bluuebunny/crossref_metadata_2025 huggingface dataset:
Surface Characteristic and its Mechanism of the Drilled CFRP
Authors: Quan Yan Ming , Sun Lu Hua
Published: November 2012

The drilled surface characteristic of epoxy resin reinforced by multi-directional carbon fibers is investigated based on experiments. With the emphasis on the effect of fiber direction, the mechanism of inhomogeneous surface topography is discussed. Besides, the mechanism of drilling-induced delamination and splitting defects are analyzed, and the drill condition and drilling parameters are also considered. It is indicated that the varied fiber direction is the main cause resulting in the inhomogeneous topography; delamination is easy to occur between two adjacent laminas which have different fiber directions, and it is more serious near the exit of drilled hole.
Design Methods of Pine Furniture
Authors: Tang Li Hua , Liu Wen Jin
Published: November 2012

Pine furniture is becoming increasingly popular among customers. With the aim of improving pine furniture design and manufacturing, this paper analyzes the basic material properties of pine, such as the color, the texture, the shape and the structure of its parts. The technical design methods for the framework, panel, and shelf structures are also discussed. The fundamental principle on the style and design method of pine furniture is summarized. The results show that the influence of the knots and flaws, the turpentine and moisture content, the paint decoration and colors, the textures and veins, the shape characteristics of furniture parts, the basic structure forms of furniture units, and the connection methods significantly great affects pine furniture design. According to the basic design principles and methods, designers can obtain fine pine furniture.
The Study of High Speed Micro-Drilling Performance and Machining Quality of Coated Micro-Drills with Zr-C:H Coatings
Authors: Kao Wen Hsien , Su Yean Liang , Yao Sun Hui , Huang Hsi Chuan , Chen M.S.
Published: November 2012

The Zr-C:H coatings with various C2H2 flow rate were deposited on micro-drills (a diameter of 0.2 mm) used a closed field unbalanced magnetron sputtering system. The ultrahigh speed (drilling speed of 160000 rpm) through-hole drilling printed circuit board tests used to evaluate the drilling performance of the coated micro-drills. The rejection criteria of service lives of the coated micro-drills were evaluated using two different criteria: (1) a nail head ratio greater than 1.5; (2) a drilled hole surface roughness greater than 25.4 μm. Adopting a service life criterion of a nail head ratio of 1.5, the Zr-C:H-5 coating possesses the optimal high-speed machining performance, which yields a micro-drill lifetime of above 6000 drilled holes. It represents a three-fold improvement on that of an uncoated micro-drill and it also improves machining quality.
The Orderly and Direction Study of Grinding Wheel Grits Based on Geomorphologic Feature
Authors: Cao Xi Jing , Zhang Ke Peng , Zhang Ming
Published: November 2012

At present, CNC grinding efficiency has been low, the main reason is the grinding tool-grinding wheel. The service life of grinding wheel is an important element for restricting the grinding efficiency, and the main reason for affecting grinding wheel service life is the distribution of the grinding wheel grits. The chaotic distribution of grinding wheel grits reduces grinding efficiency. This paper analyzes the physical and chemical characteristics of the CBN grits, puts forward that through adding the magnetic field method in the process of electroplating wheel, changes the position and posture of CBN grits on the grinding wheel base body, and makes its an orderly distribution. And thus this method greatly improves the grinding efficiency and service life of the electroplating CBN grinding wheel.
Grinding Characteristics and Mechanism of Ceramic Alumina Wheels on Aeronautical Alloys
Authors: Zhang Hong Xia , Chen Wu Yi , Fu Xiu Zhuo , Huang Li Xia
Published: November 2012

The present investigation was dedicated to elucidate grinding characteristics during surface grinding of titanium alloy(TC6) and high temperature alloy (GH2132) by using silicon carbide(SiC) and sol-gel (SG) wheel respectively. The grinding characteristic of SG wheel on aeronautical alloys was studied on the base of systematical measurement of the grinding force, grinding temperature, surface roughness and grinding ratio. The results indicated that the SG grinding wheel possesses excellent grinding properties and is more suitable for grinding these aeronautical alloys compared with conventional abrasive tools. Finally, the grinding mechanism of new-typed SG wheel was unveiled on the base of the microcrystalline structure analysis of SG grains.
Study on Free Shaving for Worm Type Shaving Cutter of Open Groove
Authors: Cai Shan Le , Cai Yan Wei
Published: November 2012

In order to solve the problem of tooth concave error appeared in the shaving course of non-modification disk-shaped shaving cutter, the worm type shaving cutter of open groove is studied. Firstly, the basic structure of the shaving cutter and the manufacturing process will be introduced in detail. The angle of front cutting edge is -30 ° or 30 °, and then the coincidence degree is approximately equal to 2, when the tool cut the gear in the direction of the oblique angle. Secondly, the tooth profile precision will be able to be achieved though circular grinding method based on both sides of the worm. Finally, the free shaving principle is discussed by analyzing the shaving movement, the drive speed and the cutting speed. According to the shaving gear experiment, the results show that the tooth precisions reach to the 6 grades.
Swing Mechanism for Micro EDM Drilling of Fuel Jet Nozzles
Authors: Tong Hao , Li Yong , Zhang Long
Published: November 2012

To improve the spray effects of fuel-jet nozzles, the deep micro-holes of the nozzles require taper angle 0°-2° along jet direction. In this paper, a taper-swinging mechanism (TSM) is designed to swing a taper angle on an electrode wire for micro electrical discharge machining (EDM) of micro-taper holes. The features of TSM are as follows. First, the electrode wire and its guider are swung simultaneously during the micro-EDM drilling. Second, the center of a fixed sphere as the taper vertex is positioned on the surface of workpiece. Thirdly, non-rotating of the electrode wire and the fixed center avoid the errors of the swing motion. The taper holes with the corresponding angles of 0.12°, 0.40°, 0.83°, and 1.32° were machined by using TSM. The batch production showed that the consistency accuracy of holes’ diameters reached 4μm. In addition, the TSM was applied in a micro EDM machine tool.
Tool Path Calculation Based on the Actual Tool Profile
Authors: Zhao Ping , Zhao Wen Zhen , Duan Zhen Yun , Zhao Wen Hui
Published: November 2012

Due to tool wear and making errors, calculating the tool path based on the tool theory model has a great deal of influence on the accuracy of surface finishing machining. In order to solve the above problem, a photogrammetry method is used to extract the rotary cutter profile, and then the tool surface is get by letting the fitting profile curve revolves about the cutter axis, finally the cutter contact path is obtained based on the minimal orientation-distance algorithm. Experiments prove the cutter contact path is just on the theory surface of the workpiece. Therefore the accuracy of surface finishing machining will be greatly improved by the method.
Research on Vibration Drilling 1Cr18Ni9Ti Stainless Steel Micro-Hole
Authors: Zhang Peng , Jing Yan , Guo Xing Yu
Published: November 2012

The austenite 1Cr18Ni9Ti stainless steel is one of difficult-to-cut materials. It has poor dilling process, especially for micro-hole machining. The main reasons are the tiny drill, poor rigidity, easy to deviation. Moreover, the chip is difficult to discharge, so the drilling force is increased and the drill bit is easy to break, or even it is impossible for micro-hole drilling. In this paper, the vibration drilling process is adopted. The vibration drilling 1Cr18Ni9Ti stainless steel micro-hole process mechanism is researched. The stainless steel micro-hole drilling experiments are conducted. The results show that the vibration drilling can be a better solution for 1Cr18Ni9Ti stainless steel micro-hole processing.
One Effective Solution of Hot Swap Application
Authors: Zhang Zhan Jun
Published: November 2012

In the paper, mainly introduce one new solution for power and signals hot swap function. The solution is not need special connector, as slotting jack and special insert way, only use the normal connector, such as simple board to board connector. Even board to wire connector, could mount the slave on the host or place slave horizontally with host, so the inserting or plugging way is flexible. This need design one protect circuit for this effective solution of Hot Swap Application.
Application of Pre-Mixed Abrasive Water Jet Technology on Cutting Brazilian Disc
Authors: Zhang Dong Su , Cheng Gan Lin , Deng Jian
Published: November 2012

High pressure water jet technology is a new technology, its applications are increasingly widespread, by analyzing the advantages and disadvantages of the existing processing methods and the degree of difficulty that processes the Brazilian disc specimen (Brazilian disc), in order to get high quality of the incision and tiny slit width,it was used in the process of cutting Brazil disc specimens can be better cut quality,we put forward utilizing the pre-mixed abrasive water jet to cut requiring Brazilian disc, cutting test showed that the premixed abrasive water jet cutting machine tools is more easily to meet the test requirements of machine processing test, and obtain the reasonable cutting parameters the entire process is fully automated, by the preparation of CNC program, we can completed Brazil disc of processing at one time,saving a lot of manpower and material resources, so pre-mixed abrasive water jet cutting machine apply to cut Brazil disk has good application prospect.
Study of a Electromagnetic Weft Insertion in Textile Machine
Authors: Luo Sheng Mei , Zhang Bo , Tian Le , Ma Zhi Hong
Published: November 2012

Based on the in-depth study of traditional weft insertion apparatus, the electromagnetic technology was introduced into the textile machines. A new textile machine was researched whose shuttle was moved by the electromagnetic force. The electromagnetic force was generated by electromagnetic coil. The electromagnetic shuttle was moved fast in the shuttle path by the electromagnetic force. Through this technique, the weft insertion movement was accomplished and a defect was remedied that aroused by the traditional weft insertion apparatus. The weaving question which is width of cloth was solved by the new technique. At the same time, the structure of electromagnetic weft shuttle and the working which is the single shuttle and two weft was designed. The speed impact factors of electromagnetic shuttle was study in the angle of mechanics. The control method is the acceleration in the first half and the deceleration in the second half.
Optimization of EBW Parameters for 2219 AL-Alloy Using Grey Relation Method
Authors: Sobih Mohamed , Elseddig Zuhair , Almazy Khalid , Youssef Amro , Sallam Mohamed
Published: November 2012

Aluminum alloys are the subject of increasing interest in the automotive, as well as aircraft industries. Concerning the assembly, welding was extensively applied in the car industry. Nevertheless, welding defects generated during the process result in reduction in strength of both the weld; and heat affected zone which could limit its applications. Electron beam welding (EBW) has unique advantages over other traditional fusion welding methods due to its high-energy density, deep penetration, large depth-to-width ratio and the resulting very small heat affected zone. Optimization of EB welded joint of 2219 Al-alloy, from the yield strength, hardness and bead geometry point of view, is the topic of this study. Taguchi methodology with grey relation analysis has been applied to find the optimal welding parameters for welding of a sheet of the mentioned aluminum alloy with electron beam. The optimal welding parameters have been selected and verified experimentally.
Micromechanical Modelling of Elliptic Vibration-Assisted Cutting of Unidirectional FRP Composites
Authors: Xu Wei Xing , Zhang Liang Chi , Wu Yong Bo
Published: November 2012

Fibre-reinforced polymer (FRP) composites have been widely used in industry. However, the machining of FRP products is difficult, because of very different properties of the fibres and matrix. This paper discusses the development and implementation of a microstructure-based three-dimensional finite element model for the elliptic vibration-assisted (EVA) cutting of unidirectional FRP composites. The results showed that the EVA cutting has a good potential to the machining of FRP composites, featured a much reduced cutting force, better surface integrity and controllable chip size.
Numerical Simulation on Diffusion Wear of Diamond Tool in Cutting of Ferrous Metals
Authors: Zhou Ming , Zou Lai
Published: November 2012

The details of the process with respect to tool wear mechanisms in diamond cutting of ferrous metals are still not clear. For the sake of further studying on diffusion wear of diamond tool, as a consequence, the numerical simulation of diffusion process at interface of diamond and workpiece is presented based on Fick’s second law in this paper. The diffusion model of carbon atoms diffusion into γ-Fe has been established in terms of materials science theory. In addition, the distribution of carbon atoms concentration in regard to the variable of diffusion distance and diffusion time is calculated by numerical simulation, the tendency of concentration distribution is consistent with the results of previous studies. This work provides a basis research for diffusion wear in diamond cutting of ferrous metals.
5-Axis Virtual Machining Technology Research on Integral Impeller under PROE and Vericut Environment
Authors: Xia Yu
Published: November 2012

Adopt software Proe 5.0 to create model and processing technology planning of integral impeller, This paper is to establish an NC processing plan integrated with modeling, programming, simulation and optimization, taking the integral impeller as an example and combining the CAM system of software Proe 5.0 and 5-axis simulation module Vericut7.15. By the above plan, the more proper NC processing method can be got, the processing technology will be improved, and processing cost will decrease. By this plan, users can prolong the service life of the cutter, improve the surface quality, shorten the production cycle and enhance the utilization rate and productivity of the lathe. establish detailed machining plan, perform 5-axis linkage CNC programming and generate NC program for integral impeller. Modify and optimize the error existed in the NC program generated by Proe 5.0 under Vericut 7.15 environment. Achieve virtual machining of impeller parts and provide method and basis for actual machining on machine by combination of Vericut 7.15 and Proe 5.0.
An Approach to Determine Clamping Forces and Clamping Sequence of Thin-Walled Workpiece during Milling Process
Authors: Zuo Xiao Yan , Li Bei Zhi , Jiang Xiao Hui , Yang Jian Guo
Published: November 2012

The clamping force and clamping sequence in the process of thin-walled parts is an important factor affecting the quality of the workpiece. This article focused on solving the parts clamping force of the locating point and clamping sequence, according to the process of clamping force on the workpiece, by the means of screw theory and the minimum modulus principle, taking the contact friction into account, the article established a mathematical model. Furthermore, a new approach to optimize clamping and clamping sequence has been put forward combining Matlab optimization toolbox, which provided guidance basic theory for the preload design of the clamping process and flexible clamping. Finally a detailed discussion was conducted to the calculation of clamping force and clamping sequence by using some practical examples.
Application of Error Analysis Method in the Complex Vehicle Model
Authors: Liao Shui Rong , Yang Tao
Published: November 2012

A two degree of freedom input vehicle model is set up. Based on driver modeling analytical method of error analysis, step signal is taken as the input of steering angle to complex vehicle model based on CarSim, vehicle lateral acceleration is taken as as output. Meanwhile, the same steering wheel angle is taken as input as equivalent two degrees of freedom vehicle model, vehicle model parameters are optimized based on the minimum objective function. The results show that, in the same kind of speed, for steering wheel angle step input and sinusoidal input , when the input amplitude increases, the equivalent accuracy of the complex vehicle model and two degrees of freedom vehicle model will be reduced.
Study on Engine Characteristic Curves Drawing Method Based on BP Neural Network
Authors: Guo Cui Xia , Liu Kang , Xie Wen Ling , Zhou Shun Yong
Published: November 2012

The BP neural network model based on PSO particle swarm optimization algorithm is analyzed in this paper. The engine speed and torque is the input of the network and the fuel consumption rate is output. Appling PSO algorithm to optimize BP neural network weights and threshold value, which makes the BP network having high precision nonlinear mapping relation, and then realize it by MATLAB software. Practice proves that the method is effective and it provides a new method of rendering engine characteristic curve fitting.
A Heuristic Algorithm for Flowshop Scheduling Problem
Authors: Tang Dan , Shu Hong Ping
Published: November 2012

Flow Shop Scheduling Problem is a class of scheduling problems with a work shop in which the flow control shall enable an appropriate sequencing for each job and for processing on a set of machines in compliance with given processing orders. In this paper, we propose a new heuristic algorithm based on the analysis and research of which problem, the new method introducing a evaluate mechanism of the relative position of any two jobs to the completion time, and the efficiency and performance has been improved .The result of simulation experiments shows that, our new heuristic algorithm has good performance, and the average quality and stability of scheduling sequences generated by new method is significantly better than other heuristic algorithm which has the same complexity.
Numerical Simulation of Gas-Liquid Tow-Phase Flow During Complex Mold Filling Process
Authors: Feng Jun Ming , Jiang Fan
Published: November 2012

In order to predict defects of a complex casting that may arise during the die casting, The numerical analysis technique of Fluent' s VOF was used to establish the filling model. Based on the case of the wheel, it is expounded that the numerical simulation of VOF was utilized in application of casting. The five groups of simulation analysis were performed under the different pouring pressure. At last the pouring pressure has a great influence on the state of filling and the filling times are little difference. The research on pouring pressure and flow field during the casting process of wheels was conducted. The results of the study show that, when the pouring pressure is about 60000 KPa, the cavity is completely filled with the molten aluminum alloy.
Simulation Study on Heat Transfer Performance of Engine Exhaust Valve
Authors: Duan Cui Fang , Li Wei , Zhang Ji Liang
Published: November 2012

The valve is a valve mechanism main component, it is to ensure that the engine obtains good economic performance,dynamic performance, reliability and durability important parts. A lot of practice indicate, thermal overload is the cause of the failure of valve is the main reason. This paper conducts a simulation of working process of the R3105T3 four － stroke diesel engines of Shandong Weituo Group Co.Ltd.as an example with the Matlab analysis software.Through the simulation, indictor diagram and transient heat transfer coefficient are computed .It proposes a simulation method to compute heat transfer and deformation of the exhaust vavle.And with this method, it can predict the engine indictor diagram and describe the heat transfer situation of the exhaust valve as well as temperature distribution. So it can prevent losing efficacy of the exhaust vavle by choosing resonable related parameters. Meanwhile this article conducts heat transfer simulation and analysis of the exhaust vavle under different working conditions.
The Research on Characteristics of Movement Coupling in Forging Manipulator
Authors: He Jing Fei , Xu Chao , Deng Hua , Han Long
Published: November 2012

Heavy-duty forging manipulators play an important role in extreme manufacturing. Based on the kinematic model of DDS forcing manipulator, the input- output relation equations in terms of position are derived. According to the actually movement path of output mechanism, a new decoupling concept is defined as to forcing manipulator. The input-output relation matrices in terms of velocity are established at three major motions, and the coupling characteristics of mechanism are analyzed. At last, the theory analysis is proved correct by experimental verification. The results show that three major motion mechanisms of DDS forcing manipulator are partially decoupled under the new decoupling concept compared with the conventional one, which helps to simplify the control strategy of DDS forcing manipulator.
Study on Security Analysis and Management of Motor Based on Fuzzy Theory
Authors: Lu Hua Chen
Published: November 2012

Technique problems on motor security analysis and management are solved based on fuzzy theory. Combining such theory with present research of car engine structure and its related technique, based on abroad investigation of car engine malfunctions, index system suitable for motor engine security analysis is developed and fuzzy theory, a mature theory in the management science is induced in the security analysis. In the study, method and techniques for car engine security analysis and management are proposed. The real case proves that this index system and analytical technique are applicable, the analytical result could be used as theoretical references for security management, production manufacture and improvement, it could be used for analyzing similar automobile products.
CAD Modeling of Part Assemblies Using Reverse Engineering Technique
Authors: Pescaru Roxana , Oancea Gheorghe
Published: November 2012

This paper aims to highlight the utility of implementing the Reverse Engineering Technique in designing assembly parts in the field of industry. Starting from the iconic part models the project begins with the specific stages for Reverse Engineering technique, the part digitization by means of a 3D scanning system, followed by the reconstruction of the solid type parts, and ending with their parameterization. Parameterization is of great importance especially in what concerns the automated obtaining of the part models, since this allows updating the solids along with the change of parameters. In this paper it will be also presented a case study - done by means of the CATIA software package – which demonstrates the creation of parametric solids starting from physical parts for which no technical documentation is available.
Orthodontics Simulation and Finite Element Analysis of Submaxilla Dentition
Authors: Liu Dan , Qu Ai Li , Wang Chun Xiu
Published: November 2012

Objective The principle and method of the force application is researched in orthodontics field, providing the scale and location of force for clinical orthodontics. Methods Reverse engineering software is used to reconstruct a 3-D mandible finite element model, the MBT bracket and straight archwire on the dentition are modeled on it. Change the elastic module of archwire to simulate four stages of orthodontics and the displacement and stress on dentition and mandible are acquired. Results The finite element results of dentition and mandible under short Ⅱ elastics are obtained, the results show that titanium-nickel archwire may provide major displacement for dentition; O and stainless steel have good force-transmission in teeth. The stress of single tooth and mandible are symmetrical except for the position where loads are applied. Conclusions Under the short II elastics loads, bone absorption don’t appear and the bodily movement of mandible is arose.
Automobile Box Structure Optimization and Simulation
Authors: Yin Wen Long , Yang Guo Ping
Published: November 2012

This paper mainly designs several projects to analyze the deformation of crash box. Through analyzing the crushing distance, energy absorption and axial force variation, which is under different schemes and low crash speed, gets that: a front crash box slot is necessary; Filling foam allows the specimen to absorb more energy and makes the carrying capacity changing more stably. Finally, we compared simulation results with the experimental results, and on this basis, providing improvement program means.
Investigation of Fracture Criterion for HTPB Propellant
Authors: Han Bo , Ju Yu Tao , Zhou Chang Sheng
Published: November 2012

The fracture toughness of HTPB propellant has a significant rate effect. In order to establish a fracture criterion considering rate effect for HTPB propellant, experiments were conducted at different loading rates. Two kinds of specimens were used to get the fracture properties. Stress intensity factor and J-integral were obtained by the single edge notched tension specimen test. A power law cohesive zone model was obtained by the experiment based inverse method. Through comparing we found that the stress intensity factor and J-integral cannot model the rate effect in fracture process. The cohesive zone model (CZM) has a constant critical separation distance at different loading rates and has a capability to model the rate effect during the crack initiation and propagation process. A finite element simulation in ABAQUS was given to demonstrate its capability to model the crack propagation.
Abrasion Lives Simulation and Prediction of Key Parts for Breech Mechanism Based on Pro/E and ADAMS
Authors: Shao Xin Jie , Cao Li Jun , Tian Guang , Ma Qiao , Liu Jin Hua , Hu Hui Bin
Published: November 2012

Breech mechanism serves to close the breech, fire the ammunition and extract the cartridge case in firing process. In firing process, breech mechanism completes complicated actions, bears tremendous impact forces and produces huge percussive forces between components. Its major fault mode is grain abrasion caused by dry sliding friction. There are no feasible and practical technologies to simulate and predict the abrasion failure life of key parts for breech mechanism. A new simulation and prediction method is firstly put forward in this paper. Based on Pro/E and ADAMS, the virtual prototype of breech mechanism of semiautomatic vertical sliding-wedge type is established. To validate its precision and affectivity, qualitative and quantitative verification methods are adopted to check the virtual prototype of breech mechanism. Virtual prototype produces key parts’ load spectrums and failure thresholds. Dry sliding friction and abrasion experiment provides abrasion rules of typical materials. Finial simulation and prediction results are given as abrasion thresholds and operating items, which provides sufficient references for breech mechanism’s maintenance and safeguard.
3D Finite Element Analysis of Prestressed Cutting
Authors: Peng Rui Tao , Lu Fang , Tang Xin Zi , Tan Yuan Qiang
Published: November 2012

In order to reveal the adjustment principle of prestressed cutting on the residual stress of hardened bearing steel GCr15, a three-dimensional thermal elastic-viscoplastic finite element model was developed using an Arbitrary Lagrangian Eulerian (ALE) formulation. Several key simulation techniques including the material constitutive model, constitutive damage law and contact with friction were discussed, simulation of chip formation during prestressed cutting was successfully conducted. At the prestresses of 0 MPa, 341 MPa and 568 MPa, distributions of residual stress on machined surface were simulated and experimentally verified. The results indicated that residual compressive stress on machined surface were achieved and actively adjusted by utilizing the prestressed cutting method; meanwhile, within the elastic limit of bearing steel material, the higher applied prestress leads to the more prominent compressive residual stress in the surface layer and subsequently the higher fatigue resistance of the part.
Building Input File of MCNP 3D Model with Basic Graphics Exchange Specification
Authors: Chen Ai Hua , Xia Ming , Tang Yong Hui , Zhang Ying
Published: November 2012

With the help of IGES standard file which was the exchange specification of initial graphics, different CAD system could change the data of product by neutral file’s format conversing. The automatic generation of 3D-Model curve surface in the MCNP input file was realized by using VC++ language.This method has solved the problem of the complication of MCNP geometric modeling process and the 3D-Model input problem in the MCNP. The input of MCNP was transferred the application problem of CAD/CAM software. The data and figure of varies software could be shared and converted. The work of design could be simple, the process of design could be speeded up and the cycle of design was shorted. Work efficiency and practicability were improved. If precision was controlled in 3D-Model, the result could be expected by contrast.
Research on High-Pressure Water Jet Target Object Detection Parameter Optimization
Authors: Zhang Dong Su , Cheng Gan Lin , Deng Jian
Published: November 2012

By using the unique characteristics of high pressure water jet, sound test, analysis and recognition techniques combined with high pressure water jet, collecting target reflected sound signal characteristic value, then by the analysis processing, to achieve recognition for classification purposes, can form a kind of brand-new landmine detection method. For the ultimate realization of the target of effective detection and classification, it must be determined on the reflected sound signal of water jet hydraulic parameters and reasonable choice of the walking device and a signal acquisition device parameters. Effects on reflected sound signal characteristic value quality parameters include: nozzle diameter, jet pressure, nozzle and the target of target distance, jet angle and jet scanning speed. By parameter optimization, the system can complete identification of material and geometry of eigenvalue.
Research on Support Vehicles Application New Materials of Coal Mine Belt Horizontal Extension by ANSYS Software
Authors: Mao Ping Huai , Zhai Bing , Ding Li , Li Jing Xi
Published: November 2012

The support vehicles of coal mine belt horizontal extension application of new materials, is to change the traditional coal mine machinery "rough" and stupid" feature to make it more light, green and environmental protection. First introduced the horizontal extension of the overall structure of the supporting of coal mine belt which leads to support the working environment of the vehicles, then comparison of traditional materials and new materials to support the vehicle body, trying to replace traditional materials with new materials, and new materials for static mechanics and fatigue analysis, we found the support body after the application of new materials fatigue life less than ideal requirements, and thus try to use new materials to support the car body laser coating technology to improve, after ANSYS fatigue test, and validation support guide the application of coating on the car body can effectively improve the fatigue strength, has good application prospects.
Study on Simulation of the Chain Transmission Mechanism
Authors: Liu Yong Xia , Zou Shu Liang , Tang Tao , Zhou Qi Wang
Published: November 2012

The chain transmission’s feature, the main failure form of roller chain and the research for the simulation of the chain transmission mechanism are introduced. Taking the simulation of the chain transmission mechanism in feeding system of a mechanical equipment as the research object, the kinematical properties and the affecting factors are analysed in this paper. It adopts the advanced connection pair to establish relationship between the sprocket-wheel and rollers, and realistically simulates the kinematical characteristics of the chain transmission mechanism. It provides a reference for the optimization design of the structure of the chain and sprocket wheel, through the analysis on the moving velocity and acceleration curve of the chain. It also provides a basis for verifying whether the chain and sprocket-wheel meet the design requirements or not.
Force Analysis on the Opening/Closing Mechanism in the Door of Coal Hopper Car Based on the Matrix Method
Authors: Wan Chao Yan , Zhao Xu , Li Pei Xing
Published: November 2012

Based on the matrix method of the mechanism, to build the force matrices equation of the opening/closing mechanism of the door of coal hopper car. Taking the opening state as example, finishing the solution of the force of the mechanism. Using this method, the reaction of the joint and the thrust of the cylinder can be solved in any position. The results provide theoretical bases for selection of cylinders and design of the mechanism. This method can solve some complex problems easily which are difficult to the method of “first solving motion pair”. Besides that, this method can be combined with simulation and experiment to show their respective advantages. In research, satisfying result can be obtained by using all the methods synthetically.
Analysis and Simulation of Flow Field in the Ultrasonic Auto Backwash Filter
Authors: Xie Jun , Shan Li Jun
Published: November 2012

Flow field in the filter is simulated by using Computational Fluid Dynamics. At the same time, pressure and velocity field distribution in the filter are analyzed. The maximum differential pressure and filtration velocity of filter column are all decreasing with column height increasing which means that there are stagnant water zones on the top of filter column. This phenomenon not only has an effect on filtration efficiency, but also can lead cavitation erosion. So the structure of filer must be improved. The change of pressure and velocity on two sides of filtering material are caused by flow resistance of material with many holes. All theses analysis results of velocity and pressure field can be the basic theory for the design of high efficiency filter.
Sliding Wear Characteristics of High-Performance Plasma Nitrided Bearing Steel
Authors: Qu Sheng Guan , Wang Guang Hong , Liu Li Kui , Hu Yong , Li Xiaoqiang
Published: November 2012

Plasma nitriding technology was carried out on the surface of bearing steels. The phase composition and microhardness of the nitrided layer were analyzed. Sliding wear characteristics of the nitriding steel were studied on an Optimol SRV IV oscillating friction and wear tester at room temperature. The fretting wear mechanism was investigated with scanning electron microscopy (SEM) and 3D surface profiler. The results showed that Cr2N, Fe4N, Fe2 ~ 3N phases were observed on the nitrided surface layers; lubricating condition, normal load and friction velocity have great effect on the friction and wear characteristics of the plasma nitrided steels.
Microstructure and Abrasive-Wear Behavior under High Temperature of Laser Clad Ni-Based WC Ceramic Coating
Authors: Kuang Jian Xin , Wang Xin Heng , Liu An Min
Published: November 2012

The laser cladding is used on the surface of 4Cr14Ni14NW2Mo heat-resisting steel, In the laser cladding added 0. 5% CeO2,Ni-based WC coating can be formed. The effects of rare-earth oxide CeO2 on the microstructure and microhardness and wear-resistance and corrosion-resistance of Ni-based metal-ceramic coatings are investigated. Observing and analying the microstructure, Measuring microhardness, Checking the dry friction and wear properties of high-temperature of the coating in different temperature. The results showed that the microstructure of Ni21+20%Wc+0.5%CeO2 cladding layer is even small, Hardness is more uniform and gentle. Wear mechanism of the laser cladding layer changes with temperature changes.Abrasion is the main mode under Low temperature , it was transformed into Adhesive wear and Oxidation wear along with the increase of the temperature.dry friction and wear properties of high-temperature is excellent.
Failure Analysis of Axle Sleeve Made from 2Cr13 Steel
Authors: Deng De Wei , Lu Jun , Tian Xin , Zhang Cui Ping
Published: November 2012

The 2Cr13 axle sleeve, used in N52 water pumps, suffered wear after being tested for a relatively short time and fractured when it was beat under the dynamic load. Optical metallographic microscopy, scanning electron microscopy (SEM) and Vickers hardness tester for the fractured 2Cr13 axle sleeve were used to determine the most probable causes of the failure. The results showed that the failure was mainly due to the inappropriate technological parameters of high frequency induction heating and a large amplitude rotor vibration. Meantime, cracks were easily found not only close to the frayed surface but also in the inner part contributed to the inappropriate parameters. Finally, the proper protections were advised to be used for preventing this type of failure for the axle sleeve from happening again in the further.
The Finite Element Analysis of Flow Field and Temperature Field in the Molten Pool of Surface Treatment by Electron Beam
Authors: Wang Rong , Shen Guo Bin , Wei De Qiang
Published: November 2012

A finite element model was established to describe the flow field and temperature field during the surface modification by electron beam in this paper. The driving forces of molten pool were considered in the mode. The flow of liquid metal was different between the inside and outside of the beam spot; the direction of the flow was along the surface to the specimen thickness. When the liquid metal was in the bottom of the pool, it flowed along the bottom to the pool edge. The largest flow velocity was 0.28m/s in the center of the beam spot, the minimum flow velocity was 0.11 m/s in the bottom of molten pool. The temperature of sample is uniform distribution, the temperature distribution show a gradient distribution in cross section.
Atomistic Simulation on the Structure and Lattice Vibrations of Fe7-xCrxC3 Carbides
Authors: Zhang Zhen Feng , Qian Ping , Li Jin Chun , Shen Jiang
Published: November 2012

The phase stability and site preference of transition metal carbides Cr in Fe7-xCrxC3 are studied based on the pair potentials obtained by the lattice inversion method. The lattice constants and cohesive energy of Fe7-xCrxC3 with the content x are calculated. The results show that Cr atoms substitute for Fe with a strong preference for the 6c1 sites and the order of site preference is 6c1, 6c2 and 2b. Calculated lattice parameters are in good agreement with the experimental data. Moreover, the total and partial phonon densities of states are first evaluated for the Fe7-xCrxC3 compounds with the hexagonal structure. We also provide some information on the vibrational properties of transition metal carbides, such as the specific heat and Debye temperature were also evaluated.
Influence of Sputtering Power on the Structure and Photoelectric Property of Ga Doped ZnO Films
Authors: Wu Lei , Zhao Qing Nan , Wu Gang , Miao Deng Kui
Published: November 2012

Ga-doped ZnO (GZO) films were prepared on glass substrates at 523K temperature by non-reactive DC magnetron sputtering. The effects of sputtering power on microstructure and properties of the GZO films were investigated by X-ray diffraction (XRD), field-emission scanning electron microscope (FESEM), Hall effect measurements and UV-Vis-NIR spectrometer. The results show that GZO thin films exhibit high c-axis-orientation, and the intensity of peak increase as the enhanced of sputtering power; the increase of power will reduce the film’s visible-light transmittance, but for all of the GZO thin films the average transmittance of the visible-light is above 80%. The sheet resistance of GZO films decreases when the sputtering power gradually heightened from 80W to 200W. The lowest resistivity of 6.559×10-4Ω•cm can be obtained in the condition of the sputtering power is 100W, and the lowest square resistance is 7.9Ω/□.
Study on the Abrasive Wear of Chromeplate Piston Ring and Cylinder Jacket Made by Different Materials
Authors: Gao Wen Wei , Zheng Zhi , Yang Jian Ming , An Ya Qin
Published: November 2012

The abrasion of piston rings/tribomate pairs of cylinder jacket has great damage to engine, which can shorten the life of piston rings and cylinder bore, decrease the power of engine, enlarge the amount of oil, and release more pollution. Take a research of abrasive wear of piston ring and cylinder jacket made by different materials, will create a positive influence on extending the life of engine. This paper takes the SRV friction and wear tester, conducts the research on the abrasive ability of the three tribomate pairs (Cr plated piston ring and P-B, Cu-Cr-Ni-Mo and bainite cylinder bores) under the condition that there lies a certain amount of quartz sand in the lubricant and find that the hardness, intensity and tenacity of tribomate materials can have influence on its capability of resisting abrasion.
Study on the Tensile Testing Method of p-Phenylene Terephthalamid (PPTA) Fibers for Ballistic Protection
Authors: Huang Xian Cong , Zhou Hong , Li Yan , Li Chang Sheng , Jiang Yi
Published: November 2012

The purpose of this work is to study the effect of testing method on the tensile properties index of p-Phenylene terephthalamid (PPTA) fibers. Three different brand fibers were employed, namely Kevlar 129, Twaron and Heracon. The results indicate that tensile strength index is strongly affected by gauge and twist coefficient, while the influence of loading rate is minor. The ballistic performance is also evaluated according to a proposed ballistic performance index U*. The results indicated that ballistic performance is strongly affected by twist coefficient
Comparisons of Different Elastomer Micro Molds
Authors: Liu Hang , Xu Yan , Kang Chun Lei , Yung Kai Leung , Chen Wei
Published: November 2012

This paper demonstrates the comparisons of molding with micro molds made of different elastomeric polymers. Micro molds made of pure polydimethylsiloxane (PDMS), 0.3% carbon nanotube (CNT) enforced polydimethylsiloxane (PDMS), 2% carbon nanotube (CNT) enforced polydimethylsiloxane (PDMS) and commercial available high temperature silicon rubber sheet (Avon Group) were studied. Micro moldings using different molding pressures were performed. By comparing the dimensions of micro features produced with different molding pressures, molding accuracies of using micro molds made of different elastomeric polymers are obtained. Results of this study provide valuable information for the development of elastomer micro mold insert for micro injection molding.
Fatigue Reliability Updating Evaluation of Hydraulic Steel Gate Based on Bayes Theorem
Authors: Li Kun
Published: November 2012

The main objective of this paper is aim to take fatigue reliability updating evaluation of hydraulic steel gate based on the Bayes theorem. The fatigue cracks can be detected for existing structures, and fatigue reliability assessment can be updated by the nondestructive inspection. In this paper, based on the probabilistic characteristics for NDI techniques and the Bayes theorem, a fatigue reliability updating assessment model for existing steel gate components is proposed. The results showed that the fatigue reliability will increase with no cracks detected, decrease with unknown cracks detected, and change remarkably with cracks detected.
Study on Rectification Plan of the Ancient Pagoda
Authors: Zhang Jian Wei , Sheng Gui Lin , Yuan Hua
Published: November 2012

China is a civilized archaic nation, as a part of Chinese culture, ancient pagoda holds an important status in the developing history of nation architecture. With the rapid developing of the nation, we have the ability to identify and strengthen the ancient pagoda. This article has introduce the survey and progress of rectification projects about the ancient pagoda at first, carried on the narration about each kind of rectification plans, proposed the rectification idea of grout injection-horizontal digging method and concrete measures of the plan.
The Monitoring Technology Research about the Tunnel Blasting Vibration under the Complex Construction
Authors: Zhao Jiang Qian , Ju Hai Yan , Li Jian Hua , Liu You Ping
Published: November 2012

In order to ensure the safety of the blasting excavation, it must monitor the vibration caused by blast with the information technology. Based on one tunnel, the monitoring method about the tunnel blasting vibration under the complex construction is systematically studied, combining with engineering practice, the correction mathematical formulas of the blasting seismic wave attenuation are given.
To Realize the Detection and Control of Environment Temperature and Optical Intensity Based on AT89S52
Authors: Yang Tao Xiang , Bi Shi Liang
Published: November 2012

This device is designed to monitor the temperature and optical intensity in specific entironment and situation, and then to carry out the related follow-up treatment and control. The device is based on microcomputer AT89S52 to manage the information collected by the temperature sensor monolithic integrated circuits DS18B20, light intensity sensors and light-sensitive resistance. And the managed result is displayed by the man-machine interface FYD12864 . After that,the collected data is analysed and compared with the predicted data ,and then it will give an alarm when the data exceeds the provided standard..
Research and Design Optimization of Canceling Setting Invert in Road Tunnel
Authors: Xu Dong Qiang , Liu Jia , Sun Yue
Published: November 2012

Use FLAC 3D finite difference software for numerical simulation and static calculation of the different models. Study the deformation and forces condition of different model during the process of excavation. The results show that setting invert of highway tunnel in Ⅳ1-grade rock section can improve the stress state of the supporting structure and reduce the surrounding rock deformation effectively. At the same time, the flat bottom tunnel applying C25 concrete and grouting bolts could improve the integrity of surrounding rock below the tunnel sidewall. It is can be considered to cancel the setting of invert to achieve the purpose of simplifying the construction and design.
Stability Analysis of Unsaturated Soil Slopes under Rainfall Infiltration
Authors: Zhou Rong Fang , Lei Xue Wen , Meng Qing Shan , Lin Cong
Published: November 2012

The principle of effective stress based on unsaturated soil material model and the boundary conditions of rainfall infiltration on the slope are introduced. The numerical model is built according to the example, and then the ABAQUS finite element program, which is combined with fluid-solid coupling, is used to simulate the problem of transient seepage field caused by rainfall infiltration. With the powerful post processing functions ability of ABAQUS program, we can observe the variation law with the time of pore-pressure distribution and displacement field and equivalent plastic strain. Moreover, the effect on the stability of slope under rainfall infiltration is analyzed.