Method and apparatus for machining workpieces having interruptions
AssigneeAir Products and Chemicals, Inc.
InventorsRanajit Ghosh, Zbigniew Zurecki, Lance Michael Grimm
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Abstract
This invention is a method and apparatus for cutting a workpiece which may have interruptions, with a cutting insert having a cutting edge, where the cutting insert is held in a tool holder and is optionally supported by a shim. Coolant, which may contain liquid nitrogen, is introduced through a passageway to a cooling passage located near the cutting edge. The cooling passage may be located either under, behind, or under and behind the cutting edge. Coolant impacts the wall surfaces of the cooling passage near the cutting edge where it is partly evaporated thereby cooling the cutting insert.
Claims11
A method of cutting a workpiece having interruptions, with a cutting insert, said cutting insert having a cutting edge comprising an outside surface, said cutting insert held in a tool holder, said method comprising the steps of:
- contacting said cutting edge of the insert with said workpiece;
- introducing a cryogenic coolant fluid into at least one passage near said cutting edge of the insert to indirectly cool said cutting edge and flowing said coolant fluid through a pressure drop means in said at least one passage;
- evaporating at least a portion of said coolant fluid in said at least one passage;
- and
- exhausting the resultant fluid from the at least one passage in a direction so that said interruptions ahead of the cutting edge are not substantially cooled by the resultant fluid, and said resultant fluid does not contact the outside surface of said cutting edge.
Dependencies are inferred from the claim text.