Milling cutter, particularly for copying, and cutting insert therefor

US5951213A · kind A · utility

Assignee

• WALTER AG · DE

Inventors

• Lothar Fauser · Nehren, DE
• Hans Peter Durr · Mössingen, DE
• Wolfgang Votsch · Rangendingen, DE
• Siegfried Bohnet · Mössingen, DE

Key dates

• Filing date: Jun 16, 1997
• Grant date: Sep 14, 1999
• Expiry date: Jun 16, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T407/23
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

To facilitate manufacture and stocking of inserts for the ball end of a ball milling cutter, identical asymmetrical cutting inserts which are of generally pointed, elongated leaf shape, define two end points or tips, with two cutting edges opposite a theoretical straight line connecting the tips. The cutting edges (14, 15) each have at least one curved portion (24, 26) and an adjoining elongated, roughly straight portion (23, 25). The lengths of the respective curved portions and straight portions on the two cutting edges are different, and the edges and their respective lengths and positions with respect to an attachment hole (17) are so arranged that the first cutting edge of one insert on one side cuts on a ball surface which extends at least up to approximately the center line of the milling tool, and the straight cutting edge merges into a cylindrical surface. The curved portion (26) of the other cutting edge (15) of a second, identical insert completes the ball cutting surface and also merges into a cylindrical surface, so that, in operation, one longer and one shorter curved portion, respectively, on both inserts are actively cutting. When the cutting edges are worn, the ins…