Claims
- 1. A process for the treatment of a drill bit comprising the steps of:(a) subjecting said drill bit to deep cryogenic treatment; and (b) coating said drill bit with a dry film fluorocarbon lubricant.
- 2. The process as described in claim 1 in which said deep cryogenic treatment comprises the steps of:(a) tempering a drill bit at about 375° F. for about two hours; (b) cooling said drill bit slowly to ambient temperature; (c) cooling said drill bit to approximately −120° F., and soaking said drill bit at about −120° F. until uniformly chilled; (d) cooling said drill bit to about −300° F. and maintaining said drill bit at about −300° F. to about −340° F. for two hours per inch of thickness; (e) warming said drill bit to about −175° F. and soaking said drill bit at about −175° F. until uniform in temperature; (f) warming said drill bit to ambient temperature and soaking said drill bit in still air until said drill bit is at ambient temperature; (g) tempering said drill bit at about 375° F. by soaking said drill bit at about 375° F. for two hours; and (h) cooling said drill bit to ambient temperature.
- 3. The process as described in claim 2 in which coating the drill bit with a dry film fluorocarbon lubricant comprises the steps of:(a) cleaning the drill bit; (b) immersing the drill bit in a bath of the dry film fluorocarbon lubricant; (c) removing the drill bit from the bath; (d) allowing the drill bit to dry at ambient temperature; and (e) baking the drill bit for at least one baking time period at a baking temperature sufficient to bake the dry film fluorocarbon lubricant onto the drill bit.
- 4. The process as described in claim 3 in which said dry film fluorocarbon lubricant is a resin-bonded fluoropolymer coating.
- 5. A process as described in claim 4 in which the baking time period is about one and one-half hours and the baking temperature is about 300° F.
- 6. A process as described in claim 5 in which the dry film fluorocarbon lubricant is Emralon 305™.
- 7. The process as described in claim 6 in which said resin-bonded fluoropolymer coating is Emralon 305™, having the following composition, by volume:Ethanol20%n-Butyl Alcohol20%n-Amyl Acetate5%Methanol5%Phenol5%Proprietary Fluoropolymer5%Carbon Black5%Xylene5%Zinc Chromate5%Methyl Ethyl Ketone20%Isopropanol5%Proprietary Hardener5%
- 8. The process as described in claim 7 which additionally comprises applying a vacuum for removing cuttings and cooling said drill bit.
- 9. A process as described in claim 4 in which the baking time periods comprise:(a) about one-half hour, at a baking temperature of about 450° F.; and (b) about one hour, at a baking temperature of about 300° F.
- 10. A process as described in claim 9 in which the dry film fluorocarbon lubricant is Xylan 1010DF/Red™.
- 11. The process as described in claim 10 which additionally comprises applying a vacuum for removing cuttings and cooling said drill bit.
- 12. A drill bit produced by the process of claim 1.
Parent Case Info
This application claims benefit of Provisional No. 60/159,502 filed Oct. 15, 1999.
US Referenced Citations (8)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1636460 |
Mar 1991 |
RU |
Provisional Applications (1)
|
Number |
Date |
Country |
|
60/159502 |
Oct 1999 |
US |