How to remove the insulation coating from rectangular wire

Abstract

To provide a method of peeling a peelable insulating film of a flat wire without allowing the insulating film to remain.SOLUTION: A method of peeling an insulating film of a flat wire comprises a first peeling step of peeling an insulating film of two sides (long sides) opposed to the flat wire over a predetermined range along a length direction of the flat wire, a corner movement step of moving ridge line positions formed respectively along the length direction of the flat wire by both end points of the two sides to an outer side over the predetermined range, a chamfering step of forming a chamfering part at a corner comprising ridge lines moved outward over the predetermined range, and a second peeling step of peeling the insulating film of two sides (short sides) of the flat wire over the predetermined range; the steps performed in order.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a method for stripping an insulating coating from a rectangular wire. [Background technology]

[0002] Conventionally, a method has been proposed in which chamfering is performed by plastically deforming both ends of two opposing sides of a rectangular wire, for example used in a motor stator coil, before peeling off the insulating coating of the wire (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-40441 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the manufacturing method of the rectangular wire disclosed in Patent Document 1, there was a possibility that the insulating coating on the left and right side surfaces of the rectangular wire would intrude inward during plastic deformation. Therefore, when the insulating coating on the left and right side surfaces of the rectangular wire was peeled off in a later process, there was a possibility that the inward insulating coating would remain.

[0005] An object of the present invention is to provide a method for stripping an insulating coating from a rectangular wire, which is capable of stripping the insulating coating from the wire without leaving any of the insulating coating behind. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the method for stripping the insulating coating from a rectangular wire of the present invention is characterized by sequentially carrying out the following steps: a first stripping step, in which the insulating coating on two opposing sides of a rectangular wire is stripped over a predetermined range along the length of the rectangular wire; a corner moving step, in which the positions of the ridge lines formed by both end points of the two sides along the length of the rectangular wire are moved outward over a predetermined range; a chamfering step, in which a chamfer is formed at the corner including the ridge line that has been moved outward over a predetermined range; and a second stripping step, in which the insulating coating on two sides perpendicular to the two sides of the rectangular wire is stripped over a predetermined range.

[0007] According to this configuration, the insulating coating can be peeled off without leaving any part of it behind.

[0008] In addition, in the method for stripping the insulating coating from a rectangular wire according to the present invention, the corner moving process presses a first die having abutment portions with a smaller cross-sectional area toward the tip along the length of the rectangular wire, respectively, near the ridge lines of two opposing sides of the rectangular wire over a predetermined range.

[0009] According to this configuration, the processing involved in the corner moving step can be performed by a curved blade, making it possible to eliminate the need for periodic replacement of the blade.

[0010] In addition, in the method for stripping the insulating coating from a rectangular wire according to the present invention, the corner moving process presses a second die having abutment portions whose cross-sectional area becomes smaller toward the tip along the length of the rectangular wire, approximately at the center of two opposing sides of the rectangular wire, over a predetermined range.

[0011] According to this configuration, the processing involved in the corner moving step can be performed by a curved blade, making it possible to eliminate the need for periodic replacement of the blade. Effect of the Invention

[0012] According to the present invention, it is possible to provide a method for stripping an insulating coating from a rectangular wire, which is capable of stripping the insulating coating without leaving any part of the insulating coating behind. [Brief description of the drawings]

[0013] [Figure 1]FIG. 1 is a perspective view showing an example of a rectangular wire from which an insulating coating has been removed. [Diagram 2] FIG. 2 is a flow chart showing an example of a procedure for stripping the insulating coating from a rectangular wire. [Diagram 3] FIG. 3 is a diagram illustrating a method for removing the insulating coating from the long sides of the rectangular wire. [Figure 4A] FIG. 4A is a diagram illustrating a method for moving a corner of a rectangular wire. [Figure 4B] FIG. 4B is a diagram showing another form of a curved blade used for moving the corner of a rectangular wire. [Diagram 5] FIG. 5 is a diagram for explaining a method for chamfering the corners of a rectangular wire. [Figure 6] FIG. 6 is a diagram illustrating a method for removing the insulating coating from the short sides of a rectangular wire. [Figure 7] FIG. 7 is a diagram for explaining a method for forming a depression in a rectangular wire. [Figure 8] FIG. 8 is a diagram for explaining a method for cutting and chamfering a rectangular wire. [Figure 9] FIG. 9 is a diagram for explaining another method for moving the corner of a rectangular wire. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0015] (Schematic structure of rectangular wire with the insulation coating peeled off) The schematic structure of a rectangular wire from which an insulating coating has been peeled off according to the present invention will be described with reference to Fig. 1. Fig. 1 is an external perspective view showing an example of a rectangular wire from which an insulating coating has been peeled off.

[0016] The rectangular wire 10 has a structure in which an insulating coating 13 is formed on the surface of a conductor 12 having a rectangular cross section. The insulating coating 13 at the tip of such a rectangular wire 10 is peeled off to expose the conductor 12, and different conductors 12 are welded together to form a stator coil of a motor.

[0017] FIG. 1 shows an example of a state in which an insulating coating 13 has been peeled off from a tip portion of a rectangular wire 10 using the insulating coating peeling method of the present disclosure.

[0018] The rectangular wire 10 has a rectangular cross section formed by a long side 14a extending along the Y axis and a short side 14b extending along the Z axis. The inside of the rectangular wire 10 is formed of a conductive conductor 12 such as copper, and the outside is covered with a non-conductive insulating coating 13 such as enamel. The insulating coating 13 is peeled off from the tip of the rectangular wire 10, exposing the conductor 12. In this embodiment, the long side 14a is described as being longer than the short side 14b, but the long side 14a and the short side 14b may be the same length. The long side 14a and the short side 14b may be reversed. That is, in the following description, where the long side 14a and the short side 14b are described, the long side 14a may be read as the short side 14b, and the short side 14b may be read as the long side 14a.

[0019] The tip of the rectangular wire 10 from which the insulating coating 13 has been peeled off has top and bottom surfaces 15a, left and right surfaces 15b, and a tip surface 15c. The top and bottom surfaces 15a are surfaces formed along the length of the conductor 12 and along the XY plane. The left and right surfaces 15b are surfaces formed along the length of the conductor 12 and along the XZ plane. The tip surface 15c is a surface formed at the tip of the conductor 12 and along the YZ plane.

[0020] Chamfered portions 16a are formed at the positions of ridges (corners) that are the intersections between the top and bottom surfaces 15a and the left and right surfaces 15b of the conductor 12. In addition, chamfered portions 16b are formed at the positions of the intersections between the left and right surfaces 15b and the tip surface 15c of the conductor 12. In addition, chamfered portions 16c are formed at the positions of the intersections between the top and bottom surfaces 15a and the tip surface 15c of the conductor 12. By forming these chamfered portions 16a, 16b, and 16c, when insulating powder coating is applied to the coil formed by welding the conductor 12 in a later process, the sprayed powder is reliably attached to the chamfered portions of the conductor 12, so that a strong insulating coating can be formed.

[0021] (Insulation coating peeling process flow) The flow of the process for removing the insulating coating 13 from the rectangular wire 10 will be described with reference to Fig. 2. Fig. 2 is a flow chart showing an example of the procedure for removing the insulating coating from the rectangular wire.

[0022] First, the insulating coating 13 is peeled off over a predetermined range R along the long side 14a of the rectangular wire 10 (step S1). The processing method performed in step S1 will be described in detail later (see FIG. 3). The process in step S1 is an example of a first peeling process in the present disclosure.

[0023] Next, a moving process is performed to move the positions of the ridges (corners) at both ends of the long side 14a from which the insulating coating 13 has been peeled off slightly outward over a predetermined range R (step S2). The processing method performed in step S2 will be described in detail later (see FIG. 4a). The process in step S2 is an example of a corner moving process in the present disclosure.

[0024] Next, chamfering is performed to form chamfered portion 16a at the corner including the ridge line moved outward in step S2 (step S3). The processing method performed in step S3 will be described in detail later (see FIG. 5). The process in step S3 is an example of the chamfering process in the present disclosure.

[0025] Next, the insulating coating 13 is peeled off along the short side 14b of the rectangular wire 10 (step S4). The processing method performed in step S4 will be described in detail later (see FIG. 6). The process in step S4 is an example of a second peeling process in the present disclosure.

[0026] Next, recess processing is performed (step S5) to form recesses 20a, 20b (see FIG. 7) and chamfered portion 16b on both side surfaces of conductor 12. The processing method performed in step S5 will be described in detail later (see FIG. 7).

[0027] Finally, the conductor 12 is cut at a position passing through the depressions 20a and 20b, and a chamfering process is performed to form the chamfered portion 16c at the cut position (step S6). The processing method performed in step S6 will be described in detail later (see FIG. 8).

[0028] (Peeling of the insulation coating along the long side) The first peeling step of peeling off the insulating coating 13 along the long side 14a of the rectangular wire 10, which is performed in step S1 of Fig. 2, will be described in detail with reference to Fig. 3. Fig. 3 is a diagram for explaining a method of peeling off the insulating coating on the long side of the rectangular wire. Note that the rectangular wire 10 is arranged along the X-axis, with the long side 14a (see Fig. 1) parallel to the Y-axis and the short side 14b (see Fig. 1) parallel to the Z-axis.

[0029] As shown in Fig. 3(a), the rectangular wire 10 before processing is elongated along the X-axis. Here, the insulating coating 13 is peeled off along the long side 14a over a predetermined range R of the rectangular wire 10.

[0030] As shown in the AA cross section, the rectangular wire 10 has a conductor 12 covered with an insulating coating 13.

[0031] As shown in FIG. 3(b), the insulating coating 13 is peeled off by placing the cutting blades 30a and 30b over a predetermined range R against the insulating coating 13 on the surface of the rectangular wire 10 and moving them in the direction along the long side 14a, i.e., along the Y-axis. Specifically, as shown in the BB cross-sectional view, the pad 33 is pressed against the Y-axis negative side of the rectangular wire 10, and the lower die 34 is pressed against the Y-axis positive side, and the cutting blade 30a is moved from the Y-axis negative side to the Y-axis positive side along the surface of the rectangular wire 10 on the Z-axis negative side. Also, the cutting blade 30b is moved from the Y-axis negative side to the Y-axis positive side along the surface of the rectangular wire 10 on the Z-axis positive side. As a result, the cutting blades 30a and 30b each cut the insulating coating 13 along the XY plane of the rectangular wire 10 over a predetermined range R.

[0032] As a result, the conductor 12 is exposed in a region of a predetermined range R, as shown in FIG.

[0033] (Moving corner processing) 4A and 4B, the corner moving step of moving the corner of the rectangular wire 10 performed in step S2 in Fig. 2 will be described in detail. Fig. 4A is a diagram explaining a method of moving the corner of the rectangular wire. Fig. 4B is a diagram showing another form of a curved blade used in moving the corner of the rectangular wire.

[0034] In this step, as shown in FIG. 4A(a), the rectangular wire 10 is molded (for example, plastically deformed by coining) by pressing the die 40a against it from the negative side of the Z axis. Also, molding is performed by pressing the die 40b against it from the positive side of the Z axis. At the tip of the die 40a, curved blades 42a and 43a of equal height are formed over a predetermined range R. The curved blades 42a and 43a have a smaller cross-sectional area toward the tip (positive side of the Z axis), and the tips of the curved blades 42a and 43a make line contact with the conductor 12 along the X axis over the predetermined range R of the rectangular wire 10. The curved blades 42a and 43a have the inner edge along the Z axis and the outer edge at an angle of about 45°. The curved blades 42a and 43a are pressed against the vicinity of the boundary between the insulating coating 13 and the conductor 12 formed on the short side (side along the Z-axis) of the rectangular wire 10. Here, the dies 40a and 40b are an example of a first die in the present disclosure. The curved blades 42a and 43a are an example of an abutment portion in the present disclosure.

[0035] In addition, the tip of the die 40b is also formed with curved blades 42b and 43b of equal height over a predetermined range R. The curved blades 42b and 43b have a smaller cross-sectional area toward the tip (negative side of the Z axis), and the tips of the curved blades 42b and 43b make line contact with the conductor 12 along the X axis over the predetermined range R of the rectangular wire 10. The inside of the tip of each of the curved blades 42b and 43b is along the Z axis, and the outside of the tip has an angle of about 45°. The curved blades 42b and 43b are each pressed against the vicinity of the boundary between the insulating coating 13 formed on the short side (side along the Z axis) of the rectangular wire 10 and the conductor 12. Here, the curved blades 42b and 43b are an example of abutting parts in this disclosure.

[0036] By pressing the curved blades 42a, 43a and the curved blades 42b, 43b against the rectangular wire 10, the rectangular wire 10 is plastically deformed toward the outside of the cutting edge. This plastic deformation causes the position of the ridge line 18 that forms the corner of the rectangular wire 10 along the X-axis to move from the position shown in FIG. 4A(a) to the position shown in FIG. 4A(b), that is, outward in the Y-axis direction. This causes the ridge line 18 to move to the position of the ridge line 18a. Note that the pressing amount between the curved blades 42a, 43a and the curved blades 42b, 43b is small, so the amount of plastic deformation of the rectangular wire 10 is also small, as shown in FIG. 4A(b).

[0037] The angle of the cutting edge of the curved blade used for moving the corner is not limited to 45°. For example, as shown in Fig. 4B, even if the inside and outside of the cutting edge have angles of 45° and the cutting edge angle is 90°, the position of the ridge line 18 of the rectangular wire 10 can be moved to the position of the ridge line 18a, as in Fig. 4A(b).

[0038] (Corner chamfering) The corner chamfering process performed in step S3 in Fig. 2 will be described in detail with reference to Fig. 5. Fig. 5 is a diagram illustrating a method for chamfering the corners of a rectangular wire.

[0039] In this step, the four corners (areas including the ridge lines 18a) moved by the above-described corner moving process are plastically deformed along the Z axis, thereby performing chamfering.

[0040] The chamfering is performed by pressing the die 50a against the rectangular wire 10 from the negative side of the Z axis and pressing the die 50b against the rectangular wire 10 from the positive side of the Z axis, and forming (for example, plastic deformation by coining). At the tip of the die 50a, curved blades 52a and 53a of equal height are formed over a predetermined range R. The curved blades 52a and 53a have inclined surfaces at an angle of about 25° with respect to the Y axis direction. The inclination of the inclined surfaces is not limited to 25°, and an appropriate angle is selected depending on the rectangular wire 10 to be processed.

[0041] The inclined surfaces of the curved blades 52a and 53a of the die 50a are pressed against the corners of the rectangular wire 10, forming chamfered portions 16a at the corners of the rectangular wire 10, as shown in Fig. 5(b). At this time, the position of the ridge line 18a that has moved outward due to the moving processing of the corners is also plastically deformed along the Z axis, and moves to the positive side of the Z axis, as shown in Fig. 5(b).

[0042] The die 50b also includes a curved blade 52b and a curved blade 53b having the same structure as the die 50a. The curved blade 52b and the curved blade 53b are pressed against the rectangular wire 10 from the positive side of the Z axis to form the chamfered portion 16a.

[0043] (Peeling of insulation coating along the short side) The second peeling step of peeling off the insulating coating 13 along the short side 14b of the rectangular wire 10, which is performed in step S4 of Fig. 2, will be described in detail with reference to Fig. 6. Fig. 6 is a diagram for explaining a method of peeling off the insulating coating on the short side of the rectangular wire.

[0044] In this step, after the above-mentioned chamfering is completed, the insulating coating 13 is peeled off over a predetermined range R of the rectangular wire 10 along the short side (side along the Z-axis) of the rectangular wire 10.

[0045] As shown in FIG. 6(a), the insulating coating 13 is peeled off by placing the cutting blades 60a and 60b over a predetermined range R near the boundary between the conductor 12 and the insulating coating 13 of the chamfered rectangular wire 10 and moving them in the Z-axis direction. At this time, the pad 63 is pressed against the Z-axis negative side of the rectangular wire 10, and the lower die 64 is pressed against the Z-axis positive side, and the cutting blades 60a and 60b are moved from the Z-axis negative side to the Z-axis positive side along both the left and right side surfaces of the rectangular wire 10. As a result, the cutting blades 60a and 60b each cut the insulating coating 13 along the XZ plane of the rectangular wire 10. At this time, the boundary between the conductor 12 and the insulating coating 13 is plastically deformed outward in the Y-axis direction due to the chamfering of the corners described above, so that when the insulating coating 13 is peeled off by the cutting blades 60a and 60b, no remaining insulating coating 13 is generated.

[0046] (Dimple processing) The dent processing performed in step S5 in Fig. 2 will be described in detail with reference to Fig. 7. Fig. 7 is a diagram for explaining a method of dent processing of a rectangular wire.

[0047] In this step, recesses 20a and 20b are formed along the Z axis at approximately the center of the left and right side surfaces along the XZ plane of conductor 12 from which insulating coating 13 has been peeled off.

[0048] The depressions 20a and 20b are formed by pressing a die 70a having a curved blade 72a and a die 70b having a curved blade 72b shown in FIG. 7(a) against the rectangular wire 10 from the negative side of the Z axis.

[0049] The curved blades 72a and 72b have an approximately U-shape, and by pressing against the conductor 12 of the rectangular wire 10, they crush parts of the left and right side surfaces of the conductor 12 into an approximately U-shape as shown in Fig. 7(b). This forms the recesses 20a and 20b. At the bases of the recesses 20a and 20b, chamfered portions 16b are formed at the left and right side surfaces of the conductor 12, respectively.

[0050] (Cutting and chamfering of rectangular wire) The cutting and chamfering of the rectangular wire 10 performed in step S6 in Fig. 2 will be described in detail with reference to Fig. 8. Fig. 8 is a diagram for explaining a method of cutting and chamfering the rectangular wire.

[0051] In this step, the conductor 12 is cut at the positions of the depressions 20a and 20b formed by the depression processing.

[0052] As shown in FIG. 8(a), the conductor 12 is cut by moving a cutting blade 80 pressed against the position of the depression 20b along the Y axis to the position of the depression 20a.

[0053] The cutting blade 80 has an inclined portion 80a and an inclined portion 80b on the negative side of the Z axis. The inclined portions 80a and 80b form a chamfered portion 16c shown in Fig. 8(b) at the cut edge of the cut conductor 12 along the Y axis.

[0054] The cutting blade 80 also has an inclined portion 80c and an inclined portion 80d on the positive side of the Z axis. The inclined portions 80c and 80d form a chamfered portion 16c along the Y axis at the cut edge of the cut conductor 12.

[0055] By performing the above-described processing from step S1 to step S6 at a predetermined interval of the rectangular wire 10, a plurality of rectangular wires 10 with the conductor 12 exposed at both ends are formed. These plurality of rectangular wires 10 are arranged adjacent to each other around the stator core. Then, the ends of the adjacent rectangular wires 10 are welded to each other to form a stator coil wound around the stator core.

[0056] (Effects of this embodiment) As described above, the insulating coating peeling method of the rectangular wire according to the present embodiment includes a first peeling step of peeling the insulating coating 13 of the two opposing sides (long sides 14a) of the rectangular wire 10 over a predetermined range R along the length of the rectangular wire 10, a corner moving step of moving the positions of the ridge lines 18 formed by both end points of the long sides 14a along the length of the rectangular wire 10 outward over a predetermined range R, a chamfering step of forming a chamfered portion 16a at the corner including the ridge line 18 moved outward over the predetermined range R, and a second peeling step of peeling the insulating coating 13 of the short side 14b perpendicular to the long side 14a of the rectangular wire 10 over a predetermined range R in this order. Therefore, the insulating coating 13 of the rectangular wire 10 can be peeled off without leaving any residue.

[0057] In addition, in the method for stripping the insulating coating from the rectangular wire according to the present embodiment, the corner moving step presses a die 40a (first die) having curved blades 42a, 43a (butting parts) with a smaller cross-sectional area toward the tip along the length direction of the rectangular wire 10 in the vicinity of the ridge line 18 of the two opposing sides (long sides 14a) of the rectangular wire 10 over a predetermined range R, and a die 40b (first die) having curved blades 42b, 43b (butting parts). Therefore, the region including the corner of the rectangular wire 10 can be moved outward by plastically deforming it. This allows the insulating coating 13 to be stripped without leaving any part of it remaining when the insulating coating 13 along the short side 14b is stripped in a later step. In addition, since the processing is performed with the curved blades 42a, 43a, 42b, 43b instead of the cutting blade, the life of the blade can be extended.

[0058] (Modification of the embodiment) Another method for moving the corner of the rectangular wire 10 will be described with reference to Fig. 9. Fig. 9 is a diagram for explaining another method for moving the corner of the rectangular wire.

[0059] FIG. 4A illustrates a method of pressing curved blade 42a and curved blade 43a formed at the tip of mold 40a over a predetermined range R along the X-axis against flat wire 10 to perform moving processing of the corner portion, but the method of performing moving processing of the corner portion is not limited to this.

[0060] For example, as shown in Figure 9(a), the position of the ridge line 18 formed by the corner of the rectangular wire 10 can be moved outward by pressing a mold 90a having a curved blade 92a at its tip, which extends over a predetermined range R along the X-axis, against approximately the center of the long side of the rectangular wire 10.

[0061] The cross-sectional area of ​​the curved blade 92a decreases toward the tip (positive side of the Z axis), and the tip of the curved blade 92a makes line contact with the conductor 12 along the X axis over a predetermined range R of the rectangular wire 10. The tip of the curved blade 92a is inclined at 30° to the Z axis on both sides of the cutting edge. In other words, the angle of the cutting edge is approximately 60°.

[0062] By pressing such a curved blade 92a against the conductor 12 of the rectangular wire 10, the conductor 12 is plastically deformed. This plastic deformation is transmitted left and right along the Y axis from the point where the curved blade 92a is pressed, and the position of the ridge line 18 moves to the position of the ridge line 18a shown in Fig. 9(b). In other words, the same processing as the moving processing of the corner explained in Fig. 4A can be performed.

[0063] Similarly, the back side of the rectangular wire 10 can be processed by pressing the curved blade 92b formed at the tip of the die 90b against the corners. Here, the dies 90a and 90b are an example of the second die in this disclosure. The curved blades 92a and 92b are an example of the abutment in this disclosure.

[0064] (Effects of the Modification of the Present Embodiment) As described above, in the method for stripping the insulating coating from a rectangular wire according to the modified embodiment of the present invention, the corner moving step presses the dies 90a, 90b (second dies) having curved blades 92a, 92b (butting parts) with a smaller cross-sectional area toward the tip along the length direction of the rectangular wire 10, respectively, over a predetermined range R at approximately the center of each of the two opposing sides (long sides 14a) of the rectangular wire 10. Therefore, the region including the corner of the rectangular wire 10 can be moved outward by plastically deforming it. This allows the insulating coating 13 to be stripped without leaving any part of it remaining when the insulating coating 13 along the short side 14b is stripped in a later step. In addition, since the processing is performed with the curved blades 92a, 92b instead of the cutting blade, the life of the blade can be extended.

[0065] Although the embodiment of the present invention has been described above, the above-mentioned embodiment is presented as an example and is not intended to limit the scope of the present invention. This new embodiment can be embodied in various other forms. In addition, various omissions, substitutions, and modifications can be made without departing from the gist of the invention. In addition, this embodiment is included in the scope and gist of the invention, and is included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0066] 10. Rectangular wire 12 Conductors 13 Insulation coating 14a Long side 14b Short side 15a Upper and lower surfaces 15b Left and right sides 15c Tip surface 16a,16b,16c Chamfered part 18,18a Ridgeline 20a, 20b recess 30a,30b,60a,60b cutting edge 33,63 putt 34,64 Lower mold 40a, 40b, 44a type (first type) 42a, 42b, 43a, 43b, 46a, 47a Curved blade (butt part) 50a,50b type 52a,53a,52b,53b curved blade 70a,70b type 72a,72b curved blade 80 Cutting edge 80a,80b,80c,80d Slope part Type 90a, 90b (second type) 92a,92b Curved blade (butt part) R Predetermined range

Claims

1. A first peeling step of peeling off the insulating coating on two opposing sides of the rectangular wire over a predetermined range along the length of the rectangular wire; a corner moving step of moving the positions of the ridge lines formed by both end points of the two sides along the length direction of the rectangular wire outward over the predetermined range; a chamfering step of forming a chamfered portion at a corner including the ridge line that has been moved outward over the predetermined range; a second peeling step of peeling off the insulating coating on two sides of the rectangular wire perpendicular to the two sides over the predetermined range. How to remove the insulation coating from rectangular wire.

2. The corner portion moving step includes: A first die having abutting portions each having a cross-sectional area smaller toward a tip is pressed against the ridge lines of two opposing sides of the rectangular wire over the predetermined range along the length direction of the rectangular wire. A method for stripping the insulating coating of a rectangular wire according to claim 1.

3. The corner portion moving step includes: A second die having abutting portions each having a cross-sectional area that is smaller toward the tip is pressed against the respective centers of two opposing sides of the rectangular wire along the length direction of the rectangular wire over the predetermined range. A method for stripping the insulating coating of a rectangular wire according to claim 1.

Images