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    • 2. 发明公开
    • BOHRER
    • Bohrer的
    • EP3038776A1
    • 2016-07-06
    • EP14757904.9
    • 2014-08-25
    • MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG
    • KRENZER, UlrichTOPAL, Serkan
    • B23B51/02
    • The invention relates to a drill bit (1) having a center axis (11), a front face, a peripheral surface, at least two main cutting lips (17, 17') provided on the front face (3), at least two brad points (19, 19') , rake faces (37, 39), assigned to the at least two main cutting lips (17, 17') and the at least two brad points (19, 19'), flutes, at least one chisel edge, a recessed portion, and swarf guide shoulders (23a, 23b) which are assigned at least to the rake faces (39) of the at least two brad points (19, 19'). The drill bit (1) is characterized in that near the recessed portion the angle (y1, y2) between the swarf guide shoulder (23a, 23b) and the centre axis (11) diminishes as distance from the front face increases.
    • 本发明涉及一种具有中心轴线(11),前表面,外周表面,设置在前表面(3)上的至少两个主切割唇缘(17,17')的钻头(1),至少两个 ,至少两个主切割唇(17,17')和所述至少两个布氏点(19,19')的至少两个凸起点(19,19'),前倾面(37,39),至少一个凹槽 一个凿刀边缘,一个凹入部分和切屑导向肩部(23a,23b),这些肩部至少配属于至少两个锉刀尖端(19,19')的前刀面(39)。 钻头(1)的特征在于,在凹部附近,切屑引导台肩(23a,23b)与中心轴线(11)之间的角度(y1,y2)随着与前表面的距离的增加而减小。