التفاصيل البيبلوغرافية
| العنوان: |
Method and apparatus for retaining polycrystalline diamond cutters in a drill bit body of matrix or steel |
| Document Number: |
20090038442 |
| تاريخ النشر: |
February 12, 2009 |
| Appl. No: |
12/221836 |
| Application Filed: |
August 07, 2008 |
| مستخلص: |
As a more friendly, environmentally sounder replacement process for retaining PDC cutters in drill bits, compared to the known high temperature metallic brazing processes, a process is described for using a low temperature resin which cures in the range of 350° F. to 450° F., while having a melting point below 1250° F., to prevent degradation to the PDC cutters usually occurring at 1250° F. in the drill bit repair cycle. |
| Inventors: |
Shamburger, James (Spring, TX, US); Jacobson, Bruce (Spring, TX, US) |
| Claim: |
1. A method for retaining a PDC cutter in a drill bit body, comprising the steps of: at least partially coating the interior surfaces of cutter pocket formed in a drill bit body, with a resin-based glue having a melting point below 1250° F. once the glue has been cured; at least partially coating the exterior surfaces of the PDC cutter with said glue; placing said PDC cutter in said pocket; curing said glue to thereby retain said PDC cutter in said pocket. |
| Claim: |
2. A method for retaining and removing a PDC cutter in a drill bit body, comprising the steps of: at least partially coating the interior surfaces of a cutter pocket formed in a drill bit body, with a resin-based glue having a melting point below 1250° F. once the glue has been cured; at least partially coating the exterior surfaces of the PDC cutter with said glue; placing said PDC cutter in said pocket; curing said glue to thereby retain said PDC cutter in said pocket; heating said glue at the melting point of said glue; and removing said PDC cutter from the said pocket. |
| Claim: |
3. The method according to claim 2, comprising the additional steps of: replacing the said PDC cutter in said pocket but at in a position rotated from the position in the pocket as said cutter was originally place in said pcket. |
| Claim: |
4. The method according to claim 1, wherein the melting point of said glue is 1150° F. for less. |
| Claim: |
5. A method for retaining a plurality of PDC cutters in a drill bit body, comprising the steps of: at least partially coating the interior surfaces of a plurality of cutter pockets formed in a drill bit body, with a resin-based glue having a melting point below 1250° F. once the glue has been cured; at least partially coating the exterior surfaces of said PDC cutters with said glue; placing said PDC cutters in said sockets, respectively; and curing said glue to thereby retain said PDC cutters in said pockets, respectively. |
| Claim: |
6. The method according to claim 5, wherein the melting point of said glue is 1150° F. or less. |
| Claim: |
7. A method for retaining and removing a plurality PDC cutters in a drill bit body, comprising the steps of: at least partially coating the interior surfaces of a plurality of cutter pockets formed in a drill bit body, with a resin-based glue, and a melting point below 1250° F. once the glue has been cured; at least partially coating the exterior surfaces of a plurality of PDC cutters with said glue; placing said plurality of PDC cutters in said pocket, respectively; curing said glue to thereby retain said PDC cutters in said pockets; heating said glue to the melting point of said glue; and removing at least one of said PDC cutters from at least one of said pockets, respectively. |
| Claim: |
8. The method according to claim 7, comprising the additional steps of: replacing said at least PDC cutter in said at least one pocket but in a position rotated from the position in the pocket as said at least one cutter was originally placed in said at least one pocket. |
| Claim: |
9. A method for retaining a PDC cutter in a drill bit body, comprising the steps of: at least partially coating the interior surfaces of cutter pocket formed in a drill bit body, with a resin-based glue having a melting point below 1250° F. once the glue has been cured; at least partially coating the exterior surfaces of the PDC cutter with said glue; placing said PDC cutter in said pocket; heating said glue to one or more temperatures in the range of 300° F. to 450° F. to thereby retain said PDC cutter in said pocket. |
| Claim: |
10. A method for retaining a PDC cutter in a drill bit body, comprising the steps of: at least partially coating the interior surfaces of a cutter pocket formed in a drill bit body, with a resin-based glue having a glue strenght of at least 3000 psi and a melting point below 1250° F. once the glue has been cured; at least partially coating the exterior surfaces of the PDC cutter with said glue; placing said PDC cutter in said pocket; and curing said glue to thereby retain said PDC cutter in said pocket. |
| Claim: |
11. A method for retaining and removing a plurality PDC cutters in a drill bit body, comprising the steps of: at least partially coating the interior surfaces of a plurality of cutter pockets formed in a drill bit body, with a resin-based glue, and a melting point below 1250° F. once the glue has been cured; at least partially coating the exterior surfaces of a plurality of PDC cutters with said glue; placing said plurality of PDC cutters in said pocket, respectively; curing said glue to thereby retain said PDC cutters in said pockets; heating said glue to the melting point of said glue; and removing at least one of said PDC cutters from at least one of said pockets, respectively; and placing said at least PDC cutter in at least one of said pockets but in a position rotated from the position in the pocket as said at least one cutter was originally placed in said at least one pocket. |
| Current U.S. Class: |
761/082 |
| Current International Class: |
21 |
| رقم الانضمام: |
edspap.20090038442 |
| قاعدة البيانات: |
USPTO Patent Applications |