JP7356159B2 - Manufacturing method for laminated products and laminated products - Google Patents

Description

The present invention relates to a method for manufacturing a laminated product and a laminated product.

BACKGROUND ART Conventionally, there has been a manufacturing method in which a plurality of plate-shaped parts (core plates) punched into a predetermined shape by press working are laminated and integrated to form a laminated product (laminated core). In a method for manufacturing such a laminated product, first, a dowel recess for caulking is formed on one side of a plate-shaped component, and a dowel convex portion is formed on the other side. Next, after fitting the dowel convex portion of the upper layer plate component into the dowel concave portion of the lower layer plate component, the conical punch tip is pressed to pierce the dowel concave portion of the upper layer plate component, and the lower layer side The dowel convex portion on the upper layer side is expanded in the radial direction within the dowel concave portion to connect the lower layer plate-like component and the lower layer plate-like component (see, for example, Patent Document 1).

Japanese Patent Application Publication No. 2000-125519

According to the method for manufacturing a laminated product, when pressing the bottom of the upper layer dowel recess with the tip of the punch, the upper layer dowel convex that fits into the lower layer side dowel recess swells in the radial direction. However, if the plate-shaped part is made of a thin plate material such as 0.3 mm, it is not possible to obtain a sufficient amount of bulge in the radial direction (i.e., tightness) even if the conical punch tip is pressed. First, there is the problem that sufficient bond strength cannot be obtained. Furthermore, since the punch is conical, the amount of bulge at the base of the punch is larger than at the tip. As a result, when the pressing force from the punch is released, the plate-shaped component warps. This warpage creates a gap between the upper layer plate-shaped component and the lower layer plate-shaped component, and warpage also occurs in the laminated product. In addition, as a countermeasure when warping occurs, it may be necessary to sandwich the laminated product between the top and bottom with flat plates and remove the gaps between the plate-shaped parts and the warp of the laminated product by flat hammering.

Therefore, the present invention was made to solve these problems, and it is possible to increase the bonding strength of plate-shaped parts between each layer and to suppress the occurrence of warping of plate-shaped parts and laminated products. The present invention aims to provide a method for manufacturing a laminated product and a laminated product.

[1] The method for manufacturing a laminated product of the present invention is a method for manufacturing a laminated product in which a plurality of plate-shaped parts are laminated and combined at a plurality of joints to be integrated, wherein a through hole is opened in the joint. the plate-shaped component in the lowermost layer, and the plate-shaped component in the upper layer than the plate-shaped component in the lowermost layer, which has a convex portion formed on one side and a circular convex portion on the other side. a plate-shaped component preparation step of preparing a component; and after fitting the convex portion of the upper layer plate-shaped component into the through hole of the lowermost layer plate-shaped component, a punch having a flat tip surface is formed. A first bonding step in which the convex portion is pressed until it becomes flat using a . After fitting the convex part of the plate-shaped component of the upper layer into the concave part, the punch is used to press the convex part until it becomes flat. The method is characterized by comprising a second joining step of forming the recess into which the projection of the upper plate-like component can fit.

[2] The method for manufacturing a laminated product of the present invention preferably includes a step of repeating the second bonding step until a predetermined number of laminated products is reached.

[3] In the method for manufacturing a laminated product of the present invention, in the plate-shaped component preparation step, the plate-shaped component in the upper layer is formed with the convex portion on one side of the plate-shaped component in the upper layer than the plate-shaped component in the lowest layer. It is preferable to form the circular convex part by extrusion and then half punching the periphery of the convex part to protrude the circular convex part from the other surface side.

[4] In the method for manufacturing a laminated product of the present invention, it is preferable that in the plate-shaped component preparation step, an annular flat portion is formed around the root portion of the convex portion.

[5] In the method for manufacturing a laminated product of the present invention, it is preferable that the diameters of the through holes and the recesses be larger than the diameters of the protrusions.

[6] In the method for manufacturing a laminated product of the present invention, it is preferable that the laminated product is a laminated core, and that the plate-shaped component constituting the laminated core is a core plate formed of an electromagnetic steel plate.

[7] The laminated product of the present invention is a laminated product in which a plurality of plate-like parts are joined at a plurality of joints, and the lowermost plate-like part has a through hole provided in the joint part. , the plate-shaped component in the lowermost layer has a convex portion on one side, and a circular convex portion is formed on the other side by half punching around the convex portion; a plate-shaped component, and the plate-shaped component of the upper layer is formed by pressing the convex part with the convex part fitted in the through hole. The plate-shaped part has a recess into which the convex part can fit, and the plate-shaped part arranged in a relatively lower layer and the plate-shaped part arranged in a relatively upper layer are arranged in a relatively lower layer. The plate-like parts are joined by pressing the protrusions in a state in which the protrusions of the plate-like parts arranged in a relatively upper layer are fitted to the arranged plate-like parts. do.

The method for manufacturing a laminated product of the present invention involves fitting the convex portion of the upper layer plate-like component into the through hole or recess of the lower layer plate-like component, and then pressing the convex portion from above with a punch having a flat end surface. By doing so, the convex portion is evenly spread radially within the through hole or the recess, thereby making it possible to increase the bonding strength between the upper layer plate member and the lower layer plate member. In addition, since the through hole and the concave part and the convex part are in a loose-fitting relationship, and an annular flat part is formed around the root of the convex part after half-blanking, it is possible to punch out the convex part with a punch. When pressed, the convex portion tries to spread radially evenly along the annular plane portion within the through hole or the concave portion, making it possible to suppress the occurrence of warping of the plate-shaped component.

According to such a method of manufacturing a laminated product, the bonding strength of the plate-like parts between each layer is increased by repeating the process of bonding the plate-like parts of the upper layer to the plate-like parts of the lower layer for the number of laminated pieces, and It is possible to suppress the occurrence of warpage in plate-shaped parts and laminated products.

In addition, the manufacturing method for laminated products as described above increases the bonding strength between core plates and suppresses the occurrence of warpage of the core plates by adopting this method for laminated cores such as motor stators and rotors. Since this is possible, multiple core plates can be brought close together, noise and vibration can be suppressed, and the efficiency of the magnetic circuit can be improved.

1 is a plan view showing one configuration example of a laminated product 10. FIG. FIG. 2 is an enlarged cross-sectional view of the laminated product 10 cut along the line AA in FIG. 1. FIG. FIG. 2 is a cross-sectional view showing a lowermost layer of plate-shaped components 11A and an upper layer of plate-shaped components 11B formed by a plate-shaped component preparation process. It is a sectional view showing a preparation process of plate-shaped component 11B. FIG. 3 is an explanatory diagram showing a first bonding step. It is an explanatory view showing a process of joining plate-like component 11C to plate-like component 11B combined with plate-like component 11A. It is an explanatory view showing a process of further laminating and bonding plate-shaped components 11D, 11E, 11F, and 11G in this order to the plate-shaped component 11C joined in the previous step. FIG. 3 is an explanatory diagram illustrating, in an enlarged manner, a situation in which a plate-shaped component 11C is coupled to a plate-shaped component 11B.

Hereinafter, a method for manufacturing a laminated product according to an embodiment of the present invention and a laminated product 10 manufactured using this manufacturing method will be described with reference to FIGS. 1 to 8. The method for manufacturing a laminated product in which a plurality of plate-shaped parts 11 are laminated and integrated can be adapted to various laminated products. Note that each of the figures described hereinafter is a schematic diagram showing simplified scale, aspect ratio, and shape.

(Configuration of laminated product 10)
FIG. 1 is a plan view showing one configuration example of a laminated product 10, and FIG. 2 is an enlarged cross-sectional view of the laminated product 10 taken along the line AA in FIG. Note that FIG. 1 shows the planar shapes of the plate-shaped component 11 and the laminated product 10. The laminated product 10 is constructed by laminating and bonding a plurality of plate-shaped parts 11. As shown in FIG. 1, the plate-shaped component 11 includes an annular base 12, a mounting portion 13 protruding outward from the annular base 12, and a large number of rectangular through holes 14 arranged annularly in the annular base 12. have. When the laminated product 10 is a laminated core used for a stator or rotor of a motor, a salient pole portion is formed between adjacent through holes 14, and a coil is wound around the salient pole portion.

A mounting hole 15 is provided in the mounting portion 13 . The laminated product 10 is fixed to a mounting plate (not shown) using screws or the like using the mounting holes 15. The plurality of plate-shaped parts 11 are stacked with the phases of the respective main parts matched, and are integrated at a plurality of joints 16. Although there are six joints 16 shown in FIG. 1, it is possible to further increase or decrease the number of joints 16. The area of the coupling part 16 is much smaller than the area of the annular base 12, and the example shown in FIG. 1 is an example in which the outer diameter of the annular base 12 is 200 mm and the outer diameter of the coupling part 16 is 2 mm. Next, the structure of the coupling portion 16 will be explained with reference to FIG. 2.

Note that FIG. 2 shows an example in which the plate-shaped component 11 is composed of seven pieces. The plate-shaped component 11 is a general term used to commonly describe each plate-shaped component laminated in multiple layers, and in this example, each plate-shaped component 11 is defined from the bottom layer to the top layer. The plate-shaped parts 11A, 11B, 11C, 11D, 11E, 11F, and 11G are arranged in this order. The outer shapes, through holes 14, and mounting portions 13 of the plate-shaped parts 11A to 11G have the same shape. A through hole 17 is provided at the position of the joint portion 16 in the lowermost plate-like component 11A. The plate-shaped component 11A and the plate-shaped component 11B are coupled by fitting the protrusion 18 of the plate-shaped component 11B into the through hole 17 of the plate-shaped component 11A. Further, the plate-shaped component 11B and the plate-shaped component 11C are coupled by fitting the convex portion 20 of the plate-shaped component 11C into the recess 19 of the plate-shaped component 11B.

The plate-shaped parts 11C and the plate-shaped parts 11D, the plate-shaped parts 11D and the plate-shaped parts 11E, the plate-shaped parts 11E and the plate-shaped parts 11F, and the plate-shaped parts 11F and the plate-shaped parts 11G are the same as the plate-shaped parts 11B and the plate-shaped parts. It is connected using the same connection structure as the component 11C. The plate-shaped parts 11A to 11G are joined together at the joint portion 16, so that the annular base 12 is brought into close contact with the plate-like parts 11A to 11G. Furthermore, in the mounting portion 13, the mounting holes 15 pass through the plate-like components 11A to 11G. Next, a method for manufacturing a laminated product will be described with reference to FIGS. 3 to 8.

(Manufacturing method for laminated products)
FIG. 3 is a cross-sectional view showing a plate-like component preparation process for the lowest-layer plate-like component 11A and the upper-layer plate-like component 11B. As shown in FIG. 1, the coupling portions 16 are provided at six locations on the annular base 12, but since the coupling portions 16 are coupled at the same time in the same manner at the six locations, in the following description, one location will be used as a representative. This will be explained as an example. FIG. 3(a) shows the plate-like component 11A in the lowest layer, and FIG. 3(b) shows the plate-like component 11B in the upper layer than the bottom-layer plate-like component 11A. In the plate-shaped component preparation step, as shown in FIG. 3(a), through-holes 17 are opened in the lowermost layer of the plate-shaped component 11A at the positions of the joint portions 16 by press working. In addition, in the plate-shaped component preparation step, as shown in FIG. 3(b), the plate-shaped component 11B has a convex portion 25 formed on one surface side and a convex portion 18 formed on the other surface side. Ru. Note that since the plate-shaped parts 11B to 11G have the same shape, the plate-shaped part 11B will be explained as a representative example.

FIG. 4 is a cross-sectional view showing a preparation process for the plate-shaped component 11B. FIG. 4(a) shows a process of extruding and forming a convex part 25 on the upper layer plate-like part 11B, and FIG. It shows the process of adding. In the step shown in FIG. 4A, the plate-shaped component 11B is formed by extruding the convex portion 25 with the punch 22 while the annular base portion 12 is sandwiched between the upper mold 26 and the lower mold 27. In the example shown in FIG. 4(a), the tip of the punch 22 has a truncated conical shape, and a chevron-shaped convex portion 25 whose bottom surface is a circle is formed. The shape of the tip of the punch 22 is not limited to a truncated cone, but may also be a pyramid with an n-sided planar shape (n is an integer), a truncated n-sided pyramid, a cone, or a shape with a rounded tip. It can be set as appropriate depending on the thickness t0 (see FIG. 8) and material of the shaped part 11B.

However, by making the tip of the punch 22 into a truncated cone shape, a flat area parallel to the annular base 12 is formed at the top 35 of the convex portion 25 . For this reason, when pressing the convex portion 25 with the punch 33 in the first bonding step (see FIG. 5), which will be described later, it is possible to It becomes possible to flatten the convex portion 25 evenly. In the example shown in FIG. 4A, the height of the convex portion 25 is set to be the same as the thickness of the annular base 12 (that is, the thickness of the plate-shaped component 11B). The height of the convex portion 25 can be appropriately set depending on the thickness t0 and material of the annular base 12.

In the step shown in FIG. 4B, the plate-like part 11B is half-blanked on the lower side while maintaining the shape of the convex part 25, and the convex part 18 is formed on the opposite side of the convex part 25. In this step, the periphery of the convex portion 25 of the plate-shaped component 11B is sandwiched between the upper mold 28 and the lower mold 29, and half punching is performed using the punch 30. The punch 30 has an escape recess 30 a of a size that escapes the convex portion 25 , and an outer circumferential end 30 b of the escape recess 30 a is configured as a plane parallel to the annular base 12 . That is, the outer peripheral end portion 30b does not contact the slope of the convex portion 25, and an annular flat portion 34 is formed around the root portion of the convex portion 25. The convex portion 25 after the half-blanking process moves downward while maintaining the chevron shape shown in FIG. 4(a). The plate-like parts 11C to 11G are formed in the same shape by the same method as the plate-like part 11B. That is, the plate-shaped parts 11B to 11G can be used in common. Note that it is possible to manufacture in advance a large number of the lowermost layer plate-like parts 11A and the upper layer plate-like parts 11B to 11G, and prepare them for the next first and second bonding steps. . Next, a first bonding step of bonding the upper layer plate component 11B to the lowermost layer plate component 11A will be described with reference to FIG.

FIG. 5 is an explanatory diagram showing the first bonding step. First, as shown in FIG. 5(a), after placing the plate-shaped part 11A on the lower die 31, the half-blanked plate-shaped part 11B is conveyed, and the plate-shaped part 11A is inserted into the through hole 17 of the plate-shaped part 11A. The convex portion 18 of the component 11B is fitted. This process is performed at the six joints 16 simultaneously. Therefore, the position of the plate-shaped component 11B relative to the plate-shaped component 11A is determined. Note that the position of the plate-shaped component 11A with respect to the lower mold 31 is determined by fitting the mounting hole 15 of the plate-shaped component 11A (see FIG. 1) with a guide pin (not shown) provided on the lower mold 31. ing. Next, the plate-shaped component 11B is coupled to the plate-shaped component 11A.

As shown in FIG. 5(b), the plate-like parts 11A and 11B are connected by fitting the protrusions 18 of the plate-like parts 11B into the through-holes 17 of the plate-like parts 11A. The periphery of the shaped part 25 is sandwiched between a lower die 31 and an upper die 32, and the punch 33 whose tip has a plane parallel to the annular base 12 is pressed until the convex part 25 becomes flat. Then, the convex portion 18 expands in the horizontal direction within the through hole 17 of the plate-shaped component 11A, and the plate-shaped component 11A and the plate-shaped component 11B are combined. At this time, a recess 19 into which the convex part 20 (see FIG. 2) of the plate-shaped component 11C can be fitted is formed in the upper layer side of the plate-shaped component 11B in the next step. After joining the plate-like parts 11A and 11B, the plate-like parts 11C are joined to the plate-like parts 11B.

FIG. 6 is an explanatory diagram showing a process of coupling the plate-shaped component 11C to the plate-shaped component 11B coupled to the plate-shaped component 11A. The plate-shaped component 11B is formed with a recess 19 into which the convex portion 20 of the plate-shaped component 11C formed in the first joining process of the plate-shaped component 11A and the plate-shaped component 11B can be fitted. After fitting the convex part 20 into the concave part 19 formed on the plate-like part 11B, the plate-like part 11C is formed by pressing the convex part 25 formed on the plate-like part 11C with the punch 33. It is coupled to the plate-shaped component 11B. The plate-shaped component 11C is formed with a recess 21 into which the convex portion 23 of the plate-shaped component 11D, which is an upper layer of the plate-shaped component 11C, can be fitted. The process of bonding the upper plate component 11C to the lower plate component 11B in this manner is referred to as a second bonding process.

FIG. 7 is an explanatory diagram showing a step of further laminating and bonding plate-shaped components 11D, 11E, 11F, and 11G in this order to the plate-shaped component 11C joined in the previous step. The connections between the plate-like parts 11C and 11D, the plate-like parts 11D and 11E, the plate-like parts 11E and 11F, and the plate-like parts 11F and 11G are made in the lower layer in each layer. This is possible by repeating the second joining step of fitting the convex portion of the plate-like component disposed in the upper layer into the concave portion of the plate-like component 11 to be disposed, and then pressing the convex portion 25. That is, in the second joining step, the convex portion 25 is fitted into the concave portion of the plate-like component 11 disposed relatively on the lower layer with the convex portion of the plate-like component 11 disposed relatively on the upper layer being fitted. The lower layer plate-like component 11 is bonded to the lower layer plate-like component 11 by pressing. Note that the plate-shaped parts 11A to 11G can be sequentially stacked and bonded using a common press device, but a press device may be provided for each bonding of each layer. In this example, an example was explained in which seven plate-shaped parts 11 are bonded together, but a large number of plate-shaped parts 11, such as 100 or 200 pieces, may be bonded, and the second bonding process is performed with a predetermined number of stacked plates. It becomes possible to manufacture the laminated product 10 by repeating the process until reaching . Next, regarding the detailed method of bonding the relatively upper plate component 11 and the relatively lower layer plate component 11 (second bonding step), an example of bonding the plate component 11C to the plate component 11B will be described. This will be explained in more detail with reference to FIG.

FIG. 8 is an enlarged explanatory diagram illustrating a situation in which the plate-shaped component 11C is joined to the plate-shaped component 11B. FIG. 8(a) shows a state in which the protrusion 20 of the plate-shaped component 11B is fitted into the recess 19 of the plate-shaped component 11B after the protrusion 20 of the plate-shaped component 11B is connected to the through hole 17 of the plate-shaped component 11A. represents the situation. FIG. 8(b) shows a situation in which the plate-shaped component 11C is coupled to the plate-shaped component 11B. When the diameter of the recess 19 of the lower layer plate-shaped component 11B is d1, and the diameter of the convex portion 20 of the upper layer plate-shaped component 11C is d2, the respective diameters d1 and d2 have a relationship of d1>d2. For example, when the thickness t0 of the annular base 12 is 0.25 mm and the thickness d1 is 2 mm, the gap g between the concave portion 19 and the convex portion 20 is set to 0.01 mm. In this way, the convex portion 20 of the plate-shaped component 11C can be easily fitted into the concave portion 19 of the plate-shaped component 11B without any load, thereby preventing deformation or warping during fitting. There isn't. The diameter of the through hole 17 of the plate-shaped component 11A is d1, which is the same as the diameter of the recess 19. Note that in FIG. 8(a), the gap g is exaggerated.

In the plate-shaped component 11C, if the depth of the concave portion 21 after being combined with the plate-shaped component 11B is f1, then the height of the convex portion 20 is also f1. The height f1 of the convex portion 20 is the same as the depth of the concave portion 19 of the plate-shaped component 11B. The remaining wall thickness t1 after half-blanking is preferably 40 to 50% of the thickness t0 of the annular base 12. Note that the remaining wall thickness t1 is appropriately set depending on the thickness t0 of the annular base 12 and the material of the plate-shaped component 11. Further, since the plate-shaped component 11C is half punched using the punch 30 at a position away from the slope of the convex part 25 in the outer circumferential direction, an annular flat part 34 is formed around the convex part 25.

As shown in FIG. 8(b), when the top part 35 of the convex part 25 of the plate-shaped part 11C is pressed with the punch 33 until it becomes flat by extending the annular plane part 34, the outer peripheral part 20a of the convex part 20 becomes convex. Using the intersection Q between the root of the portion 20 and the annular base 12 as a fulcrum, it attempts to expand outward as indicated by the symbol S (in the direction of the dotted arrow). In reality, since the inner circumferential wall portion 19a abuts the outer circumferential portion 20a, high bonding strength due to compressive stress is obtained. In addition, in the region of the remaining wall thickness t1, the force that tends to expand outward is parallel to the annular plane part 34 and evenly transmitted to the annular base 12 radially, so that the plate-like part 11C is warped. It becomes possible to suppress the Similarly, it is possible to suppress warpage in the plate-shaped parts 11D to 11G.

In the method for manufacturing a laminated product described above, first, in a plate-shaped component preparation process, a bottom layer plate-shaped component 11A in which a through hole 17 is opened in a joint portion 16, and a convex portion 25 on one surface side are formed. Then, plate-shaped components 11B to 11G in the upper layer than the bottom-layer plate-shaped component 11A are prepared, each having circular convex portions 18, 20, 23, . . . formed on the other surface side. In the first joining process, after fitting the convex part 18 of the upper layer plate-like part 11B into the through hole 17 of the lowermost layer plate-like part 11A, the convex part 25 is inserted using a punch 33 with a flat tip surface. It is pressed until it becomes flat to form a recess 19 into which the projection 20 of the upper plate component 11C to be joined in the next step can be fitted.

In the second joining step, after fitting the convex portion 20 of the upper layer plate-like component 11C into the recess 19 of the lower-layer plate-like component 11B, the convex portion 25 is pressed using a punch 33 until it becomes flat, A recess 21 is formed into which the projection 23 of the upper plate component 11D to be combined in the next step can be fitted.

According to such a manufacturing method, it is possible to increase the bonding strength of the plate-shaped component 11 between each layer and to suppress the occurrence of warping of the plate-shaped component 11 and the laminated product 10.

Further, in the method for manufacturing a laminated product, the second bonding step is repeated until a predetermined number of laminated products is reached. In such a second bonding step, when the convex part 25 of the plate-shaped component 11 in the upper layer is pressed, the flattened convex part 25 of each plate-shaped component disposed in the lower layer is further pressed. Become. By repeating the pressing process each time the upper layer of plate-like parts 11 is sequentially laminated, it is possible to increase the bonding strength of the plate-like parts 11 between each layer and to suppress the occurrence of warping of the laminated product 10. becomes.

In addition, in the plate-shaped component preparation process, after forming the convex part 25 on one side of the plate-shaped components 11B to 11C in the upper layer than the lowest layer plate-shaped component 11A by extruding, the periphery of the convex part 25 is Circular convex portions 18, 20, 23, . . . are formed to protrude from the other surface side by half punching. According to such a manufacturing method, while maintaining the shape of the convex portion 25, it is possible to connect the plate-shaped component 11 arranged relatively to the upper layer to the plate-shaped component 11 arranged relatively lower layer. It becomes possible to form the convex portion 25.

Further, in the plate-shaped component preparation step, an annular flat portion 34 is formed around the root portion of the convex portion 25. By pressing the convex portion 25 having a flat apex 35 from above with a punch 33 having a flat tip, the convex portion 25 is evenly pushed radially along the annular flat portion 34 within the through hole 17 or the recess. Because of this, it is possible to increase the bonding strength between the upper layer plate-shaped component 11 and the lower layer plate-shaped component 11, and to suppress the occurrence of warpage.

Further, in the plate-shaped component preparation step, the diameter d1 of the through hole 17 and the recesses 19, 21, . . . is formed larger than the diameter d2 of the convex portions 18, 20, 23, . By doing so, it is possible to easily fit the convex part of the relatively arranged upper layer plate part 11 into the recessed part of the lower layer plate part 11 without any load. Therefore, there is no risk that the plate-shaped component 11 will be deformed or warped during fitting.

Further, when the laminated product 10 is a laminated core and the plate-shaped component 11 constituting the laminated core is a core plate formed of an electromagnetic steel plate, according to the above method for manufacturing a laminated product, the core plates are bonded between each layer. It is possible to increase the strength and suppress the occurrence of warping of the core plate and laminated core.By using the laminated core in the stator and rotor of the motor, noise and vibration can be suppressed and the efficiency of the magnetic circuit can be improved. This makes it possible to achieve

In addition, the laminated product 10 has a lowermost plate-like component 11A having a through hole 17 provided in a joint portion 16, a convex portion 25 on one side, and a half-opening around the convex portion 25. It is composed of plate-shaped parts 11B to 11G in the upper layer than the lowermost plate-shaped part 11A, which have circular convex parts 18, 20, 23, . . . formed on the other side by processing. The upper plate component 11 is formed by pressing the convex portion 25 with the convex portion 18 fitted in the through hole 17, and the convex portion 20 of the upper layer plate component 11C can be fitted thereto. A plate-like component 11 having a recessed portion 19 and disposed in a relatively lower layer and a plate-like component 11 disposed in a relatively upper layer are They are joined together by pressing the convex portion 25 while the convex portion of the plate-shaped component 11 disposed on the upper layer is fitted.

The laminated product 10 configured in this manner can increase the bonding strength between the plate-shaped components 11 and suppress the occurrence of warpage.

10... Laminated product (laminated core), 11, 11A to 11G... Plate-shaped component (core plate), 12... Annular base, 13... Mounting part, 14, 17... Through hole, 15... Mounting hole, 16... Joint part, 18, 20, 23... Convex portion, 19, 21... Concave portion, 22, 30, 33... Punch, 25... Convex portion, 26, 28, 32... Upper die, 27, 29, 31... Lower die, 34... Annular Flat part, 35...Top, d1, d2...Diameter, f1...Depth of recess (height of convex part), g...Gap, t0...Thickness, t1...Remaining wall thickness, Q...Intersection.

Claims (5)

A method for manufacturing a laminated product in which a plurality of plate-like parts are laminated and integrated at a plurality of joints, the method comprising:
The plate-like component in the lowermost layer has a through hole opened in the joint portion, and the plate-like component in the lowermost layer has a convex portion formed on one side and a convex portion on the other side. a plate-shaped component preparation step of preparing the plate-shaped component in a layer above the component;
After fitting the convex portion of the plate-like component of the upper layer into the through hole of the plate-like component of the lowermost layer, pressing the convex portion using a punch with a flat end surface until the convex portion becomes flat. a first bonding step of forming a recess into which the convex portion of the plate-shaped component of the upper layer to be bonded in the next step can be fitted;
After fitting the convex part of the plate-shaped component of the upper layer into the concave part, the punch is used to press the convex part until it becomes flat. a second joining step of forming the recess into which the protrusion of the plate-shaped component can be fitted;
A method for manufacturing a laminated product, comprising: In the method for manufacturing a laminated product according to claim 1,
a step of repeating the second bonding step until a predetermined number of laminated sheets is reached;
A method for manufacturing a laminated product characterized by: In the method for manufacturing a laminated product according to claim 1,
In the plate-shaped component preparation step, after forming the convex portion on one side of the plate-shaped component in the upper layer by extruding the plate-shaped component in the upper layer than the plate-shaped component in the lowermost layer, the periphery of the convex portion is formed in half. Formed by a step of protruding the protrusion on the other surface side by punching,
A method for manufacturing a laminated product characterized by: In the method for manufacturing a laminated product according to claim 3,
A method for producing a laminated product, characterized in that, in the plate-shaped component preparation step, an annular flat portion is formed around a root portion of the convex portion. In the method for manufacturing a laminated product according to any one of claims 1 to 4 ,
The laminated product is a laminated core, and the plate-shaped component constituting the laminated core is a core plate formed of an electromagnetic steel plate.
A method for manufacturing a laminated product characterized by:

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