Roller cutter drill bit and method of forming
Patent
·
OSTI ID:7181117
This patent describes a method of mounting cutting inserts within sockets of a metal roller cutter body of a rotary drill bit. It comprises: forming a cutter body of a metal material having a minimum yield strength of at least 160,000 psi after final assembly in the rotary drill bit; forming sockets in the cutter body; heating the roller cutter body with the socket formed therein to a predetermined temperature of at least around 500{degree}F. In a controlled environment in a heat chamber; placing cutting inserts in a slip fit essentially by gravity within the sockets when the cutter body is heated to the predetermined temperature in the controlled environment with the inserts and sockets being sized to provide a clearance between the inserts and sockets when the inserts are initially positioned with the sockets; and cooling the cutter body to a predetermined low temperature within a controlled environment to provide an interference shrink fit between the sockets and the inserts of at least 0.001 inch for each inch of diameter of the inserts.inserts.
- Assignee:
- Reed Tool Co., Houston, TX
- Patent Number(s):
- US 4887493; A
- Application Number:
- PPN: US 7-218642A
- OSTI ID:
- 7181117
- Country of Publication:
- United States
- Language:
- English
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