发明申请
US20130017028A1 MULTI-PIECE TWIST DRILL HEAD AND TWIST DRILL INCLUDING THE SAME 有权
多层钻头和双列钻头,包括其中

MULTI-PIECE TWIST DRILL HEAD AND TWIST DRILL INCLUDING THE SAME
摘要:
One non-limiting aspect of the present disclosure is directed to a multi-piece twist drill head. The multi-piece twist drill head includes a core piece formed from a first hard material, and a peripheral piece formed from a second hard material. The core piece and peripheral piece each comprise a cutting edge and are adapted to mate to provide a central region and a peripheral region, respectively, of the multi-piece twist drill head. A twist drill including the multi-piece twist drill head is also disclosed.
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