Processing device and method for forming recess

Abstract

To provide a technique for a processing device that prevents the bottom of an original recess from being closed.SOLUTION: A recess has, at least in part in the depth direction, a portion where the shape in a cross-section perpendicular to the depth direction is a constant polygonal shape. A processing device includes a pressing portion that is pushed into a pre-formed original recess while expanding the original recess. The pressing portion has a shape such that, when projected in the pressing direction, the outer shape of the tip in the pressing direction is contained within the outer shape of the rear end, and the side surface tapers from the tip toward the rear end. The outer shape of the cross-section perpendicular to the pressing direction at the rear end of the pressing portion is polygonal, and the pressing portion has such a shape that the radius of curvature at the corners of the polygonal shape in the cross-section perpendicular to the pressing direction increases from the rear end toward the tip.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a processing apparatus and a method for forming a recessed portion.

Background Art

[0002] In Patent Document 1, a coil disposed on teeth of a stator is disclosed, which is formed by joining end portions of two coil segments each formed in a substantially U shape. In each of the two coil segments, the periphery of a conductor is covered with an insulating material. The two coil segments are joined by fitting a protrusion of the conductor formed on an end face of one lead wire into a hole formed in an end face of the other conductor. The hole in the end face of the other conductor is formed by cutting.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The inventors have devised a method of forming a second hole for fitting the tip of a coil segment after previously forming a first hole in an end face of a conductor. The first hole is a hole whose dimension in an arbitrary direction perpendicular to the direction in which the conductor extends is smaller than the dimension of the hole to be formed. The second hole is formed by pushing a tool whose dimension in an arbitrary direction perpendicular to the pressing direction against the conductor is larger than that of the first hole. The first hole is formed by cutting. In forming the first hole and the second hole, the conductor is fitted into a mold.

[0005] Depending on the shape of the tip of the coil segment fitted into the conductor, in some cases, the shape of the second hole is required to be polygonal when viewed along the direction in which the conductor extends. In that case, the shape of the tool for forming the second hole needs to be polygonal when viewed in the pressing direction. In the cutting process for forming the first hole, by forming the hole in one operation with a drill, the productivity of forming the first hole is increased. In one operation with a drill, when viewed along the direction in which the conductor extends, the shape of the first hole is substantially circular. Compared with the case where the shape of the second hole when viewed in the pressing direction is required to be circular, when projected along the direction in which the conductor extends, the overlapping region between the portion of the conductor around the first hole and the tool is large. As a result, a large amount of the conductor in the overlapping region is pushed toward the bottom of the first hole by the pushing of the tool. As a result, the pushed conductor may block the first hole. When the first hole is blocked, the dimension of the second hole in the direction in which the conductor extends becomes smaller than the desired dimension.

Means for Solving the Problems

[0006] The present disclosure can be realized in the following forms.

[0007] (1) According to one aspect of the present disclosure, a processing apparatus for forming a recess in an end face of a linear member is provided. In this processing apparatus, the recess has a portion where the shape in a cross section perpendicular to the depth direction is a regular polygon at least in a part of the depth direction. The processing apparatus includes a pushing portion that is pushed into the original recess while expanding the original recess formed in advance along the direction in which the linear member extends on the end face of the linear member. When projected in the pushing direction, the outer shape of the tip of the pushing portion in the pushing direction is a shape included in the outer shape of the rear end, and has a tapered side surface from the tip toward the rear end. The outer shape of the cross section perpendicular to the pushing direction at the rear end of the pushing portion is the regular polygon. The pushing portion has a shape in which the radius of curvature of the corner portion of the regular polygon in the cross section perpendicular to the pushing direction increases from the rear end toward the tip. In an embodiment where all the radii of curvature of the corners of the pressing portion are the same, when projected in the direction in which the linear member extends, there may be a large overlapping region between the portion of the linear member around the original recess and the tip of the pressing portion. When a force is applied to the pressing portion in the pressing direction, the portion of the linear member that overlaps with the pressing portion may be pushed into the bottom of the original recess. According to the processing apparatus of this form, the radius of curvature at the corner of the rear end is larger than the radius of curvature at the corner of the tip. Compared with the embodiment where all the radii of curvature of the corners of the pressing portion are the same, the linear member in contact with the tip moves more in a direction perpendicular to the pressing direction rather than in the pressing direction. As the pressing portion is pushed in the pressing direction from the tip to the rear end, the amount of the linear member that can move in the direction perpendicular to the pressing direction decreases. The linear member that has moved in the direction perpendicular to the pressing direction then moves in the direction opposite to the pressing direction. As a result, the linear member extends in the direction opposite to the pressing direction. Since the linear member is not pushed in the pressing direction, it is possible to suppress the bottom of the original recess from being blocked. (2) In the processing apparatus of the above form, further, a forming portion that is connected to the rear end of the pressing portion and that presses against the original recess is provided. The forming portion has the polygonal shape in a cross section perpendicular to the pressing direction, and a dimension in the pressing direction is a first dimension that is a predetermined dimension. A value obtained by adding the first dimension to the dimension from the tip to the rear end in the pressing direction may be equal to or greater than the dimension of the original recess in the pressing direction. According to the processing apparatus of this form, compared with an embodiment without the forming portion, the linear member moved in a direction perpendicular to the pressing direction by the pressing portion is more likely to move in the direction opposite to the pressing direction while contacting the forming portion thereafter. For example, when it is desired to form a hole having a dimension larger than the dimension from the tip to the rear end in the pressing direction, since the linear member moved in the direction opposite to the pressing direction by the pressing portion is suppressed from moving toward the original recess thereafter, it becomes easy to form the recess. (3) In the processing apparatus of the above-described embodiment, the dimension of the rear end in a direction perpendicular to the pushing-in direction may be smaller than 90% of the dimension of the linear member in a direction perpendicular to the pushing-in direction. According to the processing apparatus of this embodiment, for example, compared with an aspect in which the dimension of the rear end is 90% or more of the dimension in a direction perpendicular to the pushing-in direction of the linear member, more linear members remain in a direction perpendicular to the pushing-in direction of the linear member. It is possible to more effectively suppress the linear member from being pulled in the direction in which it is pushed by the pushing portion. (4) In the processing apparatus of the above-described embodiment, the shape of the linear member in a cross-section perpendicular to the pushing-in direction is rectangular, and the concave portion may have a long side parallel to the long side of the outer shape of the linear member and a short side parallel to the short side of the outer shape of the linear member. According to the processing apparatus of this embodiment, another linear member can be easily inserted into the concave portion of the linear member having a rectangular cross-sectional shape. (5) According to another aspect of the present disclosure, there is provided a concave portion forming method for forming a concave portion on an end surface of a linear member. In this concave portion forming method, the concave portion has a portion in which the shape in a cross-section perpendicular to the depth direction is a regular polygon with a constant shape in at least a part of the depth direction, and a step of forming an original concave portion along the direction in which the linear member extends on the end surface of the linear member, and a step of pushing a pushing portion into the original concave portion. The pushing portion has a shape in which when projected in the pushing-in direction, the outer shape of the tip in the pushing-in direction is included in the outer shape of the rear end, and has a tapered side surface from the tip toward the rear end. The outer shape of the cross-section perpendicular to the pushing-in direction at the rear end of the pushing portion is the regular polygon, and the pushing portion has a shape in which the radius of curvature of the corner portion of the regular polygon in the cross-section perpendicular to the pushing-in direction increases from the rear end toward the tip. The present disclosure can also be implemented in various forms other than the processing apparatus and the concave portion forming method. For example, it can be implemented in the form of a manufacturing method of the processing apparatus, a control method of the processing apparatus, a computer program for implementing the control method and the concave portion forming method, a non-transitory recording medium on which the computer program is recorded, and the like.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0009] A. This Embodiment: A1. Configuration of this Embodiment: FIG. 1 is a diagram showing a formed concave portion MR formed in a linear member LM. In FIG. 1, a cross-sectional view of the linear member LM with respect to a cross-section C1 parallel to the ZX plane is shown on the lower side, and a plan view of the linear member LM viewed along the negative direction of the Z axis is shown on the upper side. The same applies to FIG. 2 described later. The linear member LM shown on the lower side of FIG. 1 includes an end face LME of the linear member LM and extends along the Z-axis direction. For convenience of understanding, hatching is also applied to the view of the linear member LM viewed along the negative direction of the Z axis.

[0010] In this embodiment, the linear member LM is a coil segment. The cross-section of the linear member LM in the plane including the X-axis and the Y-axis is rectangular. Note that in this specification, a rectangle includes those with corners having curvature. The linear member LM extends in the Z direction. The linear member LM has a conductor CD and an insulating material IM. The conductor CD conducts current to electronic components (not shown). The conductor CD is exposed at the end face LME. The outside of the conductor CD is covered by the insulating material IM. The conductor CD has a formed recess MR.

[0011] The formed recess MR is a recess formed by the processing apparatus 1 of this embodiment. The formed recess MR is formed in the end face LME of the linear member LM. The Z direction is the depth direction of the formed recess MR. The formed recess MR has a portion in the Z direction where the shape in a cross-section perpendicular to the Z direction is a regular polygon. In this embodiment, the regular polygon is a rectangle. As shown in FIG. 1, in the end face LME of the linear member LM, the shape of the formed recess MR in the cross-section including the X-axis and the Y-axis, which is the direction perpendicular to the Z direction, is a rectangle. Also, the shape of the formed recess MR of the linear member LM on the lower side in FIG. 1 in the cross-section including the X-axis and the Y-axis is a rectangle. The long side of the formed recess MR is parallel to the long side of the outer shape of the linear member LM. In this embodiment, the long side of the formed recess MR and the long side of the outer shape of the linear member LM are parallel to the X-axis. Also, the short side of the formed recess MR is parallel to the short side of the outer shape of the linear member LM. In this embodiment, the short side of the formed recess MR and the short side of the outer shape of the linear member LM are parallel to the Y-axis. The method for forming the formed recess MR will be described later.

[0012] The insulating material IM protects the conductor CD by covering the periphery of the conductor CD. Also, the insulating material IM insulates the conductor CD from the outside. The insulating material IM is exposed at the end face LME.

[0013] FIG. 2 is a diagram for explaining the original recess OD. In FIG. 2, for ease of understanding, a dashed line representing the outer shape of the formed recess MR is illustrated. FIG. 2 corresponds to FIG. 1. The original recess OD is a recess formed in advance in the end face LME of the linear member LM before the formed recess MR is formed. When the processing device 1 described later is pushed into the original recess OD, the original recess OD expands. As a result, the formed recess MR is formed. The original recess OD is formed along the Z direction, which is the direction in which the linear member LM extends, in the end face LME of the linear member LM. The original recess OD has a substantially circular shape when viewed in the Z direction. The method of forming the original recess OD will be described later.

[0014] FIG. 3 is a diagram for explaining a part of the processing device 1 of the present embodiment. FIG. 4 is a diagram of the processing device 1 in FIG. 3 viewed from another angle. In FIG. 4, the curve of the corner of the rear end 120 is exaggerated with respect to FIG. 3. The processing device 1 forms a formed recess MR in the end face LME of the linear member LM. The processing device 1 includes a pushing portion 10 and a forming portion 20. The pushing portion 10 is pushed into the original recess OD while expanding the original recess OD. As shown in FIG. 3, the pushing portion 10 includes a tip 110 and a rear end 120. Although not shown in FIG. 3, the pushing portion 10 is pushed into the original recess OD so that the direction in which the pushing portion 10 extends coincides with the Z direction, which is the direction in which the linear member LM extends. More specifically, the pushing portion 10 is pushed into the original recess OD in the -Z direction. Hereinafter, the -Z direction will also be referred to as the "pushing direction". In FIGS. 3 and 4, the direction when the pushing portion 10 is pushed into the original recess OD is indicated.

[0015] FIG. 5 is a view showing a cross section of the tip 110. The tip 110 is a portion that is pushed into the original recess OD ahead of the rear end 120. The outer shape of the cross section of the tip 110 perpendicular to the pushing direction has a polygonal shape. In the present embodiment, as shown in FIG. 5, the outer shape of the cross section of the tip 110 including the X-axis and the Y-axis, which is perpendicular to the -Z direction, which is the pushing direction of the tip 110, is a rectangle. The radius of curvature of the corner 111 of the tip 110 is configured to be smaller than the radius of curvature of the original recess OD. The radius of curvature is represented by connecting the portions corresponding to the corners of the polygon with a curve and obtaining the curvature of the curve. In the present embodiment, the values of the radii of curvature of the four corners 111 of the tip 110 in the cross section including the X-axis and the Y-axis are all configured to be the same. That the values of the radii of curvature of the corners 111 of the tip 110 are the same means that the smallest value among the values of the radii of curvature of the corners in the cross section including the X-axis and the Y-axis is within the range of ±10% of the largest value. The same applies to the rear end 120. In the present embodiment, the dimensions of the tip 110 in the X-axis direction and the Y-axis direction are configured to be larger than the dimensions of the original recess OD in the X-axis and the Y-axis directions.

[0016] FIG. 6 is a diagram showing a cross section of the rear end 120. The rear end 120 is a portion that is pushed in after the front end 110 with respect to the original concave portion OD. The outer shape of the cross section of the rear end 120 perpendicular to the pushing-in direction has a polygonal shape. In the present embodiment, as shown in FIG. 6, the outer shape of the cross section including the X-axis and the Y-axis, which is the direction perpendicular to the -Z direction (the pushing-in direction) of the rear end 120, is a rectangle. Note that, as shown in FIGS. 5 and 6, the rectangle that is the outer shape of the rear end 120 has a different shape from the rectangle that is the outer shape of the front end 110. Specifically, the rear end 120 has a smaller radius of curvature of the corner portion 121 than the radius of curvature of the corner portion 111 of the front end 110. In the present embodiment, the values of the radii of curvature of the four corner portions 121 of the rear end 120 in the cross section including the X-axis and the Y-axis are all configured to be the same. The rear end 120 has a dimension in the X-axis direction that is larger than the dimension of the front end 110 in the X-axis direction. Also, the rear end 120 has a dimension in the Y-axis direction that is larger than the dimension of the front end 110 in the Y-axis direction. The pushing-in portion 10 has a shape in which the rear end 120 has a frustum of a square pyramid shape and approaches a frustum of a cone as it goes from the rear end 120 to the front end 110. The value of the radius of curvature of the corner portion 111 of the front end 110 is closer to the value of the radius of curvature of the original concave portion OD than the radius of curvature of the corner portion 121 of the rear end 120.

[0017] In the present embodiment, the dimension of the rear end 120 in the direction perpendicular to the pushing-in direction is smaller than 90% of the dimension of the linear member LM in the direction perpendicular to the pushing-in direction. Specifically, the dimension of the rear end 120 in a certain direction perpendicular to the pushing-in direction is smaller than 90% of the dimension of the linear member LM in that direction. In the present embodiment, the dimension DH1 of the rear end 120 of the pushing-in portion 10 in the X-axis direction is configured to be smaller than 90% of the dimension DHX of the linear member LM in the X-axis direction (see FIGS. 1 and 4). Also, the dimension DH2 of the rear end 120 of the pushing-in portion 10 in the Y-axis direction is configured to be smaller than 90% of the dimension DHY of the linear member LM in the Y-axis direction (see FIGS. 1 and 4).

[0018] As shown in Fig. 3, the pushing-in portion 10 has a shape with a tapered side surface from the front end 110 toward the rear end 120. Specifically, the pushing-in portion 10 has a tapered side surface that is thicker from the front end 110 toward the rear end 120. The pushing-in portion 10 increases in dimensions in the X-axis and Y-axis directions from the front end 110 toward the rear end 120. The pushing-in portion 10 has a shape in which the radius of curvature of the rectangular corner in the cross-section including the X-axis and Y-axis, which is a direction perpendicular to the -Z direction (the direction in which it is pushed in), increases as it goes from the rear end 120 toward the front end 110. In the present embodiment, the radius of curvature of the corner 121 at the rear end 120 is the same as the radius of curvature of the corner at the end face LME of the forming recess MR. As shown in Fig. 3, the dimension of the pushing-in portion 10 from the front end 110 to the rear end 120 is DH3.

[0019] The forming portion 20 shown in Fig. 3 is the portion that is pushed into the original recess OD after the rear end 120. The forming portion 20 is connected to the rear end 120 of the pushing-in portion 10. The forming portion 20 has the same shape in the cross-section including the X-axis and Y-axis, which is a direction perpendicular to the -Z direction (the direction in which it is pushed in), as the polygonal shape of the rear end 120. In the present embodiment, the shape in the cross-section including the X-axis and Y-axis of the forming portion 20 is rectangular. The forming portion is configured such that the radius of curvature of the corner in the pushing-in direction is constant. The forming portion 20 has the same radius of curvature of the rectangular corner 210 as the radius of curvature of the corner 121 at the rear end 120 of the pushing-in portion 10. That the radius of curvature of the corner 210 of the forming portion 20 is the same as the radius of curvature of the corner 121 at the rear end 120 means that the value of the radius of curvature of the corner 210 of the forming portion 20 is within the range of ±10% of the radius of curvature of the corner 121 at the rear end 120. The forming portion 20 has a dimension in the -Z direction (the direction in which it is pushed in) that is a first dimension DH4, which is a predetermined dimension. In the present embodiment, the value obtained by adding the dimension DH3 from the front end 110 to the rear end 120 to the first dimension DH4 is larger than the dimension DHL of the original recess OD in the pushing-in direction (see Figs. 2 and 3).

[0020] A2. Method for forming a recess: FIG. 7 is a flowchart showing an example of a method for forming the forming recess MR. FIG. 8 is a diagram for explaining the process of forming the forming recess MR. The process proceeds along the rightward white arrow. Before the process of step S10 in FIG. 7, the linear member LM is fitted into a mold (not shown). Thereby, the expansion of the linear member LM in the X-axis and Y-axis directions during the formation of the original recess OD and the forming recess MR is suppressed. In FIG. 8, it seems that all of the linear member LM is exposed to the outside, but in the actual process, only the end face LME of the linear member LM is exposed to the outside.

[0021] In step S10 of FIG. 7, at the end face LME of the conductor CD of the linear member LM, the original recess OD is formed by a cutting tool (see step S10 in FIG. 8). The original recess OD extends along the Z direction, which is the direction in which the conductor CD extends from the surface of the end face LME. In step S10, the original recess OD is formed such that the radius of curvature of the original recess OD is larger than the radius of curvature of the tip 110 of the pushing portion 10.

[0022] In step S20 of FIG. 7, the tip 110 of the pushing portion 10 is pushed into the original recess OD (see step S20 in FIG. 8). At this time, among the pushing portion 10, the pushing portion 10 is pushed into the original recess OD with the tip 110 facing the original recess OD.

[0023] FIG. 9 is a diagram showing a projection of the pushing portion 10. As shown in FIG. 9, when the pushing portion 10 is projected in the -Z direction, which is the direction in which it is pushed, the outer shape of the tip 110 in the pushing direction includes the original recess OD. That is, in the X-axis and Y-axis directions, there is the conductor CD between the tip 110 of the pushing portion 10 and the outer periphery of the original recess OD. Also, when projected in the -Z direction, the outer shape of the tip 110 in the pushing direction is included in the outer shape of the rear end 120.

[0024] As described above, the radius of curvature of the corner 111 of the tip 110 of the pushing portion 10 is larger than the radius of curvature of the corner 121 of the rear end 120. For example, in the aspect where the radius of curvature of all the corners of the pushing portion 10 is the same, when projected in the direction in which the linear member LM extends, there may be a large overlapping region between the portion around the original recess OD of the linear member LM and the tip 110 of the pushing portion 10. Here, from the viewpoint of productivity, it is preferable that the original recess OD is formed by a single drilling process. When the original recess OD is formed by a single drilling process, the shape in the cross-section including the X-axis and Y-axis of the original recess OD is substantially circular. Therefore, in order to form the molded recess MR whose cross-sectional shape is polygonal, the cross-sectional shape of the rear end 120 needs to be polygonal. In the aspect where the radius of curvature of the corners from the tip 110 to the rear end 120 of the pushing portion 10 is the radius of curvature of the corner 121 of the rear end 120, when projected in the direction in which the linear member LM extends, the overlapping region between the portion around the original recess OD of the linear member LM and the tip 110 of the pushing portion 10 becomes larger compared with this embodiment. In this case, when a force is applied to the pushing portion 10 in the pushing direction, the portion of the linear member LM that overlaps with the pushing portion 10 may be pushed into the bottom of the original recess OD.

[0025] In this embodiment, compared with the aspect where the radius of curvature of all the corners of the pushing portion 10 is the same, immediately after the tip 110 is pushed into the end face LME of the linear member LM, the conductor of the linear member LM that contacts the tip 110 moves more in the X-axis or Y-axis direction, which is perpendicular to the pushing direction, rather than in the -Z direction, which is the pushing direction (see arrow B in FIG. 9). The movement of the conductor CD in the -Z direction immediately after the tip 110 is pushed is smaller compared with the aspect where the radius of curvature of the corners from the tip 110 to the rear end 120 of the pushing portion 10 is the same.

[0026] In step S30 of FIG. 7, the pushing portion 10 is pushed into the original concave portion OD from the front end 110 toward the rear end 120. As described above, the pushing portion 10 is thickened from the front end 110 toward the rear end 120. Further, the pushing portion 10 has a larger radius of curvature of the corner as it goes from the rear end 120 toward the front end 110. And as it goes toward the rear end 120, the radius of curvature of the corner approaches the radius of curvature of the forming concave portion MR.

[0027] As the pushing portion 10 is pushed in the direction in which it is pushed in (from the front end 110 toward the rear end 120), the amount of the linear member LM that can move in the direction perpendicular to the pushing direction decreases. In the present embodiment, the amount of the linear member LM that can move in the X-axis direction and the Y-axis direction, which are the -Z direction (the pushing direction), decreases. The linear member LM that has moved in the direction perpendicular to the pushing direction then moves in the +Z direction, which is the direction opposite to the pushing direction (see arrow C in step S30 of FIG. 8). As a result, the linear member LM extends in the direction opposite to the pushing direction. In the present embodiment, the conductor CD and the insulating material IM around the conductor CD are pushed out in the +Z direction. Since the linear member LM is not pushed in the -Z direction (the pushing direction), the bottom OD1 of the original concave portion OD is prevented from being blocked. And as the conductor CD moves, the original concave portion OD expands in the X-axis and Y-axis directions.

[0028] Note that, as described above, in the present embodiment, the dimension of the rear end 120 is smaller than 90% of the dimension in the direction perpendicular to the direction in which the linear member LM is pushed in. Compared with the aspect in which the dimension of the rear end 120 is 90% or more of the dimension in the direction perpendicular to the direction in which the linear member LM is pushed in, more linear members LM remain in the direction perpendicular to the direction in which the linear member LM is pushed in. In the present embodiment, more conductors CD remain between the original recess OD and the rear end 120. When there are few conductors CD, when the rear end 120 is pushed in, the conductors CD around the rear end 120 may be pushed in the -Z direction together with the rear end 120, losing to the pushing force. In the present embodiment, it is possible to further suppress the linear member LM from being pulled in the direction in which the linear member LM is pushed in by the pushing portion 10.

[0029] In step S40 of FIG. 7, the molding portion 20 is pushed into the original recess OD (see step S40 of FIG. 8). For example, there may be a case where it is desired to form a hole having a dimension in the pushing direction larger than the dimension DH3 from the front end 110 to the rear end 120. In an aspect not provided with the molding portion 20, after the rear end 120 of the pushing portion 10 is pushed into the original recess OD, if the pushing portion 10 continues to be pushed into the original recess OD, the conductors CD moved in the X-axis and Y-axis directions, which are directions perpendicular to the pushing direction, may flow into the original recess OD. By providing the molding portion 20, the conductors CD moved in the direction perpendicular to the direction in which the pushing portion 10 pushes are more likely to move in the direction opposite to the pushing direction while contacting the molding portion 20 thereafter. Since the molding portion 20 suppresses the conductors CD moved in the direction opposite to the direction in which the pushing portion 10 pushes from moving toward the original recess OD thereafter, it becomes easy to form the molding recess MR.

[0030] In step S50 of FIG. 7, the processing device 1 is pulled out from the linear member LM. As a result, the formed recess MR is formed. In the present embodiment, as described above, the cross-sectional shape of the formed recess MR is rectangular, the long side of the formed recess MR is parallel to the long side of the outer shape of the linear member LM, and the short side of the formed recess MR is parallel to the short side of the outer shape of the linear member LM. Therefore, when the user inserts another linear member LM into the formed recess MR, positioning becomes easy. As a result, it is possible to easily insert it into the formed recess MR.

[0031] B. Other embodiments: B1. Other embodiment 1: (1) In the above embodiment, at the end face LME of the conductor CD, by cutting the conductor CD by cutting, the original recess OD extending along the direction in which the conductor CD extends from the surface of the end face LME of the conductor CD was formed. For example, a member may be pushed into the end of the conductor, and the original recess may be formed by pushing the conductor in the direction opposite to the pushing direction.

[0032] (2) In the above embodiment, the outer shape of the cross-section perpendicular to the pushing direction of the tip 110 and the rear end 120 of the pushing portion 10 is rectangular. For example, the outer shape of the cross-section perpendicular to the pushing direction of the tip and the rear end of the pushing portion may be triangular, pentagonal, or hexagonal. In this aspect, in at least a part of the depth direction of the formed recess, the shape in the cross-section perpendicular to the depth direction is the same as the polygonal shape of the rear end.

[0033] (3) In the above embodiment, the original recess OD has a substantially circular shape when viewed in the Z direction. For example, the original recess may have an elliptical shape when viewed in the Z direction.

[0034] (4) In the above embodiment, the linear member LM includes a conductor CD and an insulating material IM. For example, the linear member may include only a conductor.

[0035] (5) In the above-described embodiment, the values of the radii of curvature of the four corner portions 111 of the tip 110 in the cross-section including the X-axis and the Y-axis are all configured to be the same. For example, the values of the radii of curvature of the corner portions of the tip may be different. For example, even if the smallest value among the radii of curvature of the corner portions of the tip is outside the range of ±10% of the largest value, it may be acceptable. In this aspect as well, the processing apparatus is configured such that, as it goes from the rear end toward the tip, the radius of curvature of the polygonal corner portion in the cross-section perpendicular to the pushing-in direction increases.

[0036] (6) In the above-described embodiment, the values of the radii of curvature of the four corner portions 121 of the rear end 120 in the cross-section including the X-axis and the Y-axis are all configured to be the same. For example, the values of the radii of curvature of the corner portions of the rear end may be different. For example, even if the smallest value among the radii of curvature of the corner portions of the rear end is outside the range of ±10% of the largest value, it may be acceptable. In this aspect as well, the processing apparatus is configured such that, as it goes from the rear end toward the tip, the radius of curvature of the polygonal corner portion in the cross-section perpendicular to the pushing-in direction increases.

[0037] (7) In the above-described embodiment, the molding recess MR has a constant polygonal shape in the cross-section perpendicular to the depth direction in the depth direction. For example, in the aspect where the dimension in the depth direction of the molding recess is smaller than the dimension in the depth direction of the original recess, the molding recess has a portion where the shape in the cross-section perpendicular to the depth direction is a constant polygon in a part of the depth direction, and in other parts of the depth direction, it may have a shape with a substantially circular cross-section. The molding recess has a portion where the shape in the cross-section perpendicular to the depth direction is a constant polygon in at least a part of the depth direction.

[0038] B2. Other Embodiment 2: (1) In the above-described embodiment, the processing apparatus 1 includes a molding portion 20. For example, in the aspect of forming a molding recess having the same dimension as the dimension of the pushing portion in the pushing direction, the processing apparatus may not include a molding portion.

[0039] (2) In the above embodiment, the value obtained by adding the first dimension DH4 to the dimension DH3 from the front end 110 to the rear end 120 of the pushing portion 10 is larger than the dimension DHL in the pushing direction of the original recess OD. For example, the molding portion may be configured such that the value obtained by adding the first dimension to the dimension from the front end to the rear end of the pushing portion is the same as the dimension in the pushing direction of the original recess.

[0040] Also, for example, the molding portion may be configured such that the value obtained by adding the first dimension to the dimension from the front end to the rear end of the pushing portion is smaller than the dimension in the pushing direction of the original recess.

[0041] (3) In the above embodiment, the radius of curvature of the rectangular corner portion 210 of the molding portion 20 is the same as the radius of curvature of the rear end 120 of the pushing portion 10. For example, the radius of curvature of the corner portion of the molding portion may be larger than the radius of curvature of the corner portion of the rear end.

[0042] B3. Other Embodiment 3: (1) In the above embodiment, the dimension of the rear end 120 in the direction perpendicular to the pushing direction is smaller than 90% of the dimension of the linear member LM in the direction perpendicular to the pushing direction. Note that, for example, the dimension of the rear end in the direction perpendicular to the pushing direction may be 90% or more of the dimension of the linear member in the direction perpendicular to the pushing direction.

[0043] (2) For example, the processing device may be configured such that the dimension of the rear end in the direction perpendicular to the pushing direction is larger than 80% and smaller than 90% of the dimension of the linear member in the direction perpendicular to the pushing direction.

[0044] B4. Other Embodiment 4: (1) In the above embodiment, the forming recess MR has a long side parallel to the long side of the outer shape of the linear member and a short side parallel to the short side of the outer shape of the linear member. For example, in an aspect where the shape of the forming recess in a cross section perpendicular to the pushing-in direction is rectangular, the long side does not have to be parallel to the long side of the outer shape of the linear member. Also, for example, the short side of the forming recess does not have to be parallel to the short side of the outer shape of the linear member.

[0045] (2) For example, in an aspect where the shape of the forming recess in a cross section perpendicular to the pushing-in direction is rectangular, the long side may be parallel to the short side of the outer shape of the linear member and the short side may be parallel to the long side of the outer shape of the linear member.

[0046] The present disclosure is not limited to the above-described embodiments and can be realized in various configurations without departing from the gist thereof. For example, the technical features of the embodiments corresponding to the technical features in each aspect described in the summary of the invention can be appropriately replaced or combined in order to solve some or all of the above-described problems or to achieve some or all of the above-described effects. Also, if the technical feature is not described as essential in this specification, it can be appropriately deleted.

Description of Reference Numerals

[0047] 1... processing device, 10... pushing-in part, 20... forming part, 110... tip, 111... corner of the tip, 120... rear end, 121... corner of the rear end, 210... corner of the forming part, CD... conductor, IM... insulating material, LM... linear member, LME... end face, MR... forming recess, OD... original recess, OD1... bottom

Claims

1. A processing apparatus for forming a recess on an end face of a linear member, wherein the recess has a portion where the shape in a cross-section perpendicular to the depth direction is a regular polygon at least in a part of the depth direction, the processing apparatus includes a pushing portion that is pushed into the original recess while expanding the original recess formed in advance along the direction in which the linear member extends on the end face of the linear member, when projected in the pushing direction, the pushing portion has an outer shape of a tip end that is included in the outer shape of a rear end in the pushing direction, and has a tapered side surface from the tip end toward the rear end, the outer shape of a cross-section perpendicular to the pushing direction at the rear end of the pushing portion is the regular polygon, the pushing portion has a shape in which the radius of curvature of a corner portion of the regular polygon in a cross-section perpendicular to the pushing direction increases from the rear end toward the tip end. A processing apparatus.

2. The processing apparatus according to claim 1, further comprising a forming portion that is connected to the rear end of the pushing portion and is pushed into the original recess, the forming portion has the regular polygon in a shape of a cross-section perpendicular to the pushing direction, a dimension in the pushing direction is a first dimension that is a predetermined dimension, and a value obtained by adding the first dimension to a dimension from the tip end to the rear end of the pushing portion in the pushing direction is equal to or greater than a dimension of the original recess in the pushing direction. A processing apparatus.

3. The processing apparatus according to claim 1, wherein a dimension of the rear end in a direction perpendicular to the pushing direction is smaller than 90% of a dimension of the linear member in a direction perpendicular to the pushing direction. A processing apparatus.

4. The processing apparatus according to claim 1, wherein a shape of a cross-section perpendicular to the pushing direction of the linear member is a rectangle, the recess has a long side parallel to a long side of an outer shape of the linear member, and a short side parallel to a short side of the outer shape of the linear member. A processing apparatus.

5. A recess forming method for forming a recess on an end face of a linear member, wherein the recess has a portion where the shape in a cross-section perpendicular to the depth direction is a regular polygon at least in a part of the depth direction, forming an original recess along the direction in which the linear member extends on the end face of the linear member, and pushing a pushing portion into the original recess. When projected in the direction in which it is pushed in, the outer shape of the tip in the direction in which it is pushed in is a shape included in the outer shape of the rear end, and it has a tapered side surface from the tip toward the rear end. The outer shape of the cross-section perpendicular to the direction in which it is pushed in at the rear end of the pushing-in part is the polygonal shape. The pushing-in part A concave portion forming method having a shape in which the radius of curvature of the corner of the polygonal shape in the cross-section perpendicular to the direction in which it is pushed in increases as it goes from the rear end to the tip.

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