Method for improving yield of sintered square frame through hole type magnetic cores

Abstract

The invention discloses a method for improving the yield of sintered square frame through hole type magnetic cores. The method comprises the following steps of: tidily stacking crude blanks of flat plate type magnetic cores to be sintered on a zirconium sheet used for loading, wherein the material of the crude blanks of the flat plate type magnetic cores is the same as that of the crude blanks of the square frame through hole type magnetic cores to be sintered; tidily stacking the crude blanks of the square frame through hole type magnetic cores to be sintered on the crude blanks of the flat plate type magnetic cores to be sintered; sending the stacked crude blanks of the square frame through hole type magnetic cores and the crude blanks of the flat plate type magnetic cores into a sintering furnace through the zirconium sheet for loading to sinter the crude blanks; and collecting the sintered square frame through hole type magnetic cores and the sintered flat plate type magnetic cores respectively. The method has the advantages that: a quality defect caused by uneven shrinkage caused by friction is not generated at a contact face of the sintered square frame through hole type magnetic cores, because the crude blanks of the flat plate type magnetic cores are placed on the crude blanks of the flat plate type magnetic cores which are made of the same material as the flat plate type magnetic cores to be sintered together, and the principle that the shrinkage rate is the same is adopted.

Description

technical field [0001] The invention relates to a process method of powder metallurgy, in particular to a method for improving the yield rate of a sintered square frame through-hole magnetic core. Background technique [0002] The magnetic core is a sintered magnetic metal oxide composed of various iron oxide mixtures. For example, manganese-zinc ferrite and nickel-zinc ferrite are typical core body materials. Manganese-zinc ferrites are characterized by high magnetic permeability and high magnetic flux density, and have low loss characteristics at frequencies below 1MHz. Nickel-zinc ferrite has the characteristics of extremely high resistivity, low magnetic permeability of less than a few hundred, and low loss at frequencies higher than 1MHz. Ferrite cores are used in coils and transformers in various electronic devices. [0003] In actual industrial production, powder metallurgy methods are used to manufacture magnetic cores of various shapes that can be applied to spec...

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Problems solved by technology

[0004] Now, when using powder metallurgy to manufacture square frame through-hole magnetic cores, before sintering the green body of the square frame through-hole magnetic core after pressing, generally put the green body of the square frame through-hole magnetic core On the zirconium sheet, and then put it into the furnace for sintering, the green embryo will shrink to a certain extent, and at the same time, the bottom will rub against the zirconium sheet, resulting in inconsistent shrinkage, resulting in abnormal dimensions due to deformation, resulting in a decrease in yield and an increase in cost

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