JP6653619B2 - Laminated core forming method, laminated core forming apparatus and program - Google Patents

Description

  The present invention relates to a method, an apparatus, and a program for forming a laminated core by laminating core pieces.

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

  The material is required to be a perfect flat plate, that is, to have a uniform plate thickness in all parts. However, the rolling roller provided in the rolling mill that forms the raw steel sheet bends, albeit slightly, due to the reaction force from the object to be processed. Due to the bending of the rolling roller, the thickness of the raw material becomes uneven. Generally, the thickness of the raw steel sheet is thicker at the center in the width direction and thinner at both ends in the width direction. Further, although slightly, the thickness of the raw steel sheet is slightly different for each production lot. As described above, the raw material is manufactured by slitting an original steel plate. Therefore, the thickness of the core pieces punched from the material is not uniform. The difference between the maximum thickness and the minimum thickness of an iron core piece having an uneven thickness is called a thickness deviation.

  Then, when the core pieces punched from the material are stacked without changing the direction, that is, in the direction taken out from the punching machine, immediately above the part where the plate thickness of the core pieces stacked earlier is thicker, Next, a portion where the thickness of the core pieces to be laminated is large is placed. Therefore, when the iron core pieces are stacked, the thickness deviation is also integrated. As a result, the laminated iron core has a non-uniform laminated height and is in a state of being inclined as a whole. When the laminated core is inclined, the gap between the rotor and the stator becomes non-uniform, causing torque fluctuation and vibration. That is, a problem occurs in the rotating electric machine.

  In order to solve such a problem, “transmutation” is performed. The "transduction" is to rotate the core pieces around the central axis of the laminated core, change the direction of the core pieces, and stack them. For example, the first core piece is laminated while being taken out of the punching machine, the next laminated core piece is rotated by 120 ° around the rotation center axis, and the third core piece is laminated. It is known that the pieces are rotated by 240 ° about the rotation center axis and laminated, and the fourth and subsequent times are repeated. With this configuration, the thin portions of the core pieces to be stacked for the second and third times are placed immediately above the thick portions of the iron core pieces stacked first. As a result, the thickness deviation is offset, and the stacking height of the stacked core is averaged.

JP-A-2003-62623

  As described above, when the transmutation is performed, the inclination of the laminated iron core is temporarily reduced as compared with the case where the transmutation is not performed. However, the thickness deviation of the iron core pieces is not constant. The parts where the maximum and minimum thicknesses occur also vary slightly for each iron core piece. For this reason, the conventional transposition method in which the rotation angle is changed by the same angle every time may not sufficiently offset the thickness deviation. That is, there are cases where the shape accuracy of the laminated core cannot be sufficiently improved. Further, in order to improve the performance of the rotating electric 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 more reliably eliminates the inclination of the laminated core caused by the thickness deviation of the core pieces, and further improves 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, the laminated core forming method according to the present invention is a method of laminating a plurality of core pieces punched from a material, in a laminated core forming method of forming a laminated core, at a plurality of measurement reference points, A material thickness measuring step of measuring the thickness of the material, a core piece punching step of punching the iron piece from the material, and a thickness of the material at the measurement reference point measured in the material thickness measuring step Based on the above, the iron core pieces are relatively rotated around the central axis with respect to the previously laminated body, and when laminated on the laminated body, the lamination height at a plurality of lamination reference points The operation of calculating the stack height deviation by subtracting the minimum value from the maximum value of the estimated stack heights is repeated for a plurality of rotation angles, and the optimum rotation angle at which the stack height deviation is minimized Decide A rotating lamination step of actually rotating the iron core piece around the central axis relative to the laminate by the optimal rotation angle and laminating the core on the laminate. .

  The measurement reference point and the lamination reference point may be arranged outside a region where the core piece of the material is formed.

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

  The measurement reference point and the lamination reference point may be arranged in a region where the core piece of the material is formed.

  The rotation lamination step performs an interpolation calculation based on the thickness of the material at the plurality of measurement reference points measured in the material thickness measurement step, and estimates the thickness of the material at the lamination reference point. May be included.

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

  The laminated core forming apparatus according to the present invention is configured such that a plurality of core pieces punched out of a material are laminated to form a laminated core, and the thickness of the material is measured at a plurality of measurement reference points in the laminated core forming apparatus. A sheet thickness measuring unit, a core piece punching unit for punching the core piece from the material, and, based on the thickness of the material at the measurement reference point measured by the sheet thickness measuring unit, Rotate relatively around the central axis with respect to the laminated body laminated, when laminated on the laminated body, estimate the lamination height at a plurality of lamination reference points, the estimated plurality of The operation of calculating the stack height deviation by subtracting the minimum value from the maximum value of the stack height is repeated for a plurality of rotation angles, determining the optimum rotation angle at which the stack height deviation is minimized, and centering the iron core piece. Around the axis, in 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 iron core forming apparatus for laminating a plurality of core pieces punched out of a material to form a laminated iron core, wherein the thickness measuring unit measures the thickness of the material. And a core piece punching unit for punching the core piece from the material, and a rotary laminating unit for rotating the core piece relative to the laminate around a central axis and laminating the laminate on the laminate. Installed in a computer that controls the sheet thickness measurement unit, at a plurality of measurement reference points, to function as a material thickness measurement means for measuring the thickness of the material, the rotation lamination unit, the material plate Based on the thickness of the material at the measurement reference point measured by the thickness measurement means, the iron core piece, relative to the stacked body previously stacked, relatively rotated around the central axis, In the case of stacking on the stacked body, an operation of estimating the stack height at a plurality of stack reference points and calculating a stack height deviation by subtracting a minimum value from a maximum value of the estimated stack heights is performed. Iteratively, for a plurality of rotation angles, determine the optimum rotation angle at which the stack height deviation is minimized, and rotate the iron core piece around the central axis with respect to the laminate, by the optimum rotation angle. To function as a rotating laminating means for laminating on the laminate.

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

It is an explanatory view showing composition of a lamination core forming device concerning an embodiment of the present invention. 2A and 2B are diagrams illustrating a configuration of a thickness measuring unit included in the laminated core forming apparatus illustrated in FIG. 1, wherein FIG. 2A is a plan view of the thickness measuring unit, and FIG. FIG. 2 is a cross-sectional view taken along the line AA ′ in FIG. 1. FIG. 2 is a diagram illustrating a configuration of a punching unit included in the laminated core forming apparatus illustrated in FIG. 1, and is a cross-sectional view of the punching unit cut along a cross-section indicated by line B-B ′ in FIG. 1. FIG. 2 is a cross-sectional view illustrating a configuration of a rotary lamination unit included in the laminated core forming apparatus illustrated in FIG. 1, which is a cross-section of the rotary lamination unit taken along a line C-C ′ in FIG. 1. It is a figure which shows the modification of a mounting part, and is sectional drawing corresponding to FIG. It is a flowchart which shows an example of a board thickness measurement program. It is a top view showing the example of arrangement 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 program. 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 diagram illustrating a state at a rotation angle of 180 °, and FIG. 9D is a diagram illustrating a state at a rotation angle of 270 °. It is a top view which shows the modification of arrangement | positioning of a measurement reference point, FIG.10 (a) is an example which arranges three measurement reference points in the area | region outside an iron core piece, FIG.10 (b) is an outer side of an iron core piece. Example in which one measurement reference point is arranged at the center of the iron core piece in addition to the four measurement reference points arranged in the area of FIG. 10C. FIG. 10C shows an example in which four measurement reference points are arranged in the area inside the iron core piece. Are respectively shown. FIG. 11A is a plan view illustrating another modification of the arrangement of the measurement reference points, where FIG. 11A illustrates an example in which two measurement reference points are shared between adjacent iron core pieces, and FIG. An example in which the measurement reference points are shared one by one between the iron core pieces will be described. It is a top view which shows the example which each arrange | positioned the measurement reference point in the area | region outside a core piece, and the lamination reference point in the area | region inside a core piece. It is a top view showing an example where the number of measurement reference points and the number of lamination reference points are different.

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

  FIG. 1 is an explanatory diagram illustrating a configuration of a laminated core forming apparatus 1 according to an embodiment of the present invention. The laminated core forming apparatus 1 is an apparatus that punches out core pieces 3 from a steel plate 2 and laminates the core pieces 3 to form a laminated 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 left to right in the figure. In addition, the laminated core forming apparatus 1 includes a feeding device (not shown). The steel plate 2 is transported by the feeder in a direction (feed direction) from left to right in FIG. Therefore, the steel plate 2 is sequentially carried into the plate thickness measuring unit 5, the punching unit 6, and the rotary laminating unit 7, and the processing described later is performed. Moreover, the laminated core forming apparatus 1 includes a computer 8. The thickness measuring unit 5, the punching unit 6, the rotary laminating unit 7, and the above-mentioned feeding device operate under the control of the computer 8.

  The steel plate 2 is a material constituting the iron core piece 3, and is a strip-shaped thin plate of rolled steel generally called an electromagnetic steel plate or a silicon steel plate. The steel sheet 2 is manufactured by slitting a wide raw steel sheet continuously rolled by a rolling mill into a width suitable for manufacturing the iron core piece 3 in a pre-process not shown. Further, the steel plate 2 is disposed on the left side of the laminated core forming apparatus 1 in FIG. 1 in a state of being wound into a coil shape (not shown). Then, the steel plate 2 is pulled out of the coil, sequentially transferred to the right in FIG. 1, and carried into the laminated core forming apparatus 1. The feed direction of the steel plate 2 (the left-right direction in FIG. 1) matches the feed direction of the rolling mill. The width direction (vertical direction in FIG. 1) of the steel plate 2 matches 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 core pieces 3 are sequentially laminated in the rotary laminating unit 7 to form the laminated core 4. The laminated core 4 is a component that constitutes an armature (a stator or a 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 thickness measuring unit 5, the thickness of the steel plate 2 is measured at a plurality of portions. The thickness of the steel sheet 2 measured by the thickness measuring unit 5 is stored in the computer 8. The detailed configuration of the 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 pieces 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 from the steel plate 2 are transferred to the rotary laminating unit 7.

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

  As shown in FIG. 2A, the thickness measuring unit 5 includes four sets of thickness gauges 51. As shown in FIG. 2B, the thickness gauge 51 includes 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. This is a contact type thickness gauge that measures the thickness of the steel plate 2 by contacting, that is, holding the steel plate 2 between the upper probe 51a and the lower probe 51b. Further, as shown in FIG. 2A, the four sets of thickness gauges 51 are imagined outside the region constituting the iron core piece 3 of the steel plate 2 (the region separated from the steel plate 2 to become the iron core piece 3). Are arranged at each vertex of the square 10. The thickness measuring unit 5 is controlled by the computer 8 to perform the above-described measurement. The value of the thickness 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 punch 61, a punching die 62, and a plate holder 63. A push-back reverse presser 64 is disposed inside the punching die 62. The punch 61 and the plate holder 63 are respectively driven by a driving device (not shown) and are 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 punch 61 is then pushed down to punch out the iron core piece 3 from the steel plate 2. When the core piece 3 is punched from the steel plate 2, the punch 61 is returned to its original position (pulled up). A spring element (not shown) is arranged below the push-back reverse presser 64, and when the punch 61 rises, the core piece 3 is fitted back to the steel plate 2. When the iron core piece 3 is fitted back to the steel plate 2, the plate retainer 63 is returned to its original position (pulled up). The punching unit 6 is controlled by the computer 8. The above operation is performed under the control of the computer 8.

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

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

The thickness measurement program is started when the steel plate 2 is carried into the thickness measurement unit 5. As shown in FIG. 5, when the thickness measurement program is started, four sets of thickness gauges 51 included in the thickness measurement unit 5 are operated, and at four measurement reference points set on the steel plate 2. Then, the plate thickness is measured (STEP 11). Then, the measured thickness value is stored in the computer 8 (STEP 12), and the process is terminated. The measurement value of the plate thickness stored in the computer 8 is referred to in the rotation lamination program. As described above, the four measurement reference points are located at the respective vertices of the square 10 imagined outside the region constituting the iron core piece 3 of the steel plate 2 (the region punched out of the steel plate 2 to become the iron core piece 3). Are located. Hereinafter, as shown in FIG. 6, the four measurement reference points will be described with reference numerals a, b, c, and d. Also, measurement reference points a, b, c, measured in d, the value of the plate thickness of the steel plate 2, _{respectively,} displayed in _{t a, t b, t c} , t d. That is, when the processing of the sheet thickness measurement program ends, the computer 8 stores the sheet thicknesses t _a , t _b , t _c , and t _d . The plate thicknesses t _a , t _b , t _c , and t _d are referred to in the rotation lamination program.

  As described above, in the laminated iron core forming apparatus 1, the material thickness measurement step is performed by the computer 8 performing the processing according to the thickness measurement program. In addition, the computer 8 performs processing according to the thickness measurement program, so that the thickness measurement unit 5 functions as a material thickness measurement unit.

Before describing the processing by the rotation lamination program, a lamination reference point referred to by the rotation lamination program will be described. As shown in FIG. 7, the stacking reference points are arranged at the vertices of a square 10 imagined outside the stack 9 in a planar shape. Further, the relative position of the lamination reference point to the laminate 9 is equal to the relative position of the measurement reference point to the iron core piece 3. Hereinafter, as shown in FIG. 7, the description will be made with reference numerals A, B, C and D attached to these four lamination reference points. The layered reference points A, B, C, the stack height in the D, respectively _{T A, T B, T C} , displays at _{T D.} Laminated reference points A, B, C, stack height _T A of the _{D, T B, T C,} T D , the measurement reference point a of all of the core pieces 3 of the laminate 9, b, c, in the d It is estimated based on the measured plate thicknesses t _a , t _b , t _c , and t _d .

The rotation lamination program is started when the iron core piece 3 is carried into the rotation lamination unit 7. As shown in FIG. 8, when the rotation lamination program is started, first, the iron core piece 3 is not rotated (rotation angle = 0 °), that is, in the same orientation as when the iron core piece 3 is loaded into the rotation lamination unit 7, When the cores 3 shown in FIG. 9A are laminated on the laminate 9 shown in FIG. 9A, the lamination reference points A, B, C, and D stack height _{T 'a, T' B,} T 'C, T' estimates the _D (STEP 21). The estimation of the stack heights T ' _A , T' _B , T ' _C , and T' _D is made by the following equation.

_{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, T 'A, T' B} , T 'C, T' the maximum value T _'MAX and the minimum value T' _MIN and _D, as a difference (T _'MAX -T' _MIN) stacked height deviation [Delta] T ' It is calculated (STEP 22).

Next, the iron core piece 3 carried into the rotary laminating unit 7 is rotated clockwise by 90 ° (rotation angle = 90 °) and laminated on the laminated body 9 (on the laminated body 9 shown in FIG. 7). to, the indicated and the laminated core pieces 3) when FIG. 9 (b), the laminated reference points a, B, C, stack height T _'a, T' of _{D B, T 'C, T} ' and _D It is estimated (STEP 23). The estimation of the stack heights T ' _A , T' _B , T ' _C , and T' _D is made by the following equation.

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, T 'A, T' B} , T 'C, T' the maximum value T _'MAX and the minimum value T' _MIN and _D, as a difference (T _'MAX -T' _MIN) stacked height deviation [Delta] T ' It is calculated (STEP 24).

Next, the iron core piece 3 carried into the rotary stacking unit 7 is rotated clockwise by 180 ° (rotation angle = 180 °) and stacked on the stack 9 (on the stack 9 shown in FIG. 7). to, the indicated and the laminated core pieces 3) when FIG. 9 (c), the laminated reference points a, B, C, stack height T _'a, T' of _{D B, T 'C, T} ' and _D It is estimated (STEP 25). The estimation of the stack heights T ' _A , T' _B , T ' _C , and T' _D is made by the following equation.

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, T 'A, T' B} , T 'C, T' the maximum value T _'MAX and the minimum value T' _MIN and _D, as a difference (T _'MAX -T' _MIN) stacked height deviation [Delta] T ' Calculate (STEP 26)

Finally, the iron core piece 3 carried into the rotary stacking unit 7 is rotated clockwise by 270 ° (rotation angle = 270 °) and stacked on the stack 9 (on the stack 9 shown in FIG. 7). to, the indicated and the laminated core pieces 3) when FIG. 9 (d), the laminated reference points a, B, C, stack height T _'a, T' of _{D B, T 'C, T} ' and _D It is estimated (STEP 27). The estimation of the stack heights T ' _A , T' _B , T ' _C , and T' _D is made by the following equation.

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, T 'A, T' B} , T 'C, T' the maximum value T _'MAX and the minimum value T' _MIN and _D, as a difference (T _'MAX -T' _MIN) stacked height deviation [Delta] T ' It is calculated (STEP 28).

  Next, the rotation angle θ at which the thickness deviation ΔT ′ is minimized is determined by comparing the lamination height deviation ΔT ′ calculated in STEPs 22, 24, 26, and 28 (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 iron core pieces 3 are pushed into the rotary stacking dies 72 to be stacked on the stack 9. Then, the stacking punch 71 is raised (STEP 31). The stack height _{T A, T B, T C} , T values and _D, stack height of the new stack 9 formed by laminating the core pieces 3 on the stacked body 9 T _'A, T _'B, T' _C, and updates the value of T _'D (STEP32), the process ends.

  As described above, in the laminated iron core forming apparatus 1, the computer 8 performs the processing according to the rotational lamination program, thereby executing the rotational lamination step. In addition, the computer 8 performs the processing according to the rotation lamination program, so that the rotation lamination unit 7 functions as a rotation lamination unit.

  By the way, in the above, the example in which the measurement reference point and the lamination reference point are arranged at each vertex of the imaginary square 10 in the area outside the iron core piece 3 has been described. It is not limited to such. For example, as shown in FIG. 10A, three measurement reference points a, b, and c and three lamination reference points A, B, and C may be arranged in a region outside the iron core piece 3. In this case, the selection of the optimum rotation angle is performed by rotating the iron core pieces 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 area 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. The area where the measurement reference point and the lamination reference point are arranged is not limited to the area outside the iron core piece 3. As shown in FIG. 10C, measurement reference points a to d (lamination 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 for each of the core pieces 3 has been described. However, the measurement reference points may be shared between adjacent 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 core pieces 3a and 3b, and the measurement reference points e and f are set to the iron pieces 3b. And the iron core piece 3c may be shared. Alternatively, the measurement reference points a to j are arranged as shown in FIG. 11B, the measurement reference point d is set between the core pieces 3a and 3b, and the measurement reference point g is set to the iron pieces 3b and 3c. May be shared between them. In this way, if a part of the measurement reference point is arranged between the adjacent iron core pieces 3a to 3c and shared between the iron core pieces 3a to 3c, the thickness of the thickness gauge 51 provided in the thickness measuring unit 5 can be reduced. The number can be reduced. As a result, the manufacturing cost of the thickness measuring unit 5 is reduced.

In the above description, an example has been described in which the measurement reference point and the lamination reference point are arranged at the same position and correspond to each other on a one-to-one basis. 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 the lamination reference points A to D, respectively, in a planar shape. However, the mutual relationship between the measurement reference point and the lamination reference point is not limited to such an object. For example, as shown in FIG. 12, the measurement reference points a to d may be arranged in an area outside the core piece 3, and the lamination reference points A to D may be arranged in an area inside the iron piece 3. In this case, an interpolation calculation is performed based on the thickness of the iron core pieces 3 measured at the measurement reference points a to d, and the stacking height of the iron core pieces 3 at the stacking reference points A to D is estimated. In the case of FIG. 12, the stacking heights T ′ _{A to} T ′ _D when the transmutation is not performed (rotation angle = 0 °) are estimated by the following equations. This applies when performing transmutation (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 lamination 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. A to H) may be set. In the case of FIG. 13, when the transposition is not performed (rotation angle = 0 °), the stack height of the stack reference point having no corresponding measurement reference point is estimated by the following equation. This applies when performing transmutation (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 iron core pieces 3 are stacked on the stacked body 9, the optimum rotation angle at which the stack height deviation is minimized is determined, and the optimum rotation angle is determined. Only by rotating the core piece 3 around the central axis relative to the laminate 9 and laminating the core piece 3 on the laminate 9, the stacking height deviation of the laminated core is minimized, and the laminated core is minimized. Can be minimized. Therefore, the shape accuracy of the laminated core can be sufficiently improved. As a result, the performance of the rotating electric machine is improved.

  In the above, the embodiments and the modified examples of the present invention have been described, but these are illustrative of specific embodiments of the present invention and do not delimit the technical scope of the present invention. The present invention can be freely modified, applied or improved without departing from the technical concept described in the claims.

For example, in the above-described embodiment, the example in which the thicknesses t _a , t _b , t _c , and t _d of the steel sheet 2 measured in the material thickness measurement step are directly referred to in the rotation lamination step has been described. An abnormal value exclusion step may be provided in the plate thickness measurement step to eliminate an abnormal value. For example, the difference between the previously determined threshold E, the thickness _{t c} is other thickness _{t a,} and t b, _{t d, i.e., | 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, t _b, may be the arithmetic mean of the _{t d} to a value of 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 thickness t _c measured by the material thickness measuring step according to the last turn of the material thickness measuring step, may be the value of the thickness t _c of the material thickness measuring step. Note that the threshold value E may be determined based on the reference plate 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 magnetic steel sheet vary depending on the angle with respect to the rolling direction. Therefore, when determining the optimum rotation angle, the rotation angles of the core pieces 3 may be dispersed so that the magnetic characteristics of the laminated core 4 do not become biased.

  In stacking the core pieces 3, control may be performed based on the stacking height. That is, the lamination of the core pieces 3 may be repeated until the height of the laminated body 9 reaches a predetermined lamination height of the laminated core 4.

  In the above embodiment, the example in which the contact thickness gauge 51 is provided in the thickness measurement unit 5 has been described, but the thickness gauge 51 provided in the thickness measurement unit 5 is not limited to the contact thickness gauge. 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 above embodiment, the example in which the thickness measuring unit 5, the punching unit 6, and the rotary laminating unit 7 are independently arranged and dispersed is shown. However, all or a part of these units may be integrally configured. For example, the punching unit 6 may be provided with a thickness gauge 51, and the thickness measuring unit 5 and the punching unit 6 may be integrally configured. Alternatively, the punching unit 6 and the rotary laminating unit 7 may be integrally formed so that the punching and the lamination are performed simultaneously. Alternatively, the plate thickness measuring unit 5, the punching unit 6, and the rotary laminating unit 7 may be integrally configured.

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

  In the above-described embodiment, an example in which the rotary stacking unit 7 is provided with the rotation driving device 73 that rotates the rotary stacking die 72 around the X axis to rotate the multilayer body 9 has been described. Alternatively, the iron core piece 3 may be rotated around the X axis.

  In the above embodiment, an example has been shown in which one type of core piece 3 is punched from a steel plate 2 to form one type of laminated core 4. However, the application target of the present invention is not limited to such. A plurality of types of laminated cores 4 may be formed by punching a plurality of types of core pieces 3 from the same steel plate 2. For this purpose, the laminated core forming apparatus 1 may be provided with a plurality of rotary laminated units 7. For example, from the same steel plate 2, a rotor core piece and a stator core piece are punched concentrically, and the rotor core piece and the stator core piece are laminated, respectively, to form a rotor laminated core and a stator laminated core. It may be formed. In this case, the thickness gauge 51 dedicated to the rotor core piece and the thickness gauge 51 dedicated to the stator core piece may be separately provided, or may be shared by the same thickness gauge 51.

REFERENCE SIGNS LIST 1 laminated iron core forming device 2 steel plate 3 iron core piece 3 a, 3 b, 3 c iron core piece 4 laminated iron core 5 plate thickness measuring unit 51 thickness gauge 51 a upper probe 51 b lower probe 6 punching unit 61 punching punch 62 punching die 63 plate holder 64 Reverse presser for pushback 7 Rotating laminating unit 71 Laminating punch 72 Rotating laminating die 73 Rotary drive 8 Computer 9 Laminate 10 Square

Claims (8)

In a laminated core forming method of laminating a plurality of core pieces punched from a material to form a laminated core,
At a plurality of measurement reference points, a material thickness measuring step of measuring the thickness of the material,
Core piece punching step of punching the core 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, relative to the previously laminated body is rotated relatively around a central axis, When stacking on the stacked body, the operation of estimating the stacking height at a plurality of stacking reference points and calculating the stacking height deviation by subtracting the minimum value from the estimated maximum value of the stacking heights. Iteratively, for a plurality of rotation angles, determine the optimum rotation angle at which the stack height deviation is minimized, and rotate the iron core piece around the central axis with respect to the laminate, by the optimum rotation angle. Rotating, laminating the laminated body on the laminated body,
A method for forming a laminated iron core having: The measurement reference point and the lamination reference point are arranged outside a region to be the core piece of the material,
The method for forming a laminated core according to claim 1. The measurement reference point is arranged outside a region to be the core piece of the material,
The lamination reference point is arranged in an area to be the core piece of the material,
The method for forming a laminated core according to claim 1. The measurement reference point and the lamination reference point are arranged in an area to be the core piece of the material,
The method for forming a laminated core according to claim 1. The rotation lamination step performs an interpolation calculation based on the thickness of the material at the plurality of measurement reference points measured in the material thickness measurement step, and estimates the thickness of the material at the lamination reference point. Including an interpolation operation step of
The method for forming a laminated core according to claim 1. When punching a plurality of core pieces from the material,
At least a part of the plurality of measurement reference points is a region to be the iron core piece, is disposed in the middle of two adjacent regions in the material, and is shared between the two regions.
The method for forming a laminated core according to claim 1. In a laminated core forming apparatus that laminates a plurality of core pieces punched from a material to form a laminated core,
At a plurality of measurement reference points, a thickness measuring unit that measures the thickness of the material,
A core piece punching unit for punching the core 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, relative to the previously laminated body is rotated relatively around a central axis, When stacked on the stack, the stack height at a plurality of stacking reference points is estimated, the operation of calculating the stack height deviation by subtracting the minimum value from the maximum value of the estimated stack heights, Repeatedly for a plurality of rotation angles, determine the optimum rotation angle at which the stack height deviation is minimized, and, relative to the laminate, around the central axis, relative to the laminate, the actual optimum rotation angle. Rotating, a rotating lamination unit to laminate on the laminate,
A laminated core forming apparatus comprising: A computer constituting a laminated core forming apparatus that forms a laminated core by laminating a plurality of core pieces punched out of a material, comprising: a thickness measuring unit configured to measure a thickness of the material; and A core piece punching unit for punching a piece, and a core piece installed on a computer that controls a rotary laminating unit for laminating on the laminate by rotating the core piece around a central axis relative to the laminate. hand,
The plate thickness measurement unit, at a plurality of measurement reference points, function as a material thickness measurement means for measuring the thickness of the material,
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, relative to the previously laminated body is rotated relatively around a central axis, When stacking on the stacked body, the operation of estimating the stacking height at a plurality of stacking reference points and calculating the stacking height deviation by subtracting the minimum value from the estimated maximum value of the stacking heights. Iteratively, for a plurality of rotation angles, determine the optimum rotation angle at which the stack height deviation is minimized, and rotate the iron core piece around the central axis with respect to the laminate, by the optimum rotation angle. To function as rotating laminating means for laminating on the laminate,
program.

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