CN116260261B

CN116260261B - Self-buckling iron core structure and preparation method thereof

Info

Publication number: CN116260261B
Application number: CN202310531055.4A
Authority: CN
Inventors: 张建旺; 张细姣; 罗雪归; 夏悠; 黄亮; 李炽文
Original assignee: Foshan Chuanheng Electromechanical Manufacturing Co ltd
Current assignee: Foshan Chuanheng Electromechanical Manufacturing Co ltd
Priority date: 2023-05-12
Filing date: 2023-05-12
Publication date: 2023-07-07
Anticipated expiration: 2043-05-12
Also published as: CN116260261A

Abstract

The invention discloses a self-buckling iron core structure and a preparation method thereof, and relates to the technical field of iron core preparation. The self-buckling iron core structure comprises a plurality of iron core singlechips which are stacked, and a gap exists between any two adjacent iron core singlechips. The self-buckling iron core structure provided by the invention can be heated uniformly inside and outside in tempering treatment, and can be subjected to paint dipping to form a secondary coating, so that the quality is obviously improved.

Description

Self-buckling iron core structure and preparation method thereof

Technical Field

The invention relates to the technical field of iron core preparation, in particular to a self-buckling iron core structure and a preparation method thereof.

Background

The iron core is generally divided into a stator iron core and a rotor iron core, and is widely applied to various motors. In the process of preparing the iron core in the market at present, after the single stamping is carried out on the iron core single sheet to form the overlapping riveting points of the front groove and the back boss, the iron core single sheet is stacked according to the matching mode of the overlapping riveting points.

The concave depth of the groove of the overlapped riveting point after single stamping is equal to the convex height of the boss, and in a plurality of iron cores overlapped by the overlapped riveting point, two adjacent iron cores are in single-piece lamination without gaps, so that the iron core structure is heated unevenly in subsequent tempering treatment, and the outer surface is over-burned and the inner temperature is insufficient. And the paint dipping cannot be performed to form a secondary coating, so that the peeled coating cannot be filled in the stamping and stacking process.

Disclosure of Invention

The invention aims to provide a self-buckling iron core structure which can be heated uniformly inside and outside in tempering treatment and can be subjected to paint dipping to form a secondary coating, so that the quality is remarkably improved.

The invention further aims to provide a preparation method of the self-buckling iron core structure, and the prepared self-buckling iron core structure can be heated uniformly inside and outside in tempering treatment and can be subjected to paint dipping to form a secondary coating.

The embodiment of the invention provides a technical scheme that:

a preparation method of a self-buckling iron core structure comprises the following steps:

stamping a plurality of iron core single pieces at a first riveting point stamping station, so that a plurality of iron core single pieces respectively form a stacking riveting point groove and a stacking riveting point protrusion on two opposite sides;

stamping inner bottom walls of a plurality of overlapping riveting point grooves at a second riveting point stamping station, so that the height of each overlapping riveting point bulge is increased to exceed the concave depth of each overlapping riveting point groove;

and stacking and arranging a plurality of iron core singlechips in sequence, and enabling the stacking riveting point of the later iron core singlechips to be embedded into the stacking riveting point groove of the former iron core singlechips, so as to obtain a self-buckling iron core structure with gaps between the adjacent iron core singlechips.

Further, the step of stamping the inner bottom walls of the plurality of the stacking point grooves at the second riveting point stamping station so that the height of the stacking point protrusions is increased to exceed the recess depth of the stacking point grooves comprises the following steps:

and stamping and forming a stamping dent on the inner bottom wall of the overlapped riveting point groove at the second riveting point stamping station so that the top wall of the overlapped riveting point bulge is raised to form a convex arc top wall.

Further, the step of stacking and arranging a plurality of the core individual pieces in order, and embedding the overlap riveting point protrusions of the following core individual pieces into the overlap riveting point grooves of the preceding core individual pieces includes:

a plurality of the core individual pieces are stacked and arranged in sequence, and the convex arc top wall portions of the core individual pieces at the back are embedded into the punching dents of the core individual pieces at the front.

Further, after the step of sequentially stacking and arranging a plurality of core singlechips, and enabling the stacking riveting point protrusions of the following core singlechips to be embedded into the stacking riveting point grooves of the preceding core singlechips, obtaining a self-fastening core structure with gaps between adjacent core singlechips, the preparation method further comprises:

tempering the self-buckling iron core structure, and/or carrying out vacuum paint dipping on the self-buckling iron core so as to form secondary coatings on the surfaces of a plurality of iron core single sheets.

Further, after the step of tempering the self-fastening iron core structure and/or vacuum impregnating the self-fastening iron core to form a secondary coating on the surfaces of the plurality of iron core singlechips, the manufacturing method further includes:

and compacting the self-buckling iron core structure along the stacking direction of a plurality of iron core single sheets so as to eliminate gaps existing between adjacent iron core single sheets.

The embodiment of the invention also provides a self-buckling iron core structure, which is prepared by the preparation method of the self-buckling iron core structure, and comprises a plurality of iron core single sheets which are stacked, wherein a gap exists between any two adjacent iron core single sheets.

Further, the opposite sides of each of the iron core single sheets are respectively provided with a stacking riveting point groove and a stacking riveting point protrusion, and the concave depth of the stacking riveting point groove is smaller than the protrusion height of the stacking riveting point protrusion;

the stacking point protrusions of any two adjacent iron core singlechips are embedded into the stacking point grooves of the rest one and are abutted against the inner bottom wall of the stacking point grooves.

Further, the stacking rivet point protrusion is provided with a convex arc top wall, and the convex arc top wall of one of any two adjacent iron core singlechips abuts against the inner bottom wall of the stacking rivet point groove of the remaining one.

Further, the stacking riveting point protrusion is further provided with a first side wall and a second side wall which are arranged at an included angle, two opposite sides of the convex arc top wall are respectively connected with the first side wall and the second side wall, and two inner side walls of one stacking riveting point groove of any two adjacent iron core singlechips and the first side wall and the second side wall of the remaining iron core singlechips form gaps respectively.

Further, a stamped indentation is formed in the middle of the inner bottom wall of the staking point recess, and the convex arc top wall portion of one of any two adjacent iron core singlechips is embedded into the stamped indentation of the remaining one.

Compared with the prior art, the self-buckling iron core structure provided by the invention has the advantages that under the state of stacking arrangement, a gap exists between any two adjacent iron core singlechips. Therefore, heat can be guaranteed to enter the structure when tempering treatment is carried out subsequently, paint dipping treatment can be carried out to form a secondary coating on the surface of the iron core single sheet, so that the coating peeled off in the stamping and stacking processes is filled, the resistance between sheets is increased, and the iron loss is reduced. Therefore, the self-buckling iron core structure provided by the invention has the beneficial effects that: can be heated uniformly inside and outside in tempering treatment, and can be subjected to paint dipping to form a secondary coating, thereby remarkably improving the quality.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. Other relevant drawings may be made by those of ordinary skill in the art without undue burden from these drawings.

Fig. 1 is a cross-sectional view of a self-fastening core structure provided in an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the core monolith of FIG. 1;

fig. 3 is a flow chart of a method for manufacturing a self-fastening iron core structure according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of the core single sheet after the processing of step S101 in fig. 3.

Icon: 100-self-buckling iron core structure; 110-core monoliths; 111-overlapping riveting point grooves; 1111-stamping the dent; 112-stacking rivet point protrusions; 1121—a convex arc top wall; 1122-a first side wall; 1123-a second sidewall.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships conventionally put in place when the inventive product is used, or the directions or positional relationships conventionally understood by those skilled in the art are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, terms such as "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The following describes specific embodiments of the present invention in detail with reference to the drawings.

Examples

Referring to fig. 1, fig. 1 is a cross-sectional view of a self-fastening core structure 100 according to the present embodiment.

The self-fastening iron core structure 100 provided in this embodiment includes a plurality of iron core singlechips 110 stacked in sequence, and a gap exists between any two adjacent iron core singlechips 110.

It will be appreciated that existing cores are also formed from a plurality of stamped individual pieces stacked together, and that adjacent individual pieces of the existing core will fit without gaps after stacking is completed. The self-fastening iron core structure 100 provided in this embodiment has a gap between two adjacent iron core single sheets 110, so that heat can be ensured to enter the structure from the gap when tempering is performed subsequently. A paint dipping process may also be performed to form a secondary coating on the surface of the core piece 110 to fill in the coating that peels off during the stamping and stacking process.

Referring to fig. 2 in combination, a cross-sectional view of the core segment 110 of fig. 2 is shown.

The respective opposite sides of the plurality of core pieces 110 are respectively provided with a stacking rivet point groove 111 and a stacking rivet point protrusion 112, and the recess depth of the stacking rivet point groove 111 is smaller than the protrusion height of the stacking rivet point protrusion 112. The clinch point protrusion 112 of one of any adjacent two core pieces 110 is embedded in the clinch point groove 111 of the remaining one and abuts against the inner bottom wall of the clinch point groove 111.

The self-fastening iron core structure 100 provided in this embodiment is formed by stacking a plurality of iron core single pieces 110 in sequence, and in the stacking process, the stacking point protrusion 112 of the following iron core single piece 110 is embedded into the stacking point groove 111 of the preceding iron core single piece 110 and abuts against the inner bottom wall of the stacking point groove 111. Since the height of the protrusion 112 of the staking point is greater than the depth of the recess 111 of the staking point, when any two core pieces 110 are stacked, the two core pieces 110 cannot be bonded, and a gap is formed therebetween.

In this embodiment, the stacking rivet protrusion has a convex arc top wall 1121, a first side wall 1122 and a second side wall 1123, the first side wall 1122 and the second side wall 1123 are disposed opposite to each other, and the first side wall 1122 and the second side wall 1123 are disposed at an included angle. Opposite sides of the convex arc top wall 1121 are respectively connected to the first side wall 1122 and the second side wall 1123. And, each of the first side wall 1122 and the second side wall 1123 is connected to the main body portion of the core segment 110 at a side away from the convex arc top wall 1121.

For any adjacent two core segments 110, the convex arc top wall 1121 on the following core segment 110 abuts against the inner bottom wall of the staking point recess 111 of the preceding core segment 110 in the stacking order. And, one inner sidewall of the staking point recess 111 of the preceding core segment 110 corresponds to the first sidewall 1122 on the following core segment 110 with a gap therebetween; the other inner side wall of the staking point recess 111 of the preceding core segment 110 corresponds to the second side wall 1123 of the following core segment 110 with a gap therebetween as well.

Therefore, in the self-fastening core structure 100 provided in this embodiment, of any two adjacent core segments 110, the remaining portions of the following core segment 110, except for a portion on the convex arc top wall 1121, are not in contact with the preceding core segment 110 on the side of the preceding core segment 110.

Also, in the present embodiment, the middle position of the inner bottom wall of the staking point recess 111 has a punched dimple 1111, and the convex arc top wall 1121 of one of any adjacent two core pieces 110 is partially embedded in the remaining one punched dimple 1111.

It will be appreciated that the stamped dimple 1111 is formed when the inner bottom wall of the clinch point groove 111 is stamped, and that the stamped dimple 1111 has a smaller width dimension than the end width dimension of the clinch point protrusion 112, i.e., the width dimension of the cam top wall 1121, due to the pressing action of the two sides of the stamped dimple in the middle.

Therefore, when stacking, the protruding arc top wall 1121 of the following core single piece 110 cannot be completely embedded into the punching dent 1111, and the punching dent 1111 can play a certain role in positioning the stacking arrangement due to the gaps between the first side wall 1122 and the second side wall 1123 of the following core single piece 110 and the two side walls of the riveting point groove 111 of the preceding core single piece 110.

In the self-fastening iron core structure 100 provided in this embodiment, when tempering is performed subsequently, heat can reach the inside of the structure through the gaps between the adjacent iron core single sheets 110, so that the internal and external temperatures of the self-fastening iron core structure 100 are uniform. In addition, the self-fastening iron core structure 100 can also be subjected to paint dipping treatment so as to form secondary coatings on two sides of the iron core single sheet 110, thereby filling in the peeling of the coatings caused in the punching and stacking processes, increasing the inter-sheet resistance, reducing the iron loss and improving the quality.

The embodiment also provides a method for manufacturing the self-fastening iron core structure 100. Referring to fig. 3, fig. 3 is a flow chart of the preparation method. Specifically, the preparation method comprises the following steps:

step S101, stamping the plurality of core individual pieces 110 at the first riveting point stamping station, so that the plurality of core individual pieces 110 respectively form the stacking riveting point groove 111 and the stacking riveting point protrusion 112 on respective opposite sides.

Referring now to fig. 4 in combination, fig. 4 is a cross-sectional view of a core segment 110 punched through a first rivet point punching station. It can be seen that the stacking riveting point groove 111 and the stacking riveting point protrusion 112 formed after being punched by the first riveting point punching station are isosceles trapezoids, the top of the stacking riveting point protrusion 112 is in a planar structure, and at this time, the recess depth of the stacking riveting point groove 111 is equal to the protrusion depth of the stacking riveting point protrusion 112.

With continued reference to fig. 3, the preparation method may further include:

step S102, stamping the inner bottom walls of the plurality of overlapped-rivet-point grooves 111 at a second riveted-point stamping station, so that the height of the overlapped-rivet-point protrusions 112 is increased to exceed the concave depth of the overlapped-rivet-point grooves 111.

Referring to fig. 2 in combination, fig. 2 is a cross-sectional view of the core segment 110 after being punched at the second riveting point punching station. It should be noted that, the dies of the first riveting point stamping station and the second riveting point stamping station may be selected differently according to practical application conditions, which is not limited in this embodiment. A second rivet stamping station is used to stamp the stamped indentation 1111 into the inner bottom wall of the rivet recess 111 such that the top wall of the rivet protrusion 112 bulges to form a convex arc top wall 1121.

It will be appreciated that, since the inner bottom wall of the clinch point groove 111 is smaller in size in the width direction and is limited in the width direction by the die of the second clinch point punching station, when the inner bottom wall of the clinch point groove 111 is punched at the second clinch point punching station, the portions on both sides of the punching position on the inner bottom wall are pressed and piled up toward the punching position, and the convex arc top wall 1121 is formed to bulge on the planar top wall of the clinch point protrusion 112. So that the protrusion height of the clinch point protrusion 112 is increased so that the protrusion height of the clinch point protrusion 112 exceeds the recess depth of the clinch point groove 111 without increasing the recess depth of the clinch point groove 111 even in the case where the recess depth is decreased due to the pressing and stacking of the portions on both sides in the width direction to the punching position.

And, since the inner bottom wall of the overlapped-rivet-point groove 111 is limited in the width direction by the die of the second rivet-point stamping station, the portions on the two sides of the stamping position on the inner bottom wall are pressed and piled up toward the stamping position, and the width dimension of the convex arc top wall 1121 is larger than the width dimension of the stamping dent 1111 by combining the enlarging effect of the thickness of the inner bottom wall of the overlapped-rivet-point groove 111 on the stamping contour, the convex arc top wall 1121 cannot be completely embedded into the stamping dent 1111. That is, the depression depth of the clinch point groove 111 in the present embodiment refers to the distance from the rest of the bottom wall of the clinch point groove 111 excluding the punched indentation 1111 to the notch of the clinch point groove 111.

With continued reference to fig. 3, the preparation method may further include:

step S103, stacking and arranging a plurality of core singlechips 110 in sequence, and embedding the stacking rivet point protrusion 112 of the following core singlechip 110 into the stacking rivet point groove 111 of the preceding core singlechip 110, so as to obtain the self-fastening core structure 100 with gaps between adjacent core singlechips 110.

Referring to fig. 1 in combination, the process of stacking a plurality of core individual pieces 110 to form the self-fastening core structure 100 is to sequentially stack the plurality of core individual pieces 110, and partially embed the convex arc top wall 1121 of the following core individual piece 110 into the punching indentation 1111 of the preceding core individual piece 110. The positioning of the stacking process of the plurality of core pieces 110 is achieved equivalent to the positioning of the convex arc top wall 1121 by the punching of the dent 1111 to secure the stacking effect.

With continued reference to fig. 3, the preparation method may further include:

step S104, tempering the self-fastening core structure 100 and/or vacuum impregnating the self-fastening core to form a secondary coating on the surfaces of the plurality of core pieces 110.

Step S105, compacting the self-fastening core structure 100 along the stacking direction of the plurality of core individual pieces 110 to eliminate gaps existing between the adjacent core individual pieces 110.

It will be appreciated that heat can reach the inside of the structure from the gaps between adjacent core pieces 110 during the tempering process, so that the internal and external temperatures of the self-clinching core structure 100 are uniform. And when carrying out the dip coating processing, the lacquer liquid can reach inside the structure by the clearance between the adjacent iron core monolithic 110 to all form the secondary coating at the two sides of iron core monolithic 110, thereby fill the coating that leads to in punching press and stacking process and peel off, increase the inter-chip resistance, reduce the iron loss, promote the quality.

In summary, the method for manufacturing the self-locking iron core structure provided in this embodiment can manufacture the self-locking iron core structure 100 with better tempering effect and convenient secondary coating.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The preparation method of the self-buckling iron core structure is characterized by comprising the following steps of:

stamping a plurality of core pieces (110) at a first riveting point stamping station, such that a plurality of the core pieces (110) respectively form a stacking riveting point groove (111) and a stacking riveting point protrusion (112) on respective opposite sides;

stamping the inner bottom walls of a plurality of the stacking riveting point grooves (111) at a second riveting point stamping station, so that the height of the stacking riveting point protrusions (112) is increased to exceed the concave depth of the stacking riveting point grooves (111);

and a plurality of iron core singlechips (110) are sequentially stacked and arranged, and the stacking riveting point bulges (112) of the following iron core singlechips (110) are embedded into the stacking riveting point grooves (111) of the preceding iron core singlechips (110), so that a self-buckling iron core structure (100) with gaps between the adjacent iron core singlechips (110) is obtained.

2. The method of manufacturing a self-fastening core structure according to claim 1, wherein the step of punching the inner bottom walls of the plurality of stacked-riveting-point grooves (111) at the second-riveting-point punching station such that the protrusion height of the stacked-riveting-point protrusions (112) increases to exceed the recess depth of the stacked-riveting-point grooves (111) includes:

and stamping and forming a stamping dent (1111) on the inner bottom wall of the overlapped-riveting-point groove (111) at the second riveting-point stamping station so that the top wall of the overlapped-riveting-point bulge (112) is raised to form a convex arc top wall (1121).

3. The method of manufacturing a self-fastening core structure according to claim 2, wherein the step of stacking a plurality of the core individual pieces (110) in order such that the overlap rivet point protrusion (112) of the core individual piece (110) at the rear is embedded in the overlap rivet point groove (111) of the core individual piece (110) at the front comprises:

a plurality of the core individual pieces (110) are stacked in order, and the convex arc top wall (1121) of the following core individual piece (110) is partially embedded in the punching dent (1111) of the preceding core individual piece (110).

4. The method of manufacturing a self-fastening core structure according to claim 1, wherein after the step of sequentially stacking a plurality of the core individual pieces (110) and embedding the clinch-point protrusions (112) of the core individual pieces (110) that follow in front into the clinch-point grooves (111) of the core individual pieces (110), the method further comprises:

tempering the self-fastening iron core structure (100) and/or vacuum impregnating the self-fastening iron core to form a secondary coating on the surfaces of a plurality of iron core single pieces (110).

5. The method of manufacturing a self-clinching iron core structure according to claim 4, wherein after the step of tempering the self-clinching iron core structure (100) and/or vacuum-painting the self-clinching iron core to form a secondary coating layer on the surfaces of a plurality of the iron core single pieces (110), the method further comprises:

the self-fastening core structure (100) is compacted along a stacking direction of a plurality of core individual pieces (110) to eliminate gaps existing between adjacent core individual pieces (110).

6. The self-buckling iron core structure is characterized by being prepared by the preparation method of the self-buckling iron core structure according to any one of claims 1-5, and comprises a plurality of iron core single sheets (110) which are stacked, wherein a gap exists between any two adjacent iron core single sheets (110).

7. The self-fastening core structure according to claim 6, wherein a plurality of core single pieces (110) are respectively provided with a snap-riveting point groove (111) and a snap-riveting point protrusion (112) on opposite sides thereof, and a recess depth of the snap-riveting point groove (111) is smaller than a protrusion height of the snap-riveting point protrusion (112);

the overlapping riveting point protrusion (112) of one of any adjacent two iron core singlechips (110) is embedded into the overlapping riveting point groove (111) of the rest one and is abutted against the inner bottom wall of the overlapping riveting point groove (111).

8. The self-clinching core structure according to claim 7, wherein the clinching point protrusion (112) has a convex arc top wall (1121), the convex arc top wall (1121) of one of any adjacent two core pieces (110) abutting against an inner bottom wall of the clinching point groove (111) of the remaining one.

9. The self-fastening core structure according to claim 8, wherein the stacking rivet point protrusion (112) further has a first side wall (1122) and a second side wall (1123) disposed at an included angle, opposite sides of the protruding arc top wall (1121) are respectively connected to the first side wall (1122) and the second side wall (1123), and two inner side walls of the stacking rivet point groove (111) of one of any two adjacent core singlechips (110) and the first side wall (1122) and the second side wall (1123) of the remaining one form a gap respectively.

10. The self-fastening core structure according to claim 8, wherein the middle position of the inner bottom wall of the staking point recess (111) has a punched dimple (1111), and the convex arc top wall (1121) of one of any adjacent two core pieces (110) is partially embedded into the punched dimple (1111) of the remaining one.