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2. 发明公开

EP1036625A1 TAPER TAP FOR PIPE OF MATERIAL OF HIGH HARDNESS 有权
标题翻译：用于高硬度材料管的锥形管嘴
公开(公告)号：EP1036625A1
公开(公告)日：2000-09-20
申请号：EP98947956.3
申请日：1998-10-19
申请人： OSG Corporation
发明人： KATO, Kazumi
IPC分类号： B23G5/06
CPC分类号： B23G5/06 , B23G2200/04 , B23G2200/28 , Y10T408/904 , Y10T408/90467 , Y10T408/9048
摘要： A high durability taper tap for pipe threads which can cut threads in a pipe made of a hard material having the hardness of approximately 50HRC is provided. The sum Σγ of the width angle of cutters is set approximately 130°. By setting the width of each cutter large, a high strength and rigidity are achieved. Since the rake angle of the cutting edge α is set approximately -20°, the cutter angle β defined by the rake face 8 and the peripheral relief becomes more than 90° so that the strength and rigidity of the cutting edge 6 are enhanced. In addition, since the taper of the bottom of the flutes 4 is set in a ratio of 1/16, approximately equal to that of the taper of the thread portion 2, the rake angle α of all of the cutting edges 6 from the smaller end to the larger end of the thread portion 2 becomes equal so that all of the cutting edges 6 can equally cut the threads. Further, the diameter Df of the bottom of the flutes of the top end portion 1a is set approximately 60% of the smaller end of the thread portion 2, which is larger than that of the common tapping tool. Owing to this configuration, the taper tap for pipe threads of hard material having an excellent strength, rigidity and hard wearing property can be achieved.
摘要翻译：提供一种用于管螺纹的高耐久性锥形丝锥，其可以切割由硬度约为50HRC的硬质材料制成的管中的螺纹。刀具宽度角度的总和Σγ约为130°。通过将每个刀具的宽度设置得大，可以获得高强度和高刚性。由于切削刃α的前角α被设定为大约-20°，所以由前刀面8和周向后角限定的切削角β变得大于90°，从而提高了切削刃6的强度和刚性。另外，由于将槽4的底部的锥度设定为与螺纹部2的锥度大致相同的1/16的比例，因此所有切削刃6的前角α都小于端部到螺纹部分2的较大端变得相等，使得所有的切削刃6能够均匀地切削螺纹。此外，顶端部分1a的凹槽底部的直径Df被设定为大于普通攻丝工具的较小端部的螺纹部分2的较小端部的60％。由于这种构造，可以实现具有优异的强度，刚度和耐磨性的用于硬质材料管螺纹的锥形头。

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