Rock drilling bit and a method of producing the same

Patent · Tue Sep 19 04:00:00 EDT 1989

OSTI ID:5336463

Kane, R F; Portugal, J J; Kuzniar, P S

This patent describes a method for forming a drill bit of the type used for drilling rock and including a drill bit body defining a cutting face having a plurality of hard material cutting inserts mounted in openings formed in the cutting face. The method comprising the steps of: providing a drill bit body formed from a steel capable of being carburized, the body having a cutting face surface; identifying on the cutting face surface those locations wherein insert mounting openings are needed; covering each location with a material capable of preventing penetration of carbon into the bit body in the area of the location during carburizing, the area covered at each such location being at least slightly greater that the size of the insert mounting opening needed; with the insert mounting locations covered, carburizing and heat treating the bit body to case harden the cutting face to a hardness above 50 on the Rockwell C scale; and thereafter, drilling an insert receiving opening at each location and press-fitting hard material cutting inserts into each such opening.

• Assignee: Sandvik Rock Tools, Inc., Bristol, VA
• Patent Number(s): US 4867015
• Application Number: PPN: US 7197507A
• OSTI ID: 5336463
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
CARBURIZATION
DESIGN
DRILL BITS
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
FABRICATION
HARDENING
HEAT TREATMENTS
NATURAL GAS WELLS
OIL WELLS
ROCK DRILLING
SURFACE HARDENING
SURFACE TREATMENTS
WELLS