The strong pulse current processing can be used to change the microstructure and properties of conductive metals and alloys. At present, this method is the most promising enhancement method because it does not require complicated and expensive equipment, and is simple to implement, and the energy consumption is one to two orders of magnitude lower than that of heat treatment. This method can heal tissue defects inside the cutting tool material. Tests have shown that the high-speed steel drill bit can be improved by 5 times durability.
This method of treating the drill bit has the following advantages over the wear-resistant coating and the titanium cyanide-based coating method: no need for auxiliary material consumption when processing with a strong pulse current, no complicated processing, and the processing time is only a few seconds.
A comprehensive process can increase the durability of the drill bit by 14 times. The method is as follows: the drill bit is first treated with a strong pulse current, and then the wear resistant coating is applied by spraying. In this way, the load is first loaded by the coating during operation, and when it is worn, the bit body treated by the strong pulse current is subjected to a load.
Tests have shown that in the case of strong pulse current processing, in addition to the unit energy value of one pulse, the most influential is the number of pulses, that is, multi-cycle strong pulse current processing.
Li Fuliang, [J], China Surface Engineering: 1999, Issue 04
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