Authors: Zhan Qiang Liu, Xing Ai
446
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: Yi Wan, Zhan Qiang Liu, Xing Ai
Abstract: Five-axis milling is widely used in machining of complex surfaces parts. Part quality and productivity are extremely affected by cutting force and tool wear, especially thin-walled complex surface, such as turbine blade. Although extensive research has been conducted on cutting force and tool wear in 3-milling process, very few are on 5-axis milling and bull-nose mills. This paper presents cutting forces with various cutting conditions as well as tool wear patterns in five-axis milling super alloy, which is essential to cutting vibration and defelction analysis of thin-walled complex surfaces parts. The roles of lead angle and tilt angle in five axis milling were investigated, which provide data for NC program edit. In addition, experiments in this research proved that tool wear played affected cutting forces outstandingly.Therefore, tool wear played an very important role in tool change.
2049
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: Yuan Wei Wang, Song Zhang, Jian Feng Li, Tong Chao Ding
Abstract: In this paper, Taguchi method was applied to design the cutting experiments when end milling Inconel 718 with the TiAlN-TiN coated carbide inserts. The signal-to-noise (S/N) ratio are employed to study the effects of cutting parameters (cutting speed, feed per tooth, radial depth of cut, and axial depth of cut) on surface roughness, and the optimal combination of the cutting parameters for the desired surface roughness is obtained. An exponential regression model for the surface roughness is formulated based on the experimental results. Finally, the verification tests show that surface roughness generated by the optimal cutting parameters is really the minimum value, and there is a good agreement between the predictive results and experimental measurements.
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