A power inductor pre-pressing mold and a method for manufacturing a power inductor

By adding an auxiliary pressing process after powder filling and a pre-pressing mold with an inverted cup shape, the problems of insufficient density of inductor powder and easy deformation of coils in the existing technology are solved, achieving high density and low loss performance of inductors and meeting the needs of miniaturization.

CN116053015BActive Publication Date: 2026-06-09NINGBO ZHONGKE BIPULASI NEW MATERIAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NINGBO ZHONGKE BIPULASI NEW MATERIAL TECH CO LTD
Filing Date
2022-12-07
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing technologies for fabricating small-sized, high-inductance integral molded power inductors suffer from problems such as insufficient powder compaction leading to poor magnetic shielding, exposed coils, and poor inductor reliability. Furthermore, increasing the molding pressure can easily cause coil deformation or breakage, affecting inductor performance.

Method used

By employing a specific power inductor pre-pressing mold and preparation method, an auxiliary pressing process is added after powder filling. Utilizing an inverted cup-shaped structure and double powder filling technology, the sidewalls and top of the inductor are pressed separately to increase powder density and avoid coil deformation and copper leakage.

Benefits of technology

The density of the inductor has been increased, DC resistance and losses have been reduced, and the overall performance of the inductor has been improved to meet the needs of miniaturization.

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Abstract

The present application relates to the technical field of electronic components, in particular to a power inductance pre-pressing mold and a preparation method of power inductance, comprising a first upper mold base and a second upper mold base, a plurality of first upper mold pressing heads are arranged on the first upper mold base, a second upper mold pressing head fixing plate is connected below the second upper mold base, a second upper mold pressing head is arranged on the second upper mold pressing head fixing plate, the pressing end of the first upper mold pressing head can be downwardly extended into the second upper mold pressing head to form an inverted cup-shaped structure together with the side wall of the second upper mold pressing head; a middle mold plate base and a middle mold plate are arranged on the middle mold base fixing plate, the middle mold plate is provided with a forming hole corresponding to the inverted cup-shaped structure, the present application adds an auxiliary pressing process before heat pressing after powder filling, and the filled powder is pre-pressed by using a specific pre-pressing mold, so that the side wall density is improved, and the defects caused by the existing powder filling and pressing process are improved.
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