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Zhong N.,Shanghai Maritime University | Zhou Y.X.,Shanghai Tool Works Co. | Zhu X.F.,Shanghai Tool Works Co. | Zhang J.J.,Shanghai Tool Works Co. | Li G.Y.,Shanghai JiaoTong University
Surface Engineering | Year: 2011

TiN, TiCN and TiAlN coatings were deposited on K20 cemented carbide tools by arc ion plating method. The microstructure and mechanical properties of the coatings were investigated using an X-ray diffractometer, a scanning electron microscope and micromechanic probes. The cutting performances of the coated mills and drillers were accessed by milling and drilling the quenched and tempered 40Cr steels under dry and high speed cutting conditions. The performance of K20 cemented carbide tools was evaluated with respect to the tool wear and the torque generated during the cutting. The results revealed that the cutting tools coated with TiCN and TiAlN films obviously outperformed those with TiN film, especially at high cutting speeds. © 2011 Institute of Materials, Minerals and Mining. Source


An Q.L.,Shanghai JiaoTong University | Guo G.Q.,Shanghai JiaoTong University | Zheng X.H.,Shanghai JiaoTong University | Chen M.,Shanghai JiaoTong University | And 2 more authors.
Key Engineering Materials | Year: 2010

13%Cr stainless steel has good comprehensive performance, which makes it suitable to work under the condition of high temperature, high pressure and corrosive environment, such as petroleum industry. It can be used as materials of petroleum pipes with buttress thread. Buttress thread turning is a heavy-load machining, which places high requirement on the cutting tool. Based on the cutting characteristics of buttress thread, the machinability of 13%Cr stainless steel is studied by turning experiments. Two kinds of inserts with different geometries were employed in buttress thread turning experiments. Experimental results show that less cutting force, longer tool life, better chip curling effect and surface quality was acquired for the insert with rake angle of 12° , clearance angle of 3° and chip-curling groove during 13%Cr stainless steel buttress thread turning process. © (2010) Trans Tech Publications, Switzerland. Source


Hua C.,Jiangsu University | Wang G.,Jiangsu University | Pei H.,Jiangsu University | Liu G.,Shanghai Tool Works Co.
Advanced Materials Research | Year: 2012

Thermal stresses of grinding plays an important role on the fatigue and wear resistance of the component. A comprehensive analysis of thermal stress induced by surface grinding has been conducted with aid of the finite element method. To obtain a reliable figure of thermal stress induced by grinding, temperature-dependent properties of workpiece materials were taken into account. The developed finite element procedure has also been applied to calculate the surface and sub-surface thermal stress induced by moving source of triangular heat when convection and radiation is occurred over the whole work. Based on an analysis of the effects of wheel velocity on the thermal stress distributions in an elastic-plastic solid, some important conclusions were given. Source


Shen C.,Jiangsu University | Wang G.,Jiangsu University | Wang S.,Jiangsu University | Nie W.,Jiangsu University | Liu G.,Shanghai Tool Works Co.
Advanced Materials Research | Year: 2011

In this study, an integrated methodology combining computational modal analysis, experimental modal analysis, and computational dynamic analysis was developed to investigate unbalancing dynamic responses of high speed machining tool systems. A linear-elasticity formulation based on the finite element method (FEM) was employed to compute the natural frequencies and obtain the corresponding modal shapes. Experimental modal analysis was then performed to verify the natural frequencies. After the validation, the FEM model was further modified to predict the dynamic responses, with an HSK (a Germany abbreviation of Hohl Schaft Kegel) tool system as a model system. The results indicated that, by validating the computed natural frequencies with experimental ones, an effective simulation model can be established for predicting complex dynamic response of high speed machining tool systems. Source


Hua C.L.,Jiangsu University | Wang G.C.,Jiangsu University | Pei H.J.,Jiangsu University | Liu G.,Shanghai Tool Works Co.
Advanced Materials Research | Year: 2011

The present study aims to investigate the temperature field by using the different heat fluxes, such as rectangle heat flux, triangular heat flux, inclined triangular heat flux, circular heat flux. To obtain a reliable figure of temperature field induced by grinding, temperature-dependent properties of work materials were taken into account and a convection model with an effective cooling factor was introduced. A thorough analysis using the finite element method showed that predictions were very agreed with the results of the experiment. Finally, the present paper showed that the contact angle must be taken into account in future models. Source

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