A cleaning method for iron core used for winding ≤0.1mm thick silicon steel strip

Abstract

The invention discloses an iron core cleaning method used for winding a thick silicon steel strip with a thickness smaller than or equal to 0.1 mm. The iron core cleaning method comprises the following steps: cleaning the surface of an iron core with water for a first time; removing water drops on the surface; carrying out spraying type pickling on the cutting surface of the iron core; dropwise adding an acid solution on the surface of the iron core; cleaning with water for a second time; carrying out spraying type alkaline washing; cleaning with water for a third time; carrying out air-cooling by use of nitrogen gas; drying the iron core under a vacuum state; and cleaning a next iron core according to the steps. According to the iron core cleaning method disclosed by the invention, the end surface of the iron core is processed after cutting and grinding, scrap iron adhered between layers is removed through corrosion, a silicon steel layer on the iron core is guaranteed to be not corroded, and the surface of the iron core does not get rusty after being cleaned. With the adoption of the iron core cleaning method, service cycle is obviously prolonged, a product qualification rate is increased to be 95% or higher from original 85%; and moreover, end surface electrical resistivity of the iron core achieves 95% or higher of a theoretical value.

Description

technical field [0001] The invention relates to a cleaning method for iron cores, in particular to a cleaning method for winding iron cores with silicon steel thin strips below 0.1mm. Background technique [0002] As the most commonly used soft magnetic material, silicon steel has excellent properties in terms of magnetic permeability, saturation magnetization, and Curie temperature. Widely used in transformers, reactors, filters and other industrial equipment. However, the resistance of silicon steel is not high, so the iron core made of this material has great eddy current loss when it is used at high frequency, which affects the performance of the device. At present, the eddy current loss is reduced by reducing the thickness of the strips and increasing the resistance between the strips. However, with the reduction of the thin strip thickness of the wound iron core, especially the iron core wound with ultra-thin silicon steel strips below 0.1 mm, there are problems such...

AI Technical Summary

Problems solved by technology

When the iron core is cut and ground, the direction of force on the cutting part of the iron core is consistent, and each thin layer is obviously deformed at the cutting part, and the end faces of the layers are easily contacted after deformation, which reduces the end face resistance of the iron core. In turn, it affects the high-frequency performance of the iron core and cannot meet the requirements of users, especially high-end users.

When processing the end face of the iron core, mechanical methods are not easy to implement, and chemical corrosion is more reasonable, but the iron core is easily corroded as a whole. How to achieve the effect of separating layers without severely corroding the end face, causing end face Flatness, impact on appearance, is a technical problem