FILM REMOVAL DEVICE and FILM REMOVAL METHOD

Abstract

The cutting edge portion of the cutting body in the die of the film removal device comprises a first cutting start portion, a second cutting start portion, at least one first cutting edge chamfer, and at least one second cutting edge chamfer, the cutting edge tips being inclined relative to the width direction of the cutting body when viewed in the thickness direction. The first cutting start portion and the first cutting edge chamfer are arranged successively along the cutting edge portion from one end to the other in the width direction. The second cutting start portion and the second cutting edge chamfer are arranged successively along the cutting edge portion from the other end to one end in the width direction. When the cutting body is viewed in the thickness direction, the angle of inclination of the cutting edge tip of the first cutting start portion relative to the width direction is smaller than the angle of inclination of the cutting edge tip of the first cutting edge chamfer relative to the width direction.When the cutting body is viewed in the thickness direction, the angle of inclination of the cutting edge tip of the second starting part of the cut to the width direction is smaller than the angle of inclination of the cutting edge tip of the second cutting edge chamfer to the width direction.

Description

TECHNICAL AREA

[0001] The present invention relates to a film removal device and a film removal method. BACKGROUND TECHNOLOGY

[0002] Insulating film removal devices for removing insulating films from a conductor are known. One such device is a film peeling device in which a punch with a pair of parallel peeling edges is moved toward a die to cut a side face of a flat wire arranged between the punch and the die, thereby peeling the film from the side face (e.g., Patent Document 1). In the film peeling device, the cutting edges of a pair of peeling edges are formed in a concave shape, symmetrically concave from the center to both ends. Identified font patent document

[0003] Patent document 1: JP 2019-115108 A Further prior art is represented by documents DE 10 2019 108 950 A1 and DD 1 27 009 A1. OVERVIEW OF THE INVENTION TASK TO BE SOLVED BY THE INVENTION

[0004] By angling the cutting edge tip of a plate-shaped cutting body in the lateral direction, as in the aforementioned device for peeling films, the area of ​​the cutting edge tip in contact with the conductor can be reduced. This improves the accuracy when removing the insulating film.

[0005] If, however, the insulating film on the conductor is removed with a cutting tool that has a cutting edge tip angled to the width direction, the travel distance for moving the cutting tool relative to the conductor must be increased compared to a cutting tool with a cutting edge tip parallel to the width direction. Therefore, the time required to remove the insulating film is longer and the work efficiency is lower.

[0006] With a cutting element featuring a cutting edge tip angled in the width direction, the portion of the cutting edge tip that first comes into contact with the conductor is subject to a reaction force from the conductor and wears down more easily than other parts. Consequently, the removal accuracy of the insulating film at the conductor boundary between the section with the insulating film and the section from which the insulating film has been removed is slightly reduced. Therefore, a film removal device is needed that can efficiently remove the insulating film and also counteract this decrease in the removal accuracy.

[0007] The purpose of the present invention is to provide a film removal device that can efficiently remove the insulating film and also suppress a decrease in the distance accuracy of the insulating film. MEANS TO SOLVENT THE TASK

[0008] A film removal device according to one embodiment of the present invention is a film removal device for removing an insulating film from the side surface of a conductor wire by means of a punch having a cutting element and a die. The punch is movable relative to the die. The cutting element is plate-shaped and has a cutting edge portion at its leading end in the direction of movement of the punch. The cutting edge portion comprises a first cutting start portion, a second cutting start portion, at least one first cutting edge chamfer, and at least one second cutting edge chamfer, wherein the cutting edge tips, viewed in the thickness direction, are each inclined to the width direction of the cutting element. The first cutting start portion and the first cutting edge chamfer are arranged successively along the cutting edge portion from one end to the other in the width direction.The second cutting start section and the second cutting edge chamfer are arranged successively along the cutting edge section, from the opposite end to the first end, in the width direction. When the cutting body is viewed in the thickness direction, the angle of inclination of the cutting edge tip of the first cutting start section to the width direction is smaller than the angle of inclination of the cutting edge tip of the first cutting edge chamfer to the width direction. Similarly, when the cutting body is viewed in the thickness direction, the angle of inclination of the cutting edge tip of the second cutting start section to the width direction is smaller than the angle of inclination of the cutting edge tip of the second cutting edge chamfer to the width direction.

[0009] A film removal method according to an embodiment of the present invention is a film removal method for removing an insulating film from the side surface of a conductor wire using the film removal device. The film removal method comprises: a positioning step in which the conductor wire is positioned by a positioning part of the die at a position where the cutting edge portion in the cutting body of the punch overlaps the conductor of the conductor wire when the punch is viewed in the direction of movement; and an insulating film removal step in which, by moving the punch towards the die, an insulating film is removed in a predetermined area within the insulating film on the side surface of the conductor wire. The insulating film removal step comprises: a first initial cutting step,in which a boundary at one end in the longitudinal direction of the side surface of the conductor wire in the specified area is formed by the first cutting start part of the cutting edge part, a second cutting start step in which a boundary at the other end in the longitudinal direction of the side surface of the conductor wire in the specified area is formed by the second cutting start part of the cutting edge part, a first insulating film removal step in which a portion of the insulating film in the specified area, which is positioned closer to the boundary at the other end than the boundary at one end, is removed by the first cutting edge bevel of the cutting edge part, and a second insulating film removal step in which a portion of the insulating film in the specified area, which is positioned closer to the boundary at one end than the boundary at the other end, is removed by the second cutting edge bevel of the cutting edge part.

[0010] A motor according to the disclosure comprises: a stator having a stator core with multiple slots extending axially, a conductor, an insulating film covering the conductor, and multiple conductor wires partially enclosed in the multiple slots, and a rotor rotating about an axis of the stator. The conductor wire comprises: a coated portion in which the conductor is covered by the insulating film, an exposed portion in which the conductor is exposed, and a stepped portion positioned between the coated portion and the exposed portion. The boundary portion between the stepped portion and the coated portion extends in a straight line orthogonal to the direction of extension of the conductor wire. EFFECTS OF INVENTION

[0011] According to one embodiment of the present invention, it is possible to provide a film removal device that can efficiently remove the insulating film of the conductor wire and suppress a decrease in the distance accuracy of the insulating film. BRIEF EXPLANATION OF THE DRAWINGS Fig. Figure 1 shows a perspective view of the overview of the conductor wire; Fig. Figure 2 shows the overview of the film removal device according to embodiment 1; Fig. Figure 3 shows a representation of the film removal device seen in the thickness direction of the cutting body of the punch; Fig. Figure 4 shows a perspective view of the overview of the cutting body of the punch; Fig. Figure 5 shows a representation of the die as seen in the direction of movement of the stamp; Fig. Figure 6 shows a diagram illustrating the relationship between the die insertion hole and the cutting edge portion of the punch; Fig. Figure 7 shows a diagram illustrating the position of the cutting body in relation to the conductor wire; Fig. Figure 8 shows a representation of the cutting edge part seen in the thickness direction of the cutting body according to embodiment 1; Fig. Figure 9A shows an enlarged partial view of Fig. 8; Fig. Figure 9B shows an enlarged partial view of Fig. 8; Fig. Figure 10A shows a diagram illustrating the removal of the insulating film from the conductor wire by the cutting element; Fig. Figure 10B shows a diagram illustrating the removal of the insulating film from the conductor wire by the cutting element; Fig. Figure 10C shows a diagram illustrating the removal of the insulating film from the conductor wire by the cutting element; Fig. Figure 11 shows a diagram illustrating the relationship between the cutting body and the conductor wire; Fig. Figure 12 shows an enlarged partial view of Fig. 11; Fig. Figure 13 shows a perspective view of the conductor wire with the insulating film removed; Fig. Figure 14 shows a representation of the cutting edge portion seen in the thickness direction of the cutting body according to a modified example; Fig. Figure 15 shows a representation of the cutting edge portion seen in the thickness direction of the cutting body according to a modified example; Fig. Figure 16 shows a representation of the cutting edge portion seen in the thickness direction of the cutting body according to a modified example; Fig. Figure 17 shows a schematic representation of the engine overview; Fig. Figure 18 shows a perspective view that schematically illustrates an example of the positional relationship between the stator core and the stator coil; and Fig. Figure 19 shows an enlarged partial view of the stator. EXECUTION FORMS

[0012] The exemplary embodiments of the present invention are explained in more detail below with reference to the drawings. Identical or corresponding parts are marked with the same symbols in the drawings, and the explanation is not repeated. The dimensions of the components in the respective drawings do not accurately represent the actual dimensions of the components or the relative sizes of the individual components.

[0013] In the following explanations, the terms "fixing," "connecting," and "attaching" (hereinafter "fixing," etc.) are used not only when the components are directly fixed to one another, but also when the components are fixed to one another via other components, etc. That is to say, in the following explanation, the terms "fixing, etc." encompass both direct and indirect fixing, etc., between the components. (Version 1)(Design of the film removal device)

[0014] With reference to drawings 1 to 9B, a film removal device 1 according to an exemplary embodiment of the present invention is described. The film removal device 1 is a device for removing an insulating film 52 covering the side surface of a conductor wire 50. The conductor wire 50 is used, for example, in a stator coil of a motor.

[0015] First, the conductor wire 50 is selected using... Fig. 1. Briefly explained. As in Fig. As shown in Figure 1, the conductor wire 50 has a conductor 51 and an insulating film 52. The conductor wire 50 is, for example, a flat wire. That is, before the insulating film is removed by the film removal device 1, the conductor 51 has a rectangular shape when viewed in section perpendicular to its direction of extension. The insulating film 52 covers the side surface of the conductor 51. The insulating film 52 is formed, for example, by applying an insulating resin to the outer circumferential surface of the conductor 51 and baking it on. The conductor wire can be a round wire or a true square wire, etc.

[0016] The conductor wire 50 has a coated section 61, the side surfaces of which are covered by the insulating film 52, and an exposed section 62, the side surfaces of which are not covered by the insulating film 52. The conductor wire 50 is insulated in the coated section 61, which is covered by the insulating film 52. The conductor wire 50 is not insulated in the exposed section 62, where the conductor 51 is exposed. In the case of the conductor wire 50, which is used, for example, in a motor, the insulating film 52 is removed at the wire end 50a. Several conductor wires 50 are electrically connected between their wire ends 50a by welding, etc.

[0017] The exposed part 62 is formed by cutting the side surface in a predetermined area in the direction of extension of the conductor wire 50 in the conductor wire 50 in which the insulating film 52 is formed on the side surface, using the film removal device 1. The conductor wire 50 therefore has a step section 63 between the coating section 61 and the exposed part 62.

[0018] The outer circumferential surface of the step section 63 consists of an inclined surface that is inclined with respect to the direction of extension of the conductor wire 50. The boundary section 61a between the step section 63 and the coating section 61 extends in a straight line in a direction orthogonal to the direction of extension of the conductor wire 50.

[0019] The wire end 50a of the conductor wire 50 is obtained by cutting the exposed part 62 of the conductor wire 50, which is formed by the film removal device 1, at the middle part in the extension direction of the conductor wire 50. (Explanation of die and stamp training)

[0020] Next, an exemplary film removal device 1 according to the present embodiment will be explained with reference to drawings 2 to 9B. The film removal device 1 is a device for removing an insulating film 52 covering the side face of a conductor wire 50.

[0021] As in Fig. 2 and Fig. As shown in Figure 3, the film removal device 1 comprises a punch 2 and a die 3. The punch 2 moves from a position away from the die 3 towards the die 3. As the punch 2 moves towards the die 3, it comes into contact with the conductor wire 50, which is arranged on a base 3a of the die 3, and removes the insulating film 52 covering the side surface of the conductor wire 50. In the following explanation, "front direction" in the direction of movement Z of the punch 2 means the direction in which the punch 2 moves towards the conductor wire 50 arranged on the base 3a of the die 3.

[0022] The punch 2 has a pair of cutting elements 21. The pair of cutting elements 21 are each plate-shaped. The pair of cutting elements 21 are arranged in a row in the thickness direction. The pair of cutting elements 21 are arranged parallel to each other with a gap between them. The cutting element 21 has a cutting edge portion 22 at its front end in the direction of movement Z. The detailed design of the cutting edge portion 22 is explained below.

[0023] As in Fig. As shown in Figure 4, in the present embodiment, the cutting body 21, when viewed in the direction of movement Z, has an inclined surface 21b at the connecting part between a surface 21a in the thickness direction and the two end surfaces in the width direction W. The cutting body 21 has a cutting edge tip at the corner between the surface 21a in the thickness direction and the front end surface in the direction of movement Z, and at the corner between the inclined surface 21b and the front end surface in the direction of movement Z. As shown in Figure 4, the cutting body 21 has a cutting edge tip at the corner between the surface 21a in the thickness direction and the front end surface in the direction of movement Z. Fig. As shown in Figure 2, the two blade bodies 21 with surfaces 21a are facing each other.

[0024] As in Fig. 3 and Fig. As shown in Figure 5, in the present embodiment, the die 3, when viewed from the direction of movement Z of the punch 2, is long in a direction that intersects the alignment direction of the pair of cutting elements 21. On the base 3a of the die 3, the guide wire 50 is positioned such that its extension direction is perpendicular to the direction of movement Z of the punch 2 and coincides with the width direction W of the cutting elements 21 of the punch 2.

[0025] As in Fig. 2 and Fig. As shown in Figure 3, the two-sided parts of the conductor wire 50, which is placed on the base 3a in the position mentioned above, overlap the pair of cutting elements 21 when the punch 2 is viewed in the direction of movement Z. That is, the conductor wire 50 is positioned in such a way that the pair of cutting elements 21 overlaps the two-sided parts of the conductor wire 50 in the transverse direction when the punch 2 is viewed in the direction of movement Z.

[0026] The base 3a of the die 3 need not be parallel to the ground. The base of the die can be a plane inclined to the ground or perpendicular to the ground. The base of the die may have irregularities. The position of the conductor wire 50 in relation to the die 3 is in Fig. 5 is represented by a two-point dashed line.

[0027] As in Fig. 2 and Fig. As shown in Figure 3, the die 3 has a pair of insertion holes 32 extending in the direction of movement Z of the punch 2. Viewed in the direction of movement Z, the pair of insertion holes 32 is positioned on both sides in the width direction of the conductor wire 50 with respect to the conductor wire 50 arranged on the base 3a. As shown in Fig. As shown in Figure 6, the cutting edge part 22 of the punch 2, which is moved forward in the direction of movement Z, is inserted into the insertion hole 32.

[0028] As the punch 2 moves forward in the direction of movement Z, the pair of cutting elements 21 cuts the two sides of the conductor wire 50. That is, the pair of cutting elements 21 removes the insulating film 52 under the insulating film 52 on the side surface of the conductor wire 50 in the area R that overlaps the pair of cutting elements 21 as seen in the direction of movement Z.

[0029] In the present embodiment, the die 3 has a positioning element 31 for positioning the conductor wire 50. The positioning element 31 is, for example, a groove 31a that forms the base 3a of the die 3. The groove 31a extends longitudinally along the die 3. The conductor wire 50 is inserted into the groove 31a. This allows the conductor wire 50 to be easily positioned in a predetermined position on the base 3a.

[0030] Fig. Figure 7 shows a representation of the conductor wire 50 positioned on the base 3a of the die 3 and a pair of cutting elements 21 of the punch 2 when viewed in the direction of movement Z. In the present embodiment, the positioning part 31 positions the conductor wire 50 in a position in which the cutting edge part 22 of the punch 2 overlaps the conductor 51 of the conductor wire 50 when viewed in the direction of movement Z.

[0031] Consequently, during the forward movement of the punch 2 in the direction of movement Z, a portion of the insulating film 52 and the conductor 51 contained within the part of the conductor wire 50 that overlaps the pair of cutting elements 21 when viewed in the direction of movement Z is removed. In this way, the film removal device 1 removes not only the insulating film 52 but also a portion of the conductor 51 from the conductor wire 50. This allows the insulating film 52 to be removed more reliably by the film removal device 1. (Shape of cutting edge part)

[0032] The shape of the exemplary cutting edge part 22 of the present embodiment is determined by reference to Fig. Sections 8 to 9B are explained in more detail.

[0033] In the present embodiment, the cutting edge portion 22 has a first cutting start portion 23, a second cutting start portion 24, two first cutting edge chamfers 25, and two second cutting edge chamfers 26. In the present embodiment, from one end W1 to the other end W2 of the width direction W of the cutting body 21, the first cutting start portion 23, a first cutting edge chamfer 25, a second cutting edge chamfer 26, and the second cutting start portion 24 are arranged in this order.

[0034] As in Fig. As shown in Figure 9A, the cutting edge tip 23a of the first cutting start part 23 is inclined to the width direction W. One end W1 of the cutting edge tip 23a of the first cutting start part 23 is positioned in the direction of movement Z in front of the other end W2.

[0035] The cutting edge tip 25a of the first cutting edge chamfer 25 is inclined to the width direction W of the cutting body 21. One end W1 of the cutting edge tip 25a of the first cutting edge chamfer 25 is positioned in the direction of movement Z in front of the other end W2.

[0036] The angle of inclination D23 of the cutting edge tip 23a of the first cutting start part 23 to the width direction W is smaller than the angle of inclination D25 of the cutting edge tip 25a of the first cutting edge chamfer 25 to the width direction W. The angle of inclination D23 is, for example, 20 degrees. The angle of inclination D25 is, for example, 45 degrees.

[0037] As in Fig. As shown in Figure 9B, the cutting edge tip 24a of the second cutting start part 24 is inclined to the width direction W. The other end W2 of the cutting edge tip 24a of the second cutting start part 24 is positioned in the direction of movement Z in front of one end W1.

[0038] The cutting edge tip 26a of the second cutting edge chamfer 26 is inclined to the width direction W. The other end W2 of the cutting edge tip 26a of the second cutting edge chamfer 26 is positioned in the direction of movement Z in front of one end W1.

[0039] The angle of inclination D24 of the cutting edge tip 24a of the second cutting start part 24 to the width direction W is smaller than the angle of inclination D26 of the cutting edge tip 26a of the second cutting edge chamfer 26 to the width direction W. The angle of inclination D24 is, for example, 20 degrees. The angle of inclination D26 is, for example, 45 degrees.

[0040] As in Fig. As shown in Figure 8, in the present embodiment the length in the width direction W of the first cutting start part 23 is shorter than the length in the width direction W of the first cutting edge chamfer 25. The length in the width direction W of the second cutting start part 24 is shorter than the length in the width direction W of the second cutting edge chamfer 26.

[0041] The film removal device 1 of the present embodiment described above is a film removal device 1 for removing the insulating film 52 from the side surface of the conductor wire 50 by means of the punch 2 including the cutting element 21 and the die 3. The punch 2 is movable in the direction of the die 3. The cutting element 21 is plate-shaped with the cutting edge portion 22 at the leading end of the punch 2 in the direction of movement Z. The cutting edge portion 22 has the first cutting start portion 23, the second cutting start portion 24, at least one first cutting edge chamfer 25 and at least one second cutting edge chamfer 26, wherein the cutting edge tips 23a, 24a, 25a, 26a are each inclined in the thickness direction to the width direction W of the cutting element 21 when viewed in the thickness direction.The first cutting start section 23 and the first cutting edge chamfer 25 are arranged one after the other from one end W1 to the other end W2 in the width direction W of the cutting edge section 22. The second cutting start section 24 and the second cutting edge chamfer 26 are arranged one after the other from the other end W2 to one end W1 in the width direction W of the cutting edge section 22. When considering the cutting body 21 in the thickness direction, the inclination angle D23 of the cutting edge tip 23a of the first cutting start part 23 to the width direction W is smaller than the inclination angle D25 of the cutting edge tip 25a of the first cutting edge chamfer 25 to the width direction W. When considering the cutting body 21 in the thickness direction, the inclination angle D24 of the cutting edge tip 24a of the second cutting start part 24 to the width direction W is smaller than the inclination angle D26 of the cutting edge tip 26a of the second cutting edge chamfer 26 to the width direction W.

[0042] In the film removal device 1 with the configuration described above, at one end W1 of the cutting edge portion 22, one end W1 of the first cutting start portion 23 projects towards the die 3 in the width direction W. Therefore, when the punch 2 moves towards the die 3, the cutting edge tip 23a of the first cutting start portion 23 forms a cut in the insulating film 52 on the side surface of the conductor wire 50. At the other end W2 of the cutting edge portion 22, the other end W2 of the second cutting start portion 24 projects towards the die 3 in the width direction W. Therefore, when the punch 2 moves towards the die 3, the cutting edge tip 24a of the second cutting start portion 24 forms a cut in the insulating film 52 on the side surface of the conductor wire 50.The aforementioned cut, formed by the first cut start part 23, is the boundary R1 on one side in the longitudinal direction in the region R of the insulating film 52 to be removed from the conductor wire 50. The aforementioned cut, formed by the second cut start part 24, is the boundary R2 on the other side in the longitudinal direction in the region R of the insulating film 52 to be removed from the conductor wire 50.

[0043] The insulating film 52 that is closer to the other boundary R2 than to one boundary R1 is removed by the cutting edge tip 23a of the first cutting start section 23 and the cutting edge tip 25a of the first cutting edge chamfer 25, which is adjacent to the first cutting start section 23 in the width direction W. The insulating film 52 that is closer to one boundary R1 than to the other boundary R2 is removed by the cutting edge tip 24a of the second cutting start section 24 and the cutting edge tip 26a of the second cutting edge chamfer 26, which is adjacent to the second cutting start section 24 in the width direction W. This allows the insulating film 52 to be removed efficiently without increasing the travel distance of the punch 2.

[0044] Furthermore, the inclination angle D23 of the cutting edge tip 23a of the first cut start portion 23 to the width direction W is smaller than the inclination angle D25 of the cutting edge tip 25a of the first cutting edge chamfer 25 to the width direction W. This reduces the reaction force absorbed by the insulating film 52 when the cutting edge tip 23a of the first cut start portion 23 and the cutting edge tip 24a of the second cut start portion 24 form one boundary R1 and the other boundary R2. Therefore, wear or deformation of the cutting edge tip 23a of the cutting edge portion 22 can be suppressed. Consequently, it is possible to prevent a decrease in the spacing accuracy of the insulating film 52 at the boundaries R1, R2 due to wear, etc., of the cutting edge tip 23a.

[0045] Therefore, it is possible to provide the film removal device 1, which can efficiently remove the insulating film 52 and can also suppress a decrease in the distance accuracy of the insulating film 52.

[0046] In the present embodiment, the length in the width direction W of the first cutting start part 23 is shorter than the length in the width direction W of the first cutting edge chamfer 25. The length in the width direction W of the second cutting start part 24 is shorter than the length in the width direction W of the second cutting edge chamfer 26.

[0047] The cutting body, with a cutting edge tip inclined to the lateral direction W, cuts the object in the direction of movement of the cutting body while also cutting the object in the lateral direction of the cutting body. Therefore, the greater the angle of inclination of the cutting edge tip to the lateral direction, the less force is required to cut the object. Consequently, the greater the angle of inclination of the cutting body, the higher the cutting accuracy.

[0048] Consequently, the first cut start section 23, where the inclination angle D23 of the cutting edge tip 23a to the width direction W of the cutting body 21 is smaller than the inclination angle D25 in the first cutting edge bevel 25, exhibits a low distance accuracy of the insulating film 52 compared to the first cutting edge bevel 25. Similarly, the second cut start section 24, where the inclination angle D24 of the cutting edge tip 24a to the width direction W of the cutting body 21 is smaller than the inclination angle D26 in the second cutting edge bevel 26, exhibits a low distance accuracy of the insulating film 52 compared to the second cutting edge bevel 26. In the present embodiment, the area of ​​the insulating film 52 that is removed by the first cutting start part 23 and the second cutting start part 24 is smaller than the area of ​​the insulating film 52 that is removed by the first cutting edge chamfer 25 and the second cutting edge chamfer 26.Therefore, the range in which the distance accuracy decreases is smaller. Consequently, the decrease in the distance accuracy of the insulating film 52 can be suppressed.

[0049] In the present embodiment, when viewing the cutting body 21 in the thickness direction, the cutting edge tip 23a of the first cutting start portion 23 is inclined relative to the width direction W. When viewing the cutting body 21 in the thickness direction, the cutting edge tip 25a of the first cutting edge chamfer 25 is inclined at an angle of 45 degrees or more relative to the width direction W. When viewing the cutting body 21 in the thickness direction, the cutting edge tip 24a of the second cutting start portion 24 is inclined relative to the width direction W. When viewing the cutting body 21 in the thickness direction, the cutting edge tip 26a of the second cutting edge chamfer 26 is inclined at an angle of 45 degrees or more relative to the width direction W.

[0050] This enables a design in which cutting in the insulating film 52 can be initiated with less force than when the inclination angle of the cutting edge tips 23a, 24a of the first cutting start section 23 and the second cutting start section 24 to the width direction W is 0 degrees. Furthermore, the wear of the cutting edge tips 23a, 24a in the first and second cutting start sections 23 and 24 can be suppressed.

[0051] By setting the inclination angle D25 of the first cutting edge bevel 25 and the inclination angle D26 of the second cutting edge bevel 26 to 45 degrees or more, the speed at which the insulating film 52 is removed in the width direction W can be reduced relative to the movement speed of the punch 2. Consequently, the decrease in the removal accuracy of the insulating film 52 can be prevented.

[0052] In the present embodiment, the cutting edge part 22 has another first cutting edge bevel 25 and another second cutting edge bevel 26, which are arranged alternately in the width direction W, between the first cutting edge bevel 25, which is adjacent to the first cutting start part 23 in the width direction W, and the second cutting edge bevel 26, which is adjacent to the second cutting start part 24 in the width direction W.

[0053] This reduces the distance traveled by the punch 2 in the direction of movement Z for removing the insulating film 52. Therefore, it is possible to provide a design that enables efficient removal of the insulating film 52 and can also suppress a decrease in the removal accuracy of the insulating film 52. (Film removal method using a film removal device)

[0054] Next, with reference to Fig. 8 and Fig. Figures 10A to 13 describe a film removal method according to an exemplary embodiment of the present invention. The film removal method is a method for removing the insulating film 52 from a side surface of the conductor wire 50 using the film removal device 1 with the configuration described above. Fig. 10A to 10C is the part of the conductor wire 50 from which the insulating film 52 is removed, shown shaded for explanation.

[0055] The film removal procedure includes a positioning step S1 and an insulating film removal step S2.

[0056] Positioning step S1 is a step for positioning the conductor wire 50 on the die 3. In the present embodiment, the positioning part 31 of the die 3 positions the conductor wire 50 at a point where the cutting edge part 22 in the cutting body 21 of the punch 2 overlaps the conductor 51 of the conductor wire 50 when the punch 2 is viewed in the direction of movement Z.

[0057] The insulating film removal step S2 is a step for removing the insulating film 52 on the side surface of the conductor wire 50. Specifically, in the insulating film removal step S2, the insulating film 52 contained in the area R of the insulating film 52 on the side surface of the conductor wire 50 is removed by the cutting edge part 22 by moving the punch 2 towards the die 3.

[0058] Specifically, the insulating film removal step S2 includes a first cutting start step S21, a second cutting start step S22, a first insulating film removal step S23 and a second insulating film removal step S24.

[0059] In the present embodiment, as in Fig. As shown in Figure 8, one end W1 of the first cutting start part 23 and the other end W2 of the second cutting start part 24 protrude furthest towards the die 3 from the cutting edge tip of the cutting edge part 22. Consequently, as shown in Fig. As shown in Figure 10A, when the punch 2 is moved forward in the direction of movement Z, the cutting edge tip 23a of the first cutting start part 23 and the cutting edge tip 24a of the second cutting start part 24 are the first to come into contact with the conductor wire 50. Therefore, cuts are formed at the boundaries R1, R2 of the area R from which the insulating film 52 in the conductor wire 50 is removed.

[0060] That is, the first cutting start part 23 forms a boundary R1 at one end in the longitudinal direction of the side surface of the conductor wire 50 in the region R. This step is the first cutting start step S21. The second cutting start part 24 forms a boundary R2 at the other end in the longitudinal direction of the side surface of the conductor wire 50 in the region R. This step is the second cutting start step S22.

[0061] If the stamp is 2, as in Fig. As shown in Figure 10B, the insulating film 52 is moved further forward in the direction of movement Z. In region R, the cutting edge tip 23a of the first cutting start section 23 and the cutting edge tip 25a of the first cutting edge bevel 25 are removed in the direction of movement Z, from one end W1 to the other end W2. The insulating film 52 in region R is removed in the direction of movement Z by the cutting edge tip 24a of the second cutting start section 24 and the cutting edge tip 26a of the second cutting edge bevel 26, from the other end W2 to one end W1.

[0062] When the stamp 2 is moved further forward in the direction of movement Z, the insulating film 52 is removed in area R, as shown in Fig. 10C shown. This forms the exposed part 62, in which the conductor 51 is exposed in the conductor wire 50, and the step part 63 located between the coating part 61 and the exposed part 62.

[0063] That is, the first cutting edge chamfer 25 removes a portion of the insulating film 52 that is closer to the boundary R2 at one end than to the boundary R1 at one end within region R. This step is the first insulating film removal step S23. The second cutting edge chamfer 26 removes a portion of the insulating film 52 that is closer to the boundary R1 at one end than to the boundary R2 at the other end within region R. This step is the second insulating film removal step S24.

[0064] In the present embodiment, the cutting edge part 22 cuts incisions into the boundaries R1, R2 of the area R and simultaneously removes several parts of the insulating film 52 in the area R. This allows the cutting edge part 22 to efficiently remove the insulating film 52.

[0065] As described above, in the present embodiment, the cutting body 21, when viewed in the direction of movement Z, has an inclined surface 21b at the connecting part between a surface 21a in the thickness direction and the two end surfaces on either side in the width direction W. As in Fig. 11, Fig. 12 to Fig. As shown in Figure 13, the stepped portion 63 of the conductor wire 50, from which the insulating film 52 is removed in region R, is inclined to the direction of extension of the conductor wire 50 when viewed in the direction of movement Z of the punch 2. In the present embodiment, the stepped portion 63 is formed by the first and second cutting start portions 23, 24 of the cutting edge portion 22.

[0066] That is, in the present embodiment, the boundary section between the step section 63 and the coating section 61, when viewed in the thickness direction from the cutting body 21, is formed by the cutting edge tip 23a of the first cutting start section 23 and the cutting edge tip 24a of the second cutting start section 24, which are inclined to the width direction W. Therefore, the flat step section 63 can be formed in the direction of movement of the cutting body 21. Consequently, it is possible to form the conductor wire 50 in which the boundary section 61a between the step section 63 and the coating section 61 extends in a straight line in a direction orthogonal to the direction of extension of the conductor wire 50.

[0067] As described above, the exemplary film removal method is a film removal method for removing the insulating film 52 from the side surface of the conductor wire 50 using the film removal device 1. The film removal method comprises a positioning step S1 and an insulating film removal step S2. In positioning step S1, the conductor wire 50 is positioned by the positioning part 31 of the die 3 at a point where the cutting edge part 22 in the cutting body 21 of the punch 2 overlaps the conductor 51 of the conductor wire 50 when the punch 2 is viewed in the direction of movement Z. In insulating film removal step S2, the insulating film 52 in region R of the insulating film 52 on the side surface of the conductor wire 50 is removed by the cutting edge part 22 as the punch 2 is moved in the direction of the die 3.

[0068] The insulating film removal step S2 comprises the first cutting start step S21, the second cutting start step S22, the first insulating film removal step S23, and the second insulating film removal step S24. The first cutting start step S21 forms the boundary R1 at one end in the longitudinal direction of the side surface of the conductor wire 50 in region R through the first cutting start portion 23 of the cutting edge portion 22. The second cutting start step S22 forms the boundary R2 at the other end in the longitudinal direction of the side surface of the conductor wire 50 in region R through the second cutting start portion 24 of the cutting edge portion 22. The first insulating film removal step S23 removes a portion of the insulating film 52 in region R that is closer to the boundary R2 at the other end than to the boundary R1 at one end, through the first cutting edge chamfer 25 of the cutting edge portion 22.The second insulating film removal step S24 removes a portion of the insulating film 52 in the area R, which is closer to the boundary R1 at one end than to the boundary R2 at the other end, by the second cutting edge chamfer 26 of the cutting edge part 22.

[0069] This makes it possible to remove the insulating film 52 covering the side surface of the conductor wire 50, specifically the section R to be removed, from the boundary R1 at one end along the longitudinal direction of the section R to the boundary R2 at the other end, and from the boundary R2 at the other end to the boundary R1 at one end. Therefore, it is possible to provide a film removal method that can efficiently remove the insulating film 52 and also suppress any decrease in the removal accuracy of the insulating film 52. (Modified example of embodiment 1)

[0070] The shape of the cutting edge part 22 of embodiment 1 is an example. The cutting edge part can assume other shapes, as long as it has the first cutting start part, the second cutting start part, the first cutting edge chamfer and the second cutting edge chamfer, wherein the cutting edge tips, when viewed in the thickness direction of the cutting body, are each inclined to the width direction of the cutting body.

[0071] As in Fig. As shown in Figure 14, the cutting body 121 can, for example, have the cutting edge part 122 with the first cutting start part 23, the first cutting edge chamfer 25, the second cutting edge chamfer 26 and the second cutting start part 24, which are arranged in this order from one end W1 to the other end W2 of the width direction W in the cutting body 121.

[0072] As in Fig. 15 and Fig. As shown in Figure 16, the cutting edge parts 222, 322 of the cutting bodies 221, 321 may not be symmetrical when viewed in the thickness direction of the cutting bodies 221, 321. For example, as shown in Fig. As shown in Figure 15, the first cutting start part 23 of the cutting edge part 222 of the cutting body 221 projects further forward in the direction of movement Z than the second cutting start part 24. For example, as shown in Fig. Figure 16 shows that the cutting edge part 321 of the cutting body 322 has several first cutting edge chamfers 25, the lengths of which differ from each other in the width direction W.

[0073] With reference to Fig. 17, Fig. 18 to Fig. Section 19 describes a motor 70. In the following explanation, the direction parallel to the central axis P of the stator 71 is referred to as the axial direction, the direction orthogonal to the central axis P as the radial direction, and the direction along a circular arc centered on the central axis P as the circumferential direction. However, it is not intended to restrict the orientation of the motor 70 when using this definition of direction.

[0074] As in Fig. As shown in Figure 17, the motor 70 has a stator 71 and a rotor 72. The rotor 72 rotates about the central axis P of the stator 71. In this example, the motor 70 is a so-called internal rotor motor, in which the rotor 72 is arranged inside the cylindrical stator 71 and is rotatable about the central axis P. The rotor 72 has the same design as a general rotor, so a further explanation of the rotor 72 is omitted. Fig. Figure 17 shows the stator coil 74 in simplified form.

[0075] As in Fig. As shown in Figure 18, the stator 71 has a stator core 73 and a stator coil 74. Fig. Figure 18 is a perspective view that schematically shows an example of the positional relationship between the stator core 73 and the stator coil 74. Fig. Figure 18 is shown for illustrative purposes only as a part of the several stator coils 74 that are positioned in slot 73b.

[0076] The stator core 73 is cylindrical and extends axially around the central axis P. As in Fig. As shown in Figure 18, the stator core 73 has several teeth 73a arranged circumferentially around its inner circumference. The stator core 73 has slots 73b between the circumferentially adjacent teeth 73a. The multiple slots 73b penetrate the stator core 73 axially. Stator coils 74 are positioned in the slots 73b. The stator coil 74 is wound in a distributed winding around the teeth 73a.

[0077] As in Fig. 18 and Fig. As shown in Figure 19, the stator coil 74, wound around the teeth 73a, is partially enclosed within the slot 73b and partially protrudes from the axial end face of the stator core 73. The stator coil 74 consists of several conductor wires 50.

[0078] As in Fig.As shown in Figure 19, the wire ends 50a of the several conductor wires 50 protrude from the axial end face of the stator core 73. In the case of the several conductor wires 50, the wire ends 50a that protrude from the axial end face of the stator core 73 are electrically connected to each other.

[0079] The design of the conductor wire 50 is the same as in embodiment 1. That is, the conductor wire 50 has the coated part 61, the side surface of which is covered with the insulating film 52, and the exposed part 62, the side surface of which is exposed without being covered by the insulating film 52. The conductor wire 50 has the stepped part 63, which is positioned between the coated part 61 and the exposed part 62. The boundary part 61a between the stepped part 63 and the coated part 61 extends in a straight line in a direction orthogonal to the direction of extension of the conductor wire 50.

[0080] The conductor wire 50, in which the boundary section 61a between the step section 63 and the coating section 61 extends in a straight line in a direction orthogonal to the direction of extension of the conductor wire 50, is formed by a cutting edge with a starting cutting angle greater than 0 degrees. That is, the exposed part 62 and the step section 63 of the conductor wire 50 are formed by the film removal device 1. The wire end 50a of the conductor wire 50 is obtained by cutting the exposed part 62 of the conductor wire 50, which is formed by the film removal device 1, at the central part in the direction of extension of the conductor wire 50.

[0081] That is, the exemplary motor 70 is a motor with the stator 71 and the rotor 72. The stator 71 has the stator core 73 with the multiple slots 73b extending in the axial direction, the conductor 51, the insulating film 52 covering the conductor 51, and the multiple conductor wires 50, which are partially contained in the multiple slots 73b. The rotor 72 rotates about the axis of the stator 71. The conductor wires 50 have the coated part 61, in which the conductor 51 is covered by the insulating film 52, the exposed part 62, in which the conductor 51 is exposed, and the stepped part 63, which lies between the coated part 61 and the exposed part 62. The boundary section between the step section 63 and the coating section 61 extends in a straight line in a direction orthogonal to the direction of extension of the conductor wire 50.

[0082] In the motor 70 described above, the staged portion 63 of the conductor wire 50, whose boundary section 61a is in a straight line with the coating section 61, is formed by a cutting edge whose initial cutting angle is greater than 0 degrees. That is, the insulating film 52 of the conductor wire 50 is removed by the cutting element 21 with a suppressed decrease in distance accuracy. Thus, the decrease in the distance accuracy of the insulating film 52 is suppressed in the stator 71. Consequently, the stator 71 can be obtained from which the insulating film 52 is removed efficiently and with high accuracy. (Other embodiments)

[0083] The aforementioned embodiments are merely examples of how the present invention can be implemented. Without being limited to the aforementioned embodiments, it is therefore possible to implement them with suitable modifications, provided they do not deviate from the intended meaning.

[0084] In the aforementioned embodiment 1, the cutting body 21, when viewed in the direction of movement Z, has the inclined surface 21b on the connecting part between the surface 21a in the thickness direction and the end surfaces on both side faces in the width direction W. However, when viewed in the direction of movement, the cutting body need not have an inclined surface on the connecting part between the surface in the thickness direction and the end surfaces on both side faces in the width direction W.

[0085] In the aforementioned embodiment 1, the punch 2 has a pair of cutting elements 21. However, the punch can also have only one cutting element.

[0086] In the aforementioned embodiment 1, the die 3 has a rectangular shape, which is long in the cutting direction corresponding to the alignment direction of the pair of cutting elements 21 when viewed in the direction of movement Z of the punch 2. However, the die can also have a rectangular shape that is long in the direction of the alignment of the pair of cutting elements when viewed in the direction of movement. The die can have the same length in the alignment direction and in the direction that intersects the alignment direction when viewed in the direction of movement. The die need not be rectangular when viewed in the direction of movement.

[0087] In the embodiment 1 mentioned above, the positioning element 31 is the groove element 31a for positioning the conductor wire 50. However, the positioning element can have any other configuration, as long as it can position the conductor at a predetermined position on the base. For example, the positioning element can be a projection that extends from the base of the die and restricts the movement of the conductor relative to the die. The positioning element can also be a fixing element that secures the conductor in a predetermined position on the base of the die.

[0088] In the embodiment 1 above, the angle of inclination D23 of the cutting edge tip 23a of the first cutting start portion 23 is 20 degrees. The angle of inclination D25 of the cutting edge tip 25a of the first cutting edge chamfer 25 is 45 degrees. However, the angle of inclination D23 of the cutting edge tip of the first cutting start portion can be less than 20 degrees or greater than 20 degrees if it is less than the angle of inclination D25 of the cutting edge tip of the first cutting edge chamfer. The angle of inclination D25 of the cutting edge tip of the first cutting edge chamfer can be less than 45 degrees or greater than 45 degrees if it is greater than the angle of inclination D23 of the cutting edge tip of the first cutting start portion. The angle of inclination D23 of the cutting edge tip of the first cutting start portion is preferably 20 degrees or more. The inclination angle D25 of the cutting edge tip of the first cutting edge chamfer is preferably between 45 and 50 degrees.

[0089] In the embodiment 1 above, the angle of inclination D24 of the cutting edge tip 24a of the second cutting start portion 24 is 20 degrees. The angle of inclination D26 of the cutting edge tip 26a of the second cutting edge chamfer 26 is 45 degrees. However, the angle of inclination D24 of the cutting edge tip of the second cutting start portion can be less than 20 degrees or greater than 20 degrees if it is less than the angle of inclination D26 of the cutting edge tip of the second cutting edge chamfer. The angle of inclination D26 of the cutting edge tip of the second cutting edge chamfer can be less than 45 degrees or greater than 45 degrees as long as it is greater than the angle of inclination D24 of the cutting edge tip of the second cutting edge chamfer. The angle of inclination D24 of the cutting edge tip of the second cutting start portion is preferably 20 degrees or more. The inclination angle D26 of the cutting edge tip of the second cutting edge chamfer is preferably between 45 and 50 degrees.

[0090] The configuration of the motor 70 is an example of a motor configuration in which the conductor wire 50, from which the insulating film 52 has been removed by the film removal device 1, is used. The motor configuration can be any configuration in which the conductor wire 50 formed by the film removal device 1 of embodiment 1 can be used. (Training example)

[0091] The present technique can also be trained as follows. (1) The film removal device is a film removal device that removes the insulating film from the side surface of a conductor wire by means of a punch comprising a cutting element and a die. The punch is movable relative to the die. The cutting element is plate-shaped and has a cutting edge portion at its leading end in the direction of movement of the punch. The cutting edge portion has a first cutting start portion, a second cutting start portion, at least one first cutting edge chamfer, and at least one second cutting edge chamfer, the cutting edge tips being inclined, viewed in the thickness direction, to the width direction of the cutting element. The first cutting start portion and the first cutting edge chamfer are arranged successively along the cutting edge portion from one end to the other in the width direction.The second cutting start section and the second cutting edge chamfer are arranged successively along the cutting edge section, from the opposite end to the first end, in the width direction. When the cutting body is viewed in the thickness direction, the angle of inclination of the cutting edge tip of the first cutting start section to the width direction is smaller than the angle of inclination of the cutting edge tip of the first cutting edge chamfer to the width direction. Similarly, when the cutting body is viewed in the thickness direction, the angle of inclination of the cutting edge tip of the second cutting start section to the width direction is smaller than the angle of inclination of the cutting edge tip of the second cutting edge chamfer to the width direction. (2) In the film removal device according to paragraph (1), the length of the first cutting start part in the width direction is shorter than the length of the first cutting edge bevel in the width direction. The length of the second cutting start part in the width direction is shorter than the length of the second cutting edge bevel in the width direction. (3) In the film removal device according to section (2), the cutting edge tip of the first starting cutting part is inclined to the width direction when the cutting body is viewed in the thickness direction. When the cutting body is viewed in the thickness direction, the cutting edge tip of the first beveled cutting edge is inclined at an angle of 45 degrees or more to the width direction. (4) In the film removal device according to paragraph (2) or (3), the cutting edge tip of the second starting cutting part is inclined to the width direction when the cutting body is viewed in the thickness direction. When the cutting body is viewed in the thickness direction, the cutting edge tip of the second beveled cutting edge is inclined at an angle of 45 degrees or more to the width direction. (5) In the film removal device according to any of sections (1) to (4) the cutting edge part between the first cutting edge bevel adjacent to the first cutting start part in the width direction and the second cutting edge bevel adjacent to the second cutting start part, has another first cutting edge bevel and another second cutting edge bevel arranged successively in the width direction. (6) In the film removal device according to any one of paragraphs (1) to (5), the die has a positioning part for positioning the guide wire. The positioning part positions the guide wire in a position in which the cutting edge part of the punch, when viewed in the direction of movement, overlaps the conductor of the guide wire. (7) The film removal method is a film removal method for removing the insulating film from the side surface of the conductor wire using the film removal device according to any one of sections (1) to (6). The film removal method comprises: a positioning step in which the conductor wire is positioned by a positioning part of the die at a position where, when viewed in the direction of movement of the punch, the cutting edge portion in the cutting body of the punch overlaps the conductor of the conductor wire; and an insulating film removal step in which, by moving the punch towards the die, an insulating film is removed in a predetermined area in the insulating film on the side surface of the conductor wire. The insulating film removal step comprises: a first cutting start step,in which a boundary at one end in the longitudinal direction of the side surface of the conductor wire in the specified area is formed by the first cutting start part of the cutting edge part, a second cutting start step in which a boundary at the other end in the longitudinal direction of the side surface of the conductor wire in the specified area is formed by the second cutting start part of the cutting edge part, a first insulating film removal step in which a portion of the insulating film in the specified area, which is positioned closer to the boundary at the other end than the boundary at one end, is removed by the first cutting edge bevel of the cutting edge part, and a second insulating film removal step in which a portion of the insulating film in the specified area, which is positioned closer to the boundary at one end than the boundary at the other end, is removed by the second cutting edge bevel of the cutting edge part. (8) The motor is a motor comprising: a stator having a stator core with several slots extending in the axial direction, a conductor, an insulating film covering the conductor, and several conductor wires partially enclosed in the several slots, and a rotor rotating about an axis of the stator. The conductor wire has: a coated portion in which the conductor is covered by the insulating film, an exposed portion in which the conductor is exposed, and a stepped portion positioned between the coated portion and the exposed portion. The boundary portion between the stepped portion and the coated portion extends in a straight line in a direction orthogonal to the direction of extension of the conductor wire. INDUSTRIAL APPLICABILITY

[0092] It can be used for the manufacture of stator coils for motors. EXPLANATION OF THE REFERENCE SYMBOLS 1 film removal device 2 stamps 3 die 3a Basis 21, 121, 221, 322 cutting bodies 21a a surface in the thickness direction of the cutting body 21b inclined surface 22, 122, 222, 321 Cutting edge part 23 first section beginning 23a Cutting edge tip 24 second section beginning part 24a Cutting edge tip 25 first cutting edge chamfer 25a Cutting edge tip 26 second cutting edge chamfer 26a Cutting edge tip 31 Positioning part 31a Nut part 32 insertion hole 50 conductor wire 50a wire end 51 leaders 52 insulating film 61 Coating part 61a Border section 62 exposed part 63-step section 70 engine 71 Stator 72 Rotor 73 Stator core 73a teeth 73b slot 74 Stator coil D23 Inclination angle of the cutting edge tip of the first cutting start part to the width direction of the cutting body D24 Inclination angle of the cutting edge tip of the second cutting start part to the width direction of the cutting body D25 Inclination angle of the cutting edge tip of the first cutting edge chamfer to the width direction of the cutting body D26 Inclination angle of the cutting edge tip of the second cutting edge chamfer to the width direction of the cutting body

Claims

[1] Film removal device (1) which removes an insulating film (52) from the side surface of a conductor wire (50) by means of a punch (2) comprising a cutting element (21, 121, 221, 322) and a die (3), wherein the punch (2) is movable against the die (3), the cutting body (21, 121, 221, 322) is plate-shaped and has a cutting edge part (22, 122, 222, 321) at a front end in the direction of movement of the punch (2), the cutting edge part (22, 122, 222, 321) has a first cutting start part (23), a second cutting start part (24), at least one first cutting edge chamfer (25) and at least one second cutting edge chamfer (26), wherein the cutting edge tips (23a, 24a, 25a, 26a) are inclined to the width direction of the cutting body (21, 121, 221, 322) when viewed in the thickness direction, the first cutting start part (23) and the first cutting edge chamfer (25) are arranged one after the other from one end to the other in the width direction on the cutting edge part (22, 122, 222, 321), the second cutting start part (24) and the second cutting edge bevel (26) are arranged one after the other from the other end to the one end in the width direction on the cutting edge part (22, 122, 222, 321), When considering the cutting body (21, 121, 221, 322) in the thickness direction, the inclination angle of the cutting edge tip (23a) of the first cutting start part (23) to the width direction is smaller than the inclination angle of the cutting edge tip (25a) of the first cutting edge chamfer (25) to the width direction, and When considering the cutting body (21, 121, 221, 322) in the thickness direction, the inclination angle of the cutting edge tip (24a) of the second cutting start part (24) to the width direction is smaller than the inclination angle of the cutting edge tip (26a) of the second cutting edge chamfer (26) to the width direction. [2] Film removal device (1) according to claim 1, wherein the length of the first cutting start part (23) in the width direction is shorter than the length of the first cutting edge chamfer (25) in the width direction, and the length of the second cutting start part (24) in the width direction is shorter than the length of the second cutting edge chamfer (26) in the width direction. [3] Film removal device (1) according to claim 2, wherein When considering the cutting body (21, 121, 221, 322) in the thickness direction, the cutting edge tip (23a) of the first cutting start part (23) is inclined to the width direction, and when considering the cutting body (21, 121, 221, 322) in the thickness direction, the cutting edge tip (25a) of the first cutting edge bevel (25) is inclined at an angle of 45 degrees or more to the width direction. [4] Film removal device (1) according to claim 2, wherein When considering the cutting body (21, 121, 221, 322) in the thickness direction, the cutting edge tip (24a) of the second cutting start part (24) is inclined to the width direction, and When considering the cutting body (21, 121, 221, 322) in the thickness direction, the cutting edge tip (26a) of the second cutting edge chamfer (26) is inclined at an angle of 45 degrees or more to the width direction. [5] Film removal device (1) according to claim 1, wherein the cutting edge part (22, 122, 222, 321) has another first cutting edge bevel (25) adjacent to the first cutting start part (23) in the width direction and another second cutting edge bevel (26) adjacent to the second cutting start part (24), which are arranged successively in the width direction. [6] Film removal device (1) according to claim 1, wherein the die (3) has a positioning part (31) for positioning the conductor wire (50), wherein the positioning part (31) positions the conductor wire (50) in a position in which the cutting edge part (22, 122, 222, 321) of the punch (2) overlaps the conductor (51) of the conductor wire (50) when viewed in the direction of movement of the punch (2). [7] Film removal method for removing an insulating film (52) from the side surface of a conductor wire (50) using the film removal device (1) according to any one of claims 1 to 6, comprising: a positioning step in which the conductor wire (50) is positioned by a positioning part (31) of the die (3) at a position where the cutting edge part (22, 122, 222, 321) in the cutting body (21, 121, 221, 322) of the punch (2) overlaps the conductor (51) of the conductor wire (52) when viewed in the direction of movement of the punch (2), and an insulating film removal step in which, by moving the punch (2) towards the die (3), the insulating film (52) is removed in a predetermined area in the insulating film (52) on the side surface of the conductor wire (50), where the insulating film removal step includes: a first cutting start step in which a boundary at one end in the longitudinal direction of the side surface of the conductor wire (50) in the specified area is formed by the first cutting start part (23) of the cutting edge part (22, 122, 222, 321), a second cutting start step in which a boundary at the other end in the longitudinal direction of the side surface of the conductor wire (50) is formed in the specified area by the second cutting start part (24) of the cutting edge part (22, 122, 222, 321), a first insulating film removal step in which a part of the insulating film (52) in the specified area, which is positioned closer to the boundary at the other end than the boundary at one end, is removed by the first cutting edge chamfer (25) of the cutting edge part (22, 122, 222, 321), and a second insulating film removal step in which a part of the insulating film (52) in the specified area, which is positioned closer to the boundary at one end than the boundary at the other end, is removed by the second cutting edge chamfer (26) of the cutting edge part (22, 122, 222, 321).

Images