bluuebunny/crossref_metadata_2025 huggingface dataset:
Study of Material Modeling Strategies for Deformability Analysis of Rectangular Cups
Authors: Lemu Hirpa G. , Trzepieciński T.
Published: April 2012

A comparative study of different material modeling strategies in deformability analysis of rectangular cups is presented in this paper. The article focuses on application of dynamic explicit and static implicit approaches in Finite Element Methods (FEM) for metal forming simulation where different material models and contact conditions with friction are involved. The simulated results are verified using results from experimental study of the deformation on the same material. Further, a comparison between a quadratic Hill anisotropic yield criterion and von Mises yield criterion with isotropic hardening has been studied. The results confirm that the dynamic explicit method is more efficient in simulating sheet metal forming processes. The study shows also that the finite element analysis undoubtedly gives good approximate numerical results to real processes when the material and friction anisotropy are considered.
Analysis of Cutting Forces during Dry Turning Processes of UNS A92024-T3 Aluminium Bars
Authors: de Agustina B. , Rubio E.M.
Published: April 2012

In the aeronautical and aerospace industries there is a great demand of materials with high resistance and low weight such as the aluminium alloys for the production of different elements that conforms the airships and aerospace vehicles. In this work, an experimental study was carried out in order to analyse the influence of the cutting parameters (feed rate, cutting speed and type of tool) on the forces generated during dry turning tests of UNS A92024-T3 aluminium bars. The main influents factors on the forces were the feed rate and the interaction between type of tool and the spindle speed.
Analysis of Technological Factors in Open Die Forging by Comparison of Different Analysis Methods
Authors: Olivares F.J. , Camacho A.M. , Sebastián M.A.
Published: April 2012

The scope of this work is to study a forging process at room temperature and at macroscopic level. The mechanism of deformation is influenced by the friction and the reduction ratio, but the influence of the geometry of the billet (aspect ratio) needs also to be taken into account. The objective will be to compare the results obtained during a simulation with the code based on Finite Element Method (DEFORM 2D/3D), with those obtained by analytical methods in order to validate the numerical model. Taking into account that deformation is not uniform and the free surface suffers a phenomenon known as barrel-shaped, that is not covered by analytical methods, the data obtained will compared with those obtained with the FEM code ABAQUS. The aim of this comparison between analytical and numerical methods using two commercial codes instead one, is a proposed way to validate a Finite Element simulation when experimental data are not available or do not exist yet.
Comparison between a Laser Micrometer and a Touch Trigger Probe for Workpiece Measurement on a CNC Lathe
Authors: Valiño G. , Suárez C.M. , Rico J.C. , Álvarez B.J. , Blanco D.
Published: April 2012

The current requirements for an efficient dimensional inspection of manufactured parts have lead to development of different in process and on-machine measurement (OMM) techniques. Touch trigger probes (TTP) are the most common technologies utilized, inspired on contact probes used on coordinate measuring machines (CMMs). The on-machine accuracy of TTPs depends upon precision of the tool-machine control as well as upon the procedure for TTP presetting. Taking this into account, a different OMM technique is considered in this work, which consists on a laser micrometer (LM) that is commonly used for in-process measurement of continuous products. The behaviour of TTP and LM is analysed and discussed in terms of repeatability and reproducibility. Results obtained by both techniques are compared each other by measuring a cylindrical workpiece and by checking the results with those obtained on a CMM.
Experimental Analysis of Process Parameters to Manufacture Micro-Cavities by Micro-Milling
Authors: Gomar J. , Amaro A. , Vázquez E. , Ciurana J. , Rodríguez C.
Published: April 2012

The use of conventional machining processes has been subject to important decline probably due to the increment in the use of emerging technologies. Therefore, the main applications of these traditional processes, such as automotive industry, are in crisis. In order to have a chance to compete successfully in the new trends, the machining industry must meet the needs of alternative sectors such as biomedical field. The aim of this study is to prove the capacity of micro-milling, by machining complex micro-cavities on aluminum workpiece using a conventional milling machine. Results are obtained by evaluating accuracy and geometric features. This study finds that the feed per tooth is a significant factor in order to obtain better results. The use of coolant increases the tool wear and therefore dimensional errors. This scope is a potential opportunity to reutilize the conventional machines from a new approach.
An Approach for Analysis of Bulged Profile and Thickness Distribution of Tube in Free Hydro-Bulging Process
Authors: Liu Xiao Feng , Yang Lian Fa , Zhang Yu Xian
Published: April 2012

Tubular components are widely used in the areas of automotive and aerospace industries due to their excellent properties. A mathematical model considering the bulged region as a parabola curve is proposed to examine the plastic deformation behavior of a thin-walled tube during the free hydro-bulged process. The finite element simulations of the free hydro-bulging process are carried out to verify the approach indirectly. The results indicate that the model is accurate and acceptable to figure out the circumferential radius, wall thickness and axial radius of the bulged profile.
Preparation and Properties of a Custom-Designed Nickel-Based Amorphous Brazing Foil
Authors: Wang Bin , Zhu Tian Yu , Dong Fang Fei , Shen Yan Qing
Published: April 2012

The custom-designed amorphous brazing filler metals in foil form has been developed for application in brazing stainless steel 0Cr18Ni9. The new alloys contains 10.5wt% chromium, 5.4wt% silicon, 1.5wt% boron, 3wt% cobalt and nickel as the balance. The melting range is within 971°C1070°C. The alloy exhibits good melting characteristics and wetting behavior. With a 25μm thick foil, the joint is free of brittle central eutectic phases inside the joint via diffusion of the alloying elements into adjoining base metal and results on a high mechanical joint strength.
Pilot Study of Three-Stage Catalytic Ozonation - Biological Activated Carbon for Drinking Water Advanced Treatment
Authors: Zhang Guang Ming , Shen Qian Qing
Published: April 2012

A novel three-stage catalytic ozonation-BAC process is proposed to treat highly polluted source water. A pilot study of 120 m3/d was performed in south China and lasted 9 months. The results showed that catalysts improved the THMsFP reduction efficiency by around 18% for BAC step and reduced the effluent bromate by 20%-77%; reduced NH4-N to below 1 mg/L; The effluent COD met the national standard under all circumstances.
Pilot Study of Coagulation-Direct Filtration for Low-Temperature and Low-Turbidity Source Water
Authors: Zhang Guang Ming , Kang Xu , Zhao Wei
Published: April 2012

A pilot study was carried out for direct filtration assisted with low-dose coagulation to treat low temperature and low turbidity reservoir water for drinking water. The impacts of filtration rate, gap between coagulation and filtration, coagulant dosage and filtering material were examined. The tested ranges were as following: filtration rate 4-10 m/h, gap between coagulation and filtration 1-5 min, coagulant dosage 4- 20 mg/L. The results show that direct filtration with low-dose coagulation was very effective in treating the low temperature and low turbidity source water. The optimal conditions were as following: PAC dose of 12 mg/L, filtration rate of 6 m/h, gap between coagulation and filtration of 3 min. The effluent turbidity was 0.5 NTU, COD was 2.4 mg/L, and the filtration cycle was 9 h. The coagulant dose was only 40% of that of conventional treatment.
Finite Element Implementations to Predict the Failure of Composite Laminates Under Uniaxial Tension
Authors: Rahimi Norzihan , Musa Mazuki , Hussain Ahmad Kamil , Mahmud Jamaluddin
Published: April 2012

This paper aims to simulate the failure behaviour of composite laminates subjected to uniaxial loading using commercial software (ANSYS) and FE programme (Fortran). For the first time, the built-in failure criteria functions provided by ANSYS were explored extensively and successfully exploited to predict the failure curves of composite laminates. Finite element (FE) models are developed to replicate physical testing. A FE programme is developed using Fortan-90 to determine the lamina stresses based on High Order Shear Deformation Theory (HSDT). These stresses are then used to determine the strength of the plates using the Maximum Stress Failure Criteria. Then FE models are developed using ANSYS to replicate the procedure. Standard ANSYS formulation is utilised and laminate failure was predicted based on Maximum Stress and Tsai-Wu Failure Criteria. The failure curves for both approaches were plotted and found very close to the experiment results. The results show that the FE programme and ANSYS simulations produce an average error of 8% and 15% respectively. Nevertheless, simulations using ANSYS allows easier modification and manipulation. Therefore, it can be concluded the current study is useful and significant and contributes significant knowledge to the failure behaviour of composite laminate. Moreover, the simulations performed could eventually replace tedious and expensive physical testing.
Impact of Step Height on Deformation of Foundation for Wind Power Generator System
Authors: Tian Jing , Guo Yong , Zhang Di
Published: April 2012

The three-dimensional finite element numerical model of foundation for wind power generator unit is created by use of ANSYS. The elastic-plastic constitutive is introduced and the nonlinear contact is set up between the foundation stub and concrete. Impact of step height on deformation of foundation is researched, the deformation characteristic and law of concrete foundation is discussed and It’s more rational to consider the contact status and material nonlinearity. The research results offer scientific basis for design and optimization on foundations of wind power generator system.
Research on Reproduction Characteristics of Digital Laser Plate
Authors: Huang Xue Lin , Jiang Wen Yan
Published: April 2012

Flexographic printing is growing at explosive rate now. With many kinds of plate has introduced, digital laser plate becomes mainstream technique. By experiment method, the microscopic of digital laser plate was analysis, the difference of platemaking process and printing results between digital laser plate and traditional plate was detail probed and the reproduction characteristics of digital laser plate were discusses. Results showed that digital laser plate brings smaller dot gains, broader color gamut and higher printing contrast; it greatly improved the quality of flexographic printing.
Rheological Behavior of Diamond Particle/Epoxy Resin Adhesive Adapted to Screen Printing
Authors: Lv Yong , Ci Song , Zhu Long
Published: April 2012

The thermal conductivity & insulating adhesive was prepared by mixed with diamond particles, epoxy resin (E-20), methanol etherified amino resin, ethylene glycol monobutyl ether (BCS), mixed diethyl ester (DBE), and other additives. The influence on rheological behavior of different particle sizes, volume content of diamond particles was studied. Meantime, the effect of different concentration of dispersant and flatting agent was also investigated. The mechanism of the rheological behavior was analyzed.
Influence of Processing Methods on Number and Form of Cracks of Bionic Units on Vermicular Cast Iron
Authors: Liu Yan , Zhou Hong , Cheng Jing Yan , Ren Lu Quan
Published: April 2012

This paper focuses on the influence of processing methods on the cracks’ number and form of bionic units on the vermicular cast iron. The results show that there have already been cracks on the bionic units’ surface, and the crack number increases with the thermal cycles. The crack’s form on bionic units processed in air is tree-like structure, and that of bionic units processed in water is network structure. The twice laser process and the electro-pulsing treatment can effectively reduce the crack number of the bionic units processed in water, without changing the form.
Force Performance Research for the Interior Joint of New Light-Weight Portal Rigid Frame
Authors: Huang Zhi , Jiang Li Zhong , Zhou Wang Bao
Published: April 2012

The portal frame is one kind of the common structural styles in the light steel structure. And the portal frame is designed by tapered members, which can be suitable for the variety of the bending moment diagram. This paper introduces the new structure dividing the middle column into two parts on the top of the middle column and analysis the frame with SAP2000. The parameters are investigated such as the hinge joint and firm joint at the bottom of the column and also the parameter of the science of geometry, which influence the load-carrying behavior of the portal frame. The analysis gives that it’s avail for the frame if the angle of the dividing is thirty. Besides, some corresponding design proposal is obtained according to the analysis of the internal force.
Low Voltage Ride through (LVRT) Control of Double-Fed Wind-Driven Generator
Authors: Zheng Jian Hong , Li Jie Feng , Gao Yu Zhi
Published: April 2012

With the rapid development of the wind power, it is no longer an isolated power system and gradually incorporated in the local power grid. However, as the increasing proportion of the installed wind power capacity in the power grid, the affection of the wind turbine to the region power system is getting heavier, which inevitably bring some new problems to the power system. The low voltage ride through (LVRT) is the direct embodiment of the power quality. In this paper, we fist analyze the impact of the voltage drop on the double-fed wind turbine. Then, a LVRT control method is proposed based on hardware realization. The detailed explanation of the proposed control method is given at last.
Study of Remote Elevator Monitoring Fault Detection System
Authors: Liu Jian , Fan Dong Sheng , Wu Yue , Fu Guo Jiang , Liu Mei Ju
Published: April 2012

Remote Elevator Monitoring (REM) is an important means to ensure elevator secure, reliable working. In this paper, an elevator remote monitoring control scheme is proposed based on multi-threaded technology. Due to all threads in the multi-threaded technology may visit the same overall situation object and the shared resource, center system communicates with embedded terminal is achieved by the method. The remote elevator monitoring system has been designed based on the multi-threaded technology; the main thread interface function is realized by monitor center software, other management operations are also executed in the system. The test results show that the multi-threaded technology applies to the monitoring system, which enhances the system efficiency and security.
Research of the Distance Calculation Algorithm Based on RSSI
Authors: Chen Ke Shan , Xu Zhi Hong , Gong Lin Yang
Published: April 2012

In this paper, we present an algorithm about distance calculation based on RSSI of RF. To calculate value of RSSI according to the classic model of signal attenuation, Radio propagation path loss model and formula of received signal strength, establish the relationship chart between the distance and RSSI value. And through the wireless module CC2430 of ETC system for real-time data collection. Compared with the theoretical data and the measured data. Do the correction through calibration model. Resulting more perfect algorithm about distance calculation.
Theory Analysis of Three-Component Induction Resistivity Log
Authors: Luo Shui Liang , Li Lin Xiang , Li Ming , Ma Qing Bo , He Bao Qing
Published: April 2012

This paper shows enumerated electrical field is divided into primary field and secondary field according to two Maxwell circuitation equations combined with fact of induction resistivity log, and the primary field can be solved by analytic geometry method, the secondary field can be solved by finite difference Crisscross grid method. Conductivity selection of primary field and secondary field computation formula of three-component induction resistivity log is developed based on finite difference crisscross grid method in this paper.
Photodecomposition of Methylene Blue by the S, Al Doped TiO2 Mesoporous Materials
Authors: Su Yan , Liu Shao You , Tang Wen Hua
Published: April 2012

Mesoporous sulfur, aluminium doped TiO2 materials (S-Al-TiO2, S-TiO2, Al-TiO2) have been synthesized by solid-state reaction route. The textural properties of the samples are monitored by the X-ray diffraction (XRD), Scanning electron micrography (SEM), Fourier transform infrared spectroscopy (FT-IR), ultraviolet visible light spectroscopy (UV-Vis) and N2-physisorption. Moreover, compared with the pure TiO2, the photodecomposition properties of methylene blue (MB) irradiated with ultraviolet and visible light are presented on the doped TiO2 materials. It is shown that TiO2 doped by sulfur and /or aluminium are mesoporous materials, and the S and Al enter into the crystal lattice of TiO2. At 298K, the rule of pseudo-first-order reaction and excellent visible light catalytic activity are obtained in the photodecomposition of MB on the S-Al-TiO2, S-TiO2, Al-TiO2 and pure TiO2 materials. Interestingly, the reaction rate constant of MB on the S-Al-TiO2 meso- porous nanomaterial is 11.40 times irradiated with the ultraviolet than that with visible light irradiation. But there is 1.42 times corresponding to the pure TiO2. Within 50 min, ultraviolet degradation rate of MB over the S-Al-TiO2 is 98.5%.
Self-Piercing Riveting Process Simulation of Joining Aluminium Alloy Sheets
Authors: Wang Bin , Zhang Hong Yan , Dong Fang Fei , Zhu Tian Yu
Published: April 2012

In this study, a numerical model was built to simulate the self-piercing riveting (SPR) process using commercial LS-DYNA ﬁnite element code. The difficulties in numerical simulation of the SPR process, such as large deformation and fracture, were resolved by the use of an explicit solution process combined with the r-adaptive meshing method. The model was applied to joining two sheets of 6061 aluminium alloy. The effects of die geometry, rivet material properties and the adaptive step size in numerical calculation were studied, using 6061 aluminum sheets as a model system. The simulation agrees well with the experimental results in terms of geometric characterisitcs of the cross-sections of the joints formed.
Effect of Liquid Structural Transition on the Morphology of Solid/Liquid Interface during the Unsteady-State Unidirectional Solidification
Authors: Ding Guo Hua , Li Ming
Published: April 2012

The temperature-induced liquid-liquid structural transition has been observed and testified in different kinds of alloys. The effect of liquid-liquid transition on the morphology of solid/liquid interface was investigated by means of the unsteady-state unidirectional solidification. The results showed that the interface instability of Sn-1wt.%Pb was developed after the liquid structural change, which suggested that the solute distribution coefficient decreased due to the structural change of liquid Sn-1wt.%Pb and the solute on the frontier of solid/liquid interface enriched.
FEA Simulation of the Influence of Cutting Parameters on Serrated Chip Formation in Machining Titanium Alloy Ti-6Al-4V
Authors: Jiang Zeng Hui , Feng Ji Lu , Deng Xiao Ye
Published: April 2012

A finite element model of a two dimensional orthogonal cutting process is developed. The simulation uses standard finite software is able to solve complex thermo-mechanical problems. A thermo-visco-plastic model for the machined material and a rigid cutting tool were assumed. One of the main characteristic of titanium alloy is serrated shape for a wide range of cutting conditions. In order to understand the influence of cutting parameters on the chip formation when machining titanium alloy Ti-6Al-4V. The influence of the cutting speed,the cutting depth and the feed on the chip shape giving rise to segmented chips by strain localisation is respectively discussed.
Research on Cutting-Tools Whole Life Cycle Management System
Authors: Wang Yong Zhong , Zhang Yu Hua , Zheng Min Li
Published: April 2012

Considering the problems of the current cutting tools, such as wide varieties, low management efficiency, high cost and selection difficulty, this paper builds a cutting tools total life cycle management system model, by using the total life cycle management concept the total life cycle management of the milling cutters from purchasing to the use and discarding is realized. In this paper, through researching on cutters selection law, rules for milling cutters selection is made and intelligent cutters selection system is established with rule reasoning method.
Study of 1Cr18Ni9Ti Material Properties in Cutting Process
Authors: Li Zhe , Jiang Bin , Xu Hong Xu , Zhou Ming Jia
Published: April 2012

This paper obtained the mechanical properties of 1Cr18Ni9Ti by the static tensile test, got the corresponding relationship between the 1Cr18Ni9Ti coefficient of linear expansion, thermal conductivity and temperature changes, and simulated the process of 1Cr18Ni9Ti cutting with the finite element simulation software, then analysised the reason why the deviation of the finite element simulation results and measured data increased with the cutting speed improved. These studies provide some important references for the finite element simulation and revealing the tool wear and breakage mechanism.
Prediction of the Cutting Depth of Abrasive Suspension Jet Using a BP Artificial Neural Network
Authors: Liu Xiao Jian , Fan Qian Qian , Feng Yan Xia
Published: April 2012

Abrasive suspension jet is a new embranchment of abrasive jet. In the cutting process of this jet, the suspension concentration is constant, so the cutting quality is more stable. In this paper, a prediction model based on a back-propagation (BP) artificial neural network is presented for predicting the cutting depth generated by abrasive suspension jet. In the application of the BP neural network, the mean error of the output in the model training is 0.01, the relatively discrepancy is below 8.70%. The modeling method based on the BP neural network is much more convenient and exact compared with traditional methods, and can always achieve a much better prediction effect. It is verified with experiments to be reasonable and feasible, and it is the better foundation for the future study of abrasive suspension jet.
Powder Mixed near Dry Electrical Discharge Machining
Authors: Bai Xue , Zhang Qin He , Li Tian Tian , Zhang Jian Hua
Published: April 2012

Powder mixed near dry electrical discharge machining (PMND-EDM), which uses gas-liquid-powder mixture as three phase dielectric medium to remove materials, is proposed. Compared with dry EDM, much higher material removal rate (MRR) is achieved in PMND-EDM. The mechanism of PMND-EDM is analyzed and reasons for its MRR improvement are illustrated. Comparative experiment is done in compressed air and three phase dielectric medium, respectively. MRR is calculated. And discharge voltage waveforms are obtained by oscilloscope. It is shown that three phase dielectric medium can improve MRR effectively.
High Performance in EDM Machining of AISI D2 Hardened Steel
Authors: Hamid Faizul Ezmat Abdul , Lajis Mohd Amri
Published: April 2012

In this paper an attempt has been made to investigate the performance of an electrode made through powder metallurgy (PM) of copper tungsten during electrical discharge machining (EDM). Experimental results are presented on electrical discharge machining of AISI D2 hardened steel in kerosene with a copper tungsten (Cu35% - W65%) tool electrode made through PM method with a constant duty factor of 80%. In term of high performance EDM process, higher peak current (>20A) and pulse duration (>400µs) with a high machining efficiency were used. Experimental results have shown that machining at a peak current of 40A and pulse duration of 400µs yields the highest material removal rate (MRR) whereas machining at a peak current of 20A and pulse duration of 400µs yields the lowest tool wear rate (TWR). The lowest surface roughness appears at the lowest material removal rate which is at a peak current of 20A and pulse duration of 600µs. The optimum machining performance can be performed by the combination of pulse duration and peak current at 600µs and 40A respectively.
Grinding Force of Ultrasonic Vibration Assisted Grinding Combined with EDM
Authors: Yan Peng , Zhang Jian Hua , Su Guo Sheng
Published: April 2012

In the ultrasonic vibration assisted grinding and EDM, grinding and pulse discharge machining are favorable conditions for each other, can significantly improve the processing efficiency by adjusting the processing parameters, and get high-quality machined surface. The grinding force is an important parameter in characterizing the grinding process, which is the g the main object of study in grinding process. The interaction of ultrasonic vibration, grinding and EDM is investigated. From the view of material removal volume, the volume of removal by EMD is calculated. Then the volume by grinding is gotten. The grinding force model of combined machining is established. The influence machining parameters on grinding force is studied, which is helpful for the detection and control of grinding force.
Study on Experiment Device of Abrasive Water Jet Micro-Turning
Authors: Hou Rong Guo , Huang Chuan Zhen , Zhu Hong Tao , Wang Jun
Published: April 2012

An abrasive water jet micro-turning experiment device is designed to solve the problem for micromachining the revolving parts. This device is composed of the machine body, hydraulic system, collection devices and control equipment etc. This paper emphasizes on the structure design of the moving parts of the abrasive water jet turning process, clamp, lathe bed, abrasive water jet injecting system and collection system. The turning spindle system and feed drive mechanism are designed, and the strength, stiffness and precision of the ball screw transmission mechanism are calculated and checked to meet the needs of the abrasive water jet micro-turning experiments.
Finite Element Analysis for Ti-6Al-4V in Ultrasonic-Vibration-Assisted Micro-Cutting
Authors: Lu Dong , Huang Hong Fu , Wu Yong Bo , Yang Ming Ming
Published: April 2012

Ultrasonic-vibration-assisted micro-cutting of Ti-6Al-4V was simulated by finite element analysis software ADVANTEDGE. During the micro-cutting of Ti-6Al-4V the cutting forces were compared between conventional and ultrasonic-vibration-assisted method. In the ultrasonic-vibration-assisted micro-cutting process different frequency and amplitude were applied on the cutting tool. The influences of frequency and amplitude were analyzed. The cutting temperature increases with the increase of the amplitude, and the cutting temperature decreases with the increase of frequency. By using the simulation method the appropriate amplitude and frequency data can be obtained.
Molecular Dynamics Simulation of the Ablation Process in Ultrashort Pulsed Laser Machining of Polycrystalline Diamond
Authors: Li Zeng Qiang , Wang Jun , Wu Qi
Published: April 2012

The mechanism of ultrashort pulsed laser ablation of polycrystalline diamond (PCD) is investigated using molecular dynamics simulation. The simulation model provides a detailed atomic-level description of the laser energy deposition to PCD specimens and is verified by an experiment using 300 fs laser irradiation of a PCD sample. It is found that grain boundaries play an important role in the laser ablation. Melting starts from the grain boundaries since the atoms in these regions have higher potential energy and are melted more easily than the perfect diamond. Non-homogeneous melting then takes place at these places, and the inner crystal grains melt more easily in liquid surroundings presented by the melting grain boundaries. Moreover, the interplay of the two processes, photomechanical spallation and evaporation, are found to account for material removal in ultrashort pulsed laser ablation of PCD.
Experimental Study of Cutting Forces in Micro End-Milling
Authors: Jing Xiu Bing , Li Huai Zhong , Wang Jun , Liow Jong Leng
Published: April 2012

Micro-end-milling is an efficient and economical manufacturing operation that is capable of accurately producing high aspect ratio features and parts. It is important to study the cutting forces in micro-milling for the planning and control of the process. This paper presents an experimental study of the cutting forces in micro-end-milling of a 6160 aluminum alloy. The measured cutting forces are presented and discussed for different cutting conditions, such as various feeds per tooth, cutter diameters, and cutting speeds. It is found that the peak cutting forces increase with increasing cutting speed and feed rate. The effects of tool runout on the cutting forces were also analyzed based on the experimental results, from which the influences of feed rate and cutting speed are found to be obvious.
Research on Surface Topography and Tool Wear in Micro-Turn-Milling of Micro-Screw
Authors: Jin Cheng Zhe , Fang Rui
Published: April 2012

Turn-milling technology can replace turning with milling to high speed machining rotationally body parts. So, micro-turn-milling has superiority on the productivity and the quality of workpieces, and is more suitable to machine micro-shaft parts and desirable miniature parts based on the turn-milling technology. Micro-turn-milling can be used for the machining of micro-parts in its hardened state. In this paper, the influence of cutting parameters on surface topography and tool wear is presented in micro-turn-milling of micro-screw. The interaction effect of parameters to surface topography and tool wear is investigated. The results show that micro-turn-milling technology has its peculiar advantages in realizing high-speed cutting and ensuring machining quality.
Influence of Different Shapes to the Dynamic Mechanical Properties of Bioprosthetic Heart Valve
Authors: Huang Xu , Yuan Quan , Zhang Cheng Rui , Ma Hai Bo , Ye Xin
Published: April 2012

The stress with different shapes of the same thickness of the leaflet under the same load is analysed and compared by us. We create the spherical and ellipsoidal curved surface in accordance with geometrical features. The experimental results of the finite element analysis show that stress distribution of the different bioprosthetic heart valve leaflets with the same thickness is different. This work is very helpful to manufacture reasonable shaped valvular leaflets and to prolong the lifetime of the bioprosthetic heart valve.
Planning and Simulation Study of Stone Countertop Automatic Production Line
Authors: Kong Yan Jie , Zhang Jin Sheng , Huang Bo , Wang Zhi
Published: April 2012

Current stone countertop production process is worn the following problems: long handling distance, long handling time, loose process cohesion, low balance rate, etc. In order to solve these problems, an automatic production line is proposed. In the production line, roller conveyer is used as the logistic system. The selected CNC equipment adopts an open structure and an oblique base. The equipments are arranged into a U-shape line combined with unit layout. In order to increase the flexibility of the production line, the whole production line is divided into two level modules. According to the design rules of the automatic production line, two examples are planned and are simulated based on EM-Plant. The simulation results show that, compared with the current production process, the automatic production line has the following advantages: the transit distance is shortened more than half, the transit time is reduced to about 1/7, and the balance rate increases by 20%, the output is nearly doubled, while the number of workers does not increase.
Study on Universal Open-Architecture CNC Development Platform Based on Clipper
Authors: Chen Dong , Chang De Gong
Published: April 2012

An universal open-architecture CNC development platform for further designing all kind of numerical control devices is study, which is beneficial to making considerable reduction of development cycle and cost. The platform adopts IPC+Clipper construction to achieve the open-architecture of hardware, adopts modular programming technique to implement the open software according to user requirement. The control system consists of closed outer position loop and closed inner speed loop.As a result, the combination of position loop and speed loop achieve high precise and good stability of the motion control.
Surgery Robot for Implantation of Intracranial Electrodes
Authors: Zhou Jun , Li Shou Lei , Ullah Saif , Zhang Yun Feng , Liu Pei Chao , Li Xiao Ping
Published: April 2012

Deep brain stimulation (DBS) is increasingly used in clinical treatment for various neurological disorders, particularly for movement disorders such as Parkinsons disease. The more the accuracy of locating the cerebral target of these diseases is, the more cure effect is, the accuracy of locating the cerebral target depends on the all surgery system. Although there have many surgery systems, for more accuracy of those locating target based on CT images, it need to develop a new kind of robotic surgery system. Some requirements of this robotic system are present in this paper, such as the movement degrees of freedom and its dimension error. Each functional sub-system of this robotic surgery system with some constraint condition is also analyzed. When all of those sytem are implemented with more precise location, predictability, reliability, and robustness sufficient for trial evaluation in stereotactic biopsy of brain lesions, the robotic surgery system can be used in clinical application.
Numerical Simulation on the Sintering Process of Nanocomposite Ceramic Tool Materials
Authors: Cheng Hong Mei , Huang Chuan Zhen , Zou Bin , Zhu Hong Tao , Liu Han Lian , Wang Jun
Published: April 2012

A Monte Carlo Potts model for the sintering process of two-phase nanocomposite ceramic tool materials is proposed. The grain growth, pore diffusion and vacancy annihilation at grain boundaries are simulated in the model. Simulation results are presented and discussed. It is found that pore and nanophase can pin the ceramic matrix and decrease the growth rate of matrix grain during the microstructure evolution. The addition of nanoparticles is not only beneficial to the refinement of ceramic matrix grain and the formation of intra/intergranular-type microstructure but also advantageous to the densification of ceramic materials.
Simulation of Fabrication for Al2O3 Ceramic Tool Materials
Authors: Fang Bin , Huang Chuan Zhen , Zhu Hong Tao , Xu Chong Hai
Published: April 2012

The new Monte Carlo Potts model that couples with fabrication parameters and considers pores and additives has been developed in order to simulate the fabrication of single-phase ceramics tool materials. The microstructure evolution for single-phase Al2O3 ceramic tool materials is simulated with the different technology parameters. At the same time, the single-phase Al2O3 ceramic tool materials are fabricated with the corresponding technology parameters. The errors of grain size between the simulated and the experimental is 12.1 and18.2%.
Fluid Characteristics of Material Flow in High Speed Metal Cutting Process
Authors: Zhang K.G. , Liu Zhan Qiang
Published: April 2012

In high speed metal cutting momentum would be large and the strain rate can be exceedingly high, the viscosity of material must take into account in studying the chip deformation. Model the high speed machining as fluid flow is much better than as solid. A laminar flow method is applied in this paper to analyze the velocity distribution, the pressure distribution, the temperature distribution and the strain rate distribution of high speed metal cutting. Analytical results showed that a speed stagnation point is located at some distance from the tool tip on the tool rake face, on which the maximum value of the pressure occurs, with zero speed; its location influences the life of the tool and the quality of the finished surface. The value of the pressure decrease along the rake face and reaches zero at some point away from the tool tip, which is the point of separation of the chip from the tool; The value of strain rate get a rapid increase from the tool tip to the free surface corner then decreased outwards.
Research on the Tools' Strength in the Condition of Uncommonly Dynamic Heavy-Duty Loads
Authors: Yan Fu Gang , Liu Xian Li , He Geng Huang , Zhang Ji Jun , Yu Zhong Guang
Published: April 2012

ntroducing the machining-ability of the surface of hydrogenated cylindrical shells blank, and the analysis showed that one of the main macroscopic factors which caused the tool to be broken early was forging defect. According to researching on both failure mechanisms and rules of the heavy-duty turning tools fracture, the conclusions that the dynamic load led into the crack then made the tool to be broken could be drawn. Then, the finite element simulation was utilized to analyze the tools working state under dynamic load condition, and the simulation results verified the correctness of the conclusion. For improving production efficiency and providing a reference for the prediction of tool breakage, finally, the critical time model of tool breakage under the condition of dynamic cutting was built, and the measures of preventing tools premature failure were developed.
Experiment Study on Cutter Disrepair Principle and Optimization for Machining Heat-Resistant Steel
Authors: Cheng Yao Nan , Liu Xian Li , Yan Fu Gang , Li Zhen Jia , Wang Xian Zhou
Published: April 2012

In order to find out the cutter disrepair principle and provide a valuable reference for the design, production and use of the heavy-duty hard alloy cutter, have experiment study on machining the heat-resistant steel-the 3Cr-1Mo-1/4Vsteel. First, have impact disrepair experiments with several types of different grooves milling inserts, and find out the difference of the impact disrepair invalidation types among them, and build the impact disrepair life cumulating distribution function mathematic model. Second, based on the adhering disrepair experiments, find out the difference of the adhering disrepair invalidation types, build the quantitative mathematic relation between milling temperature and maximal adhering disrepair depth on rake face of the cutter, and analyze the rule that the milling temperature affects the adhering disrepair. And then, on the basis of the scene machining, have analysis on cutter disrepair phenomenon and mechanism under the joint action of force and heat, so to provide a theoretical basis on how to avoid premature failure of the tool for the actual production process.
Failure Analysis of a Bellows Expansion Joint of Inconel625 Alloy
Authors: Liu Hua Dong , Wang Wei Qiang , Liu Yan
Published: April 2012

A bellows expansion joint of a refinery cracked within a year of use. Analysis was carried out based on the investigation of the working conditions and environments. Through the macroscopic analysis, chemical components analysis, microstructure analysis and SEM analysis, we drew some conclusions. The high-temperature sulfur corrosion led to the failure directly, while the direct reason was the extra load applied on the joint which was caused by the unreasonable support structure. Preventive measures were proposed at last.
Review of Deep Brain Stimulation Micro-Electrodes
Authors: Zhou Jun , Liu Pei Chao , Ullah Saif , Zhang Yun Feng , Li Shou Lei , Li Xiao Ping
Published: April 2012

Currently, deep brain stimulation (DBS) is one of the most effective surgical treatments of treating serious stubborn resistance movement disorders (such as Parkinson's disease, essential tremor and dystonia, etc.). The nerve probe has been greatly favored by the authorities and scientists with the respect to the role it acted as the main brain stimulation tool. This article mainly introduces the materials of brain stimulated micro-electrode, the matched specifications and the evaluation on the compound functions in the developing course. The application prosperity and its development trendy will also be included with the intention to help people gain more systematic acknowledgement on the electrodes for deep brain stimulation.
Influence of Cobalt Additive on Mechanical Properties and Residual Stress of Al2O3-TiC Ceramic Cutting Tool Material
Authors: Yin Zeng Bin , Huang Chuan Zhen , Zou Bin , Liu Han Lian , Zhu Hong Tao , Wang Jun
Published: April 2012

Cobalt additive was added into the Al2O3-TiC composite to improve the mechanical properties. The microstructure and fracture mode of composite tool materials Al2O3-TiC and Al2O3-TiC-Co were investigated, emphasizing on the difference of thermal residual stress distribution with added cobalt. The interfacial thermal stress and the stress distribution in each phase were worked out according to thermoelasticity theory. The results demonstrated that cobalt could strengthen the interfacial bonding strength of ceramic grains and influence the residual stress distribution in Al2O3 matrix, which change the fracture mode and lead to the flexural and irregular crack propagation path.
Study on the In Situ Fabricated Titanium Nitride-Based Ceramic Cutting Tool Materials Reinforced by Titanium Diboride
Authors: Shi Qiang , Liu Han Lian , Huang Chuan Zhen , Zou Bin
Published: April 2012

The titanium diboride reinforced titanium nitride-based ceramic cutting tool composite materials were fabricated by a new technology namely in situ synthesis followed by hot-pressed sintering. The experimental results showed that the highest density and the best mechanical properties of the composite material were obtained when the content of Ni was 5wt%. X-ray diffraction (XRD) was used to identify the phases of the composite. Microstructures of the composite were observed by means of scanning electron microscope (SEM). It is concluded that the sintered material was pure, no harmful reaction products was found; with the increase of Ni content, the proportion of short rod-like TiB2 increased, fracture toughness of the composite materials were improved because lots of TiB2 were pulled out; bridging phenomenon of short rod-like particles and metal particles were observed in the crack propagating process. The main toughening mechanisms of the composites were deflection and bridging of the crack as well as grains pulling out.
A Virtual Crankshaft Dynamic Balance Measuring System Based on VB
Authors: Wang Xin Wei , Mu Li
Published: April 2012

A crankshaft dynamic balance system designed based on VB is proposed in this thesis. The imbalance can be measured by using computing software and signal processing technology. The development principle, method, hardware and software system are all introduced. The modular design is used in software system. The touch-screen device is used to realize the data display, storage and analysis. And the imbalance mass and position can be displayed on the virtual instrument interface. Real-time monitoring and accurate information can be completed by the system. The experiment result shows this system is easy in operating, high in capability/price ratio and high in balancing precision. It can meet the producing demands and has good market prospects.
Accuracy Analysis of Stewart Parallel Manipulator Based on Uniform Experiment Design
Authors: Li Jian Guang , Ding Jian , Jing Huai Jing , Yao Ying Xue
Published: April 2012

Accuracy of the Stewart parallel manipulator is utmost important in assembly quality control procedures, and it's also difficult to demonstrate the inner relations quantitatively between errors of pose and of actuators. A novel methodology is proposed in this paper. Firstly the experiment area planning approach is proposed according to the pose and strut symmetries of the manipulator, and the uniform experiment design is conducted to investigate indexes of accuracy sensitivity. The regression equations are established to analyze the significance of various factors according to experiment results.
Research of Turbine Pump Shaft Effective Pre-Tightening Force Transmission Influencing Factors
Authors: Zhou Liang , Jiang Yun Xiang , Lang Yue Dong , Xie Da Gang , Jin Guang Yuan
Published: April 2012

Abnormal vibration was found in a rocket engine test, to guarantee the stability of the rotor when its working, in this paper, by studying the turbine assembly process and pump assembly process, research of the factors such as correlation among the assembly torque, the pre-tightening force, part parameters and assembly parameters etc was applied. By studying the assembly process of turbine pump shaft, analyzing the of the role of the turbine shaft Parts parameters in the assembly process, by selecting the shaft parts and assembly experiments, theoretical basis and data preparation are provided to improve the quality of the turbopump assembly.
Calculation of Compressor Characteristics Based on Elman Neural Network
Authors: Feng Yong Ming , Zhao Dong Lai , Zhang Peng Qi
Published: April 2012

A calculation of an axial compressor characteristics is made based on Elman neural network. The experimental data provided by manufacturers are used for the neural network training.To establish the function model to obtain the pressure ratio and efficiency respectively. The result show that Elman neural network both have a good precision for prediction of interpolation and extrapolation.
Study of Crystallization Kinetics of TeO2-Na2O-MgO Glass Using Ozawa Method: Influence of Europium
Authors: Sazali Ezza Syuhada , Sahar M. Rahim , Mat Jan Nur Amanina , Hamzah Khaidzir , Arifin Ramli
Published: April 2012

. The study of the crystallization kinetics of rare-earth doped glass stimulated much interest especially for crystallization process. In this work transparent Eu2O3 doped glasses with composition TeO2 - Na2O – MgO were prepared using conventional melt-quenching technique. The amorphous nature of glass was confirmed using X-ray diffraction method. The influence of Eu3+ content on the crystallization kinetics of the glass such as activation energy (Ea) was thoroughly evaluated under non-isothermal conditions using DTA. The crystallization kinetic at different heating rate from 5 °C min-1 to 25 °C min-1 at different crystallization temperature (Tp) were examined and verified using Ozawa method. The result showed that the activation energy (Ea) was decreased with the increasing of the dopant concentration from 319.8 eV to 93.5 eV.
Electrophoretic Deposition of Biphasic Calcium Phosphate (BCP) Coatings on 316L Stainless Steel at Room Temperature
Authors: Abudalazez Asam M.A. , Kasim Shah Rizal , Ariffin Azlan B. , Ahmad Zainal Arifin
Published: April 2012

Electrophoretically deposition of Biphasic calcium phosphate on 25 × 10 × 1.2 mm (length, width, and thickness) 316L stainless steel plates using ethanol as dispersing medium; It was achieved on the cathode with constant voltages 20, 30, 50, and 100 V during 20, 30, 60, 90 and 120 seconds, respectively. After deposition, the samples were dried at room temperature for 24 hours and deposition weight and thickness of the coatings were measured. The coated samples were sintered in a tube furnace at 800 °C for 1 h in an argon atmosphere. After the sintering, the surface morphology and structure and phase composition of the samples were studied by a scanning electron microscope (SEM), energy dispersive spectrometry (EDX) and phase purity of the coating material by X-ray diffraction.