JP2008173657A - Metal joining method and armature manufacturing method - Google Patents

Abstract

A method of manufacturing an armature capable of satisfactorily joining a connecting portion of a segment of a commutator and a conducting wire with low energy.
A through hole 116b is provided in advance in a connecting portion 116a of a commutator segment, and a first opening 116c of the through hole 116b is disposed so as to be closed by a conductor main body Da in a conductor connecting portion Mb of the conductor D. The laser beam LB is irradiated around the second opening 116d of the through-hole 116b in the connection portion 116a, and the conductive wire body Da is irradiated through the through-hole 116b to join the connection portion 116a and the conductive wire body Da by laser welding. A joining step is provided.
[Selection] Figure 9

Description

  The present invention relates to a metal joining method for joining, for example, a commutator segment and a conductive wire by laser welding, and an armature manufacturing method.

Conventionally, a connecting portion extending from a commutator segment in a motor armature and a conductive wire constituting a winding are electrically connected. And there exists a method of joining by laser welding as a method of joining such a connection part and conducting wire (for example, refer to patent documents 1). Further, the joining by laser welding is not limited to the connection portion and the conducting wire, but is utilized as a method of joining another first metal member and another second metal member. For example, the first metal plate and the second metal plate are arranged so as to overlap each other in the thickness direction, and the plane of the first metal plate is irradiated with laser light to transfer heat to the second metal plate. And a method in which the side surface of the first metal plate (that is, the surface in the direction perpendicular to the thickness direction) and the plane and side surfaces of the second metal plate are directly irradiated with laser light and bonded together.
JP-A-9-182385

  However, in the method of irradiating the laser beam onto the plane of the first metal plate and transferring the heat to the second metal plate, the heat is only transferred from the first metal plate to the second metal plate. High energy is required.

  In the method in which the side surface of the first metal plate (that is, the surface in the direction perpendicular to the thickness direction) and the flat surface or side surface of the second metal plate are directly irradiated and joined simultaneously, the first and first Since each of the two metal plates directly receives the energy of the laser beam, it can be bonded with a relatively low energy. However, in this method, since the joining position is limited to the side surface of the first metal plate, it is difficult to irradiate the joining position with laser light in terms of space or the size of the first and second metal plates. Depending on the sheath and shape, the bonding strength as a whole becomes weak, and good bonding cannot be obtained.

  The present invention has been made to solve the above-mentioned problems, and a first object of the present invention is a metal that can satisfactorily join the first metal member and the second metal member with low energy. It is in providing the joining method of this.

  A second object is to provide a method of manufacturing an armature that can satisfactorily join a segment connecting portion of a commutator and a conducting wire with low energy.

  According to the first aspect of the present invention, there is provided a metal joining method for joining a first metal member and a second metal member by laser welding, wherein a through hole is provided in the first metal member in advance, and the through-hole is provided. The first opening of the hole is disposed so as to be closed by the second metal member, and laser light is applied to at least part of the periphery of the second opening of the through hole in the first metal member. A joining step of joining the first metal member and the second metal member by irradiating the second metal member through the through hole is provided.

  According to the invention, in the joining step, laser light is applied to at least a part of the periphery of the second opening of the through hole in the first metal member, and the first through hole is formed through the through hole. The second metal member that closes the opening is irradiated to each of the first and second metal members and directly receives the energy of the laser beam. In addition, a part of the laser light applied to the second metal member is reflected, but a part of the reflected laser light is applied to the inner surface of the through hole, and the inner surface receives the energy of the laser light. From these things, a 1st metal member and a 2nd metal member can be favorably joined by low energy. In addition, since the position where the through hole is provided can be set as appropriate according to the object or the like (its size, shape, and surrounding members), the position where the laser beam is irradiated and thus the bonding position should be set as appropriate. Can do. Therefore, for example, it can be avoided that it is difficult to irradiate the laser beam in terms of space, and the overall bonding strength can be increased.

According to a second aspect of the present invention, in the metal bonding method according to the first aspect, the through hole is set such that the second opening is smaller than the first opening.
According to the present invention, since the through hole is set such that the second opening is smaller than the first opening, a part of the laser beam reflected by the second metal member is formed between the inner surface of the through hole and the second hole. It is easy to repeat the reflection with the metal member, and it is possible to reduce the reflection of the laser beam to the outside. Therefore, the first metal member and the second metal member can be favorably bonded with lower energy.

  According to a third aspect of the present invention, in the metal joining method according to the second aspect, a hole forming step of forming the through hole with a drilling jig having a reduced diameter portion that decreases in diameter toward the tip. Prepared.

According to the present invention, since the through hole is formed by the drilling jig provided with the reduced diameter portion that decreases in diameter toward the tip, the through hole according to claim 2 can be easily formed.
According to a fourth aspect of the present invention, there is provided a method of manufacturing an armature including a joining step in the metal joining method according to any one of the first to third aspects, wherein the first metal member is a rectifier. It is a connection part extended from the segment of a child, Comprising: A said 2nd metal member is a part of conducting wire which comprises a coil | winding.

  According to the invention, in the joining step, the laser beam is applied to at least a part of the periphery of the second opening of the through hole in the connection portion extending from the commutator segment and through the through hole. A part of the conducting wire that closes the first opening of the through hole is irradiated, and the connecting portion and the conducting wire each receive the energy of the laser beam directly. Further, a part of the laser light irradiated to the conducting wire is reflected, but a part of the reflected laser light is irradiated to the inner surface of the through hole, and the inner surface receives the energy of the laser light. From these things, a connection part and a conducting wire can be favorably joined with low energy. And since the through-hole was provided in the connection part side, the damage in a junction part can be reduced. Specifically, since the conducting wire is often provided with a constant diameter or a tight binding force, there is a high possibility that if the through hole is provided in the conducting wire, it will be cut, but relatively freely. Since the through-hole is provided on the side of the connecting portion that can be designed and is easy to maintain rigidity, it is possible to reduce damage at the joint portion. In addition, since a certain amount of current flows through the conducting wire, if a through hole is provided in the conducting wire, the cross-sectional area is small at that portion, that is, the resistance increases and the possibility of heat generation increases, and cutting is based on the generated heat. Although the possibility that it will be carried out becomes high, the damage based on this cause can also be reduced.

According to a fifth aspect of the present invention, in the armature manufacturing method according to the fourth aspect, the connecting portion has a curved portion along the outer periphery of the conducting wire, and the through hole is provided in the curved portion.
According to the invention, since the connecting portion has a curved portion along the outer periphery of the conducting wire and the through hole is provided in the curved portion, the connecting portion and the conducting wire are in close contact with each other over a wide range, and their positional deviation is Prevented and joined. Therefore, the connection portion and the conducting wire can be easily and firmly joined.

According to a sixth aspect of the present invention, in the armature manufacturing method according to the fourth or fifth aspect, a plurality of the through holes are provided along the conducting wire.
According to the invention, a plurality of through holes are provided along the conducting wire, and a plurality of joining portions are provided along the conducting wire, so that the connecting portion and the conducting wire are easily and firmly joined.

According to invention of Claims 1-3, the metal joining method which can join the 1st metal member and the 2nd metal member favorably with low energy can be provided.
Moreover, according to the invention of Claims 4-6, the manufacturing method of the armature which can join the connection part of a segment of a commutator and conducting wire favorably with low energy can be provided.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the DC motor 101 of this embodiment includes a stator 102 and an armature (rotor) 103. The stator 102 includes a substantially cylindrical yoke housing 104 and a plurality (six in this embodiment) of magnets 105 arranged and fixed at equal angular intervals on the inner peripheral surface of the yoke housing 104. In the present embodiment, six magnets 105 (six poles) are provided and the number of magnetic poles is six.

  As shown in FIGS. 1 and 2, the armature 103 includes a rotating shaft 106, an armature core 107 fixed to the rotating shaft 106, and a commutator 108 that is also fixed to the rotating shaft 106. As shown in FIG. 2, the armature 103 can be rotated by a bearing G held on a housing including a yoke housing 104 (specifically, an end housing E that closes the yoke housing 104 and its opening) on both ends of the rotating shaft 106. It is supported by. In this state, the anode-side and cathode-side brushes 109a and 109b, which are held by the end housing E and perform power feeding, are pressed and slidably contacted with the outer periphery of the commutator 108. In this state, the armature core 107 is disposed so as to face the magnet 105 and be surrounded by the periphery.

  The armature core 107 has eight teeth T1 to T8 that extend radially about the rotation shaft 106, and slots S1 to S8 are formed between the teeth T1 to T8, respectively (FIG. 1). And FIG. 4 (a)).

  More specifically, as shown in FIG. 5, the armature core 107 has an annular fixed portion in which the rotation shaft 106 is fitted and a circumferential connection portion 107 a that connects the base ends of the teeth T <b> 1 to T <b> 8 in the circumferential direction. A portion 107b and a radial connecting portion 107c extending radially inward from a portion of the circumferential connecting portion 107a in the circumferential direction (every 90 °) and connecting the circumferential connecting portion 107a and the fixing portion 107b.

  An insulator X (see FIG. 5) is attached to one end side (upper side in FIG. 2) of the armature core 107 where the commutator 108 is disposed, and the axial direction is the side where the commutator 108 is not disposed. An insulator Y (see FIG. 6) is attached to the other end side (the lower side in FIG. 2).

  As shown in FIG. 5, the insulator X corresponds to the annular covering portion Xa covering the circumferential connecting portion 107a, the teeth covering portion Xb covering the teeth T1 to T8, and the base ends of the teeth T1 to T8. The separation part Xc arranged in the above-mentioned manner and the placement convex part Xd arranged on the radially inner side of the separation part Xc (that is, on the annular covering part Xa) are provided. The insulator X is made of resin, and the respective parts (the annular covering part Xa, the teeth covering part Xb, the separating part Xc, and the mounting convex part Xd) are integrally formed. The annular covering portion Xa includes an axial covering portion Xe that covers the circumferential connecting portion 107a from the axial direction, and a radial covering portion that covers the outer peripheral surface (between adjacent teeth T1 to T8) of the circumferential connecting portion 107a from the radial direction. Xf. The radial covering portion Xf is formed in a rectangular shape when viewed from the axial direction so as to protrude outward in the radial direction toward the center between the teeth T1 to T8 adjacent in the circumferential direction, and is recessed radially inward at the corner. A groove Xg extending in the axial direction is formed. The angular angle is an angle corresponding to a regular octagon. The groove Xg is recessed in a substantially arc shape. Further, the separation part Xc protrudes in the axial direction from the tooth coating part Xb. The separation part Xc is formed so as to partition the teeth covering part Xb side and the placement convex part Xd side at the base end parts of the teeth T1 to T8. Further, the separation portion Xc is provided with a recess Xh extending from the radially inner side to the radially outer side. Moreover, the mounting convex part Xd protrudes in the axial direction from the teeth covering part Xb, and the protruding amount is set smaller than that of the separating part Xc. The mounting convex portion Xd of the present embodiment is formed in a substantially trapezoidal shape as viewed from the radial direction (a substantially trapezoidal shape in which the shorter of the two parallel sides is set at the tip (top surface)) ( (See FIG. 7). In addition, a gap forming groove Xi is formed in the center in the circumferential direction at the tip (top surface) of the mounting convex portion Xd.

  As shown in FIG. 6, the insulator Y corresponds to the annular covering portion Ya covering the circumferential connecting portion 107a, the teeth covering portion Yb covering the teeth T1 to T8, and the base end portions of the teeth T1 to T8. An outer wall Yc projecting in the axial direction intermittently in the circumferential direction and an inner wall Yd projecting in the axial direction in a substantially cylindrical shape inside the outer wall Yc (inner edge of the annular covering portion Ya) are provided. In the present embodiment, the outer wall Yc and the inner wall Yd constitute a guide part. The insulator Y is made of resin, and the respective parts (the annular covering part Ya, the teeth covering part Yb, the outer wall Yc, and the inner wall Yd) are integrally formed. The annular covering portion Ya includes an axial covering portion Ye that covers the circumferential connecting portion 107a from the axial direction, and a radial covering portion that covers the outer peripheral surface (between adjacent teeth T1 to T8) of the circumferential connecting portion 107a from the radial direction. Yf. The radial covering portion Yf is formed in a square shape when viewed from the axial direction so as to protrude outward in the radial direction toward the center between the teeth T1 to T8 adjacent in the circumferential direction, and is recessed radially inward at the corner. A groove Yg extending in the axial direction is formed. The angular angle is an angle corresponding to a regular octagon. Further, the groove Yg is recessed in a substantially arc shape.

  The armature 103 has windings M1 to M8 wound in concentrated winding on the teeth T1 to T8 of the armature core 107 to which the insulators X and Y are mounted (through the slots S1 to S8). And the conducting wire D which comprises continuously the connecting wire 110 (refer FIG.2, FIG.10 and FIG.11) which connects several coil | windings M1-M8 is provided. FIG. 4A is a schematic diagram in which the armature 103 is developed in a planar shape. The windings M1 to M8 are entirely disposed in the radial direction of the teeth T1 to T8 by being wound around the teeth T1 to T8 (with respect to the teeth T1 to T8). It is arranged so as to have a binding force. The crossover wire 110 is disposed across (beyond) at least one of the teeth T1 to T8 disposed in the circumferential direction so as to connect the two teeth (in the direction orthogonal to the axis). It is arranged to have tension.

  For example, the conductive wire D of the present embodiment first forms a winding M1 by being wound around the tooth T1 in a concentrated winding, and then forms a crossover 110 that reaches the tooth T6 across the teeth T8 and T7. Next, a pattern in which the winding M6 is formed by concentrated winding on the tooth T6 is repeatedly provided (see FIG. 11). FIG. 11 illustrates an intermediate stage in the process of arranging the conductive wire D as described above (a “conductor layout process” described later).

  In addition, each of the windings M1 to M8 is the last winding (the last one winding), except for the end winding Ma (see FIGS. 1 and 7) as a part of the windings of the separating portion Xc. Winding around the teeth T1 to T8 on the outer side in the radial direction and the movement toward the inner side in the radial direction is restricted by the separation portion Xc. In addition, the conductor connecting portion Mb as the second metal member, which is a part of the end winding Ma, is locally on the placement convex portion Xd and in the portion where the gap forming groove Xi is formed. It arrange | positions spaced apart from the mounting convex part Xd. That is, each of the windings M1 to M8 is separated into an end winding Ma (partial windings) and other windings by the separation part Xc.

  Moreover, each crossover 110 is arranged avoiding the above-mentioned placement convex part Xd. Specifically, as shown in FIGS. 2, 10, and 11, each crossover wire 110 is arranged on the other end side in the axial direction of the armature core 107 (the side opposite to the side where the commutator 108 is arranged). Each connecting wire 110 is guided along the circumferential direction radially inward of the teeth T1 to T8 by the guide portions (the outer wall Yc and the inner wall Yd). That is, the crossover wires 110 are restricted from moving radially outward by the outer wall Yc, and restricted radially outward by the inner wall Yd.

  Further, in the lead wire D, the lead wire connecting portion Mc (see FIG. 10) for connecting the lead wire connecting portion Mb (the one axial end side) and the connecting wire 110 (the other axial end side) is formed in the grooves Xg and Yg. Placed (substantially half accommodated).

  As shown in FIG. 2, the commutator 108 includes a commutator body 111 and a short-circuit member 112. The commutator body 111 includes a substantially cylindrical main body insulating material 113 and 24 segments 1 to 24 (see FIG. 4A) disposed on the outer peripheral surface of the main body insulating material 113 in the circumferential direction. The segments 1 to 24 are substantially cylindrical on the outer periphery of the main body insulating material 113, and the anode side and cathode side brushes 109a and 109b are brought into contact (pressing contact) from the outside in the radial direction.

  The short-circuit member 112 is fixed to the axial end of the commutator body 111 and electrically connects the 24 segments 1 to 24 at intervals of 120 degrees as shown in FIG. , 9, 17 and segments 5, 13, 21 are short-circuited (same potential). Specifically, as shown in FIG. 3, the short-circuit member 112 includes 24 short-circuit pieces 115 and 116 disposed in two layers sandwiching an insulating layer (insulating paper) 114, respectively. Each short-circuit piece 115 on one side (the layer on the front side in FIG. 3) has its radially inner end shifted by 60 ° in the circumferential direction (clockwise in FIG. 3) with respect to the radially outer end. It is formed as follows. In addition, each short-circuit piece 116 on the other side (in FIG. 3, a layer on the back side of the paper and indicated by a broken line) has a radially inner end portion that is circumferentially opposite to a radially outer end portion (in FIG. 3). , In a counterclockwise direction). The short-circuit pieces 115 and 116 of the two layers are electrically connected to each other between the radially inner ends and the radially outer ends (without the insulating layer 114 interposed). Thereby, the radial direction outer side edge part of the short circuit pieces 115 and 116 in the short circuit member 112 will be electrically connected to a 120 degree space | interval.

  And the short circuit member 112 is being fixed to the commutator main body 111 so that each radial direction outer side edge part may be electrically connected to the segments 1-24, respectively. In the present embodiment, the other end (the layer on the back side of the paper in FIG. 3 and indicated by a broken line) extends radially outward from the segments 1 to 24 at the radially outer end of the short-circuit piece 116. A connecting portion 116a (see FIG. 8) is formed as a first metal member. The connecting portion 116a is joined and electrically connected and fixed on the conducting wire connecting portion Mb, which is a part of the end winding Ma, on the placement convex portion Xd. Further, as shown in FIGS. 3, 8, and 9, a through hole 116b is formed in the connecting portion 116a in advance. Further, as shown in FIG. 9, in the through hole 116b of the present embodiment, the first opening 116c on the side where the conductor connecting portion Mb is disposed and closed is smaller than the second opening 116d on the opposite side. Is set. Specifically, the through-hole 116b of the present embodiment is circular when viewed from the penetration direction, and the diameter thereof is set so as to decrease as it goes from the second opening 116d to the first opening 116c. .

  Moreover, the conducting wire D has a conducting wire body Da (see FIG. 9) made of a conductive metal (copper in the present embodiment) and an insulating film that covers the conducting wire body Da. Then, the insulating film in the conductor connecting portion Mb is removed, and the conductor main body Da exposed at the portion and the connecting portion 116a are joined and electrically connected (see FIG. 9). In FIG. 9, the conductor connection portion Mb from which the insulating film has been removed, that is, the conductor connection portion Mb having only the conductor main body Da is illustrated. Further, FIG. 9 illustrates a state before the conductor connecting portion Mb (conductor main body Da) and the connecting portion 116a are joined. Further, in the present embodiment, the conductor connecting portion Mb and the connecting portion 116a are stacked on the placement convex portion Xd in the axial direction. Specifically, the connection portion 116a sandwiches the conductor connecting portion Mb together with the placement convex portion Xd. Placed in. The connecting portion 116a is disposed at a position corresponding to the concave portion Xh and the circumferential direction. Further, the connection portions 116a are formed at intervals of three (that is, eight in total) in the circumferential direction of the 24 short-circuit pieces 116.

  Next, a manufacturing method (including a metal bonding method) of the armature 103 configured as described above will be described in detail. The manufacturing method of the armature 103 includes a “conductor arrangement step”, a “film removal step”, and a “joining step”.

  In the “conductor arrangement step”, a part of the windings M1 to M8 is formed by the conductor D (that is, during the winding operation) at a position corresponding to the connecting portion 116a (in this embodiment, mounted). (On the placement convex part Xd). Specifically, in the present embodiment, when each of the windings M1 to M8 is configured by the conductive wire D, the end winding Ma (as a partial winding which is the final winding (the last one winding) in each of the windings M1 to M8) 1 and FIG. 7) are arranged radially inward of the separation part Xc (so as to pass over the mounting convex part Xd), and other windings except for the end winding Ma are arranged in the radial direction of the separation part Xc. Place outside. In the present embodiment, the crossover wire 110 is disposed on the other end side in the axial direction of the armature core 107 (the side where the commutator 108 is not disposed) (see FIG. 11).

  Next, in the “film removal step”, as shown in FIG. 7, the conductor connection portion Mb in the conductor D is irradiated with the laser beam LB to remove the insulating film in the portion, and the conductor main body Da (see FIG. 9) is removed. Expose. In the present embodiment, since the conductor connecting portion Mb is separated from the placement convex portion Xd by the gap forming groove Xi, heat generated during the “film removal step” is transmitted to the placement convex portion Xd. Is reduced.

  Next, in the “joining step”, first, the commutator 108 is positioned in the axial direction with respect to the armature core 107, thereby bringing the connecting portion 116 a into contact with the conducting wire D in the axial direction. Specifically, in the present embodiment, the commutator 108 is fixed by press-fitting to the rotating shaft 106 to which the armature core 107 is fixed, thereby positioning in the axial direction, thereby connecting the connection portion 116a to the conductor D. The exposed conductor main body Da in the part Mb is contacted in the axial direction (see FIGS. 8 and 9). Further, at this time, as shown in FIG. 9, the first opening 116c of the through hole 116b in the connection portion 116a is arranged so as to be closed by the conductor main body Da in the conductor connection portion Mb. Further, in this embodiment, at this time, the connecting portion 116a and the mounting convex portion Xd (excluding the portion where the gap forming groove Xi is formed) are used to connect the conducting wire connecting portion Mb (the conducting wire main body Da) of the conducting wire D to the shaft. Hold in the direction.

  Then, as shown in FIGS. 8 and 9, the laser beam LB is irradiated around the second opening 116d of the through hole 116b in the connecting portion 116a and is also irradiated to the conductor main body Da through the through hole 116b. The connecting portion 116a and the conductor main body Da are joined by laser welding, and they are electrically connected and fixed. In the “film removal process” and the “bonding process” of the present embodiment, the laser beam LB is irradiated using the same laser beam irradiation apparatus.

  In the armature 103 configured as described above, the windings M1 to M8 constitute one closed loop in total. Note that the windings M1 to M8 of this embodiment form a closed loop in the order of M1, M4, M7, M2, M5, M8, M3, M6, M1,. That is, when the circuit formed by the windings M1 to M8 in FIG. 4A is developed in a visually easy-to-understand manner, it is as shown in FIG. 4B.

Next, characteristic effects of the above embodiment will be described below.
(1) In the “joining step”, the laser beam LB is irradiated around the second opening 116d of the through hole 116b in the connecting portion 116a and the conductor main body Da in the conductor connecting portion Mb through the through hole 116b. The connection part 116a and the conductor main body Da receive the energy of the laser beam LB directly. Further, a part of the laser beam LB irradiated to the conductor main body Da is reflected, but a part of the reflected laser beam LB is irradiated to the inner surface of the through hole 116b, and the energy of the laser beam LB is also applied to the inner surface. receive. From these things, the connection part 116a and the conducting wire main body Da in the conducting wire connection part Mb can be favorably joined with low energy. And since the through-hole 116b was provided in the connection part 116a side, the damage in a junction part can be reduced. In detail, since the conducting wire D (the conducting wire body Da) has a constant diameter and is provided with a binding force, there is a high possibility that the conducting wire body Da will be cut if a through hole is provided in the conducting wire body Da. Since the through-hole 116b is provided on the side of the connecting portion 116a that can be designed relatively freely and can easily maintain rigidity, it is possible to reduce breakage at the joint portion such as cutting. In addition, since a certain amount of current flows through the conductor D (conductor body Da), if a through hole is provided in the conductor body Da, the cross-sectional area is small at that portion, that is, the resistance increases and the possibility of heat generation is high. Therefore, the possibility of being cut based on the heat generation is increased, but the damage due to this cause can also be reduced.

  (2) The through hole 116b is set so that the first opening 116c on the side where the conducting wire connecting portion Mb (the conducting wire main body Da) is disposed and closed is smaller than the second opening 116d. The inner surface of the through hole 116b is also directly irradiated. Therefore, the connection part 116a and the conducting wire main body Da in the conducting wire connection part Mb can be satisfactorily joined with lower energy.

  (3) Since the insulation film is removed in the “film removal process” before the “bonding process”, bonding defects can be reduced compared to the case where the bonding is performed while melting the insulation film in the “bonding process”. it can. In the “film removal process” and the “bonding process”, the same laser beam irradiation apparatus is used to irradiate the laser beam LB. Therefore, different laser beam irradiation apparatuses are used in the “film removal process” and the “bonding process”. Compared with the case where it exists, the space-saving and cost reduction of an installation, ie, the manufacturing apparatus of the armature 103, can be achieved.

  (4) In the “conductive wire arranging step”, in the process of forming the windings M1 to M8 by the conductive wire D (that is, during the winding operation), a part thereof is arranged at a position corresponding to the connecting portion 116a. That is, in the “conductive wire arranging step”, an operation such as “winding the conductive wire around the connecting portion”, which is an operation far from the process of forming the windings M1 to M8 and the crossover wire 110 by the conductive wire D, is not performed, but simply the winding M1. In a series of processes constituting .about.M8, a part thereof (conductive wire connecting part Mb of the end winding Ma) is arranged at a position corresponding to the connecting part 116a. Therefore, the manufacturing process can be simplified as compared with the case where “the conductive wire is wound around the connecting portion”, and the manufacturing time can be shortened. Further, in the “joining step”, since the connecting portion 116a and the conducting wire D are electrically connected by laser welding, the conducting wire D (the conducting wire connecting portion Mb) is disposed at a position corresponding to the connecting portion 116a as described above. Only “the conductor arrangement step” is sufficient (just contacting them so as to overlap each other as in the present embodiment). In other words, when welding is performed by bringing a jig into contact with each other, it is necessary to secure a space for contacting the jig (for example, a pair of electrodes) (for example, by winding a conducting wire around the connecting portion). On the other hand, in the case of laser welding, the space becomes unnecessary, and therefore, the connection portion 116a and the connection portion 116a The lead wire D can be easily electrically connected.

The above embodiment may be modified as follows.
In the above embodiment, the number of through-holes 116b of the connecting portion 116a is one, but the number of through-holes may be plural. For example, as shown in FIG. A plurality (three in this example) may be provided along (the conductor connecting portion Mb). If it does in this way, since a joined part will become plural along with conducting wire D, connecting part 201 and conducting wire D (the above-mentioned conducting wire connecting part Mb) will be joined easily and firmly.

  In the above embodiment, the first metal member is the connecting portion 116a and the second metal member is the conductive wire connecting portion Mb (conductive wire main body Da). However, the present invention is not limited to this, and other first metal members It is good also as a metal joining method which joins and other 2nd metal members by laser welding.

  For example, as shown in FIG. 13, the present invention is embodied in a metal joining method in which a first metal plate 301 as a first metal member and a second metal plate 302 as a second metal member are joined by laser welding. May be. Specifically, the first metal plate 301 is provided with a through-hole 303 in advance, and the first opening of the through-hole 303 is disposed so as to be closed by the second metal plate 302, and laser light is emitted from the first metal plate 301. It is good also as a method provided with the joining process of irradiating and joining to the 2nd metal plate 302 through the through-hole 303 while irradiating at least one part around the 2nd opening part of the through-hole 303 in FIG. In this example, three through holes 303 are provided.

  Even in such a case, in the “joining step”, the laser beam is applied to at least a part of the periphery of the second opening of the through hole 303 in the first metal plate 301 and through the through hole 303. The second metal plate 302 that closes the first opening of the through hole 303 is irradiated, and each of the first and second metal plates 301 and 302 directly receives the energy of the laser beam. In addition, a part of the laser light applied to the second metal plate 302 is reflected, but a part of the reflected laser light is applied to the inner surface of the through hole 303 and receives the energy of the laser light also on the inner surface. . From these things, the 1st metal plate 301 and the 2nd metal plate 302 can be favorably joined by low energy. In this example, three through-holes 303 are provided and joined at three positions. Of course, the number may be changed, and the side surface of the first metal plate 301 (that is, in the direction orthogonal to the thickness direction). Surface) and the flat surface of the second metal plate 302 may be directly irradiated with laser light at the same time, and the portion may be bonded. In addition, the position where the through hole is provided is not limited to this example, and can be set as appropriate according to the object (the size and shape of the object and the members disposed around it). Can be set as appropriate. Therefore, for example, it can be avoided that it is difficult to irradiate the laser beam in terms of space, and the overall bonding strength can be increased.

In the above embodiment and other examples, the through holes 116b and 303 are circular when viewed from the through direction, but are not limited thereto, and may be through holes of other shapes.
For example, as shown in FIG. 14A, when the first metal plate 401 and the second metal plate 402 are joined by laser welding, the through-hole 403 of the first metal plate 401 is viewed from the penetration direction. It may be formed in a quadrangular shape. Even in this case, the laser beam LB is irradiated to at least a part of the periphery of the second opening 404 of the through hole 403 in the first metal plate 401. In FIG. 14, it is shown by a two-dot chain line in correspondence with the range irradiated with the laser beam LB. In this example, the laser beam LB is included around each part of the second opening 404 of the through hole 403 and corresponding to each side (two opposing sides) when viewed from the axial direction. I am trying to irradiate. Further, the laser beam LB is not limited to this example, and it is desirable to irradiate the laser beam LB so as to include the periphery of the second opening corresponding to at least a part of the opposing surface of the through hole, and the effect becomes remarkable.

  Further, for example, as shown in FIG. 14B, when the first metal plate 501 and the second metal plate 502 are joined by laser welding, the through hole 503 of the first metal plate 501 is formed in the penetration direction. It may be formed in an oval shape when viewed from the top.

  Further, for example, as shown in FIG. 14C, when the first metal plate 601 and the second metal plate 602 are joined by laser welding, the through hole 603 of the first metal plate 601 is formed in the penetration direction. It is good also as what is partly extended in the orthogonal direction (right direction in a figure), and is connected to the outer side (1st metal plate 601), and is not closed in the circumferential direction.

  In the other examples (FIGS. 13, 14A to 14C, etc.), the first metal plates 301, 401, 501, 601 and the second metal plates 302, 402, 502, which are one member, However, the first metal plate as the first metal member may be composed of a plurality of metal plates as a plurality of metal members. For example, as shown in FIG. 14 (d), the first metal plate 651 as the first metal member is composed of two metal plates 651a and 651b, and the two metal plates 651a and 651b are simulated. You may implement by providing the through-hole 652 (by combining what was divided | segmented and formed in each metal plate 651a, 651b). That is, the first opening of the through hole 652 is arranged so as to be closed by the second metal plate 653, and the laser beam LB is passed through the through hole 652 in the first metal plate 651 (two metal plates 651a and 651b). It is good also as a method provided with the joining process of irradiating the 2nd metal plate 653 through the through-hole 652, and irradiating the circumference | surroundings of the 2nd opening part. If it does in this way, the 1st metal plate 651 (two metal plates 651a and 651b) and the 2nd metal plate 653 can be joined favorably with low energy. Of course, the first metal plate as the first metal member may be composed of three or more metal plates, and a pseudo through hole may be provided between the metal plates.

  In the above embodiment, the through-hole 116b is set such that the first opening 116c on the side where the conductive wire connecting portion Mb (conductive wire main body Da) is arranged and closed is smaller than the second opening 116d. However, it is not limited to this, For example, you may change into the through-hole by which the 1st and 2nd opening part was set to the same magnitude | size. Further, for example, as shown in FIG. 15, when the first metal plate 701 and the second metal plate 702 are joined by laser welding, a through hole 703 of the first metal plate 701 is formed as a second opening. You may set so that 704 may become smaller than the 1st opening part 705 by the side closed with the 2nd metal plate 702. FIG. The through hole 703 in this example is circular when viewed from the penetrating direction, and the diameter thereof is set so as to decrease from the first opening 705 toward the second opening 704.

  In this way, a part of the laser beam LB reflected by the second metal plate 702 can be easily reflected by the inner surface of the through hole 703 and the second metal plate 702, and the laser beam LB is reflected to the outside. Can be reduced. In FIG. 15, the laser beam LBa that repeats reflection is schematically shown by an arrow. Therefore, the first metal plate 701 and the second metal plate 702 can be favorably bonded with lower energy.

  In the above embodiment, the connecting portion 116a in which the through hole 116b is formed has a shape that only extends outward in the radial direction. However, the present invention is not limited to this. For example, as shown in FIG. A connecting portion 801 having a curved portion 801a along the outer periphery of the curved portion 801a may be provided, and a through hole 801b may be provided in the curved portion 801a. In addition, the through hole 801b in this example has a second opening 801d smaller than the first opening 801c on the side closed by the conducting wire D, that is, the diameter thereof is larger than that of the first opening 801c. It is set to become smaller toward the second opening 801d. Therefore, as in the other example (see FIG. 15), part of the laser beam LB reflected by the conducting wire D is easily reflected by the inner surface of the through hole 801b and the conducting wire D, and the laser beam LB is reflected to the outside. Can be reduced. In FIG. 16, the laser beam LBa that repeats reflection is schematically shown by an arrow. Although not described in detail in the other example shown in FIG. 12, in the other example shown in FIG. 12, the connecting portion 201 has a curved portion along the outer periphery of the conductor D, and the through hole 201a is curved. Provided in the department. If it does in this way, while connecting part 801 (201) and conducting wire D will adhere over a wide range, they will be joined, preventing the position gap. Therefore, the connection part 801 (201) and the conducting wire D can be joined easily and firmly.

  In this example (see FIG. 16), as shown in FIG. 17, the through hole 801b is formed by a cone 802 as a drilling jig provided with a reduced diameter portion 802a that decreases in diameter toward the tip. ("Hole forming process"). Specifically, in this “hole forming step”, as shown in FIG. 17, the cone 802 is formed from the concave side of the curved shape of the curved portion 801a of the connecting portion 801 where the through-hole 801b is not formed to the curved portion 801a. The through hole 801b is formed by relatively moving the reduced diameter portion 802a in the penetration direction. Of course, the cone 802 may be changed to another drilling jig such as a drill. In this way, the through hole 801b can be easily formed.

  In the above embodiment, the insulating film of the conductive wire connecting part Mb is removed in the “film removing process” before the “joining process”, but the present invention is not limited to this, and the conductive wire connecting part Mb with the insulating film remaining remains. Then, the first opening 116c of the through-hole 116b may be closed and irradiated with the laser beam LB, and bonding (“bonding step”) may be performed while melting the insulating film.

  In the above embodiment, the “film removal process” and the “bonding process” are performed by irradiating the laser beam LB using the same laser light irradiation apparatus, but the “film removal process” and the “bonding process” are different. You may use a laser beam irradiation apparatus. Further, for example, the “film removal step” in the above embodiment may be another “film removal step” in which the insulating film is removed by another method without irradiating the laser beam LB.

The technical idea that can be grasped from the above embodiments will be described below together with the effects thereof.
(A) The metal bonding method according to claim 1, wherein the through hole is set such that the first opening is smaller than the second opening.

  If it does in this way, since a 1st opening part is set smaller than a 2nd opening part, a laser beam is directly irradiated also to the inner surface of a through-hole. Therefore, the first metal member and the second metal member can be favorably bonded with lower energy.

  (B) In the armature manufacturing method according to any one of claims 4 to 6, the conductive wire has a conductive wire body made of a conductive metal and an insulating film covering the conductive wire body. Before the bonding step, a film removal step is performed to irradiate a lead wire with a laser beam to remove the insulating film, and in the film removal step and the bonding step, a laser beam is emitted using the same laser beam irradiation device. Irradiating an armature.

  If it does in this way, since an insulating film is removed at the film removal process before a joining process, compared with the case where it joins, melt | dissolving an insulating film at a joining process, it can reduce joint defect. Also, in the film removal process and the bonding process, the same laser beam irradiation apparatus is used to irradiate the laser beam. Therefore, compared to the case where different laser beam irradiation apparatuses are used in the film removal process and the bonding process, It is possible to reduce the space and cost of the armature manufacturing apparatus.

1 is a schematic configuration diagram of a motor in the present embodiment. FIG. 3 is a cross-sectional view of a main part of the motor in the present embodiment. The top view of the short circuit member in this Embodiment. (A) Explanatory drawing for demonstrating the armature of this Embodiment expand | deployed planarly. (B) The circuit diagram formed with the coil | winding of the armature of this Embodiment. The top view of the insulator and armature core of the axial direction one end side of this Embodiment. The bottom view of the insulator and armature core of the axial direction other end side of this Embodiment. The principal part expansion perspective view for demonstrating the manufacturing method of the armature in this Embodiment. The principal part expansion perspective view for demonstrating the manufacturing method of the armature in this Embodiment. The principal part expanded sectional view for demonstrating the manufacturing method of the armature in this Embodiment. The principal part expanded bottom view for demonstrating the armature in this Embodiment. The perspective view for demonstrating the armature in this Embodiment. The perspective view for demonstrating the connection part in another example. The perspective view for demonstrating the joining method of the metal in another example. (A)-(d) The top view for demonstrating the through-hole in another example. Sectional drawing for demonstrating the through-hole in another example. Sectional drawing for demonstrating the connection part in another example. The schematic cross section for demonstrating the manufacturing method of the armature in another example.

Explanation of symbols

  1-24 ... Segment, 108 ... Commutator, 116a, 201, 801 ... Connection (first metal member), 116b, 201a, 303, 403, 503, 603, 652, 703, 801b ... Through-hole, 116c, 705, 801c ... 1st opening, 116d, 404, 704, 801d ... 2nd opening, 301, 401, 501, 601, 651 (651a, 651b), 701 ... 1st metal plate (1st (Metal member), 302, 402, 502, 602, 653, 702 ... second metal plate (second metal member), 801a ... curved portion, 802 ... cone (drilling jig), 802a ... reduced diameter portion, D ... conductive wire, LB ... laser beam, Mb ... conductive wire connection part (second metal member), M1 to M8 ... winding.

Claims (6)

A metal joining method for joining a first metal member and a second metal member by laser welding,
A through hole is provided in the first metal member in advance, the first opening of the through hole is disposed so as to be closed with the second metal member, and laser light is emitted from the through hole in the first metal member. A joining step of irradiating at least a part of the periphery of the second opening and irradiating the second metal member through the through hole to join the first metal member and the second metal member. A method for joining metals, comprising: The metal bonding method according to claim 1,
The metal joining method, wherein the through-hole is set such that the second opening is smaller than the first opening. The metal bonding method according to claim 2,
A metal joining method, comprising: a hole forming step of forming the through hole with a drilling jig having a reduced diameter portion that decreases in diameter toward the tip. A method for manufacturing an armature comprising a joining step in the metal joining method according to any one of claims 1 to 3,
The first metal member is a connecting portion extending from a commutator segment,
The method of manufacturing an armature, wherein the second metal member is a part of a conductive wire constituting a winding. In the manufacturing method of the armature of Claim 4,
The connecting part has a curved part along the outer periphery of the conducting wire, and the through hole is provided in the curved part. In the manufacturing method of the armature according to claim 4 or 5,
A method of manufacturing an armature, wherein a plurality of the through holes are provided along the conducting wire.

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