A method for preventing high-silicon electrical steel cold-rolled strip breakage

Abstract

The invention relates to the field of production methods of electrical steel, and particularly relates to a method for preventing high-silicon electrical steel from being broken during cold rolling. The method is characterized in that specific to high-silicon electrical steel with the silicon content of above 2.0 and the thickness of 1.0-4.0 mm, cutters are arranged at the left side and the right side of a hot-rolled strip for performing a milling operation, an included angle alpha is formed between each cutter shaft and the moving direction of the hot-rolled strip, a rotating direction of a blade on each cutter is opposite to the moving direction of the hot-rolled strip, the moving speed of the hot-rolled strip is 5-40 m / min, when the depth of a side crack is less than 10 mm, a cutter is arranged at one side of the hot-rolled strip, and when the depth of a side crack is more than 10 mm, more than two cutters are arranged at one side of the hot-rolled strip for performing milling simultaneously. Compared with the prior art, the method has the beneficial effects of reducing the probability of strip breakage of high-silicon steel in a cold-rolling process, increasing the yield of high-silicon steel, being free from preheating and capable of realizing cold rolling at normal temperature, further reducing the probability of cracks by removing corner angles of a steel plate which is cut, and being capable of flexibly adjusting the trimming amount.

Description

A method for preventing high-silicon electrical steel cold-rolled strip breakage technical field The invention relates to the field of production methods of electrical steel, in particular to a method for preventing high-silicon electrical steel from being cold-rolled and broken. Background technique In order to give full play to the performance of cold-rolled electrical steel, its hot-rolled sheet needs to be normalized before cold-rolling. In order to avoid strip breakage during cold rolling, the normalization process adopts disc shearing edge treatment. Generally, if there are no cracks at the edge, stress concentration is not easy to occur during cold rolling, and strip breakage can be avoided. When the silicon content reaches more than 2.5, the yield of finished products is seriously affected due to the high rate of broken belts, which greatly increases the production cost. When the silicon content reaches about 3.20, cold rolling is difficult to carry out. For the ...

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Problems solved by technology

Since the cutting edge of the disc shear is in surface contact with the edge of the steel strip, the trimming amount cannot be adjusted according to the edge during the production process. The trimming amount can only be adjusted before production, and the adjustment time is long, and the shearing amount is the smallest. Generally, it cannot be less than 10mm. If the shearing amount is too small, it cannot be cut, and the hot-rolled edge cracks are generally less than 10mm, and some parts without edge cracks are cut more, which increases the loss and reduces the yield. Can reach about 85%

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