公开(公告)号：US20030230433A1

公开(公告)日：2003-12-18

申请号：US10439182

申请日：2003-05-16

Applicant: SANDVIK AB

Inventor： Ann-Cathrin Hedlund ,  Goran Hagelin ,  Agne Lundquist

IPC: E21B017/00

CPC classification number: C21D1/10 ,  C21D9/22 ,  Y02P10/253

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.

Abstract translation: 用于冲击式岩石钻孔的螺纹钻石元件包括形成中心轴线并具有硬化螺纹的主体。 螺纹包括螺纹牙顶和螺纹底部以及具有增加的硬度的硬化区域。 硬化区域包括分别从螺纹的顶部和底部（谷）径向延伸到硬化区域的边界曲线的第一和第二硬化区域。 边界曲线具有沿着螺纹牙顶延伸的凸部，以及沿螺纹底部延伸的凹部。