End-mills made of hard metal and ceramic combined by brazing method

An end-mill (A) comprising a shank (B) and a cutting portion (C), in which said cutting portion (C) comprises:

• a cutting diameter (1) varying between 2 to 7 mm or 13 to 20 mm,
• at least one web thickness (18) found at a blade (26) part,
• at least one helix angle (10) having a cutting edge (13) thereon,
• a core diameter (16) that is at least 0.8 times the cutting diameter (1),
• at least one corner radius (5) found at a tip part of the blade (26) part between a plurality of flutes (9) and an axial rake angle and radial rake angle (17) at which a cutting operation is made;
• wherein, the end mill comprises a joint type in joining metal and ceramic pieces by a brazing method, wherein between the shank and the cutting portion is a brazing area that includes a brazing material which joins the shank with the cutting portion,
• wherein the joint type is selected from the group consisting of front joint type, lap joint type, front-lap joint type and scarf joint type.

A brazed end-mill (A) of combined metal and ceramic-based materials, comprising a shank (B) and a cutting portion (C), in which said cutting portion (C) comprises:

• a cutting diameter (1) varying between 2 to 7 or 13 to 20 mm,
• at least one web thickness (18) found at a blade (26) part,
• at least one helix angle (10) having a cutting edge (13) thereon,
• a core diameter (16) that is at least 0.8 times the cutting diameter (1),
• at least one corner radius (5) found at a tip part of the blade (26) part, between a plurality of flutes (9) and an axial rake angle and radial rake angle (17) at which a cutting operation is made;
• wherein between the shank and the cutting portion is a brazing area that includes a brazing material which joins the shank with the cutting portion to form the brazed end mill of combined metal and ceramic-based materials.