GREEN COMPACT, POWDER MAGNETIC CORE, AND MANUFACTURING METHODS THEREFOR

• Main Authors: ISHIHARA CHIO, OSHIMA YASUO, TAMURA YASUHARU, YAMADA SHOJI
• Format: Patent
• Language: English; Japanese
• Published: 07.09.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; INDUCTANCES; MAGNETS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS

To provide a green compact, a powder magnetic core, and a manufacturing method therefor that can suppress density differences even in complex shapes.SOLUTION: A green compact 1 includes a middle leg 21 and outer legs 22a, 22b arranged side-by-side so that their directions of extension are parallel to each other, a yoke portion 3 that connects the middle leg 21 and the outer legs 22a, 22b, and a recess 4 provided on an end surface perpendicular to the direction of extension of the middle leg 21 and the outer legs 22a, 22b and perpendicular to the direction of alignment of the middle leg 21 and the outer legs 22a, 22b. An extended end surface 23 of the middle leg 21 and the outer legs 22a, 22b, an inner circumferential surface 31 of the yoke portion 3, and a back surface 32 of the yoke portion 3 are press surfaces to be pressed by upper or lower punches. Variations in length of the middle leg 21 and the outer legs 22a, 22b, including the yoke portion 3 in the extending direction of the middle leg 21 and the outer legs 22a, 22b are 0.57% or less.SELECTED DRAWING: Figure 1 【課題】複雑な形状であっても密度差を抑制できる圧粉成形体、圧粉磁心、圧粉成形体及び圧粉磁心の製造方法を提供する。【解決手段】圧粉成形体１は、延び方向が平行になるよう横並びに配置された中脚２１及び外脚２２ａ、２２ｂと、中脚２１及び外脚２２ａ、２２ｂを連結するヨーク部３と、中脚２１及び外脚２２ａ、２２ｂの延び方向と直交し、かつ、脚部中脚２１及び外脚２２ａ、２２ｂの横並び方向と直交する端面に設けられた凹み部４と、を備える。中脚２１及び外脚２２ａ、２２ｂの延び先端面２３と、ヨーク部３の内周面３１と、ヨーク部３の背面３２が上パンチ又は下パンチで押圧されるプレス面であり、中脚２１及び外脚２２ａ、２２ｂの延び方向におけるヨーク部３を含めた中脚２１及び外脚２２ａ、２２ｂの長さのばらつきが、０．５７％以下である。【選択図】図１