The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 08, 2020
Filed:
Nov. 17, 2017
Epiroc Drilling Tools Aktiebolag, Fagersta, SE;
Tomas Rostvall, Stockholm, SE;
Niklas Ahlén, Söderbärke, SE;
EPIROC DRILLING TOOLS AKTIEBOLAG, Fagersta, SE;
Abstract
Drill bit insert with a sintered cemented carbide body including a hard phase of tungsten carbide (WC) and a binder phase wherein the cemented carbide comprises 5.0-7.0 wt % Co, 0.10-0.35 wt % Cr, and a Cr/Co weight ratio of 0.015-0.058. The cemented carbide body has a hardness of 1520-1660 Hv30 and a toughness of K1≥10.0 both measured in the bulk at the center of the longitudinal axis through the center of the insert, or ≥5 mm from any surface of the insert. The insert further has a surface toughness K1≥12.0 measured at 0.5 mm below the surface of the body in a transverse direction to the longitudinal axis the insert. The invention also relates to a drill bit comprising the insert and the use of such a drill bit for drilling.