JPH08294252A - Jig for manufacturing stator core of motor - Google Patents

Abstract

PURPOSE: To easily change the direction of stacked steel plates at the time of welding by stacking thin steel plates surely in order when stacking the thin steel plates made in the form of cross section of a stator core. CONSTITUTION: A table 14 is placed, and thereon thin steel plates 112 die-cut in the form of the cross section of a stator are stacked, and thereon a press ring 34 is placed. A spherical washer 34a is made at the press ring, and a spherical washer 42 is arranged in contact with this spherical washer 34a. By a push cap 44, the press ring 34 is pressed through the spherical 42, and pressure is applied to the stacked steel plate 112. Since the seat is spherical, even if the press ring 34 inclines, it can be pressed equally in circumferential direction. Moreover, by providing a balance weight, supporting it rotatably around the shaft of the stacked steel plate 112 and around the shaft orthogonal to this, the work of changing the direction of the stacked steel plates 112 can be changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig used for manufacturing a stator core by laminating and welding a plurality of thin steel plates having a shape equal to the sectional shape of a stator core in the process of manufacturing a motor stator.

[0002]

2. Description of the Related Art A stator that forms a rotating magnetic field in a motor includes a stator core made of a magnetic material and a coil for magnetizing the stator core. This stator core is usually manufactured by punching out thin magnetic steel plates into a shape equal to the sectional shape of the stator core at the time of completion, laminating this to a desired thickness, and welding the outer peripheral portion.

Burrs generated by punching are present in the peripheral edge of the punched steel sheets, and even if the steel sheets are stacked in this state, a gap is formed between the steel sheets. This gap may increase the magnetic resistance and cause the performance of the motor to deteriorate. In order to eliminate this gap, the punched steel plates are stacked, and then a work is performed by applying a predetermined pressure in the stacking direction to crush the flash.

FIG. 4 shows a conventional jig 110 used in the step of laminating and pressing the above-mentioned thin steel plates. Further, FIG. 5 shows a thin steel plate 112 punched into the sectional shape of the stator core. Thin steel plate 112
Is mounted on the mounting surface 114a of the table 114.
The mounting surface 114a has an annular shape corresponding to the shape of the thin steel plate. A frustoconical fixed taper cone 116 is fixed to the table 114 and disposed inside the mounting surface 114a. Further, a shaft 118 is fixedly arranged upward on the table 114.
A screw 118 a is formed at the tip of the No. 8. The central axes of the tapered cone 116 and the shaft 118 are aligned with each other, and this axis is substantially aligned with the axis of the laminated thin steel plates 112.

A collet 120 is arranged so as to contact the inner peripheral surface of the laminated thin steel plates 112. The collet 120 is divided into four in the circumferential direction, and the fixed taper cone 1 is provided on the lower portion of the inner circumference of the collet 120.
An inner taper surface 120a is provided in contact with the 16 taper surfaces 116a. Further, an inner tapered surface 120b is also provided at the upper part of the inner circumference of the collet 120, which is the tapered surface 12 of the moving tapered cone 122 movable along the axis 118.
It is in contact with 2a. Therefore, the moving taper cone 12
When 2 moves downward in the figure, the collet 120 opens to bring the laminated steel plates 112 into contact with each other, correct the misalignment of the laminated steel plates 112, and bring them into a state of being aligned in the axial direction. The movement of the moving collet 122 is performed by tightening the nut 124 screwed to the screw 118a of the shaft 118. That is, a pushing jig (not shown) is interposed between the nut 124 and the taper cone 122, and the axial movement of the nut 124 causes the taper cone 1 to move through the pushing jig.
22.

A key groove 126 is provided at least at one location on the outer circumference of the thin steel plate 112. When the steel plates 112 are stacked, the key groove 126 is aligned with the alignment key 128 so that the circumference of each thin steel plate 112 can be adjusted. The directions are aligned in phase. As a result, the convex portions 130 and the concave portions 132 provided on the inner peripheral surface of the thin steel plate 112 are aligned in the axial direction, and are formed as magnetic poles and slots, respectively.

When the circumferential alignment is completed by the collet 120, the pushing jig is removed and the presser foot 134 is placed on the laminated thin steel plate 112.
Then, the presser foot 134 is tightened by the nut 124 to axially press the laminated thin steel plates 112. By this pressure, the burrs remaining on each of the thin steel plates 134 are crushed, so that the thin steel plates 134 are stacked without a gap. At this time, the distance between the table 114 and the presser foot 134 is measured,
It is determined whether the thin steel plates 112 are stacked to a predetermined thickness, and the thin steel plates 112 are increased or decreased according to the measurement result. Then, in the tightened state, the jig 110 is laid down sideways, and fillet-welding is performed by the welding allowances 136 arranged on the circumference of the laminated steel plates 112 to complete the stator core.

[0008]

The above-mentioned thin steel plate 112 is provided.
The thickness of one sheet is not necessarily uniform in each place of the one sheet, and varies depending on the rolling direction of the thin steel sheet and the habit and burrs during punching. Therefore, the laminated thickness of the laminated thin steel plates 112 may be uneven in the circumferential direction. On the other hand, in the conventional jig, the presser foot 134 is allowed only to move parallel to the axis. Therefore, if the thickness of the laminated thin steel plates 112 is non-uniform in the circumferential direction, there is a problem that when pressure is applied to the thin steel plates 112, the pressure may not be applied evenly and a gap may remain depending on the location. It was

Since the welding is performed with the gap left, the dimension of the finished product does not show unevenness of the laminated thickness, and there is a problem that defective products cannot be extracted or fed back to the previous process. .

When welding laminated steel plates,
It is necessary to work the welded portion upward so that the molten metal does not flow. Therefore, the jig 110 needs to be laid sideways. However, in this laying down work, the total weight of the jig 110 and the steel plate 112 is reduced. There is a problem that it is heavy and burdens the operator.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to uniformly press the laminated steel sheets 112 in the circumferential direction, and the laminated thickness is not uniform. In this case, an object of the present invention is to provide a stator manufacturing jig that can be inspected and that can reduce the load of the work of moving and changing the direction of laminated steel plates such as during welding.

[0012]

In order to achieve the above-mentioned object, a jig for producing a stator core according to the present invention comprises a table on which the thin steel plate is placed and a thin steel plate laminated on the table. More presser, a spherical washer having a concave spherical washer receiving portion on the upper portion and a convex spherical abutting portion abutting the washer receiving portion of the presser and having a curvature substantially the same as the curvature of the washer receiving portion. And press the spherical washer,
It has a laminating jig including a pressing means for pressing the laminated thin steel plates sandwiched by the table and the presser foot.

Further, each of the presser foot and the table is provided with an annular reference surface having a diameter larger than the outer diameter of the thin steel plate, and end face runout measuring means for measuring the distance between these reference surfaces, It is also possible to have a stacking deviation measuring means for measuring the unevenness of the outer peripheral surface of the stacked thin steel plates along the stacking direction.

Further, a support base for supporting the stacking jig so as to be rotatable about a first support shaft parallel to the shaft of the laminated thin steel plates and a second support shaft orthogonal to the support shaft. It is also possible to have, with respect to the second support shaft, the laminated thin steel plates and a balance weight that generates a moment corresponding to the laminating jig.

[0015]

The present invention has the structure as described above, and by forming the contact surface between the presser foot and the washer as a part of the spherical surface, the thickness of the laminated steel plates is not uniform in the circumferential direction. Even in a situation where the sheet is inclined, the laminated steel sheets can be uniformly pressed in the circumferential direction.

Further, since the pressure can be uniformly applied as described above, the presser foot is inclined when the laminated thickness of the steel plates is not uniform. Then, by measuring the inclination of the presser foot as the end face runout, it is possible to determine whether the thickness of the thin steel plate is normal. Further, by detecting the unevenness in the stacking direction, it is possible to determine whether the steel plates are stacked with a shift, or whether the diameter of each steel plate is normal.

Further, a jig for laminating thin steel plates is laid down sideways with the steel plates attached so that it can be rotated around the axis of the laminated steel plates, and further, a laminating jig with the steel plates attached. The orientation of the jig can be easily changed by providing the balance weight with respect to.
Therefore, the burden on the worker can be reduced in the work of directing the welded portion upward.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a stacking jig 10 of the stator core manufacturing jig of this embodiment. Further, the laminated thin steel plates 112 are exactly the same as those used in the conventional technique, and the same reference numerals are given and the description thereof is omitted.

The thin steel plate 112 is mounted on the mounting surface 14a of the table 14. The mounting surface 14a has an annular shape corresponding to the shape of the thin steel plate. This mounting surface 14a
A shaft 18 that is rotatably supported with respect to the table 14 is disposed inside of the table so as to match the shaft of the laminated steel plates 112. A left screw 18a is provided below the shaft 18 and a right screw 18b is provided above the shaft 18. These screws 18a, 18b
And taper cones 16 and 22 are provided by being screwed together. The tapered cones 16 and 22 have tapered surfaces 16a and 22a at their one ends facing each other, and the collet 20 is arranged in contact with these tapered surfaces 16a and 22a. The collet 20 is divided into three, as shown in FIG. 2, and when the tapered cones 16 and 22 move so as to approach each other, the tapered surfaces 16a and 22a cause
The inner tapered surfaces 20a and 20b contacting these are pressed,
Each of the three collets 20 moves outward in the radial direction to expand the radius as a whole. The outer periphery of the collet 20 is in contact with the inner peripheral surface of the laminated thin steel plates 112, and the expansion of the radius of the collet 20 causes the laminated steel plates 1 to
The radial deviations of 12 can be corrected and aligned.
In addition, an O-ring 38 is provided on the upper and lower portions of the collet 20 in a rattling shape so that the collets do not come apart when the thin steel plates are not stacked. Further, in order to align the circumferential direction of the laminated steel plates 112,
The keyway 12 provided in the laminated steel plate 112 as in the prior art
A positioning key 28 that engages with 6 is provided.

Further, the table 14 is provided with three support columns 40 perpendicularly to the mounting surface 14a and between the collets 20 as shown in FIG. This support pillar 4
Although 0 is arranged so as to be in contact with the cylindrical portions of the tapered cones 16 and 22, it does not hinder the sliding of the tapered cones 16 and 22 along the axis 18. Further, a screw 40 a is provided on the uppermost part of the support column 40. These screws 40a are formed as a part of screws having the central axis of the laminated steel plates 112 as an axis.

A presser foot 3 is attached to the laminated thin steel plates 112.
4 is placed on the presser foot, and a concave spherical seat 34a
Is provided. Further, a spherical washer 42 having a contact surface 42a which is a part of a convex spherical surface in contact with the spherical seat 34a.
Is provided. The spherical seat 34a and the contact surface 42a have substantially the same radius of curvature, and a wide contact area is secured. The spherical washer 42 has a substantially annular shape, and its inner peripheral surface slidably contacts the cylindrical portion of the tapered cone 20 and is positioned in the radial direction. Further, the presser foot 34 is in contact with the above-mentioned support column 40, and the contact surface 42b of the presser foot is a curved surface, which allows the presser foot 34 to tilt. A push cap 44 is in contact with the spherical washer 42 from above, and the cap 44 is a screw of the support column 40.
A screw 44a that is screwed into a is provided.

Further, the table 14 and the presser foot 34 are provided with annular measurement reference surfaces 14b and 34b having a diameter slightly larger than the outer diameter of the thin steel plate 112. By measuring the distance between the two reference surfaces 14b and 34b, it can be determined that the thin steel plates 112 are stacked to a predetermined thickness.

Further, four knock holes 46 are arranged in the table 14 in the circumferential direction substantially equally. This knock will be described later in detail.

The operation of stacking the laminated steel plates 112 punched into the cross sectional shape of the stator using the above laminating jig 10 will be described. First, the presser foot 34, the spherical washer 42, and the pressing cap 44 are removed, and the two taper cones 16 and 22 are sufficiently separated from each other so that the collet 20 can be closed and the steel plate can be inserted. Then, the thin steel plate 112 is placed on the mounting surface 1 of the table 14.
4a are sequentially stacked. At this time, the key groove 126 provided on the outer periphery of the steel plate 112 and the key 28 are engaged and laminated. After stacking a predetermined number of sheets, the prismatic portion 18c provided on the uppermost portion of the shaft 18 is rotated counterclockwise to bring the tapered cones 16 and 22 close to each other. As a result, the collet 20 is pushed outward in the radial direction and abuts on the inner peripheral surface of the laminated steel sheet. At this time, the two taper cones 16 and 22 are respectively attached to the screws 18
Since the a and 18b move an equal amount along the axis 18, the collet 20 is pushed outward by an equal amount both at the top and at the bottom. Therefore, it is possible to uniformly open the entire area in the axial direction, to uniformly spread the laminated steel plates 112 from the inner surface, and reliably align the laminated steel plates in the axial direction.

After that, the presser foot 34 is placed on the laminated thin steel plates 112, and the spherical washer 42 is placed on this. Then, the screw 44a of the push cap 44 and the screw 40a of the support column 40 are screwed together to form the push cap 44.
Screw in. As a result, the spherical washer 42 and the presser foot 34 are pushed downward, and a predetermined pressure is applied to the laminated steel plates 112. By this pressurization, each thin steel plate 112
The burrs generated during the punching process are crushed to eliminate the gaps between the steel plates 112. This ensures the density of the magnetic material of the stator. Further, at this time, a thin steel plate 112 having a non-uniform thickness due to quirks during rolling is used, and when further stacked, the thin parts of the respective steel plates are not randomly arranged in the circumferential direction, but are unevenly arranged. Even if the presser foot 34 is tilted,
A uniform pressure can be applied in the circumferential direction. This is because the spherical washer 42 and the presser foot 34 are in contact with each other on the spherical surface, and the presser foot 34
And the support pillar 40 are also in point contact with each other.

After pressurizing with a predetermined pressure, the measurement reference surface 1
The intervals of 4b and 34b are measured over the entire circumference. Also,
The unevenness of the outer peripheral surface of the laminated steel plates 112 is measured in the axial direction, and it is confirmed whether the steel plates are displaced from each other in the direction orthogonal to the axis. These measurements are performed by using a known dial gauge or the like. Then, the measurement reference surface 14
It is determined whether the distance between b and 34b is within a predetermined range over the entire circumference, and whether the laminated thickness is a predetermined thickness. Further, it is determined whether the unevenness of the outer peripheral surface of the laminated steel plates 112 is within a predetermined position. If the measured values are not uniform over the entire circumference, the unevenness of the thickness of each steel sheet is not offset by stacking and is unevenly arranged, or a steel sheet that largely deviates from the accuracy control range for some reason. It can be judged that some have been stacked. Therefore, this work is temporarily stopped. Then, in the previous process, the process is reviewed based on this information. Further, when the measured values are uniform but the laminated thickness does not reach the predetermined value, the presser foot 34 and the like are removed and the thin steel plate 112 is adjusted. This information can also be fed back as management data of the thickness of the steel sheet by sending it to the previous process. Further, even when the unevenness of the outer peripheral surface of the laminated steel plates 112 is not within the predetermined value, it is determined that some abnormality has occurred, and the work is temporarily stopped.

If the above-mentioned abnormality is not found by applying a predetermined pressure, the laminated steel plates 112 are welded. The welding operation needs to be performed with the weld portion facing upward in order to prevent the molten metal from flowing out.
Most of the above-mentioned laminating jig and laminated steel plates are composed of steel materials, so they are quite heavy, and the work of laying them down and directing the welding surface upwards imposes a heavy burden on the operator. In this embodiment, as shown in FIG. 3, the stacking jig 10 and the whole stacked thin steel plates 112 are placed on the stand 50. The stand 50 is provided with a support base 56 that is rotatable about two axes of a first support shaft 52 that coincides with the axes of the laminated steel plates 112 and a second support shaft 54 that is orthogonal to the first support shaft 52. There is. Then, the above-described laminating jig 10 is fixed to the support base 56.

Further, the steel plate 1 laminated with the laminating jig 10
A balance weight 58 is provided to generate a moment such that the weight of 12 balances the moment generated around the shaft 54. The simplest setting of the balance weight 58 is to set the balance weight 58 having the same weight as the weight of the loading jig 10 and the steel plate 112 so that the center of gravity of the loading jig 10 and the center of gravity of the balance weight are symmetrical with respect to the axis 54. good. However, the present invention is not limited to this, and the moments generated by the shafts 52 and 54 may be set to be symmetrical.

As described above, with the thin steel plates 112 loaded and pressurized, the laminating jig 10 is rotated around the shaft 54 to be in a horizontally laid state as indicated by a two-dot chain line in the figure. At this time, the balance weight 58 enables the work to be performed without requiring a large force. And the thin steel plate 11
Among the welding allowances 136 provided on the outer peripheral portion of No. 2, welding is performed on the welding allowances that face substantially upward. When the welding of this portion is completed, the laminating jig 10 is rotated around the shaft 52 that is lying sideways, and the unwelded welding allowance 136 is directed upward to perform welding. When the stacking jig is rotated around the shaft 52, the knock pin 48 is once pulled out from the knock hole 46. The knock pin 48 (see FIG. 1) is positioned by the arm 60 with respect to the support base 56, and the stacking jig 10 is rotated to align and fix another knock hole 46 at the position of the knock pin 48. The knock hole 46 and the knock pin 48 rotate the stacking jig 10 by a predetermined angle. By repeating this, welding is performed on the welding margin of the entire circumference, and after the welding is completed, the stacking jig 10 is again set upright and the presser foot 34 and the like are removed. Then, the laminated and welded thin steel plates 112 are removed from the laminating jig 10 to complete the stator core.

[0030]

As described above, according to the present invention, since the contact surface between the presser foot and the washer is part of the spherical surface, the laminated thickness of the steel plates is uneven in the circumferential direction and the presser foot is inclined. Even in such a situation, the laminated steel sheets can be uniformly pressed in the circumferential direction.

Further, since the pressure can be uniformly applied as described above, the presser foot is inclined when the laminated thickness of the steel plates is not uniform. Then, by measuring the inclination of the presser foot as the end face runout, it is possible to determine whether the thickness of the thin steel plate is normal. Further, by detecting the unevenness in the stacking direction, it is possible to determine whether the steel plates are stacked with a shift, or whether the diameter of each steel plate is regular.

By carrying out such a measurement, it is possible to feed back to the previous step regarding the dimensional accuracy of the thin steel plate having the stator core cross section.

Further, a jig for laminating thin steel plates is laid down sideways with the steel plates attached so that it can be rotated around the axis of the laminated steel plates, and further, a laminating jig with the steel plates attached. The orientation of the jig can be easily changed by providing the balance weight with respect to. Therefore, in the work of directing the welded part upwards,
The burden on the operator can be reduced.

[Brief description of drawings]

FIG. 1 is a front cross-sectional view of a laminating jig provided in a stator core manufacturing jig of an example according to the present invention.

2 is a plan view of the laminating jig shown in FIG. 1. FIG.

FIG. 3 is an overall view of a stator core manufacturing jig of this embodiment.

FIG. 4 is a front sectional view of a conventional laminating jig.

FIG. 5 is a view showing a thin steel plate formed in a stator core cross-sectional shape.

[Explanation of symbols]

10 stacking jig, 14 table, 16, 22 taper cone, 18 axis, 20 collet, 34 presser foot, 4
0 support pillar, 42 spherical washer, 44 push cap,
50 stand, 52 1st support shaft, 54 2nd support shaft, 56 support stand, 58 balance weight.

Claims (3)

[Claims] 1. A stator core manufacturing jig used for manufacturing a stator core in which a plurality of thin steel plates having a stator core cross-sectional shape of a motor are laminated, the table including the thin steel plates placed on the table. The thin steel plate from above,
A presser foot having a washer receiving portion with a concave spherical surface in the upper portion, a spherical washer abutting on the washer receiving portion of the presser foot, and having a convex spherical contacting portion with a curvature substantially the same as the curvature of the washer receiving portion, A jig for producing a stator core of a motor, comprising: a laminating jig including a pressing means for pressing a spherical washer to press the laminated thin steel plates sandwiched by the table and the presser foot. Ingredient 2. The jig for producing a stator core according to claim 1, wherein each of the presser foot and the table is provided with an annular reference surface having a diameter larger than an outer diameter of a thin steel plate. A jig for manufacturing a stator core of a motor, comprising: an end face runout measuring means for measuring a surface interval; and a stacking deviation measuring means for measuring unevenness of an outer peripheral surface of stacked thin steel plates along a stacking direction. 3. The stator core manufacturing jig according to claim 1 or 2, wherein the laminating jig comprises a first supporting shaft parallel to an axis of the laminated thin steel plates and a first supporting shaft orthogonal to the supporting shaft. And a balance weight that generates a moment corresponding to the laminated thin steel plates and the lamination jig with respect to the second support shaft. A jig for manufacturing a stator core of a motor, which is characterized in that