bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of the Corner Error in WEDM
Authors: Yang Li Jun , Dang Xi Nan
Published: November 2010

This paper introduced some current researches on the corner error in WEDM and put forward the factors that have an influence on the corner error. The deflection of the wire-electrode that has been caused by discharge force, feeding directions of the wire-electrode and radial flops of the guide pulley was analyzed in detail. To minimize corner errors, the energy control strategy and the trace control strategy are presented. Especially in WEDM-HS processing, the methods improving the processing precision are given as follows: Using the over-cutting and retract program, controlling the wire-electrode tension and improving the guiding and allocation parts.
The Effects of the Cooling Gallery Position on the Piston Temperature Field and Thermal Stress
Authors: Liu Jin Xiang , Wang Yue , Zhang Wei Zheng
Published: November 2010

The effects of cooling gallery position on the piston temperature field and thermal stress are studied. A finite element model of 1015 engine piston is developed using Pro/E software and finite element analyses are achieved through ANSYS code. Numerical simulations are performed to find the temperature and thermal stress change rules with regard to the cooling gallery position. The results demonstrate that the axial direction position of cooling gallery has obvious effects on the piston temperature while the radial direction position of cooling gallery affects the piston thermal stress a lot. The highest position of cooling gallery should be as the same line as the top of the first ring groove. The distance between cooling gallery and piston radial edge should be more than a certain value to decrease the temperature gradient and thermal stress concentration.
The Finite Element Simulation of Electromagnetic Powder Compaction Drive Force
Authors: Zhou Xiao , Liu Jun
Published: November 2010

In powder compaction, the great influence of the drive structure upon the electromagnetic force is a key problem to be addressed. A simulation is carried out to analyze the parameters of electromagnetic compaction drive structure by using ANSYS software. And in the two-dimensional model, the study focuses on the effects on electromagnetic pressure, which are produced by the bore and height of the coil, the radius and resistivity of the driver slice, and interval between coil and driver slice. The final results show that electromagnetic pressure of inverse correlates with other parameters of different forms and will grow slowly if the radius is increasing. On the basis of simulation, we draw the general rules of plane coil and driver slice parameter selection.
The Lapping Experimental Research Based on Multi-Unit-Lapping Plate
Authors: Hang Wei , Jiang Fan , Zhou Zhao Zhong , Dai Yong
Published: November 2010

A new process method called multi-unit-lapping plate process is proposed in this paper. This technique could reduce change of cutting depth owing to difference of grain size and protrusion height of surface abrasive of grinding plate, and near equal-cutting-depth processing is realized. For characteristics and machining performance of multi-unit-lapping, this paper reports the following studies: A new experiment was carried out with the optimal parameters and compared with the traditional plate, under the same processing conditions. The results showed that the abrasive grains cutting depth changed obviously with multi-unit-lapping plate.
The Probabilistic Method of Failure Analysis to Transmission Facilities under Ice Storms
Authors: Xu Wen Jun , Yang Hong Ming , Lai Ming Yong , Wang Shuang
Published: November 2010

Based on Extreme Value Theory (EVT), the Generalized Pareto Distributions (GPDs) of meteorological variables wind speed and freezing precipitation is simulated. Considering the dependence of them, a joint probability distribution is calculated by the Copula function. Further more, the probability distributions of ice loads and wind loads on transmission lines are analyzed, and the failure probability of broken lines and collapsed towers under ice storms is calculated. The accuracy and validity of this analytical method is demonstrated with comparison between numerical results and the historical datas of Chen Zhou power transmission systems.
The Purification Experiments of Cold Rolling Emulsion by Hydrocyclone
Authors: Ma Liang , Pan Hong Liang , Wang Hua Lin , Yang Qiang , Wang Jian Gang , Wu Shou Min , Xu De Jian , Xu Xiao Mei
Published: November 2010

This article focuses on the separation of ferrous impurities from emulsion with micro-hydrocyclone. The relationship of flow rate, pressure and separation efficiency is studied to determine the optimal operation condition. Results show the separation efficiency and the pressure difference increase with the inlet flow rate of the micro-hydrocyclone. When the inlet pressure is 0.4MPa, pressure difference △Pio is 0.26Mpa and the average inlet particle size is 2.719μm, the separation efficiency of the solid particles is 76% and the removal rate of solid particles with the size above 5.5μm is 85.64%, which contributes to the improvement of the quality of cold rolled sheet.
The Quantitative Evaluation on the Lapping Uniformity of Rotated Dual-Plates Lapping Mode
Authors: Zhao Ping , Yu Wei , Tang Ke Feng , Lv Bing Hai , Yuan Ju Long
Published: November 2010

The lapping trace distribution on ball surface is one of the key factors during the lapping process, which can affect the sphericity of lapping. The Rotated Dual-Plates lapping mode (RDP lapping mode) can achieve better uniformity of lapping trace distribution on precision ball surface, which ensure the results of forming sphere by lapping. Combining with the basic principle of RDP lapping mode, as well as the analysis of the kinematics of the RDP lapping method, this paper puts forward a basic rule about the material removal at the contact point between the ball and the plate with the material removal rate equation of bearing steel, and the improvement of the sphericity which can be simulated, and is defined as the lapping uniformity according to basic rule equation. The influence caused by the lapping pressure and the speed of the plates are considered in the simulation, the surface of ball is triangle grid divided. The uniformity of lapping is evaluated at different speed ratio, and eventually a better curve of the speed ratio can be got, so the lapping uniformity during the RDP lapping mode can finally be accurately evaluated.
Analysis on the Workspace of a Tomato Harvesting Manipulator with 7 DOF
Authors: Liang Xi Feng , Wang Yong Wei
Published: November 2010

This work presents a workspace solving approach for a tomato harvesting manipulator with seven degrees of freedom (7 DOF) based on a special envelope method. In this method, the joints of the manipulator was categoried into two groups, and the workspace boundary of each group was formulated according to the envelope equation by MATLAB and AutoCAD by considering the joint limits. To analyze the reachable and dexterous workspace, the position and orientation of the last link was plotted. The results show that the width and height of the wrist workspace of the tomato harvesting manipulator are 1.5 and 1.2m respectively, which can satisfy the tomato picking requirements. The reachable workspace and the dexterous workspace are affected by the length of the last link and the end-effector. In order to minimize the hollow in the workspace, it is necessary to choose the rational length of the 5th link and the 3rd link and the angle range of the 5th joint. The algorithm can make the workspace visualized and be applicable to all practical manipulator configurations.
The Structure Characteristics and its Product Experimental Analysis of the Cold-Rolled Production Line of Double-Line Continuous Electrolytic Pickling
Authors: Xing Bang Sheng , Du Changlun , Wang Xue Feng
Published: November 2010

The cold-rolled production line of double-line continuous electrolytic pickling is quite common in the manufacture of all kinds of small-diameter cold-rolled thread steel. This paper studies the main technology parameters, the main device with the structure characteristics and the principle of the cold-rolled production line of double-line continuous electrolytic pickling, and then analyzes on the experiments and on the technological economics for the small-diameter cold-rolled thread steel. The results show that its production line is convenient in operation, accurate in processing, efficient and adaptable in production. The small-diameter cold-rolled thread steel produced by this production line has high strength, large plasticity and good yield performance and bending characteristics. It can greatly improve the performance of reinforced concrete structure and prestress reinforced concrete structure, increases the quality of components, and saves steel about 15%. So it is a high efficiency, energy-saving steel. Small-diameter cold-rolled thread steel is widely used in the construction industry with very significant economic and social benefits, it plays an important role to accelerate the economic construction of China.
The Tolerance Modeling of LED Die Bonder Based on Multi-Body Systems
Authors: Huang Mei Fa , Huang Jiang Tai , Cheng Xiong , Zhang Jing , Jing Hui
Published: November 2010

LED die bonder is a high precision packaging machine and needs proper tolerance design to ensure its high performance requirements and low manufacturing costs. The related tolerance design methods, such as worst-case method and statistical method, mainly focus on two-dimensional cases in tolerance design. However, tolerance design for LED die bonder needs to deal with three-dimensional cases. To solve the problem, a new method for tolerance design based on Multi-body systems is presented. According to the motion characteristics of the related assembly component parts of LED die bonder, the motion equations in ideal and actual situation for die bonding are given respectively which use the principle of Multi-body systems and the homogeneous transform matrix. By solving the motion equation, we can obtain the tolerances of the related assembly component parts.
Using PSO to Optimize the Performance of Timeslot Scheduling in Mesh Wireless Network
Authors: Zhao Jin Dong , Lin Yao , Qin Jin
Published: November 2010

In IEEE802.15.4 compatible network, TDMA mechanism was used to access the medium and all nodes communicate to each other within one superframe periodically. In order to use the time slot efficiently, graph coloring algorithms are used to schedule the time slots in wireless sensor network. In this paper, the impacts of different assignments on network performance were analyzed and the result was extended to mesh topology network. The proposed data delay model was used to design a PSO algorithm to optimize the assignment schema. Finally, simulation was carried out to verify the practicability of the algorithm and the optimization effect was shown.
Virtual Assembly of Lathe Spindle System
Authors: Li Xiao Mei , Sun Hua Jiang , Zhu Li Hui
Published: November 2010

On the basis of research on the assembly process of CA6140-type lathe spindle system, the assembly relationship of its components was ascertained. Three-dimensional (3D) components storehouse of the system was established with CAD software UG6.0. On that basis, dynamic simulation software of assembly process and power transmission process of the system was developed. Running the software can reproduce assembly, disassembly and power transmission process. The software can not only be used in the analysis and transformation of old products, but also can be used replacing prototypes in developing of new products.
Virtual Design for New Type Radial Telescopic Tire Building Drum
Authors: Ni Yan Bing , Li Chang Cheng , Yang Yu Hu
Published: November 2010

According to the characteristics of radial tire technological process, a new type of tire building drum was proposed. The kinematics analysis was carried out based on the systematical study on the structure and working principle of this mechanism. And on this basis, taking passenger car tire for example, the three-dimensional solid model of the tire building drum was established, and the kinetic simulation was performed by Solidworks software. The result of simulation shows that the tire building drum proposed, with inside-outside alternating supporting shells moving smoothly, is of simple construction and can realize a great radial expansion ratio, and improve the quality and efficiency of tire building and unloading. This study can also provide reference for the innovative design of new tire building drum.
A New Method for Accurately Evaluating Planar Straightness Error
Authors: Yuan Jiang , Qiu Zi Xue , Cao Jin Wei
Published: November 2010

Because of the disadvantages in evaluating straightness error of the traditional method, such as high algorithm complexity, low evaluating precision, it can’t be appropriate for various instruments. A fast and accurate method called intercept of convex polygon algorithm is put forward to implement least envelope zone for evaluating plane straightness errors. The algorithm is based on the convex-hull theory in computational geometry, the measuring data of various instruments are firstly converted into coordinate value, then constructed the convex polygon by slope factor. The unique point meeting the least condition can be found, and the straightness error can be calculated through shear shift conversion. Experimental results show that the method is simple and easy for automatic data processing by computer, and has features of high precision and high speed.
Application of FEM Analysis to Fault Diagnosis of Cracked Rotor
Authors: Yang Kang , Yang Yi
Published: November 2010

Based on the simple crack model and the finite element method (FEM) theorem, the corresponding dynamic equation of the cracked rotor based on FEM analysis is modeled and the numerical simulation solutions are obtained. By analyzing the dynamic characteristics of cracked rotor in diverse conditions, the properties of the un-cracked rotor and cracked rotor are discussed. A valid fault diagnosis method of cracked rotor is purposed. The method demonstrates that the cracked rotor can be identified by estimating if the swing of disk center obviously accretion and appear wave crest when rotate speed is a half critical speed of rotor shaft system.
Application of Maslow's Hierarchy of Needs to Modern Chinese Furniture
Authors: Zhang Han Ning , Xu Ji Feng
Published: November 2010

Based on the analysis of Maslow’s hierarchy of needs, this study explored the method of product design which takes five levels of human needs as a starting point. By combining with the dual attributes of modern Chinese furniture on industrial product and cultural product, this research proposed a design model of modern Chinese furniture based on hierarchy of needs, which can provide with cross-references to design practice.
Artificial Intelligence Application in Modern Management
Authors: Jiang Rong
Published: November 2010

Modern management is a science of technology that adopts analysis, test and quantification methods to make a comprehensive arrangement of the limited resources to realize an efficient operation of a practical system. Simulated annealing algorithm has become one of the important tools for solving complex optimization problems, because of its intelligence, widely used and global search ability. Genetic algorithm may prevent effectively searching process from restraining in local optimum, thus it is more possible to obtains the global optimal solution.This paper solves unconstrained programming by simulated annealing algorithm and calculates constrained nonlinear programming by genetic algorithm in modern management. So that optimization process was simplified and the global optimal solution is ensured reliably.
Automatic Visual Inspection System of Gas Valve’s External Taper Thread Based on Image Domain
Authors: Zhang Xue Сhang , Zhang Xu , Lou Ying Hou , Chen Jun Hua
Published: November 2010

The failure of the gas valve’s external screw taper thread is a very serious problem which may result in accidents. Routine inspection on the threads are thus necessary. The efficiency of traditional manual testing methods can not meet the production requirements. An automatic visual inspection system for gas valve’s exteranl screw taper thread was presented in the paper. The system consists of a high-performance 200 megapixels CCD camera, a LED backlight and a holder of gas valve. Through image acquisition, image processing, edge detection and feature dimension measurement, the system can effectively measure the parameters of taper thread such as angle of thread, depth of thread, taper angle of thread on image domain. It can meet the testing requirements of the external screw taper thread and has wide application perspective.
Behavioral Characteristics Analysis and Structural Design of Conceptual Interface of Mechanical Products
Authors: Wang Ke , He Hua Bo
Published: November 2010

In conceptual mechanical design process, designers sometimes focus their attentions on mapping a sub-function or functional unit to a single mechanism or system, and ignore the interfaces among the structural elements. This paper first summarized the behavioral characteristic of the interfaces in energy, mechanics, kinematics by analyzing the roles, classification and connection styles of such interfaces. Subsequently, it introduced the concepts of function and free surface, and gave the interface design process. Finally, a case study was conducted to demonstrate the feasibility of the proposed methodologies.
Behavioral Process Characteristics of Assembly Devices and Their Conceptual Design
Authors: Shi Liang , Deng Yi Min
Published: November 2010

Assembly devices are important in manufacturing systems. To study their conceptual design methodologies, it is necessary to investigate their behavioral process characteristics. In this paper, the behavioral processes exhibited by some assembly devices were studied, from which we discovered the so-called “phenyl-loop behaviors” with some unique characteristics. Some specific rules were subsequently proposed to help identify these behaviors, and their usefulness for conceptual design was also discussed. A structure-behavior database was set up based on existing assembly devices and a design platform was constructed for assembly devices design.
Buffer Groove Design of Continuous Rotary Electro-Hydraulic Servo Motor Used in Simulator
Authors: Wang Xiao Jing , Shao Jun Peng , Yu Guang Bin
Published: November 2010

In order to improve the low speed stationary of continuous rotary electro-hydraulic servo motor and avoid the pressure impact in the sealed cavity during the oil distributing, this paper designed the shape of buffer groove, established the mathematical model of pressure gradient, and analyzed change law of sealed cavity pressure gradient under different dimension of buffer groove. The pressure field distribution of sealed cavity was studied in certain radial and axial gap, and it is validated the dimension of buffer groove is rational, which lays foundation for structure design and experimental research of large displacement servo motor.
Color Image Denoising Using Gaussian Multiscale Multivariate Image Analysis
Authors: Liang Dong Tai
Published: November 2010

Inspired by the human vision system, a new image representation and analysis model based on Gaussian multiscale multivariate image analysis (MIA) is proposed. The multiscale color texture representations for the original image are used to constitute the multivariate image, each channel of which represents a perceptual observation from different scales. Then the MIA decomposes this multivariate image into multiscale color texture perceptual features (the principal component score images). These score images could be interpreted as 1) the output of three color opponent channels: black versus white, red versus green and blue versus yellow, and 2) the edge information, and 3) higher-order Gaussian derivatives. Finally the color image denoising approach based on the models is presented. Experiments show that this denoising method against Gaussian filters significantly improves the denoising effect by preserving more edge information.
Computer Vision-Based Augmented Reality System for Assembly Interaction
Authors: He Han Wu , Wu Yue Ming , Zheng De Tao , Rao Yong
Published: November 2010

A research effort aimed at creating a computer vision-based augmented reality assembly system is presented. The architecture of this system for assembly interaction is described. To realize intuitive human-computer interaction, a computer vision-based hand tracking and gesture recognition approach is applied. This approach uses the color-based method to segment the hand from background, and locate the hand position by the marker attached on hand, and then recognizes the gesture according to the geometry constraint of human hand. In comparison with the traditional approaches, this new method does not require a stationary camera, and is not sensitive with intensity difference. So, it provides a real time performance and is easy to realize. Moreover, occlusion identification is studied in this paper to raise the real and virtual objects combination effect. Finally, a prototype system is provided to demonstrate the effectiveness and robustness of the presented approaches.
Deflection and Stress Analysis of Glass Plate in Elastic Deformation Processing
Authors: Nguyen Duc Nam , Yuan Ju Long , Lv Bing Hai , Wu Zhe
Published: November 2010

As the consumer market in the optics, electronics and aerospace industries grows, the demand of ultra-precision aspheric surface increases. The shape accuracy of the optical lens changes significantly with deformation conditions and optical properties of the lens varies with stress distribution within the lens. Therefore, determining the deflection and stress of glass lens is very important to improve the quality of the lens. In this paper, the deflection and stress theoretical results of BK7 glass plate have been presented in different cases of elastic deformation processing. The results are compared with the finite element analysis (FEA) to demonstrate the robustness and accuracy of algorithm in calculation of stress and deflection. The mentioned finite element models were established using the software Abaqus/CAE. The analytical and FEA results showed that if the edge of plate is simply supported, the maximum deflection is 4 times larger than in the fixed edge case. Otherwise if the edge and centre point of plate is simply supported, the maximum deflection is 2.5 times lower than in the fixed edge case and 11.3 times lower than in the simply supported at edge case.
Design Management and the Development of Chinese Industrial Design
Authors: Song Xi
Published: November 2010

Although Chinese industrial design has developed for over 30 years, the combination of design principles and practice could not meet the challenges of the new era. Design management could be used in reconstructing the core competence of Chinese enterprises. An atmosphere of effective communication and respect for each other is useful in achieving design objective. Design-appraising system will be eventually established by integrating design theory with practice.
Deviation Control of Weld Seam Tracking Based on Laser Image Sensing
Authors: Liu Li Jun , Lou Ying Hou
Published: November 2010

Because welding system is given the look function by laser image sensing, the automation of welding system is well improved. But the two problems are image processing deviation under welding interference and adjusting deviation of machine set tracking. Targeting at these problems, the weld seam tracking (WST) system is designed. Some mathematics are brought forward, including the log grey transformation, Laplace edge detection, extracting center route of laser strip and detecting the characteristic points of weld seam image. The dynamic trend of WST is controlled by the current seam deviation calculated by seam characteristic points. The subsection control strategy and the decision algorithm of WST stability in abnormal circumstances are used. The WST experimental results show that tracking S shape weld seam is delivered effectively with high precision based on the proposed weld seam tracking, can meet welding technology requirement and provide experimental data for manufacturing WST system.
A Research on Transition of Urban Communities and Sustainable Lifestyle in China
Authors: Zhou Xiao Jiang , Liu Xing
Published: November 2010

In the last 20 years, China has been in the radical change of urbanization. The cities have been growing fast through continual construction and demolition. This research focuses on the development of several cities in Southern Yangtze of China to investigate the change of the residents in their lifestyle, living attitude during the “demolition’’ and “construction” in the perspective of urban plan and environmental design. Through the experiments of design projects in urban plan and environmental design, solutions would be found for those disharmony problems occurred during the transition process of “demolition” and “construction”. The proposals, from both the tangible and intangible points of view, would be developed for the development of the cities and regroup of residents, as well as the reconstruction of new communities with extension of traditional custom.
Dynamic Analysis of a Calibration Mechanism
Authors: Sun De Wei , Chen Zhi Gang , Zhang Guang Yu
Published: November 2010

In order to verify the reliability of a calibration mechanism including a motion component used in the satellite, the dynamic analysis for this mechanism is conducted with modal coordinate reduction method. Firstly, FEM software ABAQUS is employed to calculate the eigenfrequency and mode shapes of this mechanism. Then, the transfer function at some key points can be acquired by coordinate transformation from its original format in modal coordinate. Finally, the power spectral density at the key points are obtained and compared with the results of random vibration experiments to prove the dynamics analytical validity.
Effect of Ultrasonic on Properties of Electroplated Diamond Tools
Authors: Wang Xiu Zhi , Yu Ai Bing , Lin Bin , Bao Ning
Published: November 2010

The nickel coatings and electroplated diamond tools were fabricated with ultrasonic and without ultrasonic condition. Hardness and adhesive strength of nickel coatings were tested. Diamond grains on tool substrate were observed with microscope. Al2O3 ceramic was machined with fabricated electroplated diamond tools to compare material removal rate and grinding ratio. Experimental results show that high hardness can be obtained under the effect of ultrasonic during tool fabrication processes. Ultrasonic agitation can make grain dense and guarantee nice contact between substrate and coating. With ultrasonic power of 200W, nickel coating presents highest values of hardness and adhesive strength. High grain density of diamond tool can be obtained. During buildup processes, some buildup time is needed to obtain enough thickness of nickel coating before ultrasonic agitation is applied. Grinding ratios of diamond tool with ultrasonic during buildup processes were better than without ultrasonic. The diamond tool fabricated with ultrasonic agitation presents better cutting ability. During tool fabricating processes, the reasonable application of ultrasonic agitation is very important.
Experiment Research on Dynamic Cutting Force and its Power Spectrum
Authors: Liu Hong Jiao , Min Min
Published: November 2010

To improve turning process, a testing system for dynamic cutting force was established. The paper studied the dynamic cutting force theoretically and experimentally with the frequency domain analysis. Cutting experiments were conducted for new tools, worn tools, and broken tools respectively. And a comparison among three forces’ power spectrum was made. The results show that the power spectrum value of radial force in the frequency range of 2450~3100 Hz has a close relation to the state of tool wear and tool breakage, which can be used to monitor the cutting process in real time.
Experimental Study on Optimizing Process Parameters in Two-Dimensional Ultrasonic Rolled Extrusion
Authors: Zheng Jian Xin , Jiang Jian Jun , Liu Chuan Shao
Published: November 2010

Two-dimensional ultrasonic vibration was introduced into common rolled extrusion, effect of the process parameters including tool head radius, feed speed, preload and spindle speed on the 45 steel shaft surface roughness were analyzed through orthogonal experiments. Experimental results show that lower value of surface roughness may be obtained in the process of two-dimensional ultrasonic rolled extrusion than that of common rolled extrusion, and the influence order of process parameters on surface roughness is feed speed, spindle speed, preload and tool head radius; the influence curves of tool head radius and spindle speed on surface roughness are concave curves, and influence curves of feed speed and preload on surface roughness are convex curves, or optimizing process parameters exist. The empirical formula for surface roughness is given using multiple regression analysis based on the experimental results. This study will provide a new technique for finishing precision parts.
Experimental Study on Performance Characteristics of Magnetorheological Damper
Authors: Hou Zhen Ning , Feng Zhi Min , Hu Hai Gang , Wu Guang Bin
Published: November 2010

MR dampers are new kind of the most promising devices for structural vibration control. In this paper, an overview of the structure and working principle of shear-valve mode magnetorheological (MR) damper is given. An experimental study was carried out to test the performance characteristics of a shear-valve mode MR damper, its dynamic testing was performed on a Material Testing System (MTS) under sinusoidal and triangle excitation. Based on experimental data, the dynamic characteristics, energy dissipation and dynamic response time were analyzed. The present work lays down a foundation for MR damper application in the semi-active vibration control system.
Experimental Study on the Fabrication of the Light Guide Plate with Hot Embossing Method
Authors: He Yong , Zhang Ting , Fu Jian Zhong , Chen Zi Chen
Published: November 2010

To improve the quality of the light guide plate (LGP) made by injection molding, a fabrication method based on hot embossing was proposed. The silicon mold of the LGP with micro pyramid array was fabricated by wet chemical etching. The experiments of embossing the LGP were performed with a self-designed hot embossing machine. Orthogonal method was used to analyze the imprint pressure, the holding time, the imprint temperature and the width of pyramid with respect to the accuracy of replication (AOR). The experimental results show that the imprint temperature has the greatest effect on the AOR, followed by the imprint pressure and the holding time, while the width of micro pyramid has the minimal effect on the AOR. The increase of imprint temperature can obviously improve the pattern filling quality in the lower imprint pressure (0.7MPa). At last the optimal process parameters were obtained with the imprint pressure of 0.9MPa, the holding time of 5min and the imprint temperature of 130°C.
Experimental System Design of Tension Measure and Control Based on MRF Damper
Authors: Huang Bin , Zheng Di , Hu Li Yong , Lu Feng
Published: November 2010

In order to meet the requirements of research on tension control system based on magnetorheological fluid (MRF) damper, an experimental system of tension measurement and control was developed using an industrial personal computer as hardware control center and using VC software as development tool. By applying the sensing and measuring, computer signal processing, motor speed control, and smart material technologies, the system can achieve the tasks of automatic tension measure and the automatic control of the whole running process. The system has the functions of speed measurement and control, tension measurement and control, as well as power supply control. The experimental data can be displayed and stored in real time. The system has friendly man-machine interfaces. The system can be maintained and expanded easily. Experimental test shows that the system can be effectively used for the research of the tension control based on the MRF damper.
Exploration of a New Leaned Blade Flat Hydrodynamic Torque Converter
Authors: Zhu Xi Lin , Liu Chun Bao , Ma Wen Xing , Wu Xiao Qiang
Published: November 2010

Regarding front-wheel drive passenger car, because of the limit of power transmission system space, a torque converter was developed to the flat shape. In this paper, a leaned blade flat torque converter was developed with an increasingly narrower torus's profile for the purpose of achieving a smaller axial size. It is composed of a pump having a leaned pump blade, a turbine having a leaned turbine blade and a stator, and the flatness ratio is 0.21. The core of the pump blade's inlet and outlet is opposite separately in the shell and moves 1/3 cascade spacing along the pump's hand of rotation. The core of the turbine blade's inlet and outlet is opposite separately in the shell along the turbine revolving and go astern 1/3 cascade spacing. The computational results indicate that the torque ratio decreases slightly but the torus is more flat when the blade is leaned. And the capacity factor decreases, the nominal torque improves, it may use the small effective diameter to satisfy the match request of passenger car with the same engine power, and it has more vital practical significance to solve the question of front-wheel drive layout's limit.
Focus on Connotation Construction Building Engineering Training Practice Base under Local Characteristics
Authors: Miao Xian Wen , Yuan Gen Fu
Published: November 2010

With the gradual expansion of the scale of higher education in our country, contradictions between quality and scale of higher education become more and more obvious. How to build a modern Engineering Training Center in application-oriented engineering colleges in order to meet the social demand for high quality talents? The authors think that we should turn to connotation construction after the construction infrastructure and hardware equipments begin to take shape. This paper makes a deep exploration and practice in the aspects of construction conception, teaching orientation, teaching system construction, students’ engineering quality and innovation ability training, and school-running characteristics etc.
A Squeeze Casting Die Temperature Control System Based on Fuzzy Control
Authors: Ying Fu Qiang , Guo Tao Mei
Published: November 2010

On account of difficulties of squeeze casting die temperature control, squeeze casting process and factors influencing squeeze casting die were analyzed. On the basis of current heating and cooling ways of squeeze casting die, multiple factors and variability of die temperature influence were studied, a new squeeze casting die temperature control model was established. Fuzzy Control was chosen as the control system pattern. After designing the fuzzy controller, simulation model of die temperature control system was set up in the Simulink block of Matlab, and moreover, simulation was performed in it. The simulation results show that the system has good control performance compared with the traditional PID control mode.
Fuzzy Reliability Optimization Design Method of Flange Based on the Tightness of Bolted Flanged Connections
Authors: Sun Zhen Guo , Gu Bo Qin , Huang Xing Lu
Published: November 2010

Based on the time-correlated leakage model and fuzzy random probability theory, a formula for calculating fuzzy random reliability of sealing performance of bolted flanged connections was derived. The optimization variables were defined according to the sensitivity analysis of design parameters on fuzzy reliability of sealing performance. A fuzzy reliability optimization design method of flange was investigated, in which both the tightness of bolted flanged connections and the strength of flange were taken into consideration. As an example, an integral welding necked pipe flange was designed according to the optimization design method proposed in this paper. The designed flange not only satisfies the requirements of flange strength and sealing reliability of connections, but also its weight is reduced by 16% compared with that prescribed in the standard.
Geometric Error Detection and Identification of a Heavy NC Boring and Milling Machine Tool by Using Laser Tracker
Authors: Zhu Xian Qiu , Gao Dong , Cui Gang Wei
Published: November 2010

It is inefficient and complicate to detect geometric errors of a heavy machine tool with large scale dimensions by using traditional laser interferometer. With the development of the laser tracker convenient for measuring large scale dimension, the accuracy of the laser tracker can meet the accuracy requirements for geometric error measurement of heavy machine tools. In this paper a method of using laser tracker for detecting and identifying the error of a heavy NC boring and milling machine tool is introduced. The measuring experiment demonstrates that this new method can improve the measurement efficiency.
Image Measurement of Roller Chain Board Based on CCD
Authors: Liu Qing Min , Liu Zhi Kui , Lei Qiong Hong , Zhang Kui
Published: November 2010

This paper proposes a new kind of detection method based on CCD to measure geometry sizes and roundness error of chain board of roller chain. Image is collected, and is input into computer, then is processed by a series of steps such as grey level transformation, image smoothness, lower filtration, and threshold value selection, etc. The measurement of the geometric parameters and the roundness error relies on the image contour. Roundness error is evaluated by Minimum Region Law. The diameter of the holes and the distance between the axes of two holes are calculated and measured by self-developed program. Roundness error of chain board is less than 8μm, and the distance error between the axes of two holes is 9μm. The diameters of the holes are 4.467mm and 4.461mm respectively. The reasons of measurement error are also analyzed. Theory analyses and experiment show that it is feasible to measure the geometric sizes and roundness error of roller chain by this method, which is both efficient and practicable.
Influence Factor Analysis for Tension Control Based on MRF Damper
Authors: Hu Li Yong , Zheng Di , Zhan Jian Ming , Deng Yi Min
Published: November 2010

Tension control is widely used in industrial production. This paper gives one tension control method using MRF damper as the actuator. The principle of the tension generation is introduced. Through analysis and numerical simulation, the main influence factor of tension changing is obtained. The result of simulation shows that the influence factor of the tension includes the excitation electric current of the MRF damper, the radius of a wheel, rotate speed, the fluctuation of the rotate, etc. These factors present strongly nonlinearity. Through controlling the excitation electric current of MRF damper, the fluctuation of tension can be controlled to decrease.
Injection Molding Process Parameter Optimization for Warpage Minimization Based on Uniform Design of Experiment
Authors: Sun Bao Shou , Chen Zhe , Gu Bo Qin , Huang Xiao Diao
Published: November 2010

To optimize injection molding warpage, this paper applies the uniform design of experiment method to search for the optimal injection molding processing parameters. The warpage. simulation analysis is accomplished by emplying Moldflow software. The melt temperature, mold temperature, injection time and packing pressure are regarded as processing parameters, and processing parameters are optimized through establishing a regression equation, and the optimization result and influence factors are analyzed. The results show that uniform design of experiment can reduce number of experiments used effectively and the quality of the product is greatly improved by the optimization method.
Intelligent Prediction for Surface Roughness of CNC Surface Grinding Machine Tool Based on Bayesian Network
Authors: Jiao Hui Feng , Fu Jian Zhong , He Yong , Deng Xiao Lei
Published: November 2010

Surface roughness is the most important index of product surface in grinding. Bayesian network model was built about process parameters and surface roughness. The network parameters were learned by grinding workpieces with a CNC surface grinding machine tool. The experiments for giving grinding parameters on Bayesian network prediction model have shown good results.
Inter-Enterprise Quality Information Dynamic Tracking Based on Process Quality BOM
Authors: Zhao Li Ping , Yao Yi Yong , Xu Da Min
Published: November 2010

In the modern manufacturing mode, product is often manufactured by multi-enterprise, so effective and dynamic tracking for process quality information is the precondition to realize product quality control in distributed enterprises. Aiming at these demands, a dynamic tracking method for inter-enterprise quality information based on process quality BOM (PQ-BOM) was put forward in this paper. PQ-BOM was employed as the carrier and organization form of process quality information. With the formal definition of PQ-BOM, structure information and process information included in PQ-BOM were mapped to three-layer process model. The process BOM is dynamically updated with the process change, thus the in-time and history quality information tracking is achieved by dynamically reconfigured PQ-BOM. Finally, the application of proposed method has been described in detail.
Manufacturing Process for Circular-Arc Curvilinear Cylindrical Gears with Predesigned Fourth Order Transmission Error
Authors: Su Jin Zhan , Fang Zong De
Published: November 2010

A fourth order transmission error was employed to improve the stability and tooth strength of circular-arc curvilinear cylindrical gears. The coefficient of fourth order polynomial curve was determined, the imaginary rack cutter which formed by the rotation of a head cutter and the imaginary pinion were introduced to determine the pinion and gear tooth surfaces, respectively. The numerical simulation of meshing shows: 1) the fourth order transmission error can be achieved by the proposed method; 2) the stability transmission can be performed by increasing the angle of the transfer point of the cycle of meshing; 3) the tooth fillet strength can be enhanced.
Mechanism of Zn Vapour Suppressed by Al In Laser Lap Welding of High Strength Zinc Coated Sheet Steel
Authors: Zhou Shi Quan , Peng Zhen Guo
Published: November 2010

The basic feasibility of laser fusion welding for prefabrication and assembly of zinc-coated sheet steel auto body components has been demonstrated in a significant number of prior studies. For trouble-free high volume manufacturing, however, one leading key technical concern remains incompletely resolved. In lap or similar weld joint geometries, venting of trapped Zn vapour can seriously disturb the molten weld pool and give rise to gross fusion defects. In this paper, the technical status of the issue has been reviewed, and various experiments were planned to explore Al foil as an interlayer and dual beam laser for suppressing Zn vapour. The results have shown that the welding processing is very sTable when the lap 1+1 mm sheet steel is welded by using Nd-Yag laser at 3KW power and 4m/min travel speed (defined as single beam) with 75μm Al foil as interlayer. However, if first using 2KW power and 4m/min travel speed, secondly using 3KW power and4m/min travel speed (defined as dual beam), only 25 μm Al foil can stabilize welding fusion pool. It is found that Al foil just store the Zn vapour in the single beam method and cannot mix with Zn to form Al-Zn binary alloy, because the laser heating is too fast that Zn has been vaporized before Al was melted. But Al can mix with Zn to form Al-Zn binary alloy in the dual beam method, therefore, the boiling temperature is raised to about 1600°C. So that, in laser lap welding of Zn coated (galvanized) sheet steel, the Al-Zn alloy will be more effective than Al metal for stabilizing welding process.
Modeling and Simulation of Rotated Dual-Plates Ball-Lapping
Authors: Yuan Ju Long , Hu Yong Liang , Lv Bing Hai , Deng Qian Fa , Ma Xin
Published: November 2010

Different spherical shape models of precision ball-lapping are presented and discussed in this paper. A selective analysis of spherical surface morphology model of rotated dual-plates (RDP) ball-lapping is presented. With combined shape errors of three contact points, the spherical surface morphology is more close to the real surface of precision ball. Simulations show that the spherical surface morphology model of RDP method can well express the shape errors of precision balls. The wear rate is easily obtainable as an empirical function of the contact forces, velocities and material properties of the surfaces in contact. The expansion of the net material removal rate gives the rate of the spherical harmonics. The modeling method can capture the change of single point in the process of lapping. Then the parameters, such as lapping speed, preload, and entry point orientation can be studied using this model in the subsequent research.
A Web-Based Collaborative Evaluation Platform for Mechanical Conceptual Design
Authors: Wang Mei Yan , Shen Lian Guan , Deng Yi Min
Published: November 2010

In conceptual design, a number of design concepts and alternatives would be generated. These concepts and alternatives usually need to be evaluated to reduce the search space. However, it is not easy for the designers to determine which alternative is better, especially in the design environment where multiple designers might be involved. Current researches mainly focused on the evaluation models, but rarely provide the integrated tools to assist the evaluation process. To address this problem, we propose a web-based collaborative design evaluation platform and two evaluation principles for different evaluation situations. A design case is used to illustrate the evaluation process, where it is necessary for the designers to select a working phenomenon for the “generate force” subfunction of a nailing machine.
Multi-Attribute Decision Making Method Based-On Information Axiom with Incomplete Information for Functional Requirements
Authors: Cheng Xian Fu
Published: November 2010

For multi-attribute decision making problems including quantitative and fuzzy criteria, a new method with incomplete information for functional requirements based-on information axiom was proposed. When several alternatives satisfy the FRs, the satisfactory degree of users are taken into account in the process of multi-attribute decision making. When the design range of the criterion is unknown, the acceptable range is defined and considered as the design range. The definition and formulation of information content with incomplete information for multi-attribute decision making was developed. All alternatives can be ranked by the total information content, and a final decision was made for the best alternative. Finally, an example on punching machines’ evaluation and selection was used to illustrate the proposed method.
NC-Electrochemical Contour Evolution Machining for Globoidal Indexing Cam
Authors: Tang Xue Fei , He Wei
Published: November 2010

The NC-electrochemical contour evolution machining for globoidal indexing cam was proposed. The principle of electrochemical machining with inter injection cylindrical tool electrode and the composition of the machining system was introduced. The algorithm to determine negative electrode enveloping moving path may generate the NC procedure code used for numerical control machining directly.