US 12,240,044 B2
Turning insert for metal cutting
Adam Johansson, Sandviken (SE); Ronnie Lof, Sandviken (SE); and Joe Truong, Sandviken (SE)
Assigned to AB Sandvik Coromant, Sandviken (SE)
Appl. No. 17/433,778
Filed by AB SANDVIK COROMANT, Sandviken (SE)
PCT Filed Feb. 3, 2020, PCT No. PCT/EP2020/052555
§ 371(c)(1), (2) Date Aug. 25, 2021,
PCT Pub. No. WO2020/173663, PCT Pub. Date Sep. 3, 2020.
Claims priority of application No. 19159960 (EP), filed on Feb. 28, 2019.
Prior Publication US 2022/0347760 A1, Nov. 3, 2022
Int. Cl. B23B 27/16 (2006.01); B23B 27/14 (2006.01)
CPC B23B 27/145 (2013.01) [B23B 2200/081 (2013.01); B23B 2200/201 (2013.01); B23B 2200/321 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A turning insert comprising:
a top surface;
an opposite bottom surface;
side surfaces connecting the top surface and the bottom surface;
a reference plane located parallel to and between the top surface and the bottom surface;
a center axis extending perpendicular to the reference plane and intersecting the reference plane;
three nose portions formed symmetrically around the center axis, each nose portion including a first cutting edge, a second cutting edge and a convex nose cutting edge connecting the first and second cutting edges, wherein in a top view the first and second cutting edges on the same nose portion form a nose angle of 25-50° relative to each other, wherein the first cutting edge includes a first sub-portion and a second sub-portion, wherein a distance from the nose cutting edge to the first sub-portion is shorter than a distance from the nose cutting edge to the second sub-portion, wherein a distance from the first sub-portion to the reference plane decreases at an increasing distance from the nose cutting edge, wherein, as seen in a side view, the first sub-portion slopes at an angle of 1-5°, wherein a distance from the second sub-portion to the reference plane increases at the increasing distance from the nose cutting edge, wherein, as seen in a side view, the second sub-portion slopes at an angle of 1-5°, and the bottom surface including rotation prevention means; and
bisectors extending equidistantly from each pair of first and second cutting edges and wherein each bisector intersects the center axis, wherein the first and second cutting edges are symmetrical or substantially symmetrical relative to a respective bisector in respective side views.