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Introductions Ultraprecise machining technique plays an important role in improving performance and quality of machine and electric appliance and in developing high-tech products, it marks the manufacturing level of a country and is the foundation for the development of advanced science and technology of countries [1].
The ultrasonic polishing machining (UPM) has the features of high removal ratio and high efficiency, but is apt to defect on surface of hard and brittle metallic materials [2-4].
The Eq.10 is the removal model based on UPM-PECM compound finishing mechanism on hard and brittle metal material.
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In this paper, the Material Relative machinability in [12] can be used as the evaluation index of materials in the tool life prediction models, which shows in Table 1.
Table 1 Levels of material relative machinability [12] Level Type of Material Machinability Kr Typical materials 1 Common non-ferrous metal >3.0 Copper alloy 2 Easy-cutting material 2.5~3.0 15Cr by annealing 3 1.6~2.5 No.30 steel 4 Common material 1.0~1.6 No.45 steel 5 0.65~1.0 2Cr13 by modulation 6 Difficult-to-machine material 0.5~0.65 45Cr by modulation 7 0.15~0.5 α-titanium alloy 8 <0.15 β-titanium alloy Cutting parameters: includes cutting velocity, feed and cutting depth.
In this model, speed, feed, cutting depth and workpiece materials are the input vectors and tool life is the output vector.
Acknowledgments The research is supported by National Science and Technology Major Project of the Ministry of Science and Technology of China (Grant No. 2014ZX04012014).
Palmay, Cutting Tool Life in Machining at Various Speeds, Key Engineering Materials. (2014) 581-582

(2) Material Properties.
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Materials and Methods.
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Now many scientists are studying the semiconductor materials which meet these conditions.
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Studied materials For the studied dredged materials, the physical characteristics are presented in Table 1.
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The relevant damage evolution is described by a tension softening model based on isotropic damage concept and all materials are considered elastic before the crack initiation.
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The aim of this work is to formulate a process to separate the heavy residues oil due to the difficulty in the dealing with and regeneration of waste materials such as waste lubricating deep metamorphic degree[7] and the mixed oil source.
The remaining heavy residue as raw materials of heavy fuel oil was stored in V102.
Wang: Advanced Materials Research, Vols. 726-731(2013), pp. 2979-2982 [2] Richard H O.
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[9] Lamia Zuñiga Liñan, Nádson Murilo Nascimento Lima, Maria Regina Wolf Maciel, Rubens Maciel Filho, Lílian Carmen Medina and Marcelo Embiruçu: Journal of Petroleum Science and Engineering Vol. 78 (2011), pp. 78 –85