CN104578623A - Motor and punching device unit used for manufacturing motor - Google Patents
Motor and punching device unit used for manufacturing motor Download PDFInfo
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- CN104578623A CN104578623A CN201410541795.7A CN201410541795A CN104578623A CN 104578623 A CN104578623 A CN 104578623A CN 201410541795 A CN201410541795 A CN 201410541795A CN 104578623 A CN104578623 A CN 104578623A
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Abstract
Disclosed are a motor and a punching device unit used for manufacturing the motor so as to prevent decline of connection strength of welding parts when projection welding is carried out on parts which have thinner plate thickness to install a fixing part on the motor. The motor is provided with a motor main body part which includes a rotor and a stator; and the fixing part which is welded on the motor main body part, wherein a first welding material of a first plate thickness on one of the fixing part and the motor main body part is connected with a second welding material of a second plate thickness arranged on the other of the fixing part and the motor main part through projection welding. A wall thickness reduction part is formed on the back of the connection part of the first welding material and the second welding material so that the plate thickness of the thinnest part in the wall thickness reduction part is more than 2/3 of the first plate thickness.
Description
Technical field
The present invention relates to a kind of technology parts forming motor engaged by projection welding, particularly relate to the die cutter unit of motor and manufacture method and motor manufacture.
Background technology
The motors such as stepper motor are being used as in the equipment of drive source, are adopting the fixed parts such as a kind of framework be fixedly made of metal at the parts such as stator and motor shell and by this fixed part, motor be installed on the structure of equipment body.Can be fixed the component parts of fixed part and motor body side by welding.Patent Document 1 discloses a kind of following stepper motor: be formed with multiple projection at the end face of the side towards motor axis direction in motor body portion, projection is contacted with motor mount plate, carry out being energized and welding, thus at end face fixing motor mounting panel.And disclose following content: in this stepper motor, be formed with projection at the end face of the opposite side towards motor axis direction in motor body portion and weld and rigid bearing retainer at this end face.
Patent documentation 1: Japanese Unexamined Patent Publication 2007-89253 publication
The method of the various parts such as retainer and motor mount plate is connect as the end face weld in motor body portion, carry out following projection welding: form projection (projection) at a solder side, this projection is contacted with another solder side, carry out pressurizeing and carry out pulse electrifying with high voltage, thus make two solder side meltings and engage.At this, when carrying out projection welding, if the thickness of slab of weld part is thin, then in weld part melting before engaging by energising, be formed with protruding part pressurized and deform.More particularly, projection outer peripheral portion (utilize die cutter formed projection time thin-walled property part) there is plastic deformation and become fragile.Consequently, the bond strength after welding does not depend on the peel strength of solder side, but depends on the rupture strength of the part that plastic deformation occurs, thus causes bond strength to decline.
Summary of the invention
In view of above problem, problem of the present invention is to prevent when being welded by various parts and being fixed on the end face in motor body portion, and the bond strength of weld part when utilizing the part of projection welding and fish plate thickness declines.
In order to solve above-mentioned problem, the manufacture method of motor of the present invention, described motor comprises: the motor body portion with rotor and stator; And be welded in the fixed part in described motor body portion, the feature of the manufacture method of described motor is, carry out following steps: first step: the side in advance in described fixed part and described motor body portion arranges the first welding material of the first thickness of slab, and the opposing party in described fixed part and described motor body portion arranges the second welding material of the second thickness of slab, form the projection at least partially in convex surface shape at described first welding material, and form recess in the rear side of described projection; And second step: make described projection and described second weld material and contact, by projection welding, fixing described first welding material welds material with described second, in described first step, form described projection with the outer peripheral edges of described projection relative to the mode of the outer peripheral edges outer circumferential side side of the bottom surface of described recess.
So, the present invention, when the first welding material forms the projection of projection welding, will utilize the shape being formed at the recess at the back side of projection during die cutter etc. to be formed as a circle less of projection, and the surface of projection is formed as convex surface shape.By this shape, the bossed part of formation in the first welding material can be prevented by local thin wall, thus stress can be avoided to concentrate.Therefore, it is possible to prevent from causing weld part that plastic deformation occurs before melting because of pressurization during projection welding, thus can prevent the bond strength of weld part from declining.
At this, the manufacture method of motor of the present invention is preferably applied to the first thickness of slab and is more than 0.15mm and the situation of below 0.3mm.Such as, the first thickness of slab is 0.2mm.Due to when the original thickness of slab of welded parts is larger, can guarantees the wall thickness at the position being formed with projection and recess, therefore not easily plastic deformation occur, the possibility of the problem that is declined to become of bond strength is lower.But, when original thickness of slab is less, cannot wall thickness be guaranteed, likely cause bond strength to decline.The present invention under the circumstances, even if be set as the shape also can guaranteeing certain wall thickness when thickness of slab is thinner in welding position.Thus, when fixed part being welded in the position of thickness of slab thin than ever, can prevent the bond strength of weld part from declining.
In the manufacture method of motor of the present invention, preferably in described first step, the size described projection is formed as from the outer peripheral edges of the bottom surface of described recess to the outer peripheral edges of described projection be described first thickness of slab more than 1/2 and below described first thickness of slab.The present inventor etc. confirm, and consider that this position is that the concentrated position this point of stress easily occurs, as long as can guarantee the thickness of slab of more than 1/2 of the first thickness of slab at this position, because of pressurization during projection welding, plastic deformation would not occur, and bond strength can not decline.Further, when using die cutter unit, this position can be formed as below original thickness of slab, namely below the first thickness of slab.Therefore, by this structure, can prevent the bond strength of weld part from declining.
Further, in the manufacture method of motor of the present invention, preferably in described first step, described projection being formed as at least top ends is convex spherical shape.By this shape, stress dispersion can be made when pressurizeing, not easily causing stress raisers.
Now, preferably described first welding material comprises the tabular surface of the outer circumferential side being arranged at described projection, and the joint face of described projection and described tabular surface is flexure plane.Form if so, then not easily can cause stress raisers in the outer peripheral edges of projection when pressurizeing.
At this, described second welding material can be arranged at described fixed part, described first welding material be arranged at the housing parts in described motor body portion.In this case, described second thickness of slab can be set to thicker than described first thickness of slab.So, the manufacture method of motor of the present invention can be applied to the thick situation of the thickness of slab of the thickness ratio housing parts of fixed part.
In the manufacture method of motor of the present invention, preferably in described first step, the described bottom surface of described recess is formed flatly, and the inner peripheral surface of described recess is formed as along with from the outer peripheral edges of described bottom surface towards the opening edge of described recess and expanding cone-shaped.So, by the inner peripheral surface of recess is set to taper surface, the profile of the projection of giving prominence to towards the rear side of recess can be strengthened.Therefore, it is possible to prevent wall thickness local thinning, thus not easily can cause stress raisers.
Then, in order to solve above-mentioned problem, the die cutter unit of motor manufacture of the present invention, described die cutter unit is used for the projection forming projection welding at the first welding material of the first thickness of slab, first welding material of described first thickness of slab is arranged at the motor body portion comprising rotor and stator and the side be welded in the fixed part in described motor body portion, the feature of the die cutter unit of described motor manufacture is, described die cutter unit comprises: the first mould, and described first mould is formed with die-cut shapes portion; And second mould, described second mould is formed with the mould shape portion corresponding with described die-cut shapes portion, and the internal diameter of described mould shape portion is larger than the diameter of the terminal surface in described die-cut shapes portion.
So, the present invention is the die cutter unit comprising die-cut shapes portion and mould shape portion, and described die cutter unit, when the first welding material forms the projection of projection welding, makes the bossed part of formation be out of shape in the mode of not local thin wall.By utilizing this die cutter unit to form projection, the wall thickness local forming bossed part can be prevented thinning.Therefore, it is possible to prevent from causing weld part before melting plastic deformation to occur because of pressurization during projection welding.Therefore, it is possible to prevent the bond strength of weld part from declining.
In die cutter unit of the present invention, preferred described die-cut shapes portion comprises the outer peripheral face from described terminal surface towards the expanding cone-shaped of radial outside.By utilizing this die-cut shapes portion, the profile of the projection of giving prominence to towards the rear side of recess can be strengthened.Therefore, it is possible to prevent wall thickness local thinning, thus not easily can cause stress raisers.
And, in the present invention, preferred described die-cut shapes portion comprises columned main part and is arranged at the tapered portion of end of described main part, described tapered portion is provided with taper surface and described terminal surface, described taper surface is in the shape on the top of cut-out taper seat, and described terminal surface is formed as smooth circle at the end of described taper surface.
Further, in the present invention, the diameter of preferred described terminal surface is 0.2mm.Further, preferred described taper surface tilts with 45° angle degree relative to the central axis of described main part.
Further, in order to solve above-mentioned problem, motor of the present invention comprises: the motor body portion with rotor and stator; And be welded in the fixed part in described motor body portion, the feature of described motor is, be arranged at second of second thickness of slab of first welding material and the opposing party be arranged in described fixed part and described motor body portion of first thickness of slab of the side in described fixed part and described motor body portion to weld material and engaged by projection welding, be formed with wall thickness reducing portion at described first welding material with described second back side of welding the junction surface that material engages, the thickness of slab of the most thin section in described wall thickness reducing portion is more than 2/3 of described first thickness of slab.
So, in motor of the present invention, although the vestige being formed with the part of the projection of projection welding remains as wall thickness reducing portion after being welded, the thickness of this wall thickness reducing portion is more than 2/3 of the thickness of slab before welding.The present inventor etc. confirm by the position of the projection being formed with projection welding being set as the shape that local thin wall does not occur, and can retain the thickness of this degree, and bond strength can not decline.Therefore, by this structure, can prevent the bond strength of weld part from declining.
At this, motor of the present invention preferably described first thickness of slab is more than 0.15mm and below 0.3mm.Such as, the first thickness of slab is 0.2mm.As mentioned above, when being more than 0.15mm to thickness of slab and the parts of below 0.3mm carry out projection welding, the possibility producing bond strength decline is large.Even if the present invention is when thickness of slab is thinner, also can guarantee certain wall thickness in welding position, thus can prevent the bond strength of weld part from declining.Thus, when fixed part being welded in the position of thickness of slab thin than ever, can prevent the bond strength of weld part from declining.
Further, in motor of the present invention, the housing parts in described motor body portion comprises the weld part be made up of described first welding material, is formed with the projection of projection welding at described weld part.In such an embodiment, when various fixed part being fixed on housing parts by projection welding, can preventing the bond strength of weld part from declining, thus can prevent fixed part from coming off.Further, in this case, described second thickness of slab can be set to thicker than described first thickness of slab.So, the present invention can be applied to the thick situation of the thickness of slab of the thickness ratio housing parts of fixed part.
Further, in the present invention, described in the thickness ratio of the most thin section preferably in described wall thickness reducing portion, the first thickness of slab is thin.And, in the present invention, preferably described first thickness of slab is not formed with the thickness of the part of the projection of projection welding in described first welding material, and the thickness of slab of the most thin section in described wall thickness reducing portion is the thickness being formed with the part of the projection of described projection welding in described first welding material.
The effect sent out
According to the present invention, when the first welding material forms the projection of projection welding, can prevent from forming bossed part local thin wall, thus can prevent from causing weld part before melting plastic deformation to occur because of pressurization during projection welding.Therefore, it is possible to prevent the bond strength of weld part from declining.
Accompanying drawing explanation
Fig. 1 is the outside drawing of the motor involved by embodiments of the present invention.
Fig. 2 is the key diagram of the cross section structure of the motor that Fig. 1 is schematically shown.
Fig. 3 (a) ~ Fig. 3 (d) is the key diagram that outlet side housing parts is shown with monomer.
Fig. 4 is the key diagram of the cross sectional shape of the recess at the back side of projection and this projection die cutter unit being schematically shown and utilizing this die cutter unit to be formed.
Fig. 5 (a) ~ Fig. 5 (d) is the key diagram of the cross section structure that the junction surface formed by projection welding is schematically shown.
Fig. 6 is the key diagram of the cross sectional shape of the recess that the projection of other execution modes and the back side of this projection are schematically shown.
(symbol description)
1 motor;
1a motor body portion;
1b fixed part;
2 rotors;
3 stator body portions;
3B outlet side stator;
3A exports opposition side stator;
4 motor shells;
4B outlet side housing parts;
4A exports opposition side housing parts;
5 bearing portions;
5B outlet side bearing portion;
5A exports opposition side bearing portion;
6 stators;
11 fixed parts;
12 installation portions;
13 bearing cages;
21 rotating shafts;
22 rotor magnets;
31 rotor configuration holes;
32 coils;
33 drum stands;
33a cylindrical portion;
33b flange part;
33c flange part;
34 inner-stator iron cores;
34a annular portion;
34b pole tooth;
35 external stator cores;
35a annular portion;
35b pole tooth;
36 distribution connecting portions;
41 base plate;
41a circular open portion;
41b first limit;
41c Second Edge;
41d the 3rd limit;
41e the 4th limit;
42 cylindrical portion;
42a notch part;
42b first planar section;
42c second planar section;
42d first sweep;
42e second sweep;
43 junction surfaces;
44 wall thickness reducing portion;
45 back sides;
51 retainers;
51a Bearing configuration hole;
52 parts of bearings;
53 steel balls;
54 force application parts;
54a plate-like portion;
54b plate spring part;
54c hook portion;
55 parts of bearings;
56 steel balls;
60,60a to 60d projection;
61 convex spherical;
62 tabular surfaces;
70 recesses;
71 bottom surfaces;
72 inner peripheral surfaces;
73 tabular surfaces;
80 die cutter unit;
81 die-cut shapes portions;
81A main part;
81B tapered portion;
81a taper surface;
81b terminal surface;
82 first moulds;
83 mould shape portion;
84 second moulds;
100 first welding materials;
160 projections;
161 convex spherical;
163 joint faces;
170 recesses;
171 bottom surfaces;
172 inner peripheral surfaces;
173 joint faces;
200 second welding materials;
243 junction surfaces;
244 wall thickness reducing portion;
260 projections;
270 recesses;
A, A1 outer peripheral edges;
B, B1 outer peripheral edges;
L motor axis;
L1 outlet side;
L2 exports opposition side.
Embodiment
Below, be described applying motor of the present invention with reference to accompanying drawing.In the following description, the side that the output shaft (rotating shaft) of motor is outstanding along motor axis L direction is set to outlet side L1, is set to the side contrary with outlet side and exports opposition side L2.Fig. 1 is the outside drawing of the motor involved by embodiments of the present invention, and Fig. 2 is the key diagram of the cross section structure of the motor that Fig. 1 is schematically shown.Motor 1 is the stepper motor for various electronic equipment.Motor 1 comprises: the motor body portion 1a comprising rotor 2 and stator 6; Be welded in the fixed part 1b be made of metal of motor body portion 1a; And be installed on the bearing portion 5 of motor body portion 1a and fixed part 1b.Rotor 2 supports as rotating by bearing portion 5.Further, fixed part 1b is the framework of installation motor 1 being installed on equipment body.
(motor body portion)
Motor body portion 1a comprises rotor 2 and stator 6, and described rotor 2 is connected with rotor magnet 22 at rotating shaft 21, and described stator 6 is configured in the outer circumferential side of described rotor 2.Stator 6 forms by the stator body portion 3 of the tubular being formed with rotor configuration hole 31 is contained in motor shell 4.Rotor magnet 22 is fixed in the rotating shaft 21 extended along motor axis L direction.Rotor magnet 22 to magnetize in the mode be circumferentially alternately arranged at outer peripheral face and S pole and N pole.The end side being configured with rotor magnet 22 of rotor 2 configures coaxially with the rotor configuration hole 31 being formed at stator body portion 3.Another side of rotating shaft 21 is given prominence to from motor shell 4, and exposes to the outside of motor shell 4.Spiral helicine thread groove is formed at the outer peripheral face of the part outstanding from motor shell 4 of rotating shaft 21.
As shown in Figure 2, stator body portion 3 comprises these two groups of stator pack of output opposition side stator pack 3A and outlet side stator pack 3B.Export opposition side stator pack 3A and outlet side stator pack 3B to include: winding spiral and the coil 32 that forms; Become the drum stand 33 of the core of coil 32; And be configured in the inner-stator iron core 34 of both sides in motor axis L direction and the external stator core 35 of drum stand 33.Drum stand 33 comprises: the cylindrical portion 33a being wound with coil 32; And be arranged on pair of flanges portion 33b, the 33c at both ends in motor axis L direction of cylindrical portion 33a.
Inner-stator iron core 34 comprises: the flange shape annular portion 34a overlapping with a flange part 33b of drum stand 33; And from the inner peripheral of this annular portion 34a to motor axis L direction bending multiple pole tooth 34b.Further, external stator core 35 comprises: the annular portion 35a overlapping with another flange part 33c; And from the inner peripheral of this annular portion 35a to motor axis L direction bending multiple pole tooth 35b.The pole tooth 34b of the inner-stator iron core 34 and pole tooth 35b of external stator core 35 alternately configures along the inner peripheral surface of drum stand 33 in circumference.The outer peripheral face of pole tooth 34b, 35b and rotor magnet 22 is at diametrically contraposition.
Output opposition side stator pack 3A is positioned at the end face exporting opposition side L2 mode with the annular portion 35a of external stator core 35 configures, and outlet side stator pack 3B is positioned at the end face of outlet side L1 mode with the annular portion 35a of external stator core 35 configures.Export opposition side stator pack 3A to fix by making to abut along motor axis L direction between the annular portion 34a of inner-stator iron core 34 with outlet side stator pack 3B, the overall stator body portion 3 forming tubular.
Motor shell 4 comprises: cover the output opposition side housing parts 4A exporting opposition side stator pack 3A; And cover the outlet side housing parts 4B of outlet side stator pack 3B.Export opposition side housing parts 4A and outlet side housing parts 4B to be made of metal, except the projection with or without aftermentioned projection welding, in identical shape.Export opposition side housing parts 4A and outlet side housing parts 4B all in drum with the end, and comprise: the base plate 41 overlapping with the annular portion 35a of external stator core 35; And from the cylindrical portion 42 that the outer peripheral edges of base plate 41 extend along motor axis L direction.As shown in Figure 2, circular open portion 41a is formed with in the central authorities of base plate 41.Further, as shown in Figure 1, the notch part 42a of configuration terminal board 36 is formed in cylindrical portion 42.
Export opposition side housing parts 4A and outlet side housing parts 4B reverse configuration on motor axis L direction, and fix with the state abutted along motor axis L direction between the end face of cylindrical portion 42.In this condition, be formed with the peristome formed by notch part 42a in the side of motor shell 4, be configured with the terminal board 36 connected for the distribution be connected with the coil 32 in stator body portion 3 at this peristome.
(bearing portion)
Bearing portion 5 comprises: the output opposition side bearing portion 5A being supported in the output opposition side housing parts 4A of motor body portion 1a; And be supported in the outlet side bearing portion 5B of fixed part 1b.Export opposition side bearing portion 5A to comprise: the retainer 51 being fixed on the surface of the output opposition side L2 of the base plate 41 exporting opposition side housing parts 4A; Supported as can along the discoideus parts of bearings 52 of motor axis L direction movement by retainer 51; Be held in the steel ball 53 of parts of bearings 52; And by force application part 54 that parts of bearings 52 exerts a force towards outlet side L1.Be formed with circular Bearing configuration hole 51a at retainer 51, in this Bearing configuration hole, 51a is provided with parts of bearings 52.Force application part 54 comprises: the plate-like portion 54a being configured at the output opposition side L2 of parts of bearings 52; From the plate spring part 54b that plate-like portion 54a digs to outlet side L1; And plate-like portion 54a is fixed on the hook portion 54c of retainer 51.Plate spring part 54b abuts with parts of bearings 52, is exerted a force by rotor 2 by described parts of bearings 52 towards outlet side L1.
Outlet side bearing portion 5B comprises: the parts of bearings 55 configured coaxially with parts of bearings 52; And be held in the steel ball 56 of parts of bearings 55.The parts of bearings 55 of outlet side L1 by steel ball 56 by the end bearing of the outlet side L1 of rotating shaft 21 for rotating.Further, export the parts of bearings 52 of opposition side L2 by steel ball 53 by the end bearing of the output opposition side L2 of rotating shaft 21 for rotating.
(fixed part)
Fixed part 1b comprises: the flat fixed part 11 configured in the mode overlapping with the base plate 41 of outlet side housing parts 4B; From the installation portion 12 that the outer peripheral edges of fixed part 11 extend along motor axis L direction; And from the end of installation portion 12 to the bearing cage 13 that the end side of rotating shaft 21 extends.The parts of bearings 55 of above-mentioned outlet side bearing portion 5B is installed at bearing cage 13.
(formation of projection welding projection)
Fixed part 1b is fixed on the surface of the outlet side L1 of the base plate 41 of outlet side housing parts 4B by projection welding.At this, the situation of the projection 60 forming projection welding at outlet side housing parts 4B is described.Fig. 3 (a) ~ Fig. 3 (d) is the key diagram that outlet side housing parts 4B is shown with monomer, Fig. 3 (a) is the upward view from exporting opposition side L2 observation outlet side housing parts 4B, Fig. 3 (b) is the X-X cutaway view of Fig. 3 (a), and Fig. 3 (c), Fig. 3 (d) are the end views of outlet side housing parts 4B.As shown in Fig. 3 (a), the shape that base plate 41 is surrounded in the 3rd limit 41d and the 4th limit 41e by the first limit 41b extended substantially in parallel across circular open portion 41a and Second Edge 41c, arc-shaped between the end connecting the first limit 41b and the end of Second Edge 41c.3rd limit 41d and the 4th limit 41e with the center of circular open portion 41a for benchmark is formed symmetrically in circumference.
The cylindrical portion 42 of outlet side housing parts 4B comprises: respectively from the first limit 41b, Second Edge 41c to the first planar section 42b and the second planar section 42c that export opposition side L2 extension; And the first sweep 42d extended from the 3rd limit 41d, the 4th limit 41e of arc-shaped to output opposition side L2 respectively and the second sweep 42e.The notch part 42a of the above-mentioned terminal board 36 of configuration is formed at the edge of the output opposition side L2 of the first sweep 42d.Further, in these three faces of the second sweep 42e, the first planar section 42b and the second planar section 42c, otch 42f is formed with at the edge of the output opposition side L2 in each face.Otch 42f is used for stator body portion 3 (inner-stator iron core 34) to be positioned outlet side housing parts 4B.
In the projection 60 of the projection welding that the surface (tabular surface 62 described later) that the base plate 41 of outlet side housing parts 4B is formed with the outlet side L1 from this base plate 41 is given prominence to.Projection 60 is formed with altogether four: be formed at projection 60a, the 60b between circular open portion 41a and the first sweep 42d; And the projection 60c, the 60d that are formed between circular open portion 41a and the second sweep 42e.Projection 60a, 60b and projection 60c, 60d with the center of circular open portion 41a for benchmark configures symmetrically in circumference.In addition, the quantity of projection 60 and forming position may not be this mode, suitably can change according to the shape of the fixed part 11 of the shape of base plate 41, fixed part 1b and required intensity etc.
In the manner, the steel that the base plate 41 of outlet side housing parts 4B is 0.2mm by thickness of slab are formed, and the steel that the fixed part 11 being welded in the fixed part 1b of base plate 41 is 0.3mm by thickness of slab are formed.At this, the thickness of slab t1 (with reference to figure 2, Fig. 5 (a), Fig. 5 (b)) of base plate 41 can be set to more than 0.15mm and value in below 0.3mm scope.Further, the thickness of slab t4 (with reference to figure 2, Fig. 5 (a), Fig. 5 (b)) of fixed part 11 also can be the value of more than 0.3mm.Base plate 41 and fixed part 11 form the first welding material, the second welding material that are engaged by projection welding.In this manual, for simplicity the side of the projection 60 forming projection welding is set to the first welding material, the side abutted with projection 60 is set to the second welding material.In the manner, the base plate 41 of outlet side housing parts 4B is the first welding material, and the fixed part 11 of fixed part 1b is the second welding material.Further, the thickness of slab t1 of base plate 41 is first thicknesss of slab, and the thickness of slab t4 of fixed part 11 is second thicknesss of slab.As described later, in fixed part 11 (the second welding material) projection welding when base plate 41 (the first welding material), be formed with two welding material meltings in the position at four positions being provided with projection 60 and the junction surfaces 43 (with reference to figure 5 (b)) engaged.
Fig. 4 is the key diagram of the cross sectional shape of the recess 70 at the projection 60 of projection welding die cutter unit being schematically shown and utilizing this die cutter unit to be formed and the back side of this projection 60.The projection 60 being formed at base plate 41 utilizes die cutter unit 80 to be formed.Die cutter unit 80 by the first mould 82 comprising die-cut shapes portion 81 and the second mould 84 of comprising the mould shape portion 83 paired with this die-cut shapes portion 81 with make die-cut shapes portion 81 opposed with mould shape portion 83 and make die-cut shapes portion 81 and mould shape portion 83 can near and the state that is separated keep.Die-cut shapes portion 81 comprises columned main part 81A and is arranged at the tapered portion 81B of end of main part 81A.Tapered portion 81B is provided with taper surface 81a and terminal surface 81b, and described taper surface 81a is in the shape on the top of cut-out taper seat, and described terminal surface 81b is formed as smooth circle at the end of taper surface 81a.Specifically be of a size of as follows: the diameter d 1 of main part 81A is 0.5mm, and the diameter d 2 of terminal surface 81b is 0.2mm.Further, taper surface 81a relative to the central axis of main part 81A with the angular slope of 45 degree.Mould shape portion 83 is in the shape such as the recess of circle more large-scale than die-cut shape portion 81 or the breakthrough part of circle.The internal diameter d3 of mould shape portion 83 is larger than the diameter d 2 of the terminal surface 81b of die-cut shape portion.
As shown in Figure 4, projection 60 is that the surface of projection 60 becomes convex spherical 61 from the surface of the outlet side L1 of base plate 41 convex form outstanding to outlet side L1 further.The outer peripheral edges A of projection 60 is connected with the tabular surface 62 surrounding projection 60.Tabular surface 62 is surfaces of the outlet side L1 of base plate 41.The outer peripheral edges A of projection 60 becomes the shape of mould shape portion 83 regulation of punched device unit 80.
On the other hand, on the surface of the output opposition side L2 of base plate 41, recess 70 is formed with in the rear side of projection 60.Recess 70 is in the shape corresponding with the die-cut shapes portion 81 of the first mould 82, and recess 70 comprises: the smooth and bottom surface 71 of circle; And from the inner peripheral surface 72 that the outer peripheral edges B of bottom surface 71 extends to output opposition side L2.Inner peripheral surface 72 is that inner peripheral surface 72 is connected with the tabular surface 73 surrounding recess 70 along with the inclined plane of expanding cone-shaped from the outer peripheral edges B of bottom surface 71 towards the opening edge of recess 70.Tabular surface 73 is surfaces of the output opposition side L2 of base plate 41.The diameter D1 of the bottom surface 71 of recess 70 is less than the diameter D2 of projection 60, projection 60 (part outstanding to outlet side L1 towards the surface and tabular surface 73 that export opposition side L2 from the base plate 41) shape in a circle larger than bottom surface 71.When observing from motor axis L direction, projection 60 and recess 70 configure coaxially.Therefore, the outer peripheral edges B outer circumferential side side of outer peripheral edges A in all positions of circumference all than bottom surface 71 of projection 60.
In the manner, the thickness of slab t1 (the first thickness of slab) being formed with the base plate 41 of projection 60 is 0.2mm.When thickness of slab t1 is 0.2mm, by being pressed in base plate 41 by die-cut shapes portion 81 with the size of regulation, form the recess 70 that opening footpath is 0.44mm.At this, in the position being formed with projection 60 and recess 70, the cross sectional shape of base plate 41 is as follows: at output opposition side L2, bottom surface 71 forms the bight of concavity with the coupling part of inner peripheral surface 72 at the outer peripheral edges B place of bottom surface 71; At outlet side L1, convex spherical 61 forms the bight of concavity with the coupling part of tabular surface 62 at the outer peripheral edges A place of projection 60.In the manner, the thickness of slab t2 (that is, from the size of the outer peripheral edges B to the outer peripheral edges A of projection 60 of the bottom surface 71 of recess 70) of this part becomes the minimum value of the thickness of slab of the base plate after Punching Technology 41.Specifically, in base plate 41, about the thickness of slab of part of projection 60 (recess 70) being formed with projection welding, when the thickness of slab t1 of the base plate 41 before Punching Technology is 0.2mm, thickness of slab t2 becomes about 0.14mm.Further, in the base plate 41 after Punching Technology, the thickness of slab not being formed with the part of projection 60 (recess 70) is identical with before processing, i.e. 0.2mm.The present inventor etc. confirm after utilizing the steel of various thickness of slab to test, as long as the thickness of slab t1 forming the base plate 41 before the projection 60 of projection welding is more than 0.15mm and the scope of below 0.3mm, the thickness of slab t2 of the part of the projection 60 (recess 70) being formed with projection welding in the base plate 41 after Punching Technology will become thickness of slab t1 before the projection 60 (recess 70) forming projection welding more than 1/2 and the size of below thickness of slab t1 (that is, t1 >=t2 >=1/2t1).
(utilize projection welding and manufacture the method for motor 1)
In the manner, when manufacture comprises the motor 1 of fixed part 1b, parts 1b is welded and fixed to motor body portion 1a by the order of following (1), (2), specifically, parts 1b is welded and fixed by the order of following (1), (2) to outlet side housing parts 4B.As prerequisite, as mentioned above, using the welding material (first welding material) of the base plate 41 of outlet side housing parts 4B as 1a side, motor body portion, and prepare the fixed part 1b comprising the fixed part 11 (second welds material) that can abut with the welding material of 1a side, motor body portion.
(1) four positions of the encirclement circular open portion 41a of die cutter unit 80 in base plate 41 first, in a first step, are utilized to form the projection 60 of projection welding.Specifically, base plate 41 is positioned the mould shape portion 83 of the second mould 84, by the die-cut shapes portion 81 of the first mould 82 towards under the state of base plate 41, make the first mould 82 relative close with the second mould 84, formed projection 60.Now, form the recess 70 formed by die-cut shapes portion 81 in base plate 41, consequently, the rear side of recess 70 is given prominence to towards outlet side L1 in the region specified by mould shape portion 83, while mould shape portion 83 limit shape, form the projection 60 of shape described above.
(2) projection welding of portion 11 and base plate 41 then, in the second step, is fixed.Specifically, the mode contacted with four projections 60 on surface of the outlet side L1 being formed at base plate 41 with the surface of the output opposition side L2 of fixed part 11, is positioned by fixed part 1b for outlet side housing parts 4B.Further, pressurizeed in the position at four positions that fixed part 11 contacts with projection 60 respectively with the pressure of regulation, while carry out pulse electrifying with the voltage pair electrode be connected with pressing position of regulation.Thus, make fixed part 11 be formed with four position meltings of projection 60 with base plate 41 and engage, form junction surface 43.
(cross section structure at the junction surface formed by projection welding)
Fig. 5 (a) ~ Fig. 5 (d) is the key diagram of the cross section structure that the junction of implementing before and after projection welding is schematically shown.Fig. 5 (a), Fig. 5 (b) are the junctions formed by the projection welding of the manner, Fig. 5 (a) joint is shown before cross section structure, Fig. 5 (b) joint is shown after cross section structure.And, Fig. 5 (c), Fig. 5 (d) are as the junction formed by projection welding in the past shown in comparative example, Fig. 5 (c) joint is shown before cross section structure, Fig. 5 (d) joint is shown after cross section structure.As shown in Fig. 5 (a), be formed with projection 60 and recess 70 in the base plate 41 as the first welding material.As shown in Fig. 5 (a), when implementing projection welding, projection 60 contacts with fixed part 11 and pressurized.Carry out the result of pulse electrifying while pressurization, as shown in Fig. 5 (b), welding position melting is also out of shape and forms junction surface 43.
As shown in Fig. 5 (b), after being welded, the wall thickness reducing portion 44 of the retention shape as projection 60 and recess 70 is formed in the base plate 41 as the first welding material.Namely, the part at the back side 45 (position surrounded by above-mentioned tabular surface 73 on the surface of the output opposition side L2 of base plate 41) being arranged in the rear side at junction surface 43 in base plate 41 is slightly to side, junction surface 43 depression, and this position becomes wall thickness reducing portion 44.Wall thickness reducing portion 44 is formed as ring-type along the outer peripheral edges of the recess 70 formed before welding.
As mentioned above, in the manner, the thickness of slab t1 not being formed with the position of projection 60 is 0.2mm, but this value can be set to more than 0.15mm and the scope of below 0.3mm.On the other hand, the thickness of slab t4 as the fixed part 11 of the second welding material is 0.3mm, but also can be the thickness of slab of more than 0.3mm.The present inventor etc. confirm after utilizing the steel of various thickness of slab to test, thickness of slab t1 before the Punching Technology of base plate 41 be more than 0.15mm and below 0.3mm time, the thickness of slab t3 of the most thin section in wall thickness reducing portion 44 become Punching Technology before more than 2/3 (that is, the t3 >=2/3t1) of thickness of slab t1.And, confirm after strength test is carried out to the junction surface 43 after projection welding, thickness of slab t1 before to be in the thickness of slab t3 as the most thin section in wall thickness reducing portion 44 be Punching Technology more than 2/3 deformation state time, base plate 41 is not easily broken along wall thickness reducing portion 44, and bond strength depends on the peel strength that base plate 41 is peeled off from fixed part 11.In other words, confirm can suppress because of pressurization time plastic deformation and cause intensity to decline.
On the other hand, in projection welding in the past, the shape of projection and recess is as shown in Fig. 5 (c).Namely, projection 260 is formed at the first welding material 100 by Punching Technology, recess 270 is formed in the rear side of projection 260, but in the past adopted shape, the outer peripheral edges B1 of the bottom surface of recess 270 is positioned at roughly overlapping position with the outer peripheral edges A1 of projection 260, or the outer peripheral edges A1 of projection 260 than the outer peripheral edges B1 of the bottom surface of recess 270 slightly by inner circumferential side.Further, the shape near the summit of projection 260 is convex surface shape, and in the drum that the surface from the first welding material 100 generally perpendicularly erects near outer peripheral edges A1.Further, the inner peripheral surface of recess 270 is not taper surface, but the barrel surface be generally perpendicularly connected with the bottom surface of recess 270.Therefore, in the first welding material 100, between the outer peripheral edges B1 of the outer peripheral edges A1 of projection 260 and the bottom surface of recess 270, the local of the thickness of slab of part is thinning.Specifically, when by first welding material 100 thickness of slab t10 identical with the manner be set to 0.2mm, from the size t20 of the outer peripheral edges B1 to the outer peripheral edges A1 of projection 260 of the bottom surface of recess 270 (that is, becoming the thickness of slab of the thinnest part after Punching Technology) obviously than thickness of slab t10 1/2 little of the first welding material 100 before Punching Technology.Further, when first welding material 100 thickness of slab t10 be more than 0.15mm and the scope of below 0.3mm also identical.
As shown in Fig. 5 (c), when carrying out projection welding, making projection 260 and second weld material 200 and contact and pressurize.Carry out the result of pulse electrifying while pressurization, as shown in Fig. 5 (d), welding position melting is also out of shape and forms junction surface 243.Identical with the manner, when by first welding material 100 thickness of slab t10 be set to more than 0.15mm and in the scope of below 0.3mm, be preferably set to 0.2mm and by second welding material 200 thickness of slab t40 be set to more than 0.3mm, if carry out projection welding by shape for lugs in the past, then after welding first welding material 100 formed as shown in Fig. 5 (d) partial-depth cave in wall thickness reducing portion 244.That is, the wall thickness reducing portion 244 to side, junction surface 243 partial-depth depression is formed in the form of a ring along the outer peripheral edges of recess 270 formed before welding.Specifically, the thickness of slab t30 confirming the most thin section in wall thickness reducing portion 244 is obviously than thickness of slab t10 2/3 little of the first welding material 100 before Punching Technology.
So, in the projection welding of projection welding in the past and the manner, the form being formed at the wall thickness reducing portion 44,244 of welding position differs widely.The wall thickness reducing portion 44 of the manner is more shallow recess, and wall thickness reducing portion 244 partial-depth depression in the past.Further, confirm following content: if carry out strength test to welding position in the past, then the first welding material 100 broke in the form of a ring along wall thickness reducing portion 244 before junction surface 243 is stripped, and its result causes bond strength to decline.
(main efficacy results of the manner)
As mentioned above, in the manner, when fixed part 1b being fixed on the motor body portion 1a comprising rotor 2 and stator 6, arrange fixed part 11 at fixed part 1b, the base plate 41 that the thickness of slab of the thickness ratio fixed part 11 of the outlet side housing parts 4B in motor body portion 1a is thin forms the projection 60 of projection welding.Then, projection welding is carried out to fixed part 11 and base plate 41.Now, by utilizing die cutter unit 80 to form recess 70 and projection 60, even if when the thickness ratio of base plate 41 is in the past thin, also projection 60 can be formed as the convex spherical shape of a circle larger than bottom surface 71.Specifically, make the outer peripheral edges A of projection 60 in all positions of circumference the outer peripheral edges B outer circumferential side side than the bottom surface 71 of recess 70.Die cutter unit 80 is the structures that base plate 41 Punching Technology can be become this shape.Thereby, it is possible to prevent the part local thin wall being formed with projection 60 in base plate 41, thus stress can be avoided to concentrate.Therefore, it is possible to prevent from causing weld part that plastic deformation occurs before melting because of pressurization during projection welding, thus can prevent the bond strength of weld part from declining.
Further, in the manner, the thickness of slab of base plate 41 of parts of side as the projection 60 forming projection welding be more than 0.15mm and below 0.3mm time, structure carries out projection welding as described above.Then, using the thickness of slab at the position that the easy generation stress in base plate 41 is concentrated, namely in the manner as the mode becoming more than 1/2 of original thickness of slab t1 from the outer peripheral edges B of bottom surface 71 to the thickness of slab t2 of the size of the outer peripheral edges A of projection 60, form projection 60 and recess 70.Further, utilizing die cutter unit 80 to carry out adding man-hour, thickness of slab t2 is roughly below the thickness of slab t1 before Punching Technology.The present inventor etc. confirm, as long as can guarantee this thickness of slab, because of pressurization during projection welding, plastic deformation would not occur, and bond strength can not decline.Further, by projection 60 is set to convex spherical shape, and the inner peripheral surface 72 of recess 70 is set to taper surface, more not easily causes stress to concentrate.
Further, as the form after welding, the thickness of slab t3 of the wall thickness reducing portion 44 of the retention shape after as the welding of projection 60 and recess 70 is made to become more than 2/3 of original thickness of slab t1.The present inventor etc. confirm, and when forming projection 60 and the recess 70 of shape described above, result can guarantee this thickness of slab t3 after carrying out projection welding.Further, when confirming the form after realizing this welding, bond strength does not depend on the rupture strength of wall thickness reducing portion 44, but bond strength depends on the peel strength of solder side.That is, confirm and not easily cause intensity to decline because of plastic deformation during pressurization.
(other execution modes)
(1) Fig. 6 is the key diagram of the cross sectional shape of the recess 170 at the back side that projection 160 in other execution modes and this projection 160 are schematically shown.In aforesaid way, about the cross sectional shape of base plate 41, at output opposition side L2, be formed with the bight of concavity at the outer peripheral edges B place of bottom surface 71, at outlet side L1, be formed with the bight of concavity at the outer peripheral edges A place of projection 60.These bights are set to the flexure plane of concavity by the manner.As shown in Figure 6, the connecting portion 163 between tabular surface 62 is formed with in the outer peripheral edges of projection 160.Connecting portion 163 is flexure planes of concavity, and connecting portion 163 is connected smoothly with tabular surface 62 and as the convex spherical 161 on the surface of projection 160.Further, the bottom surface 171 in recess 170 and the joint face 173 of inner peripheral surface 172 are flexure planes of concavity, and joint face 173 is connected smoothly with bottom surface 171 and inner peripheral surface 172.So, by bight being set to the flexure plane of concavity, stress can be more not easily caused to concentrate.Therefore, it is possible to prevent the bond strength of weld part from declining.
(2) in aforesaid way, the global shape of projection 60 is convex spherical shapes, as long as but at least the top ends of projection 60 are convex spherical shapes.Further, the global shape of projection 60 both can have been made to be other convex surface shapes, the top ends of projection 60 also can be only had to be other convex surface shapes.
(3) aforesaid way forms projection 60 at the outlet side housing parts 4B of motor body portion 1a and has carried out projection welding to fixed part 1b, but also can form projection 60 in fixed part 1b side and carry out projection welding.Further, the position of applying this welding method is not limited to fixed part 1b (installation frame) and the welding position of outlet side housing parts 4B, can also be applied to other positions.Such as, fixed part also can be the end plate being welded in the end face in stator body portion 3 or the end face of motor shell 4, and the present invention can be applied to the welding position in end plate and stator body portion 3 or the welding position of end plate and motor shell 4.Or fixed part also can be retainer 51, the present invention can also be applied to the welding position of retainer 51 with motor shell 4 or the welding position in retainer 51 and stator body portion 3.
(4) aforesaid way applies the present invention to the motor 1 of the stator 6 comprising motor shell 4 and have inner-stator iron core 34 and external stator core 35, but the present invention can also be applied to the motor that external stator core 35 doubles as the mode of motor shell 4 (exporting opposition side housing parts 4A, outlet side housing parts 4B).Such as, the thickness of slab of the external stator core 35 doubling as motor shell can be set to more than 0.15mm and below 0.3mm, and end face in the motor axis L direction of this external stator core 35 forms the projection 60 of projection welding with above-mentioned form, and by projection welding by various part bonding in this external stator core 35.
(5) the invention is not restricted to stepper motor, also can be applied to by the motor of projection welding to other kinds that the parts forming motor engage.
Claims (19)
1. a manufacture method for motor, described motor comprises: the motor body portion with rotor and stator; And be welded in the fixed part in described motor body portion, the feature of the manufacture method of described motor is, carries out following steps:
First step: the side in advance in described fixed part and described motor body portion arranges the first welding material of the first thickness of slab, and the opposing party in described fixed part and described motor body portion arranges the second welding material of the second thickness of slab,
Form the projection at least partially in convex surface shape at described first welding material, and form recess in the rear side of described projection; And
Second step: make described projection and described second weld material and contact, by projection welding, fixing described first welding material welds material with described second,
In described first step, form described projection with the outer peripheral edges of described projection relative to the mode of the outer peripheral edges outer circumferential side side of the bottom surface of described recess.
2. the manufacture method of motor according to claim 1, is characterized in that,
Described first thickness of slab is more than 0.15mm and below 0.3mm.
3. the manufacture method of motor according to claim 1, is characterized in that,
Described first thickness of slab is 0.2mm.
4. the manufacture method of motor according to claim 1, is characterized in that,
In described first step, the size described projection is formed as from the outer peripheral edges of the bottom surface of described recess to the outer peripheral edges of described projection be described first thickness of slab more than 1/2 and below described first thickness of slab.
5. the manufacture method of motor according to claim 1, is characterized in that,
In described first step, described projection being formed as at least top ends is convex spherical shape.
6. the manufacture method of motor according to claim 1, is characterized in that,
Described second welding material is arranged at described fixed part, and described first welding material is arranged at the housing parts in described motor body portion,
Described in described second thickness ratio, the first thickness of slab is thick.
7. the manufacture method of motor according to claim 1, is characterized in that,
In described first step, the described bottom surface of described recess is formed flatly, and the inner peripheral surface of described recess is formed as along with from the outer peripheral edges of described bottom surface towards the opening edge of described recess and expanding cone-shaped.
8. the die cutter unit of a motor manufacture, described die cutter unit is used for the projection forming projection welding at the first welding material of the first thickness of slab, first welding material of described first thickness of slab is arranged at the motor body portion comprising rotor and stator and the side be welded in the fixed part in described motor body portion, the feature of the die cutter unit of described motor manufacture is
Described die cutter unit comprises:
First mould, described first mould is formed with die-cut shapes portion; And
Second mould, described second mould is formed with the mould shape portion corresponding with described die-cut shapes portion,
The internal diameter of described mould shape portion is larger than the diameter of the terminal surface in described die-cut shapes portion.
9. the die cutter unit of motor manufacture according to claim 8, is characterized in that,
Described die-cut shapes portion comprises the outer peripheral face from described terminal surface to the expanding cone-shaped of radial outside.
10. the die cutter unit of motor manufacture according to claim 8, is characterized in that,
Described die-cut shapes portion comprises columned main part and is arranged at the tapered portion of end of described main part,
Described tapered portion is provided with taper surface and described terminal surface, and described taper surface is in the shape on the top of cut-out taper seat, and described terminal surface is formed as smooth circle at the end of described taper surface.
The die cutter unit of 11. motor manufactures according to claim 8, is characterized in that,
The diameter of described terminal surface is 0.2mm.
The die cutter unit of 12. motor manufactures according to claim 10, is characterized in that,
Described taper surface tilts with 45° angle degree relative to the central axis of described main part.
13. 1 kinds of motors, it comprises: the motor body portion with rotor and stator; And be welded in the fixed part in described motor body portion, the feature of described motor is,
Be arranged at second of second thickness of slab of first welding material and the opposing party be arranged in described fixed part and described motor body portion of first thickness of slab of the side in described fixed part and described motor body portion to weld material and engaged by projection welding,
Described first welding material be formed with wall thickness reducing portion with described second back side of welding the junction surface that material engages,
The thickness of slab of the most thin section in described wall thickness reducing portion is more than 2/3 of described first thickness of slab.
14. motors according to claim 13, is characterized in that,
Described first thickness of slab is more than 0.15mm and below 0.3mm.
15. motors according to claim 13, is characterized in that,
Described first thickness of slab is 0.2mm.
16. motors according to claim 13, is characterized in that,
The housing parts in described motor body portion comprises the weld part be made up of described first welding material,
The projection of projection welding is formed at described weld part.
17. motors according to claim 13, is characterized in that,
Described in described second thickness ratio, the first thickness of slab is thick.
18. motors according to claim 13, is characterized in that,
Described in the thickness ratio of the most thin section in described wall thickness reducing portion, the first thickness of slab is thin.
19. motors according to claim 13, is characterized in that,
Described first thickness of slab is the thickness not being formed with the part of projection welding projection in described first welding material,
The thickness of slab of the most thin section in described wall thickness reducing portion is the thickness being formed with the part of described projection welding projection in described first welding material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013217820A JP2015080391A (en) | 2013-10-18 | 2013-10-18 | Motor and method of manufacturing the same, and punch unit for manufacturing motor |
| JP2013-217820 | 2013-10-18 |
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| CN104578623A true CN104578623A (en) | 2015-04-29 |
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| CN201420592970.0U Expired - Fee Related CN204103716U (en) | 2013-10-18 | 2014-10-14 | The die cutter unit of motor and motor manufacture |
| CN201410541795.7A Pending CN104578623A (en) | 2013-10-18 | 2014-10-14 | Motor and punching device unit used for manufacturing motor |
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| JP2015080391A (en) * | 2013-10-18 | 2015-04-23 | 日本電産サンキョー株式会社 | Motor and method of manufacturing the same, and punch unit for manufacturing motor |
| KR101896983B1 (en) * | 2016-04-29 | 2018-09-11 | 주식회사 엠에스 오토텍 | Projection welding method |
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| CN204103716U (en) | 2015-01-14 |
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Application publication date: 20150429 |