bluuebunny/crossref_metadata_2025 huggingface dataset:
Design Optimization for Cold Forging by an Integrated Methodology of CAD/FEM/ANN
Authors: Li Su Yang , Cheng Si Yuan
Published: March 2010

In this paper, an integrated methodology of geometric modeling, finite element method (FEM) and artificial neural network (ANN) is proposed for design optimization of cold forging process. Forging processes with some key design variables are firstly simulated using rigid-plastic FEM so as to create training data for the ANN model. Then neural network model is used to predict for unseen data after being properly trained. Finally, some forging experiments are carried out to confirm the ANN prediction results, a good agreement is found between the predicted data and the measured results.
Knowledge-Based Computer Aided Process Innovation Method
Authors: Geng Jun Hao , Tian Xi Tian
Published: March 2010

The process innovation is difficult, costly and time-consuming because it mainly depends on limited knowledge and random inspiration of individual. This paper presents a knowledge-based computer aided process innovation (KCAPI) method in order to change this situation. In this method, process knowledge is described with formal format, organized into knowledge chain. The process contradiction matrix (PCM) is used to express the relations between technical conflict items in process problem and corresponding solving theories. At last the technical conflicts can be eliminated iteratively based on PCM via knowledge chain to approach the innovation goal. The KCAPI method can implement the systematic and structured process innovation and improve the innovation efficiency and quality. A welding process innovation instance was shown to confirm this method.
Finite Element Static and Dynamic Analysis for a Piston
Authors: Wang Yan Xia , Liu Yong Qi , Shi H.Y.
Published: March 2010

Piston is one of the most stressed components of an engine. In this paper, a 1/2 3-D solid model of a new designed piston was built by using ANSYS software. The stable stress distribution and the deformation under the thermo-mechanical coupling condition were firstly calculated. Calculating results indicates that the maximum stress concentration is at the upper end of piston pin boss inner hole, and is mainly caused by the peak pressure of the fuel gas. Then the finite element dynamic analysis was conducted based on the mechanical fatigue testing method, and the mechanical fatigue life-span was calculated. All these work indicate that the design of the piton is reasonable.
Study on Bending and Upsetting Forging 305 Marine Crankshaft
Authors: Jin Miao , Zhao Shi Yan , Guo Bao Feng , Li Qun
Published: March 2010

Roll-over of crank arm is the major defect of forming quality during the upsetting process. Bending and upsetting forging of crankshaft was simulated by using the rigid-plastic finite element model. The theories of metal flowing and distribution of deformation during the bending and upsetting forging were analyzed, the root cause of the roll-over of crank was found; the optimal combination of the bending and upsetting velocities was obtained; the experimental results agree well with simulations.
Virtual Prototype Simulation of Vertical Clamp Kinematics and Dynamics for Operating Safety
Authors: Liu Jian Xiong , Li Sheng Jun , Peng Jun Tao , Liu Jian Mei
Published: March 2010

Vertical clamps are representative large-capacity metallurgical lifting tool and wide spread employed to lift and to convey vertical cold or hot rolling steel coil of strip. To ensure absolute safety, the kinematics model of the vertical clamp was built, and its virtual prototype was established on Solid Edge, and the working process was simulated based on ADAMS environment. To explain the establishing mode of clamping force, the dynamic positive feedback working process of clamping was discussed. The correctness of simulation was validated by means of analytical investigation. The safe working conditions of vertical clamp were obtained.
Modal Analysis of Flexible Assembling Fixture for Aircraft Panel Component
Authors: Qu Li Gang , Pan Ke Qiang , Chen Xin
Published: March 2010

The dynamic characteristic of flexible assembling fixture (FAF) for aircraft panel component is analysed by the method of finite element modal analysis. Consequently, the every order of natural frequencies and mode shapes of given different postures of the FAF are obtained. It structural weakness were pointed out through the analysis results of the modal vibration characteristics. The properties of mass and stiffness of the FAF's components are concurrently calculated, whose optimal matching and harmonizing with each other have great influence on the dynamic vibration characteristics of the FAF. As the results of these analysis, the design improving suggestion for the FAF is put forward.
Research and Realization of Digital Design System Wheel Loader Main Reducer
Authors: Zheng Quan , Chen Li Qing , Wang Ji Xian
Published: March 2010

By combing the technologies of ASP.NET with secondary development of UG CAD system, a digital design system in main reducer based on B/S and C/S hybrid mode has been built. The system has the functions as optimal design of structure parameter, parts of three-dimensional parametric design and virtual assembly. The frame structure and function modules of the system are discussed in detail. The main reducer digital design system has carried on the confirmation through the concrete example. Compared with the traditional design method, this method upgrades the designing ability and efficiency of the enterprise.
Effects of Interference Fit and Preload on the Performance of Low-Speed Angular Contact Ball Bearing
Authors: Ni Wei Hua , Yao Zheng Qiang , Xi Jun Tong
Published: March 2010

Based on static analysis, this paper investigates the effects of interference fit and axial preload on the performance of the low-speed angular contact ball bearing. The results show the bearing with heavy preload and large radial clearance has big contact angle and high axial stiffness. Besides, large interference could result in small contact angle but high axial stiffness. When the bearing has large interference the axial stiffness increases rapidly due to the effect of interference on the axial stiffness stronger than that of contact angle. And the stiffness formula in the paper could provide boundary conditions for the finite element analysis of spindle-bearing system.
Improvement of Hole Flanging Product Forming Process Using Finite Element Simulation
Authors: Chen Xue Wen , Zhao Jun Wei , Jung Dong Won
Published: March 2010

Flanging is a method of sheet metal forming process under combined compressive and tensile conditions using a punch and die to raise closed rims (flanges or collars) on pierced holes. For the flanging product used for the automotive steering part, the thickness of the bottom radius area is very important because of the crack usually occurred during the using process. But during conventional flanging process, the thickness of the rim and the bottom radius area were decreased seriously and make the hole flanging not strong enough to be used. In order to increase the thickness of bottom radius area of the flanging wall, a new method that combines flanging process and cold forging process was proposed in this paper and a special forming die set was designed with a stripper subjected to counter-pressure with an aim to obtain a more substantial flange. FEM software DEFORM 3D was employed to simulate these flanging part forming processes. The results showed the thickness of bottom radius area of the flanging wall was increased and a more substantial flange was obtained.
Application of Kinematics Simulation Technology in Agricultural Machinery Design
Authors: Cong Hong Bin , Li Ru Xin , Han Xin Yue
Published: March 2010

In this paper, the research status and the significance of the simulation technology were discussed, and the necessity introducing the simulation technology into the agricultural machinery design was analyzed. Through the material kinematics simulation in processing, both the component kinematics simulation and the system dynamic simulation of the agricultural machinery, a specific application of the simulation technology in the agriculture machinery design was displayed. Application of the simulation technology in the agricultural machinery design has a vital significance for enhancing their design and development ability, improving their product performance, as well as promoting new agricultural machinery and the agricultural mechanization.
Complicated Model Establishment and Second Development for Enterprises by MoldWizard
Authors: Kuang Wei Hua , Chen Biao Biao , Lin Yu Cheng
Published: March 2010

Injection molding is among the most widely used techniques for thermoplastics, and many complicated models are used in the mold enterprises. In the paper, the mold design flow by UG MoldWizard was analyzed. A mold for hair drier cover was successfully developed. How to search parting lines, create/edit parting surfaces, extract regions and create cavity and core were researched deeply. Best gate location analysis was studied by MoldFlow software, and a multi-cavity mold was designed. Angled-lift splits were developed to form the concave grooves. Lastly, the gating system and the cooling system were designed. It proved that MoldWizard can obviously improve the drafting efficiency and quality.
Performance Prediction and Design Method for Centrifugal Pump Based on Computational Fluid Dynamics
Authors: Shao Chun Lei , Gu Bo Qin , Huang X.L.
Published: March 2010

Using Reynolds average N-S equations closed by standard k- turbulence model, the steady and unsteady turbulent flow in centrifugal pump was simulated by using MRF model and SM model respectively. A method for predicting the performances of centrifugal pump was built on the basis of computational fluid dynamics. By the presented performance prediction method, not only the flow characteristics of centrifugal pump can be obtained, but also can its performances be evaluated quantitatively and qualitatively. The advantages and disadvantages of some traditional design methods for centrifugal pump were analyzed. On the basis of performance prediction and flow analysis, a new design method was put forward in consideration of the steady and unsteady performances of centrifugal pump. The proposed method can be used to design the centrifugal pump with high running stability, efficiency and cavitation resistance, and it is available for shortening development period and improving design quality of pump.
Dynamic Load Sharing Characteristic of Planetary Gear System with Load Balancing Mechanism
Authors: Zhou Jian Xing , Liu Geng , Ma Shang Jun
Published: March 2010

The dynamic load sharing characteristic of the 2K-H-type planetary gear system with floating center gear is researched in consideration of the manufacturing errors, assembly errors, time-varying mesh stiffness. The nonlinear dynamic model is set up and solved by using Newmark’s method. Then the time history of load sharing factor of the system with load balancing mechanism are obtained, and the effects of the floating clearance， the load torque, and the way of planetary gears assembled on load sharing factor are researched. The sensitivity analysis of load sharing factor is done by using finite differential method. The study provides useful theoretical guideline to the design of planetary gear system.
Optimum Design of Roll Ring
Authors: Sun Li , Huang Shao Qing
Published: March 2010

Roll ring is a key component of test table that can transmit electric signal and arousal power. In order to meet the needs of better transmission and at the same time cutting cost and dimension. Optimum design theory is applied to design and manufacture channeling typed roll ring. Experiment is carried out to contact resistance and fluctuating resistance. The result shows that the optimum roll ring indeed has better static and dynamic properties than slide ring.
Multi-Attribute Evaluation and Optimal Selection Using Information Axiom
Authors: Cheng Xian Fu , Liu Ping An , Chen Cheng
Published: March 2010

For multi-attribute decision making problems, a new evaluation method for alternative selection using information axiom is proposed, of which the functional requirements are incomplete or unknown. Through identifying the type of each evaluation index and determining the probability of success satisfying the functional requirement of each index, the total information content for each alternative is obtained, and ranked in order, so the optimal alternative can be selected. For requirement of evaluation, the calculation formula of information content is amended. Further, this approach allows the decision-maker to amend design range according to the customer’s needs, so the satisfactory alternative with designer’s preference can be obtained and the evaluation process is placed into a more flexible and natural framework. Finally, an example is used to illustrate the proposed method.
Topology Design Optimization of Rib Layout in Box Structure
Authors: Ding Xiao Hong , Li Guo Jie
Published: March 2010

Topology design optimization method of rib layout in box structure is studied by utilizing the structural topology design optimization approach. The box structure is simplified to a hollow box with some parallel bars, two ends of which are connected with the outer loaded panel and the supported panel. The outer loaded panel is set to be the optimal design area, and the density method is applied to solve the topology optimization problem. The optimal material layout of the outer loaded panel decides the existence of the inside bars, and the existed bars form the rib plates. The validity of the suggested method is verified by some typical design problems. The results show that the obtained box structures have much better mechanical and economical performances by comparing with traditional structures, and because the 3-dimentional design problem is changed to a 2-dimentional problem reasonably, the suggested method is effective and has low computational cost.
Development of the Dressing Software for Form Grinding Wheel Used for Grinding Involute Helical Gears
Authors: Su Jian Xin , Deng Xiao Zhong , Ren Xiao Zhong , Xu Kai
Published: March 2010

On the basis of establishing the mathematical model of grinding wheel profile by means of analytic method, the grinding wheel profile was determined. Different factors affecting gear form grinding was analyzed by means of numerical simulation. The form grinding wheel dressing software for grinding helical gear was developed, and the instruction for dressing grinding wheel profile was generated. Wheel dressing results show that the dressing software is correct and feasible.
STEP-Compliant Knowledgebase in Support of Customized Product Development for SMEs
Authors: Ai Qing Song , Xie S.Q. , Zhou Zu De , Liu Quan , Tao L. , Yang W.Z.
Published: March 2010

Nowadays, Small and medium-sized Manufacturing Enterprises (SMEs) are facing intensive competition from the global market. For these SMEs, how to better manage and record the previous Product Development (PD) knowledge has become a core issue for them to improve PD process, cut down development cost and reduce lead time. In this paper, we present our work in developing a STEP (Standard for the Exchange Product Model Data)-compliant knowledgebase for the development of customized products. The paper focuses on how to develop a STEP-compliant knowledgebase that is applicable to different types of customized products. This knowledgebase uses the STEP as a foundation. Tools are developed to model, record and search information such as customer requirements and expectations, engineering responses, product design, decision making and product machining processes, etc. The recorded product information and knowledge in the knowledgebase will then be reused for the development of customized products of similar types.
The HSM Cutters Management System Based on B/S
Authors: Liu Li Juan , Wu Wen Ge
Published: March 2010

As one of the advanced manufacturing technologies, high speed machining (HSM) is expected to be the inevitable trend of manufacturing industries. In our country, the relevant research on HSM starts later, the actual machining and experiment on the machining technology and the machining parameters of HSM are few, the reasonable machining parameters selection scheme and the appropriate cutter choice method are lack. In response, we established the HSM cutters management system based on B/S. The system can facilitate optimized HSM cutters management and improve cutting efficiency by analyzing the processing examples, collecting and analyzing parameters of HSM.
Spinnability of Semi-Continuous Casting 7A09 Aluminum Alloy
Authors: Zhang R.Y. , Yu S.W. , Zhang K.H. , Wang F.C.
Published: March 2010

7A09 aluminum alloy is served as an important structural material in many fields. In this paper, power spinning of semi-continuous casting 7A09 aluminum alloy tube blank was carried out, and the effects of process parameters, such as spinning temperature and roller feeding ratio, on spinnability were analyzed, further the mechanical property was tested on a tensile testing machine. The results show that: at 300°C and 1.2mm/r roller feeding ratio, semi-continuous casting 7A09 aluminum alloy tube blank has good spinnability; after spun, the yield strength is increased 44%, and elongation is increased 130%.
Report Management in Performance Simulation for Complex Mechanical Product
Authors: He Zhao Xia , Liu Geng , Liu Lan , He Li
Published: March 2010

The performance simulation report of product is an important basis for resource distribution and estimate in design process. In order to acquire data rapidly, an automated generated solution of performance simulation report is presented. It can be applied not only in mechanical product but also in other fields. The technology architecture of management system for performance simulation report is constructed, which is based on SOA. And the data management is accomplished by relational database and Java content repository. The BIRT tool engines encapsulate the main step of creating report, then the performance simulation report can be demonstrated by Web browser. At last, an engineer application of multidisciplinary simulation has been implemented and it demonstrated the validity and practicability of the solution.
Arrangement Optimization of Instruments Based on Genetic Algorithm
Authors: Yan Sheng Yuan , Yu Kun , Zhang Zhi Jian , Peng Min Jun
Published: March 2010

The instruments arrangement of human-machine interface can directly influence the operation and efficiency of human-machine interaction in system. A novel instruments arrangement optimization method based on genetic algorithm was proposed. The biology heredity and evolution mode of genetic algorithm was used to search for the optimal or satisfying arrangement solution. Fitness function was constructed based on the principles of importance, frequency of use, relevance and operational sequence. Literal permutation encoding method was applied to represent the instruments arrangement. The optimization preserving strategy was used to enhance the search speed and to enlarge the width and depth of solution space. Finally, a case of instruments arrangement optimization proves that the arrangement optimization method is effective.
Structural Dynamic Topology Optimization and Sensitivity Analysis Based on RKPM
Authors: Zhang Jian Ping , Gong Shu Guang , Jiang Yan Kun
Published: March 2010

A numerical method for structural dynamic topology optimization and sensitivity analysis is presented by using RKPM. In this paper, the relative density of node and maximum fundamental eigenfrequency is respectively chosen as design variable and the objective function, and then the mathematical model for dynamic topology optimization based on RKPM is built. During the process of modeling, some effective measures are taken to dispose the multi-eigenvalues and localized modes. Subsequently, the sensitivity analysis equation is proposed by using Direct Differentiation Method. Finally, by integrating the above sensitivity analysis with Optimality Criteria method, the dynamic topology optimization of an example is performed successfully. Numerical example shows that both checkboards and localized eigenmodes do not occur during topology optimization, and it indicates the proposed method is valid.
Research on Multi-Process Route Decision-Making of Warm Forming for Projectile Bodies
Authors: Yan Shao Jin , Zhang Zhi Min
Published: March 2010

A method of using polychromatic sets theory to define the multi-process routes is proposed to solve the problem of process decision-making during the manufacturing process of warm forming for projectile bodies. First, the description of feature-based information model and modeling method of projectile body parts are studied and then a process mathematical model including a contour comprising matrix and a polychromatic graph is established on polychromatic sets theory, last a search process of warm forming process path is given and an application example is also given in the paper.
Design and Finite Element Analysis of Corrugated Plate Boarding Bridge
Authors: Wei Wen Hui , Zhu Yan
Published: March 2010

With ANSYS finite element analysis software, finite element method is used to analyze the steel corrugated plate boarding bridge. Stress and deformation of the structure are obtained, and strength and stiffness are checked. Improvements are made on this basis to meet the design requirements.
Evaluation and Analysis of the Onlay Patellar Component in Total Knee Arthroplasty
Authors: Liu Chien Wei , Lo Chia Chi , Wang Ching Sung , Yu Chen Tung
Published: March 2010

Complications in total knee arthroplasty (TKA), which may include the inaccuracy of the implantation and the poor component design, can cause major failures in the TKA. Therefore, the present investigation studies the onlay knee implants commonly used clinically to find the major causes of the damage to artificial patella by the computer aided analysis of the three-dimensional finite element model of the artificial patello-femoral joint built through reverse engineering. Results showed that although a significant difference is found in the condition and the state of the stress distribution generated as the patello-femoral joint changes with the flexion of the knees, this variation is still within the tolerable range; but the patellar lateral tilt is something that caught our attention. Furthermore, through the comparison between the study and the clinical results, this investigation concludes that the bone cement on the implant interface is the major cause for the breaking of the pegs, and is not related to the original design of the patella. This study also discovers that slight design modification on the parts of commonly used artificial joints may effectively reduce surgical failure rate; therefore, a more robust design configuration for patellar pegs is proposed.
A Coupled Finite Element and Meshless Local Petrov-Galerkin Method for Large Deformation Problems
Authors: Li Di , Lu Zhi Yong , Kang Wen Qian
Published: March 2010

Based on the interface element method, a coupling algorithm for the large deformation problems has been proposed, which converts the FE analysis into the MLPG computation to preserve the accuracy in the region where meshes have been severely distorted. Numerical example shows that the present method exploits the respective advantages of both the FE method whose computational efficiency is high and the MLPG method which is suitable for large deformation.
Effect of Process Parameters on Microstructures of 30Mn20Al3 Steel
Authors: Qin Xiao Mei , Chen Li Qing , Di Hong Shuang
Published: March 2010

The microstructures of 30Mn20Al3 non-magnetic steel after different finishing temperature and cooling rates have been studied by multi-pass compression test in a thermal-mechanical simulator. The results show that the microstructure of this steel is totally of austenitic with amounts of twins. At the same cooling rate, larger amount of thicker twins appear when lowering finishing temperature. The austenite grain size is related to finishing temperature and cooling rate. The critical temperature of austenite recrystallization is determined as 950~1000°C. When the finishing temperature is about 1000°C and cooling rate higher than 15°C/s, fine and uniform austenite grains can be obtained.
Visual Computation of Thermohydrodynamic Lubrication of Dynamically Loaded Journal Bearings
Authors: Yuan Jian Ping , He Zhi Xia , Wang Qian , Liu Ju Yan
Published: March 2010

The Reynolds equation and energy equation with the thermal balance equation in combination were applied to build the thermohydrodynamic (THD) computational model of the dynamically loaded journal bearings. The most popular development platform——Visual C ++ in the field of computer science and the drawing platform of AutoCAD were combined with the medium of ObjectARX and the object oriented programming technology was used, on the basis of which, the visual computational software of the THD lubrication of the dynamically loaded journal bearings for main shaft and connecting rod bearings of automobile engines was developed. The analysis results of an example indicate that the bearing behaviors are closely tied to the radial clearances and inlet lubricant temperature of the bearing.
Computer-Aided Form Generation for Product Design
Authors: Tsai Hung Cheng , Chen Tien Li , Tsai Hung Jung , Hung Fei Kung
Published: March 2010

The product form design activities involve a high degree of uncertainty and complexity and are therefore not easily formulated, coded and regularized. Consequently, very few of the computer-aided design approaches presented in the literature can support the conceptual form design tasks typically performed at the preliminary stages of a product’s development cycle. To enable designers to perform their design activities more objectively and efficiently, this paper combines the principles of fuzzy set theory, the shape-blending method and genetic algorithms to generate a knowledge-based approach for product form design based upon a database describing the relationships between different product forms and their corresponding perceptual image evaluations.
Numerical Simulation of Flow Field of Metro Train Head
Authors: Yang Bin , Sun Qing Hong
Published: March 2010

According to the structure dynamics and the aerodynamics theories, based on and equations turbulent model, the paper deduced metro train head aerodynamic models. On the basis of three new train heads designed by changing the profile or length of longitudinal projection, the outside flow fields around streamlined B-type metro vehicle were simulated with 3-D incompressible viscous fluid theory based on CFdesign software. This paper analyzed theoretically metro train’s physics characteristics in the tunnel, studied its pneumatic idiosyncrasies in running time, calculated its air resistance coefficient, and looked forward to better head sculpt to reduce aerodynamic resistance and filled the metro train heads with beauty and flavor of the times.
Reconstruction of Human Skeleton Model Using Reverse Engineering Technology
Authors: Huang Yan Hua , Sun Wen Lei , Xu Yan
Published: March 2010

For the reconstruction model of medical image data has necessity and importance to the medical application and research, a variety of methods to reconstruct human skeleton using reverse engineering technology were introduced. One human bone and one femur were reconstructed respectively using the different methods according their different data resource and rconstuction purpose. The output proved the validity and feasibility of the different reconstruction schemes.
Effect of Scanning Velocity on Surface Hardening for Ti Substrate by CO2 Laser
Authors: Liu Yan Hui , Li Jun , Zhang Chao
Published: March 2010

In this document, titanium matrix composite layer was produced by continuous wave CO2 laser system. Microstructure was analyzed by using VHX-600K metallographic microscopy. Results show that the decreasing of laser beam scanning velocity lead to the increasing of the heat energy absorbed by molten pool, the reduction of curvature radius of the laser clad layer, the increasing of width and depth at cross section of laser clad layer, and fine dendrites in the surface of laser clad layer. Microstructure changes both in the laser clad layer and the interface under the common action of melt flow and life time of molten pool.
Optical Properties Characterization of Thermoplastics Used in Laser Transmission Welding: Scattering and Absorbance
Authors: Wang C.Y. , Bates P.J. , Zak G.
Published: March 2010

A better understanding of the optical properties of plastics at IR wavelengths is important for optimizing the laser transmission welding process. In this study, the optical properties, scattering and absorbance, of polypropylene (PP), polycarbonate (PC) and polyamide (PA) were investigated by using spectrophotometer with integrating sphere. The influence of thickness, surface roughness and filler content on optical properties of thermoplastics was evaluated. The results could contribute to a better understanding of the process itself and to success in the practical applications.
Spectrum Changes of Partially Coherent Polychromatic Beams in Laser Resonators
Authors: Li Jia , Xu Shi Xue , Xu Ling Fei , Wang Hai Yan
Published: March 2010

Spectrum of partially coherent polychromatic beams in laser resonators is studied. Analytical formulae for spectrum of Gaussian Schell-model beams in resonators are derived. Numerical results show that spectral shift generated by unstable resonators is much flat and smaller than that by stable resonators. Spectral switch takes place when mirror spot size increases to a certain order of magnitude. Results also show that dependence of generated spectrum on coherence length of sources is very low. These results may be useful for manufacturing high power laser resonators.
Orthotropic Experiment Research on Bending Angel of Laser Shock Forming
Authors: Ding Hua , Zhao Guo Huan
Published: March 2010

LSF is a novel forming technology brought recently. The deformation angle is the main concern of the LSF that was influenced with many factors. In order to optimize process parameters of bending with LSF, an orthotropic experimental method was introduced in this paper. The orthogonal experimental design is adopted to analyze the interaction of different processing parameters with the sample. It can give a relatively accurate description of the effect of laser processing parameters on the bending angle induced in the sample with a representative coverage of all parameters by efficient calculation. And it can make a comprehensive evaluation on coupling of process parameters. In the paper, laser bending of the AL sheet with the thickness of 0.25mm was studied by changing the laser energy, scan speed, and scanning times. The results show that the three parameters have different effects on bending angle, scanning times ranks first, followed by power and scan speed in terms of their effects on the bending angle. Scanning times have strong potential to increase bending angle of laser shock forming. The analysis results show that laser shock conditions should be carefully selected to ensure laser shock pressure for optimized deformation angle.
Pitting Corrosion Behavior in Laser Weld Metals of 2205 DSS with Continuous Heat Treatment
Authors: Liu P. , Jin Xue Jun , Song H.M. , Li Zhu Guo , Ni J.M.
Published: March 2010

Pitting corrosion behavior in laser weld metals of 2205 DSS with continuous heat treatment was investigated by cyclic polarization tests in a 3.5%NaCl solution at room temperature. The results indicated their excellent pitting corrosion resistances in this chloride solution and wide passive regions were observed for all the welds tested. The results demonstrated that laser continuous heat treatment can decrease the problems such as excessive ferrite and intermetallic phases by controlling secondary austenite microstructure. The effects of varying higher heat input on microstructure, mechanical properties and pitting corrosion resistance also were discussed.
Embedment of HA into Superplastic Ti-6Al-4V: Effects of Implantation Temperature
Authors: Yazdan Parast Sanaz , Jauhari Iswadi , Asle-Zaeem M. , Mohamad Dom A.H. , Mohd Khalid H.
Published: March 2010

In this research, we present a method for the embedment of hydroxyapatite (HA) into superplastic Ti6Al4V where the elements of HA and Ti6Al4V diffuse into each other to form a high quality implanted layer. The implantation process into superplastic titanium alloy was divided to two steps; first, the superplastic forming of Ti6Al4V was carried out using high-temperature compression test machine. In the second step, HA was embedded into superplastic Ti6Al4V by using a special designed clamp with an initial compressive load at high temperatures. The EDX and Line Scanning analyses indicate that the resulted film is composed of elements of HA and titanium alloy and due to the diffusion of HA and Ti6Al4V elements into each other, a good embedment is achieved. The elemental diffusion of HA and Ti6Al4V increases by increasing the temperature of the implantation process therefore the thickness of the implanted layer and the hardness of the embedded surface increase with the temperature.
Parametric Analysis Mechanical Properties of Bolted Joints
Authors: Yu Da Zhao , Chen Yue Liang , Jia Zhong Hu , Gao Yong , Liu Wen Lin
Published: March 2010

Three-dimensional finite element model of a bolted joint has been developed in the non-linear finite element code MSC.Marc and attempts were made to validate it by comparing results with those of experiments and other finite element. Issues in modeling the contact between the joint parts, which affect the accuracy and efficiency of the model, were presented. Experimental measurements of surface strains and load transfer ratio(LTR) were compared with results from finite element analysis. The results show that three-dimensional finite element model of bolted joint can produce results in close agreement with experiment. Three-dimensional effects such as bolt titling, seconding and through-thickness variations in stress and strain are well represented by such models. Three-dimensional finite element analysis was also used to study the effects of different parameters on the mechanical behaviour of single lap bolted joints. The results show that straight hole, small bolt diameter, and big hole pitch are selected first for bolted joint if other conditions allowed, and effect of bolt material on LTR of joint is small for small load. Interference and pre-stress should be strictly controlled for bolted joints in order to attain the best fatigue capability of lap joint.
Double Metal Trimming Die Manufactured by Using Hardfacing Method
Authors: Yu Ying Xia , He Bo Lin , Shi Jian Ping
Published: March 2010

It’s simple technology to manufacture big trimming die by hardfacing on the die insert of steel. In this paper, a kind of surface hardfacing technology which deposited by using D322 on 42CrMo steel were studied instead of traditional manufacturing process. The effect of hardfacing parameters on microstructure, hardness and wear resistance are tested and analyzed. The key points of manufacturing trimming die by using hardfacing method was given out. There are no defects in the hardfacing layer. The average hardfacing layer is higher than 57.5HRC. The hardfacing surface has good figurations and hardfacing layer has good wear resistance. The hardfacing for real product of trimming die is completed successfully and their properties reach or exceed those of dies made with traditional technology. This technology is also an effective approach of repairing other cold working dies. The experimental results indicate that the hardfacing technology has much more advantages, cheaper than that of traditional process. The wear resistant test of hardfacing layers were carried out by using different welding current. The best welding current for hadfacing 42CrMo steel is 110 Ampere. The wear mechanism of hardfacing layer is belongs to abrasive wear model.
The Arc Sound Characteristic on MIG Weld Penetration
Authors: Liu Li Jun , Hu Lan
Published: March 2010

Arc sound signal in MIG welding contains plenty of welding information, which is an important signal source of weld penetration. Aiming at on-line monitoring of weld penetration, the relationship between arc sound signal and penetration is analyzed in time-frequency domain through a reasonable selection of sample data. The results show that the spectrum of arc sound signal and penetration status are highly correlative. The changes of penetration can accurately detected by variation of signal energy from 1500 Hz to 4500 Hz in welding process. The above experiments verify the feasibility of monitoring the penetration through arc sound signal and provides theory and application foundation for penetration adaptive control.
Study on Fuzzy Controller of Welding Arc Length
Authors: Ge Wei Qing , Huang Shi Sheng
Published: March 2010

Fuzzy controller of arc-length in welding process was studied. It studied a fuzzy control method of the base time as a control variable and the arc peak voltage as controlled variable. In order to achieve a stable arc welding process, it modulated the pulse frequency by the PFM method. The experimental results showed that the adjust effects of arc-length control was good and the welding was stability.
Research on Laser Full-Penetration Welding In Situ TiB2 Particulate Reinforced ZL101 Composites
Authors: Cui Hai Chao , Lu Feng Gui , Tang Xin Hua , Yao Shun
Published: March 2010

Laser full-penetration welding of novel in situ TiB2 particulate reinforced ZL101 composites was studied using three different welding velocities synchronized with proper laser power. The optimal welding process parameters for laser full-penetration welding of in situ TiB2 reinforced ZL101 composites were suggested. The SEM results show that few pores and uniform particle distribution were obtained. TiB2 particles are intimately contacted with Al matrix according to the results of high-resolution TEM. There was no evidence of chemical reaction at the interface.
Development of High Speed Scanning System for the Fabrication of 3D Metal Parts Using Electron Beam Selective Melting Technology
Authors: Qi Hai Bo , Wang Jian Qiang , Yang Li Ning
Published: March 2010

In this article a method of high speed scanning in Electron Beam Selective Melting (EBSM) technology is presented. Based on the conventional point-to-point vector scanning method, a scanning method nominated profile vector scanning was developed in cooperation with the existing manufacturing system. A scanning speed up to 200m/s was realized using the improved system. 3D parts from 316L metal powder were fabricated using this scanning system and the quality of the fabricated parts was evaluated.
Design and Theoretical Analysis of Mini-Plunger Sprayer Used in SW2502 Fused Deposition Modeling System
Authors: Liu Bin , Peng Man Hua , Feng Yan Hong , Wang Fu Zhen
Published: March 2010

The fused deposition modeling rapid prototyping system is based on the manufacturing principle of layer by layer. The sprayer is the key component which achieves the fused deposition process. Based on the polymer rheological property, the structure design and theoretical analysis of the mini-plunger sprayer of SW2502 fused deposition modeling system are studied. The plasticizing capacity of the mini-plunger sprayer is analyzed in theoretically. It’s very important for the fused deposition modeling process to maintain a stable plasticizing capacity. The driving force of ABS feed is related to several process parameters such as structure form of sprayer and material property, etc. The barrel and nozzle design should be fit for mobility, purity and mechanical property of ABS feed. The modified ABS feed adopts self-pressure-adding driving method to conquer the pressure losses of barrel and nozzle. The plasticizing capacity of the sprayer is more than 20g/h.
Study on Fiber Laser Single Melting Track During Selective Laser Forming
Authors: Liu Jin Hui , Li Rui Di , Zhao Can
Published: March 2010

Melting tracks with and without powder materials were studied by varying the parameters in selective laser melting. Several characters of melting track such as melting width and gilled state stripes were analyzed combining the relationship between the powder materials and processing parameters. Connected with balling effects, thermal transmission and thermal physical properties of powder materials, the formation of above character were explained. The research result of this work would provide a basic foundation for the further investigation of the quality of end metal component manufactured by selective laser melting method.
Research on Patternless Casting CNC Manufacturing Technology and Development of the Equipment
Authors: Shan Zhong De , Liu Feng , Zhan Li , Lin Zhi Lin
Published: March 2010

Based on the review of current status and development of casting CNC manufacturing technology, this paper analyzes the characteristics and studies the mechanism of casting CNC cutting, along with the processing technique. A new casting CNC forming equipment is developed and successfully applied to the product development in automobile industry, mechanical industry and so on, which is regarded as a typical application case. Research indicates that patternless casting CNC manufacturing is a technical renovation compared to the traditional casting manufacturing, with traits of green, digital, flexibility, precision, rapidity. It’s applicable to the rapid manufacturing of metal casting either in single piece or small lot, and the pattern is unneeded. This new technology brings a promising application future in the automobile and mechanical equipment industries.
Fuzzy Optimization Design on Stranded Wire Helical Spring of High-Frequency Vibration Sieve
Authors: Gong Xiao Xin , Rui Yan Nian , He Ying Ping
Published: March 2010

When the common cylindrical helical spring is used in high-frequency vibration sieve for slime dewatering, there are many problems such as poor vibration resistance, easy happening fatigue fracture, etc. In order to solve these problems, this paper uses the stranded wire helical spring as a support instead, and applies fuzzy theory method to get the optimization design. By selecting the design variables correlated with spring and determining the objective function together with the constraint conditions, the fuzzy optimization mathematical model is built and the optimum solution is obtained so as to achieve the perfect results of optimization.
Influences of Polishing Tool’s Shape on Surface Roughness in Magneto-Rheological Finishing
Authors: Yin Shao Hui , Zhu Ke Jun , Fan Yu Feng , Zhu Yong Jian , Chen Yue , Wang Yu
Published: March 2010

Optical glass is widely used as the most important basic material in optical field. In this paper, four different shape finishing tools are designed for polishing flat K9 glass by using magneto-rheological finishing process. Influences of the finishing tool’s shape on surface roughness are investigated and analyzed under different related parameters such as finishing time, rotational speed of tool and finishing gap. The result shows that the slotted tool could obtain better surface roughness than the non-slotted tool under the same conditions. Through changing the magnetic field intensity, finishing gap, rotational speed of tool and finishing time, an orthogonal experiment is conducted to obtain the optimal finishing process parameters.
Chip-Ejection Mechanism and Experimental Study of Water Dispersant Dielectric Fluid on Small-Hole EDM
Authors: Cao Ming Rang , Yang Sheng Qiang , Li Wen Hui , Yang Shi Chun
Published: March 2010

The small hole EDM is one main method of micro holes machining and applied very widely. But it’s machining efficiency is low and machining stability is bad, which is more obvious because of chip-ejection difficulty when the ratio of length to diameter is rather large. Secondary discharge caused by chip-ejection difficulty not only makes the material removal rate reduce, but also causes geometric tolerance and affects product performance. Based on dispersion mechanism study of the water dispersant, the influence of the water dispersant is analyzed to chip-ejection, material removal rate and machining quality of the high-speed small-hole EDM. By contrasting the machining effect on using tap water with disperser dielectric liquid during electric spark small hole machining, adding the certain proportion disperser in water-based dielectric liquid may increase the material removal rate, decrease the tool wear rate, improve the effective impulse numbers, obviously reduce the second discharge number, and the taper of tool electrode and hole becomes small, so the hole machining quality enhances.
Gas-Liquid Combined Multiple Cut in High-Speed WEDM
Authors: Wang Tong , Lu Yu Mei , Lu Xian Chong , Wang Sun Fei , Zhe Jing
Published: March 2010

This paper investigates a new process of wire electrical discharge machining (WEDM) as gas-liquid combined multiple cut. High-speed WEDM (HS-WEDM) finishing was compared in atmosphere and emulsion. Dry finishing has shorter discharge gap, better straightness and surface roughness and much higher material MRR than that in emulsion. Influences of wire winding speed and no load worktable feed on machined surface quality in dry and wet conditions were discussed. The better straightness obtained in gas is explained by analyzing forces acting on wire electrode. When first cut and second cut were performed both in emulsion liquid, and third cut was done in atmosphere, the surface roughness is improved compared with conventional WEDM.
Research on Hydroforming of Bimetallic Lined Pipe
Authors: Chen Qin Zhu , Wang Xue Sheng , Wang Zheng Bian
Published: March 2010

A new kind of hydraulic expansion device for bimetallic CRA-lined pipe has been researched and developed, as well as its operational principal and technical characteristic were introduced. The stress and strain in the liner and outer pipe during the hydroforming process have been analyzed theoretically and the mechanism of hydraulic expansion method is studied, and the final forming pressure formula has been obtained. The theoretical analysis is verified by experimental investigation, the results indicate that the new technology is feasible and can be applied in industrial production.
In Situ Nanoscale Deformation Studies on Micro Copper Wires Using Atomic Force Microscopy
Authors: Zhang Bo Wen , Yan Yong Da , Hu Zhen Jiang , Zhao Xue Sen , Liang Ying Chun , Fei Wei Dong , Dong Shen
Published: March 2010

As the dimensions of parts become smaller, understanding the mechanical properties of these small components was becoming more important. Till present day, the methods and technology used to investigate the deformation behavior in nanoscale were still lacking. In this paper, the specimens were single crystal copper wires with diameter in 50 microns. Atomic force microscope integrated with an in- situ tensile system were used to determine the mechanical behavior of copper wires and observe the surface topography deformation in nanoscale simultaneously. The results were as follows: the modulus of elasticity, tensile strength and failure strain of the sample were 167Gpa, 0.564GPa and 0.011, respectively. By using AFM, the separation process between the copper wire and impurities on it, such as oxide film, was observed. The nanoscale deformation process of the copper wire was also obtained.