The automatic lamination technology of motor stator and rotor iron core was proposed and successfully developed by the United States and Japan in the 1970s, which made a pioneering progress in the production and manufacturing technology of motor iron core and opened up a new way for the automatic production of high-precision iron core.

The development of this progressive die technology in China began in the mid-1980s. At first, it was based on the practical experience gained by digesting and absorbing the technology of imported molds. Later, the independent development of such molds has achieved rapid development, and gratifying results have been achieved in domestic production and manufacturing. From the original introduction of such molds to our own development of such high-grade precision molds, The technical level of precision mould in motor industry has been improved. Especially in recent ten years, with the rapid development of China's precision die manufacturing industry, modern stamping die, as a special process equipment, is becoming more and more important in contemporary manufacturing industry. The modern die technology for motor stator and rotor iron core has also developed comprehensively and rapidly. In the past, it can only be designed and manufactured in a few state-owned enterprises. Up to now, there are many enterprises that can design and manufacture such dies. Moreover, the technical level of developing such precision dies is becoming more and more perfect, and has been gradually exported to overseas, accelerating the development of modern high-speed stamping technology in China.

At present, the contemporary stamping die technology of motor stator and rotor iron core in China is mainly reflected in the following aspects, and its design and manufacturing level has been close to the technical level of similar dies abroad:

1. Overall structure of progressive die for stator and rotor iron core of motor (including double guide device, unloading device, guide device, step guide device, limit device, safety detection device, etc.);

2. Structural form of core riveting point;

3. The progressive die is equipped with automatic riveting technology, torsion and rotation technology;

4. Punching out the dimensional accuracy and iron core fastness of the iron core;

5. Manufacturing accuracy and splicing accuracy of main parts on progressive die;

6. Degree of selecting standard parts on the die;

7. Selection of main parts and materials on the die;

8. Processing equipment for main parts of mould.

With the continuous development trend of motor types, independent innovation and the upgrading of machining technology, the requirements for the precision of motor iron core are higher and higher, which clearly puts forward higher technical requirements for the stamping die of motor iron core. Its development trend is:

1. The innovation of die structure should become the main melody of the development of modern die technology for motor stator and rotor iron core;

2. The overall level of die is developing towards ultra-high precision and higher technology;

3. The innovation and development of the technology of large rotation plus torsion oblique riveting of the stator and rotor iron core of the motor;

4. The stamping die for stator and rotor core of motor is developing in the direction of multi layout, no overlapping edge and less overlapping edge stamping technology;

5. With the continuous development of high-speed precision punch technology, the die should meet the needs of higher stamping speed.