Method and device for inspecting laminated iron core, and method and device for repairing laminated iron core

Abstract

The invention provides a laminated iron core inspection method which can inspect the protruding amount of a welding part with high precision and high speed. A laminated core (1) in which a plurality of annular core pieces (3) are laminated in the axial direction and a plurality of circumferential welded sections (5) that reach an end surface (1a) formed by the core pieces (3) at the axial ends are provided, the laminated core (1) being rotated in the circumferential direction and the circumferential welded sections (5) being welded to the end surface (1a) in accordance with the rotation of the laminated core (1). The amount of protrusion of the plurality of welded sections (5) with respect to the end surface (1a) in the axial direction is continuously measured from the axial direction.

Description

Technical Field

[0001] The present invention relates to an inspection method and device, and a repair method and device for a laminated core used in an electric motor or the like. Background Art

[0002] As a conventional laminated core, there is a laminated core (for example, Patent Document 1) in which a plurality of annular core pieces are stacked in the axial direction and connected at a plurality of locations in the circumferential direction by welding portions extending throughout the axial direction.

[0003] In such a laminated core, the welded portion may protrude from the axial end surface of the laminated core. This protrusion may reduce assembly accuracy or cause scratches when assembling the laminated core to the end plate or the rotor shaft, and may be required to be smaller than a predetermined standard.

[0004] In this case, in the manufacturing process of the laminated core, it is necessary to check the protrusion amount of the welded portion from the end surface and to remove or repair the laminated core in which the protrusion amount of the welded portion is larger than a reference.

[0005] However, since the inspection of the protrusion amount of the welded portion needs to be performed on all the multiple welded portions in each laminated core, the number of inspections is large. Therefore, such inspection of the protrusion amount requires not only accuracy but also speed, and is difficult to implement.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent No. 6469355 Summary of the invention

[0009] Problems to be solved by the invention

[0010] The problem to be solved is that high-precision and high-speed inspection of the protrusion amount of the weld has not yet been achieved.

[0011] Solutions to Solve Problems

[0012] The present invention provides a method for inspecting a laminated core, wherein the laminated core has a plurality of annular core sheets stacked in an axial direction and is provided with a plurality of circumferential welds reaching end faces formed by the core sheets at the end portions in the axial direction. In the inspection method, the laminated core is rotated in the circumferential direction, and the protrusion amounts of the plurality of welds relative to the end faces in the axial direction are continuously measured from the axial direction as the laminated core rotates.

[0013] Furthermore, the present invention provides a laminated core repair method using the laminated core inspection method. In the repair method, when the protrusion exceeds a reference, a laser is irradiated from the axial direction to the protruding portion of the weld protruding from the end surface in the axial direction so that the protrusion is within the range of the reference.

[0014] The present invention further provides an inspection device for a laminated core, wherein the laminated core is stacked with a plurality of annular core sheets in an axial direction and is provided with a plurality of circumferential welds reaching end faces formed by the core sheets at the ends in the axial direction. The inspection device comprises: a rotating portion that supports the laminated core so as to rotate in the circumferential direction; and a measuring portion that is arranged in the axial direction to face the end faces of the rotating laminated core, and continuously measures the protrusion amounts of the plurality of welds in the axial direction relative to the opposed end faces as the laminated core rotates.

[0015] The present invention further provides a laminated core repairing device using the laminated core inspection device, the repairing device comprising a laser irradiation unit, which irradiates a protruding portion of the welded portion protruding from the end surface along the axial direction with laser light from the axial direction when the protrusion exceeds a reference, so that the protrusion is within the range of the reference.

[0016] The effects of the invention are as follows.

[0017] The laminated core inspection method and apparatus of the present invention can inspect the protrusion amount of the welded portion with high accuracy and at high speed.

[0018] The method and apparatus for repairing a laminated core of the present invention can repair the laminated core at high speed and reliably by inspecting the protrusion amount of the welded portion with high accuracy and at high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a perspective view showing a laminated core to be inspected according to the first embodiment of the present invention.

[0020] Figure 2 It is shown in an enlarged manner Figure 1 A stereogram of a portion of.

[0021] Figure 3 It is shown Figure 2 A top view of the welding area.

[0022] Figure 4 It is shown Figure 2 A side view of the weld area.

[0023] Figure 5 This is a block diagram showing the inspection device of the first embodiment.

[0024] Figure 6 It is shown Figure 5 A side view of a part of the simplified structure of the inspection device in cross section.

[0025] Figure 7 It is shown that Figure 6 A part of the measurement of the welded portion is a side view of the rotating portion and the measuring portion of the cross section.

[0026] Figure 8 It is shown Figure 6 A top view of the rotating portion and the reversing portion of the inspection device.

[0027] Fig. 9 It is a process diagram showing the inspection method of the laminated core of Example 1.

[0028] Fig.10 This is a side view showing a schematic structure of a repair device according to a second embodiment of the present invention, with a portion thereof being a cross section.

[0029] Fig.11 It is shown that Fig.10 A side view of a rotating portion, a measuring portion, and a laser irradiation portion, which are part of the cross section, during measurement and repair of a weld portion.

[0030] Fig.12 (A) to (C) are process diagrams showing a method for repairing a laminated core. Fig.12 (A) shows the whole process, Fig.12 (B) shows Fig.12 Details of the first repairing step of (A), Fig.12 (C) shows Fig.12 Details of the second repairing step of (A).

[0031] Fig.13 This is a block diagram showing a repair device according to a third embodiment of the present invention.

[0032] Fig.14 It is shown Fig.13 A side view of a part of the simplified structure of the inspection device in cross section. DETAILED DESCRIPTION

[0033] The protrusion amount of the welded portion relative to the axial end surface is measured from the axial direction while the laminated core is rotated, thereby achieving the purpose of being able to inspect the protrusion amount of the welded portion with high accuracy and high speed.

[0034] As shown in the drawings, the laminated core inspection method is a method for inspecting a laminated core 1 in which a plurality of annular core pieces 3 are stacked in the axial direction. The laminated core 1 has a plurality of circumferential welds 5 reaching end faces 1a formed of core pieces 3 located at the axial ends.

[0035] In this inspection method, the laminated core 1 is rotated in the circumferential direction, and the protrusion amounts of the plurality of welded portions 5 relative to the end surface 1 a in the axial direction are continuously measured along with the rotation of the laminated core 1 .

[0036] In such an inspection method, the dimensions of the welded portion 5 in the circumferential direction and radial direction of the laminated core 1 can be three-dimensionally measured together with the protrusion amount of the welded portion 5 .

[0037] The protrusion amount may be measured by measuring the protrusion amount on one end surface 1 a of the laminated core 1 in the axial direction, and then inverting the laminated core 1 to measure the protrusion amount on the other end surface 1 a in the axial direction.

[0038] Furthermore, the axial dimension of the laminated core 1 may be measured before measuring the protrusion amount, and the axial position of the laminated core 1 may be relatively adjusted based on the measured dimension so that the distance between the measurement source 13 for measuring the protrusion amount and the end surface 1a is constant in the axial direction.

[0039] In the method for repairing the laminated core 1 using such an inspection method, when the protrusion exceeds the reference, the protrusion 5a of the weld 5 protruding axially from the end surface 1a is irradiated with laser light to bring the protrusion within the reference range.

[0040] It is preferred that the laser beam be irradiated on the same end surface 1 a of the laminated core 1 as the welded portion 5 to be measured, and be performed in parallel with the measurement of the protrusion amount.

[0041] The inspection device 7 of the laminated core 1 includes a rotating unit 11 and a measuring unit 13. The rotating unit 11 supports the laminated core 1 so as to rotate in the circumferential direction. The measuring unit 13 is arranged axially opposite to the end face 1a of the rotating laminated core 1, and continuously measures the protrusion amounts of the plurality of welded portions 5 relative to the opposite end face 1a in the axial direction from the axial direction as the laminated core 1 rotates.

[0042] The measuring unit 13 may measure the protrusion amount and three-dimensionally measure the dimensions of the laminated core 1 at the welded portion 5 in the circumferential direction and the radial direction.

[0043] The inspection device 7 may include a gripping unit 15 that grips and inverts the laminated core 1. In this case, after the measuring unit 13 measures the protrusion amount of one axial end face 1a, the gripping unit 15 inverts the laminated core 1 and the measuring unit 13 measures the protrusion amount of the other axial end face 1a.

[0044] Furthermore, the inspection device 7 may also include a dimension measuring unit 9 for measuring the axial dimension of the laminated core 1. In this case, the rotating unit 11 or the measuring unit 13 is moved in the axial direction so that the distance between the measuring unit 13 and the end surface 1a is constant in the axial direction based on the measured dimension, and the position of the laminated core 1 in the axial direction is relatively adjusted.

[0045] The repair device 19 including the inspection device 7 includes a laser irradiation unit 21. When the protrusion amount of the weld 5 exceeds the reference, the laser irradiation unit 21 irradiates the protrusion 5a of the weld 5 protruding axially from the end surface 1a with laser light so that the protrusion amount falls within the reference range.

[0046] The laser irradiation unit 21 may be disposed axially opposite to the end surface 1a of the laminated core 1, and laser irradiation may be performed on the same end surface 1a of the laminated core 1 as the welded portion 5 to be measured in parallel with the measurement of the protrusion amount.

[0047] Example 1

[0048] [Laminated core]

[0049] Figure 1 This is a perspective view showing a laminated core to be inspected according to the first embodiment of the present invention. Figure 2 It is shown in an enlarged manner Figure 1 A stereogram of a portion of. Figure 3 It is shown Figure 2 A top view of the welding area. Figure 4 It is shown Figure 2 A side view of the weld area.

[0050] The laminated core 1 to be inspected is a rotor core used for a rotating part of an electric motor or a generator. However, the laminated core 1 may also be a stator core for a stator.

[0051] The laminated core 1 is formed by stacking a plurality of annular core sheets 3 in the axial direction and integrating them by a plurality of welding portions 5. The plurality of welding portions 5 are arranged at intervals in the circumferential direction relative to the laminated core 1. The annular core sheets 3 may be either a non-split core composed of a single annular member or a split core in which arc-shaped members for the core are arranged in an annular shape. In the present embodiment, the core sheets 3 are split cores.

[0052] The axial direction refers to a direction along the axis of the laminated core 1 . In the following, the circumferential direction refers to an extending direction around the axis of the laminated core 1 , and the radial direction refers to a direction along the diameter of the laminated core 1 .

[0053] The plurality of welded portions 5 are respectively provided to extend axially throughout the inner periphery of the laminated core 1 and reach the end faces 1a formed by the core sheets 3 at the axial ends of the laminated core 1. In addition, if the welded portion 5 reaches any one of the end faces 1a of the laminated core 1, it can be the object of inspection. Therefore, the welded portion 5 may be formed only at any one of the axial ends.

[0054] The weld 5 has a molten width W and a molten depth D in the planar shape when viewed from the axial direction. The molten width W refers to the size of the weld 5 in the circumferential direction, and the molten depth D refers to the size of the weld 5 in the radial direction relative to the edge of the inner circumference of the core sheet 3. In addition, when the weld 5 is formed on the outer circumference of the laminated core 1, the molten depth D becomes the size of the weld 5 in the radial direction relative to the edge of the outer circumference. In addition, the weld 5 sometimes has a protrusion 5a protruding in the axial direction from the end face 1a. The size (protrusion height) of the protrusion 5a in the axial direction relative to the end face 1a is called the protrusion amount H.

[0055] In the inspection method of the present embodiment, the inspection device 7 is used to inspect the fusion width W, fusion depth D, and protrusion H of such a weld 5. The protrusion H is inspected for assembly accuracy, etc. The inspection of the fusion width W and the fusion depth D is sometimes performed to determine whether the fusion width W and the fusion depth D are within a predetermined range based on the judgment of the suitability of the weld 5. Therefore, when the fusion width W and the fusion depth D are not required, the inspection can be omitted.

[0056] [Inspection device]

[0057] Figure 5 This is a block diagram showing the inspection device of the first embodiment. Figure 6 It is shown Figure 5 A side view of a part of the simplified structure of the inspection device in cross section. Figure 7 It is shown that Figure 6 A part of the measurement of the welded portion is a side view of the rotating portion and the measuring portion of the cross section. Figure 8 It is shown Figure 6 A top view of the rotating portion and the reversing portion of the inspection device.

[0058] The inspection device 7 of the laminated core 1 is incorporated in, for example, a production line of the laminated core 1. The inspection device 7 includes a dimension measuring unit 9, a rotating unit 11, a three-dimensional measuring unit 13 as a measuring unit, a gripping unit 15, and a control unit 17.

[0059] The dimension measuring unit 9 is a dimension measuring device for measuring the axial dimension of the laminated core 1. In the dimension measuring unit 9 of the present embodiment, a pressurizing plate 9b is movably disposed opposite to a mounting plate 9a on which the laminated core 1 is mounted. The dimension measuring unit 9 pressurizes the laminated core 1 in the axial direction between the mounting plate 9a and the pressurizing plate 9b to obtain the axial dimension of the laminated core 1 at this time.

[0060] In addition, the dimension measuring unit 9 may obtain the dimension of the laminated core 1 in the axial direction without applying pressure. The dimension measuring unit 9 may be a non-contact measuring device using laser or the like. Furthermore, the dimension measuring unit 9 may be omitted.

[0061] The rotating portion 11 supports the laminated core 1 so as to rotate in the circumferential direction. The rotating portion 11 of the present embodiment includes a base 11a, a rotating plate 11b, and a rotating shaft 11c.

[0062] The base 11a is a component that moves between a measurement position MP and a reversal position RP. The measurement position MP is a position for measuring the weld 5 including the protrusion amount H of the weld 5 of the laminated core 1 by the three-dimensional measuring unit 13 described below, and the reversal position RP is a position for reversing the laminated core 1 by the gripping unit 15 described below.

[0063] In this embodiment, there is one measuring position MP and one reversing position RP, and the base 11a reciprocates between the measuring position MP and the reversing position RP. The reciprocating movement may be performed by a suitable drive device such as a linear actuator, a linear guide, or an electric motor.

[0064] The base 11a is provided with a through hole 11aa. The through hole 11aa penetrates the base 11a in the up-down direction which is the intersecting direction intersecting the moving direction of the base 11a. The rotating plate 11b is arranged on the through hole 11aa.

[0065] The vertical direction is the vertical direction of the inspection device 7, which is the vertical direction in this embodiment, but may not necessarily be the vertical direction depending on the installation condition of the inspection device 7. The vertical direction coincides with the axial direction of the laminated core 1 rotated by the rotating unit 11 in this embodiment.

[0066] The rotating plate 11b is a plate-shaped member disposed on the base 11a. The rotating plate 11b is not coupled to the base 11a in the up-down direction, but can be moved so as to be separated upward from the base plate 11a.

[0067] The rotating plate 11b has a mounting surface 11ba on which the laminated core 1 is mounted. Positioning pins 11bb are provided on the mounting surface 11ba. The pins 11bb are inserted in the axial direction into positioning holes 1b formed in the laminated core 1 to position the laminated core 1 on the mounting surface 11ba of the rotating plate 11b.

[0068] At the measurement position MP, the rotating shaft 11c is disposed below the base 11a so as to be able to move forward and backward in the vertical direction. The rotating shaft 11c can be a simple rod-shaped device driven in the vertical direction, a retractable cylinder device, etc. When the base 11a is located at the measurement position MP, the rotating shaft 11c enters the upper part and engages with the rotating plate 11b through the through hole 11aa of the base 11a, thereby supporting the rotating plate 11b.

[0069] The rotating shaft 11c can adjust the vertical support position of the rotating plate 11b according to the amount of upward penetration. The penetration amount is set according to the axial dimension of the laminated core 1. As a result, the rotating part 11 is moved in the axial direction so that the distance between the three-dimensional measuring part 13 and the end face 1a of the laminated core 1 on the rotating part 11 is constant in the axial direction, thereby relatively adjusting the axial position of the laminated core 1.

[0070] Furthermore, since the axial position of the laminated core 1 can be adjusted relatively between the three-dimensional measuring unit 13 and the laminated core 1, the three-dimensional measuring unit 13 can also be moved in the axial direction. In other words, in adjusting the axial position of the laminated core 1, either the laminated core 1 or the three-dimensional measuring unit 13 as a measurement source can be moved in the axial direction relative to the other.

[0071] Furthermore, the rotating shaft 11c may be integrally connected to the rotating plate 11b. In this case, when the base 11a moves, the rotating plate 11b and the rotating shaft 11c also move together.

[0072] Such a rotating shaft 11c is connected to a driving source 11d such as a stepping motor, and is intermittently rotated around the axis by the driving source 11d. The intermittent rotation in this embodiment means that the rotation is repeatedly performed and then stops after a predetermined angle. In addition, the rotation around the axis can also be performed continuously.

[0073] By this axial rotation, the rotating shaft 11 c integrally rotates the coupled rotating plate 11 b , and rotates the laminated core 1 via the rotating plate 11 b .

[0074] The three-dimensional measuring unit 13 is constituted by a three-dimensional measuring instrument and is disposed above the rotating unit 11 when the base 11a is located at the measuring position MP. Thus, at the measuring position MP, the three-dimensional measuring unit 13 faces the end surface 1a of the rotating laminated core 1 in the axial direction.

[0075] The three-dimensional measuring unit 13 continuously measures the protrusion amounts H of the plurality of welds 5 relative to the opposing end faces 1a in the axial direction as the laminated core 1 rotates. In this embodiment, the fusion width W and the fusion depth D are three-dimensionally measured together with the protrusion amounts H of the welds 5.

[0076] Measuring from the axial direction means measuring from a position separated in the axial direction, not measuring along the axial direction. Three-dimensional measurement can be performed using an appropriate method such as an optical interference method or a confocal method that uses a laser or light to read three-dimensional coordinates. Furthermore, the measurement is preferably performed in a non-contact manner, but it can also be performed by contact. In addition, the measurement may not be a three-dimensional measurement if it is to measure the protrusion H of the weld 5. In this case, an appropriate height measuring device can be used.

[0077] Continuous measurement means that the three-dimensional measuring unit 13 sequentially measures the welded portions 5 opposed to each other in the vertical direction as the laminated core 1 rotates continuously or intermittently. In the present embodiment, the three-dimensional measuring unit 13 measures the welded portions 5 opposed to each other when the rotation stops as the laminated core 1 rotates intermittently. The three-dimensional measuring unit 13 may also be rotated in the circumferential direction relative to the laminated core 1.

[0078] The gripping portion 15 grips the laminated core 1 to reverse it. In this embodiment, the gripping portion 15 is composed of a pair of arm portions 15a. The arm portions 15a are supported in a reversible manner by a reversing drive mechanism 15b such as a gear rack pair, and are supported in a manner that allows movement in the vertical direction by a vertical drive mechanism 15c such as a linear guide.

[0079] The gripping part 15 descends to grip the laminated core 1 at the reverse position RP, and then ascends to reverse. In this reversed state, the gripping part 15 descends to release the laminated core 1 from the rotating part 11 .

[0080] In addition, the gripping portion 15 may be omitted. In this case, the protrusion amount H may be measured from both axial sides or only from one axial side without inverting the laminated core 1 , or the laminated core 1 may be inverted manually.

[0081] The control unit 17 is a computer including a control device such as a processor and a storage device such as a memory, which controls each part of the inspection device 7. The control unit 17 implements the inspection method by controlling each part of the inspection device 7.

[0082] [Inspection method of laminated core]

[0083] Fig. 9 It is a process diagram showing the inspection method of the laminated core 1 of the first embodiment.

[0084] In the inspection method of the laminated core 1 of the present embodiment, a dimension measuring step, a height adjusting step, a first weld measuring step, a first judging step, a reversing step, a second weld measuring step, and a second judging step are performed to inspect the plurality of welds 5 of the laminated core 1. The laminated core 1 is obtained by preliminarily stacking annular core sheets 3 and integrating them by the plurality of welds 5.

[0085] In the sizing process, Figure 6 As shown, the dimension measuring unit 9 receives the laminated core 1 conveyed on the manufacturing line. The receiving can be performed by a pick-up and placement unit (not shown) or the like. The dimension measuring unit 9 presses the received laminated core 1 in the axial direction between the mounting plate 9a and the pressurizing plate 9b to measure the dimension. When the dimension measurement is completed, the laminated core 1 is conveyed on the manufacturing line and the next height adjustment process is performed.

[0086] In the height adjustment step, the rotating unit 11 receives the conveyed laminated core 1 on the rotating plate 11b. The receiving can be performed by using a pick-up and placement unit (not shown), the gripping unit 15, or the like.

[0087] When the laminated core 1 is received on the rotating plate 11b, the pins 11bb on the rotating plate 11b are inserted into the holes 1b of the laminated core 1 to position the laminated core 1 on the rotating plate 11b. In this state, the base 11a of the rotating unit 11 moves to the measurement position MP.

[0088] At the determination position MP, Figure 7 As shown in FIG. 1 , the rotating shaft 11 c enters upward and engages with the rotating plate 11 b. At this time, the amount of entry of the rotating shaft 11 c is adjusted based on the axial dimension of the laminated core 1 measured in the dimension measuring step.

[0089] Thus, the rotating part 11 is moved in the axial direction to adjust the vertical (axial) position (height) of the laminated core 1 relative to the three-dimensional measuring part 13 so that the distance between the three-dimensional measuring part 13 and the end surface 1 a of the laminated core 1 is constant in the axial direction.

[0090] The first weld portion measuring step and the first determination step together constitute a first inspection step. In the first weld portion measuring step, first, the rotating plate 11b is rotated by the rotating shaft 11c. As a result, the laminated core 1 rotates in the circumferential direction. The rotation is an intermittent rotation that stops at a predetermined angle, and each time it stops, the weld portion 5 of the laminated core 1 and the three-dimensional measuring portion 13 are opposed to each other in the vertical direction.

[0091] Then, the three-dimensional measuring unit 13 measures the protrusion amount H of the opposed welded portion 5 relative to the end surface 1a in the axial direction. In this embodiment, the protrusion amount H is measured together with the fusion width W and the fusion depth D by three-dimensional measurement.

[0092] Thus, in this embodiment, the welded portion 5 is measured from the axial direction, and the protrusion amount H of the welded portion 5 can be accurately measured including the position of the protrusion 5a in the welded portion 5. In addition, in this embodiment, the fusion width W and the fusion depth D can be accurately measured together with the protrusion amount H. In addition, in this embodiment, since the measurement is performed from the axial direction while the laminated core 1 is rotated, a plurality of welded portions 5 can be measured quickly.

[0093] Furthermore, each weld 5 can be measured while the interval between the three-dimensional measuring part 13 and the end face 1a is kept constant, and the variation of the measurement conditions for each weld 5 can be suppressed, thereby improving the measurement accuracy and achieving stabilization. Furthermore, the interval between the three-dimensional measuring part 13 and the end face 1a can be easily kept constant by using the rotating shaft 11c.

[0094] In the first determination step, the control unit 17 determines whether the laminated core 1 is acceptable based on the protrusion amount H, fusion width W, and fusion depth D acquired in the first weld portion measurement step. That is, it is determined whether the protrusion amount H, fusion width W, and fusion depth D of each weld portion 5 meet the criteria. If all of the criteria are met, the laminated core 1 is determined to be acceptable, and the next reversal step is performed.

[0095] On the other hand, if the protrusion amount H, the fusion width W, and the fusion depth D of each weld 5 do not meet the standards, the laminated core 1 is judged as a defective product. The laminated core 1 judged as a defective product is separated from the good products by being discharged from the defective product discharge port.

[0096] In the inversion step, after the first weld portion measuring step is completed, that is, after the protrusion amount H of one axial end surface 1 a of the laminated core 1 is measured, the laminated core 1 is inverted and turned upside down.

[0097] In the reversal process, after the first weld portion measuring process, first, the base 11a of the rotating part 11 is moved to the reversal position. When the base 11a moves to the reversal position RP, the gripping part 15 descends, and the laminated core 1 is positioned between the arms 15a of the gripping part 15. In this state, the gripping part 15 grips the laminated core 1 with the arms 15a.

[0098] The gripping part 15 holding the laminated core 1 is raised to a predetermined raised position and reversed at the raised position. The laminated core 1 is thereby turned upside down. In this state, the gripping part 15 is lowered and the reversed laminated core 1 is placed on the rotating plate 11b. Thereafter, when the gripping part 15 releases the laminated core 1 and rises to the initial position, the base 11a of the rotating part 11 moves to the measurement position MP.

[0099] The second weld measurement step and the second determination step together constitute a second inspection step. In the second weld measurement step, similarly to the first weld measurement step, the protrusion amount H, the fusion width W, and the fusion depth D of the weld 5 are measured from the axial direction on the other axial end face 1a while the laminated core 1 is rotated in the circumferential direction.

[0100] In the second determination process, similar to the first determination process, the control unit 17 determines whether the laminated core 1 is acceptable based on the protrusion amount H, the fusion width W, and the fusion depth D acquired in the second welding portion measuring process. If the laminated core 1 is determined to be acceptable, the laminated core 1 is conveyed to the next process in the manufacturing line. On the other hand, if the laminated core 1 is determined to be unacceptable, the laminated core 1 is separated from acceptable products by being discharged from an unacceptable product discharge port, etc.

[0101] As described above, in this embodiment, the protrusion amount H of the welded portion 5 can be inspected with high accuracy and at high speed.

[0102] Example 2

[0103] Fig.10 This is a side view showing a schematic structure of a repair device according to a second embodiment of the present invention. Fig.11 It is shown together with the measuring part and the laser irradiation part. Fig.10 The measurement of the welded portion and the cross-sectional view of the rotating portion during repair. In addition, the basic structure of the second embodiment is common to the first embodiment, so the same symbols are marked on the structures corresponding to the first embodiment and repeated descriptions are omitted.

[0104] When the protrusion amount H of the weld 5 exceeds the reference, the repair device 19 of the second embodiment irradiates the protrusion 5a of the weld 5 with laser from the axial direction to make the protrusion amount H within the reference range. Therefore, the repair device 19 includes the laser irradiation unit 21 in addition to the inspection device 7 of the first embodiment.

[0105] The laser irradiation unit 21 includes a CO 2 Laser oscillator such as laser, YAG laser, etc. The laser irradiation unit 21 of the present embodiment is arranged to face the end surface 1a of the laminated core 1 located at the measurement position MP from above in the up-down direction (axial direction).

[0106] Thus, the laser irradiation unit 21 can irradiate the same end surface 1 a of the laminated core 1 as the welded portion 5 to be measured with laser light in parallel with the measurement of the protrusion amount H by the three-dimensional measuring unit 13 .

[0107] The welded portion 5 does not refer to only the welded portion 5 actually being measured, but also includes the welded portion 5 that is not measured itself but is the object of measurement. The parallel operation includes not only the case where the measurement of the protrusion amount H and the laser irradiation are performed simultaneously, but also the case where the measurement of the protrusion amount H and the laser irradiation are performed at different times. In addition, the laser irradiation unit 21 may be provided outside the measurement position MP, and the laminated core 1 after the measurement of the protrusion amount H is completed may be separately irradiated with laser.

[0108] In this embodiment, the laser irradiation unit 21 is arranged 180 degrees away from the three-dimensional measuring unit 13 in the circumferential direction. However, the arrangement of the laser irradiation unit 21 and the three-dimensional measuring unit 13 is not limited thereto, and can be appropriately arranged according to the sizes of the laser irradiation unit 21 and the three-dimensional measuring unit 13.

[0109] The rest is the same as Example 1.

[0110] Fig.12 (A) to (C) are process diagrams showing a method for repairing a laminated core. Fig.12 (A) shows the whole process, Fig.12(B) shows Fig.12 Details of the first repairing step of (A), Fig.12 (C) shows Fig.12 Details of the second repairing step of (A).

[0111] The repair method of the laminated core 1 of the present embodiment performs the laser irradiation step based on the determination results of the first determination step and the second determination step.

[0112] In this embodiment, the protrusion H of the weld 5 on the two end faces 1a of the laminated iron core 1 can be repaired by a first repair process having a first weld measurement process, a first judgment process and a laser irradiation process and a second repair process having a second weld measurement process, a second judgment process and a laser irradiation process.

[0113] That is, Fig.12 As shown in (B) and (C) of FIG. 1 , the protrusion amount H of the weld 5 relative to the end face 1a of the laminated core 1 is measured in the first and second weld measuring steps, and whether the protrusion amount H, the fusion width W, and the fusion depth D of the weld 5 are within the reference range is determined in the first and second determination steps. In the laser irradiation step, the laser irradiation unit 21 irradiates the weld 5 whose protrusion amount H exceeds the reference with laser.

[0114] Thus, the protrusion amount H of the weld 5 is eliminated or reduced, and the protrusion amount H is within the reference range. In addition, when the molten width W or the molten depth D of the weld 5 does not meet the reference, the laminated core 1 is judged as a defective product and is separated from the qualified products by being discharged from the defective product discharge port.

[0115] Specifically, in each of the first and second repairing steps, the welded portion 5 of the laminated core 1 located at the measurement position MP is measured by the three-dimensional measuring unit 13, and the measured welded portions 5 are judged sequentially. Then, on the same end surface 1a as the welded portion 5 measured sequentially, the welded portion 5 whose protrusion amount H exceeds the reference is irradiated with laser in parallel with the measurement of the protrusion amount H of the other welded portions 5.

[0116] Therefore, the measurement time of the three-dimensional measuring unit 13 can be utilized for laser irradiation, and the production cycle can be improved. In addition, laser irradiation can be performed while the welded portion 5 is measured, and the repair accuracy by laser irradiation can be stabilized.

[0117] The protrusion amount H is measured again for the repaired welded portion 5. Unless the protrusion amount H is within the reference range, laser irradiation is performed and repair is repeated.

[0118] Example 3

[0119] Fig.13 This is a block diagram showing a repair device according to a third embodiment of the present invention. Fig.14 It is shown Fig.13 A part of the schematic structure of the inspection device is a side view of a cross section. In addition, the basic structure of the third embodiment is common to the second embodiment, so the same symbols are marked on the corresponding structures of the first embodiment and repeated descriptions are omitted.

[0120] The repairing device 19 of the third embodiment provides a reversing position RP between two measuring positions MP to transport the laminated core 1 in one direction through the measuring position MP and the reversing position RP. In this embodiment, the base 11a of the rotating part 11 reciprocates between the measuring position MP and the reversing position RP.

[0121] The base 11a may be shared by the rotating parts 11 of the two measurement positions MP, and the base 11a may be moved from the measurement position MP on the upstream side in the conveying direction to the measurement position MP on the downstream side through the reversing position RP. Furthermore, the base 11a may be configured as a plate with the laminated core 1 placed on the periphery, and the laminated core 1 may be conveyed in a circular shape according to the rotation of the base 11a. Furthermore, a second reversing position RP may be provided at a position further downstream than the measurement position MP on the downstream side.

[0122] Similar to the second embodiment, the rotating unit 11 , the three-dimensional measuring unit 13 , and the laser irradiation unit 21 are provided at each measurement position MP, and the gripping unit 15 is provided at the reversal position RP.

[0123] Therefore, in this embodiment, in the upstream side in the conveying direction, in a state where the base 11a of the rotating unit 11 is located at the measuring position MP, the first weld portion measuring step is performed in the same manner as in Embodiment 2. That is, the protrusion amount H, the fusion width W, and the fusion depth D of the weld portion 5 are measured on one end surface 1a of the laminated core 1 on the rotating plate 11b of the rotating unit 11.

[0124] When the protrusion amount H exceeds the reference, the laser irradiation step is performed to perform repair by laser irradiation. When the fusion width W or the fusion depth D exceeds the reference, the laminated core 1 is separated from the good products by being discharged from the bad product discharge port.

[0125] After all the welded portions 5 are measured and laser correction is performed as necessary, the laminated core 1 is conveyed to the reversing position RP.

[0126] That is, the base 11a of the rotating part 11 on the upstream side moves to the reversal position RP, and the laminated core 1 is gripped by the gripping part 15 and performs a reversal operation similar to Example 1. During this reversal operation, the base 11a of the rotating part 11 on the upstream side retreats to the measuring position MP, and the base 11a of the rotating part 11 on the downstream side enters the reversal position RP and takes over the laminated core 1 after the reversal.

[0127] Thereafter, the laminated core 1 is conveyed to the measurement position MP on the downstream side in the conveying direction. At the measurement position MP, the second weld portion measurement step is performed to measure the protrusion H, fusion width W, and fusion depth D of the weld portion 5 on the other end surface 1a of the laminated core 1.

[0128] When the protrusion amount H exceeds the reference, the laser irradiation step is performed to perform repair by laser irradiation. When the fusion width W or the fusion depth D exceeds the reference, the laminated core 1 is separated from the good products by being discharged from the bad product discharge port.

[0129] In the third embodiment, in addition to achieving the same effects as those of the first and second embodiments, the first weld portion measuring step, the reversing step, and the second weld portion measuring step can be performed in parallel on different laminated cores 1, thereby improving the production tact time.

[0130] Explanation of symbols

[0131] 1—laminated core, 1a—end face, 3—core sheet, 3a—protrusion, 5—welding portion, 7—inspection device, 9—dimension measuring portion, 11—rotation portion, 13—three-dimensional measuring portion (measuring portion, measuring source), 15—holding portion, 19—repairing device, 21—laser irradiation portion.

Claims

1. A method for inspecting a laminated core, wherein the laminated core is formed by stacking a plurality of annular core sheets in an axial direction and is provided with a plurality of circumferential welding portions reaching end surfaces formed by the core sheets at the ends in the axial direction, wherein the method for inspecting the laminated core is characterized in that: rotating the laminated core in the circumferential direction; As the laminated core rotates, protrusion amounts of the plurality of welded portions in the axial direction relative to the end surface are continuously measured from the axial direction.

2. The method for inspecting a laminated core according to claim 1, It is characterized in that The protrusion amount is measured, and dimensions of the welded portion in the circumferential direction and radial direction of the laminated core are three-dimensionally measured.

3. The method for inspecting a laminated core according to claim 1, It is characterized in that After the protrusion amount is measured for one end face in the axial direction of the laminated core, the laminated core is inverted and the protrusion amount is measured for the other end face in the axial direction.

4. The method for inspecting a laminated core according to claim 1, It is characterized in that The axial dimension of the laminated core is measured before measuring the protrusion amount, and the axial position of the laminated core is relatively adjusted based on the measured dimension so that a measurement source for the measurement and the end surface are constant in the axial direction.

5. A method for repairing a laminated core, using the method for inspecting a laminated core according to any one of claims 1 to 4, wherein the method for repairing a laminated core is characterized in that: When the protrusion amount exceeds a reference, a laser is irradiated from the axial direction to a protruding portion of the weld portion protruding from the end surface in the axial direction so that the protrusion amount falls within the range of the reference.

6. The method for repairing a laminated core according to claim 5, It is characterized in that The irradiation of the laser beam is performed on the same end surface of the laminated core as the welded portion where the measurement is performed, in parallel with the measurement of the protrusion amount.

7. An inspection device for a laminated core, wherein the laminated core is formed by stacking a plurality of annular core sheets in an axial direction and is provided with a plurality of circumferential welding portions reaching end surfaces formed by the core sheets at the ends in the axial direction, the inspection device for the laminated core comprising: a rotating portion that supports the laminated core so as to rotate in the circumferential direction; and The measuring portion is arranged opposite to the end surface of the rotating laminated core in the axial direction, and continuously measures the protrusion amounts of the plurality of welding portions relative to the opposing end surfaces in the axial direction from the axial direction as the laminated core rotates.

8. The inspection device for laminated core according to claim 7, It is characterized in that The measuring unit measures the protrusion amount and three-dimensionally measures dimensions of the welded portion in the circumferential direction and radial direction of the laminated core.

9. The inspection device for laminated core according to claim 7, It is characterized in that A holding portion is provided for holding the laminated core to reverse it. After the protrusion amount is measured by the measuring unit on one end face in the axial direction, the laminated core is reversed by the holding unit, and the protrusion amount is measured by the measuring unit on the other end face in the axial direction.

10. The inspection device for laminated core according to claim 7, It is characterized in that A dimension measuring unit for measuring the dimension of the laminated core in the axial direction is provided, The rotating portion or the measuring portion is moved in the axial direction so that the distance between the measuring portion and the end surface is constant in the axial direction based on the measured dimension, thereby relatively adjusting the position of the laminated core in the axial direction.

11. A laminated core repairing device using the laminated core inspection device according to any one of claims 7 to 10, wherein the laminated core repairing device is characterized in that: A laser irradiation unit is provided, and when the protrusion amount exceeds a reference, the laser irradiation unit irradiates a laser from the axial direction to a protruding portion of the weld portion protruding from the end surface in the axial direction so that the protrusion amount falls within the range of the reference.

12. The laminated core repairing device according to claim 11, It is characterized in that The laser irradiation section is disposed opposite to the end surface of the laminated core in the axial direction, and the laser irradiation is performed on the same end surface of the laminated core as the welded portion to be measured in parallel with the measurement of the protrusion amount.

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