| 摘要 |
This disclosure sets out a method of forming a protective layer on the surface of the material of drill bits to increase the number of hits when drilling very small holes such as those drilled in printed circuit board (PCB's). The process involves forming a phosphorous based solution which is used as a dip to treat the drill bits, and then it is heated to drive off the solvent which is primarily water, oil, or glycol. This leaves a protective layer featuring phosphorous based materials on the surface of drill bit. This works for tool steel drill bits and also for those made with a cobalt alloy holding together tungsten carbide particles. The method preferably includes applying a treatment fluid in lieu of cutting oil during the fabrication of the cutting tool, the fluid including a compound containing phosphorus and nitrogen/hydrogen groups.
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