Surface Properties and Tool Wear of Si₃n₄-hBN Machinable Ceramics in Endmill Machining using Tungsten Carbide Tool

텅스텐 카바이드 공구를 사용한 앤드밀 가공에서 Si₃n₄-hBN 머시너블 세라믹스의 표면특성과 공구마멸

The machining process of ceramics can be characterized by cracking and brittle fracture. In the machining of ceramics, edge chipping and crack propagation are the principal reasons to cause surface integrity deterioration. Such phenomenon can cause not only poor dimensional and geometric accuracy, but also possible failure of the ceramic parts. Thus, traditional ceramics are very difficult-to-cut materials. To overcome such problems, in this paper, h-BN powder, which gives good cutting property, is added for the fabrication of machinable ceramics by volume of 5, 10, 15, 20, 25 and 30%. The objectives of this paper is to evaluate the fracture phenomenon of the tungsten carbide tool and the variation of surface integrity of the manufactured machinable ceramics under various cutting conditions during end mill machining With CNC machining center.