, 15 die, 16 seating surface, 17 insertion hole, 20 precut device, 21 and 22 , 121 cutting blade, 30 flat conductors, 31 conductors, 32 insulating films.

Claims (1)

A method of cutting a flat conductor, the method comprising: cutting a flat conductor coated with an insulating film, the method comprising:
A precutting step of moving a pair of cutting blades in a direction toward each other to press them against the opposing first side surfaces of the flat conductor, and cutting the insulating film so that a part of the flat conductor is exposed;
A cutting step of cutting the flat conductor by pressing a cutting blade against a second side surface orthogonal to the first side surface of the flat conductor so as to cut at a cutting line including the exposed area of the conductor;
A method of cutting a flat conductor comprising:

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