Claims
- 1. A bonding tool comprising:
- a shank;
- a tool end part secured to said shank and having an end pressing surface, said end pressing surface being composed of a material selected from the group consisting of polycrystalline diamond, single crystal diamond, sintered diamond compacts and cubic boron nitride; and
- wherein said end pressing surface is concave, so as to gradually curve from a peripheral portion to a central portion thereof, at an application temperature of said bonding tool, and has a degree of flatness of 1 to 5 .mu.m at said application temperature.
- 2. A bonding tool as recited in claim 1, wherein
- said application temperature is in a range of 200.degree. to 650.degree. C.
- 3. A bonding tool as recited in claim 2, wherein
- said shank is formed of a material selected from the group consisting of molybdenum, tungsten, tungsten-nickel alloys, Kovar alloy, Inconel alloy, Invar alloy, stainless steels and cemented carbides.
- 4. A bonding tool as recited in claim 1, wherein
- said shank is formed of a material selected from the group consisting of molybdenum, tungsten, tungsten-nickel alloys, Kovar alloy, Inconel alloy, Invar alloy, stainless steels and cemented carbides.
- 5. A process for production of a bonding tool having a shank, a tool end part secured to said shank and having an end pressing surface composed of a material selected from the group consisting of polycrystalline diamond, single crystal diamond, sintered diamond compacts and cubic boron nitride, said process comprising:
- polishing or grinding said end pressing surface of said tool end part while controlling heating thereof to a predetermined temperature lower than an application temperature of said bonding tool, in such a manner that said end pressing surface becomes concave at said application temperature.
- 6. A process as recited in claim 5, wherein
- said application temperature is in a range of 200.degree. to 650.degree. C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
4-197837 |
Jul 1992 |
JPX |
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Parent Case Info
This is a divisional application of Ser. No. 08/082,838, filed Jun. 28, 1993, now U.S. Pat. No. 5,373,731.
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Number |
Name |
Date |
Kind |
2460312 |
Scherer |
Feb 1949 |
|
5197651 |
Nakamura et al. |
Mar 1993 |
|
5213248 |
Horton et al. |
May 1993 |
|
Foreign Referenced Citations (3)
Number |
Date |
Country |
198360 |
Aug 1991 |
JPX |
209702 |
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CHX |
626090 |
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GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
82838 |
Jun 1993 |
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