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    • 5. 发明专利
    • Method for piercing round billet
    • 叮咬圆柱的方法
    • JP2013116503A
    • 2013-06-13
    • JP2012228579
    • 2012-10-16
    • Jfe Steel CorpJfeスチール株式会社
    • SHIRASAKI KIMIHITO
    • B21B25/04
    • PROBLEM TO BE SOLVED: To provide a loading method alternative to a pre-oxidized steel plate serving as a lubricant that insufficiently has a plug useful life extending effect with respect to a round billet having a middle to high alloy steel composition.SOLUTION: The method includes: preliminarily piercing a bottomed hole 6 with a hole diameter D of 10-30% of a billet diameter and a hole depth L of 100-500 mm in the central part of an end surface on a side where piercing is started, of the round billet 2 before being subjected to heating; and loading massive or powdery carbon steel 4 in the hole via a stopper 10 by the same weight as the weight of a virtual carbon steel film 8 with a film thickness of 0.10-1 mm which uniformly covers the whole external surface of a plug used for a piercer.
    • 要解决的问题:提供一种替代用作润滑剂的预氧化钢板的装载方法,该预制氧化钢板相对于具有中高合金钢组成的圆坯具有不足以具有插头使用寿命延长效果。 解决方案:该方法包括:在侧面端面的中央部分,预先刺穿孔径D为10-30%的坯料直径和孔深L为100-500mm的有底孔6 在开始加热之前圆形坯料2开始的地方; 并通过止动件10将大量或粉状的碳素钢4装入孔中,其重量与薄膜厚度为0.10-1mm的虚拟碳钢膜8的重量相同,均匀地覆盖用于 穿孔器 版权所有(C)2013,JPO&INPIT