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1. 发明公开

EP1477255A1 Cemented carbide broach and broaching machine 审中-公开
标题翻译： Räumwerkzeugaus zementiertem Karbid undRäummaschine
公开(公告)号：EP1477255A1
公开(公告)日：2004-11-17
申请号：EP04010339.2
申请日：2004-04-30
申请人： Nachi-Fujikoshi Corp.
发明人： Kakutani, Soichi , Murai, Yasuhiro
IPC分类号： B23D43/00 , B23D37/10
CPC分类号： B23D37/10 , B23D43/04 , Y10T407/16 , Y10T409/4056 , Y10T409/40665
摘要： A broach (19) has a main body (1) of a cemented carbide material. On this main body, a front grip portion (5), a cylindrical portion (34) following the front grip portion and provided with a plurality of guide parts (33) in its outer periphery, a broach cutting edge portion (36) following an end (35) of the cylindrical portion and having a number of cutting edges (2), and a cylindrical extension (12) following the broach cutting edge portion and having a maximum outer periphery dimension to such an extent that the extension does not interfere with a work are integrally provided. On an end surface of the cylindrical extension (12), a load receiving shoulder (3) is formed, which leads to a rear grip portion (11) including a small-diameter part and is orthogonal to or inclined with respect to a broach axis. The load receiving shoulder (3) has a sufficient area to bear a cutting load. A broaching machine grips the rear grip portion (11) with its load receiving surface (15) abutting against the load receiving shoulder (3) of the cemented carbide broach (19). The broach, even when having a small diameter, does not suffer from an insufficient tensile strength of the front grip portion.
摘要翻译：拉刀（19）具有硬质合金材料的主体（1）。在该主体上，前握持部（5），与前把手部分相邻的圆筒部（34），在其外周设有多个引导部（33），沿着圆柱形部分的端部（35）并且具有多个切割边缘（2），以及沿着拉刀切割边缘部分的圆柱形延伸部（12），并且具有最大外周尺寸，使得延伸部不干扰整体提供了一个工作。在圆筒形延伸部（12）的端面上，形成承载台肩（3），该承载台肩（3）形成为包括小直径部分的后把手部分（11），并且相对于拉刀轴线正交或倾斜。负载承受台肩（3）具有足够的承受切削负荷的面积。一种拉削机械，其后部把手部分（11）的承载面（15）抵靠在硬质合金刀片（19）的承受承受台肩（3）上。即使具有小直径，拉刀也不会受到前把手部分的拉伸强度的不足。

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