公开(公告)号：US20160214184A1

公开(公告)日：2016-07-28

申请号：US14915314

申请日：2014-08-25

Applicant: MAPAL FABRIK FÜR PRÄZISIONSWERKZEUGE DR. KRESS KG

Inventor： Ulrich KRENZER ,  Serkan TOPAL

IPC: B23B51/02

CPC classification number: B23B51/02 ,  B23B2250/12 ,  B23B2251/04 ,  B23B2251/14 ,  B23B2251/18 ,  Y10T408/909 ,  Y10T408/9097

Abstract: A drill has a central axis, a front side, a circumferential surface, at least two main edges on the front side, which reach up to the circumferential surface and merge there with secondary edges, at least two central edges extending from the end of the main edge facing away from the circumferential surface, cutting surfaces associated with the main edges and central edges, chip flutes associated with the main edges and central edges and introduced into the circumferential surface, at least one cross edge adjoined by the ends of the central edges facing away from the main edges which passes through the central axis, a point thinning and chip run-up shoulders associated with at least the cutting surfaces of the central edges. An angle γ of the chip run-up shoulder decreases in the region of the point thinning towards the central axis as the distance from the front side increases.

Abstract translation: 钻头具有中心轴线，前侧面，圆周表面，前侧至少两个主边缘，其至少延伸到圆周表面并与其二次边缘合并在一起，至少两个中心边缘从 主边缘远离圆周表面，与主边缘和中心边缘相关联的切割表面，与主边缘和中心边缘相关联的芯片凹槽并被引入圆周表面，至少一个与中心边缘的端部邻接的十字边缘 面向远离穿过中心轴线的主边缘，与中心边缘的至少切割表面相关联的点变薄和芯片起落肩部。 随着距离前侧的距离增加，芯片上升台肩的角度γ在朝向中心轴线变薄的点的区域中减小。

公开(公告)号：US20190224759A1

公开(公告)日：2019-07-25

申请号：US16313967

申请日：2017-07-12

Applicant: Mapal Fabrik für Präzisionswerkzeuge Dr. Kress KG

Inventor： Ulrich KRENZER ,  Serkan TOPAL

IPC: B23B51/00 ,  B23B47/34

Abstract: A step drill includes a distal end, an opposite proximal end, a drill tip and at least one drill step. The drill tip has a tip at the distal end of the step drill and comprises a first number of geometrically defined cutters, each of which is paired with a first flute and lies on an imaginary first circular line about a longitudinal axis of the step drill. The imaginary first circular line has a first radius. The at least one drill step is arranged at a distance from the distal end and has an end face with a second number of geometrically defined cutters each of which is paired with a second flute and lies on an imaginary second circular line that runs about the longitudinal axis of the step drill and has a second radius. The first radius is smaller than the second radius. The first flutes of the drill tip and the second flutes of the drill step merge in a region, which is arranged at a greater distance from the distal end than the end face of the drill step, and form a single flute.