JP2022115565A - Manufacturing method of lamination iron core, lamination iron core, and press working device - Google Patents

Abstract

To provide a manufacturing method of a lamination iron core, the lamination iron core, and a press working device, capable of suppressing deformation of a projection part when performing a press working.SOLUTION: A manufacturing method of a lamination iron core by laminating a plurality of punching members, comprises: a main part 21 structuring a main body of the lamination iron core; and a projection part 22 which is projected from the main part, and has a long shape of the length of the projection longer than a width of the narrowest part of a base end part. The method contains steps of: punching at least a first part R1 of a circumference region including the first part R1 that is a circumference region surrounding a region corresponded to a projection part of a metal board MS, and is opposite to one side edge of the projection part, and a second part R3 which is opposite to the other side edge of the projection part with a first punching; and of forming the projection part by punching a remaining part of the circumference region of the metal plate with a second punching. The second punching contains an engagement part engaged with a part containing a tip end edge of the projection part when punching the metal plate.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD The present disclosure relates to a laminated core manufacturing method, a laminated core, and a press working apparatus.

Patent Literature 1 discloses a rotor that constitutes a surface permanent magnet (SPM) motor. The rotor includes a laminated core configured by laminating a plurality of magnetic plates, and a plurality of magnets. The laminated core includes multiple ridges for positioning multiple magnets. The plurality of ridges extend along the lamination direction of the plurality of magnetic plates, and are arranged on the outer peripheral surface of the laminated core at predetermined intervals along the circumferential direction of the laminated core. Each magnet is arranged on the outer peripheral surface of the laminated core so as to be positioned between adjacent ridges in the circumferential direction of the laminated core.

Japanese Patent Application Laid-Open No. 2001-309588

By the way, when it is attempted to form the protruding portions constituting the ridges in the rotor of Patent Document 1 by press working, the elongated portions may be deformed by the force acting from the punch.

Accordingly, the present disclosure describes a method for manufacturing a laminated core, a laminated core, and a press working apparatus capable of suppressing deformation of protrusions during press working.

An example of a method for manufacturing a laminated core includes: a main portion constituting a main body of a laminated core; It may be a method of manufacturing a laminated core by laminating a plurality of punched members including. An example of a method for manufacturing a laminated core includes: a first portion facing one side edge of the protrusion, and punching at least the first portion of the peripheral region including the second portion facing the and the third portion facing the tip edge of the protrusion with a first punch; punching the remainder of the region with a second punch to form the protrusion. The second punch may include an engaging portion configured to engage with a portion including the tip edge of the projection during punching of the metal plate.

According to the method for manufacturing a laminated core, the laminated core, and the pressing apparatus according to the present disclosure, it is possible to suppress deformation of the protruding portion during pressing.

FIG. 1 is a perspective view showing an example of a rotor laminated core. FIG. 2(a) is a top view showing a punched member constituting the rotor laminated core of FIG. is a top view showing. FIG. 3 is a schematic diagram showing an example of a rotor laminated core manufacturing apparatus. FIG. 4(a) is a plan view showing an example of a first punch for forming a protrusion, and FIG. 4(b) is a plan view showing an example of a second punch for forming a protrusion. It is a diagram. FIG. 5 is a diagram showing an example of a layout for forming the punched member of FIG. 2(a) from a metal plate by press working. FIG. 6 is a perspective view showing an example of a laminated stator core. FIG. 7 is a top view showing punched members forming the stator laminated core of FIG. FIG. 8(a) is a plan view showing an example of a first punch for forming protrusions (teeth), and FIG. 8(b) is a first punch for forming protrusions (teeth). 2 is a plan view showing an example of punches No. 2. FIG. FIGS. 9(a) and 9(b) are plan views showing other examples of the second punch for forming protrusions.

In the following description, the same reference numerals will be used for the same elements or elements having the same functions, and redundant description will be omitted. In this specification, the top, bottom, right, and left of the drawings are based on the directions of the symbols in the drawings.

[Configuration of rotor laminated core]
First, the configuration of a rotor laminated core 1 (laminated core) will be described with reference to FIGS. 1 and 2. FIG. The rotor laminated core 1 is part of a rotor that constitutes a surface permanent magnet type motor. Rotor laminated core 1 includes laminated bodies 10 and a plurality of permanent magnets MG, as illustrated in FIG.

The laminate 10 includes a tubular (for example, cylindrical) body 11 and a plurality of ridges 12 . A central portion of the main body 11 is provided with an axial hole 11a passing through the main body 11 so as to extend along the central axis Ax. The shaft hole 11a extends in the height direction (vertical direction or stacking direction) of the main body 11 . Since the main body 11 rotates around the central axis Ax, the central axis Ax is also the axis of rotation.

A plurality of ridges 12 are provided on the outer peripheral surface of the main body 11 . The plurality of ridges 12 extend in the height direction from the upper end surface of the main body 11 to the lower end surface. The ridge 12 protrudes radially outward of the main body 11 from the outer peripheral surface of the main body 11 . The number of protrusions 12 may be two or more. The plurality of ridges 12 may be arranged at predetermined intervals (for example, approximately equal intervals) in the circumferential direction of the main body 11 .

The laminate 10 is configured by stacking a plurality of punched members 20 . The punched members 20 adjacent to each other in the stacking direction may, for example, be fastened to each other by caulking, or may be joined to each other by an adhesive, a resin material, welding, or the like.

The punched member 20 is a plate-like body obtained by punching a metal plate MS (for example, an electromagnetic steel sheet) described later into a predetermined shape, and has a shape corresponding to the laminate 10 . That is, as illustrated in FIG. 2( a ), the punching member 20 has an annular shape as a whole and includes a main portion 21 corresponding to the main body 11 and a projecting portion 22 corresponding to the ridge 12 . . A through hole 21a corresponding to the shaft hole 11a is formed in the main portion 21 .

As shown in detail in FIG. 2B, the projecting portion 22 projects radially outward from the main portion 21 from the outer peripheral edge of the main portion 21 . The projecting portion 22 has an elongated shape in which the projecting length is longer than the width of the narrowest portion of the base end portion 22a. The protruding length of the protruding portion 22 may be set to, for example, twice or more the width of the narrowest portion of the base end portion 22a. The width of the narrowest portion of the base end portion 22a may be set, for example, to five times or less the plate thickness of the punched member 20 (metal plate MS).

Projection 22 includes a pair of side edges L1 and L2 extending along the longitudinal direction, and a tip edge L3 connecting tip ends L1a and L2a of side edges L1 and L2.

A tip L1a of the side edge L1 and one end L3a of the tip edge L3 form a left corner portion CR1 of the projecting portion 22 . In the example of FIG. 2(b), the tip L1a and the one end L3a are both linear and connected so as to intersect. Therefore, the left corner CR1 is discontinuous at the point where the tip L1a and the one end L3a intersect. That is, the left corner CR1 is an obtuse angle. As exemplified in FIG. 2(b), when an angle formed by a virtual line passing through the center of the tip edge L3 and a virtual line passing through the one end L3a is defined as the tilt angle θ of the one end L3a, the tilt angle θ is It may be 10° or more and may be 80° or less.

A tip L2a of the side edge L2 and the other end L3b of the tip edge L3 form a right corner CR2 of the projecting portion 22. As shown in FIG. In the example of FIG. 2(b), the tip L2a and the other end L3b are both arc-shaped and are continuously connected. Therefore, the right corner CR2 as a whole also exhibits a continuous arc shape without steps.

The laminate 10 may be configured by so-called transpiling. “Rolling” means stacking a plurality of punched members 20 while shifting the angles of the punched members 20 relatively. Rolling is performed mainly for the purpose of canceling the plate thickness deviation of the punched member 20 and increasing the flatness, parallelism and perpendicularity of the laminate 10 . The rotation angle may be set to any size.

The plurality of permanent magnets MG are arranged one by one between a pair of ridges 12 adjacent in the circumferential direction of the main body 11 . The permanent magnets MG may be attached to the outer peripheral surface of the main body 11 by, for example, an adhesive. The permanent magnet MG may have a shape (for example, an arc shape) along the outer peripheral surface of the main body 11 . The type of permanent magnet MG may be determined according to the application of the motor, required performance, etc. For example, it may be a sintered magnet or a bonded magnet.

[Press processing equipment]
Next, the press working apparatus 100 will be described with reference to FIGS. 3 and 4. FIG. The press working device 100 is configured to form a plurality of punched members 20 by press working (for example, cutting, punching, etc.) on a strip-shaped metal plate MS that is intermittently sent out in one direction. ing. The press working apparatus 100 is configured to form a laminate 10 by sequentially laminating a plurality of punched members 20 obtained by press working. The plate thickness of metal plate MS may be, for example, about 0.1 mm to 1.0 mm.

The press working apparatus 100 includes a lower die 110, an upper die 120, and a press machine 130, as illustrated in FIG. Lower die 110 includes die holder 111 and die plate 112 .

The die holder 111 is configured to support a die plate 112 and the dies D1-D4 held thereon. The die holder 111 is formed with a plurality of discharge holes C1 to C4 extending in the vertical direction.

The die plate 112 is configured to press the metal plate MS together with a plurality of punches P1-P4. Die plate 112 includes a plurality of dies D1-D4. The dies D1-D4 are arranged at positions corresponding to the punches P1-P4, respectively, and include die holes D1a-D4a through which the corresponding punches P1-P4 can be inserted. The dies D1 to D4 are arranged in this order from the upstream side to the downstream side in the conveying direction of the metal plate MS.

The die D1 constitutes a first processing unit for pressing the metal plate MS together with the punch P1 (first punch). Details of the first processing unit will be described later. The metal piece punched out from the metal plate MS by the first processing unit is discharged through the discharge hole C1.

The die D2 constitutes, together with the punch P2, a second processing unit for pressing the metal plate MS. The second processing unit is configured to form the through holes 21 a of the punched member 20 . The metal piece punched out from the metal plate MS by the second processing unit is discharged through the discharge hole C2.

The die D3 constitutes a third processing unit for pressing the metal plate MS together with the punch P3 (second punch). Details of the third processing unit will be described later. The metal piece punched out from the metal plate MS by the third processing unit is discharged through the discharge hole C3.

The die D4 constitutes a fourth processing unit for pressing the metal plate MS together with the punch P4. The fourth processing unit is configured to punch out the outer shape of the punching member 20 from the metal plate MS. A plurality of punched members 20 punched out from the metal plate MS by the fourth processing unit are stacked inside the discharge hole C4. Thereby, the laminated body 10 is formed in the discharge hole C4. After that, the laminate 10 is conveyed to subsequent steps by the conveyor Cv.

The upper die 120 includes a punch holder 121, a stripper 122 and a plurality of punches P1-P4. The punch holder 121 is arranged above the die plate 112 so as to face it. The punch holder 121 is configured to hold a plurality of punches P1 to P4 on its bottom side.

The punch holder 121 is provided with a plurality of guide posts 125 linearly extending downward from the punch holder 121 . The guide post 125 is configured to guide the upper die 120 in the vertical direction together with a guide bush (not shown) provided on the die holder 111 . The punch holder 121 is provided with a plurality of through holes 121a. A stepped step is formed on the inner peripheral surface of the through hole 121a.

The stripper 122 is configured to remove the metal plate MS bitten by the punches P1 to P4 from the punches P1 to P4 when the metal plate MS is pressed by the punches P1 to P4. A stripper 122 is arranged between the die plate 112 and the punch holder 121 . The stripper 122 is provided with through holes at positions corresponding to the punches P1 to P4. The lower portions of the punches P1-P4 are each slidable within the corresponding through-holes.

The stripper 122 is connected with the punch holder 121 via the connecting member 123 . The connection member 123 is inserted through the through hole 121a, and the head portion of the connection member 123 is configured to be able to be locked to the stepped portion of the through hole 121a. Therefore, the connection member 123 suspends and holds the stripper 122 from the punch holder 121 . An urging member 124 (for example, a compression coil spring) configured to apply an urging force to the punch holder 121 and the stripper 122 in a direction to separate them is attached around the connecting member 123. good.

The press machine 130 is configured to move the upper die 120 up and down. The press 130 includes a crankshaft 131 connected to the punch holder 121 and a drive mechanism 132 configured to rotate the main shaft of the crankshaft 131 . When the drive mechanism 132 rotates the main shaft of the crankshaft 131, the eccentric shaft of the crankshaft 131 circularly moves around the main shaft. Along with this, the punch holder 121 reciprocates vertically between the top dead center and the bottom dead center.

Here, the punch P1 of the first processing unit described above will be described in more detail with reference to FIG. 4(a). The punch P1 is configured to punch out a part of the peripheral region of the region to be the projecting portion 22 of the metal plate MS. More specifically, the punch P1 is configured to punch a portion of the peripheral region that faces the side edge L1 of the projecting portion 22 . Therefore, the metal plate MS after being processed by the punch P1 is formed with a through hole including a portion of the protruding portion 22 that becomes the side edge L1. That is, the punch P1 includes a portion P1a having a shape corresponding to the side edge L1. Note that the press working apparatus 100 may include the same number of first working units as the plurality of protrusions 22 . Alternatively, a plurality of protrusions for processing the side edges L1 of the plurality of protrusions 22 may be provided on the tip surface of the punch P1.

The punch P3 of the third processing unit described above will be described in more detail with reference to FIG. 4(b). The punch P3 is configured to punch out the remaining portion of the metal plate MS that is not punched by the punch P1 and which is a peripheral region of the region that will become the projecting portion 22 . More specifically, the punch P3 is configured to punch a portion of the peripheral region that faces the side edge L2 and the tip edge L3 of the projecting portion 22 . Therefore, the protrusions 22 are formed in the metal plate MS after being processed by the punch P3. That is, the punch P3 includes an engagement portion P3a having a shape corresponding to the side edge L2 and the tip edge L3. In other words, one end L3a of the leading edge L3 has a predetermined inclination angle θ, so that the engaging portion P3a has a hook shape that engages with the left corner portion CF1 of the protruding portion 22. As shown in FIG. Note that the press working apparatus 100 may include the same number of third working units as the plurality of protrusions 22 . Alternatively, a plurality of protrusions for processing the side edges L2 and the tip edges L3 of the plurality of protrusions 22 may be provided on the tip surface of the punch P3.

[Manufacturing method of rotor laminated core]
Next, a method for manufacturing the rotor laminated core 1 will be described with reference to FIG.

When the metal plate MS is intermittently sent to the press processing device 100 and a predetermined portion of the metal plate MS reaches the first processing unit, the press machine 130 operates to move the upper die 120 up and down. When the upper die 120 descends, the metal plate MS is pulled by the die plate 112 and the stripper 122, and the lower end of the punch P1 punches the metal plate MS and reaches the die hole D1a. Thereby, a plurality of through holes R1 are formed in the metal plate MS (see position X1 in FIG. 5).

The plurality of through holes R1 are arranged so as to form a circle as a whole. Through hole R1 is a part of the peripheral area of the area of metal plate MS that becomes projecting portion 22 and corresponds to a portion (first portion) facing side edge L1 of projecting portion 22 .

Next, when the metal plate MS is sent out intermittently and a predetermined portion of the metal plate MS reaches the second processing unit, the upper die 120 is moved up and down by the press machine 130 in the same manner as described above, and the punches P2 and The metal plate MS is punched by the die D2. Thereby, a circular through hole R2 is formed (see position X2 in FIG. 5). The through hole R2 has a shape corresponding to the through hole 21a of the punched member 20. As shown in FIG.

Next, when the metal plate MS is sent out intermittently and a predetermined portion of the metal plate MS reaches the third processing unit, the upper mold 120 is moved up and down by the press machine 130 in the same manner as described above, and the punches P3 and The metal plate MS is punched by the die D3. Thereby, a plurality of through holes R3 are formed in the metal plate MS (see position X3 in FIG. 5). When the punch P3 punches the metal plate MS, the engaging portion P3a of the punch P3 engages with the left corner portion CF1 of the projecting portion 22 (see FIG. 4B).

The plurality of through holes R3 are arranged in a circular shape as a whole, as illustrated in FIG. The through-holes R3 are formed in portions (second and third portions) of the metal plate MS, which are the remainder of the peripheral region of the region to be the projecting portion 22 and face the side edge L2 and the tip edge L3 of the projecting portion 22. Yes. Through hole R3 partially overlaps with through hole R1. That is, after the through-hole R3 is formed in the metal plate MS, the through-holes R1 and R3 are integrated to form a larger through-hole R4 in the metal plate MS. A portion of the peripheral edge of the through hole R4 constitutes the projecting portion 22. As shown in FIG.

Next, when the metal plate MS is sent out intermittently and a predetermined portion of the metal plate MS reaches the fourth processing unit, the press machine 130 moves the upper die 120 up and down in the same manner as described above, and the punches P4 and The metal plate MS is punched by the die D4. Thereby, a through hole R5 is formed in the metal plate MS (see position X4 in FIG. 5). The through holes R5 are arc-shaped and connect the through holes R4 that are adjacent to each other in the circumferential direction of the through holes 21a. As a result, the portion to be the main portion 21 of the punched member 20 is separated from the metal plate MS. As a result, the stamped member 20 is formed.

The punched member 20 that has been punched is stacked on the previously punched punched member 20 in the die hole D4a. When a predetermined number of punched members 20 are stacked in the die hole D4a, the laminate 10 is formed. After the laminated body 10 is formed by the press working device 100, the laminated body 10 is conveyed to a magnet mounting device (not shown) by the conveyor Cv. The rotor laminated core 1 is completed by attaching the permanent magnets MG to the outer peripheral surface of the laminate 10 in the magnet attachment device.

[Action]
According to the above example, when the punch P3 punches the metal plate MS, the engaging portion P3a of the punch P3 engages with the left corner portion CF1 of the projecting portion 22 (see FIG. 4B). Therefore, when the punch P3 moves up and down, the engaging portion P3a of the punch P3 holds the projecting portion 22 in its width direction. Therefore, even if a lateral pressure is applied from the punch P3 to the projecting portion 22, deformation of the projecting portion 22 can be suppressed.

According to the above example, the engaging portion P3a of the punch P3 has a hook shape configured to engage with the left corner portion CF1 of the protruding portion 22 . Therefore, when the punch P3 moves up and down, the engaging portion P3a of the punch P3 engages with the corner portion of the protruding portion 22, so that the protruding portion 22 is held more effectively by the engaging portion P3a of the punch P3. Therefore, deformation of the projecting portion 22 can be further suppressed.

According to the above example, the protruding length of the protruding portion 22 can be set to be twice or more the width of the narrowest portion of the base end portion 22a. In this case, the protruding portion 22 has a relatively long protruding length relative to the width of the base end portion 22a, and the protruding portion 22 tends to bend in the width direction. It's becoming However, as described above, the deformation of the projecting portion 22 can be suppressed by the engaging portion P3a of the punch P3.

According to the above example, the width of the narrowest portion of the base end portion 22a can be set to five times or less the plate thickness of the punched member 20 . In this case, the width of the narrowest portion of the base end portion 22a is relatively small, and the projection portion 22 is easily bent at the base end portion 22a, so the projection portion 22 is easily affected by the side pressure from the punch P3. However, as described above, the deformation of the projecting portion 22 can be suppressed by the engaging portion P3a of the punch P3.

According to the above example, the plate thickness of the punched member 20 can be set to approximately 0.1 mm to 1.0 mm. In this case, since the plate thickness is small and the base end portion 22a of the projecting portion 22 is likely to bend, the projecting portion is easily affected by the side pressure from the second punch. However, as described above, the deformation of the projecting portion 22 can be suppressed by the engaging portion P3a of the punch P3.

[Modification]
The disclosure herein should be considered illustrative and not restrictive in all respects. Various omissions, substitutions, modifications, etc. may be made to the above examples without departing from the scope and spirit of the claims.

(1) This technique may be applied not only to the rotor laminated core 1 but also to the stator laminated core. The laminated stator core may be a split-type laminated stator core formed by combining a plurality of core pieces, or may be a non-split-type laminated stator core. An example of an undivided laminated stator core is one in which a plurality of teeth are provided in one yoke, and the yoke is bent between the teeth to make the yoke as a whole annular. It may be laminated.

Another example of the undivided laminated stator core may be one in which a plurality of toroidal punched members are laminated. Here, another example of the non-split type laminated stator core will be described with reference to FIGS. 6 to 9. FIG.

First, the configuration of the stator laminated core 2 (laminated core) will be described with reference to FIG. The stator laminated core 2 has a cylindrical shape as a whole. A central portion of laminated stator core 2 is provided with a through hole 2a penetrating through laminated stator core 2 so as to extend along central axis Ax. The through-holes 2a extend in the height direction (vertical direction or lamination direction) of the stator laminated core 2 . A rotor can be arranged in the through hole 2a.

Stator laminated core 2 includes a yoke portion 3 and a plurality of tooth portions 4 . The yoke portion 3 has an annular shape and extends so as to surround the central axis Ax. In the example shown in FIG. 6 , the teeth 4 protrude inward from the inner edge of the yoke portion 3 and then extend arcuately along the inner edge of the yoke portion 3 . In the example shown in FIG. 6, the plurality of teeth 4 has an annular shape as a whole. Note that the plurality of teeth 4 may have shapes other than those illustrated in FIG. 6 . For example, the plurality of tooth portions 4 may not be along the inner edge of the yoke portion 3, may have a linear shape, or may have a shape in which an arc shape and a linear shape are combined.

The laminated stator core 2 is a laminate in which a plurality of punched members 30 are stacked. The stator laminated core 2 may be configured by so-called rolling.

The punched member 30 is a plate-like body obtained by punching a metal plate MS into a predetermined shape, and has a shape corresponding to the laminated stator core 2 as illustrated in FIG. 7 . A through hole 30a is provided in the central portion of the punching member 30 . The punching member 30 has a yoke portion 31 corresponding to the yoke portion 3 and a plurality of teeth portions 32 (projections) corresponding to each tooth portion 4 .

The tooth portion 32 has an elongated shape in which the protruding length is longer than the width. The protruding length of the tooth portion 32 may be set to be, for example, twice or more the width. The width of the tooth portion 32 may be set, for example, to five times or less the thickness of the punched member 30 (metal plate MS).

The tooth portions 32 can be formed in the same manner as the protruding portions 22 of the rotor laminated core 1 . That is, the tooth portion 32 is formed by punching out the peripheral region of the tooth portion 32 in two steps using two punches P5 and P6 illustrated in FIG.

Specifically, as illustrated in FIG. 8A, the punch P5 (first punch) is configured to punch out a part of the peripheral region of the region of the metal plate MS that will become the tooth portion 32. ing. More specifically, the punch P5 is configured to punch out a portion of the peripheral region that faces one side edge of the tooth portion 32 . The punch P6 (second punch) punches the remaining portion of the metal plate MS which is not punched by the punch P5 and which is the peripheral region of the tooth portion 32, as illustrated in FIG. 8(b). is configured as More specifically, the punch P6 is configured to punch a portion of the peripheral region that faces the other side edge and tip edge of the tooth portion 32 . Therefore, teeth portions 32 are formed in the metal plate MS after being processed by the punch P6. That is, the punch P<b>6 includes an engagement portion P<b>6 a having a shape corresponding to the other side edge and tip edge of the tooth portion 32 .

As described above, in the case of the stator laminated core 2 as well, when the punch P6 punches the metal plate MS, the engaging portion P6a of the punch P6 engages with the corner portion of the tooth portion 32. As shown in FIG. Therefore, when the punch P6 moves up and down, the engaging portion P6a of the punch P6 holds the tooth portion 32 in its width direction. Therefore, even if a lateral pressure acts on the teeth portion 32 from the punch P6, deformation of the teeth portion 32 can be suppressed.

(2) As shown in FIG. 9(a), the punch P3 may include a convex portion P3b instead of the engaging portion P3a. The convex portion P3b is configured to form a concave portion 22b corresponding to the convex portion P3b at the leading end edge L3 of the projecting portion 22 when the punch P3 punches the metal plate MS. Therefore, when the punch P3 moves up and down, the protrusion P3b of the punch P3 engages with the recess 22b of the tip edge L3 of the protrusion 22, so that the protrusion 22 is more effectively held by the protrusion P3b of the punch P3. . Therefore, deformation of the projecting portion 22 can be further suppressed.

As shown in FIG. 9(b), the punch P3 may include a concave portion P3c instead of the engaging portion P3a. The concave portion P3c is configured to form a convex portion 22c corresponding to the concave portion P3c at the leading end edge L3 of the projecting portion 22 when the punch P3 punches the metal plate MS. Also in this case, deformation of the projecting portion 22 can be further suppressed. In addition, the punch P3 may include one or more of the engaging portion P3a, the convex portion P3b, and the concave portion P3c.

[Other examples]
Example 1. An example of a method for manufacturing a laminated core includes: a main portion constituting a main body of a laminated core; It may be a method of manufacturing a laminated core by laminating a plurality of punched members including. An example of a method for manufacturing a laminated core includes: a first portion facing one side edge of the protrusion, and punching at least the first portion of the peripheral region including the second portion facing the and the third portion facing the tip edge of the protrusion with a first punch; punching the remainder of the region with a second punch to form the protrusion. The second punch may include an engaging portion configured to engage with a portion including the tip edge of the projection during punching of the metal plate.

By the way, immediately after the second punch punches the remaining part of the peripheral region of the metal plate to form the protrusion, the second punch is pressed while the peripheral surface of the second punch is in contact with the other side edge of the protrusion. move up and down. At this time, a pressure (side pressure) directed from the second punch toward the through-holes already formed in the metal plate by the first punch (lateral pressure) acts from the second punch on the projecting portion. However, the second punch includes an engaging portion configured to engage with a portion including the tip edge of the projection during punching of the metal plate. Therefore, when the second punch moves up and down, the engaging portion of the second punch holds the projecting portion in its width direction. Therefore, even if a lateral pressure acts on the projecting portion from the second punch, deformation of the projecting portion can be suppressed.

Example 2. In the method of Example 1, the engaging portion may have a hook shape configured to engage with a corner portion where the leading edge and one side edge intersect. In this case, when the second punch moves up and down, the engaging portion of the second punch engages with the corner of the protrusion, so the protrusion can be held more effectively by the engaging portion of the second punch. be. Therefore, it is possible to further suppress deformation of the projecting portion.

Example 3. In the method of Example 1 or Example 2, the engaging portion may present a concave or convex shape configured to engage the leading edge. In this case, when the second punch moves up and down, the engaging portion of the second punch engages with the tip edge of the projecting portion, so that the engaging portion of the second punch holds the projecting portion more effectively. be. Therefore, it is possible to further suppress deformation of the projecting portion.

Example 4. In any one of the methods of Examples 1 to 3, the protrusion length of the protrusion may be twice or more the width of the narrowest portion of the proximal end portion of the protrusion. In this case, the projection length of the projection is relatively large with respect to the width of the narrowest portion of the base end of the projection, and the projection tends to bend in the width direction. It is easily affected by lateral pressure. However, as described in Example 1, it is possible to suppress the deformation of the projecting portion by the engaging portion of the second punch.

Example 5. In any of the methods of Examples 1 to 4, the width of the narrowest portion of the proximal end portion of the protrusion may be 5 times or less the plate thickness of the punched member. In this case, the width of the narrowest portion of the proximal end of the protrusion is relatively small, and the protrusion tends to bend at the proximal end, so the protrusion is susceptible to the side pressure from the second punch. . However, as described in Example 1, it is possible to suppress the deformation of the projecting portion by the engaging portion of the second punch.

Example 6. In the method of any of Examples 1-5, the thickness of the stamped member may be between 0.1 mm and 1.0 mm. In this case, since the plate thickness is small and the protruding portion is likely to bend at the base end portion, the protruding portion is easily affected by the side pressure from the second punch. However, as described in Example 1, it is possible to suppress the deformation of the projecting portion by the engaging portion of the second punch.

Example 7. An example of a laminated core includes a main portion that constitutes a main body of the laminated core, and a plurality of elongated protrusions that protrude from the main portion and have a protrusion length that is longer than the width of the narrowest portion of the base end portion. may be configured by stacking the punched members. The projecting portion may include a pair of side edges extending along the longitudinal direction of the projecting portion, and a tip edge connecting tip portions of the pair of side edges and formed with a concave portion or a convex portion. In this case, when the punching member is punched out of the metal plate by the punch, the concave portion or convex portion formed on the tip edge of the punching member engages with the punch. Therefore, as in the method of Example 1, when the punching member is punched, the projecting portion is held by the engaging portion of the punch in its width direction. Therefore, even if a lateral pressure acts on the projecting portion from the punch, deformation of the projecting portion can be suppressed.

Example 8. An example of a press working device includes a main portion that constitutes a main body of a laminated core, and an elongated protruding portion that protrudes from the main portion and has a protruding length that is longer than the width of the narrowest portion of the base end portion. The stamping member may be configured to be stamped from a metal sheet. An example of the press working device is a peripheral region surrounding a region corresponding to the protrusion in the metal plate, a first portion facing one side edge of the protrusion, and a first portion facing the other side edge of the protrusion. a first punch configured to punch at least a first portion of a peripheral region including a second portion facing the tip edge of the protrusion and a third portion facing the tip edge of the protrusion; and a second punch configured to punch out the remainder of the region to form the protrusion. The second punch may include an engaging portion configured to engage with a portion including the tip edge of the projection during punching of the metal plate. In this case, effects similar to those of the method of Example 1 are obtained.

DESCRIPTION OF SYMBOLS 1... Laminated rotor core (laminated core), 2... Laminated stator core (laminated core), 4... Teeth part (projection part), 10... Laminated body, 11... Main body, 12... Ridge, 20... Punched member , 21...main portion, 22...protruding portion, 22a...base end portion, 22b...recessed portion, 22c...protruding portion, 100...pressing device, CR1...left corner portion, L1, L2...side edge, L3...tip edge, MG... permanent magnet, MS... metal plate, P1... punch (first punch), P3... punch (second punch), P3a... engaging portion, P3b... convex portion (engaging portion), P3c... concave portion ( P5... Punch (first punch), P6... Punch (second punch), P6a... Engaging part.

Claims (8)

a plurality of punched members including a main portion that constitutes the main body of the laminated core; A method for manufacturing a laminated core by lamination,
A peripheral region surrounding a region of the metal plate corresponding to the protrusion, the first portion facing one side edge of the protrusion, and the second portion facing the other side edge of the protrusion. punching at least the first portion of a peripheral region including a portion and a third portion facing the tip edge of the protrusion with a first punch;
punching the remainder of the peripheral region of the metal plate with a second punch to form the protrusion;
The method for manufacturing a laminated core, wherein the second punch includes an engaging portion configured to engage with a portion including the tip edge of the projecting portion when punching the metal plate. 2. The method of claim 1, wherein the engaging portion has a hook shape configured to engage a corner where the leading edge and the one side edge intersect. 3. The method of claim 1 or 2, wherein the engaging portion presents a concave or convex shape configured to engage the leading edge. 4. The method according to any one of claims 1 to 3, wherein the protrusion length of the protrusion is twice or more the width of the narrowest portion of the proximal end of the protrusion. 5. The method according to any one of claims 1 to 4, wherein the width of the narrowest portion of the base end portion of the projecting portion is five times or less the thickness of the punched member. The method according to any one of claims 1 to 5, wherein the plate thickness of the punched member is 0.1 mm to 1.0 mm. A plurality of punched members including a main portion constituting a main body of a laminated core and elongated protruding portions protruding from the main portion and having a protruding length longer than the width of the narrowest portion of the base end portion. A laminated core configured by lamination,
The protrusion is
a pair of side edges extending along the longitudinal direction of the protrusion;
A laminated core, comprising: a tip end edge connecting the tip end portions of the pair of side edges and formed with a concave portion or a convex portion. A punched member comprising a main portion constituting a main body of a laminated core and a protruding portion protruding from the main portion and having an elongated shape whose protruding length is longer than the width of the narrowest portion of the base end portion is made of a metal plate. A press working device configured to punch from
A peripheral region surrounding a region corresponding to the protrusion of the metal plate, the first portion facing one side edge of the protrusion, and the second portion facing the other side edge of the protrusion. a first punch configured to punch at least the first portion of a peripheral region including a portion of and a third portion facing the tip edge of the protrusion;
a second punch configured to punch out the remainder of the peripheral region of the metal plate to form the protrusion;
The press working device, wherein the second punch includes an engaging portion configured to engage with a portion including the tip edge of the projecting portion when punching the metal plate.

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