INDEXABLE ROTARY CUTTING TOOL AND TOOL BODY
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United States of America Patent
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Issued Date -
Jul 13, 2017
app pub date -
Dec 24, 2014
filing date -
Dec 25, 2013
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Abstract
An indexable roughing end mill having a peripheral surface provided with a plurality of spiral grooves. When the positions of cutting inserts (40) arranged in each spiral groove (28) are defined as a first segment to an nth segment from a leading end surface (22) side of a tool body (20) toward a base end surface (21) side, all of the angles β1 . . . βm between lines connecting a rotational axis (O) and the cutting inserts (40) in the first segments of the respective spiral grooves (28) are different from each other, as viewed from the leading end, and an angle (αt) between the cutting insert (40) in the first segment and the cutting insert (40) in the uppermost nth segment in a spiral groove 28 is different from any of the angles β1 . . . βm between the lines, as viewed from the leading end.
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