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US 4,175,896 AGranted
Ball endmill
AssigneesToshiba Tungaloy Co., Ltd., Makino Milling Machine Co., Ltd.
InventorsTateshi Kishinami, Makoto Sato
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AssigneesToshiba Tungaloy Co., Ltd., Makino Milling Machine Co., Ltd.
InventorsTateshi Kishinami, Makoto Sato
Estimating the term…
A ball endmill comprises a cylindrical body and a cutting element secured to one end of the cylindrical body. The face of the cutting element is convexed and forms a part of the surface of an imaginary cone, the axis of which is inclined to the axis of the cylindrical body. The cutting element is constituted by one or more parts and has at least one arcuate cutting edge. The cutting edge has its starting point located near the axis of the cylindrical edge and cuts in a workpiece a spherical concave as the cylindrical body is rotated. To cut a deep hole with a spherically curved bottom, the ball endmill may be provided with an auxiliary cutting element. The auxiliary cutting element is secured to the periphery of the cylindrical body and has a straight cutting edge extending parallel to the axis of the cylindrical body. The straight cutting edge cuts a straight cylindrical hole in a workpiece as the cylindrical body is rotated.
A ball endmill comprising a cylindrical body and a cutting element provided with one end of the cylindrical body and having a face and at least one arcuate cutting edge, said face being convexed and forming a part of the surface of an imaginary cone whose axis is inclined to the axis of the cylindrical body, and said arcuate cutting edge having a starting point located near the axis of the cylindrical body so as to cut a part or all of a spherical concave in a workpiece as the cylindrical body is rotated.
A ball endmill comprising a cylindrical body, a main cutter secured to one end of the cylindrical body and having a face and at least one arcuate cutting edge, and an auxiliary cutter secured to the periphery of the cylindrical body and having a straight cutting edge, said face being convexed and forming a part of the surface of an imaginary cone whose axis is inclined to the axis of the cylindrical body, said arcuate cutting edge having a starting point located near the axis of the cylindrical body so as to cut a part or all of a spherical concave in a workpiece as the cylindrical body is rotate, and said straight cutting edge cuts a straight cylindrical hole in the workpiece as the cylindrical body is rotated.
Dependencies are inferred from the claim text.