Cemented carbide insert for turning, milling and drilling

US6221479A · kind A · utility

Assignee

• SANDVIK AB · SE

Inventors

• Mats Waldenstrom · Bromma, SE
• Ake Ostlund · Stuvsta-Snättringe, SE
• Ove Alm · Åtvidaberg, SE

Key dates

• Filing date: Apr 20, 1999
• Grant date: Apr 24, 2001
• Expiry date: Apr 20, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/252
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

There is disclosed a cemented carbide insert with excellent properties for machining of steels and stainless steels. The cemented carbide comprises WC and 4-25 wt-% Co. The WC-grains have an average grain size in the range 0.2-3.5 .mu.m and a narrow grain size distribution in the range 0-4.5 .mu.m. According to the method of the invention a cemented carbide cutting tool insert is made by mixing powders of WC, TiC, TaC and/or NbC, binder metal and pressing agent, drying preferably by spray drying, pressing to inserts and sintering. The method characterised in PA1 that a deagglomerated WC-powder with a narrow grain size distribution is used, PA1 that the powders of TiC, TaC and/or NbC are deagglomerated and PA1 that the mixing is wet mixing with no change in grain size or grain size distribution.