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US 2019/0160558 A1Published application
Single-sided three-way indexable milling insert having high void volume to material volume ratio and insert mill therefor
AssigneeIscar, Ltd.
InventorsGIL HECHT, Adi SHAPIR
Life of this patent
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Abstract
A single-sided three-way indexable milling insert for feed milling operations, includes a positive basic shape, a rake surface, a peripheral surface including side abutment surfaces, a base bearing surface and a screw hole connecting the rake and base bearing surfaces. The insert has a cutting edge including exactly three main cutting sub-edges and three secondary cutting sub-edges. A material volume VF of the cutting insert and a void volume VS of the insert fulfill the condition VS/VF≥0.30.
Claims24
A single-sided three-way indexable cutting insert having a positive basic shape and comprising:
- a material volume (VF) defined by the amount of material of the cutting insert;
- a rake surface;
- a base bearing surface located opposite the rake surface;
- an insert axis (AI) extending perpendicular to the base bearing surface and through a center of the insert, the insert axis defining:
- an upward direction from the base bearing surface towards the rake surface, a downward direction opposite to the upward direction, and an outward direction perpendicular to the upward and downward directions and extending away from the insert axis;
- a cutting insert height (HI) measurable parallel to the insert axis, from the base bearing surface to a highest point of the rake surface;
- a peripheral surface connecting the rake surface and base bearing surface;
- a cutting edge formed along an intersection of the peripheral surface and the rake surface, the cutting edge defining, in a view parallel to the insert axis (AI), an imaginary edge circumscribed circle (CE) having an edge circumscribed diameter (DE);
- and
- a screw hole opening out to the rake and base bearing surfaces, the screw hole comprising:
- a screw hole bottom at an intersection with the base bearing surface;
- a screw hole top at an intersection with the rake surface;
- a void volume (VS) calculated as the volume of a void extending from the screw hole bottom to the screw hole top;
- and
- a hole circle (CS) defined, in a view parallel to the insert axis AI), at an intersection of the rake surface and the screw hole, the hole circle (CS) having a hole diameter (DS);
- the base bearing surface defining, in a bottom view parallel to the insert axis (AI), an imaginary base circumscribed circle (CB) having a base diameter (DB);
- the peripheral surface comprising first, second, third, fourth, fifth and sixth side abutment surfaces;
- the cutting edge, in a top view parallel to the insert axis (AI), defining an edge inscribed circle (CM) having an edge inscribed diameter (DM), the cutting edge comprising:
- exactly three main sub-edges and exactly three secondary sub-edges, the main sub-edges alternating with the secondary sub-edges with a corner sub-edge at each intersection between the main and secondary sub-edges;
- wherein:
- the base circumscribed diameter (DB) is smaller than the edge circumscribed diameter (DE);
- and
- a volume ratio of the void volume (VS) to the material volume (VF) fulfills the condition:
- VS/VF≥0.30.
21 more elements
A tool holder comprising:
- a rear end;
- a front end;
- a tool periphery extending from the rear end to the front end;
- a rotation axis extending through a center of the tool holder, the rotation axis defining a forward direction extending from the rear end to the front end, a rearward direction opposite to the forward direction, an outward direction perpendicular to the rotation axis and directed from the rotation axis to the tool periphery, and an inward direction opposite to the outward direction;
- a shank portion extending forward of the rear end;
- and
- a cutting portion extending forward of the shank portion to the front end, the cutting portion having a tool diameter (DT) at the front end and exactly two circumferentially spaced flutes extending rearwardly from at an intersection of the front end and the tool periphery;
- each of the flutes comprising a pocket formed at the intersection of the front end and the tool periphery;
- each of the two pockets comprising:
- a seat abutment surface;
- a threaded pocket hole opening out to the seat abutment surface;
- and
- first, second and third lateral abutment surfaces which are transverse to the seat abutment surface;
- wherein:
- each first lateral abutment surface is located adjacent to the tool periphery and extends in the outward and forward directions;
- each second lateral abutment surface is closer to the rotation axis than the first lateral abutment surface and is separated from the first lateral abutment surface by a first relief recess, each second lateral abutment surface extending in the inward and forward directions;
- each third lateral abutment surface is closer to the rotation axis and more forwardly located than the second lateral abutment surface, and is separated from the second lateral abutment surface by a second relief recess, each third lateral abutment surface extending in the inward and forward directions;
- and
- the tool diameter (DT) fulfilling the condition DT<11 mm.
16 more elements
Dependencies are inferred from the claim text.