Carbide Rotary Tool Cutting Edge Portion Intermediate Form

A carbide rotary tool cutting edge portion intermediate form that is an intermediate form of the cutting edge portion, the cutting edge portion intermediate form having a recessed portion that defines a bottom face and an inner circumferential surface.

Tthe cutting edge portion intermediate form being made from cemented carbide that has been pre-sintered at a second temperature that is lower than the first temperature; inserting the front end of the support portion intermediate form into the recessed portion provided in the cutting edge portion intermediate form; and sintering the cutting edge portion intermediate form and the support portion intermediate form together in a state of double face contact in which the end face of the front end of the support portion intermediate form is in direct contact with the bottom face of the recessed portion and the outer circumferential surface of the front end of the support portion intermediate form is in direct contact with the inner circumferential surface of the recessed portion.


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