Milling tool for chip removing machining

摘要

A milling tool is equipped with milling inserts, below which there are disposed shim plates, the primary function of which is to protect the basic body of the tool in the event of insert breakdowns. The shim plate is formed with a protuberance, in which an auxiliary cutting edge is included, which, in the assembled state of the tool, is located along an inactive cutting edge, which is situated radially inside an active chip removing cutting edge. By means of the auxiliary cutting edge, the milling tool can be utilized for ramping operations without risk of the inactive cutting edge of the milling insert being damaged.

主权项

1. A milling tool, comprising:
a basic body rotatable on a primary center axis including front and rear ends, between which there is disposed an envelope surface that is rotationally symmetrical in respect to the center axis; a seat formed in a peripheral transition surface extending between the envelope surface and the front end; a removably fixed shim plate housed in the seat, the shim plate including an under side arranged to press against a bottom of the seat, an upper side formed with a support surface, and a side surface extending between the upper and under sides; and a replaceable milling insert including a secondary center axis, an upper side that joins a lateral clearance surface via at least two alternately usable individual cutting edges, and an under side that faces the upper side of the shim plate, the individual cutting edges being equidistantly separated from the secondary center axis that defines a centering position of the milling insert in the basic body, and one of the at least two cutting edges spaced apart farthest axially away from the basic body being located radially outside the other cutting edge in order to be active during chip removal at the same time the one cutting edge is inactive, wherein the shim plate includes a protuberance having an auxiliary cutting edge that is delimited between a chip surface and a clearance surface, the auxiliary cutting edge projecting laterally from the inactive cutting edge.