MACHINING DEVICE, MACHINING METHOD AND CUTTING TOOL
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United States of America Patent
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Issued Date -
Feb 16, 2023
app pub date -
Nov 30, 2020
filing date -
Nov 30, 2020
priority date (Note) -
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status (Latency Note)
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Abstract
A machining device threads a workpiece by relatively rotating the workpiece and a multi-blade tool and relatively moving them along a feed direction to perform cutting processes in the radial direction of the workpiece along the same cutting path in a predetermined spiral form. A controller performs a groove machining to form a threaded portion with vibration in the radial direction of the workpiece and a finish machining to form the threaded portion by bringing the multi-blade tool into contact with the grooved portion of the workpiece. The multi-blade tool has a first cutting blade and a second cutting blade arranged side by side along the feed direction. The controller sets amplitude of a vibration waveform to a value at which a cutting edge of the second cutting blade does not come into contact with the screw bottom surface of the workpiece in the finish machining.
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