Double-sided indexable turning inserts

Abstract

The invention relates to a double-sided indexable turning insert having a polygonal basic shape and comprising a plurality of corners, peripheral clearance surfaces and identical upper and lower sides comprising bearing surfaces lying in reference planes parallel to each other and to the neutral plane, which is located midway between the reference planes, and the clearance plane extends at right angles towards the neutral plane. There are main cutting edges along the upper and lower sides, including a nose edge at the corner and two main edges, the main edges converge towards the nose edge and are located on the front face inclined with respect to the neutral plane, the main edge transitions to a secondary cutting edge, which is parallel to the A neutral plane extends and separates each pair of main cutting edges along the same side of the turning insert, the chip-guiding guide surface being located inboard of the chip face of the cutting edge. The main cutting edge has a generally positive geometric shape, and the wedge angle of the cutting edge between the chip face and the clearance face is an acute angle along the nose edge and any section of the two main edges. The main cutting edge becomes easy to cut and generates chips that can be guided in a discreet but noticeable manner by the guide surface located on the inside.

Description

technical field [0001] The invention relates to a double-sided indexable turning insert having a polygonal basic shape comprising a plurality of corners, a peripheral clearance surface and identical upper and lower sides comprising: a flat support surface, the flat bearing surface lies in reference planes, the reference planes are parallel to each other and parallel to the neutral plane, the neutral plane is in the middle between the reference planes, and the clearance surface is at right angles towards the center a plurality of main cutting edges formed along the upper side and the lower side, and separately including a nose edge located in the corner and two main edges facing the nose The edges converge and deviate relative to the bisector, wherein the nose edge is formed between the front chip portion surface and the convex portion of the clearance surface and thus has an arcuate cutting edge line, while the main edge is formed in the lateral chip portion between the flat ...

AI Technical Summary

Problems solved by technology

However, a disturbing disadvantage of known turning inserts is that the nose edge and the two main edges, which together form the main cutting edge, have a negative cutting geometry because they are formed on the chip surface and the clearance surface In between, the chip surface and the clearance surface form an angle of 90° with each other, that is, the wedge angle of the cutting edge along the main cutting edge reaches 90° in its entirety

Although in practice this means that the main cutting edge becomes stronger, but on the other hand has a significantly duller cutting edge than a cutting edge with a positive cutting geometry

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