Double-sided, Indexable Turning Insert

Abstract

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 under sides, in which there are included support surfaces situated in a reference plane, which are parallel to each other and to a neutral plane, which is situated halfway between the reference plane and toward which the clearance surface extends at a right angle. Along the upper side as well as the under side, primary cutting edges are present, which individually include a nose edge situated in a corner and two main edges, which converge toward the same and are located in a nose plane inclined in relation to the neutral plane, and which transform into auxiliary cutting edges, which run parallel to the neutral plane and separate each pair of primary cutting edges along one and the same side of the turning insert, chip-directing guide surfaces being placed inside the chip surfaces of the cutting edges. According to the invention, the primary cutting edge has a generally positive cutting geometry so far that a wedge angle of the cutting edge between the chip surface and the clearance surface is acute in arbitrary sections along the nose edge as well as along the two main edges. In such a way, the primary cutting edge becomes easy-cutting and produces chips that can be guided in a careful, although distinct way by the guide surfaces being 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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