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    Methods for forming magnetic cores
    1.
    发明授权
    Methods for forming magnetic cores 失效
    形成磁性线的方法

    公开(公告)号：US3629940A

    公开(公告)日：1971-12-28

    申请号：US3629940D

    申请日：1970-02-02

    申请人： CENTRAL TRANSFORMER INC

    发明人： WINTER DAVID F

    IPC分类号： B21D22/02 ,  B21D53/74 ,  H01F41/02 ,  H01F7/06

    CPC分类号： B21D22/025 ,  B21D53/74 ,  H01F41/024 ,  Y10T29/49078 ,  Y10T29/5317

    摘要： Hydraulic press apparatus and methods for die-forming magnetic cores from a wound circular configuration to a generally rectangular configuration are described. The press is constituted by a pair of opposed relatively movable platens, each having a pair of L-shaped die bar assemblies pivotally mounted thereon and arranged so that the horizontal legs of the bars on each platen are interdigitatable and the vertical legs of the bars on one of the platens are interdigitatable with the vertical legs of the bars on the other platen, the L-bars being arranged on their respective platens so as to define an open rectangle. A corner block of chevron, curved or triangular cross section is optionally removably mounted in the inner apices of the L-bars for shaping the outside corners of the cores during the pressing operation, and a rectangular window block is insertable into and extractable from the center opening of the core by a transverse hydraulic ram thereby to form a generally rectangular core window. To form a transformer core, a circular wound loop of magnetizable material is inserted in the press between the pairs of opposed L-bars with the desired corner blocks and window form, and the lower platen is advanced toward the upper platen. The core yokes are restrained by the vertical L-bar legs to a dimension corresponding to the overall desired core length and the width of the core is determined by the core build and the width dimension of the window form. As the core is pressed, the magnetic strip is forced to assume the desired configuration in accordance with the size and configuration of the corner blocks and window form. The corner blocks may then be partially or completely removed from the corner areas, the window form reduced in thickness and the core again pressed to overbend the core yokes and sharply bend the core corners.