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公开(公告)号：EP4046732A1
公开(公告)日：2022-08-24
申请号：EP19949173.9
申请日：2019-10-15
发明人： JINDAI, Masaaki , TSUTSUMI, Yuki
IPC分类号： B23B51/00
摘要： The drill is rotatable about a central axis. The drill includes a central axis, a front end and a rear end opposite to each other in a direction along the central axis, an outer peripheral surface, a cutting edge formed at the front end and extending from the outer peripheral surface toward the central axis, a flank face contiguous with the cutting edge, a flute formed on the outer peripheral surface and extending spirally around the central axis from the front end toward the rear end, and a thinning rake face contiguous with the flute. The cutting edge has a main cutting edge extending from the outer peripheral surface and a thinning cutting edge contiguous with an end of the main cutting edge away from the outer peripheral surface. The flute includes a main rake face contiguous with the main cutting edge from the opposite side of the flank face. The thinning rake face is contiguous with the thinning cutting edge from the opposite side of the flank face. The thinning rake face is flush with the main rake face. The angle formed by the main rake face and the central axis is not less than -18° and not more than 7°. The width of the main rake face is not less than 0.07 mm and not more than 1.5 mm.
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公开(公告)号：EP3492205A1
公开(公告)日：2019-06-05
申请号：EP18837338.5
申请日：2018-07-06
IPC分类号： B23B51/00
摘要： A drill includes a rake face, a negative land, a flank face, and an outer circumferential surface. The negative land is continuous to the rake face. The flank face is continuous to the negative land. The outer circumferential surface is continuous to the rake face, the negative land, and the flank face. A ridgeline between the rake face and the negative land constitutes a lower cutting edge. A ridgeline between the flank face and the negative land constitutes an upper cutting edge. When viewed in a direction along a rotation axis of the drill, the negative land includes: a first region in which a space between the upper cutting edge and the lower cutting edge becomes wider toward the outer circumferential surface; and a second region which is continuous to the first region and in which the space becomes wider toward the rotation axis. In a cross section perpendicular to the rotation axis, the rake face includes a return face continuous to the outer circumferential surface, the return face being recessed opposite to a rotation direction of the drill. When a first boundary represents a boundary between the outer circumferential surface and the first region and a second boundary represents a boundary between the first region and the second region, a length of the first boundary is larger than a length of the second boundary in a direction parallel to the rotation axis. The second boundary is continuous to the return face.
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公开(公告)号：EP4329970A1
公开(公告)日：2024-03-06
申请号：EP21727604.7
申请日：2021-04-27
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公开(公告)号：EP3459663A1
公开(公告)日：2019-03-27
申请号：EP17799099.1
申请日：2017-04-19
发明人： NAKATA, Shinya , TSUTSUMI, Yuki
摘要： A cutting tool has a rake face and a flank face. The flank face is provided with a coolant supply hole. A ridgeline between the rake face and the flank face forms a cutting edge. An outer shape of the coolant supply hole in a cross section orthogonal to an axis includes a first portion facing the cutting edge, and a second portion opposite to the cutting edge when viewed from the first portion. The first portion has a concave portion extending toward the second portion. The concave portion is defined by a first side portion and a second side portion facing each other, and a bottom continuous with both the first side portion and the second side portion. In the cross section, an angle formed by a tangent of the first side portion and a tangent of the second side portion is not more than 160°.
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