Abstract:

Both high drilling efficiency and long life are generally difficult for general diamond bit. Based on ecdysis principle in terms of bionics, a reproducible nozzle is designed, and which is used to add the height of work layer of a diamond bit to improve its life. In the matter of processing technology of the reproducible nozzle, cold pressing technology is used to make the powder including diamond molding firstly, and then the powder compacts are put into the mould, and in the end, hot pressing sintering method are used to manufacture diamond bit. In addition, the Φ59 bit including reproducible nozzles was manufactured, and it was experimented in the laboratory simulating field conditions. And the result indicates that the method of adding the bit's life through a kind of reproducible nozzle is feasible, if some specific materials are selected as the materials of nozzle, so it provides a new thought for development of long-life diamond bit for core drilling.

Key words: ecdysis principle, nozzle, cold-pressing technology, processing technology, diamond bit