| 摘要 |
A four-sided insert for milling cutters with negative radial angle of the cutting edges for three-dimensional milling from a solid, which has an upper face, or rake face, that is delimited by four sides that constitute the cutting edges of the insert. The four sides are opposite in pairs and connected to corresponding sides of the lower face by lateral faces. Two opposite sides of these four sides constitute main cutting edges of the insert and the other two sides constitute secondary cutting edges. The lateral faces that connect the main cutting edges to the lower face of the insert have, proximate to one end or tip of the cutting edge, a positive lower relief angle that is greater than the lower relief angle, which can be positive or negative or nil, proximate to the other end or tip of the cutting edge.
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