Rotary helical milling cutter with replaceable cutter bit elements

US4219292A · kind A · utility

Assignee

• Montanwerke Walter GmbH · DE

Inventors

• Friedrich Hoffmann
• Werner Grafe · Reutlingen, DE
• Siegfried Deiss · Gomaringen, DE
• Willy Schlotterer · Nehren, DE

Key dates

• Filing date: Mar 7, 1979
• Grant date: Aug 26, 1980
• Expiry date: Mar 7, 1999

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T407/1966
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

To permit resharpening of cutter blades of a helical milling cutter, the cutter blades or bits of a multi-bit cutter have decreasing thickness, and are placed in grooves having the same helix radius, but the centers of the helical axes offset from the center of rotation of the cylindrical cutter body in the direction towards the associated groove, so that cutter blades of lesser thickness are still seated firmly in the bottom of the respective groove. Upon dulling of the cutters, the thinnest one of the cutter blades is discarded, the thickest one only replaced and the worn blades moved up one step along the circumference of the body into grooves which are progressively more shallow, to compensate for decrease in thickness of the respective cutter bits upon regrinding to resharpen the bits.