公开(公告)号：US20030223832A1

公开(公告)日：2003-12-04

申请号：US10446727

申请日：2003-05-29

Applicant: Sandvik AB

Inventor： Stefan Roman ,  Leif Widin

IPC: B23B051/02

CPC classification number: B23B27/145 ,  B23B51/048 ,  B23B2200/125 ,  B23B2200/201 ,  B23B2200/204 ,  Y10S408/713 ,  Y10T407/23 ,  Y10T408/905 ,  Y10T408/906 ,  Y10T408/9097 ,  Y10T408/90993

Abstract: A drilling tool includes a basic body defining a center axis of rotation and having two chip channels and two replaceable indexable cutting bits in the form of a center bit and a periphery bit mounted in respective center and periphery pockets formed in an axially front end of the basic body. The center bit and the center pocket are spaced radially from the periphery bit and the periphery pocket along a first diametrical plane of the basic body. At least the center bit includes four identically-shaped cutting edges, one of which constituting an operative cutting edge intersected by a second diametrical plane oriented perpendicularly to the first diametrical plane. Each cutting edge of the center bit comprises first and second part edges joined by a transition edge portion. The first and second part edges of the operative cutting edge constitutes operative first and second part edges, respectively; the operative first part edge being spaced from the center axis and situated closer than the operative second part edge to an outer periphery of the basic body. An axially forwardmost portion of the operative first part edge is disposed axially forwardly of an axially forwardmost portion of the operative second part edge, and an axially forwardmost portion of an operative cutting edge of the periphery bit lies axially between the axially forwardmost portions of the operative first and second part edges of the center bit, respectively.

Abstract translation: 钻孔工具包括限定中心旋转轴线的基体，并且具有两个芯片通道和中心钻头形式的两个可替换的可转位切割钻头，以及安装在形成在轴向前端的相应中心和周边凹部中的周边钻头 基本身体 中心钻头和中心凹部沿着基体的第一直径平面与周边钻头和周边凹槽径向间隔开。 至少中心钻头包括四个相同形状的切削刃，其中之一构成与第一直径平面垂直定向的第二直径平面相交的操作切削刃。 中心钻头的每个切削刃包括由过渡边缘部分连接的第一和第二部分边缘。 操作切削刃的第一和第二部分边缘分别构成操作的第一和第二部分边缘; 所述操作的第一部分边缘与所述中心轴线间隔开并且比所述操作的第二部分边缘更靠近所述基体的外周。 可操作的第一部分边缘的轴向最前部分沿轴向向前位于可操作的第二部分边缘的轴向最前部，并且周边钻头的有效切割边缘的轴向最前部分轴向位于操作的第二部分边缘的轴向最前部之间 分别是中心位的第一和第二部分边缘。