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    • 31. 发明授权
    • Method of forming an outwardly inverted peripheral edge on a preformed
metal lid
    • 在预成型金属盖上形成向外反转的周边边缘的方法
    • US4420283A
    • 1983-12-13
    • US304646
    • 1981-09-23
    • Willem P. Post
    • Willem P. Post
    • B21D51/44B21D51/26
    • B21D51/44
    • The invention relates to a method whereby a preformed metal lid which is intended for a tin, e.g. a paint tin, and of which at least one peripheral portion is axially deepened, is formed with a radially outwardly inverted peripheral edge with respect to the lid axis. The object of this invention is to provide a method in which the outwardly inverted peripheral edge can be formed with very close dimensional tolerances. To this end the invention provides a method of the type referred to hereinbefore, which is characterized in that the lid is held in tightly fitting relationship in all directions in a multipart die at least by its deepened peripheral portion, except in the zone where the inverted peripheral edge is to be formed and at least at the inside of the base of said peripheral portion, and said base is pressed by art of the die acting as a punch against the part of the die situated opposite the inside of the base.
    • 本发明涉及一种用于锡的预成型金属盖的方法,例如, 涂料锡,其至少一个周边部分被轴向加深,其形成有相对于盖轴线的径向向外反转的周边边缘。 本发明的目的是提供一种方法,其中可以以非常紧密的尺寸公差形成向外反转的周边边缘。 为此,本发明提供了一种上述类型的方法,其特征在于,至少通过其加深的周边部分,盖子在多部分模具中在所有方向上保持紧密配合的关系,除了在反向 至少在所述周边部分的基部的内侧形成周边边缘,并且所述基座被作为冲头的模具的技术压在位于与基座的内侧相对的模具的部分上。