bluuebunny/crossref_metadata_2025 huggingface dataset:
Five-Axis Flank Milling Method of Plane Double Enveloping Hourglass Worm
Authors: Zhong Lei , Bi Qing Zhen , Wang Yu Han , Ding Han
Published: August 2011

A high-precision and efficient machining method of plane double enveloping hourglass worm is proposed. The worm tooth surface is first created and analyzed based on meshing theory. The analysis reveals that the worm tooth surface is a developable ruled surface. This provides the ability of precise flank milling of the worm tooth surface. The meshing lines on the worm tooth surface indicate the contact lines of the worm tooth and the cutter. The five-axis tool path of flank milling is then generated according to the meshing lines. The flank milling has obviously advantages in machining efficiency and surface quality, compared with the conventional end milling method. The cutting simulation and experiment validate proposed method.
Research and Development of Woodworking Curved Jaw CAM
Authors: Chen Li Juan , Zou Xiang Jun , Chen Bing Bing , Li Jing
Published: August 2011

CAM (Computer Aided Manufacturing) software, one of important aid means of numerical control machining, improves the automatic level of processing with its application in numerical control machining industry. According to the character of woodworking curved jaw (WCJ), limitations of secondary development with existing CAM software were analyzed, and the advantages and basic principles of CAM which was independent development were introduced. In this CAM, dxf files as graphic information input for WCJ. Finally, CAM for WCJ was developed with VC++ and OpenGL.
Effects of Tube Stiffness and Tubesheet Thickness on the Thermal Stress of the Tubes and Tubesheet
Authors: Li Hui Fang , Qian Cai Fu , Yu Xiao Dong
Published: August 2011

In this paper, numerical simulation was carried out for the tube bundle of a float-head heat exchanger with concentration on the effects of tube stiffness and tubesheet thickness on the thermal stress of the tubes and tubesheet. It is found that decreasing the tube stiffness by using corrugated tubes can reduce the axial thermal stress at the tubes and, thus, decrease the possibility of strength failure of the connection between the tubes and tubesheet. Decreasing the tubesheet thickness can reduce the thermal stress at the tubesheet, which is meaningful for the heat exchangers with large temperature difference between the shell-side fluid and tube-side fluid and under small pressures.
Buffer-Induced Design and Dynamic Response of Wheel Loader ROPS
Authors: Yu Xiang Jun , Yao Ming Yao
Published: August 2011

A new Rollover Protective Structure (ROPS) of the large-scale wheel loader was designed based on a buffer-induced structure. Dynamic Finite Element analysis model of the entire vehicle was created and boundary conditions of typical rollover cases were given. Optimization design of this new ROPS was obtained through a comprehensive analysis of 16 dynamic simulation samples, which were designed by Orthogonal Experimental Method. Comparison analysis of dynamic response results between original ROPS and optimal new ROPS indicates that this new ROPS effectively prolonged the duration time of the first collision and reduced the acting time of peak force. Deformation extent of main structure of this new ROPS is significantly smaller than that of the original ROPS. Buffer-induced structures can increase the kinetic energy absorption capability of ROPS. Therefore, it can reduce the possibility of brittle fracture of ROPS and improve the probability of operator survival.
Research about Numerical Control Machining of STL Files Based on Fagor CNC System
Authors: Wang Chao , Yao Yuan , Zhao Qian Sheng , Hu Qing Xi
Published: August 2011

According to the situation that surface grid models are widely used, this article summarizes the research status of numerical control machining based on Triangle facets models, introduces the STL files in detail, expounds the process of machining STL files by using Pro/Toolmaker system, designs an independent post processor for generating NC code for Fagor machine, simulates the virtual machining process through Vericut software, verifies the actual machining process on Fagor three axis CNC milling machine. Proves the method of numerical control machining based on STL files is actually feasible for planar milling、cavity milling、profile milling, Realizes the machining of STL files based on Fagor CNC system.
Preparation and Study of Cr-Nanodiamond Composite Co-Deposition
Authors: Li En Zhong , Li Jiang Cun , Yang Da Xiang , Guo Wei Ling
Published: August 2011

The preparation of electrolyte and the technical flow were summarized, the chromium based nanodiamond composite coating was prepared by composite plating process. The metallography structure of plating layer was characterzied, and the hardness, the element of plating layer were tested, the test results and reaction principle were discussed. It was found that the addition of nanodiamond increased the hardness of the coatings. When the concentration of DND in electrolyte is 2.0-3.0g/L,the plating time is about 15-20min, the maximum hardness was obtained.
Analysis of Leaf Spring’s Damping Characteristic Based on Nonlinear Finite Element
Authors: Fan Cui Lian , Li Shun Ming
Published: August 2011

In order to know about the damping characteristics of leaf spring in the actual working conditions, the finite element model was build with large deformation, interleaf friction and contact considered simultaneously. In the single sinusoidal excitation, the effects of different friction coefficient, amplitude and excitation frequency on the hysteresis and damping characteristics of leaf spring were studied. Many results were reached in the paper. It provided the references for researching the vibration characteristics of leaf spring further in the nonlinear states.
Development of Direct Slicing Software of Three-Dimensional Model Based on Pro/E
Authors: Fu Guang Meng , Chen Chan Juan , Gao Shuai
Published: August 2011

The direct slicing software of three-dimensional model which can be run in the Pro/ENGINEER Wildfire 4.0 environment is successfully developed. The method is the use of the secondary development tool Pro/TOOLKIT, which is used in Visual Studio 2008, using VC++ language to write the dynamic link library files which can run in the Pro/E environment. The software realizes not only the function that direct slicing on three-dimensional models, but also the generation of NC code file through the use of custom class on slice and the Standard Template Library which save the three-dimensional contour data of each slice.
Study on High-Precision Computer-Controlled Aspheric Surface Processing Techniques
Authors: Zhang Chuan , Wang Ping , Chen Yao Long
Published: August 2011

In this paper, two processing techniques—full parameters technique and part parameters technique—for aspheric surface grinding are expatiated. Both of them are based on the priciple of computer-controlled optical surface (CCOS) and developed from trajectory forming method. We also have carried out appropriative software to digitalize processing technology. Proved by practical process, both of them are reliable and reproducible. Full parameters technique is easy to operate, but the accuracy of surface is to large extent dependent on the accuracy of measurement; Part parameters technique can avoid these measurements, however, it has certain requirements for operator. However, its requirements are still much less than those of traditional technique.
Thermal Analysis and Optimization Design on Spindle Bearing of GSCK200A CNC Lathe
Authors: Liu Le Ping , Deng Guo Hong
Published: August 2011

Establish the three-dimensional finite element model of GSCK200A type High-speed & high-precision CNC Lathe spindle bearing, based on tribology and heat transfer theory, using ANSYS to analyze the corresponding temperature field and thermal deformation of spindle bearing in steady working state, according to this thermal deformation to obtain decrease volume of radial clearance, and the installation clearance optimization scheme is putted forward.
Design and Analysis of a Miniaturization Nanoindentation and Scratch Device
Authors: Huang Hu , Zhao Hong Wei , Yang Jie , Wan Shun Guang , Mi Jie , Shi Cheng Li , Yuan Ying Kun , Ma Zhi Chao , Yang Zhao Jun
Published: August 2011

In this paper, a miniaturization nanoindentation and scratch device was developed. Finite element analysis was carried out to study static and modal characteristics of x/y flexure hinge and z axis driving hinge as well as effect of geometric parameters on output performances of z axis driving hinge. Results indicated that x/y flexure hinge and z axis driving hinge had enough strength and high natural frequencies. Geometric parameters of z axis driving hinge affected output performances significantly. The model of developed device was established. Indentation experiments of Si and amorphous alloy showed that the developed miniaturization nanoindentation and scratch device worked well and can carry out indentation experiments with certain accuracy.
Force-Pose Nonlinear Mapping Algorithm for Assembling Micro-Mechanical System
Authors: Ye Xin , Zhang Zhi Jing , Zhang Xiao Feng
Published: August 2011

In order to precisely get the assembly statement when two micro-mechanical parts are touching, assembly methods mapping the nonlinear relationship between micro-force/torque and assembling pose are studied. The research platform is 12 degree-of-freedom (DOF) microassembly system with large-motion-range and precise-motion-accuracy. After assembly mechanism of micro- mechanical system is introduced, assembly methods utilizing both three-dimensional (3D) search algorithm and Back Propagation (BP) neural network are brought forward on the basis of micro-force/torque information feedback. In addition, two different neural network algorithms -- gradient descent and Levenberg-Marquardt (L-M) -- are further applied in the assembly process. Comparison among above algorithms was carried out in experiments, and the results indicated that BP neural networks were more reliable than 3D search algorithm in the relationship mapping process while the convergence rate of L-M algorithm was much faster than that of the gradient descent.
Dimensionning and Simulation of a Pilot Plant for Solar Hydrogen Production
Authors: Kerboua Ziari Yasmina , Ziani Lotfi , Benzaoui Ahmed
Published: August 2011

Keywords: Hydrogen, Solar, Hydrogen Production, Electrolysis, Photovoltaic Panel, Simulation Abstract. Hydrogen is regarded as the potential bearer of energy of the future. Solar hydrogen is the hydrogen produced using renewable energy, particularly solar energy [8,3]. The availability of water and hours of sunshine make Algeria a place of choice for solar hydrogen production. In this work, solar hydrogen production by electrolysis of water is considered. The required energy for water dissociation is supplied by a photovoltaic system. A design and operation study of a photovoltaic system has been done for three different regions in Algeria. The production potential is highly significant particularly in the south parts of this country.
Microstructure and Fatigue Properties of Aero Aluminum Alloy Repaired by Laser Melt Casting
Authors: Lu Chang Liang , Hu Fang You , Huang Xu Ren , Yi De Xian , Cui Ai Yong , Hu Bin , Fu Peng Fei
Published: August 2011

The paper presents a study of renovation of aerial aluminum alloy (LY12CZ) by laser melt casting with Al matrix composite powder. The microstructure of the melt casting zone was investigated, and the fatigue contrast test was carried out between the repaired specimens and the undamaged specimens. It is found that the melt casting zone consists of equiaxed crystals and columnar crystals. The equiaxed crystals distribute in the deposited layer and the crystal size is about 3~4μm. The columnar crystals whose axial direction size comes to 30μm~40μm exist near the interface with its crystallographic axis perpendicular to the interface. The fatigue life of specimens repaired by laser melt casting was shorter than no-damage specimens to a large extant, because of the flaws in the deposited layer engendered the origins of cracks; the columnar shape grains at the bottom of casting zone were easy to split under the tensile stress; the residual stress after the melt casting accelerated the initiation and growth of the cracks.
Study of Effect on Tensile Stress Test from Distortion of Fibre Laser Welded Ti6Al4V Using FEA
Authors: Fan Yu , Shipway Philip H. , Tansley Geoff , Chen Zheng
Published: August 2011

Distortion is one type of defect in the weld, which is troublesome for some reasons, especially in thin plate welding. Distortion was found in fibre laser welding processing for 0.7mm thickness Ti6Al4V plate. The purpose of this paper is to understand and evaluate the effect of distortion on stress level by FEA and tensile test. A group of 0.7mm Ti6Al4V plates welded using continuous wave fibre laser. FEA models were established for fibre laser welded Ti6Al4V in abaqus 6.7.
Instability Effect on CLC nTFTs with Positive-Bias Temperature Stress
Authors: Wang Mu Chun , Yang Hsin Chia
Published: August 2011

The positive-bias temperature instability (PBTI) test is one of effective reliability evaluation tests in negative-channel metal-oxide-semiconductor field-effect transistor (nMOSFET) to expose the bonding interface between channel surface and gate dielectric and the integrity of gate dielectric. Adopting this test metrology in thin-film transistor (TFT) on glass substrate to reveal the previous concerns is still suitable. Using this good methodology in continuous-wave (CW) green laser-crystallization (CLC) poly-Si TFT, demonstrating a greatly effective mobility 530 cm^2/V-s, is necessary to interpret the defect generation and the device degradation under high gate-voltage stress and temperature impact, 25 oC to 125 oC. Because the channel surface of the CLC poly-Si TFT was not strictly smooth, the micro roughness in this stress caused more generation of interface states. The grain-boundary trap states in poly-crystalline channel, additionally, were generated after stress.
Ablation Threshold of Sapphire by Pulsed Green Laser in Nanosecond Regime
Authors: Xie Xiao Zhu , Huang Fu Min , Wei Xin , Hu Wei , Ren Qing Lei , Yuan Xue Rui
Published: August 2011

To establish the green laser ablation process more accurately, a detailed knowledge of the exact value of ablation threshold is of great importance. Therefore, the presented paper has investigated the single pulse ablation threshold using four different methods, namely, fitting method via diameter square, fitting method via depth, micro-topography method and the one-dimensional heat conduction model. Through this research, the well-defined threshold in term of laser fluence (J/cm2) is obtained, and the comparison among different methods casts a light on the effective way to determine the ablation threshold. Also, the underlying laser-material interaction mechanism is analyzed.
Investigation of Laser Current Influence on Two-Dimensional Bar Code Contrast
Authors: Qiu Hua Dong , Lu Chang Hou , Chen Wei , Li Jian Mei
Published: August 2011

Laser current is a key parameter in laser direct-part marking symbols on a substrate. Different laser current can create enormous impact on bar code contrast, but the influencing regularities are unclear. In this paper, a new significance test method based on the multivariate nonlinear model was proposed to investigate the influencing regularities. First, the multi-element nonlinear stepwise regression model between the laser current, the laser line spacing and symbol contrast was established, and then the model significance test was employed to evaluate the influence between the two factors and symbol contrast. Finally, the influencing regularities were found by comparing the influence between the laser current and the laser line spacing. These regularities are that along with the laser current value increasing the influence of laser current on symbol contrast decreases and that the effect is much smaller and can even be neglected when the laser current reaches or exceeds a certain value. This certain value is 15 A in the Nd:YAG laser Direct-part marking symbols on the aluminum alloy experiments.
Study on Method of Determination Plastic Work Conversion into Thermal Coefficient
Authors: Li Hong Bin , Xu Shu Cheng
Published: August 2011

The plastic work temperature will increase with work piece compressing. But it is difficult to difine the coefficient of plastic work transforming into thermal energy accuraterly. In the experiment, the value of temperature rise because of plastic work could be obtained, at the experimental condition; the Conversion coeffecient of plastic work transforming into thermal energy that varys with deforming condition at the hot and high drforming rate, is usually seemed as greater than 0.95; it offers a method of determining the Conversion coeffecient of work transforming into heat and calculates it with Gleeble-3500.
Algorithm Research of Pattern Recognition for Process Control of Electrospinning
Authors: Liu Da Li , Jing Chang Juan , Liu Yuan Yuan , Hu Qing Xi
Published: August 2011

Electrospinning is kind of unique craft to fabricate nanoscale fiber in the condition of high-voltage electric field. However, due to the nanoscale diameter manufacturing, it is a challenge to get the whole manufacturing process stable at certain level. For that sake, this paper figures out the monitor method for the electrospinning equipment, which solves the former matter as well as makes the fiber generating process in control. According to the method, CCD camera is put forward to make the detection of the Taylor cone image continuously, while pattern recognition algorithm is used to real-time monitor the shape and size of Taylor cone which indicate the stable process of electrospinning. In order to get the stable Taylor cone shape, the processing result is used as feedback signal for control system of the electrospinning equipment to coordinate the feeding module or power supply module. As a result, the problem of nonuniformity and uncontrollable about electrospinning has been solved effectively; what's more, experiments testify that this method is reliable and effective.
Quantitative Modeling of the Capacitated Multi-Level Production-Inventory Problem in Petroleum Industry
Authors: Liu Guo Li , Zhao Jun , Wang Wei
Published: August 2011

This research deals with the multi-level capacitated lot-sizing problem originating from the production system of a large typical oil refinery. A deterministic mixed integer programming model based on the minimization of setup, production, transportation and inventory costs is formulated to determine the production, inventory and transportation quantities in each time period under complicated material-balance and capacity constraints. A numerical example is subsequently provided to illustrate the broad applicability of the proposed model.
Surface Modification of Poly (M-Phenylene isophthalamide) Fibers and its Effect on the Mechanical Properties of Aramid Sheets
Authors: Zhao Hui Fang , Zhang Mei Yun
Published: August 2011

In order to improve the bonding properties between poly (m-phenylene isophthalamide) (PMIA) fibers and PMIA-pulp and to improve the mechanical strength of aramid sheets, PMIA fibers have been treated with various chemical modifying agents. The surface morphology of the treated fibers has been analyzed and the mechanical properties of aramid sheets made from the treated PMIA fibers and PMIA-pulp have been investigated. The results show that silane coupling agent modification, phosphoric acid modification and nitrification/reduction modification of PMIA fibers are all helpful for improving the tensile strength and tear strength of aramid sheets, however, they have different effect on the mechanical strength of aramid sheets, and the concentration of chemical modifying agents also has considerable influence on the surface properties of aramid fibers and the mechanical properites of aramid sheets. Aramid handsheets made from PMIA fibers treated with 20% phosphoric acid have the highest mechanical strength, and the tensile strength and tear strength of them are 23.4% and 31.6% higher than that of aramid handsheets made from untreated fibers, respectively, because the treated fiber surface has more oxygenous functional groups and is more rough than the untreated fiber surface.
A Research on Remanufacturing Products Quality Control
Authors: Liu Yun , Xu Bin Shi , Shi Pei Jing , Liu Bo Hai
Published: August 2011

The quality of remanufacturing products, which is always restricting the development of remanufacturing industry, is one of sixty-four-dollar questions. By detecting the cores, process control in remanufacturing production and certificating remanufacturing products, quality control of remanufacturing products is studied. Because of cores different in original states, remanufacturing is in low-volume on the whole. Based on Bayesian posterior analysis, the paper improves the control chart and uses the previous data to monitor the production process. Finally, some advances are given to remanufacturing product certification.
Research on Technology of Process-Oriented Virtual Assembly Modeling for Product Information
Authors: Liu Zi Jian , Wan Jing Jing , Wang Ping
Published: August 2011

In order to solve the problems such as completeness and following performance of product model information in process of virtual assembly, a process-oriented virtual assembly model for product information is proposed in this paper. It applies attribute frame to constitute the mapping of geometry topology information and non-geometry information, and basis for information granularity, the structure of multi-layer representation for assembly model information is constructed by framework of tree structure. It can satisfy the requirements of representation completeness, dynamic following and real-time requirements in virtual assembly. A modeling system was established and its feasibility was verified by research result.
Improved Wear Resistance of Magnesium Alloy Irradiated by High-Intensity Pulsed Ion Beam at Lower Energy Density
Authors: Li Peng , Peng Tian Xiang
Published: August 2011

HIPIB irradiation experiment is carried out at lower energy density of 0.55 J/cm2 with shot number from 1 to 10, and dry sliding wear behavior is investigated in order to explore the low energy-modification of magnesium alloy by HIPIB. It is found that HIPIB irradiation leads to the increase in surface hardness and therefore the improvement in wear resistance compared with the original sample. The improved wear resistance is mainly ascribed to the enhanced surface hardness induced by HIPIB irradiation.
Artificial Bee Colony Algorithm for Traveling Salesman Problem
Authors: Li Wei Hua , Li Wei Jia , Yang Yuan , Liao Hai Qiang , Li Ji Long , Zheng Xi Peng
Published: August 2011

By combining the modified nearest neighbor approach and the improved inver-over operation, an Artificial Bee Colony (ABC) Algorithm for Traveling Salesman Problem (TSP) is proposed in this paper. The heuristic approach was tested in some benchmark instances selected from TSPLIB. In addition, a comparison study between the proposed algorithm and the Bee Colony Optimization (BCO) model is presented. Experimental results show that the presented algorithm outperforms the BCO method and can efficiently tackle the small and medium scale TSP instances.
Power Line Carrier Detection System Based on Virtual Instrument
Authors: Yu Min , Jin Xin Yu , Xu Cheng Gang , Zhang Yu
Published: August 2011

Low-voltage power line carrier (PLC) communication has received wide attention. However, testing standards are not well defined for PLC communication yet, and there are no professional, systematic and comprehensive detection indicators to measure and evaluate the quality of PLC communication. This paper proposed a low-voltage power line carrier communication evaluation system based on Virtual Instrument (VI). Simulation results revealed that the proposed system could precisely reflect the quality of the PLC communication.
Understanding the Enhancement of Coating's Thermal Cracking Resistance by Multiple Segmentation
Authors: Chen Xue Jun , Chen Guang Nan
Published: August 2011

In this paper, the thermal shock induced cracking behavior of a segmented coating on the outer surface of a hollow cylinder has been investigated. The driving force for the propagation of multiple segmentation crack, represented by the Thermal Stress Intensity Factor (TSIF), was determined by combination of the principle of superposition and the finite element method. The maximum TSIF has been shown to occur neither at the beginning nor at the steady state of thermal transients, but at an intermediate instant. As the spacing between multiple segmentation cracks decreases, the magnitude of TSIF first plateaus, and then decreases sharply. This quantitative mechanistic result rationalizes the experimental observations that a segmented coating can exhibit much higher thermal shock resistance than an intact counterpart, if only the segmentation crack spacing is narrow enough. Some other parameters affecting TSIF, such as segmentation crack depth and convection severity, were also discussed.
Research of Coal Mine Gas Monitoring System Based on Technology Fusion of Wireless Sensor Network and 3DGIS
Authors: Wan Xiang Yun , Yang Hao , Sun Lan Hui , Tian Hao Min , Huang Zhan Feng
Published: August 2011

At present, gas disaster is one of the main problems for Chinese coal industry. The prevention and control of gas accident is an important part of coal mine enterprise production safety. This paper uses wireless sensor network to collect the coal mine gas concentration parameter, transmits and stores the data to the server of gas monitoring system by information fusion of sink, and synchronously displays the data to the client in the state of three-dimensional space. When the gas concentration of monitored coal mine roadway is greater than the limit, the sound and light alarm will be trigged and the alarm area will be displayed. In the meantime, the information of contingency plan will be provided. The system gives a strong technical support for the early warning and controlling of gas disaster and provides a reference for the prevention of gas accidents in coal enterprises.
Cladding of Tantalum and Niobium on Titanium by Electron Beam, Injected in Atmosphere
Authors: Golkovsky Michael G. , Zhuravina Tatiana V. , Bataev Ivan A. , Bataev Anatoliy A. , Veselov Sergey V. , Bataev Vladimir A. , Prikhodko Elena A.
Published: August 2011

The aim of the work was to clad Ti-Ta-Nb coating on a substrate of pure titanium. Cladding was carried out by non-vacuum electron-beam treatment. As a result a good quality coating thickness of about 2 mm was obtained. Microstructural and microhardness tests were conducted. Dendritic structure and the borders of the former grains of β-phase were revealed. At the microlevel, the coating has a martensitic structure. The average hardness of coating is about 4000 MPa.
The Detection Method for Surface Quality of Parts Based on PCA and Wavelet Transform
Authors: Ning Xin , Ning Li Pu , Yang Bin Feng , Tian Feng , Mao Xin Hua
Published: August 2011

In this thesis, the digital figure of the defect of the casting elements is extracted by PCA. And a new method that simplifies the automatic quality detection is also brought forward. The author not only expounds the theory of PCA, the calculating method, the segmentation of digital figure and the feature extraction, but also analysis the real example to optimize the selecting of the preferences. This thesis is valuable in the real manufacture.
Development of Analysis System for the Process of Piston's Production
Authors: Wang Xiao Bo , Song Xiao Mei
Published: August 2011

Analysis for the process of piston’s production is very important for finding problems in the production chain. SPC is used to analyze the abnormity of the process according to four patterns. Due to doing with tremendous data, it’s necessary to develop a software system to help finishing analysis. The application of analysis system can reduce the probability of producing rejects.
Architecture of RFID Spatio-Temporal Data Management
Authors: Wang Yong Hui , Sun Huan Liang , Xu Jing Ke
Published: August 2011

With the development of RFID technology, we can identify, locate, track and monitor items in supply chain, retail store, and asset management applications. RFID has become a key technology in the Internet of Things. But RFID data can’t be effectively managed by only using traditional data model because they have their own unique characteristics, such as aggregation, location, temporal and history-oriented, which have to be fully considered and integrated into the data model. Therefore, the architecture of RFID spatio-temporal data management is proposed in this paper. We provide a brief overview of RFID technology and highlight a few of the spatio-temporal data management challenges, such as RFID middleware, RFID event processing, In-memory cache.
The Research of Production Process Statistical Steady-State Based on the Hypothesis Test
Authors: Wang Wei Zhi
Published: August 2011

By only applying a after the event exam in the quality control of the batch production is not enough to meet the needs of modern large-scale production. To a certain extent, modern quality control is a dynamic process of the steady-state judge and adjustment. A simple and reliable steady-state judge rule and method is the premise to guarantee the normal operation. This paper provides a quantitative method to evaluate production process steady-state by analyzing influence factors based on mathematical statistics. The method is both suitable for simple production process and complex production process with sub-processes.
Research on Materials Tracking in Toy Production Based on the Internet of Things
Authors: Cao Yu Lian , Li Wen Feng , Song Wei
Published: August 2011

The new international toy safety regulations exert tougher requirements on toy materials’ safety and traceability. This paper first analyses the production business processes and requirements in small and medium toy manufacturing enterprises. Then it proposes the architecture of the toy production material tracking system based on key technologies of the Internet of Things. The two core issues are to record material code and batch, which are significant to track the high-risk materials precisely. The system based on the Internet of Things collects data more automatically. The data collection is real-time with higher accuracy and reliability. It has practical significance in improving product quality management and realizing enterprise information construction.
Parameter Optimization of the Sheet Metal Shearing Process in the Manufacturing of Leaf Spring Assembly Using the Grey Taguchi Method and Simulated Annealing Algorithm
Authors: Gopalaramasubramaniyan Gopalsamy , Senthil Kumar V.S.
Published: August 2011

The processing of Sheet metal includes the number of process, which forms the finished product. Shearing is the preliminary process in the sheet metal processing industries. In this paper, an attempt has been made to develop an approach to predict the optimal process parameters such as Squareness and length for the Shearing process on sheet metal. The Grey based Taguchi method is used to produce the optimal level of the selected controlled factors. The Grey relational grade is calculated and the statistical analysis of variance results the significant parameters. The obtained model is further processed with the simulated annealing algorithm to get the optimal process parameter values.
Probing Active-Area Shift with Improved Kelvin Measurement for Trench DRAM
Authors: Wang Mu Chun , Yang Hsin Chia
Published: August 2011

In nano-like or nano-regime trench DRAM products, the product yield usually determines the marketing competition. Due to active area (AA) layer shift in lithography process, the cell leakage and the contact resistance at the source terminal of a cell transistor are increased. These factors will deteriorate the cell integrity in charging and access functions. To monitor this inferiority from lithography deviation, an improved Kelvin measurement and a novel pattern design were recommended. The yield improvement with this technology was really conspicuous.
Support Vector Data Description Based Multivariate Cumulative Sum Control Chart
Authors: He Shu Guang , Zhang Chuan Yan
Published: August 2011

A SVDD (Support Vector Data Description) based MCUSUM (Multivariate Cumulative Sum) chart is proposed and referred as S-MCUSUM chart, which has an advantage of distribution free. Numerical experiments on the performance of the S-MCUSUM chart is compared to the COT (Cumulative of T) chart. The results show that the COT chart is somewhat better than the S-MCUSUM chart for multivariate normally distributed data. However, the S-MCUSUM chart is much better than the COT chart for banana-shaped distributed data which is a typical non-normal distribution.
Modified Double EWMA Approach for Mixed Product Run-to-Run CMP Process Control
Authors: Lee An Chen , Kuo Tzu Wei , Lee Zeng Lien
Published: August 2011

Advanced process control (APC) has been recognized as a proper tool for maximizing profitability of semiconductor manufacturing facilities by improving efficiency and product quality. Run-to-run (RtR) process control with good quality and reliable performance for APC applications are most applicable. Chemical mechanical planarization (CMP) is part of critical processing module in semiconductor manufacturing. This paper proposes a new RtR control scheme, modified double EWMA controller (m-dEWMA), which is adaptive to the mixed product CMP processes. The m-dEWMA controller combined thread dEWMA with the drift compensation scheme to deal with the drift and shift disturbances caused by tool and products, respectively. Comparing recently mixed product control schemes: threaded EWMA controller, JADE control and threaded prediction correction controller (threaded PCC), the simulation results show that the m-dEWMA has better control performance than other controllers. The experiment results revealed that the m-dEWMA controller improves the wafer uniformity significantly in mixed product CMP process.
Interval Analysis Method of Fault Tree Based on Convex Model
Authors: Xiong Yan Ming , Li Jun , Li Shi Ling , Yang Zhan Ping
Published: August 2011

A novel interval analysis method of fault tree is proposed. Evidence theory is applied to calculate the interval probability of basic events. Convex model is applied to structure the interval operators for interval analysis, and Monte-Carlo simulation method is used to calculate conditional extreme. Simulation result demonstrates that the proposed method is coinciding with the practical applications very well, and can be applied when statistical data are incomplete.
Improving the Performance of HVOF Sprayed WC-Co Coatings Using Statistical Design
Authors: Wu Wen Tung , Jean Ming Der , Lin Jeng Der
Published: August 2011

This study reports the statistical optimization of experiments, designed by Taguchi, to improve the wear-resistance of the tungsten carbide/cobalt-based coatings applied using high-velocity oxygen-fuel (HVOF) spraying processes. In this study, a group of needlelike textures appeared in the HVOF WC-Co coatings. The structures were evenly distributed and compacted closely, showing a more dense and homogenous configuration. The coating that formed with a large amount of pores, microcracks and unmolten particles was much looser, and the interface was locally prone to defects. The coatings were obviously not homogenous. Experimental results show that the wear-resistant coatings are highly dense, with an elastic lamellar structure. The tribological properties were significantly improved and the surface textures showed uniformity, in a molten droplet flattened formation. A homogenous, morphological structure, with local small aggregation, was more obvious after HVOF WC-Co coating. Accordingly, it is clear that the surface properties determined proved favorable to the mechanical properties of the WC/Co coatings. In addition, we compared the linear models with the quadric models, using RSM methods, in all the experiments. Statistically, the linear models produced an average error of 8.285％, while the quadric models generated an average error of 1.399％. It is clear that the RSM models successfully fitted the HVOF WC-Co coating process and the quadric models yielded more accurate predictions than the linear models, in most cases. The proposed procedure was applied to HVOF spraying of WC-CO coatings. The results demonstrated its feasibility and its effectiveness in improving the HVOF WC-Co coating.
Microstructure and Properties of Carbonitride Alloying Self-Shielded Wear-Resistant Coatings by HVAS
Authors: Deng Yu , Yu Sheng Fu , Xing Shu Le , Huang Lin Bing
Published: August 2011

A kind of self-shielded carbonitride alloying flux-cored wire was developed. Wear resistant coatings was prepared on the surface of the Q235 low-carbon steel by HAVS using the wire. Detection and analysis on the microstructure and properties of the coatings were done by the equipments such as scanning electron microscope, microhardness tester and wear tester. The forming, the wear resistance and its mechanism of the coating were studied. The results show that the coating has good forming property, uniformity of microstructure and compact structure, but the coating also has large oxidate and porosity, this may due to gasforming and slagforming constituents in the wire; the coatings has high hardness, the average microhardness value reachs 510 HV0.1, and the highest value up to about 560 HV0.1; the coatings has good abrasive wear performance and bonding strength.
Output Feedback Assignability for Nonlinear Min-Max Systems
Authors: Wei Hong Yun , Zhu Zhong Xun , Tao Yue Gang , Chen Wen De
Published: August 2011

This paper investigates the output feedback cycle time assignability of the min-max systems which are more complex than the systems studied in recent years. Max-plus projection representation for the closed-loop system with min-max output feedback is introduced. The coloring graph is presented and applied to analyze the structure of systems effectively. The necessary and sufficient criterion for the output feedback cycle time assignability is established which is an extension of the results studied before. The methods are constructive in nature.
Analysis and Research of Mathematical-Physical Models on Simulation of Electrochemical Machining
Authors: Ge Yuan Yuan , Wang Fu Yuan , Zhang Ai Mei , Zhuang Su Tao
Published: August 2011

In this paper, in order to make the simulation of the whole process of electrochemical machining(ECM), the characteristic of electric field and flow field is made detailed analysis in the gap of ECM. Mathematical-physical models of ECM simulation is set up based on the basic theories of electrochemistry, electric field and flow field. And the method of model solution is discussed and researched. So the theoretical base is established of the full process of ECM simulation.
Curvature Testing the Residual Stresses in 3%TiO2-Al2O3 Coatings by Thermal Spraying Technology
Authors: Mei Fang , Gong Man Feng
Published: August 2011

Plasma thermal spraying technique was adopted to deposit five groups of different thickness 3% TiO2-Al2O3 coatings on 329-Stainless steel. A curvature method was applied to study the residual stresses. Results showed that the deformations corresponding to 3% TiO2-Al2O3/329-SS systems were serious. The residual stress changed with the ξ (ratio of coatings’ thickness to substrate’s thickness) value and weren’t constants for the coatings’ thickness 52-306 μm. No regardless of using the Stoney’ or Tomanov’ formula to calculate the residual stresses, which decreased with the ratio ξ value increased, and the thinner coatings were, the greater the residual stresses were. The coatings’ residual stresses changed with the ξ value at an exponent relation. The coatings’ thickness affects greatly on their residual stresses, especially for the intrinsic stresses. When the coatings thickness changes from 52 to 306 μm, the residual stresses were always compressive stresses. The maximums residual stresses were caused when the ξ value is 0.115 (the minimum value), and the details were -584.96 MPa and -482.78 MPa by two difference formulas, respectively.
Analysis of the Granularity of Task Decomposition in Enterprise Alliance Based on System Dynamics
Authors: Zhang Xian
Published: August 2011

The influence brought by the granularity of task decomposition on the key factors of enterprise aliance was studied based on system dynamics method. These factors includs inter-restriction, product manufacturing time, collaboration fee, Alliance leader benefit, capability and compatibility. Causality diagram and system dynamics model were established for these factors. This paper also developed a simulation program for the granularity of task decomposition based on the system dynamics model and validated the effectiveness of the proposed model by a qualitative analysis. The results show that it is a workable method to research the granularity of task decomposition in enterprise aliance using system dynamics theory.
Effect of Sample Materials on the AFM Tip-Based Dynamic Ploughing Process
Authors: Yan Yong Da , Liu Wei Tao , Hu Zhen Jiang , Zhao Xue Sen , Yan Jiu Chun
Published: August 2011

To study the effect of different sample materials on the nano dynamic ploughing process in the AFM tapping mode, the spring-oscillator model is employed to simulate the vibrating AFM tip to deform the sample surface. On the surface of different samples with the Young’s modulus of 0.2 GPa, 80 GPa and 180 Gpa, the interaction between the tip and the sample is simulated with different driven amplitudes, spring constants, tip radius and original tip-sample distances. These effects are studied. Results show that the sample with a smaller Young’s modulus is suitable for being used as the sample machined by the dynamic ploughing technique. When the Young’s modulus is greater than 80 GPa, the machine depth is so small that the machining process can not be controlled as we required.
Research on Processing Technology and Cutting Parameter of the Spiral Surface of Screw Rotor
Authors: Sun Xing Wei , Lv Guang , Wang Ke
Published: August 2011

The key components of the single screw compressor are rotor screw and two star-wheels which are symmetrical arrangement. The rotor screw and two star-wheels have composed a special spatial meshing pair. The high meshed precision is the guarantee of its excellent performance. In this paper, we will study the milling technology of screw milling cutter to the rotor screw, and establish the finite element model of the cutter, and analyze the cutter’s stress situation during the milling process, make the cutting parameters of the screw optimization, In this paper, we will also study the influence of the Milling depth and cutting width to tool in displacement and stress, in order to provide a theoretical reference of selecting of appropriate cutting parameters ,improving of processing quality and reducing wear of the tool.
Simulation Research on the Impact Mole System in Working State
Authors: Yu Xiao Lin
Published: August 2011

The structure and working principles of impact mole system were analyzed, and the dynamic simulation model of working impact mole system was built by using the theories of aerodynamics and aerothermodynamic. The Hammerhead impact mole was simulated by means of MATLAB language and its system simulation tool SIMULINK, and the correctness of simulation model was verified. The results show that the simulation approach provides the theoretical evidence for analyzing the kinetic parameters of working impact mole and its application in actual projects.
Design and Application of High-Speed Variable Pitch End Mill Based on Milling Stability
Authors: Song Qing Hua , Ai Xing
Published: August 2011

The strong demand for increasing productivity and workpiece quality in milling process makes the machine-tool system operate close to the limit of its dynamic stability. Milling cutters with variable pitch angles can be very effective in improving stability against chatter for certain speed ranges, which will be predicted by the model presented here. The present paper deals with the design of structural geometry of variable pitch end mills in detail. Based on the analysis of tooth engagement factor, which is expressed and extended in the paper, an approach is proposed to design variable pitch end mill with high milling stability. The certain speed ranges with high milling stability are given.
Estimation of Friction Coefficient Related to Squeal in Cutting
Authors: Luo Yu Jun , Gao Zhong Yong
Published: August 2011

This research focus on the squeals occurred in cutting from the views of tribology. A multi-degree-freedom model was established referring to cylindrical turning. The model was made up of two coupled subsystems — tool and workpiece which coupled through the friction between their contacted surface. The relationship between cutting squeal and friction was studied through experiments, and the coefficients of friction were estimated by experimental data. Then the tribological conditions related to squeal generating were discussed. In the end a method of reducing cutting squeal by lubrication was proposed.
Effect of Condenser Temperature and Speed on one A/C System
Authors: Pan Cheng Jun , Tang Yi Da
Published: August 2011

This study describes the results on the performance of one vehicle air conditioning system. The coefficient of performance, evaporator cooling capacity, compressor power consumption, total mass flow rate, vapor mass flow rate, liquid mass flow rate and oil in circulation, pressures and temperatures of refrigerant at every component (inlets and outlets) are measured and analyzed with the variation of the outside temperatures at the evaporator and condenser, the speed of the compressor, refrigerant charge and oil charge. The systematical experimental results obtained from this real-size test system depict the relations between the above parameters in a vehicle air conditioning system, which constitute a useful source for vehicle air conditioning systems design and analysis. The vapor quality (two-phase flow) measurements realized in this work provide an extremely important tool for diagnosing the system performances.
Foundry Technology of the Pressure Board Steel Casting Based on Proportional Solidification Theory
Authors: Yang Da Chun
Published: August 2011

For plate steel castings, the foundry technology was designed according to the dynamic directional solidification of proportional solidification theory. Adopting chilling process for the thick and large plane, it may cause the casting basically even cooling. Using self-feeding shrinkage in solidification achieved the dynamic directional feeding of molten steel, and the casting was poured and congealing at the same time. The shrinkage of finally congealing part was fed by small riser. Adopting this foundry technology, the large plane downwards avoided appearing the defects such as sand buckle, slag, pinhole porosity, and pore, etc.; the process yield was greatly increased with this foundry technology, too.