Rock drill product and method

US6978852B2 · kind B2 · utility

Assignee

• SANDVIK AB · SE

Inventors

• Ann-Cathrin Hedlund · Sandviken, SE
• Göran Hagelin · Sandviken, SE
• Agne Lundquist · Bro, SE

Key dates

• Filing date: May 16, 2003
• Grant date: Dec 27, 2005
• Expiry date: Jul 18, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/25
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A threaded rock drill element for percussive rock drilling includes a body forming a center axis and having a hardened thread. The thread includes thread crests and thread bottoms and a hardened zone having increased hardness. The hardened zone includes first and second hardened areas extending radially from a crest and bottom (valley), respectively, of the thread, to a boundary curve of the hardened zone. The boundary curve has convex portions extending along the thread crests, and concave portions extending along the thread bottoms.