Cutting tool, particularly a boring bar, as well as a process for machining a number of bores

US9789547B2 · kind B2 · utility

Assignee

• KENNAMETAL INC. · US

Inventors

• Michael Hacker · Sinsheim, DE
• Sebastian Kunschir · Winklarn, DE

Key dates

• Filing date: Jun 3, 2014
• Grant date: Oct 17, 2017
• Expiry date: Jun 3, 2034

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T408/76
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

To make it possible for bores (16) that are in line with one another to be efficiently worked by means of a boring bar (2), the boring bar has a main body (10) with an axis of rotation (R) and a number of cutting elements (12, 12A) at intervals from one another in the axial direction (4) and also guiding elements (14) for guiding the main body (10) in a guiding bore (16A). The guiding elements (14) are kept at a distance from the axis of rotation (R) equivalent to a guide radius (r1). The main body (10) is divided into a functional region (19) and an eccentric region (10), wherein the cutting elements (12, 12A) and the guiding elements (14) are arranged such that they are distributed around the main body (10) over an angular range (a) of less than 180°. Furthermore, the circumferential side (22) of the main body (10) can be passed eccentrically through a respective bore (16, 16A) of which the unworked tube radius (r2) is less than the guide radius (r1).