Patent ID: 6142716
Filing Date: 2000-11-07
Classification: B23C,Y10T

Abstract:
Cutting insert adapted to be mounted in a pocket of a milling body to be rotated in a milling machine,the cutting insert comprising:an upper side constituting a chip surface,a lower side constituting a support surface,first and second major sides each intersecting the upper side, andfirst and second minor sides each intersecting the upper side and each interconnecting the first and second major sides;the insert further including a pair of cutting edges formed by the intersection of the upper side, the first major side and the first minor side,the pair of cutting edges comprising a major cutting edge extending along the first major side, and a minor cutting edge extending along the first minor side,the major cutting edge and the minor cutting edge intersecting one another to form a cutting corner,the major cutting edge sloping to form an acute angle with the lower side;the first major side and the first minor side forming a ledge structure underlying the pair of cutting edges, the ledge structure including a minor ledge underlying the minor cutting edge, and a major ledge underlying the major cutting edge, the minor ledge and the major ledge each forming an outwardly facing clearance surface, the minor ledge having a height less than a remaining height of the first minor side, and the major ledge having a height less than a remaining height of the first major side;the major ledge extending along at least a portion of the length of the first major side, a lower end of the major ledge being stepped outwardly with respect to a plane defined by a portion of the first major side disposed below the major ledge, a plane defined by the clearance surface of the major ledge being in non-intersecting relationship with a remaining portion of the major side disposed therebelow, whereby the clearancesurface of the major ledge can be ground independently of the remaining portion of the major side,the minor ledge extending along only a portion of a length of the respective minor side, a lower end of the minor ledge being stepped outwardly with respect to a plane defined by a portion of the minor side disposed below the minor ledge, a plane defined by the clearance surface of the minor ledge being in non-intersecting relationship with a remaining portion of the minor side disposed therebelow, whereby the clearance surface of the minor ledge can be ground independently of the remaining portion of the minor side;each of the major sides having a recess formed therein.