Patent ID: 9132489
Filing Date: 2015-09-15
Classification: B23B,B23C,Y10T

Abstract:
1. A method of machining a workpiece using a rotary milling cutter comprising: a shaft having a central, rotational axis; a tool head having a central, rotational axis being disposed coaxially to said central, rotational axis of said shaft; said shaft being connected to said tool head to drive and rotate said tool head; said tool head comprising an end face disposed opposite said shaft; said tool head comprising a peripheral side surface being disposed about the periphery of and to extend axially away from said end face toward said shaft; a plurality of indexable inserts mounted on the peripheral side surface of said tool head; each of said indexable inserts comprising a first partial body and a second partial body, each partial body having a general shape of a truncated pyramid with a polygonal base and a top surface; said first partial body comprising a plurality of roughing edges for rough machining of a workpiece; said second partial body comprising a plurality of finishing edges for finish or smooth machining of a workpiece; said first and second partial bodies joined together at the top surface of their respective truncated pyramids and rotated relative to one another about a central axis of the indexable insert in such a way that one of the plurality of finishing edges of the second partial body is located axially farther from the end face of the tool head in a direction extending parallel to the central, rotation axis of the tool head and toward the workpiece when positioned for machining than one of the plurality of roughing edges of the first partial body when positioned for machining; each of said indexable inserts being positioned on said peripheral side surface in such a way that said polygonal base of said first partial body faces away from said tool head and said polygonal base of said second partial body faces toward said tool head to enable one of the plurality of roughing edges of said first partial body and one of the plurality of finishing edges of said second partial body to engage the workpiece; said method comprising the steps of: rotating said tool head with said shaft; rough cutting said workpiece with one of the plurality of roughing edges of said first partial body to remove a first amount of material from said workpiece; and finish cutting a rough-cut surface of the workpiece with one of the plurality of finishing edges of said second partial body to remove a second amount of material from said workpiece, said second amount of material being smaller than the first amount of material removed by said rough cutting step, whereby both one of the plurality of roughing edges of said first partial body and one of the plurality of finishing edges of said second partial body simultaneously engage said workpiece to perform both said rough cutting step and said finish cutting step of said workpiece in a single cutting operation.