Coated milling insert and method of making it

US6177178A · kind A · utility

Assignee

• SANDVIK AB · SE

Inventors

• Ake Ostlund · Stuvsta-Snättringe, SE
• Jeanette Persson · Nacka, SE
• Bjorn Ljungberg · Stuvsta-Snättringe, SE

Key dates

• Filing date: Sep 1, 1998
• Grant date: Jan 23, 2001
• Expiry date: Sep 1, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/265
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A coated milling insert particularly useful for milling in low and medium alloyed steels with or without raw surface zones during wet or dry conditions. The insert is characterized by a WC-Co cemented carbide with a low content of cubic carbides and a highly W alloyed binder phase and a coating including an inner layer of TiC.sub.x N.sub.y O.sub.z with columnar grains, a layer of .kappa.-Al.sub.2 O.sub.3 and, preferably, a top layer of TiN. The layers are deposited by using CVD methods.