Authors: Zhan Qiang Liu, Xing Ai
446
Authors: D.L. Wang, Y.Q. Kong
Abstract: The design for orthogonal cutting experiment is made according to the characteristics of a
new kind of nickel-based super alloy. The machinability of this new material in milling and drilling
operations, including cutting force and tool wear, has been researched through experiments and then
the empirical formulas of cutting force in milling and drilling have been presented. The research is
useful in selecting the tool geometry and cutting parameters for machining the new material in
practice.
220
Authors: José Vitor C. Souza, Maria do Carmo de Andrade Nono, Rodrigo de Matos Oliveira, M.V. Ribeiro, Olivério Moreira Macedo Silva
Abstract: During gray cast iron cutting, the great rate of mechanical energy from cutting forces is
converted into heat. Considerable heat is generated, principally in three areas: the shear zone, rake
face and at the clearance side of the cutting edge. Excessive heat will cause undesirable high
temperature in the tool which leads to softening of the tool and its accelerated wear and breakage.
Nowadays the advanced ceramics are widely used in cutting tools. In this paper a composition
special of Si3N4 was sintering, characterized, cut and ground to make SNGN120408 and applyed in
machining gray cast iron with hardness equal 205 HB in dry cutting conditions by using digital
controlled computer lathe. The tool performance was analysed in function of cutting forces, flank
wear, temperature and roughness. Therefore metal removing process is carried out for three
different cutting speeds (300 m/min, 600 m/min, and 800 m/min), while a cutting depth of 1 mm
and a feed rate of 0.33 mm/rev are kept constant. As a result of the experiments, the lowest main
cutting force, which depends on cutting speed, is obtained as 264 N at 600 m/min while the highest
main cutting force is recorded as 294 N at 300 m/min.
598
Authors: Han Lian Liu, Chuan Zhen Huang, Bin Zou
Abstract: A multi-scale and multi-phase nanocomposite ceramic cutting tool material Al2O3/TiC/TiN(LTN) with high comprehensive mechanical properties has been successfully fabricated by means of adding micro-scale TiC and nano-scale TiN particles. The cutting performance and wear mechanisms of this advanced ceramic cutting tool were researched by turning two kinds of hardened steel 40Cr and T10A respectively. Compared with the commercial ceramic tool LT55, LTN showed a superior wear resistance with certain machining parameters. The machining tests indicated that the new materials tool is suitable for continuously dry cutting of hardened steel with high hardness at high speed.
318
Authors: Yue Feng Yuan, Wen Ying Zhang, Xing Chang
Abstract: Cutting force experiments in turning aluminum-silicon alloy ZL104 are carried out with cement carbide tool YG8. The influence of cutting parameters on cutting force is obtained based on single factor experiments. The results indicate that depth of cut and feed rate have great influence on cutting force while cutting speed provides just little impact.
971