bluuebunny/crossref_metadata_2025 huggingface dataset:
Numerical Simulation of Induction Heating for Crankshaft
Authors: Liu Jin Xiang , Liao Ri Dong
Published: November 2010

This paper describes the three-dimensional modeling of an induction heating processing for crankshaft. To realize the suitable processing parameters of induction heating, magneto-thermal coupled analysis of eddy currents and heat conduction have been carried out by using the finite element method. The dependence of material properties on temperature is taken into account in numerical simulation. Influences of induction heating parameters on eddy current and temperature are identified. The transient temperature field of heated crankshaft is obtained. The simulation results can offer a reference in determining processing parameters.
Development of a New BCB ELID Lapping Process
Authors: Li Wei , Tian Qian Jun
Published: November 2010

In this paper, the mechanism of Electrolysis In-process Dressing (ELID) lapping process using new BCB (bamboo charcoal bonded) abrasive wheel is researched. Some experiments of machining for silicon wafers were carried out for exploring the effect of some machining process parameters on material removal rate and surface roughness. Experiments show that: Material removal rate and machined workpiece surface roughness are increased with increase of the lapping wheel’s rotation speed and processing loading; The machined workpiece surface quality is affected with the lapping wheel surface condition, due to the abrasives are trued by electrolysis dressing in the lapping process, therefore the BCB lapping wheel always keeps better machining condition to obtain excellent machined workpiece surface quality efficiently.
Finite Element Analysis on the Blade Structure of Centrifugal Pump
Authors: Wu Lan Ying , Wang Yan Lin
Published: November 2010

The centrifugal pump is the common mechanical equipment, which is extensively applied in the water conservancy, ships and other projects, and the blade structure is a very important part in the centrifugal pump. In this paper, the stress distribution and concentration of single blade in the impeller are analyzed under the different pressure field of the blade structure surface, and the fatigue failure of blade is also studied. The research results show that the we can get the stress and strain of the blade accurately and intuitively through the analysis for the blade structure, the stress concentration of the centrifugal pump blade is mainly in the root and junction of the wheel cover, and the import value of stress concentration is larger than the outlet; the stress concentration may be caused easily as the stress increases rapidly in the blade, which has a great impact on the fatigue strength, the fatigue limit of the blade with the stress concentration is decreased more obviously than the fatigue limit of the smooth blade.
Study of Low-Temperature WC-Co Coating by L-Solid Phase Reaction Sintering
Authors: Zhao Jun , Ma Shi Bo , Ma Jin
Published: November 2010

Adopted the method of vacuum sintering liquid-solid phase reaction to prepare metal-ceramic coating, focused on the microstructure, phase composition and performance of the coating, which was prepared by two kinds of binding phase materials. The results showed that: the coating, obtained by reaction sintering of cobalt-boron alloy and self-molten Fe-based alloy composite binding phase, had compact structure. WC hard phase of the coating didn’t have phenomena of burning loss, decarbonization, agglomeration and growth. WC phase was completely circle-molten by γ-Co primary solid solution and γ-(Co, Fe, Ni) supersaturated solid solution. Newly generated granular and lath-shape hard phase evenly dispersed in binding phase, which increased the wear resistance of the coating substantially. The relative abrasion of ceramic-metal coating prepared by composite binding phase was nearly 50% lower than the one prepared by Fe-based binding phase.
Numerical Simulation of Softness Abrasive Two-Phase Flow Field on Level Set Method
Authors: Ji Shi Ming , Weng Xiao Xing , Tan Da Peng
Published: November 2010

The soft abrasive flow machining was proposed for solving the problems of difficult contact finishing in course of mould manufacturing. It could reach the specular level and control turbulence abrasive flow. Based on the topological structure transformation of LSM, a two- dimensional model of the two-phase flow is established. This mechanics model with the SIMPLE (semi-implicit method for pressure-linked equations) algorithm incorporated is used to simulate the movement of the turbulent flow by using of k-ε model. The computed results show that this 2D model can preferably simulate the movement of the two-phase flow, and the characteristic parameters of abrasive two-phase flow are derived.
Investigation on Microstructure and Property of Non-Electric Welding Joint
Authors: Liu Ji Yan , Ma Shi Ning , Sun Xiao Feng , Liu Hong Wei
Published: November 2010

Non-electric welding is a novel efficient technique for emergency maintenance, which utilizes the heat released by combustion reaction to join metals without needing any power supply or gas sources. Welding experiments were performed with 45 steel as the weld object, and results showed that the weld metal jointed the weld object in a metallurgic connection with the tensile strength above 280 MPa, which proved non-electric welding a fusion welding technique. Non-electric welding technology has advantages of simple operation and good mechanical performance, therefore possesses a promising application prospect.
A Segregative MC Carbide in Centrifugal Casting High Speed Steel Roll
Authors: Luan Yi Kun , Song Nan Nan , Bai Yun Long , Kang Xiu Hong , Li Dian Zhong
Published: November 2010

A novel segregative carbide was discovered during the manufacture of high speed steel roll. The carbide with rectangular shape is a type of MC carbide not yet reported in the open literature. It is a face centered cubic carbide with a lattice parameter a=0.414445 nm, very close to the VC carbide but with a different chemical composition. The M represents the metallic elements (at.%): 91.80 V, 3.17 Cr, 2.19 Fe and 2.83 Mo.
Modal Analysis about Direct-Drive Bi-Rotary Milling Head
Authors: Yan Ming , Tang Le , Zheng Peng , Zhang Ming Yuan
Published: November 2010

Vibration characteristic of direct drive A/C bi-rotary milling head is been analyzed by finite element method (FEM), former four order vibration modes of the milling’s structure are given. The influence of the swing angle of the A-axis to the natural frequency of the milling head is analyzed. The natural frequencies when the milling head is working are interval values, the first order natural frequency is [120.48, 122.91], the second order natural frequency is [139.68, 142.08], the third order natural frequency is [328.68, 331.9], the fourth order natural frequency is [369.68, 372.45]. This computing provides technological support for design and improvement of this type of milling head.
Measurement of Residual Stress by Cutting Method in Cold Ring Rolling
Authors: Zuo Zhi Jiang , Fu Le Rong , Li Yao
Published: November 2010

The residual stress in cold ring rolling could cause great error to parts quality. Due to the complicated formation of residual stress, it's difficult to calculate theoretically. In present study, measurement method is generally used. According to the shape of ring, cutting method is the best method for measuring residual stress. There were 6 stages in cold rolling deep groove ball bearing race. Electric wire discharge machine was used to cut the rings after rolling in each stage. The radius of rings would change after cutting. According to the derived analytic calculation theory of residual stress, the residual stress could be calculated in different rolling stage. The residual stresses were in the range of 110-200MPa. Compared the measurement results from finite element simulation results, the greatest difference was 20%, which was in accepted rang. Through calculation results of six stages in cold ring rolling, it could found that the residual stress increased with the increase of deformation, the straightening stage was benefit to decrease residual stress.
Research on the Process Simulation of NC-ECM with Ball-End Tool-Electrode
Authors: Kang Min , Fu Xiu Qing , Yang Yong
Published: November 2010

In order to solve the difficult problem in analyzing the shaping law of numerical control electrochemical machining (NC-ECM) with ball-end cathode, the process simulation based on the finite element method (FEM) is used in this paper. First, the two-dimensional analysis model of the electric field in NC-ECM with ball-end tool-electrode built by use of ANSYS software was solved, and the current density distribution and the machined surface shape on the workpiece were obtained. Then, the experiments based on the simulation parameters were carried out, and the cutting depth values were measured. Finally, the accuracy of the simulation was verified by the comparison between the calculated values and the actual values. The experiments showed that the simulation method meets the accuracy of the engineering calculations in NC-ECM.
Joule Energy Deposition in Segmented Metal Wire Electrical Explosion
Authors: Bi Xue Song , Zhu Liang
Published: November 2010

Electrical explosion of wire has a prosperous future in fine powder producing. In the process of electrical explosion of segmented metal wire (EESW),energy deposited in the wire was influenced by process variables such as the initial charging voltage of the capacitors, the length and the diameter of the segmented wire,and the electrode spacing. For understanding their relation completely, a series of experiments of electrical explosion was carried out with variations of the initial charging voltage and the segmented wire lengths and diameter. Results show that, energy deposition efficiency was weakly dependent on the wire length , whereas it has a strong dependence on the wire diameter, the initial charging voltage of the capacitors have an important influence on the energy deposition.
A Machining Error Compensation Method Using on-Machine Profile Measurement in 3-Axis Aspheric Grinding
Authors: Huang Hao , Lei Xiang Yang , Wang Jian , Xu Qiao , He Liang Yu , Guo Yin Biao
Published: November 2010

The causes of machining errors are very complicated and apt to mutual influence in aspheric grinding, so it is difficult to improve machining accuracy by control one cause. To compensate the machining error of large aspheric grinding, an error-compensation technique using on-machine profile measurement system in three axes grinding machine are presented. To verify the effectiveness of the compensation machining and the reliability of the measurement system, experiments on high-precision grinding machine were performed. Moreover, the compensation machining with the on-machine measurement substantially decreases the machining errors and improve machining accuracy by more than 45%, compared with the non-compensation machining.
Self-Adaptive Compensation Method on the Tool Position of Roller Gear Cam Surface
Authors: Ge Rong Yu , Wang Qing Song , Shang Xu Qiang
Published: November 2010

The roller gear cam surface is often machined by the unequal diameter manufacture method, which means the tool diameter is smaller than that of the roller and the tool position compensation method is most used. For tool position of roller gear cam, it is important to confirm the compensation vector for the tool position compensation method, including compensation value and direction. In the paper, a new self-adaptive tool position optimization method is proposed, which make minimizing the normal machining error as the object function and make two compensation factors as the optimization variables. This algorithm can find out the best compensation direction and value by the tool position optimization for any cam rotation angle and make the tool position self-adaptive and flexible compensation according to the machining error. A numerical calculation example shows that the optimization algorithm can feasibly reduce the machining error. At last a conclusion has been drawn that the radius difference between the tool and the roller is the best compensation value and the best compensation direction is not fixed.
Numerical Simulation on Quenching Temperature Field of 40Cr Steel
Authors: Cui Di , Liang He
Published: November 2010

The quenching process is a complex process, which involves quenching medium flow field, work piece temperature and stress field. In this paper, the 40Cr steel belt wheel is chosen for the sample of finite element method to simulate the quenching process. The temperature changes with time at any position in the work piece are directly reflected in the actual quenching process. The cooling curves of center and general surface are obtained after simulation. Combined with cooling curve of transformation of under cooled austenite, it is easy to predict whether the technological results meet the performance of organization, and conduct a security assessment of the work piece.
Influence of Three Organic Phosphonates on Calcite Crystal Growth
Authors: Chen Chun Yu , Xia Ming Zhu , Wang Feng Yun
Published: November 2010

Calcite is a common scale in water cooling systems treated and controlled with Organic phosphonates. The effect of three phosphonic acids (ethylene diamine tetra(methylene phosphonic acd), EDTMP; hexamethylene diamine tetra(methylene phosphonic acd), HDTMP; and diethylene triamine penta(methylene phosphonic acd), DTPMP) on the growth of the calcite has been investigated by pH curve method(pHCM). Experimental data obtains by pH value measurement of Ca(HCO3)2 supersaturated solution before and after precipitation. Besides, molecular dynamic simulations of the interaction of the phosphonic acids with the calcite(104) indicate the inhibitor effectiveness: EDTMP< DTPMP< HDTMP according to the difference in the carbon chain between nitrogen atoms. This is in agreement with the pHCM measurements.
Oxidation Behavior of Glass/Yttrium Silicates/SiC Multi-Layer Coating Coated Carbon/Carbon Composites in Air and Combustion Gas Environment at High Temperature
Authors: Huang Jian Feng , Wang Ya Qin , Li He Jun
Published: November 2010

Glass/yttrium silicates/SiC multi-layer coating for carbon/carbon (C/C) composite was prepared and the flexural strength and weight changes of the coated samples after oxidation in air and combustion atmosphere at 1500oC were investigated. Results show that when oxidation in air and combustion atmosphere, the C/C composites lost weight by a linear and a parabolic law respectively. The weight loss reaches its maximum value at about 800oC in air but the strength of the specimen arrives at the lowest value at about 850oC. There are three oxidation zones along the specimens. A non-oxidation zone is below 400oC. Close to it is the cracking-oxidation zone (400-1100oC). At the temperature range from 1100oC to 1500oC is the coating-oxidation zone. Fracture of the coated sample at the temperature spot of 850oC is observed after oxidation in combustion atmosphere at 1500oC for 70 hours, which are considered to be responsible for the cracking and decreasing in strength during the test in combustion atmosphere.
Effect of Pulsed Magnetic Field on Structure Refinement of Pure Magnesium
Authors: Wang Bin , Sun Ming Li , Wei Qiang
Published: November 2010

A pulsed magnetic field (PMF) was introduced into the solidification of pure magnesium and the effect of structure refinement is investigated. The results show that remarkable microstructural refinement is achieved when the pulsed magnetic field is applied. The morphology is characterized as the columnar grains at the periphery and equiaxed grains at the core. The average grain size in the center of ingot is refined to 260m at the optimal processing parameter (5Hz, 200V). The pulsed magnetic field increases melt convection during solidification, as a result, the stress fractures the dendrites inwards from the mould wall, and the fractured dendrites act as nuclei, so the big columnar grains are prohibited.
Modeling of the High Frequency Plasma Reactive Synthesis of Titanium Dioxide Nanoparticles
Authors: Li Peng , Sun Yan Ping
Published: November 2010

High purity spherical nano-powder materials can be synthesized using high-frequency plasma chemical vapor deposition (HF-PCVD) by electrodeless discharge. A generalized two-dimensional mathematical model for the reactive synthesis titanium dioxide (TiO2) nanoparticles using HF-PCVD was developed based on reaction engineering theory, the model can theoretically describe the distribution of temperature and conversion of titanium tetrachloride(TiCl4) reactant in reactor. The model was proved by using experiment conditions. It was reasonable explained by simulation results of the model that why the average particle sizes of TiO2 nanoparticles product is vary in different experiment conditions, that is, at shorter residence time and a lower concentration of TiCl4 reactant, the particle sizes of TiO2 nanoparticles is smaller and more uniform distribution, but a lower conversion rate of TiCl4 reactant，vice versa.
Effects of Applied Voltages on Micro-Arc Oxidized Coatings of Magnesium Alloy AZ91D in Aluminate Solution
Authors: Mu Wei Yi , Luo Rui Xue , Li Zheng Xian , Du Ji Hong , Xi Zheng Ping
Published: November 2010

Micro-arc oxidation coatings were prepared on magnesium alloy AZ91D substrates at the different applied voltages in aluminate solution. The morphologies, phase components, and corrosion resistances of the coatings were investigated. The effect of the applied voltages on the microstructure and corrosion resistance of the coatings was also discussed. The results indicate that the coatings are uniform in thickness, and mainly composed of MgAl2O4 and MgO. There were many residual discharging channels on the coatings surface. The coatings improved the corrosion resistances of magnesium alloy AZ91D considerably. With the increase of the applied voltage, the thickness and the MgAl2O4 content of the coatings increase, while no significant variation is observed in the MgO content. The coatings surface becomes lower porosity and larger pore size with increasing of the applied voltage. In addition, the corrosion resistances of the coatings on magnesium alloy AZ91D surface are obviously superior to the magnesium alloy AZ91D substrate in the 3.5 wt. % NaCl solutions, and the effect is more remarkable at higher voltage.
Periodic Nanostructure on 65Mn Produced by Femtosecond Laser Irradiation
Authors: Yuan Dong Qing , Xu Jian Ting
Published: November 2010

The periodic microstructures on 65Mn plate were induced by the irradiation of the femtosecond laser with the laser wavelength of 800 nm and the pulse length of 130 fs. The parallel periodic ripples structures were observed at the laser fluence of 1 J/cm2 with different pulses number( N=5,50,400,800) which lied parallel to the laser electric polarization field vector. For 400 pulses, the nano-holes arrays were generated to interrupt the consistent ripples structures.For 800 pulses, initial nano-holes evolution to the grooves, which the direction were uncertainly. Further experiments have been made to induce large area consitent ripple structures by scanning, at the laser fluence of 1 J/cm2 with speed v=500μm/s. 2D arrays were induced by accurate processing control
Experimental Study on Planar Unidirectional Permeability of Glass Fiber Preforms at Constant Flow Rate
Authors: Yan Shi Lin , Yan Fei , Qiu Zhong Qi
Published: November 2010

During the resin flow of Resin Transfer Molding, the permeability of fiber performs is an important parameter, which reflects the interaction between the resin and fiber. In this paper the Darcy’s law was used as the fundamentals to determine the permeability of fiber performs, an experiment installation was designed, and do some experimental study on the one-dimensional permeability of resin in the multilayer fibrous plaids at a constant flow rate. The installation was designed base on condition of different flow rates and different fiber volumes (or porosity), and compared the results of the permeability of different flow rates. Then analyzed the results, and some content conclusions were obtained.
Surface Inorganic Modification of Wollastonite and its Application in Filling Polypropelyne
Authors: Wang Cai Li , Zheng Shui Lin , Xu Xi , Wang Zhao Hua
Published: November 2010

Wollastonite was inorganic modificated by coating aluminium silicate with heterogeneous deposition method.SEM, XRD, FTIR, BET surface area analyzer were used to characterize the product. XRD result shows that wollastonite is coated with nano-aluminium silicate. BET result shows that the specific surface area of particles increases by 200%. FTIR result shows that the content of OH group increases.Whiteness test shows that the whiteness increases by 2.0. Application test shows that the polypropelyne(PP) products filled with inorganic modificated powder have superior physical properties or mechanical properties(tensile strength 20.45Mpa, bending strength 38.02Mpa) than that with uncoated wollastonite and pure PP and the heat distortion tempeature increases by 28.6°C than pure PP.Inorganic modification of wollastonite can improve the joint interface between wollastonite and PP.
Dyeing Properties to Soybean/Flax Blended Yarn with Reactive Dyes
Authors: Liu Jie
Published: November 2010

For producing more colorful soybean /flax blended yarns and fabrics and to evaluate the dye-ability of the blends yarn, two types of reactive dyes, containing mono- and bi-functional reactive groups, were studied. On basis of a number of experiments, influences of time and temperature, alkali dosage, addition of promoter are analyzed, the optimum conditions to soybean/flax fibers with Reactive Yellow K-R and Reactive Yellow B-4RFN are defined. Results of performance test indicate that both K-type reactive dyes and B-type reactive dyes have good colorfastness and levels, especially for light to moderate color, and B-types is better than K-types. The colorfastness of the dyed yarns can meet the general requirements.
Study on H2S Corrosion Resistance of Arc-Sprayed Pseuado Zn-Al Alloy Coatings
Authors: Gao Wei , Zhao Zhen Yun
Published: November 2010

Pseuado Zn-Al alloy coatings were made by using of dissimilar metal wire arc spraying technology on the surface of the steel Q235 and the H2S corrosion experiment was carried out on the coatings. The corrosion rate was calculated with weight-loss method. The configurations of Zn-Al coatings before and later suffered corrosion were observed with scanning electron microscope, and the coating surfaces were analyzed with energy spectrum. The corrosion potential of the coatings was tested by using the electrochemistry testing system. The corrosion results showed that Zn-Al coatings can protect the covered steel surface and the steel substrate exposing in the corrosion environment. Being processed with pore sealer, the coatings have shown more excellent corrosion resistance.
Experimental Research on CBN Grinding Wheel Mechanical Dressing with Ultrasonic Vibration Assistance
Authors: Gao Guo Fu , Zhao Bo , Zhao Jie , Tong Jing Lin
Published: November 2010

The experimental research on CBN grinding wheel mechanical dressing assisted by ultrasonic vibration was carried out. Experimental results showed that ultrasonic vibration dressing is capable to improve surface topography and roundness of CBN wheel as other untraditional dressing methods. Compared with traditionally mechanical dressing, the counts of static effective grains of CBN grinding wheel dressed assisted by ultrasonic vibration increased clearly and it had clear relationship with the acoustic parameters and the dressing lead. The grains had a large protrusion height and kept good integrity after ultrasonic dressing. The technology of vibration dressing is able to prepare precisely the CBN grinding wheel.
Surface Roughness Prediction in the End Milling Parameters of Aluminum Nitride Ceramic by Response Surface Methodology
Authors: Reddy Moola Mohan , Gorin Alexander , Abou-El-Hossein Khaled A.
Published: November 2010

The present experimental study aimed to examine the selected machining parameters on Surface roughness in the machining of alumina nitride ceramic. The influence of cutting speed and feed rate were determined in end milling by using Cubic boron nitride grinding tool. The predictive surface roughness model has been developed by response surface methodology. The response surface contours with respect to input parameters are presented with the help of Design expert software. The adequacy of the model was tested by ANOVA.
A New Method for Surface Process of Polyester Film-Biomodification
Authors: Zhang Wei Ling , Zhang Jian Fei , Li Zheng , Gong Ji Xian , Yang Hui Ping , Shang Ke Ke
Published: November 2010

Biomodification of polyester film is a new field which can improve the surface property of material whithout environmental pollution and high energy consumption. Bacillus B-F which was isolated from waste water could biodegrade terephthalic acid. It was fermented and the broth was concentrated and used for surface process of polyester film. The modification lasted for 20 days. The surface property of the original and modified polyester film were tested. Contact angle examination showed that the hydrophilicity and surface free energy of the film was increased; XPS tests revealed the content of oxygen increased; FTIR showed that a small quantity of phenolic hydroxyl group appeared on the surface of the film; an oxygenase catalysed action might react at the surface of the film according to the degradation pathway of the simulacrum terephthalic acid.
Direct Pattern Transfer of the Surface Structures of Shark Skin onto Thermoplastic Polymers
Authors: Han Xin , Wang Juan
Published: November 2010

Biomimetic surface structures have profound influences on the development of many emerging devices and systems. In this study, a sequential approach involving hot embossing and polymer casting for transferring biological surface structures to thermoplastic polymers were investigated and developed. The surface structure on shark skins (Carcharhinus brachyurous) was used as a case study. A PMMA pattern was fabricated by directly hot embossing the biological surface of the skin. The resulting PMMA structure was used as a casting master for rapid feature transfer onto PDMS surfaces. The replicated surface patterns on the polymer were found to be comparable with those on the shark skin. The water tunnel test of the flatplate sample pieces suggests that the drag reduction efficiency of the biomimetic shark-skin surface achieves 8.25% in maximum and 6.91% in average, which validates that this forming technology can be applied to the direct pattern transfer of the firm creatural scarfskins onto thermoplastic polymers.
Research on Bursting Behavior in Hydroforming of Double-Cone Tube
Authors: Yuan Wen Jing , Tian Hao Bin , Liu Xiao Hang , Wang Xiao Song , Yuan Shi Jian
Published: November 2010

Firstly, the geometry condition of useful wrinkles during the hydroforming of double-cone tube was given. Then the stress condition of useful wrinkles was given by formula between the parameters of wrinkles shape at the end of axial feeding and internal pressure, hoop stress and axial stress. The analytical results were compared with the FEM analysis and experiments results. The results show that the useful wrinkles must meet both the geometry condition and the stress condition. The geometry condition of useful wrinkles is that the area of arbitrary length of wrinkles is a little smaller than the area of corresponding die cavity. The stress condition of useful wrinkles is that shape parameter G is not smaller than the radius R at the top of middle wrinkle. That means the increment of thickness strain dεt is positive and no thickness thinning will occur during the calibration. When the wrinkles didn’t match geometry condition, the dead wrinkles or bursting will take place. And when the wrinkles didn’t match stress condition, the bursting at top of middle wrinkle will occur during the calibration.
Selection of Tool Materials and Cutting Parameters Optimization for Turning Nickel-Based Powder Metallurgy Superalloy
Authors: Qiao Yang , Ai Xing , Liu Zhan Qiang
Published: November 2010

Powder metallurgy (PM) nickel-based superalloy is regarded as one of the most important aerospace industry materials. A series of turning tests in a wide range of speeds with different inserts were carried out to select the proper tool material. Then, the effect of cutting parameters on the cutting force, cutting temperature and tool wear was investigated for the selected insert. The effect of cutting parameters on the tool wear was examined through SEM and TEM micrographs. The experiential functions of tool life, cutting force and cutting temperature were developed. Finally, the cutting parameters in PM nickel-based superalloy dry turning were optimized based on tool life-efficiency contour analysis. The present approach and results will be helpful for understanding the machinability of PM nickel-based superalloy during dry turning for the manufacturing engineers.
Logistic Simulator for Steel-Making Process
Authors: He La Mei , Hu Yan
Published: November 2010

Setting up an adaptable and flexible simulation model for steel-making process is very important to improve production system design and manufacture automation. To assist the decision-makers in steel-making plants, the Logistical simulator for steel-making has been developed using em-Plant software. The Simulator can be used to rapidly model any steel plant, including the movement of the operation equipments and the changes of production parameters. With the help of Simulator, the influences of lay-out changes, process parameters, and changes in planning could be revealed vividly, and the realistic production planning could be created. Results include production Gantt charts, display of cranes track, utilization figures and production statistics. Simulation cases show that the simulator is valid for simulating different steel-making processes, and production states on different conditions can be investigated by using this model.
Columnar Crystal Growth of Ti46Al0.5W0.5Si Alloys Directional Solidified by Rectangular Cold Crucible
Authors: Yang Jie Ren , Chen Rui Run , Ding Hong Sheng , Guo Jing Jie , Fu Heng Zhi
Published: November 2010

This paper has systematically studied the evolving process of column crystals of Ti46Al0.5W0.5Si alloys that is directionally solidified by rectangular cold crucible. The results showed that: the solid/liquid interface presented convex to the liquid metal due to the complicated influences by cold crucible. Overheating temperature and new crystal nucleus had great effects on the growth continuity and the stability of column crystals. Furthermore, the precipitation phases have been studied. As a result, the methods for controlling growing process of columnar crystals have been submitted, which are playing a critical role in optimizing experimental parameters and devising the construction-elements of cold crucible.
Research on Machining Deformation of Miniature Thin-Plate Parts in Milling
Authors: Zhang Yong Yu , Cui Xiao Kang , Du Xiang Yang , Wu Chao
Published: November 2010

The machining deformation of the sewing-needle body that is the typical miniature thin-plate part is analyzed. The result demonstrated that not only one kind of stress occurred in the milling of sewing-needle part. The magnitude of cutting force is an important parameter determined the extent of machining deformation. The experimental test of the milling cutting force is developed. The cutting force and the mode of milling can influence the dimension changing that resulted the dimension error.
Experimental Study of the Silicon Start-up Heating and Melting Process in an Inductive Cold Crucible
Authors: Huang Feng , Chen Rui Run , Guo Jing Jie , Ding Hong Sheng
Published: November 2010

The electromagnetic continuous pulling is a newly growth technology as a promising process for silicon preparation, start-up heating is necessary for the semiconductivity of silicon at room temperature. Investigations were carried out to study this process in a square crucible with the frequency of 50kHz, details of the experimental procedure were given, the affecting factors, electrical performance and heat explosion problems during the process were measured and discussed. The results indicated that the best conditions for the preheating were the central position of the base in the coil, the higher power and the proper primary mass of silicon setting. The electrical performance indirectly showed the pool conditions and so it can be effectively used to control the melting operation.
The Design of Ultrasound-Aided Electro-Spark Deposition Device and Experimental Investigation
Authors: Deng Yu , Guo Zhong Ning , Huang Zhi Gang , Nie Ling , Li Yong Yong
Published: November 2010

In this study, a novel method based on ultrasonic aided electro-spark deposition has been put forward, and the design of the new electrode device was introduced. The technology of ultrasound-aided electro-spark deposition has been investigated. And the influence of output voltage, output discharge frequency, deposition ratio and protection gas flow on deposition thickness have been studied, some experiment phenomenon also were explained. What is more, some processing rules were summarized.
A Study on the Monitoring Technology of Extra-Large Deep Hole Drilling Using the Acceleration Sensor
Authors: Kim Nam Hun , Shin Il Sik , Park Jeong Woo
Published: November 2010

This study is on the configuration of deep hole drilling system for machining of extra-large common rail fuel supply pipes. Machining conditions for deep hole drilling were deduced and stability of the developed system was verified through measurement of machining surface roughness. Also, an acceleration sensor was used for real-time monitoring on machining of deep hole drilling. Machining state was evaluated through composition of a control system for signal feedback.
Parameter Identification for HAPC System in Hot Tandem Mill
Authors: Li Xu , Zhang Wen Xue , Zhang Dian Hua , Yan Dan
Published: November 2010

Under condition that exact values of model parameters can not be calculated accurately in hot tandem mill system and change with the time passing, model parameters are identified by adopting identification method based on the parameter model and sampling the datum on site; Basic automation system is used for the sampling of actual data, MATLAB software is adopted for curve fit. By comparing the experimental data and simulation data, the consequence of simulation testifies the accuracy of identified mathematical model.
Research on Microstructure and Wear Resistance of Double Glow Plasma Discharge Surface Titanizing on CrZrCu Alloy
Authors: He Bo Lin , Tu Fang , Liu Jing
Published: November 2010

CrZrCu is extensively used in spot welding due to their high electrical, thermal and mechanical performance. But when CrZrCu electrode is used in spot welding of galvanized steel sheet, the abrasion, corrosion and oxidation shorten the electrode life rapidly. The electrode is not able to meet the needs of spot welding of galvanized steel sheet .In the paper, double glow plasma discharge surface titanizing was carried out on CrZrCu alloy. The processes of double glow plasma discharge titanizing, surface alloying layer structure were also analyzed elementary. The wear resistance property of glow discharge plasma titanizing layer was also researched. The experimental results indicated that in the plasma titanizing alloying layer, the diffusion of titanium element toward the interior of the CrZrCu alloy substrate forms the intermetallic compound named Cu4Ti, which is beneficial to the reinforcement of CrZrCu substrate. The experimental results confirmed that double glow plasma discharge titanizing could improve the wear resistance of CrZrCu alloy greatly. Under the external load of 300N and 500N, the wear resistance of double glow plasma discharge titanizing layer is7 times and 8.5 times than that of CrZrCu.
Analysis about Effect of Rolling Parameters on Broadwise Deformation
Authors: Jin Jie , Tian Sheng Wei
Published: November 2010

The effects of rolling parameters on the broadwise deformation of the workpiece are analyzed by rigid-plastic finite element method. At the basis of better grasping the effective law on freedom broadwise deformation ,the effects of the Oval height and Oval width on the Forced /Restricted broadwise deformation in rolling process are analyzed. Considering the equivalent strain,the effects of the Oval height and Oval width are gotten again using the related strain data in the DEFORM-3D post-processing.
Numerical Study on Characteristics of EFP with Two Kinds of Liner Materials
Authors: Wang Shu You , Jiang Jian Wei , Men Jian Bing
Published: November 2010

The formation, flight and penetration process of explosively formed projectile (EFP) was computed by using nonlinear dynamic finite elements code AUTODYN-2D. 10# steel and Copper are chosen for EFP material calculation and Quasi-spherical EFP was technically designed for small-bore warhead, the configuration of EFP with these two kinds of material was optimized respectively. The decay equation of projectile velocity was used to analyze the velocity variation of Quasi-spherical EFP, the impact velocity was obtained. Characterization of EFP penetrate into A3 steel plate was analyzed by compare the results of 10# steel and Copper, EFP made of these two kinds of material are capable to perforate A3 steel plate with a thickness of 0.45 times diameter of charge.
Improving Performance of BaCo0.7Fe0.2Nb0.1O3-δ Ceramic Membrane by a Surface-Coating Layer for Partial Oxidation of Coke Oven Gas
Authors: Cheng Hong Wei , Lu Xiong Gang , Hu Da Hai , Zhang Yu Wen , Ding Wei Zhong , Zhong Qing Dong
Published: November 2010

The BaCo0.7Fe0.2Nb0.1O3-δ (BCFNO) membranes combined with Ce0.8Re0.2O2-δ (Re=La, Y) layer on the permeation side were used for hydrogen production by partial oxidation reforming of coke oven gas (COG). The Ce0.8Re0.2O2-δ improved the oxygen permeation flux of the membrane by 11–28% at 750 oC. The high oxygen permeation flux achieved using the Ce0.8Re0.2O2-δ surface-coating layer in this work are quite encouraging with a maximum value reaching 19.7 ml/cm2•min at 900 oC, which will be promising surface modification materials in the catalytic partial oxidation reforming of COG.
The Motion Analysis and Its Modeling of Machining the Ruled Curved Surface by Five-Axis Linkage WEDM
Authors: Wang Xin Rong , Li Xiao Hai , Zhang Xia
Published: November 2010

The five-axis linkage WEDM system with the rotate-swing-swing worktable accessories was developed to machine the ruled curved surface parts, and the component, motion parameters and motion laws of this system were analyzed. According to analytic geometry of space, the forming principle of ruled curved surface was analyzed, and the accordingly mathematics models of the five-axis linkage WEDM system were established, and the common functions were illustrated with examples. At last, the typical samples were machined in accordance with the mathematics models, the ideal machining results also prove the correctness of the mathematics models established, which widen the range of processing by WEDM, solve the difficult problem of space ruled curved surface parts.
An Experimental Study on Micro Thixoforming Processing Parameters for Reaction Plate with Micro-Pin-Fin Arrays
Authors: Zhou Hong Hua , Yao Zhe He , Chen Zi Chen
Published: November 2010

Processing parameters of micro thixoforming, such as height-diameter ratio, die/punch temperature, billet temperature, and punch speed, have direct and complex impact on final quality of the workpiece, which is to be applied as the reaction plate of a microreactor for hydrogen production from methanol steam reforming. The micro/meso features of the workpiece, which is for catalyst loading, are micro-pin-fin arrays. Size of the surface area and uniformity of the pin-fins are quantified by average height (Ha) and relative standard deviation (RSD). An orthogonal experiment design is adopted to investigate the influence of the parameters on the semi-solid forming process. The results of the orthogonal experiment show that the optimum parameters are 150 °C for die/punch temperature, 576 °C for billet temperature, 0.14 for height-diameter ratio and 8.33 mm/s for punch speed. The experimental results validate that the optimized processing parameters can improve the quality of the reaction plate with micro-pin-fin arrays.
Stents Cavity Processing Technique
Authors: Zhao Ning , Sun Yan Ping
Published: November 2010

According to the characteristic of the thin-walled components, through the analysis which carries on to the complex stents structure and the material, This article found the reason of the components’ distortion, and then designed the self-made jig, the self-made cutting tool, and choiced the optimized processing parameter and so on, summarized the processing technique of the stents cavity, improved the components processing quality and the processing efficiency.
Etching Effects of Nanotechnology Fabrication on CMOS Transistor Gate Wafer Manufacturing Process Integration
Authors: Weng Chun Jen
Published: November 2010

As wafer nanotechnology gate is scaling down, the fabrication technology of gate spacer for transistor becomes more critical in manufacturing processes. Because wafer fabrication technologies, sidewall spacers play an important role in the control of short channel effects by offsetting ion implantation profiles from the edge of the gate. The present study is to overcome the fabrication processes limitations and proposed modified feasible etching processes integration on the formation processing for complementary metal oxide semiconductor nanofabrication process of gate spacer technology and electrical characteristics.
Study on Ultra-Turning Technology of Optical Chalcohalide Glass Using Diamond Tool
Authors: Liu Mao Fu , Liu Lin Zhi , Han Hui Xian
Published: November 2010

Chalcohalide glasses become ideal infrared optical fiber materials because of its isotropy, homogeneousness and high transmittance in visible and infrared region. This paper reported an experimental study on micro aspherical lens using ultra-precision single-point diamond turning technology. Turning test of a GeSe2 sulfur-base glass aspheric lens using form error compensation technique is conducted and investigated in turning process. The experimental results show that micro aspheric lens surfaces with form (PV) around 0.167 µm and a roughness (Ra) less than 2 nm is achieved successfully.
Orthogonal Experiment Research on Tool Wear Characteristics in Diamond Cutting of Glass Soda-Lime
Authors: Zhou Ming , Jia Peng
Published: November 2010

For the technology of diamond cutting of optical glass, the high tool wear rate is a main reason for hindering the practical application of this technology. In this work, orthogonal experiment of diamond cutting was carried out on soda-lime glass, and the result of tool wear test was detected by utilizing confocal microscope. Extremum difference analysis was employed to research the influence of different cutting condition on tool wear. The characteristics and mechanisms of tool wear in diamond cutting of glass were revealed and interpreted.
Optimization of Parameters in Long Fiber Reinforced Reaction Injection Molding on Bending Properties
Authors: Chen Feng , Cao Chun Ping , Zhang Wei , Sun Yu
Published: November 2010

The process of long fiber reinforced reaction injection molding (LFR-RIM) was introduced in this paper, which was used to prepare Long glass fiber reinforced foam composite materials based on polyurethane, and the bending properties of the composites were studied by this experiment. The results show that the optimal combination of technology is basically the same through the range analysis of bending strength and elastic modulus of the products, that is the fiber content A=30%, fiber length B=25mm, mold temperature C=45 °C, mixture temperature D=30 °C, the module time E=12min, ratio of material A and material B F = 1:1.85, and through the verification of the optimal combination, the bending strength was 414.96Mpa, and the bending modulus was 17.81Gpa. Though the variance analysis of bending strength and modulus of elasticity, it is found that fiber content and fiber length is the most significant factor, and the mold temperature is the least significant factors.
Development of a Multi-Quantum-Well Spatial Light Modulator and its Nonlinear Electro-Optical Driving Circuit
Authors: Wu Lan
Published: November 2010

A Multi-quantum-well (MQW) spatial light modulator (SLM) was developed and tested. The test results shows that CR could reach 1.7,the swing of driving voltage is 1.5 under the conditions of room temperature while the wavelength is 847.6nm,and the CR could reach 5.1,the swing of driving voltage is 3.2 under the conditions of the temperature of -15.4oC while the wavelength is 846nm. A programmable driving circuit is also developed to aim at this SLM. The chip of this driving circuit, with 64×64 array, adopted the 0.35µm CMOS technique. The test results show that, the resolution of driving voltage is alterable and could up to 256-level with only 65*65µm2 pixel estate. The driving voltage swing is from 0 to VDD. It could be flip-chip bounded with Multi-quantum-well (MQW) spatial light modulator (SLM). The driving circuit meets all the requirements of the Multi-quantum-well (MQW) spatial light modulator (SLM).
A Two-Stage Optimization Method for the Stencil Printing Process Based on Neural Network and Response Surface Method
Authors: Pan Er Shun , Jin Yao , Mei Zhao , Wang Ying
Published: November 2010

A stencil printing process (SPP) optimization problem is studied in this paper. Due to the
limitation that neural network requires a large number of samples for the accurate model fitting, a
two-stage SPP optimization method is proposed. The design interval can be reduced with small sample
by using neural network. In this reduced design interval , response surface method is adopted to obtain
the accurate mathematical SPP model. The concept of confidence level is introduced to make the
proposed model robust. An interactive method is used to solve the model. The proposed method is
compared with the one-stage optimization method and the results show that the proposed method
achieves a better performance on each objective.
Study on Electrical Aging Lifetime of Power Cable with Extruded Insulation
Authors: Li Wei Guo , Ye Gao Sheng , Wang Shi Kun
Published: November 2010

Extruded insulation is a major kind of insulation used in power cable. It is significant to evaluate extruded insulation lifetime suffered from electrical aging, which can improve the reliability of power cable. In this paper, a step-stress test method is used in accelerated life tests and Weibull model is used to statistic analysis for the mean lifetime of several samples under the same voltage value, and then the least square method is used to calculate the parameter of Weibull distribution. This paper uses inverse power function to fit test data and calculate voltage endurance coefficients. Constant-stress test data is also used as the counterpart of that measured by the step-stress test. It is indicated that the test voltages of step-stress test are more easily selected than that of constant tests and the data of the former is less scattered and the result is more reliable.
Study for Preparation and Photoelectric Property of ZnSe Crystal
Authors: Liu Cui Xia , Jian Zeng Yun , Zhu Man
Published: November 2010

ZnSe is a kind of important semiconductor photo-electricity materials, which has received common attentions. The preparation and photoelectric property of high quality ZnSe single crystal have become the focus on current research fields. In this paper, the preparation methods were discussed emphatically and optical and electrical properties were analyzed on these bases. Furthermore, the application prospective was discussed. Therefore, this paper provided research basis for preparation and application of ZnSe.