| 摘要 |
The tangential insert of a type possible to index and the end-milling cutter are intended for milling the right corners of parts being treated. Using them helps raise the efficiency of the treatment of parts made of materials difficult to machine. The specific shape of the insert cutting edges and their arrangement with respect to the body of the end-milling cutter ensure normal release of the milling chip and better quality of the right corner shaping of the parts subjected to machining. The tangential cutting insert (10) has two identical opposite end surfaces (12) with two identical major side surfaces (18) shaped basically as a parallelogram, and two identical opposite minor side surfaces (16) extending therebetween. Each end surface (12) has a peripheral edge (40) comprising cutting edges (52) and four corners, of which two diagonally opposed corners (24) are situated lower, and the other two corners (26) are located higher. Each end surface (12) is provided with an abutment member (28) having an abutment surface (30). In each cross section of the cutting insert made in a plane parallel to a secondary plane (P1) of the insert, the abutment surface (30) of the concrete end surface (12) is situated closer to the intermediate plane (M) than the respective leading sector (54Æ) of one of the main cutting edges (54) of the concrete end surface (12).
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