JP2017212778A - Iron core forming method, iron core forming device, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely resolute an inclination of a laminate iron core caused by a plate thickness deviation of an iron core piece, and further improve formation precisely of the laminate iron core.SOLUTION: An iron core forming method includes: a material plate thickness measuring step of measuring the thickness of a steel plate 2 in a plurality of measurement reference point; an iron core piece punching step of punching an iron core piece 3 from the steel plate 2; and a rotation laminate layer step of estimating the height of a laminate at the plurality of laminate references in a case where the iron core piece 3 is relatively rotated around a center axis to a laminate body previously laminated and is laminated on the laminate body on the basis of the thickness of the steel plate 2 in the calculated reference point measured by the material plate thickness measuring step, determining an optimal rotation angle in which a laminate high polarization difference becomes the minimum value by repeating an operation of calculation of the laminate high polarization by reducing the minimum value from the maximum value of the plurality of laminate heights to be estimated at a plurality of rotation angles, and relatively laminating the iron core piece 3 onto the laminate body around the center axis by actually rotating at the optimal rotation angle.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method, an apparatus, and a program for stacking iron core pieces to form a laminated iron core.

  The laminated iron core constituting the armature of the rotating electric machine is formed by laminating iron core pieces. The core piece is manufactured by punching a plate-shaped material generally called an electromagnetic steel plate or a silicon steel plate by press working. The material of the core piece (hereinafter simply referred to as “material” in the present specification) is manufactured by slitting a coiled steel plate (raw steel plate) formed by a rolling mill to a desired width.

  The material is required to be a complete flat plate, that is, to have a uniform plate thickness at all parts. However, the rolling roller included in the rolling mill that forms the raw steel plate is bent slightly although receiving a reaction force from the object to be processed. Due to the bending of the rolling roller, the thickness of the raw material becomes non-uniform. In general, the plate thickness of the original steel plate is thick at the center in the width direction and thin at both ends in the width direction. Moreover, although it is slight, the plate | board thickness of an original steel plate changes delicately for every production lot. And as mentioned above, a raw material is manufactured by slitting a raw steel plate. For this reason, the thickness of the iron core piece punched from the material is not uniform. The difference between the maximum thickness and the minimum thickness of an iron core piece with non-uniform thickness is called thickness deviation.

  And, when the core piece punched from the material is stacked without changing the orientation, that is, in the orientation taken out from the punching machine, immediately above the part where the thickness of the core piece laminated earlier is thick, Next, a portion where the plate thickness of the core pieces to be stacked is thick is placed. Therefore, when the core pieces are stacked, the plate thickness deviation is also integrated. As a result, the laminated iron core has a non-uniform laminated height and is inclined as a whole. When the laminated iron core is tilted, the gap between the rotor and the stator becomes non-uniform, and torque fluctuation and vibration occur. That is, a malfunction occurs in the rotating electrical machine.

  In order to solve such a problem, “conversion” is performed. “Rolling” means that the iron core pieces are rotated around the central axis of the laminated iron core to change the direction of the iron core pieces and laminate. For example, the first iron core piece is laminated while being taken out from the punching machine, and the next laminated iron core piece is laminated by rotating 120 ° around the rotation center axis, and the iron core laminated for the third time. It is known that the pieces are laminated by rotating by 240 ° around the rotation center axis, and these are repeated after the fourth time. If it does in this way, the thin part of the thickness of the core piece laminated | stacked the 2nd time and the 3rd time will be mounted directly on the thick part of the core piece laminated | stacked initially. As a result, the plate thickness deviation is canceled out, and the laminated height of the laminated iron cores is averaged.

JP 2003-62623 A

  As described above, if the rollover is performed, the inclination of the laminated iron core is temporarily reduced as compared with the case where the rollover is not performed. However, the thickness deviation of the iron core piece is not constant. The portion where the maximum and minimum plate thicknesses also vary slightly for each core piece. For this reason, the conventional inversion method in which the rotation angle is changed by the same angle every time may not sufficiently cancel the thickness deviation. That is, the shape accuracy of the laminated core may not be sufficiently improved. Further, in order to improve the performance of the rotating electrical machine, it is required to further improve the shape accuracy of the laminated core.

  The present invention has been made in view of such circumstances, and the formation of a laminated core that can more reliably eliminate the inclination of the laminated core caused by the thickness deviation of the core piece and further improve the shape accuracy of the laminated core. It is an object to provide a method, a laminated core forming apparatus, and a program.

  In order to solve the above problems, a laminated core forming method according to the present invention is a laminated core forming method in which a plurality of core pieces punched from a material are laminated to form a laminated core, and at a plurality of measurement reference points, The material thickness measurement step for measuring the thickness of the material, the core piece punching step for punching the core piece from the material, and the thickness of the material at the measurement reference point measured in the material thickness measurement step The stacking height at a plurality of stacking reference points when the core pieces are stacked on the stacked body by rotating relative to the previously stacked stacked body around the central axis. And calculating the stacking height deviation by subtracting the minimum value from the estimated maximum value of the plurality of stacking heights, and repeating the operation for a plurality of rotation angles, so that the stacking height deviation is minimized. Decide A rotating lamination step of actually rotating the iron core piece around the central axis relative to the laminated body by the optimum rotation angle and laminating the laminated body on the laminated body. .

  The measurement reference point and the lamination reference point may be arranged outside an area of the material that is used as the core piece.

  The measurement reference point may be disposed outside a region of the material that is the core piece, and the lamination reference point may be disposed within a region of the material that is the core piece.

  The measurement reference point and the lamination reference point may be arranged in a region of the material that is used as the core piece.

  The rotating lamination step estimates the thickness of the material at the lamination reference point by performing an interpolation operation based on the thickness of the material at the plurality of measurement reference points measured in the material thickness measurement step. An interpolation calculation step may be included.

  When punching a plurality of the iron core pieces from the material, at least a part of the plurality of measurement reference points is an area to be used as the iron core piece and arranged between two adjacent areas in the material. , May be shared between the two areas.

  The laminated core forming apparatus according to the present invention is a laminated core forming apparatus that forms a laminated core by laminating a plurality of core pieces punched from a material, and measures the plate thickness of the material at a plurality of measurement reference points. Based on the thickness of the material at the measurement reference point measured by the plate thickness measuring unit, the core piece punching unit for punching the core piece from the material, and the core piece, When the layers are laminated on the laminate, the stacking height at a plurality of stacking reference points is estimated, and the estimated plurality of the plurality The operation of calculating the stacking height deviation by subtracting the minimum value from the maximum value of the stacking height is repeated for a plurality of rotation angles to determine the optimum rotation angle at which the stacking height deviation is minimized, and the iron core piece is centered. Around the axis, front Relative to the stack, the optimum rotation angle only by actually rotating the rotary lamination unit for laminating over the laminate, in which comprises a.

  A program according to the present invention is a computer constituting a laminated core forming apparatus that forms a laminated core by laminating a plurality of core pieces punched from a material, and is a plate thickness measuring unit that measures the thickness of the material And an iron core piece punching unit that punches the iron core piece from the material, and a rotating lamination unit that rotates the iron core piece relative to the laminate around the central axis and laminates the laminate on the laminate. Installed in a computer for controlling the sheet thickness measurement unit to function as a sheet thickness measurement means for measuring the sheet thickness of the material at a plurality of measurement reference points, and the rotating lamination unit is operated as the material plate. Based on the thickness of the material at the measurement reference point measured by the thickness measuring means, the iron core piece is rotated relative to the previously laminated body around the central axis, When stacking on the laminate, the stacking height at a plurality of stacking reference points is estimated, and the stack height deviation is calculated by subtracting the minimum value from the maximum value of the plurality of estimated stacking heights. , Repeatedly for a plurality of rotation angles to determine an optimal rotation angle at which the stacking height deviation is minimized, and the iron core piece is actually moved around the central axis relative to the stack by the optimal rotation angle. It is made to function as a rotation laminating means for laminating and laminating on the laminated body.

  According to the present invention, the roll angle of the iron core piece can be optimized according to the thickness deviation of the iron core piece, so that the deviation of the lamination height of the laminated iron core can be minimized and the inclination of the laminated iron core can be minimized. it can. As a result, the quality of the armature and the performance of the rotating electrical machine are improved.

It is explanatory drawing which shows the structure of the laminated iron core formation apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the plate | board thickness measuring unit with which the laminated core formation apparatus of FIG. 1 is provided, Comprising: Fig.2 (a) is a top view of a plate | board thickness measuring unit, FIG.2 (b) is a plate | board thickness measuring unit. It is sectional drawing cut | disconnected by the cross section shown by the AA 'line | wire in FIG. It is a figure which shows the structure of the punching unit with which the laminated core formation apparatus of FIG. 1 is provided, Comprising: It is sectional drawing which cut | disconnected the punching unit in the cross section shown by the B-B 'line | wire in FIG. It is a figure which shows the structure of the rotation lamination | stacking unit with which the laminated iron core formation apparatus of FIG. 1 is provided, Comprising: It is sectional drawing which cut | disconnected the rotation lamination | stacking unit in the cross section shown by the C-C 'line | wire in FIG. It is a figure which shows the modification of a mounting part, Comprising: It is sectional drawing corresponding to FIG. It is a flowchart which shows an example of a plate thickness measurement program. It is a top view which shows the example of arrangement | positioning of a measurement reference point. It is a top view which shows the example of arrangement | positioning of a lamination | stacking reference point. It is a flowchart which shows an example of a rotation lamination | stacking program. FIG. 9A is a plan view showing a state in which the iron core piece is rotated around the central axis, FIG. 9A is a state at a rotation angle of 0 °, FIG. 9B is a state at a rotation angle of 90 °, and FIG. FIG. 9D is a view showing a state at a rotation angle of 180 °, and FIG. 9D is a view showing a state at a rotation angle of 270 °. FIG. 10A is a plan view showing a modified example of the arrangement of measurement reference points, FIG. 10A shows an example in which three measurement reference points are arranged in an area outside the core piece, and FIG. 10B shows the outside of the core piece. FIG. 10C shows an example in which four measurement reference points are arranged in the area inside the core piece in addition to the four arranged in the area of FIG. Are shown respectively. FIG. 11A is a plan view showing another modified example of the arrangement of measurement reference points, FIG. 11A is an example in which two measurement reference points are shared between adjacent iron core pieces, and FIG. An example in which one measurement reference point is shared between iron core pieces will be shown. It is a top view which shows the example which has each arrange | positioned the measurement reference point in the area | region outside an iron core piece, and the lamination | stacking reference point in the area | region inside an iron core piece. It is a top view which shows the example from which the number of measurement reference points differs from the number of lamination | stacking reference points.

  Hereinafter, a laminated core forming method, a laminated core forming apparatus, and a program according to embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory diagram showing a configuration of a laminated core forming apparatus 1 according to an embodiment of the present invention. The laminated iron core forming apparatus 1 is an apparatus for punching out iron core pieces 3 from a steel plate 2 and laminating the iron core pieces 3 to form a laminated iron core 4. As shown in FIG. 1, the laminated core forming apparatus 1 includes a plate thickness measuring unit 5, a punching unit 6, and a rotating laminated unit 7. These are arranged in order from the left side to the right side of the figure. The laminated core forming apparatus 1 includes a feeding device (not shown). The steel plate 2 is transferred by the feeding device in the direction from the left side to the right side (feeding direction) in FIG. Therefore, the steel plate 2 is sequentially carried into the plate thickness measuring unit 5, the punching unit 6, and the rotary lamination unit 7, and processing as described later is performed. The laminated core forming apparatus 1 includes a computer 8. The plate thickness measuring unit 5, the punching unit 6, the rotary lamination unit 7, and the feeding device are controlled and operated by a computer 8.

  The steel plate 2 is a material constituting the iron core piece 3 and is a strip-like thin plate of rolled steel generally called an electromagnetic steel plate or a silicon steel plate. In addition, the steel plate 2 is manufactured by slitting a wide raw steel plate continuously rolled by a rolling mill into a width suitable for manufacturing the iron core piece 3 in a previous process (not shown). Moreover, the steel plate 2 is arrange | positioned in the left side of the laminated core formation apparatus 1 in FIG. 1 in the state (not shown) wound up by the coil shape. Then, the steel plate 2 is drawn out of the coil, sequentially transferred in the right direction in FIG. 1, and carried into the laminated iron core forming apparatus 1. In addition, the feed direction (left-right direction in FIG. 1) of the steel plate 2 corresponds to the feed direction of the rolling mill. The width direction of the steel plate 2 (the vertical direction in FIG. 1) coincides with the width direction of the rolling mill.

  The iron core piece 3 is a member constituting the laminated iron core 4 and is punched from the steel plate 2 in the punching unit 6. The iron core pieces 3 are sequentially laminated in the rotary lamination unit 7 to constitute a laminated iron core 4. The laminated iron core 4 is a component constituting an armature (stator or rotor) of a rotating electric machine (not shown).

  The plate thickness measuring unit 5 is a unit in which the steel plate 2 is first carried in the laminated core forming apparatus 1. In the plate thickness measuring unit 5, the plate thickness of the steel plate 2 is measured at a plurality of parts. The thickness of the steel plate 2 measured by the thickness measuring unit 5 is stored in the computer 8. The detailed configuration of the plate thickness measuring unit 5 will be described later. The steel plate 2 whose thickness has been measured is transferred to the punching unit 6.

  The punching unit 6 is a unit for punching the iron core piece 3 from the steel plate 2. The detailed configuration of the punching unit 6 will be described later. Further, the iron core piece 3 and the steel plate 2 punched out from the steel plate 2 are transferred to the rotary lamination unit 7.

  The rotary lamination unit 7 is a unit that separates the iron core pieces 3 transferred together with the steel plate 2 from the punching unit 6 from the steel plate 2 and sequentially laminates them to form the laminated iron core 4. Further, the rotary lamination unit 7 laminates the newly laminated iron core pieces 3 after relatively rotating with respect to the iron core pieces 3 (laminated body) previously laminated. That is, in the rotary lamination unit 7, transposition is performed. In addition, the steel plate 2 (that is, scrap) remaining after the core piece 3 is separated is transferred to the right (feed direction) in FIG. 1 and discharged out of the laminated core forming apparatus 1. The detailed configuration of the rotary lamination unit 7 will be described later.

  As shown in FIG. 2A, the plate thickness measuring unit 5 includes four sets of plate thickness meters 51. As shown in FIG. 2B, the thickness gauge 51 is composed of an upper probe 51a and a lower probe 51b. The upper probe 51a is on the upper surface of the steel plate 2, and the lower probe 51b is on the lower surface of the steel plate 2, respectively. This is a contact-type thickness gauge that measures the thickness of the steel plate 2 by contacting the steel plate 2 with the upper probe 51a and the lower probe 51b. Further, as shown in FIG. 2A, the four sets of thickness gauges 51 are virtually imagined outside the region constituting the core piece 3 of the steel plate 2 (the region separated from the steel plate 2 to become the core piece 3). It is arranged at each vertex of the square 10. Further, the plate thickness measuring unit 5 is controlled by the computer 8 to perform the measurement as described above. The thickness value of the steel plate 2 measured by the thickness gauge 51 is input to the computer 8.

  As shown in FIG. 3, the punching unit 6 includes a punching punch 61, a punching die 62, and a plate presser 63. A pushback reverse presser 64 is disposed inside the punching die 62. The punching punch 61 and the plate presser 63 are respectively driven by a driving device (not shown) and moved up and down with respect to the steel plate 2. When the plate retainer 63 is pushed down and the steel plate 2 is sandwiched between the plate retainer 63 and the punching die 62, the punching punch 61 is subsequently pushed down to punch out the core piece 3 from the steel plate 2. When the iron core piece 3 is punched from the steel plate 2, the punching punch 61 is returned to its original position (raised upward). Further, a spring element (not shown) is arranged below the pushback reverse presser 64 and when the punching punch 61 is raised, the core piece 3 is fitted back to the steel plate 2. When the core piece 3 is fitted back into the steel plate 2, the plate retainer 63 is returned to its original position (raised upward). The punching unit 6 is controlled by the computer 8. The above operation is controlled by the computer 8.

  As shown in FIG. 4, the rotary stacking unit 7 rotates and drives the stacking punch 71, the rotating stacking die 72, and the rotating stacking die 72 around the central axis of the iron core piece 3 (axis indicated by X in FIG. 4). A device 73 is provided. Further, the rotary lamination unit 7 includes a driving device (not shown) that moves the lamination punch 71 up and down. When the steel plate 2 is carried into the rotary lamination unit 7 with the core piece 3 fitted, an optimum rotation angle is determined in the computer 8 by the procedure as described later, and the rotary drive device 73 rotates the lamination. The die 72 is rotated around the X axis. As a result, the iron core piece 3 rotates relative to the rotating laminated die 72 by an optimum rotation angle. Thereafter, the lamination punch 71 is pushed down, and the core piece 3 is pushed into the rotary lamination die 72. In this way, the plurality of iron core pieces 3 are sequentially pushed into the rotary laminating die 72 to form the laminated body 9. When a predetermined number of core pieces 3 are stacked in the rotary stacking die 72, the stacked core 4 is completed.

  Since the laminated body 9 is placed in the rotating laminated die 72, the rotating laminated die 72 is rotated, and the iron core piece 3 rotates relative to the rotating laminated die 72 by an optimum rotation angle. Then, the iron core piece 3 rotates relative to the laminate 9 by an optimum rotation angle.

  As described above, the plate thickness measuring unit 5 and the rotary lamination unit 7 are controlled by the computer 8 and operate as described above. In order to perform such control, a plate thickness measurement program and a rotating lamination program are installed in the computer 8. Hereinafter, processing performed by the plate thickness measurement program and the rotating lamination program will be described.

The plate thickness measurement program is started when the steel plate 2 is carried into the plate thickness measurement unit 5. As shown in FIG. 5, when the plate thickness measurement program is started, four sets of plate thickness meters 51 provided in the plate thickness measurement unit 5 are operated, and at the four measurement reference points set on the steel plate 2. The plate thickness is measured (STEP 11). Then, the measured thickness value is stored in the computer 8 (STEP 12), and the process is finished. The measured value of the plate thickness stored in the computer 8 is referred to in the rotary lamination program. As described above, the four measurement reference points are located at the apexes of the square 10 that are virtually outside the region constituting the core piece 3 of the steel plate 2 (the region that is punched from the steel plate 2 to become the core piece 3). Has been placed. Hereinafter, as shown in FIG. 6, the four measurement reference points will be described with reference symbols a, b, c, and d. Further, the values of the plate thicknesses of the steel plate 2 measured at the measurement reference points a, b, c, and d are displayed as t _a , t _b , t _c , and t _d , respectively. That is, when the processing of the plate thickness measurement program is finished, the computer 8 stores the plate thicknesses t _a , t _b , t _c , and t _d . Further, the plate thicknesses t _a , t _b , t _c , and t _d are referred to in the rotating lamination program.

  In this way, in the laminated core forming apparatus 1, the material plate thickness measurement step is executed by the computer 8 performing the processing according to the plate thickness measurement program. Further, when the computer 8 performs processing according to the plate thickness measurement program, the plate thickness measurement unit 5 functions as a material plate thickness measurement means.

Before explaining the processing by the rotating lamination program, the lamination reference point referred to by the rotating lamination program will be explained. As illustrated in FIG. 7, the stacking reference point is arranged at each vertex of a square 10 that is virtually outside the stacked body 9 in a planar shape. Further, the relative position of the lamination reference point with respect to the laminate 9 is equal to the relative position of the measurement reference point with respect to the iron core piece 3. Hereinafter, as shown in FIG. 7, the four stacking reference points are denoted by reference symbols A, B, C, and D. In addition, the stacking heights at the stacking reference points A, B, C, and D are displayed as T _A , T _B , T _C , and T _D , respectively. The stacking heights T _A , T _B , T _C , and T _D of the stacking reference points A, B, C, and D are measured at the measurement reference points a, b, c, and d of all the core pieces 3 constituting the stacked body 9. It is estimated based on the measured plate thicknesses t _a , t _b , t _c and t _d .

Now, the rotating lamination program is started when the iron core piece 3 is carried into the rotating lamination unit 7. As shown in FIG. 8, when the rotating lamination program is started, first, the iron core piece 3 is not rotated (rotation angle = 0 °), that is, in the orientation when it is carried into the rotating lamination unit 7, Lamination reference points A, B, C, and D when laminated on the laminated body 9 (the iron core piece 3 shown in FIG. 9A is laminated on the laminated body 9 shown in FIG. 7). The stacking heights T ′ _A , T ′ _B , T ′ _C and T ′ _D are estimated (STEP 21). The stacking heights T ′ _A , T ′ _B , T ′ _C , and T ′ _D are estimated by the following equations.

_{T 'A = T A + t} a
T ′ _B = T _B + t _b
T ′ _C = T _C + t _c
T ′ _D = T _D + t _d

Then, the maximum value T ′ _MAX and the minimum value T ′ _MIN of T ′ _A , T ′ _B , T ′ _C and T ′ _D are obtained, and the difference (T ′ _MAX −T ′ _MIN ) is set as the stacking height deviation ΔT ′. Calculate (STEP 22).

Next, the iron core piece 3 carried into the rotary lamination unit 7 was rotated 90 ° clockwise (rotation angle = 90 °) and laminated on the laminate 9 (on the laminate 9 shown in FIG. 7). The stacking heights T ′ _A , T ′ _B , T ′ _C , and T ′ _D of the stacking reference points A, B, C, and D when the core pieces 3 illustrated in FIG. Estimate (STEP 23). The stacking heights T ′ _A , T ′ _B , T ′ _C , and T ′ _D are estimated by the following equations.

T ′ _A = T _A + t _{d
T 'B = T B + t} a
T ′ _C = T _C + t _b
T ′ _D = T _D + t _c

Then, the maximum value T ′ _MAX and the minimum value T ′ _MIN of T ′ _A , T ′ _B , T ′ _C and T ′ _D are obtained, and the difference (T ′ _MAX −T ′ _MIN ) is set as the stacking height deviation ΔT ′. Calculate (STEP 24).

Next, the iron core piece 3 carried into the rotary lamination unit 7 was rotated 180 ° clockwise (rotation angle = 180 °) and laminated on the laminate 9 (on the laminate 9 shown in FIG. 7). The stacking heights T ′ _A , T ′ _B , T ′ _C , and T ′ _D of the stacking reference points A, B, C, and D when the core pieces 3 illustrated in FIG. Estimate (STEP 25). The stacking heights T ′ _A , T ′ _B , T ′ _C , and T ′ _D are estimated by the following equations.

T ′ _A = T _A + t _c
T ′ _B = T _B + t _{d
T 'C = T C + t} a
T ′ _D = T _D + t _b

Then, the maximum value T ′ _MAX and the minimum value T ′ _MIN of T ′ _A , T ′ _B , T ′ _C and T ′ _D are obtained, and the difference (T ′ _MAX −T ′ _MIN ) is set as the stacking height deviation ΔT ′. Calculate (STEP26)

Finally, the iron core piece 3 carried into the rotary lamination unit 7 was rotated 270 ° clockwise (rotation angle = 270 °) and laminated on the laminate 9 (on the laminate 9 shown in FIG. 7). The stacking heights T ′ _A , T ′ _B , T ′ _C , and T ′ _D of the stacking reference points A, B, C, and D when the core pieces 3 illustrated in FIG. Estimate (STEP 27). The stacking heights T ′ _A , T ′ _B , T ′ _C , and T ′ _D are estimated by the following equations.

T ′ _A = T _A + t _b
T ′ _B = T _B + t _c
T ′ _C = T _C + t _{d
T 'D = T D + t} a

Then, the maximum value T ′ _MAX and the minimum value T ′ _MIN of T ′ _A , T ′ _B , T ′ _C and T ′ _D are obtained, and the difference (T ′ _MAX −T ′ _MIN ) is set as the stacking height deviation ΔT ′. Calculate (STEP 28).

  Next, the stacking height deviation ΔT ′ calculated in STEPs 22, 24, 26 and 28 is compared to determine the rotation angle θ at which the plate thickness deviation ΔT ′ is minimized (STEP 29).

Next, the rotating lamination die 72 is rotated counterclockwise by the rotation angle θ (STEP 30). Thereafter, the stacking punch 71 is lowered, and the core pieces 3 are pushed into the rotating stacking die 72 and stacked on the stacked body 9. Then, the stacked punch 71 is raised (STEP 31). Then, the values of the stacking heights T _A , T _B , T _C , and T _D are used as the stacking heights T ′ _A , T of the new stacked body 9 formed by stacking the core pieces 3 on the stacked body 9. The values are updated to “ _B , T ′ _C , T ′ _D” (STEP 32), and the process ends.

  As described above, in the laminated iron core forming apparatus 1, the rotational lamination step is executed by the computer 8 performing processing according to the rotational lamination program. Further, when the computer 8 performs processing according to the rotation stacking program, the rotation stacking unit 7 functions as a rotation stacking unit.

  In the above, an example in which the measurement reference point and the stacking reference point are arranged at each vertex of the square 10 imaginary in the area outside the iron core piece 3 is shown. It is not limited to such a thing. For example, as shown in FIG. 10A, three measurement reference points a, b, and c and three stacked reference points A, B, and C may be arranged in the region outside the iron core piece 3. In this case, the optimum rotation angle is selected by rotating the iron core piece 3 by 120 °. That is, the optimum rotation angle is selected from 0 °, 120 °, and 240 °. Alternatively, as shown in FIG. 10B, in addition to the measurement reference points a to d (stacking reference points A to D) arranged in the region outside the iron core piece 3, the measurement reference point e (stacking reference point E). ) May be arranged at the center of the iron core piece 3. Further, the region where the measurement reference point and the stacking reference point are arranged is not limited to the region outside the core piece 3. As shown in FIG. 10 (c), the measurement reference points a to d (stacking reference points A to D) may be arranged in a region inside the iron core piece 3.

  In the above description, an example in which a set of unique measurement reference points is arranged in each of the iron core pieces 3 has been described. However, the measurement reference points may be shared between adjacent iron core pieces 3. For example, the measurement reference points a to h are arranged as shown in FIG. 11A, the measurement reference points c and d are between the iron core piece 3a and the iron core piece 3b, and the measurement reference points e and f are iron pieces 3b. And the iron core piece 3c may be shared respectively. Alternatively, the measurement reference points a to j are arranged as shown in FIG. 11B, the measurement reference point d is between the iron core piece 3a and the iron core piece 3b, and the measurement reference point g is the iron core piece 3b and the iron core piece 3c. You may make it share between each. Thus, if a part of measurement reference point is arrange | positioned between adjacent iron core pieces 3a-3c, and will be shared between iron core pieces 3a-3c, the plate | board thickness measuring unit 5 with which the plate | board thickness measuring unit 5 is equipped will be used. The number can be reduced. As a result, the manufacturing cost of the plate thickness measuring unit 5 is reduced.

Moreover, in the above, the example which the measurement reference point and the lamination | stacking reference point are arrange | positioned in the same position, and respond | corresponds one-to-one was shown. That is, an example is shown in which when the iron core piece 3 is placed on the laminated body 9, the measurement reference points a to d overlap with the lamination reference points A to D, respectively, in a planar shape. However, the mutual relationship between the measurement reference point and the stacking reference point is not limited to such a thing. For example, as shown in FIG. 12, the measurement reference points a to d may be arranged in a region outside the core piece 3, and the lamination reference points A to D may be arranged in a region inside the core piece 3. In this case, an interpolation operation is performed based on the thickness of the core pieces 3 measured at the measurement reference points a to d, and the stacking height of the core pieces 3 at the stack reference points A to D is estimated. In the case of FIG. 12, the stacking heights T ′ _{A to} T ′ _D when no transposition is performed (rotation angle = 0 °) are estimated by the following equation. The same applies to the case of performing the inversion (rotation angle ≠ 0 °).

_{T 'A = T A + (} t a + t b) / 2
T ′ _B = T _B + (t _b + t _c ) / 2
T ′ _C = T _C + (t _c + t _d ) / 2
_{T 'D = T D + (} t d + t a) / 2

  The number of measurement reference points and the number of stacking reference points may be different. For example, as shown in FIG. 13A, four measurement reference points (measurement reference points a to d) are set, and as shown in FIG. 13B, eight stack reference points (stack reference points). A to H) may be set. In the case of FIG. 13, when no transposition is performed (rotation angle = 0 °), the stacking height of the stacking reference point having no corresponding measurement reference point is estimated by the following equation. The same applies to the case of performing the inversion (rotation angle ≠ 0 °).

_{T 'B = T B + (} t a + t b) / 2
T ′ _D = T _D + (t _b + t _c ) / 2
T ′ _F = T _F + (t _c + t _d ) / 2
T ′ _H = T _H + (t _d + t _a ) / 2

  As described above, according to the embodiment of the present invention, when the core piece 3 is laminated on the laminate 9, the optimum rotation angle at which the stacking height deviation is minimized is determined, and the optimum rotation angle is determined. Since the core piece 3 is laminated on the laminated body 9 by rotating the iron piece 3 around the central axis relative to the laminated body 9, the laminated core core can be minimized by minimizing the laminated core deviation. Can be minimized. Therefore, the shape accuracy of the laminated iron core can be sufficiently improved. As a result, the performance of the rotating electrical machine is improved.

  In the above, although embodiment and the modification of this invention were demonstrated, these illustrate the specific embodiment of this invention, and do not delimit the technical scope of this invention. The present invention can be freely modified, applied or improved within the scope of the technical idea described in the claims.

For example, in the above-described embodiment, an example is shown in which the plate thicknesses t _a , t _b , t _c , and t _d of the steel plate 2 measured in the material plate thickness measurement step are referred to as they are in the rotational lamination step. An abnormal value elimination step may be provided in the plate thickness measurement step to eliminate the abnormal value. For example, the threshold value E is determined, and the plate thickness t _c is different from other plate thicknesses t _a , t _b , t _d , that is, | t _c −t _a |, | t _c −t _b |, | t c _-t d _| any of, in the case of extremely large or extremely small value that exceeds the threshold value E, instead of the actual measured value of the thickness t _c, the thickness t _a, The arithmetic average of t _b and t _d may be the value of the plate thickness t _c . Alternatively, it may be the arithmetic mean of the thickness t _b and the plate thickness t _d of the value of the thickness t _c. Alternatively, the value of the plate thickness t _c measured in the material plate thickness measurement step related to the turn immediately before the material plate thickness measurement step may be set to the value of the plate thickness t _c in the material plate thickness measurement step. Note that the threshold value E may be determined based on a reference thickness of the material, an empirical rule, or the like. The method for determining the threshold value E is not particularly limited.

  In general, the magnetic properties of the electrical steel sheet vary depending on the angle with respect to the rolling direction. Therefore, when the optimum rotation angle is determined, the rotation angle of each core piece 3 may be dispersed so that the magnetic characteristics of the laminated core 4 are not biased.

  In stacking the iron core pieces 3, the stack height may be controlled. That is, you may make it repeat lamination | stacking of the core piece 3 until the height of the laminated body 9 reaches the lamination | stacking height of the lamination | stacking iron core 4 prescribed | regulated previously.

  In the said embodiment, although the example which equips the plate | board thickness measuring unit 5 with the contact-type plate | board thickness meter 51 was shown, the plate | board thickness meter 51 with which the plate | board thickness measuring unit 5 is provided is not limited to a contact-type thing. 51 may be a non-contact type sensor. The detection principle of the thickness gauge 51 is not particularly limited. The thickness gauge 51 may be, for example, a capacitance sensor or a laser sensor.

  In the said embodiment, although the plate | board thickness measuring unit 5, the punching unit 6, and the rotation lamination | stacking unit 7 were made independent and distributed, the example arrange | positioned disperse | distributed all or one part may be comprised. For example, the punching unit 6 may be provided with a plate thickness meter 51, and the plate thickness measuring unit 5 and the punching unit 6 may be configured integrally. Alternatively, the punching unit 6 and the rotary stacking unit 7 may be integrally configured so that punching and stacking are performed simultaneously. Alternatively, the plate thickness measuring unit 5, the punching unit 6, and the rotary lamination unit 7 may be configured integrally.

  In the above embodiment, the punching unit 6 is provided with only one set of the punching punch 61 and the punching die 62, and the iron core piece 3 is punched in one process. A plurality of pairs of punches 61 and punching dies 62 may be provided, and the core piece 3 may be completed through a plurality of steps.

  In the above-described embodiment, the rotary stacking unit 7 includes the rotation driving device 73 that rotates the rotary stacking die 72 around the X axis and rotates the stack 9. However, the stack 9 is fixed. The iron core piece 3 may be rotated around the X axis.

  In the said embodiment, the example which punches one type of iron core piece 3 from the steel plate 2, and forms one type of laminated iron core 4 was shown. However, the application target of the present invention is not limited to such a case. A plurality of types of cores 3 may be punched from the same steel plate 2 to form a plurality of types of laminated cores 4. For this purpose, the laminated core forming apparatus 1 may be provided with a plurality of rotating laminated units 7. For example, a rotor core piece and a stator core piece are punched concentrically from the same steel plate 2, and the rotor core piece and the stator core piece are laminated, respectively. You may make it form. In that case, the thickness gauge 51 dedicated to the rotor core piece and the thickness gauge 51 dedicated to the stator core piece may be provided separately or may be shared by the same thickness gauge 51.

DESCRIPTION OF SYMBOLS 1 Laminated iron core formation apparatus 2 Steel plate 3 Iron core piece 3a, 3b, 3c Iron core piece 4 Laminated iron core 5 Plate thickness measuring unit 51 Plate thickness meter 51a Upper probe 51b Lower probe 6 Punch unit 61 Punch punch 62 Punch die 63 Punch presser 64 Reverse presser for pushback 7 Rotating laminating unit 71 Laminating punch 72 Rotating laminating die 73 Rotation drive device 8 Computer 9 Laminate 10 Square

Claims (8)

In the laminated core forming method of laminating a plurality of core pieces punched from a material to form a laminated core,
A material thickness measurement step for measuring the thickness of the material at a plurality of measurement reference points;
An iron core piece punching step for punching the iron piece from the material;
Based on the thickness of the material at the measurement reference point measured in the material thickness measurement step, the iron core piece is relatively rotated around the central axis with respect to the previously laminated body, An operation of estimating a stacking height at a plurality of stacking reference points when stacked on the stacked body, and calculating a stacking height deviation by subtracting a minimum value from a maximum value of the estimated plurality of stacking heights. , Repeatedly for a plurality of rotation angles to determine an optimal rotation angle at which the stacking height deviation is minimized, and the iron core piece is actually moved around the central axis relative to the stack by the optimal rotation angle. Rotating and laminating on the laminate,
A method for forming a laminated iron core. The measurement reference point and the lamination reference point are disposed outside the region of the material that is the core piece,
The laminated core formation method according to claim 1. The measurement reference point is disposed outside the region of the material to be the core piece,
The lamination reference point is arranged in a region to be the iron core piece of the material,
The laminated core formation method according to claim 1. The measurement reference point and the lamination reference point are arranged in a region to be the core piece of the material,
The laminated core formation method according to claim 1. The rotating lamination step estimates the thickness of the material at the lamination reference point by performing an interpolation operation based on the thickness of the material at the plurality of measurement reference points measured in the material thickness measurement step. Including an interpolation step to
The laminated core formation method according to claim 1. When punching a plurality of the core pieces from the material,
At least a part of the plurality of measurement reference points is an area formed in the iron core piece, arranged in the middle of two adjacent areas in the material, and shared between the two areas.
The laminated core formation method according to claim 1. In a laminated core forming apparatus that forms a laminated core by laminating a plurality of core pieces punched from a material,
A thickness measuring unit that measures the thickness of the material at a plurality of measurement reference points;
An iron core piece punching unit for punching the iron piece from the material;
Based on the plate thickness of the material at the measurement reference point measured by the plate thickness measurement unit, the iron core piece is rotated relative to the previously laminated body around the central axis, An operation of estimating the stacking height at a plurality of stacking reference points when stacked on the stack, and calculating the stacking height deviation by subtracting the minimum value from the maximum value of the plurality of estimated stacking heights, It repeats for a plurality of rotation angles to determine the optimum rotation angle at which the stacking height deviation is minimized, and the iron core piece is actually moved around the center axis relative to the stack by the optimum rotation angle. A rotating stack unit that rotates and stacks on the stack;
A laminated iron core forming apparatus. A computer constituting a laminated core forming apparatus for forming a laminated core by laminating a plurality of core pieces punched from a material, the thickness measuring unit for measuring the thickness of the material, and the iron core from the material Installed in a computer that controls an iron core piece punching unit that punches a piece and a rotary lamination unit that rotates the iron core piece relative to the laminate around the central axis and laminates the laminate on the laminate. And
The plate thickness measuring unit functions as a material plate thickness measuring means for measuring the plate thickness of the material at a plurality of measurement reference points,
The rotating lamination unit,
Based on the thickness of the material at the measurement reference point measured by the material thickness measuring means, the iron core piece is relatively rotated around the central axis with respect to the previously laminated body, An operation of estimating a stacking height at a plurality of stacking reference points when stacked on the stacked body, and calculating a stacking height deviation by subtracting a minimum value from a maximum value of the estimated plurality of stacking heights. , Repeatedly for a plurality of rotation angles to determine an optimal rotation angle at which the stacking height deviation is minimized, and the iron core piece is actually moved around the central axis relative to the stack by the optimal rotation angle. To function as a rotating laminating means for laminating on the laminate.
program.

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