JP2001105045A - Laminated and bonded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated and bonded part having large bonding force between adjacent sheet pieces with each other as compared to a conventional laminated and bonded part and having stable quality. SOLUTION: In a laminated and bonded part in which a large number of metallic sheet pieces having a protrusion part are laminated and adjacent sheet pieces 23 are bonded, the protrusion part 24 formed on the sheet piece 23 is constituted so that a recessed part 24a is arranged on one face and a projecting part 24b on the other face and tapered parts 24c are arranged at the tip of the projecting part 24b and the inlet of the recessed part 24a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated and fixed product used for, for example, a motor core or a stator core.

[0002]

2. Description of the Related Art In recent years, laminated products such as motor cores and stator cores have been required to laminate thin plates with high precision. It is not an exaggeration to say that the lamination accuracy of the laminated and fixed product is determined by the degree of concentricity of the center of the projections and depressions of the projection formed on the metal thin plate.

Hereinafter, an example of a conventional apparatus for manufacturing a laminated and bonded product will be described with reference to the drawings. FIG. 13 is a cross-sectional view of a stamping projection forming tool portion of a manufacturing die for forming a stamping projection on a thin metal plate which is a component of a conventional laminated and bonded product. In FIG. 13, reference numeral 1 denotes an embossing projection forming punch attached to the punch plate 2 so as to protrude downward. On the lower side of the punch plate 2, there is provided a die plate 4 having an embossed projection forming die button 3 embedded therein so as to face the embossed projection forming punch 1.
Is provided with an ejector 5 which pushes out a formed projection from the projection forming die button 3. The ejector 5 has a lower end located inside a lower die set 6 provided to be overlapped below the die plate 4, and is urged upward by a spring 7 from below.

[0004] FIG.
FIG. The lower end of the projection forming punch 1 is provided with a forming shaft 1a having a forming slope at the tip. FIG. 15 is an enlarged view of the stamping die forming die button 3.
It has a hole 3a conforming to the shape of a. FIG.
The figure shows a state in which the projection 9 is formed on a thin plate 8 made of a metal material which is a component of a laminated and fixed product such as a motor core or a stator core, by the punch 1 and the die button 3. Yes,
The embossing protrusion forming punch 1 is lowered, and the lower end of the shaping shaft portion 1a presses the thin plate 8 against the hole 3a of the protrusion forming die button 3, whereby the embossing protrusion 9 is formed on the thin plate 8.

[0005] FIG. 17 shows that a thin plate 8 on which a projection 9 is formed is punched into a required shape, and the projection 9 of the upper thin plate piece 10 is changed to a lower thin plate piece 10.
This shows a state in which the thin plate pieces 10 are fitted into the concave portions 11 on the upper surface at the positions of the punching projections 9, and the thin plate pieces 10 are stacked and fixed in the vertical direction. The outer shape is punched. The concave portion 11 on the upper surface and the convex portion on the lower surface of the embossing projection 9 are formed in the same shape. Reference numeral 14 is provided inside the outer shape punch 13, and the lower end is fitted into the concave portion 11 on the upper surface at the position of the projection 9, and when the thin plate pieces 10 are vertically stacked and fixed inside the outer shape punching die 12, the punching is performed. This is a guide for preventing the projection 9 from being pushed upward.

[0006]

However, the accuracy of a single part in machining a part is ± 0.00% in the current machine precision.
Although it is possible in the range of 3 mm, there is a limit to the overall accuracy in processing with a mold having a configuration as shown in FIG.
A center shift as shown by A in FIG. 13 occurs between the projection forming punch 1 and the projection forming die button 3. When the embossing projection 9 is formed on the thin plate 8 in such a state, as shown in FIG. 16, a center shift indicated by A also occurs between the concave portion 11 on the upper surface and the convex portion on the lower surface of the embossing projection 9. . When the punching projection 9 having the center deviation thus generated is punched out, the state as shown in FIG. 17 is obtained, and the upper surface of the punching projection 9 of the thin plate piece 10 previously punched into the punching die 12 is obtained. Since the center is shifted between the concave portion 11 and the projection 9 to be punched out next, the thin plate pieces 10 and 10 are not completely engaged with each other. It is considered that the reason is that the concave portion 11 on the upper surface and the convex portion on the lower surface of the embossing projection 9 are formed in the same shape as described above. Since the joining is not completely performed, the accuracy of the laminated press product is deteriorated. In order to adjust this, the protrusion projection forming die button 3
Although it is necessary to correct the position of the die plate 4 and the like, this requires a lot of time.

The present invention has been made to solve the above-mentioned problem, and it is possible to easily produce a laminated and fixed product having a stable bonding quality with respect to adjacent thin plates as compared with a laminated and fixed product produced by the above-mentioned prior art. It is intended to be able to be manufactured at a high speed.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a laminated and bonded product formed by laminating a large number of thin plate pieces made of a metal material and having projections, and connecting and fixing adjacent thin plate pieces. The laminated and fixed product, wherein the projection formed on the thin plate piece has a concave portion on one surface, a convex portion on the other surface, and a tapered portion provided at the tip of the convex portion or at the entrance of the concave portion. is there.

According to the present invention, when the adjacent thin plate pieces are joined by fitting the convex portion of the other thin plate piece into the concave portion of one thin plate piece, the convex portion or the concave portion of the thin plate piece is combined. At least one of them is provided with a tapered portion for guiding the fitting, and when forming the projection, a center shift occurs between the concave portion on the upper surface and the convex portion on the lower surface of the projection, and the lower portion is formed at the time of laminating the thin plate pieces. Even if a displacement occurs between the concave portion of the thin sheet piece on the side and the convex portion of the upper thin sheet piece, the convex portion is guided by the tapered portion formed in the convex portion or the concave portion and fits in the concave portion,
The lamination and joining of the thin plate pieces can be reliably performed.

Further, according to the present invention, since the mold for forming the projection does not require a high-precision machining capability,
The mold can be provided at low cost.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention is a laminated and fixed product obtained by laminating a large number of thin plate pieces made of a metal material and having protrusions and joining and fixing adjacent thin plate pieces. The protrusions formed on the thin plate pieces are provided with a concave portion on one surface, a convex portion on the other surface, and a tapered portion provided at the tip of the convex portion or at the entrance of the concave portion. When joining adjacent thin plate pieces by fitting the convex portion of the other thin plate piece into the concave portion of one thin plate piece, guide the fitting into at least one of the convex portion or the concave portion of the thin plate piece. The center deviation occurs between the concave portion on the upper surface of the projection and the convex portion on the lower surface during the formation of the projection, and when laminating the thin plate pieces, the concave portion of the lower thin plate piece and the upper portion are formed. Even if the misalignment occurs between the protruding parts of the thin plate pieces, the protruding parts will be formed into convex parts or concave parts. Since it is guided by the set taper portion and fits into the concave portion, the lamination and joining of the thin plate pieces can be reliably performed, and furthermore, the mold for forming the embossing projection does not require a high-precision machining ability. And an effect that the mold can be provided at low cost. (Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a partially cutaway perspective view of a motor core as a laminated and bonded product 21. Fitting portions 22 provided at three positions in a circumferential direction are thin plate pieces made of a metal material, specifically, a magnetic material. 23, has the function of bonding and fixing the two. FIG. 2 is an enlarged sectional view of an essential part of one thin plate piece 23. As described above, in order to connect and fix adjacent thin plate pieces 23, 23 to each other, three places in the circumferential direction of each thin plate piece 23 are provided. The projection 24 is formed on the projection. The shape of the concave portion 24a on the upper surface of the embossed protrusion 24 is circular (see FIG. 3) when viewed from the upper surface, but a tapered portion 24c is formed at the entrance as viewed from the side surface as shown in FIG.

FIG. 4 shows the thin plate pieces 23, 23 adjacent to each other.
5 shows an enlarged cross-sectional view of the connecting portion of FIG. 5, in which a concave portion 24a of one thin plate piece 23 is fitted with a convex portion 24b of the other thin plate piece, and at this time, a tapered portion 24c is formed at the entrance of the concave portion 24a. Have been. In the embodiment of the present invention, the tapered portion 24
c is a plate thickness of 0.5, the length is 0.12 to 0.15,
The diameter is set between 0.02 and 0.03.

FIG. 6 is a view showing a state in which a projection is formed on a thin plate constituting a laminated and fixed product, a plurality of thin plate pieces are vertically stacked, and the thin plate pieces which are adjacent to each other in a vertical direction are fitted and fixed to each other. 1 shows an apparatus for manufacturing an article. In the drawing, reference numeral 25 denotes an upper die, and 26 denotes a lower die. A punching projection is formed on a thin plate 27 at a punching projection forming position C between the two dies 25 and 26, and a punching projection 24 is formed at an external punching and laminating position D. The obtained thin plate 27 is punched into a required shape, and the thin plate pieces 23 adjacent to each other in the vertical direction are fitted and fixed by pressing to produce a laminated fixed product. The upper die 25 includes an upper die set 29, a punch plate 30 attached below the upper die set 29, and a stripper plate provided below the punch plate 30 via a spring (not shown). 31. The lower die 26 includes a lower die set 32 and a die plate 33 provided above the lower die set 32. Then, at the above-mentioned stamping protrusion forming position C, the upper die 25 is provided with the punch plate 30 and the stripper plate 3.
1, a projection-forming punch 34 is provided downward, and the lower die 26 has a projection-forming punch 3
A projection forming die button 35 embedded in a die plate 33 is provided facing upwardly. Further, the formed protrusion is formed in the inside of the protrusion forming die button 35.
An ejector 36 that pushes up from 5 is provided.
The lower end of the ejector 36 is located inside a lower die set 32 provided to overlap the lower side of the die plate 33, and is urged upward by a spring 37 from below.
At the ejection projection forming position C having such a configuration, the lowering of the upper die 25 causes the ejection projection forming punch 34 and the ejection projection forming die button 35 to perform:
In the fitting portion 22 of the laminated fixed product 21 shown in FIG. 1, the projections 24 are formed at three places in the circumferential direction as shown in FIG. Further, at the outer shape punching / stacking position D, the upper die 25 is provided with a product punch 38 downwardly over the punch plate 30 and the stripper plate 31, and the lower die 26 is opposed to the product punch 38. A product punching die button 39 and a back pressure block 40 embedded in the die plate 33 and the lower die set 32 are provided. Therefore, when the thin plate 27 having the projections formed at three locations at the projection formation position C moves to the outer shape punching and laminating position D, the upper die 25 descends, and the product punch 3
8 and the product punching die button 39 is used to punch the outer shape, and is sequentially pushed into the product punching die button 39 as the thin plate piece 23. The inner diameter of the product punching die button 39 is slightly larger than the inner diameter of the back pressure block 40. Of the thin sheet pieces 23 that have been punched out by the product punching punch 38 and the product punching die button 39 by the lowering of the upper die 25, The thin sheet piece 23 that has been punched out first
After the pressure is lowered to the position of the back pressure block 40, the inner diameter of the back pressure block 40 is slightly smaller than the outer diameter of the thin plate piece 23. It will be received once at the upper end of the block 40. Then, when the thin sheet piece 23 is pushed into the product punching die button 39, the product punching punch 38
Is lowered, and the convex portion 24b of the upper thin plate piece 23 is press-fitted into the concave portion 24a of the lower thin plate piece 23 adjacent to each other.
Are sequentially laminated and pressed into the back pressure block 40, and when a predetermined number of thin plate pieces 23 are laminated, they are taken out from the lower end of the back pressure block 40 as a laminated fixed product 21.
In addition, the thin sheet piece 23 that is first punched out is
It is sufficient that the upper thin plate piece 23 has only a concave portion on the upper surface into which the convex portion 24b is pressed. This is performed by means different from the molding die button 35.

FIGS. 7 and 8 are enlarged side views of the protrusion forming punch and the protrusion forming die button. As shown in FIG. It has a tapered portion 41 and a straight portion 42, and the projection forming die button 35 has a straight side wall, and the diameter thereof is set slightly larger than the diameter of the straight portion of the projection forming punch 34,
It is located in the mold.

As shown in FIG. 2, a recess 24a having a tapered shape 24c is formed at the entrance of the upper surface of the thin plate 27 by using the punch 34 and the die button 35 having the above-described configuration. At the punching lamination position D, the outer shape is punched by the product punch 38 and the product die button 39, and the lower piece 23 is lowered by the lowering of the product punch 38.
When the convex portion 24b of the upper thin plate piece 23 is fitted into the concave portion 24a, even if a deviation occurs between the convex portion 24b and the concave portion 24a, the convex portion 24b is guided by the tapered portion 24c and Since it fits in the inside 24a, the lamination connection of the upper and lower thin plate pieces 23, 23 can be reliably performed. (Embodiment 2) FIGS. 9 to 12 are views showing a second embodiment of the present invention.

In the above-described embodiment, the guide portion formed of the tapered portion is provided on the concave side of the embossing projection. However, in this embodiment, the guide portion is provided on the convex side of the embossing projection.
The process of forming the projection is the same as that of the above embodiment, and the description is omitted. In FIG. 11, the punch-out forming punch 46 is shown in FIG.
Numerals 3 are respectively shown in FIG. 12 and are arranged facing each other in the mold. Die button 43
Has a tapered portion 44 and a straight portion 45, and the straight portion 45 is set slightly smaller than the punch-out forming punch 46.

By using the projection-forming punch 46 and the projection-forming die button 43 having such a configuration, a projection having a straight concave portion 47 and a convex portion having a tapered portion 48 and a straight portion 49 shown in FIG. Is molded. When the convex portion of the thin plate piece is fitted into the concave portion, even if a deviation occurs between the two, the tapered portion 48 provided on the convex portion serves as a guide portion and fits into the concave portion 47,
The lamination and joining of the upper and lower thin plate pieces can be reliably performed.

[0019]

As described above, according to the present invention, when the adjacent thin plate pieces are joined by fitting the convex portion of the other thin plate piece into the concave portion of one thin plate piece, At least one of the one-sided projection or the thin plate-shaped single-sided recess is provided with a tapered portion for guiding the fitting, and when the projection is formed, a center shift occurs between the recess on the upper surface of the projection and the projection on the lower surface, At the time of laminating the thin plate pieces, even if a displacement occurs between the concave portion of the lower thin plate piece and the convex portion of the upper thin plate piece, the convex portion is guided by the tapered portion formed into the convex portion or the concave portion. Since the thin plate pieces are fitted into the concave portions, the lamination connection of the thin plate pieces can be reliably performed.

Further, according to the present invention, since the mold for forming the projection does not require a high-precision machining capability,
The mold can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a motor core as a laminated fixed product according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of a projection of the thin plate piece.

FIG. 3 is an enlarged plan view of a concave portion of a projection of the thin plate piece.

FIG. 4 is an enlarged sectional view of a main part showing a state where two pieces of the same thin plate piece 2 are stacked.

FIG. 5 is an enlarged view of a tip of a projection punching and forming punch.

FIG. 6 is a cross-sectional view of the manufacturing apparatus for the laminated press product.

FIG. 7 is an enlarged side view of the embossed projection forming punch.

FIG. 8 is an enlarged side view of the stamping die button.

FIG. 9 is an enlarged sectional view of a main part of a projection of a thin plate piece according to a second embodiment of the present invention.

FIG. 10 is an enlarged sectional view of a main part showing a state in which two pieces of the thin plate are stacked.

FIG. 11 is an enlarged side view of the embossing projection forming punch.

FIG. 12 is an enlarged side view of the embossed protrusion forming die button.

FIG. 13 is a cross-sectional view of a stamping projection forming tool portion of a conventional manufacturing die for forming a stamping projection.

FIG. 14 is an enlarged perspective view of the embossing projection forming punch.

FIG. 15 is an enlarged perspective view of the embossed protrusion forming die button.

FIG. 16 is an enlarged cross-sectional view of a main part showing a molding state of the projection.

FIG. 17 is an enlarged sectional view of a main part showing a state in which thin plate pieces are stacked and fixed in the vertical direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Lamination press product 22 Fitting part 23 Thin plate piece 24 Embossing projection 24a Concave part 24b Convex part 24c Taper part 25 Upper die 26 Lower die 27 Thin plate 29 Upper die set 30 Punch plate 31 Stripper plate 32 Lower die set 33 Die plate 34 Projection forming punch 34a Forming shaft portion 35 Die projection forming die button 35a Arc-shaped concave portion 35b Hole 36 Ejector 37 Spring 38 Product punching punch 39 Product punching die button 40 Back pressure block 41 Molding punch taper portion 42 Molding punch straight portion 43 Forming projection molding Die button 44 Taper part 45 Straight part 46 Punching projection forming punch 47 Concave part 48 Tapered part 49 Convex part

Claims (1)

[Claims] 1. A laminated and fixed product obtained by laminating a plurality of thin plate pieces made of a metal material and having protrusions, and bonding and fixing adjacent thin plate pieces, wherein the protrusions formed into the thin plate pieces are A laminated fixed product comprising a concave portion on one surface and a convex portion on the other surface, and a tapered portion provided at the tip of the convex portion or at the entrance of the concave portion.