US 11,654,492 B2
Indexable drilling inserts
Ravi Halasur, Bangalore (IN); and Mahesh Todkar, Bangalore (IN)
Assigned to KENNAMETAL INDIA LTD., Bangalore (IN)
Filed by KENNAMETAL INDIA LIMITED, Bangalore (IN)
Filed on Jun. 11, 2020, as Appl. No. 16/898,811.
Claims priority of application No. 201941023533 (IN), filed on Jun. 13, 2019.
Prior Publication US 2020/0391297 A1, Dec. 17, 2020
Int. Cl. B23B 27/14 (2006.01); B23B 27/16 (2006.01); B23B 51/00 (2006.01)
CPC B23B 27/143 (2013.01) [B23B 27/145 (2013.01); B23B 27/1611 (2013.01); B23B 51/0008 (2022.01); B23B 51/0011 (2022.01); B23B 2200/204 (2013.01); B23B 2200/208 (2013.01); B23B 2251/50 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A drilling insert comprising:
a top surface;
a bottom surface having a smaller surface area than the top surface;
four side surfaces adjoining the top surface and the bottom surface;
four cutting edges at the intersection of each of the side surfaces and the top surface defining four corner edge portions at intersections between adjacent cutting edges, each of the cutting edges comprising:
a first cutting edge segment extending from a first one of the corner edge portions that is located radially outward from a central longitudinal rotational axis of a drilling body when the drilling insert is mounted in the drilling body;
a second cutting edge segment extending from the first cutting edge at a second cutting edge angle with respect to the first cutting edge segment; and
a linear wiper edge located radially inward from the central longitudinal rotational axis of the drilling body in relation to the first cutting edge segment at a wiper edge angle with respect to the first cutting edge segment to a second one of the corner portions, wherein the wiper edge angle is a negative angle with respect to the first cutting edge segment ranging from about 0.5 to about 10 degrees.