Shanghai, China
Shanghai, China

Time filter

Source Type

Wang Y.,Shanghai University | Cui X.,Shanghai University | Xu H.,Shanghai Tool Works Co. | Jiang K.,Shanghai Tool Works Co.
International Journal of Advanced Manufacturing Technology | Year: 2013

The cutting forces are studied for the reaming of casting aluminium alloy ZL102 (ZAlSi12) using a four-flute PCD reamer on DMG DMU 50 linear five-axis CNC machine. Kistler Dynamometer is used to measure the cutting force (X-, Y- and Z-axes) and torque. Three-coordinate measuring machine is used for measuring cylindricity of machined hole. The cutting force signatures are diagnosed by using Fast Fourier Transform (FFT) algorithm. FFT analysis suggests that fundamental frequency is only determined by cutting speed. The frequency for the thrust signal of cutting force is zero which illustrates that the thrust is constant when cutting speed and cutting feed are fixed. The relationship between the cutting force and cutting parameter are investigated by using FFT filtering. High value of cutting feed and the low cutting speed provide the higher thrust. The optimized machining parameters are provided relative to cutting force (Fx and Fy) and the cylindricity of reamed holes. © 2012 Springer-Verlag London.

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.

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.

Wang G.C.,Jiangsu University | Hua C.L.,Jiangsu University | Liu J.D.,Jimei University | Pei H.J.,Jiangsu University | Liu G.,Shanghai Tool works Co
Key Engineering Materials | Year: 2011

The grinding process is currently used for most of the parts requiring good precision. However, the apparition of some damage related to this process is still uncontrolled. The major deterioration is from residual stress. In order to investigate the residual stresses caused by mechanical plastic deformation, thermal plastic deformation and phase transformation in ground components, a feasible numerical method was developed to accommodate appropriately thermal stress and phase transformation in a workpiece experiencing critical temperature variation during grinding. The change of the material properties was modeled as function of temperature history. The wheel velocity Vs is a key factor in determining the distribution of residual stress; both the surface residual stress and the depth of residual stress are induced with the increase of the wheel speed. © (2011) Trans Tech Publications.

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.

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.

Yuan Y.,Donghua University | Ding J.,Donghua University | Wang Y.,Shanghai Tool Works Co. | Wang Q.,Shanghai Tool Works Co. | And 2 more authors.
International Journal of Refractory Metals and Hard Materials | Year: 2014

Functionally gradient WC-Co hardmetals not containing η phase with a Co depleted surface layer can be produced by heat treating WC-Co in a carburizing atmosphere. This study investigates the effect of process parameters of carburizing heat treatment, such as time, temperature, volume fraction of methane in carburizing atmosphere, and flow rate of mixed gases on cobalt gradient structure in functionally gradient WC-Co. Taguchi method is used to formulate the experiment layout, and the range analysis and the analysis of variance are employed to determine the optimal process parameter levels and to analyze the effect of parameters on cobalt gradient structure. The results indicate that the order of significance of the parameters on both thickness and amplitude of cobalt gradient is temperature followed by volume fraction of methane, time and flow rate of mixed gases. Both the thickness and the amplitude of the gradients increase with increasing temperature and time, and decrease with increasing volume fraction of methane, and first increase then decrease with increasing flow rate of mixed gases. Finally, the optimal combination of process parameters for fabricating functionally gradient WC-Co composites is determined. © 2013 Elsevier Ltd.

Yuan Y.G.,Donghua University | Ding J.J.,Donghua University | Wang Y.K.,Shanghai tool works Co. | Sun W.Q.,Shanghai tool works Co.
Applied Mechanics and Materials | Year: 2013

The carburizing heat treatments of ultrafine-grained WC-Co composites with substoichiometric carbon content were carried out, and the microstructures of ultrafine-grained WC-Co carbides before and after treated were characterized by means of scanning electron microscopy and X-ray diffraction. The results show that the functionally gradient ultrafine-grained WC-Co hardmetals with a Co depleted surface and not comprising the β-phase can be fabricated by carburizing heat treatment. After heat treatment, WC grain sizes in materials are still at the ultrafine grade. © (2013) Trans Tech Publications, Switzerland.

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.

Shen C.,Jiangsu University | Wang G.,Jiangsu University | Wang S.,Jiangsu University | Liu G.,Shanghai Tool Works Co.
Advanced Materials Research | Year: 2010

In this research, we computationally analyzed the structural modes of an HSK63E type tool system and verified the results with experimental modal analysis (EMA). The computation was implemented using the finite element method (FEM) based on a linear-elastic theory, with which we computed the natural frequency and obtained the modal shapes under both free and operating conditions. With the method of experimental modal analysis, we also obtained structural modal parameters including the natural frequency, modal shapes and damping ratio under the same free and operating conditions. The computational data were compared with the experimental findings. The reasonable agreement between the two data sets indicated the validity and provided a theoretical basis for using computational methods for determining the natural characteristics and influencing factors of HSK tool system. With this validated FEM model, further analyses were performed to evaluate the unique dynamic performance of the HSK tool system, and to apply dynamic optimum design to other types of HSK tool system. © (2010) Trans Tech Publications.

Loading Shanghai Tool Works Co. collaborators
Loading Shanghai Tool Works Co. collaborators