As a typical mould with high efficiency, high precision and long life, the progressive die for stator and rotor core has been widely used. As the key to the success of die design, strip layout basically determines the structure of the whole die and directly affects the production quality of parts. In actual production, there are many factors affecting strip layout, which are usually summarized as follows for the stator and rotor core progressive die

(1) Product structure.

It is the main factor affecting layout. It generally includes:

① The shape, size and accuracy requirements of stator, rotor and auxiliary stator;

② Whether the stator and rotor are required to be loose pieces or iron core (divided into stator and rotor need to be overlapped, one overlapped and one loose piece, both are loose pieces), which will affect the design of forming process and blanking process;

③ If the rotor needs to be twisted, the position of the torsion mechanism should be considered, and the empty position may need to be added during layout.

(2) Layout type.

Layout usually uses single row, double row, but also three row, the material utilization rate is a main standard.

(3) Die structure factors.

For the products that need to be twisted and riveted, the space of the torsion mechanism should be considered, and the empty station often needs to be added. In the motor iron core progressive die, the pressing plate is generally used to fix the punch on the fixed plate of the punch, and the pressing plate is connected by screws. Whether there is enough pressing plate space should be considered when layout. It will affect the structure of the die whether the iron core is exported by belt or cage.

(4) Special requirements of customers.

It is mainly the requirements of customers according to their own production situation. For example, in order to reduce the cost, when the silicon steel sheet material used for blanking has thickness uniformity error, the customer usually requires 180 large rotations in the process of riveting to ensure the height tolerance of the iron core, which will affect the layout.

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