Electrical steel Electrical steel silicon steel is mainly smelted in an oxygen converter (electric arc furnace can also be used), combined with vacuum treatment of molten steel and technology (see refining outside the furnace, using mold casting or continuous casting. According to different uses, the silicon is changed during smelting (.~ .%) and aluminum (.~.%) content to meet different magnetic requirements. The amount of silicon and aluminum in high-grade silicon steel sheets is increased accordingly. Carbon, sulfur and inclusions are minimized.
Magnetic properties of cold-rolled silicon steel sheets , surface quality, filling factor and punching performance are better than hot-rolled silicon steel sheets, and can be produced in rolls. China uses one-time rapid hot rolling at a low temperature of about ℃ and stack annealing under hydrogen protection to manufacture hot-rolled silicon steel sheets, with a high yield rate , the surface quality and magnetism of the finished product are better.
The motor works in a running state, and the iron core is composed of a stator and a rotor made of toothed circular punched sheets. The electrical steel plate is required to be magnetically isotropic, so Made of non-oriented cold-rolled electrical steel or hot-rolled silicon steel. Generally required vertical and horizontal iron loss difference %, magnetic induction difference %.
The transformer works in a static state. The core of large and medium-sized transformers is made of strips Stacked, some distribution transformers, current and voltage transformers and pulse transformers are made of wound cores, which ensures cutting and magnetization along the rolling direction of the electrical steel plate, so they are all made of cold-rolled oriented silicon steel.
Good punching properties
When users use electrical steel plates, the punching and shearing workload is heavy, so the electrical steel plates are required to have good punching properties, which is especially important for micro and small motors. Good punching properties can improve the punching die and The service life of the scissors ensures the accurate size of the punching and shearing pieces and reduces the burrs of the punching and shearing pieces.
The factors that affect the punching performance mainly include) punching die or scissors material. For example, the punching performance of cemented carbide dies is more than double that of tool steel dies. ) The distance between the punch and the die. The appropriate spacing is generally %~% of the thickness of the steel plate. ) Types of lubricants used for film processing. ) punching shape. ) Type and quality of insulation film on steel plate surface. ) The hardness of the steel plate, etc. The latter two factors are related to the quality of electrical steel plates.
The surface of the steel plate is smooth, flat and uniform in thickness
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35W330 electrical steel thin strip grade