Authors : S. Mekhilef , W. Bendjeddou , M. Labaiz and A. Bouchelaghem
Abstract: The current tendency in research in very high resistance materials to wearing such as materials used in machining are: Metallic materials (carbide), non-metallic materials (ceramic, nitride), coverings (in mono or multi layers) of material after material, insertions (injection or insertion of material inside material). These materials and methods use sssmainly powders metallurgy in the elaboration. This technology has developed the rationing in the chemical composition and also in the layers. The diversification in compositions brings in naturally a structural variation and consequently, a variation of physic mechanical properties. As the materials form the parts, they are subject to external charges. The aim of our research is, indeed, to relate and to set the material according to its charges. This is what drives one to make one`s own material according to the functional requirements (dynamic, thermal, kinematic) of the part. To use this approach, we have chosen the machining board, a part which is always subject to almost extreme external changes (forms, frictions, temperatures...). The board, soldered or detachable, appears in diverse forms (triangular, squared, rounded), with or without chip breakers, of varying geometry related to the piece and forms related to their fixations. Metallic carbide boards are widely used in machining through metal removing. In general, they are made up of WC, of TiC, of Nbc, of Co or other relating materials. In the case of machining standard boards, each of these carbide compositions takes up the whole volume of the board. The use of this methodology in the design of materials to the machining board lies in dividing up the penetrating parts or edges and the support parts. In this way, a rationalization of the volume of the board and, after that, a material economy may be considered. An insertion of noble materials piece may be used in the cutting part, when the other parts may receive materials of acceptable properties but low-priced. The definition of the parts or zones of the board, according to the varied requirements, is made by the method of finished elements taking into consideration functional parameters (v, a, p) and characteristics for materials development (E, , ) and those of materials for machine-cutting. This design takes also into account the behaviour of interface or inter-zone materials. The present research has enabled us to develop a chipped materials design software for metallic carbide squared boards. In order to confirm the results of the research, a prototype of boards design and elaboration following this method has been realised.
S. Mekhilef , W. Bendjeddou , M. Labaiz and A. Bouchelaghem , 2007. Forces and Temperatures Distribution Simulated on a Metal Carbide Chip of Cutting . Journal of Engineering and Applied Sciences, 2: 1476-1483.