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1. 发明专利

JP2003311520A Step drill 有权
标题翻译：步骤钻
公开(公告)号：JP2003311520A
公开(公告)日：2003-11-05
申请号：JP2002127645
申请日：2002-04-26
申请人： Jae-Eun Chang , Sung-Lim Ko , 張宰銀 , 高聖林
发明人： KO SUNG-LIM , CHANG JAE-EUN
IPC分类号： B23B51/00 , B23B51/02
CPC分类号： B23B51/02 , B23B2251/18 , Y10T408/9065
摘要： PROBLEM TO BE SOLVED: To provide a step drill, which can minimize the formation of burrs in drilling. SOLUTION: The step drill has a stepped part having a step diameter (D2) smaller than the diameter (D1) of a drill body. The stepped part is tapered such that its diameter decreases toward the tip end side with respect to the drill body. The step drill is configured such that burrs produced at the penetration of the drill through a workpiece are removed by the stepped part. The stepped part is determined by a step angle (θ2) and the amount of the step (D1-D2) that is the difference between the diameter of the drill body and the diameter of the stepped part. COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：提供可以最小化钻孔毛刺形成的阶梯钻。解决方案：步进钻具具有阶梯部分，其阶梯直径（D2）小于钻体的直径（D1）。阶梯部分是锥形的，使得其直径相对于钻头主体朝向顶端侧减小。阶梯钻被构造成使得在钻头通过工件的穿透处产生的毛刺被阶梯部分移除。台阶部分由步进角（θ2）和作为钻头直径与台阶部分直径之差的台阶（D1-D2）的量决定。版权所有（C）2004，JPO

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