bluuebunny/crossref_metadata_2025 huggingface dataset:
Constitutive Equation for V–5Cr–5Ti at High Temperatures Measured Using the SHPB Technique
Authors: Hu Wen Jun , Xie Ruo Ze , Huang Xi Cheng , Yan Yi Xia
Published: August 2011

A high temperature split Hopkinson pressure bar (SHPB) test system is used to investigate the effects of temperature as well as those of strain and strain-rate. Effects of temperature for the vanadium alloy (V-5Cr-5Ti) are investigated by developing a high temperature SHPB test system. In this work, high temperatures greater than 1100°C are attained in the SHPB test specimens by using a synchronically assembled heating system .When testing with the high-temperature SHPB apparatus, care is required to prevent oxidation of the surface of the specimen, and to prevent an inhomogeneous temperature distribution from developing in the specimen. To determine the true flow stress–true strain relationship, specimens are tested from 15°C to 1100°C and at a strain-rate of about 3000 s-1: The parameters for a Johnson–Cook constitutive equation is determined from the test results. The Johnson–Cook constitutive equation is suitable for expressing the dynamic behavior of the V-5Cr-5Ti vanadium alloy.
Effect of Welding Thermal Cycle on the Microstructure and Mechanical Properties in Multi-Pass Submerged-Arc Welding
Authors: Chen Zhong Yi , Ma Yong Lin , Xing Shu Qing
Published: August 2011

To research effect of welding thermal cycle on the microstructure and mechanical properties of welded joint, two pieces of 60mm thick plates were welded together using automatic submerged-arc welding (SAW) method with suitable welding parameters. After 17 passes welding, the microstructures and phases of the welded joint was carefully observed and analyzed by using a Carl Zeiss optical microscope in different zones of welded joint, and the surface micro-hardness of the welded joint was measured systematically by using microscopic-hardness tester Lycra. Afterwards, the mechanical properties of the weld metals were measured through stretching. Through a series of measurements and observations, the welding experiment results indicate that effect of welding thermal cycle on the microstructure and mechanical properties of welding joint is great, the grains of the bottom of the weld metal are certainty smaller and more uniform, and the bottom of the weld metal have more excellent mechanical properties.
Synthesis Error Analysis of NC Manufacturing and Error Prediction Modelling Based on BP Neural Network Technology
Authors: Fan Hao , Li Hang , Si Dong Hong , Xue Yu Jun , Wang Guo Feng , Li Ji Shun
Published: August 2011

The method was proposed by use of the finite element analysis software ABAQUS and the BP neural network technology to build a synthesis error prediction model of a machining-center. Firstly the finite element model of a vertical machining center CINCINNATI ARROW750 was created by use of ABAQUS ,and the cutting force induced error was analyzed which resulted from the deformation of the machining-center’s components that was caused by the cutting force ;Secondly the geometric error of the machining-center was measured by use of the laser interometer,and the sample of synthesis error was obtained. Finally the synthesis error prediction model was obtained by use BP neural network,and through the comparison of predicted value and actual value of 25 groups of samples, the feasibility of error prediction model was verified.
The Design and Implementation of a CAD/CAE Integrated System for Plastic Injection Molding
Authors: Li Qing , Dai Li , Huang Zhi Gao , Zhou Hua Min
Published: August 2011

In the plastic injection molding process, interaction between design and analysis is very intensive. However, current computer-aided systems (CAD and CAE) are realized as isolated modules. Thus, designers need to transform data models between CAD and CAE systems. Defects of many data errors and duplicated work are inevitable. This paper presents a CAD/CAE integrated system, building on top of existing CAD and CAE systems. The framework of the system is designed. A parametric integration model is established to achieve bidirectional association between the two systems. Details of key technologies in pre- and post- processing are discussed, such as mesh generation, feature recognition, and automatic evaluation of analysis results. A practical engineering case is studied to illustrate that the system can effectively avoid mesh repair and remodeling in pre-processing, reduce the dependency on experience in analysis result evaluation, and greatly improve the efficiency of iterative design-analysis-optimization process.
Study on the Corrosion Behavior of Two Kinds of Tubing at Different Temperatures
Authors: Zhao Xue Hui , Han Yan , Li Fa Gen , Bai Zhen Quan , Wei Bin
Published: August 2011

Aimed at the problem of sulfur-resistant corrosion in environment with carbon dioxide(CO2)and trace amounts of hydrogen sulfide (H2S), Tafel polarization curves and electrochemical impedance spectroscopy techniques were employed to study the electrochemistry corrosion behavior of two kinds of 80S(A and B) at different temperatures. The methods of weight-loss，scanning electron microscope and X-ray diffraction (XRD) analysis were used to study on the corrosion behavior of the sulfur-resistant tubes, including electrochemical impedance spectroscopy , average corrosion rates and the corrosion morphologies. The results showed that the corrosion potential and corrosion rates (CR) of two samples were different with the changing of the test temperatures. With the increase of the temperature, the corrosion potential decreased, and the corrosion rates increased, but decreased at 120°C. The corrosion-resistant of A80S was slightly superior to the B80S. The serious pitting corrosion and the maximum average CR occurred at 90°C. The XRD analysis suggested that the main corrosion products were FeS.
Influence of Milling Process on Internal Stress Measurement in Thick Plate
Authors: Li Su Ming , Liao Kai , Luo Pei Yin
Published: August 2011

Layer removal method is executed by milling process, which may causes deformation and stress change of sample in aluminum alloy thick plate. Through error assessment about the experimental testing process involved milling, the milling stress layer is very thin and fail to change the whole stress dietribution of sample under some technique. Because many times of the loading - unloading operation will increase the deformation error of sample, per-depth of milling is should not be too small for the enhancement of accuracy of data fitting in stress measurement. Finaly, under the conditions of reasonable milling process and scientific experiments, influence of milling process on internal stress measurement can be ignored.
Abrasive Wear Property of Stellite190 Welding Coatings for Drill Tools
Authors: Tan Ye Fa , Wang Xiao Long , Tu Yi Qiang , Tan Hua , Zhou Chun Hua , He Long
Published: August 2011

In order to improve the wear resistance of drill tools, stellite190 welding coatings were prepared by oxygen-acetylene flame welding technology. The abrasive wear behavior and wear mechanisms of the coatings were investigated in both dry and water friction conditions. The research results show that the wear losses of the coatings increase with the increase of loads and sliding speeds. The effects of sliding speeds on wear losses of the coatings become intense with the increase of loads. The wear losses of the coatings in water friction condition are bigger than those in dry friction condition. The main wear mechanisms of the coatings are micro-cutting and multi-plastic deformation wear in dry friction condition, and accompanied by stress corrosive wear in water friction condition.
Analysis of Used Lubricant Engine Oil: SAE20W50
Authors: Amoura Meriem , Haddad Fadela
Published: August 2011

As a result of the changes that occurs the lubricant oil during their use, aged engine oils tend to differ in chemical and physical composition from virgin oil. We have chosen for study theses variations (changes) the oil that is the most sell in Algeria for cars with engine gasoline. For this investigation the oil was examined at different kilometres. A combination of oil acidity and deposit formation were used to follow the ageing. Our results were compared to standards, which helped us further refine our experiences to draw conclusions about the future for the waste oil collected.
Application of MECHATROLINK-II Fieldbus in Multi-Axis Embedded CNC System
Authors: Gao Wei Qiang , Qing Chao Ting , Hu Ze Hua , Huang Zou Ya
Published: August 2011

Recently, the application of ﬁeldbus is becoming a trend in the development of CNC system towards decentralisation, network and multi-axis linkage. It is anticipated that ﬁeldbus will be one of the leading technologies in the area of numerical control before long. Meanwhile, embedded system has been widely used in numerical control field to solve the reliability and real-time problems. In order to give full play to the advantages of embedded systems, the MECHATROLINK-II fieldbus is introduced to solve the transmission bottleneck of servo communications and multi-axis synchronous control problems. And it is proved that the application scheme combined fieldbus and embedded system is successful and valid by a large amount of performance testings.
Study on Dynamic Accuracy of CNC in Aviation Part
Authors: Du Li , Wang Wei , Song Zhi Yong , Ding Jie Xiong
Published: August 2011

Thin-walled parts are widely used in aerospace engineering. For their complexity under loading and the higher shape precision, it’s difficult for their manufacturing on high speed machine. In order to understand manufacture process, characteristic of aviation part in high speed machining is investigated. Error sources on parts are classified and the maximum error, dynamic errors are studied on its main influence factors, such as cutting force and vibration. Finally, useful method on cutting test part is proposed, which can observe and control dynamic accuracy of aviation part and ensure effective manufacture.
Study on Material Removal Mechanism of Silicon Nitride during ELID Ultraprecision Grinding
Authors: Jin Wei Dong
Published: August 2011

Based on the analyzing ultraprecision grinding process of hard and brittle materials, taking ELID grinding of silicon nitride ceramic as an example, active control technology of passivating films state was introduced in this paper. ELID ultraprecision grinding process respectively at adaptive dynamic balance mode, discontinuous electrolyzing mode and discontinuous grinding mode had been comparatively studied. By means of AFM used for analyzing surface topography of parts, studies show that material removal method for ELID grinding is always a combination of micro brittle fracture, plastic shearing, lapping and polishing action, and which is the main material removal mode depends on the actual grinding contact state. Finally, finishing surface generating mechanism for silicon nitride in ELID ultraprecision grinding was summed up.
Influence of Powder Type and Substrate Hardness on the Deposition Behavior of WC-17Co Particle in Cold Spraying
Authors: Wang Hong Tao , Ji Gang Chang , Chen Xiao , Chen Qing Yu , Bai Xiao Bo , Yang Gui Bin , Yang Feng Gen , Deng Bang Hua
Published: August 2011

In this study, the influence of particle type and substrate hardness on the deposition behavior of single WC-17Co particle during the cold spraying process was investigated. The morphology of the deposited particles was examined by scanning electron microscopy (SEM) from the particle surface and cross-sections. It was found that with increasing substrate hardness, the deposition behavior of WC-17Co particles transformed from completely embedding into soft substrate to partially flattening and even rebounding from the hard substrate. In the comparison between different powder types, spherical nanostructured WC-17Co particles experienced the more intensive deformation due to the smaller WC size.
Mechanical Design of New Type Ceramic Polishing Machine
Authors: Liu Wei , Yan Chi , Zheng Sen Wei , Tong Hui Fen
Published: August 2011

In this paper, some problems in the polishing machine have been discussed, and a kind of ceramic polishing machine was designed. For improving the rigidity and stability of machine, we used closed style as the structure of spindle. And SYZ was used to make the stock removal homogeneous. By the performance test of polishing machine we can see that the change of removal was little, but the surface roughness by ceramic polishing machine was reduced more observably than the traditional machine. The results indicate that ceramic polishing machine can process high-precision ceramic products at the low cost to satisfy the needs of production and scientific research greatly.
Using Micro-Pressing Method to Fabricate Bragg Grating on D-Shaped Optical Fiber
Authors: Hsu Chih Wei , Weng Feng Tsai , Ho Chi Ting
Published: August 2011

In this paper, we proposed a method to fabricate a D-shaped optical fiber of Bragg surface grating filter component by D-shaped fiber polishing along with photolithography、holographic interference lithography technologies and micro-molding process. The optical fiber was side-polished until it reaches the core of fiber. The master Bragg grating was first fabricated on the positive photoresister by using the holography interference lithography, then the patterned resist was used as a mother mold to transfer the pattern onto a hard polydimethylsiloxane (hPDMS)/ polydimethylsiloxane (PDMS) mold. The gratings pattern on hPDMS/PDMS was then transferred onto the UV polymer on the surface of a D-shaped fiber using a UV replication process. The transmission spectra of the resulting gratings were measured, with test results showing the transmission dip of -17dB , and 3-dB-transmission bandwidth of 9nm.
Study of Micro-Tool Wear Based on Finite Element Method
Authors: Zhang Jin Feng , Gong Ya Dong , Liu Yue Ming , Cheng Jun , Wen Xue Long
Published: August 2011

This paper presents mechanisms studies of micro scale milling operation focusing on micro cutter edge radius. To address this issue, the tool wear model is developed in the present work. Starting with an analysis of the milling edge radius of the tool, the influence of the downscaling on the edge radius is determined by analyzing the milling force. This simulation is used to predict the extent of tool wear in the same milling operation condition by increasing of the tool edge radius. This model accurately predicted the increasing of force with tool wear progress and provides the means for further study of the micro milling tool wear.
Microfabrication of Sandwich Micro-Transformers
Authors: Yunas Jumril , Burhanuddin Yeop Majlis
Published: August 2011

A new planar micro-transformer having sandwich spiral coil structure is fabricated using MEMS micro-fabrication technique. Stack interwinding coil is designed to achieve high coupling and higher winding number at relatively small coil area. In this work, stack sandwich interwinding coil structure is fabricated by bonding the substrates of the coil at connection pads using conductive epoxy material. This method replaces the use of conventional via connections that cause the most problem of current conductance in planar structures. The inductance of fabricated coil are measured at wide range of operating frequency using cascade GSG probe. The results show that the proposed technique is an alternative way in fabricating a simple and cost effective 3-dimensional structure of stack micro-transformer.
Influence of Light Leakage from Q-Switched Laser on Laser-Induced Shock Wave
Authors: Ye Yun Xia , Wu Zhong , Guan Hai Bing
Published: August 2011

Experiments were performed to study the influence of light leakage from Q-switched laser on laser-induced shock wave. Through changing the voltage applied on the Q switch crystal and the delay time between opening Q switch and triggering laser pumping source, different amount of light leakage can be obtained. It is ascertained that longer-pulse light leakage from Q-switched laser is responsible for the second weaker pressure signal appearing on the tested pressure waveform. The results show that the leakage energy not only has not beneficial effects on laser shock processing, but also will weaken the main pressure wave.
Effect of Laser Surface Modification and Tempering Process on Microstructure and Hardness Profiles of Roll Materials
Authors: Huang Gen Zhe , Li Zeng Hui , Tang Jian Yin
Published: August 2011

Laser surface modification, using a continuous wave CO2 crosscurrent laser with generated beam power of 1 kW, was performed on the adamite steel, indefinite chilled cast iron and high speed steel rolls which were applied to the industries. Optical microscopy, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and micro Vickers hardness test were applied to reveal the microstructural details and hardness profiles of the laser treated zone. The results indicate that, laser treated zones of three roll samples consist of melting zone, phase transformation zone and heat affected zone. After laser treatment, the melting zone have low hardness compared to the phase transformation zone, but after tempering at 540°C for 1 hr, the hardness at the melting zone dramatically increases, because of the formation of the fresh martensite from retained austenite. In contrast, the hardness at the phase transformation zone sharply decreases as fresh martensite changed to tempered martensite. There are many small and well distributed FeS and MnS inclusions in the melting zone at the three roll samples.
High Resolution ITO Lithography Using Excimer Laser for Flat-Panel Display Fabrication
Authors: Wang Xin Xing , Zhou Jin Yun , Lei Liang , Lin Qing Hua , Shi Ying , Mei Long Hua
Published: August 2011

As the higher and higher demand for image definition of flat-panel display (FPD), the minimum linewidth of pixel electrode, which is based on the Indium-Tin-Oxide (ITO) glass, has become narrower and narrower. The feature size of sub-pixel electrode has been narrowed from about 60~100 µm to below 20 µm in recent years. Hence the lithography technology has played a more and more important role in the fabrication of FPD. The laser projection imaging (LPI) technology can solve the problems obviously. In this paper, by using of the 351nm XeF excimer laser projection imaging system we can obtain developed pictures at the resolution between 10 and 20 µm on the ITO glass. In addition, the relation graphs between 10~20 µm linewidth and the modulation transfer function（MTF）of the projection system are simulated and analyzed by the ZEMAX and MATLAB software. Consequently, our system can satisfy the linewidth of the sub-pixel electrode at the resolution between 10 and 20 µm in the production of FPD.
Effect of Coaxial Powder Nozzle Design Parameters and the Gas Flow on the Powder Gathering Characteristics
Authors: Zhang An Feng , Fu Wei , Li Di Chen , Lu Zhong Liang , Zhu Gang Xian , Lu Qiao Pan
Published: August 2011

In laser direct metal manufacturing process by coaxial powder feeding, the interaction between powder and forming sample will occur forming jet blocked, and easily lead to rebound in metal powder nozzle clogging and pollution lens, which affects the forming process. Therefore, the powder optimizes the nozzle cone angle of the powder cavity, and the laser cavity is imported the protection gas in the axial direction. Under the function of the three-route gas (middle route gas, carrying powder gas, outer layer protection gas), the influence rule of the above parameters on the powder gathering characteristics is simulated by FLUENT, and then combined with orthogonal test, to establish the theoretical basis for the laser direct metal forming. The results show that the blocked jet, In the blocked jet, the nozzle cone angle focal length the greater is the larger the powder together, optimized parameters chooses 75°. It is guaranteed that the three-route gas outlet pressure is balanced and the powder gathering concentration is biggest, and optimized parameter: middle route gas m=0.3m3/h, carrying powder gas q=0.24 m3/h, outer layer protection gas Q=0.1m3/h.
Study on the Balancing and Improving of Assembling Line for a Type of Scanner Shell
Authors: Yao Wei Xin
Published: August 2011

The paper analyzed practical problems of scanner shell assembling lines according to the principle of line balancing. Some unreasonable arrangements of workstation and operation are improved by using some ways of industrial engineering, such as 5W1H question technology and ECRS analytical method. The results show that the efficiency of assembling line is greatly updated.
Three Dimensional Point Clouds Watermarking Algorithm Based on Sphere Degenerated Octree
Authors: Liu Jian Xin , Cui Han Guo , Dai Xing
Published: August 2011

To ensure the security and integrity of three dimensional point clouds model during transmission in the network, according to their own characteristics, after the pretreatment of PCA (Primary Component Analysis), three dimensional point clouds watermarking embedding algorithm based on sphere degenerated octree was proposed, and the octree that contained the original point clouds model was subdivided multilevel from top to bottom, and the nodes of the octree were ordered. And three dimensional point clouds watermarking extraction algorithm was proposed, and the original point clouds model and the watermarked model were registered accurately, and the occurrence of synchronization error was avoided. Experimental results showed that the presented algorithm was robust to many attacks such as rotation, translation, uniform scaling, vertices reordering, simplifying, noise and cropping under blind detection.
Reconstructing NC Program-Based Geometrical Error Compensation for Heavy-Duty NC Machine Tool
Authors: Lu Yong , Li Jian Guang , Gao Dong , Zhou Feng
Published: August 2011

Heavy-duty NC machine tool is difficult and costly to evidently improve their precision via manufacturing technology only. It is proved being an effective approach to improve machine tool manufacturing precision based on software error compensation. In this paper, an error compensation algorithm based on reconstructing NC program is discussed. Following comprehensive discussion on basic algorithm of positioning error compensation in detail, linear interpolation and circular interpolation movement error compensation algorithm are further sketched in brief. To decrease the machining error, NC program is reconstructed before actual machining. The experiment results show that error compensation methods based on reconstructing NC program can improve profile accuracy of heavy-duty NC machine tools obviously.
Research on Preventative Maintenance of Key Equipment in Discrete Manufacturing Enterprise MES
Authors: Li Hai Qing
Published: August 2011

This paper presents preventive maintenance based condition of key equipments in MES and management of job shop scheduling. A comprehensive mathematical model between multi-key-equipments preventive maintenance and job shop scheduling is offered. Assuming key equipment’s failure probability obeys the Weibull distribution and unifying the time estimation and preventive maintenance of the key equipments’ failure and decision–making of job shop scheduling, the goal of achieving multi-key-equipments’ max utilization rate is developed.
Architecture of Remanufacturing Systematic Engineering
Authors: Jing Xue Dong , Xu Bing Shi , Zhang Guo Qing
Published: August 2011

Remanufacturing is a relatively new and unknown field though it has implemented in some countries and achieved remarkable economic benefits. However this ‘Sleeping Giant’ in economy still does not attract enough attention from academe, therefore sufficient theoretical studies in this area have not been carried out. In an attempt to compensate for this gap, this paper presents the architecture of remanufacturing systematic engineering based on previous and current studies. It provides a reference for understanding and implementation of remanufacturing and further study.
Influence of Additive on High Temperature Performance of Glaze
Authors: Ma Tian Fei , Li Hong Xia , Liu Guo Qi , Yu Jian Bin , Yang Wen Gang
Published: August 2011

Using SiO2 – Al2O3 – B2O3 – K2O – Na2O system glaze as base material, adding silicon powder or alumina powder with grain size 15μm by the mass percent of 10%, 20%, 30%, respectively, melting properties of glaze were investigated. Slilica solution as binder, the anti-oxidation coating were prepared. Oxidation resistance was determined by coating to the surface of the Al2O3-C specimens. The results show that additives can raise flow temperature prominently, but has little influence on softening point and semi-sphere point; Glazing temperature ranges are obtained with different additive contents; Glazing temperature rises with addition of silicon; Glazing temperature range widens with silicon adding; Glazing temperature ranges were not strictly corresponding with softening temperature point and flow temperature point; But differences were not tremendous; glazing temperature ranges can be estimated from softening temperature point and flow temperature point. Alumina has not prominent influence on glazing temperature, but glaze forms smoothly with alumina, and oxidation resistance was good.
Evolutionary Game on the Utility Decision of the Duopoly Retailers’ Marketing Objectives
Authors: Xiao Ren Bin , Yu Rui Wu , Zhu Lin Lin
Published: August 2011

Firstly, model the evolutionary game dynamical system on the utility decision of the retailers’ marketing objectives in the duopoly situation, individuals in the same retailer group procure goods from the same supplier, and each individuals could select profit strategy or revenue strategy. Secondly, based on standard and spiteful replicator dynamic equation, use new replicator dynamical equation to study whether the equilibrium points are evolutionary stable strategies. Finally, simulate how the proportion of choosing profit strategy changes as time goes. The study shows that if the market scale meets certain constraints and the weight value of decision preference on the profit maximization marketing objective is more than 1/3, the retailer will choose profit as the marketing objective, and vice versa. The probability of the individuals competing with each other within the same group and the demand elastic coefficient don’t influence the result of the evolutionary stable strategies, but influence the evolutionary process of replicator dynamical systems.
Innovative Design of Adjustable Gauge Block in Measurement of Planeness
Authors: Zhang Shao Qun , Hua Jun , Xu Wei
Published: August 2011

the paper analyzes reason for the higher uncertainty in the planeness measurement of wood-working machine tools by leveling ruler with adjustable gauge block; proposes a new design idea of new adjustable gauge block and its measuring performance and calibration requirements; and analyzes its uncertainty of measurement.
Design and Development of Quality Information System for Electronic Ballast Based on Parameter Testing
Authors: Zou Xi Yong , Wang Bin Rui , Hu Qi , Lu Wei Kang
Published: August 2011

Parameter testing is the most important process during ballast production, only the products whose parameters conformed to the standard could be passed to the next procedure. A quality information system was designed to replace the manual operation. Based on the computer controlled auto-test facilities, the information system recorded the performance parameters of the ballasts in real time, the statistics of product quality such as the fail ratio was performed periodically. When the fail ratio exceeds the set thresholds, an alarming e-mail will be sent automatically to the related managers and designers. The adoption of database makes history data searched and reviewed conveniently, and the statistics provide a powerful tool for analysis and decision-making. Application of the system have shortened the time for defects statistics and evaluation, and helped to improve the production efficiency and product quality.
Effect of Weld Metal Hardening Property on Deformation Behavior and Crack Driving Force of Mismatched Welded Joint
Authors: Xiong Lin Yu , Zhang Yan Hua
Published: August 2011

Effect of weld metal hardening property on the deformation behavior and crack driving force of strength mismatched welded joint with crack has been investigated using finite element method under plain strain condition. The results show that when the apply load is small, there is only small scale deformation around the crack tip, the whole structure is still in linear or small scale yielding condition therefore the weld metal hardening property has no significant effect on crack driving force. As the applied load increasing, the deformation region enlarges and at the same time the deformation level around the crack tip deepens, the increasing of weld metal hardening property decreases the local deformation level, consequently leading to the decreasing of the crack cracking force.
Research on Quality Control of Clearance between Gears in Mesh Based on the Box-Cox Transformation
Authors: Shi Wen Hua , Chen Chun Liang , Niu Jin Tao
Published: August 2011

Abstract: Formerly, the research to the assembly process of gear was commonly based on the normal assumption. However, in practice the clearance between gears in mesh does not necessarily obey normal distribution. Based on the mentioned above, the non-normal process capability analysis is fulfilled with the Box-Cox transformation and the data collected in the workshop. The corresponding result is compared with the directly obtained result, which validates the rationality and effectiveness.
To Promote Entrepreneurial Education in Art Colleges with the Development of Creative Industries
Authors: Wang Xuan , Meng Ying
Published: August 2011

It explores creative approaches and methods of entrepreneurial education in art colleges from the perspective of creative industries. Aiming at the new demand of economic tendency, this paper discusses the new concept of fostering creative talents, explores a new teaching mode oriented by the research and development of creative industries, which promotes the industrialization of scientific research achievements in art colleges to boost the innovation of entrepreneurial education in art colleges and to provide educational support for the development of creative industries in China.
A Study on t Chart for Short-Run and Mixed Model Productions
Authors: Gu Kai , Jia Xin Zhang , You Hai Long
Published: August 2011

At present a wide variety of mixed products with small batch sizes is one of the manufacturing modes in modern production. It is difficult to apply traditional Shewhart’s control charts efficiently and effectively in such environments. In this paper, we propose a t chart for monitoring a process which has the characteristics of not only being short run but also with mixed product. This new t chart is used to monitor the process mean for two illustrative examples and it is shown that this chart can work effectively in short run manufacturing for mixed product.
Stress Analysis of the Working Device of Multi-Functional Excavator
Authors: Qin Song Xiang , Li Yang Lin
Published: August 2011

According to the working characteristics of working device of WDJ25 multi-functional undercover excavator, the study had calculated and analyzed the mining force of bucket rod oil cylinder and crushing force of bucket oil cylinder of full schedule theory .The force change curve accurately described full schedule working ability of bucket rod and the bucket.
Microstructure and Wear Behavior of SiCP-Reinforced Magnesium Matrix Composite by Cold Spraying
Authors: Suo Xin Kun , Guo Xue Ping , LI Wen Ya , Planche Marie Pierre , Zhang Chao , Liao Han Lin
Published: August 2011

In this paper, dense AZ91D/SiC composite coatings were fabricated by cold spraying. The microstructure and microhardness of the as-sprayed coatings were investigated. The results show that the content of SiC particles in the composite coating was 23.6 ± 7.5 vol.%. The microhardness of the composite coating was improved to 140 HV0.3 due to the enhancement of SiC particles, compared to 98 HV0.3 for the pure AZ91D coating. The wear behavior of the composite coating in an ambient condition was studied through a ball-on-disc dry sliding test system. The composite coating showed higher friction coefficient and lower wear rate than the pure AZ91D coating. The wear mechanism of the composite coating was discussed.
Error Analysis and Control of Standard Mast Section Used in Mast-Climbing Work Platform
Authors: Zhang Ke , Long Yan Ze , Chen Jian Ping , Huang Xiao Zheng
Published: August 2011

By controlling the integrated error of standard mast section, achieve requirement interchangeability for assembling.Through calculating and controlling the target of error, determined,so that provide the basis for determining the target value of manufacturing error controlling. And through special welding fixture and gauge and measuring instruments for controlling and detecting.By analyzing the qualitatively and quantitatively,applying the special welding fixture, so that the error of the manufacturing for the standard mast section is controllable.
Experimental Study on Laser Surface Cladding of Ni60 Alloy on AZ31B Magnesium Alloy
Authors: Ge Ya Qiong , Wang Wen Xian
Published: August 2011

In order to improve the corrosion and wear resistance of AZ31B magnesium alloy, Ni alloy cladding layer which had no crack and hole on AZ31B magnesium substrate was created by a 5kW continuous wave CO2 laser. The microstructure was analysed by means of OM(Optical Microscope) and XRD(X-ray Diffraction), the electrochemical corrosion and the abrasion performance were also tested by electrochemical corrosion equipment and the abrasion testing machine. The results show that: the Ni alloy cladding layer can combine with the substrate metallargically, the microstructure of cladding layer is dendritic crystal, and becomes fine significantly from the interface to surface, and the phase of the cladding layer are MgNi2、Mg2Ni、Mg2Ni3Si、Mg2Si and FeNi. Micro-hardness of the cladding layer is 470~601HV which is improved 840%~1102% to the substrate(40~50HV). Average friction coefficient of the cladding layer is 0.321 lower than AZ31B substrate, and the wear mass loss is 91.43% less than the substrate, the wear resistance of the cladded layer has been improved observably. The corrosion voltage of cladding layer moves 136~417mV to plus direction compared to AZ31B magnesium substrate, and the corrosion current of the cladding is 2~3 stages lower.
Study on the Weldability of ZG30Cr06A Needling Material
Authors: Yang Li , Qiang Ying Huai , Zang Li Li , Wang Jing , Meng Jie
Published: August 2011

ZG30Cr06A as a newly developed material is made into needling of mining machinery’s hydraulic support. Its tensile strength is up to 800MPa. In the paper, the weldability of ZG30Cr06A was thoroughly studied. The sensitivity to cold crack of ZG30Cr06A was tested by means of maximum hardness of HAZ and Y-slit type cracking test. And the variation of microstructure and properties of weld joints under different welding energy conditions was studied. The results show that ZG30Cr06A steel has a certain cold crack and hot crack tendency and a little reheat crack sensitivity in welding. Embrittlement and softening often appear in the HAZ. When the workspaces of 30mm were welded at room temperature, the maximum hardness of HAZ was up to 389HV. And the joints have a tendency to quenched hardening and bigger sensitive to cold crack. The welded joints would not produce cold crack when the preheat temperature is up to 120°C in welding. Because there is more influence of welding energy input on the microstructure and properties of joint, so in order to avoid the appearance of embrittlement and softening in HAZ and ensure weld quality, the welding energy input of ZG30Cr06A steel whose thickness is 30mm should be controlled less than 40 kJ/cm during the welding.
Investigation on Weld Induced Distortion of Butt and T-Joints Using Thermo-Elastic-FEM and Experimental Study
Authors: Sulaiman Mohd Shahar , Manurung Yupiter H.P. , Ridhwan M. , Robert N. L. , Ridzwan M.A.R. , Haruman E. , Sunhaji K.A. , Ghalib T. , Norasiah M. , Chan Y. C.
Published: August 2011

In this paper, the capability of linear thermo-elastic numerical analysis method to estimate the welding deformations was investigated. The weld induced deformation is considered as the major stumbling block that can affect the dimensional accuracy. Based on this fact, welding distortion is necessarily to be predicted, if experimental investigation becomes expensive, to minimize the negative effects, improve the quality of welded parts and finally to reduce production cost. In this study, the welding distortions on butt and T-joints with thicknesses of 4 mm and 6 mm were simulated using relatively new FEM software WELD PLANNER developed by ESI Group. The material used for the simulation was low Carbon steel. By comparing the results between simulation and experiment, it was found out that this software provided immediate solution for computational analysis time and was capable to predict the distortion within acceptable accuracy.
A 3D Coupled Thermo-Mechanical FE Model for Friction Stir Welding of 7075 Aluminum Alloy Plate
Authors: Guo Zheng Hua , Zhao Gang Yao , Ke Li Ming , Xing Li , Zhu Shun Feng
Published: August 2011

Friction stir welding(FSW), a new solid-state joining process, is wildly used in the fields of aviation, aerospace and other high technology industries for many advantages over traditional fusion welding. Computer modeling is an important tool for the prediction and optimization of the FSW process. According to the characteristics of FSW of 7075 aluminum alloy plate, a 3D coupled thermo-mechanical FE model of this process was built under the ABAQUS/explicit environment based on the solution of several key techniques, such as heat boundary condition treating, material properties definition, ALE adaptive meshing technology, etc., and validated experimentally. Then, simulation and analysis of the complex plastic deformation behavior of the process were carried out. The results show that in the stable stage of the welding, the zone of equivalent plastic deformation decreases from the top surface of weld to the bottom surface; the plastic deformation of metal ahead of the welding tool is larger than that behind the welding tool; moreover the zone of equivalent plastic deformation is concentrated behind the tool.
A Mathematical Model for the Generated Gear Tooth Surfaces of Spiral Bevel and Hypoid Gears
Authors: Wu Xun Cheng , Han Jing Tao , Wang Jia Fu
Published: August 2011

It is an important and fundamental work to establish a general mathematical model for the gear tooth surfaces of spiral bevel and hypoid gears. Based on the three-axis CNC bevel gear machine, a mathematical model with the equations of the radial position vector, the normal unit vector and the second order parameters for the generated gear tooth surfaces of spiral bevel and hypoid gears is established. The mathematical model can be used for the gear tooth surfaces generated in different types on both the three-axis CNC bevel gear machine and the cradle bevel gear machine. As an application example of the mathematical model, the generating motions of the cradle bevel gear machine are determined.
Experiment on Hot Rolling Deformation Resistance of Aluminum Alloy and Mathematical Modeling
Authors: Wang Chang Sheng , Wang Hai Xiong , Li Ji Bin , Zhang Jiang
Published: August 2011

In order to investigate the impact factor of hot rolled aluminum alloy, a experiment was finished in a factory, to determine the effects of hot-rolled aluminum alloy plate with the system deformation resistance coefficient of the various factors and to mark the influence about the temperature to the hot rolling deformation resistance; Then, established the mathematical models of 1100,3003,5052 series hot rolled aluminum alloy plate's deformation resistance; The data calculated by the theoretical mathematical models is in good agreement the measured data. So this mathematical have the importance actual significance to actual production.
Finite Element Analysis of Effects of Preheating and Postweld Heat Treatment on Residual Stress in Pipe Welding
Authors: Du Hui , Wang Dong Po , Liu Chun Xiu , Zhang Hai
Published: August 2011

To simulate preheating and postweld heat treatment of Q345 steel pipe welding, the finite element model was established. The welding process was simulated by method of the ANSYS element birth and death technique. In this paper, to obtain the distribution of the temperature field and stress field in different situations, preheating processes with two different values of temperature and postweld heat treatment process were simulated respectively. The results show that preheating can homogenize residual stress distribution of the weldment and decrease the residual stress. The heat treatment reduces the residual stress in inner and outer walls by 24% and 70% respectively and the stress distribution is more even and stress concentration is reduced.
Distributions and Influence Factors of Residual Stresses Induced by Oxygen Cutting Opening in Steel Structure
Authors: Wei Zhi Yuan , Liu Yu Jun , Zhou Bo
Published: August 2011

Oxygen cutting is the principal method for temporary hatch opening in hull structure. Residual stresses induced by oxygen cutting have a large influence on subsequent sealing and structure safety. Based on oxygen cutting theory, a heat source model was proposed with the combination of preheating flame and reaction heat between iron and oxygen, and a model was presented to simulate the cutting process on the basis of thermal elastoplastic FEM analysis, including the temperature and stress distribution. An oxygen cutting experiment was performed, in which an infrared radiation was used for surface temperature measurement. The residual stresses were measured by impact-indentation measurement. As a result, the calculation results were consistent with experiment values. The research concluded that there is a region in which the tensile stresses values exceed the yield point of material along the kerf, and the width of this region will be influenced by cutting velocity, opening dimension and longitudinal constraints.
Numerical Simulation of the Tunnel Blasting Process in Weak Intercalated Layer
Authors: Mu Chun Mei , Zhang Qing , Liu Zhi Kui , Li Wang Xing
Published: August 2011

In order to study the effect which weak intercalated layer produces in the rock during the process when explosives transferring the energy, this research uses ANSYS/LS-DYNA toexplore the numerical simulation of the law which the stress wave of weak intercalated layer rock with different thickness propagates and decays. It also compares the effect to stress wave in certain position when the thickness of the intercalated layer is different or inexistent. The outbreak pheno-menon of the rock with weak intercalated layer occurs in the blasting process is analyzed as well, so the effect of weak intercalated layer should be fully considered when arranging blast hole around the tunnel. Then the research provides the theoretical basis for selecting blasting parameters.
Study on Production Mechanism of End Concavity in Cross Wedge Rolling
Authors: Wei Xin Hong , Shu Xue Dao
Published: August 2011

End concavity controlled effectively is one of important factors to achieve no material loss end of workpiece in cross wedge rolling (CWR). In the paper, nonlinear finite element modeling(FEM) for the process of CWR is presented with the aid of DEFORM software. The production mechanism of concavity on the end of rolled-piece is analyzed by displacement method, grid method and axial strain method. The reason of concavity is obtained that the surface metal flows faster than the center and the metal deformation in axle is uneven. The study is significant to avoid end concavity and realize no material loss end for rolled-piece.
Study on Cutting Less-Teeth Gear with the Slotting Tool
Authors: Wang Bao Min , Cheng Wei , Zou Ying Kang , Li Peng
Published: August 2011

In this paper, firstly, the common equation of involute gear profile was derived with the slotting tool, based on the principle of Envelope Method & Coordinate Transform. Secondly, different equqtions of the involute and transition curve were solved with different gear profiles of slotting tool through some mathmatical substitution. Finally, the model of gear profile equation was bulit with the software Pro/E. After verification, it proved that all derived equations, which can be used to establish the accurate 3D model of gear, are correct.
Design and Simulation Analysis of Aircraft Dynamic System
Authors: Yan Qun Min , Zhu Juan Juan
Published: August 2011

Aircraft dynamic systems digital simulation platform modeling was construct based on engineering needs and provide the basis of experimental data. Combined with dynamic system characteristics and saber software characteristics .In the Saber simulation software, used the schematic-based, based on functional requirements and the modeling method based on experimental data to establish a dynamic system of different parts of the device model, and according to different modeling methods established by the electrical load model and control model of power systems consisting of mixed-signal model. Finally, experimental verification of the whole system model, simulation results compared with the experimental results prove the accuracy of the system model, effective and practical.
Rolling Force in Hot Rolling of Large Rings
Authors: Wang Min , Zhang Chun
Published: August 2011

For hot rolling of large rings, determination of rolling force plays an important role in designing, choosing and optimizing of processing plan and rolling mill. The average shape parameter of the deformation zone of ring rolling is presented, and a reliable coupled thermo-mechanical three-dimensional (3D) finite element (FE) model for the process is developed. The effects of processing parameters on rolling force during hot rolling of titanium alloy large rings with different sizes are explored and the results obtained show that different rings follow a similar trend: increasing the relative reduction or rotational speed of the driver roll, or decreasing the feed rate of the idle roll is beneficial to a reduction in rolling force.
The Effect of Particle Concentration and Magnetic Field on Tribological Behavior of Magneto-Rheological Fluid
Authors: Song Wan Li , Lee Chul Hee , Choi Seung Bok , Cho Myeong Woo
Published: August 2011

In this paper, the effect of particle concentration and magnetic field on the tribological behavior of magneto-rheological (MR) fluid is investigated using a pin-on-disc tribometer. The wear loss and friction coefficient are measured to study the friction and wear properties of MR fluid. The morphology of the worn pin is also observed by scanning electron microscope (SEM) in order to analyze the wear mechanism. The results obtained in this work show that the wear loss and friction coefficient decrease with increasing particle concentration under the magnetic field. Furthermore, it is demonstrated that the magnetic field has a significant effect on improving tribological properties of MR fluid, especially the one with high particle concentration. The predominant wear mechanism of the MR fluid has been identified as abrasive wear.