bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental Investigation on Effects of Tool Condition on Processing Quality during Broaching 26NiCrMoV145 Supperalloy
Authors: Ge Chun Xin , Li Ming Chao , Tang Hua Jun , Wang Cheng Dong , Liu Zhi Qiang , Chen Ming
Published: October 2013

Reasonable tool condition has crucial importance to prevent tool malfunction such as abnormal wear, chipping and cutting teech breakage when broaching expensive components i.e. gas turbine engines disks. This paper proposes a broaching simulation test method of using customized single tooth groove tools with a variety of rake angle and clearance angle to simulate broaching processing at shaper machine under different cutting depth. The effects of tool condition and cutting depth on cutting forces, surface roughness analyzed by Response Surface Methodology and surface morphology of machined surface were discussed, which revealed that the changes of cutting depth play a dominate role in processing quality, followed by tool rake angle, and tool clearance is subordinate. Good tool edge strength should be assured from prevent shock and vibration during the selection of tool condition.
Kinematics Simulation and Vibration Mode Analysis of Micro Turn-Milling Machine Tool
Authors: Jin Cheng Zhe , Zhu Mao Xia
Published: October 2013

Micro turn-milling has superiority on the productivity and the quality of work pieces, and is more suitable to machine micro-shaft parts and desirable miniature parts based on the turn-milling technology. On the basis of ADAMS and UG software, kinematics simulation of complete machine has been performed, meanwhile, the natural frequency and vibration mode of micro turn-milling machine tool has been analyzed by adoption of modal analysis in this paper. The results forecasts dynamic characteristics of micro turn-milling machine tool. It also provides important reference frame of dynamic optimization design of micro turn-milling machine tool.
Effect of Boronizing on Cutting Performance of Ti(C,N)-Based Cermet Tool
Authors: Yang Hai Dong , Hu Ju Li , Zou Yu Ming , Yang Xiao , Liu Xiao Jun
Published: October 2013

Through the experiment of cutting 45 steel, the influence of boronizing on Ti (C,N)-based ceramic cutting performance in different cutting speeds were discussed. The test results indicated that: regardless of boriding, cutting speed has a great influence on the life of Ti (C,N)-based ceramic cutting tool. Within the limit of 200~400 m/min, the lower the cutting speed is, the longer tools life. At the minimum speed, boronizing greatly improves cutting performance and doubles tool life. It has no significant but negative effects once over 300 m/min. The decrease of the abrasion resistance of boronized layer is mainly influenced by the intense thermal shock of high speed cutting.
The Polishing Process of Cylindrical Rollers by Using a Double-Side Lapping Machine
Authors: Zhou Wen Hua , Yao Wei Feng , Feng Ming , Lv Bing Hai , Deng Qian Fa
Published: October 2013

The surface quality of cylindrical rollers has a great influence on the working life of rolling bearings. In the paper, double-side lapping machine and flannelette pads are applied to polish the cylindrical surface of rollers. After 20 min polishing, rollers with smooth surface are obtained and the roundness of the rollers have a improvement of about 0.3 μm, which means that the polishing process based on double-side lapping method can effectively improve the surface quality and geometric accuracy of cylindrical rollers.
Mechanical Behaviors Analysis and Johnson-Cook Model Establishment of 4Cr13 Stainless Steel
Authors: Zhang Li Na , Li Peng Nan , Tang Si Wen , Tang Wen Bo , Zhang Shuai
Published: October 2013

The stress-strain curves, mechanical behaviors, and Johnson-Cook model of 4Cr13 stainless steel were investigated at both the strain rates from 0.001s-1 to 7000s-1 and the temperatures from 293K to 673K based on the electronic universal testing machine and the split Hopkinson bar. The results showed that 4Cr13 stainless steel was very sensitive to the temperature and the strain rate. The temperature sensitivity factor decreased with increasing the temperature, and the strain rate sensitivity factor increased with increasing the strain rate. Both the temperature sensitivity factor and strain rate sensitivity factor decreased with increasing strain. The flow stress increased with strain rate and strain, but decreased with temperature. The J-C model prediction had a good agreement with the experimental stress-strain in the wide range of temperatures and strain rates. The Johnson-Cook model gave the foundation for finite element analysis during the cutting process.
Study on Fixed Abrasive Lapping Hard and Brittle Materials with Brazed Micro Powder Diamond Disk
Authors: Li Quan Cheng , Shen Jian Yun , Fang Cong Fu , Xu Xi Peng
Published: October 2013

In this study, two different arrangement lapping disks fixed with brazed diamond pellets were used to lap silicon wafer and alumina ceramic. The effects of the surface morphology, roughness, and removal rate of workpiece caused by lapping pressure, lapping time, workpiece velocity, and disc arrangement were operated with serials experiments. The results of the researches provided guidance for fixed abrasive lapping of hard and brittle materials with the brazed micro powder diamond disk.
The Adherence Mechanism of Superalloy Honing Oilstone
Authors: Lin Zhu , Pan Lin , Yan Chen
Published: October 2013

On the foundation of researching adhesion mechanism of superalloy honing stone, theoretical analysis and mathematical modeling of parameters were made that affecting the wear particle adhesion rate of superalloy honing stone, then inspect and verify the relation between the adhesion rate and processing parameters through the experiment. Draw the conclusion that when the honing pressure increases or the speed of work piece decreases, the adhesion rate αa will increase.
Analysis of Path Distribution in Lapping and Polishing with Single Fixed Abrasive
Authors: Lu Long Yuan , Fang Cong Fu , Shen Jian Yun , Lu Jing , Xu Xi Peng
Published: October 2013

The path distribution can directly affect the machined workpiece surface quality in lapping and polishing, such as planeness, roughness, etc. In present paper, the influence of rotate speed ratio (RSR) and abrasive position on path distribution was analyzed with a single fixed abrasive. The results show that the RSR and abrasive position has heavy influence on the path distribution. The path distribution with decimal RSR is more intensive and complicate than that with integer RSR, especially complex decimal RSR, and it can be also affected by the abrasive radial and circumferential position, but the shape of path is not changed with different abrasive circumferential position which only affects the initial phase angle of path.
Simulation of Edge Chipping in Laser-Assisted Milling of Silicon Nitride Ceramics Using the XEFM
Authors: Wu Xue Feng , Gao Teng Fei , Wang Yang
Published: October 2013

Theoretical, experimental and simulation researches are investigated to study the phenomenon of edge chipping in laser assisted milling (LAML) of silicon nitride ceramics. To consider the crack evolution and influencing factors of edge chipping, the Extended Finite Element Method (XFEM) is used to model the process of chipping crack with the advantage of independent of the mesh and needless to remesh with the crack growth. The chipping width measured from experiments are loaded as initial boundary conditions to build the XFEM model, and the results show the edge chipping reduces with cutting forces decreasing and edge toughness increasing. The model reveals the edge chipping of workpiece reduces at elevated temperature through softening and toughening mechanisms.
Surface Microstructure Machining for LED Light Extraction Efficiency Enhancement
Authors: Yuan Dong , Lu Long Sheng
Published: October 2013

The external efficiency of LED is limited by total internal reflection on the interfacial surface. Surface structure modification is an effective way to solve this problem. In this work, micromachining method was present to manufacture surface microstructures for the GaN based LED light extraction efficiency enhancement. The feasibility of micromachining was discussed theoretically and proved by experimental study in this work. Micro-cutting and micro-forming approach was found be suitable for GaN surface microstructure machining. An experimental study of micro-cutting was carried out. The result shows that no crack and failure occurred during micro-cutting with 1μm cutting depth. This result demonstrated that microstructure can be machined on GaN based LED surface to enhance the LED light extraction efficiency.
Working Fluid Inventory Effect on Heat Transfer Performance of a Grooved Micro Heat Pipe
Authors: Li Xi Bing , Ma Yun Shi , Wang Xun , Li Ming
Published: October 2013

As a highly efficient heat transfer component, a micro heat pipe (MHP) has been widely applied to the situations with high heat flux concentration. However, a MHPs heat transfer performance is affected by many factors, among which, working fluid inventory has great influence on the security, reliability and frost resistance of its heat transfer performance. In order to determine the appropriate working fluid inventory for grooved MHPs, this paper first analyzed the working principle, major heat transfer limits and heat flux distribution law of grooved MHPs in electronic chips with high heat flux concentration, then established a mathematic model for the working fluid inventory in grooved MHPs. Finally, with distilled water being the working fluid, a series of experimental investigations were conducted at different temperatures to test the heat transfer performances of grooved MHPs, which were perfused with different inventories and with different adiabatic section lengths. The experimental results show that when the value of α is roughly within 0.40±0.05, a grooved MHP can acquire its best heat transfer performance, and the working fluid inventory can be determined by the proposed mathematic model. Therefore this study solves the complicated problem of determining appropriate working fluid inventory for grooved MHPs.
Effects of MgO and Y2O3 on the Microstructure and Mechanical Properties of Al2O3 Ceramics
Authors: Liu Hua He , Liu Han Lian , Huang Chuan Zhen , Zou Bin , Chai Ya Cong
Published: October 2013

Al2O3-MgO, Al2O3-Y2O3 and Al2O3-MgO-Y2O3 composite ceramics were fabricated respectively by hot-press sintering technique. With the analysis of the mechanical properties and microstructure, it was found that single additive MgO could be more favorable to the grains’ refinement and densification than Y2O3; the composite additive including both MgO and Y2O3 was better than single additive MgO or Y2O3, because their interactions could improve the mechanical properties of the Al2O3 ceramics; The sintering temperature could be reduced by adding the suitable amount of composite additives.
Effect of Ball-Milling Time on the Microstructure and Mechanical Properties of Submicron Ti(C,N)-Based Cermets
Authors: Zhou Hui Jun , Huang Chuan Zhen , Zou Bin , Liu Han Lian , Zhu Hong Tao , Yao Peng , Wang Jun
Published: October 2013

In this study, titanium carbonitride (Ti(C,N)) based cermets were prepared by submicron particles, sintered in a vacuum and hot-pressing furnace. And the effect of different ball-milling time (36 h, 48 h, 60 h and 72 h, respectively, mostly aimed for mixing) on the mechanical properties of Ti(C,N)-based cermets, including transverse rupture strength (TRS), Vickers hardness (HV20), fracture toughness (KIC) and microstructure were investigated. The results showed that the TRS, hardness and fracture toughness were all improved with an increase in ball-milling time (not more than 60 h). Scanning electron microscopy (SEM) investigations on the microstructure of cermets with different ball-milling time revealed that the compound powders were not very well-distributed as a whole and there were coarse hard phase grains, but the microstructure was very homogeneous in parts, and the microstructure of cermets with a ball-milling time of 60 h is relatively more homogeneous. So a refinement to Ti(C,N) raw particles is needed in later studies.
Fabrication and Application of Si-Doped Diamond Coated Welding Dies
Authors: Wang Liang , Lei Xue Lin , Shen Bin , Sun Fang Hong , Zhang Zhi Ming
Published: October 2013

Si-doped diamond films are deposited on cobalt cemented tungsten carbide (WC-Co) welding dies using hot filament chemical vapor deposition (HFCVD) method, where tetraethoxysilane (C8H20O4Si) is introduced in the reactive chamber as silicon source by bubbling method. Filed emission scanning electron microscope (FESEM) and Raman spectroscopy are used to characterize the as-deposited diamond films. The results show that silicon doping can reduce the diamond crystal size and residual stress of diamond films, and also increase the FWHM of first order diamond Raman line. The polishing time of diamond coated welding dies also can be shortened by silicon doping. Si-doped diamond coated welding dies possesses comparable practical application performance with conventional diamond coated welding dies. Compared with the nylon and WC-Co welding dies, the working lifetime of diamond coated welding dies increases 200 and 10 times, respectively.
Machining Feature Classification and Description for Intelligent Tool Selection
Authors: Ma Hong Long , Liu Zhan Qiang , Ye Hong Tao
Published: October 2013

In manufacturing process, reasonable tool selection can greatly improve the efficiency and reduce the cost of machining. In order to obtain optimized tool solutions, object-oriented approach to the classification and description of the machining features are presented in this paper. Machining features by means of object-oriented classes, attributes and methods are described. Efficient processing information for tool selection is extracted. Tool selection model based on the machining features is established. Cutting tool intelligent selection is implemented through rule-based reasoning. This work will help the process planners to select more reasonable cutting tools.
Design of a Double Radius Type Large Volume Cubic Anvil for Achieving Longer Lifetime and Higher Cell Pressure
Authors: Han Qi Gang , Zhang Qiang , Chen Ya Dong , Li Yue Fen , Ma Hong An , Jia Xiao Peng
Published: October 2013

Large volume cubic anvil (LVCA) have been widely used in cubic high pressure apparatus, which can accommodate a large sample volume (the largest volume of compressed cell is 422 cm3), but they are limited by shorter lifetime (£143000 times) and lower cell pressure (£146 GPa). In this paper, we have designed of a double radius type LVCA, which has three advantages. Firstly, the rate of cell pressure transmitting and the pressurized seal stability of the sample cell can be maintained, which is often sacrificed with optimum the geometrical condition of the anvil. Secondly, the lifetime of double radius type LVCA can be increased about 19.86 % than that of traditional anvil. Thirdly, the cell pressure can be increase about 13.45 % after the modification of the anvil. This work makes an ?effective ?solution ?for ?solve the choke points of LVCA and would be used widely in other types of Multi-anvil apparatuses.
Modal Analysis of Vertical Spindle Using on Fly-Cutting Machine Tool with Transfer Matrix Method
Authors: Fu Peng Qiang , Zhang Qiang , Zhang Fei Hu , Zhang Chao
Published: October 2013

This paper provides the transfer matrix method to analysis the natural frequency of the vertical spindle using on ultra-precision fly cutting machine tool. Several transfer matrix equations of the typical units of the spindle had been established when considering the effects of the gyroscopic torque as the rotor has a large inertial tensor. And then the natural frequencies and each modal shape of the spindle rotor system were calculated using the transfer matrix model. Also, the modal experimental test had been taken out. The theoretical results from the transfer matrix model are very close to the test results, and the accuracy and the effective of the model was proved.
The Stiffness Field Modeling and Analyzing of Tool Position and Orientation of Five-Axis NC Machining System
Authors: Wu Shi , Qu Da , Liu Xian Li , Xu Hong , Wang Zheng Chun
Published: October 2013

The transformation of tool position and orientation has impact on processing performance of the system when processing complex surface. Five-axis NC machine center was taken for example in this article. Semi-analytical calculation method was taken for stiffness field of system. Based on virtual-work principle, the composite stiffness field modeling of system was built by methods of Jacobian matrix, point transformation matrix and finite element, etc. For the key point of workpiece surface which is needed analyzed, 3D space force ellipsoid was introduced, composite stiffness field was modeled and composite stiffness performance of system was analyzed by force ellipsoid with different tool position and orientation. Guiding conclusion was obtained for following works by analyzing influence of tool position and orientation on stiffness performance.
Influence of Cutting Speed on Surface Plastic Deformation and White Layer Formation of FGH95
Authors: Du Jin , Liu Zhan Qiang
Published: October 2013

The superalloy parts in the aeronautical field demand high reliability, which is largely related to surface integrity. Surface integrity generally includes three parameters, such as geometric parameter, mechanical parameter and metallurgical parameter. The paper presents the influence of cutting speed on surface plastic deformation and white layer formation through orthogonal milling of FGH95 superally material. The influence of cutting speed on grain refinement of machined surface is also investigated. It is found that cutting speed has significantly effect on the surface metallurgical characteristic microstructure. The increasing of cutting speed creates severer plastic deformation. Surface plastic shear strain increases with the increasing of cutting speed, while the depth of plastic deformation decreases on contrary. White layer thickness is increased with the increasing of cutting speed. Through statistical analysis for grains number, it can be drawn that the higher the cutting speed, the more serious grains refinement.
Design of a Three-Axis Desktop Micro Milling Machine Tool
Authors: Cheng Xiang , Yang Xian Hai , Li Li , Liu Jun Ying
Published: October 2013

Micro milling process is more favorite than other processes for its unique advantages in ultra-precision machining of miniature components with intricate three-dimensional geometrical feature made of various materials. Aiming at micro milling applications, a three-axis desktop milling machine tool with linear motors and nano-meter linear scales has been introduced. Natural granite is used as the frame material and air-bearing cylinders are used for z-axis gravity balancing. Finite element method is applied to the design and optimization of the machine structures. The designed machine adopts linear motors and 5nm resolution linear scale using an open control architecture. The workspace is 100mm×100mm×100mm and the overall size is 610mm×650mm×630mm. Experimental evaluations show the sub-micron machining feasibility of the introduced machine.
Discuss of Structure and Finite Element Analysis of the Ultrasonic Vibration Turn-Milling Machine Tool
Authors: Wang Li Meng , Li Xiao Zhou , Xu Jin Kai , Lin Lin , Wang Jing Dong , Yu Zhan Jiang
Published: October 2013

In this paper, ultrasonic vibration turn-milling machine tool has been designed based on the analysis of processing principle . CATIA is used to generate three-dimensional solid model for the overall layout structure of high speed miniature lathe, while finite element analysis software is used to achieve dynamic performance analysis, so as to obtain each factorial of machine-tool vibration and natural frequency. The results are important to machine optimization and the construction of experimental prototype, and will guide the next work.
The Remote Monitoring Management and Fault Diagnosis System of the Distributed Open Numerical Control System
Authors: Ma Cong Guo , Wang Jian Guo , Li Ya Zhou
Published: October 2013

This paper presents the design scheme of monitoring management and fault diagnosis of open CNC system based on Internet, the system hardware structure introduces network technology three-tier monitoring mode based on field control layer and process monitoring control layer and remote fault diagnosis layer, the system software design includes CNC system management and monitoring and fault diagnosis. The paper integrates condition monitoring and fault diagnosis and expert system technology into CNC system monitoring and management, and analyzes the requirements of distributed numerical control system, and details description system model of remote monitoring and fault diagnosis system. The practice has proved that the system design of open remote monitoring and fault diagnosis is practicality and feasibility.
Study on Application of Lubrication Technology in Turning Pure Iron
Authors: Xu Dong Ming , Chen Hui , Kong Jin Xing
Published: October 2013

In the process of precision turning parts of pure iron, tool wear is very serious. The tool wear has been a key factor to affect the precision of parts. In this paper, the experiments of turning pure iron by use of carbide tools have been carried out in different cooling and lubricating conditions. Based on the analysis of the SEM pictures of carbide tool wear morphology and the compare of the carbide tool wear degree in different cutting conditions, it can be concluded that the carbide tool wear mechanism are mainly adhesion wear and fatigue wear and the benefit of lubricating condition is better than cooling condition to improve the tool life. According to the results, the application of CMQL technology can effectively reduce tool wear in turning pure iron.
Tool Life of Coated Tools in Face Milling of GH4169 at Various Cutting Speeds
Authors: Wang Xiang Yu , Huang Chuan Zhen , Zou Bin , Zhang Qing Ge , Liu Han Lian , Zhu Hong Tao , Wang Jun
Published: October 2013

GH4169 is widely used in aerospace industry, and it is a typical difficult-to-cut material. Tool life in cutting GH4169 is very low. In this paper, tool life tests of face milling GH4169 were carried out at 30~90m/min with coated tools. The effects of cutting speed and feed rate on the tool life were studied. It was found that the tool life was very sensitive to the cutting speed. And tool failure mode was flank wear at low cutting speed, but turned to tipping at high cutting speed. At last, the suitable cutting parameters were recommended.
Tribological Properties of CVD Diamond Films against Zirconia Ceramic
Authors: Wang Hai Wang , Lei Xue Lin , Wang Liang , Shen Bin , Sun Fang Hong
Published: October 2013

Microcrystalline diamond (MCD), nanocrystalline diamond (NCD) and microcrystalline and nanocrystalline composite diamond (MNCD) films are all deposited on flat square shaped WC-6%Co substrates by using bias-enhanced hot filament chemical vapor deposition (HFCVD) apparatus. The diamond films are characterized with scanning electron microscope (SEM) and Raman spectrum. Typical diamond film features are exhibited in the observation of SEM and the analysis results of Raman spectrum. The tribological properties of diamond films against zirconia ceramic are conducted on a ball-on-plate type rotating reciprocating tribometer in ambient air. The average friction coefficients of MCD, NCD and MNCD film in stable period are 0.205, 0.181 and 0.138 respectively. The images of surface topography based on white-light interferometer suggest a very low wear rate of CVD diamond film.
Analysis on Residual Stresses of the Casing Part in Aeroengine Based on Hole-Drilling Method
Authors: Cao Dian Ye , Yang Yin Fei , Liu Zhi Wu , Yu Jie , Li Liang
Published: October 2013

In order to study the residual stress distribution of the casing part in aeroengine, the hole-drilling method was used to measure the residual stress before and after the annealing treatment. The measurement results indicated that the annealing treatment significantly improved the residual stress distribution in the part, and the residual stresses were showed as compressive stress. Meanwhile, the measured residual stress distribution would provide the basis for controlling the machining distortion of the casing part in aeroengine.
Development of Multidimensional Loading Material Testing Machine
Authors: Guo Jiang Zhen , Fan Rui , Wang Dan , Chen Wu Yi , Sun Yong Sheng
Published: October 2013

A multidimensional loading material testing machine (MLMTM) based on Stewart Platform is proposed in this paper. The kinematic and dynamic characteristics of MLMTM are analyzed, including the influence of universal joint in each limb on dynamic modeling. The dynamic model is established via Kane method, and the control system is founded based on classic PID strategy. Four experiments are performed to examine the validity of proposed dynamic model and control system of the MLMTM, including two uniaxial experiments and two biaxial experiments. Results of these experiments are summarized as well as the capacity of force tracking and load errors are analyzed. The experimental results demonstrate the validity of dynamic model via Kane method and illustrate that the proposed MLMTM is capable of performing multidimensional loading tests.
FE Analysis of Stress Concentrations in Composite Plates with Multiple Holes for Zigzag Multi-Fastened Joints
Authors: Gao Chong Yang , Xiao Jian Zhang , Ke Ying Lin
Published: October 2013

Most fatigue failures in aeronautical structures occur at fastened joints due to stress concentration (SC). Since more and more advanced composites are applied in aircrafts instead of conventional alloys, SC in CFRP composite plates with zigzag-arranged multiple holes has been investigated by finite element method in this paper. It is found that the static SC factor (SCF) of CFRP plates varies with the dimensionless bore and zigzag angle by a greater change than isotropic plates, and that the dynamic response amplitude and frequency of the SCF depend on the dimensionless bore and the dimensionless wave number related with material properties and the exciting frequency.
Femtosecond Laser Micromachining of SiC Ceramic Structures
Authors: Gai Xiao Chen , Dong Zhi Wei , Zhao Qing Liang , Liu Hong Bin
Published: October 2013

Femtosecond laser micromachining technology shows abroad application background in the field of micro manufacturing due to its unique advantages, especially for micromachining of ultrahard materials such as Silicon carbide (SiC) ceramic. The femtosecond laser micromachining system was set up, by using the system, effects of scanning velocity and laser pulse energy on quality of micromachined features were evaluated. The optimized technological parameter was obtained as 8mW, 1mm/s with 1kHz repetition frequency respectively on the basis of the morphological characteristics and microstructure accuracy. Besides, V-shaped cavity of 300μm depth and 120°angle was generated with layer-by-layer scan machining. Thus femtosecond laser micromachining technology is an effective method for hard and brittle materials precision processing.
Numerical Simulation on Stress Distribution and Failure of Composites Holes with Cold Expansion
Authors: Cheng Yuan Qing , Su Hong Hua , Fu Yu Can , Ge En De
Published: October 2013

A numerical investigation was conducted to apply cold expansion methods on composites structures under the guidance of cold expansion techniques of metal materials and interference-fit techniques of composites structures. Finite element expansion models with sleeves or without sleeves are established to study the stress distributions and failure conditions around cold expanded holes with different expansion values (0.5%, 1% and 1.5%). Results show that no damage occurs with expansion value 0.5% and using a sleeve in the expansion process can cause uniform stress distributions.
Research on the Influence of Different Surface Machining States on the Inclination of the Porous Gas Bearing
Authors: Jin Zi Cai , Lin Bin , Zhang Xiao Feng , Li Jing Huai , Qiu Shuang
Published: October 2013

The influence of different surface machining states on the porous gas bearing inclination and its cause are studied in this paper. A loading experiment on the porous gas bearings of different surface processing states is conducted. The presence of tilt of the gas bearing during the working has been ascertained. The uneven distribution characteristics of the porous material permeability after surface processing are analyzed through the porous material partition experiment, thus explaining the gas bearings tilt phenomenon. The influence of milling and grinding on the inclination of the porous gas bearing is mainly studied.
Finite Analysis of Cutting Temperature with Internal Lubricating Tool
Authors: Huo Wen Guo , Tian Qing Song , Shao Juan , Qi Hou Jun
Published: October 2013

The objective of this work is to model the cutting temperature generated during dry turning with micro-graphite internal lubricating tool. Dry cutting FEM were carried out with these micro-graphite internal lubricating tool and conventional YG8 tool based ABAQUS. The machining performance was assessed in terms of the cutting temperature. Results show that the cutting temperature with the micro-graphite internal lubricating textured tools was reduced compared to the conventional tool.
Numerical Simulation on the Jet Characteristics of Abrasive Jet
Authors: Wang Rong Juan , Wang Cheng Yong , Zheng Li Juan , Song Yue Xian
Published: October 2013

Abrasive jet technology is widely used with the advantages of environmental protection, with better energy concentration and processing quality, free from any tool passivation, heat affected zone, spark, or any changing in physical or chemical properties of workpiece. Due to the fact that jet characteristics are the main reasons which influence processing quality, numerical analysis is used as the major method of researching currently. The existing research of jet characteristics of abrasive jet by numerical simulation methods is discussed in the paper, including jet fluidizing and mixing process simulation, jet formation process simulation and jet erosion workpiece simulation. Finally the key problems of the simulation on the jet characteristic are given.
FEM Simulation of the Cold Drawing Process for Copper Strip with Diamond-Coated Shaped Die
Authors: Lin Zi Chao , Sun Fang Hong , Zhang Zhi Ming , Shen He Sheng , Guo Song Shou
Published: October 2013

Diamond-coated drawing dies are considered as ideal drawing dies for their unique characteristics, such as high hardness, wear resistance and low friction. To utilize the superior characteristics of diamond coatings, the FEM simulation is used to simulate the copper strip cold drawing process. The stress and the drawing load are predicted. The influence of parameters of drawing process on the drawing load is investigated. The optimal parameters are obtained.
Study on the Efficiency-Reinforcement Design for Elastomeric Hydraulic Reciprocating Sealing Based on QFD/TRIZ
Authors: Zhang Fu Ying , Li T. , Zhang Hong Chao
Published: October 2013

The efficiency-reinforcement design for elastomeric hydraulic reciprocating sealing is relevant to many elements such as the shape and materials of sealing and its structure supports, the lubrication characteristics, and the operating parameters. In this paper, the efficiency-reinforcement design process model for elastomeric reciprocating sealing based on QFD/TRIZ is built, which is used to guide the reciprocating sealing efficiency-reinforcement design rapidly. QFD is used to identify the key elements that affect the sealing efficiency-reinforcement. TRIZ is used to resolve the conflicts of key elements, and give the efficiency-reinforcement design solutions.
Multiple-Section Process Information Description Method for 3D Instruction Publishing
Authors: Zhao Dong Ping , Tian Xi Tian , Geng Jun Hao , Tang Jian Jun
Published: October 2013

To deal with the complete description and quick search for 3D process instruction publishing, a three-section process information description method was presented based on the features of process data. First, a three-section description model for 3D process instruction publishing is established according to the application type and data structure. Subsequently, an abstract matrix representation method is provided to express 3D process information, then the specific contents of the abstract matrix is analyzed and an instantiated matrix is given. Finally, an illustrative example is used to explain an application of the proposed approach.
Grinding Force and Specific Energy in Plunge Grinding of 20CrMnTi with Monolayer Brazed CBN Wheel
Authors: Gu Shen Shen , Yang Chang Yong , Fu Yu Can , Ding Wen Feng , Huang Da Shun
Published: October 2013

In this paper, plunge grinding experiment was conducted on 20CrMnTi with monolayer brazed cubic boron nitride (CBN) wheel. Surface integrity was evaluated through morphology observing and roughness testing. It is found that surface roughness Ra is lower than 0.8μm. Grinding forces were measured and the effects of process parameters (i.e. workpiece speed and depth of cut) on grinding forces were studied. The changing regulation of specific grinding energy with the increase of equivalent chip thickness was revealed. The result shows that both grinding force and specific energy are lower comparing with white fused alumina (WA) wheels. In general, monolayer brazed CBN wheels perform better in grinding of 20CrMnTi than WA wheels.
Geometrical Modeling Method of Process Driven by Typical Process Model
Authors: Xin Yu Peng , Tian Xi Tian , Huang Li Jiang , Geng Jun Hao
Published: October 2013

In order to improve the efficiency of NC machining programming, and realize the rapid establishment of blank model or middle blank model, a geometrical modeling method of process driven by typical process model was put forward. This method is based on the typical process for the establishment of typical process model, to establish a mapping between modeling operation and machining process ontology, and format model mapping rules. In the process geometrical modeling of the high similarity parts, by calling the typical process model mapping rules, can generate process models automatically. A enterprise disc type parts typical process as an example is used to verify the proposed method.
An Improved Mathematical Model of Resin Concrete and the Study of its Thermal Stability
Authors: Qiu Shuang , Wang Yu Guo , Lin Bin , Zhao Kun , Jin Zi Cai
Published: October 2013

An improved model with polygonal aggregates is proposed to analyze the thermal stability of the resin concrete in this paper. A 2D polygonal aggregates model is established to make the calculating results closer to the reality and the 2D model is the slice directly captured from the 3D model based on the predecessors theory. A comparison is made between the conventional model with spherical aggregates and the polygonal aggregates model in this paper. The results of the analysis on the improved model are closer to the previous research results and more accurate than the spherical aggregates model. It confirms that the polygonal aggregates model is accurate enough to analyze the properties of the resin concrete.
Application and Prospect of the Non-Newtonian Fluid in Industrial Field
Authors: Peng Yan , Lv Bing Hai , Yuan Ju Long , Ji Hong Bo , Sun Lei , Dong Chen Chen
Published: October 2013

Non-Newtonian fluid is a kind of fluid that its shear stress is not always keeps a linear relationship with the shear strain rate. An overview of its applications was made here. Based on the special rheological properties, non-Newtonian fluids are divided into different types and used as additives, mediums and protective materials in many fields. The paper focuses on its applications in fluid rheological properties improving, damping devices, individual protection equipments and mechanical processing. The main achievements in application of the non-Newtonian fluid were introduced and a further prospect was also summarized.
The Strength Check for the Cockpit of "Ferris Wheel" Amusement Machine with ANSYS
Authors: Zou Ke Wu , Li Bing Bing , Hu Zhu Bing , Liu Chun Zhe
Published: October 2013

Traditional mechanical calculations are more often used in the strength check of the amusement facility nowadays. However, there exit some disadvantages in this way, such as the long cycle cost, the heavy workload, and particularly the inability in case of more intricately forced parts. This paper illustrates the idea of using finite element analysis (ANSYS) software to check the strength of Ferris Wheel amusement machine rotating cockpit, analyzes the loads and stresses of the cockpit frame under extreme work conditions, and comes to a reasonable conclusion. And the strength check of intricately forced workpiece of amusement machines are explored as well.
The Segmentation of Ferrography Images: A Brief Survey
Authors: Wang Jing Qiu , Wang Xiao Lei
Published: October 2013

This paper provides a general overview on the developments and progress in the segmentation of ferrography images. The problems experienced with applying traditional image processing methods in the segmentation of wear particles, revealed that it is still a big challenge for intelligent ferrography. This has highlighted the need for combining the segmentation and clustering methods for performing ferrography image analysis. In this paper, some of the developments reported in the literature relating to progress made with wear particle image segmentation are reported and examined as a basis for establishing improved methods of ferrography image analysis.
Interfacial Microstructure of Ultra-High Frequency Induction Brazed CBN Grains Using Ag-Based Alloy
Authors: Li Qi Lin , Xu Jiu Hua , Su Hong Hua , Tong Xin
Published: October 2013

Continuous induction brazing with ultra-high frequency was proposed to braze the monocrystalline CBN grains using Ag-based filler alloy. The interfacial microstructure of the brazed specimen and the resultant morphology on the CBN surface was investigated and analogized by scanning electron microscopy (SEM) and energy diffraction X-ray (EDX). The experimental results showed that the bonding among CBN grains, filler alloy and steel matrix was achieved. The CBN grains were well wetted by the filler alloy and formed a massive support profile. Moreover, the active element Ti of the filler diffused markedly and gathered in the interfacial of matrix/filler and filler/grain respectively. Due to the short dwell time in brazing, the newly formed resultants grew in a short time. The resultants layer did not entirely covered the CBN grain, and discretely distributed on the surface of CBN grain. The size of the resultants was less than 200nm.
Study on the Automatic Test Device of Airflow Performance in Refrigerator Transportation Vehicle
Authors: Wang Jia Min , Li Li Juan , Zhao Xin Xin , Huang Chuan Zhen , Jiang Zhao Liang
Published: October 2013

In order to test the environment inside the refrigerator transportation vehicle, a automatic test system of airflow performance is built based on monitor and control system of CAN bus. The parameters of flow field such as humiture, wind speed, wind direction and pressure can be collected movably, processed and monitored in realtime with the proposed system, which is helpful for the design and manufacture of refrigerator transportation vehicle.
Study on the Milling Technologies of Super-Slender Rod
Authors: Ren Wei , Yu Wei , Zhou Mao Su
Published: October 2013

t is well known that slender rod machining operation is a very difficult problem due to its low stiffness. During slender rod machining process, the deflection, vibration, cutting heat and cutting force of the machined part are the main reasons affecting the product quality. Based on the analysis of current research status of slender rod milling technology, process scheme, milling strategy, clamping fixture and tool designing is carried out in this work. In a roughing milling stage, we create a new strategy of square rod milling, called equilateral milling strategy to eliminating deflection. In finish-milling top waveform stage, a way using semicircle profile cutter to finish was applied. Complex interpolated movement is transform into simple two-dimension curved movement to shorten machine time and increase of efficiency in the way. In addition, machined surface with burnishing effect, high precision and high surface quality is obtained.
The Measuring Method of Uniaxial Force Induced Error on CNC Machine Tool
Authors: Liu Huan Lao , Chen Bao Yue , Li Xiao Li , Tan Guang Yu
Published: October 2013

The cutting force induced error has been more and more important as the increase of the cutting force, the hard cutting and hard cutting material used widely. The measuring system of uniaxial force induced error on CNC machine tool is put forward. the force application device is designed. Simulate the stress state of process system in the process of cutting. Get directly the value of the machine error. The uniaxial force induced error on CNC machine tool is measured by using the system. The research results provide the theoretical basis and method of measurement for uniaxial force induced error on CNC machine tool.
Effect of Nanograss and Annealing Temperature on TiO2 Nanotubes Based Dye Sensitized Solar Cells
Authors: Naduvath Johns , Shaw Santosh , Bhargava Parag , Mallick Sudhanshu
Published: October 2013

In TiO2 nanoparticle based dye sensitized solar cells (DSSC), the electron injected from the dye has to cross multiple interparticle boundaries in random directions before reaching the electrode. For application in DSSCs, the directional pathway for electron transport through the nanotubes is known to reduce the recombination rate. In the present study, titania nanotubes with nanograss layer have been fabricated by anodization of titanium foil in fluoride containing organic electrolyte. Dye sensitized solar cells with photoanode made of titania nanotubes covered with nanograsswas found to have a higher efficiency than ones made with only titania nanotubes of the same length.This can be attributed to enhanced dye adsorption on nanotubes with nanograss. The efficiency of DSSC using titania nanotubes is also affected by the annealing conditions such as duration, temperature.
Effect of Sintering Profiles on Titania Interparticle Connectivity, Electron Transport and Interfacial Resistance in Dye-Sensitized Solar Cells
Authors: Jena Ajay K. , Mohanty Shyama Prasad , Bhargava Parag
Published: October 2013

TiO2 films, which are often sintered at 450°C for 30 or 60 minutes for application in dye-sensitized solar cells (DSSCs), show no appreciable connectivity between the TiO2 particles. The present work deals with connectivity between TiO2 particles and its effect on electron diffusion and short circuit current density (Jsc) of DSSCs made from TiO2 films sintered at lower temperature for longer time (450°C, 550°C, 650°C for 60 minutes) and higher temperature for shorter time (450°C for 60 min followed by 700°C and 800°C for 10 and 20 minutes). TiO2 films sintered at higher temperature (700°C) but for shorter time (10 min) exhibited better connectivity between the particles with slight reduction in surface area. This caused faster transport of electron through the films sintered at 700°C/10 min than 450°C/60 min and 550°C/60 min and hence, resulted in highest Jsc (~ 7 mA/cm2). Films sintered at 650°C/60 min and 700°C/20 min showed better interparticle connectivity but had significantly lower surface area, dye loading and therefore, despite faster diffusion of electron in these films Jsc was measured to be lower. Sintering at 700°C/10 min following 450°C/60 min could be considered the best in terms of dye loading, electron transport and efficiency.
Dye Sensitized Solar Cell Using Natural Dyes as Chromophores - Review
Authors: Jinchu I. , Sreekala C.O. , Sreelatha K.S.
Published: October 2013

The molecular dye is an essential component of the Dye sensitized solar cell (DSSC), and improvements in efficiency over the last 15 years have been achieved by tailoring the optoelectronic properties of the dye. The most successful dyes are based on ruthenium bipyridyl compounds, which are characterized by a large absorption coefficient in the visible part of the solar spectrum, good adsorption properties, excellent stability, and efficient electron injection. However, ruthenium-based compounds are relatively expensive, and organic dyes with similar characteristics and even higher absorption coefficients have recently been reported; solar cells with efficiencies of up to 9% have been reported. Organic dyes with a higher absorption coefficient could translate into thinner nanostructured metal oxide films, which would be advantageous for charge transport both in the metal oxide and in the permeating phase, allowing for the use of higher viscosity materials such as ionic liquids, solid electrolytes or hole conductors. Organic dyes used in the DSSC often bear a resemblance to dyes found in plants, fruits, and other natural products, and several dye-sensitized solar cells with natural dyes have been reported. This paper gives an over-view of the recent works in DSSC using the natural dyes as chromophores.
A Critical Review on Mesoporous Photoanodes for Dye-Sensitized Solar Cells
Authors: Jyoti Divya , Mohan Devendra , Singh Amrik , Ahlawat Dharamvir Singh
Published: October 2013

Until breakthrough in 1991, commercialization of dye-sensitized solar cell (DSSC) has been a gradual process leading to a scarce production. A thorough study of dilemmas is needed to overcome the shortcomings of DSSC to make it stand against traditional silicon based solar cells. A DSSC is composed of important components including photoanode, dye, electrolyte and counter electrode. Among these photoanode is the focussed area of the presented article. The photoanode is a thin porous film of metal oxide semiconductor supported on to a transparent conducting oxide (TCO) glass. Extensive research in this field has revealed the photophysics of semiconducting electrodes like TiO2, ZnO and SnO2 etc. Selection of metal oxide for this purpose relies on crystallinity, particle size, and thickness of the film, surface area, dye affinity and porosity. These parameters related to the candidature of a particular metal oxide film as photoanode in DSSC have been discussed and optimized values have been quoted. The present study aims at emphasizing the history of DSSC as well as recent developments in electrodes, dyes and electrolytes in this specific area.
Plasmon Resonance Enhanced Zinc Oxide Photoelectrodes for Improvement in Performance of Dye Sensitized Solar Cells
Authors: Bora Tanujjal , Kyaw Htet H. , Dutta Joydeep
Published: October 2013

Nanocomposites of vertically aligned zinc oxide (ZnO) nanorod arrays incorporated with gold (Au) nanoparticles have been used as photoelectrodes to fabricate dye sensitized solar cells (DSSCs). Due to the surface plasmon resonance of the Au nanoparticles, the nanocomposite photoelectrodes demonstrate enhancement in the visible light absorption resulting in ~8% higher photocurrent compared to ZnO photoelectrode based DSSCs fabricated without any Au nanoparticles. In addition to the higher optical absorption due to the gold nanoparticles, a Schottky barrier forms at the ZnO/Au interface preventing the back electron transfer from the conduction band of the semiconductor nanorods to the redox electrolyte providing improvement in the charge separation at the nanocomposite photoelectrode. Upon incorporation of Au nanoparticles, the overall efficiency of the DSSC increased from 2.41% to 3.27%. The role of Au nanoparticles on the performance of the DSSCs for varying concentration of the Au nanoparticles as well as the post-growth annealing treatment of the nanocomposite photoelectrode is reported.