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:
Mar. 27, 2007
Filed:
Sep. 05, 2003
Viktor P. Astakhov, Rochester Hills, MI (US);
Yefim Val, Troy, MI (US);
Gregory Link, Canton, MI (US);
Viktor P. Astakhov, Rochester Hills, MI (US);
Yefim Val, Troy, MI (US);
Gregory Link, Canton, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
A method of forming deep holes and a gundrill therefore is disclosed. The gundrill has an elongate tubular shank and a cutting tip, each provided with a tubular central region supplying pressurized drilling fluid and a non-circular fluid cross-section defining a drilling fluid return path in conjunction with the hole being formed. The cutting tip flute defines a primary rake surface terminating in an offset point, and a secondary flank surface for forming an outlet with the hole being drilled, sized to maintain fluid pressure in the bottom end space to cool the cutting surfaces and to effectively remove chips as they are formed. A localized relief passage, sized relative to the outlet passage to cause a significant amount of drilling fluid to flow therethrough, is formed behind a peripheral rake edge of the primary rake surface for drilling fluid to exit the end space and cool the tip.