Abstract:
The present invention relates to an indexable insert for chip removing machining. The cutting insert (10) has a negative, polygonal basic shape and comprises cutting corners (17). Each cutting corner comprises a nose edge (18) and a minor cutting edge (19; 19'). The nose edge connects to a major cutting edge (15A, 15B) and to the minor cutting edge. A bisector (B) of the corner intersects the nose edge. Upper cutting edges (15A, 15B) are formed in transitions between a top side (11) and an edge surface (13) of the cutting insert. Lower cutting edges are formed in transitions between a bottom side (12) and the edge surface (13). Said sides (11, 12) constitute a rake face in one position and a support surface in another position and said edge surface (13) constitutes an edge surface. Each cutting corner (17) is asymmetrical in relation to the bisector (B) of the corner. The nose edge (18) is defined by a radius (R1) that is smaller than a radius (R2) of the minor cutting edge. Each side (11, 12) comprises a plurality of nose edges (18), which at least partly touch a plane (P). An imaginary line (L), which is perpendicular to the plane (P) and tangent to the minor cutting edge (19), intersects the edge surface (13). The minor cutting edge (19) is curved. The invention also relates to a method for manufacturing a cutting insert for chip removing machining.
Abstract:
The invention relates to a cutting insert, intended for chip removing machining, which includes a cutting geometry surface (7), which counted from a cutting edge (11) includes a primary chamfer (24) that transforms into a chip removing surface (25), which is inclined in the direction inwards/downwards in order to permit sinking of a chip being under formation, and which transforms into a deflection surface (26) arranged to be met by the chip and at least initiate deflection or guiding away of the same from the cutting insert. The angle of inclination (δ) of the chip removing surface (25) does not exceed 18°, in addition to which, the level difference N 1 between the primary chamfer and the chip deflection surface (26) amounting to maximally 0,20 mm.
Abstract:
A hard sintered compact throwaway tip comprising a tool base material, seat grooves provided at all corners and on both upper and lower sides of the base material, and pieces of hard sintered compact as cutting edges being brazed to the seat grooves, wherein the pieces of hard sintered compact are brazed by the use of, typically, a brazing filler metal consisting of 0.5 to 65 wt % of Ti and/or Zr and the balance composed of Cu and inevitable impurities and by heating under vacuum or in an inert gas atmosphere, and wherein the thickness of the base material between upper and lower seat grooves is 30 to 90 % the total thickness of the hard sintered compact throwaway tip and the length of the cutting edge of the hard sintered compact is 0.5 to 4 mm. The hard sintered compact throwaway tip not only exhibits good performance, but also can be manufactured at a reduced cost.
Abstract:
A drill comprising a tip-forming end including at least two cutting edges (8, 8') and at least two chip flutes (7, 7') extending from the tip end (2) towards the second end (3), having the purpose of forming and removing chips from the corresponding cutting edge. In accordance with the invention the drill tip is composed of cutting edges on mutual sides of the axial centre line having a straight unbroken contour, the central portions of which extend axially beyond the peripheral portions whilst the nose radiused surface on each cutting edge at the periphery is provided with a smoothly curved radius comprising one or several circular segments with mutually different radii (R1, R2, R3) where adjacent radii always appear with different size.
Abstract:
An indexable cutting insert for turning has in each operative corner portion a sequence of at least five different radius segments (5A, 5A', 5B, 5B', 5C). The middle segment (5C) has a first radius (r epsilon ), the two adjacent segments (5B, 5B') both have a second radius (r2), and the two segments (5A, 5A') located outside those segments both have a third radius (r3), the relation between the radii being r3 > R epsilon > R2. Possibly, there may also be two fourth segments with a fourth radius (r4) adjacent and outside the third segments (5A, 5A'). Cutting inserts with nose radii modified in this way have made possible considerably better surface smoothnesses than cutting inserts with a constant radius. Furthermore, the sensitivity to the positioning of a correct entering angle has been considerably reduced.
Abstract:
A cutting insert in a non-limiting embodiment may include a first surface, a second surface, a third surface and a land surface. The first surface may include a first corner and a first side extended from the first corner. The land surface may be located between the first surface and the third surface and inclined relative to the first surface and the third surface. The land surface may include a first land surface located along the first corner, a second land surface located along the first side, and a third land surface having a concave shape which is adjacent to the second land surface and located further away from the first land surface than the second land surface.
Abstract:
A method to form a surface on a metal work piece includes providing a turning insert having a first cutting edge, a second cutting edge and a convex nose cutting edge connecting the first and second cutting edges, a nose angle formed between the first and second cutting edges being less than or equal to 85°; arranging the second cutting edge such that it forms a back clearance angle of more than 90° in a feed direction; positioning all parts of the turning insert ahead of the nose cutting edge in the feed direction; rotating the metal work piece around a rotational axis in a first direction; and moving the turning insert in a direction parallel to or at an angle less than 45° relative to the rotational axis, such that the surface at least partly is formed by the nose cutting edge.
Abstract:
A cutting insert includes a rake face, a flank face, a cutting edge formed at a ridge where the rake face and the flank face intersect, a land provided on the rake face along the cutting edge, a breaker groove provided in the rake face inside of the land, and a curved surface formed between a groove surface of the breaker groove and the land. A radius of curvature of the curved surface is 0.5 mm or greater.
Abstract:
A cutting insert has a first cutting edge provided with a chip breaker suitable for cutting an outermost region of a hole. The cutting insert has a substantially polygonal upper face, a substantially polygonal lower face, and a plurality of side faces extending between the upper face and the lower face. The plurality of side faces include a main side face constituting a flank of a linear cutting edge and a sub side face constituting a flank of a corner cutting edge; the main side face has a relief angle of 0°, the sub side face has a relief angle larger than 0°. A second cutting edge is further provided at an intersection portion between the main side face and the lower face.
Abstract:
A cutting insert of one embodiment is provided with: an insert body having a top surface that has a corner section, a bottom surface, and side surfaces; a cutting edge that is positioned at an intersection between the top surface and the side surfaces, and includes a corner cutting edge, a first cutting edge and a second cutting edge; a rake face that slopes downward away from the cutting edge; and a first raised port that is positioned inside the rake face, and rises upward. The first raised part includes a protruding section that protrudes toward the corner cutting edge. The cutting insert is further provided with a second raised part that extends toward the first cutting edge and the second cutting edge from the protruding section, and has a convex curved shape in which, when viewed from above, the outer peripheral edge on the corner section side.