CN113996693B - A method for preparing a motor iron core - Google Patents

Abstract

The invention relates to a method for preparing a motor iron core, which comprises the following steps: step S1: drawing and forming the plate; step S2: shaping the different-layer drawn and formed part; and step S3: carrying out compact compaction and fitting treatment on the integrally formed piece; and step S4: and machining the tightly attached formed part to obtain the motor iron core. The method for preparing the motor iron core can reduce the magnetic resistance, reduce the heat loss of the motor, effectively improve the forming quality of the motor iron core, and greatly prolong the service life of the motor by applying the iron core to prepare the motor; meanwhile, the problems of burrs, tearing and the like in the traditional method can be avoided, the forming quality of the motor iron core is effectively improved, and the method is simple in process and easy to operate.

Description

A method for preparing a motor iron core

technical field

The invention relates to the technical field of motors, in particular to a method for preparing a motor iron core.

Background technique

At present, most motors use non-oriented silicon steel material as the iron core. The preparation of the motor iron core usually goes through the following process: First, the non-oriented silicon steel sheet is punched continuously at high speed by a punching die to form the shape required for the motor iron core, and then a large amount of punching is made by riveting, welding, gluing, etc. The punches are fixed. After part of the iron core is fixed, in order to improve its magnetic properties, it will be annealed for stress relief, and after being inserted into the coil winding, it will be hot-press assembled to fix it into the motor casing.

However, the blanking process may cause burrs, tearing, bending, springback, etc., which will affect the mechanical properties of non-oriented silicon steel sheets, and the production efficiency is low; and the motor core structure prepared by riveting, welding, and cementation has The large magnetic resistance makes the temperature of the motor too high during use, making it impossible to use it for a long time, which affects the working efficiency of the motor.

Therefore, how to improve production efficiency, reduce reluctance, and reduce heat loss during motor operation has become one of the problems to be solved urgently by those skilled in the art.

Contents of the invention

In view of the above problems, the purpose of the present invention is to provide a method for preparing a motor iron core. The formed part obtained by the present invention can reduce the reluctance, and at the same time solve the problems of serious heat generation in the original motor.

The technical scheme that the present invention adopts is as follows:

A method for preparing a motor iron core proposed by the present invention comprises the following steps:

S1: Deep drawing of the sheet metal; specifically includes

(S1.1) cutting and blanking the blank to obtain the sheet;

(S1.2) stacking the sheets to obtain multi-layer sheets;

(S1.3) Deep-drawing the multi-layer sheet material by using a deep-drawing die to obtain a multi-layer deep-drawing formed part;

S2: Using a shaping mold to shape the multi-layer deep-drawing formed part to obtain a multi-layer shaped part that is tightly fitted and the bottom fillet is approximately transformed into a right angle;

S3: Perform tight compaction and bonding treatment on multi-layer plastic shaped parts; specifically include

(S3.1) Selecting multi-layer plastic shaped parts for nesting;

(S3.1) Carrying out tight compaction and bonding of the nested multi-layer shaping shaped parts to obtain a tightly fitted shaped part;

S4: Machining the tightly fitted formed parts to obtain the motor core.

Further, in the step (S1.2), the stacking of the deep-drawn sheets adopts single-layer stacking or multi-layer stacking.

Further, in the step (S1.3), the deep drawing adopts conventional deep drawing or vibration energy field assisted deep drawing or magnetic field assisted deep drawing or electric field assisted deep drawing.

Further, the drawing die includes a punch, a binder ring and a die; the binder ring is coaxially arranged above the die; the punch is coaxially arranged in the axial center of the binder ring and the die ; During deep drawing, the sheet material is placed between the blank holder and the die, and under the action of the punch, the sheet material placed between the die and the blank holder produces plastic deformation, and is constantly drawn by the punch The gap between the punch and the die forms a deep-drawn part.

Further, the shaping die includes a shaping pressure ring, a shaping punch, a shaping die and a base; the shaping die is coaxially set on the lower part of the shaping pressure ring; the shaping punch is coaxially arranged on the shaping pressure ring and In the shaft center of the shaping die; the base is arranged at the bottom end of the shaping die; the drawn part is placed between the bottom end of the shaping die and the shaping pressure ring; , the sheet material in the rounded corner area produces plastic deformation, and with the continuous pressing of the shaping pressure ring, the gap in the rounded corner area is gradually eliminated, and the rounded corner is transformed into a shaped shape that is close to the right angle.

Compared with the prior art, the present invention has the following beneficial effects:

Compared with the traditional motor iron core forming method, the method for preparing a motor iron core proposed by the present invention can reduce the reluctance of the formed parts obtained by the present invention, and at the same time solve the serious problem of heat generation in the original motor, thereby reducing the The heat loss of the small motor can greatly extend the working life of the motor. The method proposed by the invention can effectively avoid problems such as burrs and tears in the traditional method, and effectively improve the forming quality of the motor iron core, and the method for preparing the motor iron core proposed by the invention has a simple process and is easy to operate.

Description of drawings

Fig. 1 is the method flowchart of a kind of motor iron core preparation that the present invention proposes;

Fig. 2 is the schematic diagram of electric motor iron core deep-drawing forming of the present invention;

Fig. 3 is the schematic diagram of shaping die among the present invention;

Fig. 4 is a schematic diagram of the distribution of magnetic force lines of the motor iron core prepared by the present invention and the motor iron core prepared by the existing method.

Among them, reference signs: 1-punch; 2-binder ring; 3-sheet; 4-die; Die; 9-base; 10-shaping shaped parts; 11-circular piece of iron core; 12-arc-shaped piece of iron core; 13-welding point; 14-magnetic force lines;

Detailed ways

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

A method for preparing a motor iron core proposed by the present invention, as shown in Figures 1 to 3, the specific implementation steps are as follows:

S1: Deep-drawing the sheet metal; the specific process is as follows

(S1.1) Cut and blank the blank to obtain a sheet to be drawn; specifically, in this embodiment, a wire cutting tool is used to cut and blank a non-oriented silicon steel sheet with a thickness of 0.5 mm to obtain a circular sheet to be drawn. Sheet 3;

(S1.2) Stack the sheets 3 to be drawn to obtain a multi-layer sheet; the stack of sheets 3 to be drawn can be stacked with single-layer plates or multi-layer plates; specifically, this implementation In the example, a three-layer board stacking method is used to stack the circular sheet 3 to be drawn to obtain a three-layer board;

(S1.3) Use a deep drawing die to draw and form the multi-layer sheet material to obtain a multi-layer deep drawn formed part; in this embodiment, the deep drawing die includes a punch 1, a blank holder 2 and a die 4; the blank holder 2 is coaxially arranged above the die 4; the punch 1 is coaxially arranged in the axial center of the blank holder 2 and the die 4; the deep drawing can adopt conventional deep drawing, Vibration energy field assisted deep drawing forming, magnetic field assisted deep drawing forming or electric field assisted deep drawing forming; specifically, in this embodiment, the ultrasonic vibration assisted deep drawing forming method is used to carry out deep drawing forming on the three-layer sheet material 3, first, start the ultrasonic The vibration device makes the three-layer sheet material 3 in a certain vibration state; then, the three-layer sheet material 3 in a certain vibration frequency state is placed between the die 4 and the blank holder 2 under the action of the punch 1 3 produces plastic deformation, and is continuously drawn into the gap between the punch 1 and the die 4 by the punch 1 to form a three-layer deep-drawing formed part 5;

S2: Use a shaping mold to shape the different layers of the deep-drawing formed part 5 to obtain a multi-layer shaped forming part that closely fits and the bottom fillet is approximately transformed into a right angle; in this embodiment, the shaping mold includes a shaping pressure ring 6. The shaping punch 7, the shaping die 8 and the base 9; the shaping die 8 is coaxially set on the lower part of the shaping pressure ring 6; the shaping punch 7 is coaxially arranged on the shaping pressure ring 6 and the shaping concave In the axial center of the mold 8; the base 9 is arranged at the bottom of the shaping die 8; the three-layer drawing forming part 5 is placed at the inner bottom of the shaping die 8, and the top of the outer circumference is located at the bottom of the inner circumference of the shaping pressure ring 6 end; specifically, in this embodiment, under the action of the shaping pressure ring 6 and the shaping punch 7 of the three-layer deep-drawing forming part 5, the sheet material in the fillet area is plastically deformed, and as the shaping pressure ring 6 continues to Pressing down, the gaps in the rounded corner area are gradually eliminated to form a rounded corner that transforms into a three-layer plastic molded part 10 that closely fits approximately at right angles.

S3: Perform tight compaction and bonding treatment on the multi-layer plastic shaped parts; the specific process is as follows

(S3.1) Select a multi-layer plastic forming part for nesting; specifically, in this embodiment, select two three-layer plastic forming parts 10 for nesting;

(S3.2) Compacting and bonding the nested multi-layer shaped parts to obtain a tightly fitted shaped part; specifically, two nested three-layer shaped parts in this embodiment 10 is placed between the shaping male mold 7 and the shaping concave mold 8, and as the shaping pressure ring 6 moves down, a closely fitting six-layer formed part is formed.

S4: Machining the tightly fitted formed part to obtain the motor core; specifically, in this example, the excess part of the straight wall opening of the closely fitted six-layer formed part is cut off, and the center of the bottom of the motor core is cut out The circular notch, and finally obtained the iron core of this type of linear motor.

As shown in Figure 4, it is a schematic diagram of the distribution of the magnetic field lines of the motor iron core prepared by the old and new processes. The traditional process is stamped and laminated, and then the iron core circular piece 11 and the iron core arc-shaped piece 12 are welded (or riveted, glued, etc.) Together, the iron core structure prepared by this method has a material discontinuity due to the existence of welding points 13. This discontinuity of the material increases the reluctance 15, and hinders the propagation of the magnetic force lines 14 during the operation of the motor. Moreover, the heat loss of the motor is increased, so that the motor cannot be used for a long time, which affects the working efficiency of the motor. According to the method provided by the present invention, the iron core structure prepared by machining after deep drawing, shaping, and then compaction and lamination makes the material in a continuous state. Compared with the traditional process, the magnetic resistance 15 is reduced, which is beneficial to the magnetic field lines 14 Transmission, thereby reducing the heat loss of the motor, can increase the service time of the motor, and at the same time improve the working efficiency of the motor.

The above-mentioned embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the scope of the present invention. All such modifications and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (3)

1. a method for motor iron core preparation, is characterized in that, described method comprises the steps: S1: Deep drawing of the sheet metal; specifically includes (S1.1) Cut and blank the blank to obtain the sheet; (S1.2) Stack the sheets to obtain multi-layer sheets; (S1.3) Deep-drawing the multi-layer sheet material with a deep-drawing die to obtain a multi-layer deep-drawing formed part; S2: Using a shaping mold to shape the multi-layer deep-drawing formed part to obtain a multi-layer shaped part that is tightly fitted and the bottom fillet is approximately transformed into a right angle; S3: Perform tight compaction and bonding treatment on multi-layer plastic shaped parts; specifically include (S3.1) Select multi-layer plastic moldings for nesting; (S3.1) Closely compact and fit the nested multi-layer plastic shaped parts to obtain tightly fitted shaped parts; S4: Machining the tightly fitted formed parts to obtain the motor core; In the step (S1.2), the stacking of the deep-drawn sheets adopts single-layer stacking or multi-layer stacking; In the step (S1.3), the deep drawing adopts conventional deep drawing or vibration energy field assisted deep drawing or magnetic field assisted deep drawing or electric field assisted deep drawing. 2. The method for preparing a motor core according to claim 1, wherein the drawing die comprises a punch, a binder ring and a die; the binder ring is coaxially arranged above the die ; The punch is coaxially arranged in the axial center of the blank holder and the die; when drawing, the sheet material is placed between the blank holder and the die, and placed in the die under the action of the punch The sheet between the blank holder and the blank holder is plastically deformed, and is continuously drawn into the gap between the punch and the die by the punch to form a deep-drawing formed part. 3. The method for preparing a motor iron core according to claim 1, characterized in that: the shaping mold includes a shaping pressure ring, a shaping punch, a shaping die and a base; the shaping die is coaxially sleeved At the bottom of the shaping pressure ring; the shaping punch is coaxially arranged in the shaft center of the shaping pressure ring and the shaping die; the base is arranged at the bottom of the shaping die; Between the bottom ends of the shaping pressure ring; under the action of the shaping pressure ring and the shaping punch, the sheet material in the fillet area is plastically deformed, and as the shaping pressure ring continues to press down, the gap in the fillet area is gradually eliminated and formed Rounded corners transform into shapely shapes with a close fit that approximates right angles.

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