US 11,654,495 B2
Cutting insert for a shoulder milling tool
Thomas Eriksson, Falun (SE); Jorgen Jansson Udd, Gavle (SE); and Stefan Roman, Valbo (SE)
Assigned to AB SANDVIK COROMANT, Sandviken (SE)
Appl. No. 16/982,625
Filed by AB SANDVIK COROMANT, Sandviken (SE)
PCT Filed Dec. 10, 2018, PCT No. PCT/EP2018/084145
§ 371(c)(1), (2) Date Sep. 21, 2020,
PCT Pub. No. WO2019/179647, PCT Pub. Date Sep. 26, 2019.
Claims priority of application No. 18163292 (EP), filed on Mar. 22, 2018.
Prior Publication US 2021/0023634 A1, Jan. 28, 2021
Int. Cl. B23C 5/20 (2006.01)
CPC B23C 5/205 (2013.01) [B23C 2200/208 (2013.01); B23C 2200/326 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A cutting insert for a shoulder milling tool, the cutting insert having a trigonal basic shape, the cutting insert comprising:
an upper side defining an upper extension plane;
a lower side opposite the upper side, the lower side defining a lower extension plane, wherein a center axis extends perpendicularly through the upper and lower extension planes;
a peripheral side surface extending between the upper side and the lower side;
a plurality of indexable cutting edges formed in a transition between the upper side and the peripheral side surface, each indexable cutting edge, as seen in a top view, extending along a corner of the cutting insert, wherein each indexable cutting edge includes a main cutting edge, a corner cutting edge, and a surface-wiping secondary cutting edge, wherein the main cutting edge adjoins the corner cutting edge, and the corner cutting edge adjoins the surface-wiping secondary cutting edge, wherein the upper side includes a central surface, which is recessed with respect to the plurality of indexable cutting edges, a plurality of positively inclined rake surfaces extending inside the plurality of indexable cutting edges toward the central surface, each inclined rake surface having a main rake surface portion extending inside the main cutting edge, a corner rake surface portion extending inside the corner cutting edge, and a secondary rake surface portion extending inside the surface-wiping secondary cutting edge, wherein a concave indentation is formed in the corner rake surface portion and in at least an initial part of the main rake surface portion adjacent to the corner rake surface portion of at least one of the inclined rake surfaces, wherein the concave indentation has an elongated shape; and
a bisector of the corner cutting edge arranged to divide the concave indentation into a major portion and a minor portion, wherein the major portion is larger than the minor portion and extends in the corner rake surface portion and into the initial part of the main rake surface portion, and wherein the minor portion extends only in the corner rake surface portion, the concave indentation having a largest width in the corner rake surface portion, the largest width of the concave indentation being similar to the width of the respective inclined rake surface in which the concave indentation extends.