bluuebunny/crossref_metadata_2025 huggingface dataset:
Microscopic Examination of Primary Shear Zone in High Speed Machining of Hardened High Strength Steel
Authors: Duan Chun Zheng , Wang Min Jie , Dou Tao
Published: March 2010

The microstructure observation and microhardness measurement were performed on the adiabatic shear bands in primary shear zone in the serrated chips formed during high speed machining of two tempering hardness of hardened high strength steel under different cutting speeds by optical microscope, SEM, TEM and microhardness tester. The investigation results show that two types of adiabatic shear bands are formed as cutting speed increases. One is deformed band with heavy elongated microstructures generated under lower cutting speed, another is transformed band with fine grains under higher cutting speed. The increase of the cutting speed little influences on the microhardness in the transformed bands, and the microhardness in deformed band results from strain hardening, whereas transformation hardening leads to very high microhardness in transformed band.
Failure Mechanisms of Carbide Tool in High Speed Milling of Inconel 718
Authors: Song Xin Yu , Zhao Jun
Published: March 2010

TiAlN/TiN multilayer PVD coated carbide is one of the dominant tool materials for the milling applications of Inconel 718 due to its high hardness, high wear resistance, and high thermal stability. In this paper a study was undertaken to investigate the wear of TiAlN/TiN multilayer PVD-coated carbide tools during milling of nickel-based superalloy Inconel 718 at high speeds. The wear patterns and wear mechanisms were analyzed. Results show that the dominant wear patterns were coating delamination, thermal crack, micro-chipping，chatter marks and breakage. When the cutting depth was 1mm, the coated tool was predominantly subjected to adhesion and diffusion wear throughout the duration of cutting. Adhesive wear on one hand accelerated the extension of thermal crack, on the other hand promoted the diffusion wear. When the cutting depth was 3mm, the tool life was determined by chatter which could lead to failure of the cutting tool in very short time.
Design of an Ultrasonic Vibration Deep-Hole Honing Device
Authors: Zhu Lin , Chen Xin , Li Ji Yun
Published: March 2010

A set of horizontal ultrasonic vibration deep-hole honing device is designed and developed, for honing the workpieces which diameter are between 80 to 100 mm. The honing experiments in the titanium alloy are carried out with the device, and the results indicate that the ultrasonic vibration honing can improve working surface quality.
SSA Based Decomposition of Tool Position Trajectory for Diamond Turning of Freeform Optical Surfaces
Authors: Zhou Xiao Qin , Duan Ning Hua , Xu Peng Zi , Lin Chao , Liu Qiang
Published: March 2010

The radial spiral feed of the tool and the tool nose radius compensation are taken into consideration for the tool position trajectory (TPT) generation in diamond turning of freeform optical surfaces. Using the coarse sampling and the fine interpolation, a novel approach based on singular spectrum analysis (SSA) is presented to decompose the generated TPT into a slowly varying trend and a quickly varying quasi-periodic oscillation. The numerical experiments of the TPT decomposition of toroidal surfaces have been carried out. The results verify that the proposed approach is very effective for the TPT decomposition.
Research on Surface Roughness Prediction Model for High-Speed Milling Inclined Plane of Hardened Steel
Authors: Chen Yuan Ling , Zhang Bao Lei , Long Wei Ren , Xu Hua
Published: March 2010

As the factors influencing the workpiece surface roughness is complexity and uncertainty, according to orthogonal experimental results, the paper established Empirical regression prediction model and generalized regression neural networks (GRNN) for prediction of surface roughness when machining inclined plane of hardened steel in high speed , moreover, compared their prediction errors. The results show that GRNN model has better prediction accuracy than empirical regression prediction model and can be better used to control the surface roughness dynamically.
Machinability Prediction of Workpiece Material with a Diagraph Method
Authors: Xu Lin Hong , Jiang Zheng Feng , Ståhl Jan Eric
Published: March 2010

This work presents a diagraph method for the description and predication of the potential machinability of work materials. In the method, a radar chart with five axes was used to examine the machinability of different work materials and each axis representing a behavior or property, i.e. abrasiveness or hardness of workpiece material by grading the 5 different machinability properties. Such charts are seen to be helpful in the setup work to machine the new materials or unknown materials when choosing suitable tool properties and the cutting data suitable for the new material machining.
An Investigation on the Heat Partitioning in Grind-Hardening
Authors: Zhang Jian Hua , Zhang Xiao Jun , Yu Guo Ying , Gu Mei Lin , Ge Pei Qi
Published: March 2010

The heat partitioning to workpiece is an important parameter, which affects the grind-hardening technology. In this paper, the heat sources positions, which are around the grain, are analyzed. Ignoring the heat source produced in chip-grain interface, the heat partition model is established based on heat source position produced in grain-workpiece interface and the chip-workpiece interface. The heat partition is validated by using of finite element method and the experimental method. The results indicate the heat partition model can be used in grind-hardening temperature calculation.
Effects of Grinding Wheel Vibration on Surface Quality of Axisymmetric Aspheric Lens
Authors: Bi Guo , Guo Yin Biao , Pan Kun , Jiang Chen
Published: March 2010

Minute vibration of grinding wheel greatly restricts machining accuracy of axisymmetric aspheric surface in precision grinding. This paper is dedicated to analysis micro-topography of grinding surface under grinding wheel vibration. The relative motion track of wheel to ideal lens surface and the interference of them are involved to study the effects of grinding wheel vibration on surface quality. For different operation parameters, the processed surface presents various micro-topography, and the restriction extent of vibration to surface quality is also different. Vibration waveform in the region near lens center is smoothed greatly by the interference of wheel and the processed surface. Therefore, surface quality gets some improvement from edge to center for axisymmetric aspheric lens. Experiment results verified the validity of the theoretical analysis.
A Mathematical Model of EEBP for HSM Surface Quality Prediction
Authors: Li Yue En , Zhao Jun , Wang W. , Cao Q.Y.
Published: March 2010

The main purpose of this study was to construct a relationship between the cutting parameters and the machined surface on high speed milling operation. An optimization algorithm using an Exponential Equation and BP method (EEBP) is then applied to determine optimal cutting parameters. For using the method, once the material removal volumes for machined parts of the high speed milling operations are given, the surface quality could be predicted. The final result we choose the surface roughness prediction as an example of H13 dies steel HSM in this paper, it presents that the method is efficient and feasible.
Preparation of Maghemite-Silica Nanocomposites Using Sol-Gel Technique
Authors: Ang Bee Chin , Yaacob Iskandar Idris
Published: March 2010

Superparamagnetic maghemite nanoparticles were successfully produced using Massart’s procedure. Nanocomposites consisting of the synthesized maghemite nanoparticles and silica were produced by dispersing the as-synthesized maghemite nanoparticles into the silica xerogel, which was prepared by sol-gel technique. The system was then heated for 3 days at 140oC. A variety of weight ratios of Fe2O3/SiO2 was investigated. The nanocomposites were characterized using TGA, XRD, TEM and AGM. TGA thermogram showed one significant weight loss at around 250oC. It was caused by dehydration and evaporation of solvent from sol-gel process. XRD showed that the dispersed particles were still maghemite. TEM micrographs showed that the maghemite nanoparticles were in spherical shape and they were homogeneously incorporated in the silica matrix. The values of magnetization at 10kOe applied field were in the range of 1.79emu/g to 9.53emu/g depending of the Fe2O3/SiO2 ratio. Reduction of average crystallite size of dispersed maghemite particles was observed after encapsulation process. Increasing weight ratio of Fe2O3/SiO2 caused increase of the average crystallite size of maghemite nanoparticles.
Refinement of Microstructure in Steels through Thermomechanical Processing
Authors: Beladi Hossein , Timokhina Ilana B. , Mukherjee Subatra , Hodgson Peter  D.
Published: March 2010

The refinement of microstructure is the most generally accepted approach to simultaneously improve the strength and toughness in steels. In the current study, the role of dynamic/static phase transformation on the ferrite grain refinement was investigated using different thermomechanical processing routes. A Ni-30Fe austenitic model alloy was also used to investigate the substructure character formed during deformation. It was revealed that the microstructure of steel could further be refined to the nanoscale through both the control of processing route and steel composition design.
Equivalent Continuum Models for the Simulation of Mechanical Properties of Carbon Nanotube by Global-Local Homogenization Method
Authors: Luo Dong Mei , Fu Weng Shen , Yang Hong , Zhou Ying Long
Published: March 2010

In this paper, the global-local homogenization method is applied for two kinds of equivalent continuum models to analyze the effective mechanical properties of single-walled carbon nano tube (CNT). The material and geometric parameters are provided by equating the molecular potential energy of nano-structure material with the strain energy of equivalent continuum tube and equivalent continuum frame. The results show that global-local homogenization method is effective to investigate the mechanical properties of single-walled nano-structure with a reasonable selection for equivalent continuum models (representative volume element RVE). The variations of the effective Young’s modulus with chiral parameters, thickness of models and poisson’s ratio of carbon nanotube are discussed for both zig-zag and armchair configurations. Comparing with the results from other classical methods, the homogenization method with equivalent continuum models can give moderate and stable results.
Development of Ultra-Precision Grinding Process for Aspheric Surface Based on Feed Rate Controlling and Error Compensation Methods
Authors: Yin Shao Hui , Li Hai Feng , Fan Yu Feng , Zhu Yong Jian , Chen Feng Jun
Published: March 2010

In this paper, a new method of improving uniformity of surface roughness through controlling feed rate was proposed. A CNC grinding software based on feed rate controlling and error compensation for aspheric surface was developed. The structure and function of the software system was described. An experimental test for grinding aspheric surface of WC mould was conducted for evaluating the performance of the compensation process by using this developed software. After compensation grinding for several times, form accuracy of PV 126 nm, roughness of Ra 3.4 nm can be obtained.
Fe-Based Micro- and Nanocomposite Coatings Produced by Amorphous Alloy Crystallization Based on Electrospark Deposition
Authors: Zhou Xia , Qu Guo Hui
Published: March 2010

The aim of this paper is to explore the possibility of a novel surface technique for Fe-based amorphous and micro-nano composite coatings. A kind of iron based amorphous and micro/nano-crystalline alloy powder which contains Fe, Ni, Cr, W, Mo, B, Si, C etc. was first prepared by mechanical alloying method. Iron based amorphous alloy coatings were then deposited on nodular cast iron substrate by electro-spark deposition using electrode materials with the ball-milling iron based alloy and SiC mixed powders. Annealing crystallization treatment of the Fe-based amorphous alloy coatings was conducted at last. The microstructure and surface morphology of the coating were analyzed by optical microscopy (OM) and scanning electron microscopy (SEM), the amorphous and crystal configuration were confirmed with an X-ray diffractometer (XRD), the microhardness was measured with a micro-sclerometer. The experimental results show that the Fe-based composite coatings are composed of Fe-based amorphous alloy matrix and dispersion strengthened micro- and nanocrystalline particles. The coatings of about 60 m in thickness are uniform, dense and metallurgically bonded to the substrate with high microhardness of about 880 (HV100, 15 S), implying a much improved wear resistance on surface of cast iron.
Experiment on Nano-Sized Activated Carbon/Zn-MnO2 Electrode Material
Authors: Li Sheng Juan , Wang Shu Lin , Xu Bo , Li Lai Qiang
Published: March 2010

Here Zn-doped MnO2 nano-material was synthesized by sol-gel method and comprised the composite electrode material with activated carbon nano-particles with different pore size distributions by roller vibration milling at room temperature. The microstructure and electrochemical performance of the nano-composite electrode materials were studied by AFM, XRD and electrochemical methods. The activated carbon nanomaterial displays spherical particles with 50nm mean size. Meanwhile the AC nano-particles combined with 10wt.% Zn- MnO2 material possess improved electrochemical property with specific capacitance up to 299 F/g.
Study on Biomedical Resources of Benzene/Alcohol Extractives of Eucalyptus Leaves by GC/MS
Authors: Peng Wan Xi , Wu Feng Juan , Wu Yi Qiang , Zhang Zhong Feng
Published: March 2010

Eucalyptus leaves have been used as a common traditional herbal medicine for more than 200 years. In order to further utilize Eucalyptus leaves in biomedicine and put forward new ideas for biomedical manufacturing, the biomedical resources of extractives of Eucalyptus dunnii and Eucalyptus grandis leaves were analyzed by GC/MS. The results showed that: 1) The main constituents of benzene/ethanol extractives in E. dunnii leaves were α-amyrin(9.05%), cyclohexyl-15-crown-5-(6.51%), 1,4,7, 10,13,16-hexaoxanonadecane, 18-propyl-(6.09%), vitamin E (5.83%), 1,19-eicosadiene(5.65%), 1,4-dioxane-2,6-dimethanol(5.32%), coumarin-6-ol, 3,4-dihydro -4,4-dimethyl-7-nitro-(4.42%), 2-furancarboxaldehyde, 5-(hydroxymethyl)- (4.21%), benzene, 1,2,3 -trimethoxy-5-methyl(3.45%), etc. 2) The main constituents of benzene/ethanol extractives in E. grandis leaves were (-)-globulol (7.35%), 1,2,3-benzenetriol(7.17%), D-allose(6.37%), 2- furancarboxaldehyde,5-(hydroxymethyl)-(6.33%), N1-(4-hydroxybutyl)-N3-methylguanidine acetate(5.35%), 1,4,7,10,13,16-hexaoxanonade–cane,18-propyl-(3.95%), vitamin E(3.26%), cyclohexyl-15-crown-5-(3.13%), eucalyptol(2.91%), etc. The results of function analyses suggested that the benzene/ethanol extractives of both E. dunnii and E. grandis leaves were abundant in materials of noble natural biomedicines, and also contained constituents which could be developed into top value-added materials of cosmetics and health care.
Effect of Solution Treatments on the Microstructures and Mechanical Properties of Mg-2Zn-0.8Mn-0.5Ca Alloy
Authors: Du Hui , Wei Zun Jie
Published: March 2010

The microstructures, mechanical properties and fracture behaviors of Mg-2Zn-0.8Mn -0.5Ca alloy are studied in different conditions, including as-cast and solution treated conditions, to reveal the effect of solution treatment on the microstructures and mechanical properties. The morphologies of the solution treated alloys show that the Ca2Mg6Zn3 phases disperse uniformly within the α-Mg matrix after heated solution at 415 °C for 48 h. The mechanincal properties are investigated in as-cast and solution treated alloys. For the as-cast alloy, the rupture pattern is intergranular fracture because the Ca2Mg6Zn3 phases mainly distribute at the grain boundaries. After solution treatment, the fracture pattern mainly becomes to transgranular fracture. After solution treatment, the ultimate tensile strength, the yield strength and the elongation are improved by 39.4 %, 32 % and 81.3 %, respectively.
Evaluation of the Surface of PLA/β-TCP Powder Complex Braid
Authors: Lin Jia Horng , Yao Chun Hsu , Chen Yueh Sheng , Yen Ke Chung , Chao Chieh Yu , Lou Ching Wen
Published: March 2010

This paper aims to prepare porous-structured PLA/β-TCP complex braid fabric. Cells fail to attach to PLA due to its hydrophobicity. Usually oiling agent is added to exclude static electricity. As a result, base refinement was applied to remove oil agents in order to observe cell adhesiveness. When PLA braid fabrics were immersed in 1 wt% NaOH for fifteen minutes, there are a maximum amount of cells on the surface. The concentration of NaOH solution matters little to cell coherence. The results of pH test and cytotoxicity test on extracts suggested that β-TCP can balance acidity in PLA and higher the cell’s survival rate.
Dissolution Resistance of Bovine Teeth-Derived Hydroxyapatite
Authors: Seo Dong Seok , Hwang Kyu Hong , Kim Hwan , Lee Jong Kook
Published: March 2010

Dissolving behavior of hydroxyapatite ceramics prepared from bovine teeth (BTHA) was investigated. The bovine teeth were soaked in 0.1 M of NaOH at 80°C for 1 h. After soaking, the teeth were calcined at 800°C for 1 h, and then they were attritor-milled for 24 h. BTHA powder consisted of mainly HA and small amount of MgO. The powders obtained were cold isostatically pressed and sintered at 1200°C with a dwell time of 1 h. Sintered density of BTHA was about 70%. After polishing the surface of sintered specimen, BTHA was immersed in buffered water at 37°C for 3 and 7 days. After immersion period, there is no evidence of dissolution for BTHA at the end of the immersion time. In addition, there is no change of peak intensity in XRD after immersion time. It was found that hydroxyapatite from bovine teeth was more stable than commercial HA in liquid environment.
Sintering and Mechanical Property of Tuna Bone-Derived Hydroxyapatite
Authors: Seo Dong Seok , Kim Yong Gook , Lee Jong Kook
Published: March 2010

Hydroxyapatite (HA) ceramics derived from tuna bone (THA) was prepared and their mechanical property was investigated with immersion in buffered water. Tuna bones were soaked in 0.1 M of NaOH solution at 80°C for 1 h. After soaking, the bones were calcined at 800°C for 1 h to completely remove organic, and then attritor-milled for 24 h. The powders obtained were cold isostatically pressed and sintered at 1300°C with a dwell time of 1 h. Sintered densities of the THA was about 93%. After polishing, the THA were immersed in buffered water at 37 °C for 3 and 7 days. The THA ceramics consisted of HA and small amount of magnesium oxide. Immersion test revealed that there was no clear evidence of dissolution for the THA which sintered at high temperatures. Vickers hardness test showed that the hardness value of THA ceramics was not changed with immersion time indicating that dense hydroxyapatite from tuna bone was stable in liquid environment.
Efficient Machining of Artificial Hip Joint Components
Authors: Pramanik Alokesh , Zhang Liang Chi , Chen Yi Qing
Published: March 2010

This paper investigates the effect of tool and workpiece motions on the machining efficiency in the fabrication of hip joint prosthesis. The finite element method was used to characterize the three-dimensional motion of the system, using the uniformity or even distribution of a cutting tool tip trajectory as an efficiency indicator. It was found that a proper combination of the rotational speeds of a cutting tool and a workpiece can improve significantly the efficiency of the machining operation.
Process Parameters Optimization for Green Manufacturing of Laser Cladding Based on Artificial Neural Network
Authors: Niu Zong Wei , Song Kai , Li Zhi Yong , Wang F.F.
Published: March 2010

Laser cladding is a new developed green manufacturing process. The main process parameters include the power of laser beam, the diameter of laser facula, the scan speed and the quantity of powder supply. It’s difficulty to analyse the influence of the process factors to the product quality because the effect mechanism is quiet complicated. Model of Artificial neural network for the optimization of process parameter in laser cladding manufacturing was developed in this paper. And proper process parameters were achieved which can provide guide for the practice production.
The Adaptive Blade Design and Evaluation of Wind Turbine
Authors: Liu Wang Yu , Gong Jia Xing , Liu Xi Feng , Zhang Xin
Published: March 2010

This article explored the design method of the wind turbine blade being of flapping-twist adaptive performance and how to evaluate its feasibility and reliability according to the comprehensive factors. The results indicate that both spar cap and skin with off-axis carbon fiber can achieve the efficient flapping-twist coupling effect. Through overall investigation, the results show that the maximum fiber strains of tensile and compressive go up with increase of the off-axis angle, and the peak inter-laminar shear stress increase more rapidly. While, all of these evaluating indicators should be kept in the reference range for used materials. Moreover, when the off-axis angle increases, the peak Von Mises stress declines. In addition, the impact of natural frequencies on the blade design is proved to be insignificant. Finally, utilizing the medial axis laminates in the blade decoupled area is helpful to strengthen the blade fatigue resistivity.
Adaptive Fuzzy Control of Cutting Temperature Based on Cutting Fluid in High-Speed Machining
Authors: Zhong Wei Wu , Zhao Dong Biao , Wang Xi , Yu Hui
Published: March 2010

Green manufacturing is the theme of manufacturing industry in the 21st century. The environment can be seriously polluted by a large quantity of waste cutting fluid .In manufacturing industry, it’s critical to restrict the quantity of waste cutting fluid poured in the environment in order to assure a green earth. Cutting temperature has a major impact on processing quality. A stable cutting temperature means a high quality process. Cutting temperature is also a comprehensive embodiment of process state. In order to control cutting temperature in an appropriate level, an adaptive fuzzy control system is developed to control the flow of cutting fluid injected to machining tool and workpiece which can not only reduce the consumption of cutting fluid but also ensure process quality. Simulation and experiment results show that this control system can achieve the desired purpose.
Design and Study of Multi-Function Asphalt Mixture Shear Apparatus
Authors: Zhang Tao , Liang Yang , Yao Nan
Published: March 2010

The shear force created by non-uniform loading on the asphalt and concrete surface is the main reason why bridge deck pavement is damaged extensively. Multi-function asphalt mixture shear apparatus is designed for dealing with this problem. After studying the composition of mechanical system and data acquisition system, design and develop the program of the system. During the study, the actual prototype is produced, and used in the asphalt mixture shear experiment. The experimental parameters can help the design of asphalt mixture and the prevention of the damage of asphalt concrete pavement.
The Conjugation of the Hardened and Grinded Worm Gear
Authors: Hu R.L.
Published: March 2010

Research of the new kind of meshing is an important research direction of mechanics and manufacture. At present, we have only few methods. Such as the Oliver first method, the Oliver second method and the F. Litven’s method. This paper presents a new kind of conjugate method. The new method is of great significant both in theory and in practice. In order to save nonferrous metal and to increase the strength of the worm gear, scholars at home and abroad suggested producing the worm gear with steel and iron. In other words, both the surface of worm and worm gear are hardened and grinded. So that it is necessary to probe the new way of conjugation.
Application of Ultrasonic Vibration Shoe Centerless Grinding Technique to Micro-Scale Parts Fabrication
Authors: Fan Yu Feng , Tang Xian Ju , Yin Shao Hui , Zhu Yong Jian
Published: March 2010

The present authors proposed a new centerless grinding technique for the fabrication of microscale pin-shaped parts. The new technique uses an ultrasonic vibration shoe whose structure and dimensions was determined in detail by FEM analysis instead of a regulating wheel as in conventional centerless grinding. The workpiece is supported by the end face of the shoe and the blade, and the rotational motion is controlled by the micro elliptic motion generated on the end face of the shoe. a shoe was made and installed on an existing centerless grinder to perform actual microscale centreless grinding operations involving a tungsten carbide pin-shaped workpiece 0.6 mm in diameter and 15mm in length. The experimental result gave a microscale workpiece 75μm in diameter and 15 mm in length.
Numerical Simulation and Optimization on Casting Technique of HT200 Flywheel
Authors: He Bin Feng , Mi Guo Fa , He Shuang Shuang
Published: March 2010

The Z-CAST software was employed to simulate the casting process of gray cast-iron flywheel. Shrinkage was predicted through analyzing the temperature field and the flow field. According to the simulation results, the gating system was improved to eliminate shrinkage, and the thin, wide ingate was shown that can reduce the shrinkage and increase casting yield.
Experimental Research on the Vibration Characteristics of Flexural Vibration Disk
Authors: Zhu Lin , Li Ji Yun
Published: March 2010

The vibration characteristics of flexural vibration disk in ultrasonic vibration system are studied through experiments. The results show that the resonant frequency of flexural vibration disk reduces with the reducing of its thickness and the resonant frequency increases with the reducing of its diameter. When designing the ultrasonic vibration system, because the transformer horn and the flexural vibration disk are designedly integrated, the defects caused by the way of threaded connection can be avoided. It is found that flexural vibration is dominating in the disk with some reflected ultrasonic through experiments, at the same time, there exist amplifying characteristics in the vibration of the disk and the maximal amplitude can reach 18 μm. The corresponding results provide certain reference value for the structure design of ultrasonic vibration system and the application in ultrasonic vibration deep-hole honing.
Flexible Multibody Simulation Approach in the Analysis of Friction Winder
Authors: Liu Yi , Chen Guo Ding , Li Ji Shun , Xue Yu Jun
Published: March 2010

The main objective of this study was to model and simulate a multi-flexible-body three-dimensional model for researching the Multi – rope Friction Winder system. By introducing the multi-flexible-body dynamics method, a multi-flexible-body virtual prototype of the winder is been builded with the RecurDyn software package. Kinematics and dynamics characteristic date are obtained by computer-aided dynamic simulation of virtual Multi – rope friction winder. The result is in accord with theoretical analysis. The research work will provide a powerful tool and useful method for the design of economic and credible elevator system. The approach can be generalized to analysis other flexible drive fields.
Prediction and Analysis of Forged Workpiece’s Precision in Hydraulic Press Based on BP Neural Network and Genetic Algorithm
Authors: Li Yan Cong , Zhang Lian Hong , Zhang Chun
Published: March 2010

Workpiece’s precision is an important indicator of hydraulic press. In order to accurately predict the accuracy of the part, a method that combined the genetic algorithm and neural network is put out. Design of orthogonal experiment (DOE) is used to determine the input samples of neural network training and testing samples. The output samples are obtained by finite element analysed method (FEA). Through optimizing weights and thresholds of BP neural network using genetic algorithms, prediction model of workpiece’s precision is established. The established predict model overcomes the shortcomings of slow to convergence and easy to fall into the local minimum point of BP neural network model . By comparing the neural network forecast result with FEA ‘s results, it can be seen that the established prediction model has good fitting and generalization ability. So the model can be used to predict the workpiece’s precision.
The Application of MR Fluid Damper to the Vibrating Screen as the Enhance of Screening Efficiency
Authors: Zheng Gui Xia , Huang Yi Jian , Gan Ben
Published: March 2010

Vibrating screens are subject to high levels of acceleration and often impart significant dynamic loads on plant buildings, especially in cases where more than one of these screens are employed in process applications. To avoid premature failure and reduce plant building construction costs in critical cases, a variety of techniques are applied in practice. Most of these require substantially increased system mass, which is undesirable because of cost and static loading. With this work the Magnetorheological (MR) fluids damper was used to alter the parameter of vibrating screen and improve the screening efficiency. The displacement signals of the vibrating screen with MR fluid damper were analyzed by using bispectrum (frequency domain) and time domain methods. It is demonstrated that damping and screening efficiency could be improved by using a MR Fluid damper for changing structural damping ratio. The results show that the vibrating screen has a better quality with improved screening efficiency and decreased vibration of the base frame.
Impact Studies on the Setting Styles of Stiffened Board to the Ultimate Strength of Tubular K-Joints
Authors: Gan Feng Lin , Peng Yuan , Chen Chang Ye
Published: March 2010

This study taking the transmission steel pipe tower in the actual project as research background analyzes the mechanical property of stiffened steel tube K-joint. However, stiffened steel tube K-joint is not in the range of the code for design of steel structures GB50017━2003 of China. The corresponding solid models of finite element including K-joint in code of China and stiffened K-joint in actual project are set up to study the plastic distribution on post pipe and the influence of different setting styles of stiffened board to ultimate bearing capacity of K-joints. It was finally known that the stiffened K-joint has better mechanical property than unstiffened K-joint.
Study on Indexable Inserts for Gear Gasher
Authors: Zhang Jin , Huang Xiao Diao
Published: March 2010

This document explains and demonstrates the gear gasher and the mechanism of the process. It is wildly applied, since the manufacturing precision can reach grade 9 to grade 8. The gear gasher composes indexable inserts, gasher body and bolts. Then the dimensions and the installation between the body and the inserts are specified and optimized, based on the cutting profile and cutting condition. The calculated model’s allowance is more even and total area allowance is smaller than the present’s. It can be used for the gasher fabrication.
Numerical Simulations of the Fluid Flow and Heat Transfer during a Solidification Phase Change of a Polymer in a Die
Authors: Ren Shi Xiong , Dang Sha Sha , Lu Tao , Wang Kui Sheng
Published: March 2010

Three-dimensional models of heat transfer have been established and numerically solved using a commercial software package, Fluent, in order to obtain distributions of temperature, velocity, pressure, and liquid volume fraction of the polymer. The influences of the boundary conditions on the phase change of the polymer and the temperature distribution in the die have been evaluated. The results show that the temperature of the region close to the pelletizing surface is relatively low due to the cooling effect of the cool water, while the temperature deeper inside the die is higher, with a lower temperature gradient, as a result of the heating effect of the hot thermal oil and the polymer. A solidification phase change of the polymer occurs near the polymer outlet due to heat loss from the polymer to the water, while deeper inside the hole the polymer remains fluid without solidification, due to heating by the thermal oil. Numerical simulation provides a reliable method to optimize the design of the die, the choice of metallic material for the die, and the operating conditions of the polymer pelletizing under water.
The Manufacturing Resource Modeling of Multistage Manufacturing System Based on the Capacity Manufacturing Unit
Authors: Dong Qiao Ying , Kan Shu Lin , Gui Yuan Kun , Cai Chun Zhi
Published: March 2010

The manufacturing capacity-oriented manufacturing resource model of multistage manufacturing system was presented to achieve the manufacturing resource sharing among the enterprises. This model abstracted various resources as capacity manufacturing unit to accommodate the manufacturing resource sharing. The manufacturing process extraction and graphical description methods based on resource were put forward, which solved the disjointedness problem between resource model and application through related information integration. This model achieves effective equipment state monitoring, personnel configuration and product man-hour tracking in the enterprise and realizes the manufacturing resource sharing based on manufacturing capacity in networked manufacturing environment, so that to make the capacity of enterprises clear and maximum.
Design and Manufacture of a New Large-Scale Three-Dimensional Geomechanics Model Test System
Authors: Zhu Wei Shen , Li Yong , Yong Min , Zhang Q.B. , Li Shu Cai
Published: March 2010

Geomechanics modeling has played important role in geotechnical engineering. In order to investigate on the stability of underground caverns at great depth, a large-scale geomechanics model test system was designed and manufactured. The system mainly consisted of a steel structural frame and a hydraulic loading control system, which can apply active loading on six sides with a true three-dimensional stress state. Newly developed combinational ball sliding walls were installed on each of the major loading surfaces, which were significantly reduced the friction due to model deformation. The system has apparent technical advantages such as high stiffness, great stability, and flexibility of assembly, and easy adjustment of its dimensions.
Vibration Isolation Study on Coupled Vibration of Load Floor Caused by Iron Ore Pelletizing Machine on it
Authors: Xu Jing Li , Chen Zhi Lei , Jiang Zheng Feng
Published: March 2010

By establishing finite element model of load floor based on the field data, this work evaluated vibration of load floor after isolation measures were taken through effective value of acceleration of vibration. And it demonstrated that the floating floor slab was very useful for vibration isolation for load floor whose buildings have been completed. What’s more, the thesis also provided reference standards for further studies on vibration isolation for load floor caused by large-scale rotating machinery on the floor.
Motion Planning of Tomato Harvesting Manipulators with 7 DOF
Authors: Liang Xi Feng , Wang Yong Wei
Published: March 2010

This work presents a motion planning approach for tomato harvesting manipulators with seven degrees of freedom (7 DOF) based on an optimization technique and alternative method. It is to find optimal joint perturbations during the path planning so that a manipulator reaches a goal from an initial position with high accuracy. The optimization model consists of the objective function defined by the tracking error and the representation of a set of mathematical relationships that describe the kinematic restrictions of the manipulator. In this method, only a forward kinematics is used and the complex mathematics in numerical solutions of an inverse kinematics is avoided to reduce the computation load. Simulation results show that the tomato harvesting manipulator can move the end-effector to the target from an initial position along a specified geometric trajectory in its workspace. Simultaneously, the joint displacements vary smoothly within their limits during tracking. The position absolute error, moving velocity and precision of the end-effector are 0.53mm, 0.18m/s and 3.75% respectively, which fulfill the requirements of tomato picking with well working efficiency.
Determination of Expanding Pressure of Hydraulically Expanded Tube-to-Tubesheet Joint
Authors: Tian Xie , Huang Xiao Ping , Fu Zhi Yong
Published: March 2010

It is very important to determine the expansion pressure or residual contact pressure of tube-to-tubesheet joint. The expansion pressure and the residual contact pressure are affected by the geometry, material mechanical properties of the tube and tubesheet. In the basic theory of calculating the residual contact pressure of tube-to-tubesheet joints, the elastic-perfectly material is assumed. Because of the strain-hardening of the materials, linear strain-hardening or power strain-hardening were adopted in some analyzing models of the hydraulically expanded tube-to-tubesheet joint. In this paper, a general strain-hardening material model is adopted and an analytical model is proposed and validated by finite element analysis results. The elastic-perfectly model, linear strain-hardening model or power strain-hardening can be the special case of the present model.
Numerical Analysis of Grinding Fluid Field in Grinding
Authors: Meng Guang Yao , Tan Ji Wen , Shang Shan Shan , Li Chang He
Published: March 2010

Based on hydrodynamic lubrication theory, a mathematical model of grinding fluid field in flood is sets up in this paper. Hydrodynamic pressure and velocity of grinding fluid are calculated by multigrid method. Additionally, crude model about the coarseness of grinding wheel and workpiece is built on the basis of slick model and solutions are obtained by multigrid method. Solutions of slick model and crude model are compared. Result shows that the solution of slick model is in good agreement with the crude model and verifies the experimental analysis.
The Effect of Isothermal Forging Parameters on the Microstructure and Properties of Ti-5Al-5Mo-5V-1Cr-1Fe Titanium Alloy
Authors: Guo Hong Zhen , Wang Xiao Yan , Zhao Zhao Long , Wang Tao , Yao Ze Kun
Published: March 2010

In this paper the effect of isothermal forging process parameters on the microstructure and the mechanical properties of Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy was researched. The results of the tests indicate that, in the temperature range of 755~905 °C and the deformation degree range of 20~60 %, with the increase of deforming temperature, the volume of primary α-phases decrease, but the globularization extent of the α-phases increases and partial secondary α-phases transform into equiaxed shape. At the temperature of 860 °C, the alloy exhibits excellent strength and plasticity, as the uniform and fine duplex microstructure formed after isothermal forging. When the deformation degree increased from 20% to 60%, primary and secondary α-phases were gradually broken and the recrystallization energy was continually accumulated, which ceaselessly strengthened the properties of the alloy. With the increase of forging times, the globularization extent of decreases, leaving the chain of α-phases, which damages the strength and plasticity of the alloy.
Simulation of Compressive Strength of SiC Foam
Authors: Zhao Long Zhi , Li Na , Zhao Ming Juan , Zhang Jian , Yan Hong
Published: March 2010

A three-dimension finite element simulation for the model of three-dimensional network structure foam was made by ANSYS software in this paper. Influence of magnitude of load, loading position and volume fraction on the compressive strength of SiC foam three-dimensional network structure was investigated. The results show that with the increase of magnitude of load and the decrease of volume fraction, the compressive strength of foam decreases gradually. Non-deformability decreases with the increase of load; moreover, the reduction degree becomes bigger gradually. Compressive strength of SiC foam and volume fraction are nonlinearly dependable.
Simulation of Microstructure Evolution for Two-Phase Ceramic Tool Materials at Different Duration Time
Authors: Fang Bin , Huang Chuan Zhen , Xu Chong Hai , Sun Sheng
Published: March 2010

A computer simulation of the sintering process of two-phase ceramic tool materials has been developed using a two-dimensional hexagon lattice model mapped from the realistic microstructure. The relationship between simulation time and real duration time has been proposed. The mean grain size of simulated microstructure increases with an increase in simulation time, which is consistent with the experimental results.
Research and Improvement on the Rolling Force Model of Plate
Authors: Wang Jun , Jia Chun Li , Zhao Zhong , Jiao Zhi Jie , Wang Jian Ping
Published: March 2010

Rolling force model is the core of all the mathematical models of plate for rolling process, but the accuracy of traditional rolling force model is not high enough in application, so in this study the rolling force model of plate is researched and improved. The effects of different physical conditions on resistance of deformation are decoupled, and the formula acquired is practical. While the composition, Nb is used to calculate residual strain. At the same time, the self-learning method, which is based on the thickness layer is applied. The on-line application results show that the predictive error between force model calculated and measured can be controlled at less than 9% and 80% of the passes can be controlled within 5%.
Simulation and Experimental Investigation of Stiffness of the High Acceleration Linear Feed Drives
Authors: Ma Ping , Liao Cheng Xiang , Chen Zhen Hui , Zhen Gong
Published: March 2010

In high speed machining, the feed drives with high velocity and high acceleration are necessary to make full use of the capacities of the high speed motorized spindles. The linear motor feed drive eliminates any mid- transmitting mechanism, which cause achieved the high acceleration. In this paper, the GD-Ⅲ linear induction motor feed drive is introduced, and its controller is modeled and its stiffness has been investigated with simulation program MATLAB & SIMULINK. The influence of the parameters of the controller on the dynamic performance has also been analyzed. The simulation shows that the positional loop proportional gain kv, velocity proportional gain kp, velocity loop integral time constant Tn and the current loop proportional gain kpi have great influence on the dynamics of the linear motor feed drive. In the end, the simulation is verified by the experimental results.
Coupled Simulation of Plastic Part and Mold Temperatures in the Filling Process of Rapid Heat Cycle Injection Molding
Authors: Liu Ji Tao , Zhao Guo Qun , Guan Yan Jin , Wang Gui Long
Published: March 2010

A fully transient method for the simulation of the coupled plastic part and mold temperature in the filling stage of Rapid Heat Cycle Molding process was presented. Unlike the constant temperature boundary conditions in conventional injection molding simulation methods, the mold temperature was assumed to be variable in the filling process. The mold temperature in the heating process was first simulated. In the filling process, the flow equations were solved only on the cavity domain, while the energy equations were solved in a coupled manner for the cavity and mold domain at the matrix level. The temperature evolution in a two-dimensional filling process with heated mold was simulated. Numerical results showed that the proposed coupled simulation method provides reliable temperature estimations in mold filling process.
Manufacture of a Seal Flange with E-Cross-Section
Authors: Teng Bu Gang , Yuan Shi Jian , Wang Zhong Ren
Published: March 2010

A new technology for manufacturing large sealing flange is presented. It involves bending combined with welding and finishing machining at the construction site. The innovation in this method is that the preliminary machining of the section, using a heavy-duty vertical lathe, is replaced by precision bending. Therefore large diameter flange can be manufactured at very low cost. Bending of a specimen with an E-cross-section was investigated by numerical simulation and experiment. The mechanism of lateral deformation was analyzed and the method to overcome it was given. This technology was successfully used for manufacturing a large flange which used in a large wind tunnel.
Strength Analysis of Planetary Trains’ Carrier of EPB Shield Machine
Authors: Chen Li Feng , Wu Xiao Ling , Qin Da Tong
Published: March 2010

The method to analysis the strength of planetary trains’ carriers of EPB(earth pressure balance) shield machine is presented in this paper. The structure of the shield machine trains is analyzed and the 3-D solid model of the carrier is built with Pro/E. After the load on the carrier has been dealt with, the strength of carrier is calculated by means of finite element method. The results via ANSYS show that the max stress and strain on the carriers are increasing as the increasing load on it. The max stress is lying on the joint point of the carrier and planetary gear shaft because of the bending deformation of the shaft.
Experiment Study and Finite Element Analysis of the Failure for 75000 m3 Wet Gasholder
Authors: Li Zhi Qiang , Yao Xiao Hu , Zhao Long Mao
Published: March 2010

In our city, 75000 m3 Wet Gasholder generated coal gas leak during the work due to the crack of tower wall , which directly endangered life and property security of the people. In the paper, the cause on the failure of gasholder was made much conjecture. Firstly, physicochemical examination and mechanics property on gasholder material component were conducted. Weld conditions between pillar and joist were observed on spot. Secondly, stress of gasholder was analyzed by using finite element code. Thirdly, field tests on the vibration of gasholder were also carried out by means of vibration apparatus. Finally, the principal cause of the failure is determined, and some propose on the maintenance and construction of gasholder is provided.
Thermodynamic Performance Simulation of Diesel EGR Cooler with Finned Tube
Authors: Wang Yan Song , He Hui , Xu Zhen Hua , Liu Jiang Hua
Published: March 2010

Exhaust gas recirculation (EGR) cooler plays an important role in reducing the nitrogen oxides (NOx) emission of diesel engines. By using the CFDesign software, in this paper, the finite element models are established for analyzing the thermodynamic performance of an EGR cooler. The temperature, velocity and pressure fields of the fluids in the EGR cooler are simulated and verified. Based on these models, furthermore, the thermodynamic performance of the EGR cooler with different structures of cooling tube are analyzed, compared and discussed. The results show that, under the fixed pressure boundary conditions, the EGR cooling efficiency can be significantly increased by properly design the fin number of the cooling tube in EGR coolers.
Hybrid Optimization Approach for Gas-Assisted Injection Molding Based on Metamodeling and Particle Swarm Algorithm
Authors: Chen Wei , Han Xian Hong , Zhou Xiong Hui , Ge Xue Wei
Published: March 2010

As a new plastic process technique, Gas-assisted injection molding has many advantages comparing to the traditional injection molding. Meanwhile, Optimization of Gas-assisted injection molding is more complex since many additional parameters have been introduced to the process. In this paper, a hybrid optimization approach based on metamodeling and particle swarm optimization algorithm is proposed and applied for Gas-assisted injection molding. Moreover, the validation of the approach will be illustrated through the optimization process of a real panel.