bluuebunny/crossref_metadata_2025 huggingface dataset:
Surface Roughness Predictive Model of UNS A97075 Aluminum Pieces Obtained by Dry Turning Tests Based on the Cutting Forces
Authors: Agustina Beatriz De , Rubio Eva María , Sebastián Miguel Ángel
Published: November 2012

The present work shows an experimental study for a first approach of a surface roughness predictive model of UNS A97075 aluminum pieces obtained by dry turning tests based on the cutting forces. In a first step, a design of experiments (DOE) 25 was employed to analyse the influence of the cutting parameters and type of tool on the surface roughness with the objective to find out a combination of cutting conditions that allow obtaining a range of values of surfaces roughness according to the aeronautical specifications requierements. The factors considered for this design were the feed rate, spindle speed, depth of cut, type of tool (nose radious) and machined length (zone of the workpiece where the surface roughness measurements are taken). The obtained data was analysed by means of the analysis of variance (ANOVA) method. And secondly, with the previous selected conditions selected it was developed by multiple regression a model to predict the surface roughness by measuring the cutting forces generated during the dry turning tests of aluminum alloy UNS A97075 pieces. The predictive model of surface roughness obtained includes statistical values calculated from the forces sygnal in time and frequency domains.
The Composition Forecasting Research for Cupola Melting Process
Authors: Zhou Jian Xin , Sun Liang , Shi Zhen Zhong , Wang Hong
Published: November 2012

This paper summarizes components and phases involved in the cupola melting process, then brings out a composition forecasting model based on the minimum Gibbs energy principle and the equilibria calculation algorithms of multiphase and multicomponent. Besides, the relationship between the melting parameters and the composition of molten iron is set up by using BP neural network based on the idea of indirect constraints. Finally, the paper probes the feasibility of the composition forecasting model with two examples. The application result shows that the prediction with this method can achieve strong practicability and popularization value.
Simulation and Experimental Analysis of Moulding Processes of Glass Diffractive Optical Elements
Authors: Chang Chia Jung , Chao Choung Lii , Chou Wen Chen , Chen Yu Kun , Ma Kung Jeng , Chen Chun Chieh
Published: November 2012

Driven by the huge market demand, the glass lenses made of various optical glasses are required to be more diversified in sizes/shapes, to have better form accuracy/ surface roughness, to be more environmental durable, and to be more competitive in price. In comparison to conventional refractive lens, diffractive lens (diffractive optical element, DOE) has the advantages of being thinner and lighter, and is widely used in optical systems such as lighting and photovoltaic systems. Glass moulding process(GMP) is regarded as a very promising technique for mass producing high precision optical components such as spherical/ aspheric glass lenses and free-form optics. However, only a handful of materials can sustain the chemical reaction, mechanical stress and temperature involved in the glass moulding process. Besides, almost all of these mould materials are classified as hard-to-machine materials. This makes the machining of these materials to sub-micrometer form accuracy and nanometer surface finish a rather tough and expensive task. As a result, making service life of mould longer has played a critical part in the GMP industry. The excessive stress and/or temperature involved in the moulding process are amongst the main reasons for pre-matured mould failure. This research aimed to analyze the stress/strain conditions and the obtained dimensional accuracy under various molding parameters by simulations. Molding experiments were subsequently carried out to verify the simulated results. A glass DOE of 14.8 mm in diameter and 3.36 mm in thickness are successfully produced in this research and the difference between the simulated and the molded DOE is around 15μm.
Numerical Investigation of Manufacturability of Various Compound Shapes Using Sheet Hydroforming Process
Authors: Dilmec Murat
Published: November 2012

The demand for complex sheet parts has increased more and more in the modern lightweight construction, especially in the automotive industry. Complex drawn sheet parts can be usually achieved in one step with using the hydroforming technology. As the demand for the complex products increase, the need of hydroforming process will greatly expanded around the world due to its many advantages. Complex parts have many convex and/or concave features on it. The shapes, dimensions and the positions of the features are important for manufacturing high quality products. So understanding these geometrical parameters on the product quality has great importance. In this study, the effects of the geometrical parameters of the complex stepped parts on the manufacturability by using sheet hydroforming process were numerically investigated for AA5754 aluminum alloy and some of results were experimentally confirmed.
Micro Hole Elliptical Supersonic Boring Quality Research
Authors: Wu Ji Liang , Zhang De Yuan , Jiang Xing Gang
Published: November 2012

In this paper a method of ultrasonic elliptical vibration cutting has been applied to precision boring of micro hole due to its superior performances such as low cutting force, high quality surface finish and long tool life. A transducer with the longitudinal excitation is carried out to machining(boring) micro hole of 1Cr18Ni9Ti workpiece. The cutting force and surface quality are studied in detail.The workpiece with surface roughness of Rz 0.4μm is achieved.The results showed that the ultrasonic elliptical vibration transducer can be applied rationally in micro hole precision boring.
Weld Quality Prediction for Resistance Microwelding of Fine Cu Wire Based on the Back-Propagation Neural Network
Authors: Mo Bing Hua , Pan Zi Nan
Published: November 2012

A neural network model is established to predict the joint quality in resistance microwelding (RMW) of fine Cu wire and stainless steel thin sheet. The preheat current, welding current, weld time and electrode force are selected as the input parameters and the tensile strength as the output parameter in the model. The prediction program is compiled in MATLAB through the detailed designing of hidden layer and the selection of the transfer function. The network performance is verified by experiment, and its accuracy meets the production requirements in the actual welding.
The Effect of Axial Cutting Edge Angle on the Axial Milling Force of Helical Milling
Authors: Zhang Shuo , Shi Rui Hang , Liang Xin Guang , Hu Yong Xiang , Yao Zhen Qiang , Zhang Hong Zhou
Published: November 2012

For decreasing axial milling force in helical milling and improving machining quality, researches have been carried out on end mills’ geometrical parameters. And experiments have also been designed to analyze the effect of end mill’s axial cutting edge angle on axial milling force. The results indicate that when other mills’ geometrical and process parameters are constant, the generated mean axial milling force is remarkably decreased, following the axial cutting edge angle’s little increase. In addition, as the pitch of helical milling path increases, larger axial cutting edge angle leads to higher relative decrease ratio. And a qualitative analysis is also put up to point out the reason for the phenomena above, that is, part of the low-speed region of axial cutting edge quits milling. These conclusions could supply valuable references to reasonable choice of combinations of mills’ geometrical and process parameters in helical milling.
Thermodynamic Parameters Analysis of MgS Superfine Inclusion in Grain Boundary
Authors: Zheng Shao Bo , Wu Chun Feng , Yang Cun Bo , Gong Yue , Li Hui Gai
Published: November 2012

Activity coefficients and concentrations of dissolved magnesium and sulfur in grain boundary are two essential parts for the calculation of the Gibbs free energy of MgS superfine inclusion in grain boundary. Activity coefficients of dissolved magnesium and sulfur in grain boundary are gained first by the use of Miedema Model and Free Volume Theory. Concentrations of dissolved magnesium and sulfur in grain boundary of Fe-matrix are gained by Mclean’s equation. At last the Gibbs free energy of MgS in grain boundary is -14.048KJ/mol in E-class ship plate steel at T=1363K. By comparing the values of the Gibbs free energy of MgS in grain boundary and that in grain interior, a conclusion can be come to that MgS superfine inclusions may form in grain boundary instead of in grain interior.
Tooth-Leap Shaping Method for Helical Gears
Authors: Wang Bao Ming , Mei Xue Song , Wu Zai Xin , Hu Chi Bing
Published: November 2012

In order to reduce cyclic variation in rotational speed of generated gears or shaper cutter induced by additional rotation during shaping, tooth-leap shaping method for helical gears was proposed. Based on fundamentals of helical gears shaping kinematics, principle of tooth-leap shaping for helical gears was introduced. Furthermore, mathematic models of tooth-leap shaping motions for helical gears are established. Finally, several examples are calculated, results show that cyclic variation in rotational speed of generated helical gear can be reduced largely by tooth-leap shaping method comparing with conventional shaping method. Consequently this method will make shaping motions of helical gears more smooth and improve the machining accuracy of helical gears.
The Effect of Vibration on the Surface Topography in Micro-Milling
Authors: Peng Fang Yu , Wu Jing , Yuan Shuai , Yan Rong
Published: November 2012

Optical freeform surfaces have a strict request on surface quality, but the vibration of tool , which is often ignored in previous studies, have a great influence on surface topography in micro-milling. This paper constructs a micro-milling motion model concerned with tool vibration, and the impact of tool vibration on feed-interval scallop in micro-milling is analyzed. The results show that tool vibration always lead to an increment of surface roughness; and vibration amplitude and feed per tooth are the major factors that have an effect on feed-interval scallop form and surface quality.
First Principles Calculation on Adsorption of S on Fe(100) with Different Pressure
Authors: Hu Xue Tao , Luo Qiang , Ran Zeng Ling
Published: November 2012

Using periodic density functional theory within the generalized-gradient approximation to electron exchange and correlation, we have studied S adsorption four-fold hollow site on Fe(100) in different hydrostatic pressure. We find that the adsorption height decreases with hydrostatic pressure increasing is non-monotonic. The adsorption energy decreases with an increase with pressure is monotonic and we have obtained density of states is almost unchanged, the adsorption energy change is mainly caused by lattice deformation in the hydrostatic pressure, and the adsorption energies increase linearly with pressure.
Precision Control Calculation Method and Forming Technology of Aluminum Alloy Base
Authors: Li Guo Jun , Ren Jin Ru , Zhang Zhi Min
Published: November 2012

The step size tolerance for the two-sided forming base complex parts is ±0.1mm, and sharp corners of and roots are required for the 12 vertical facades and edges. Therefore，it is difficult to guarantee the products quality by conventional extrusion. In this paper, the new calculation methods about scaling rates were adopted to control the size of the mould, and computer simulations were carried out for analyzing the forming processes for the extrusion. This method can meet the requirements of the product, improve the performance and material utilization rate, which might replace the machining methods used conventionally.
Test Study of Nickel-Base Superalloy 718 Superfine Deep-Hole Drilling
Authors: Liu Zhan Feng , He Sheng Ming
Published: November 2012

Nickel-base superalloy 718 is a new kind of materials that is difficult to drilling. In this paper, the superfine deep-hole (ø36×5440mm)drilling test is based on the material. This paper analyzes the causes and laws of the tool wear , tool breakage ,and the hole axis deflection from the blade material, tool geometry parameters, cutting parameters and drilling methods.
The Research on Fatigue of Crankshaft with the Method of Explicit Dynamic
Authors: Guo Chen Hai , Zhang Yong , Cao Xiao Hui
Published: November 2012

The crankshaft fillet rolling process is one of the commonly adopted methods in engineering to improve fatigue life of the crankshaft. The crankshaft fillet rolling process was simulated based on the explicit dynamic calculation in this paper. After the data acquisition program was compiled, the distribution of the crankshaft surface stress could be obtained. Coupling calculation between the operating stress at different bending moments and the rolling residual stress was based on the Smith-Watson-Topper (SWT) modle. After the simulation on the crankshaft fillet rolling process was carried out, which was based on optimization rolling parameters, the crankshaft fatigue strength was improved by 8.6%.
The Design of X-Ray Testing System of SMT Solder
Authors: Long Xu Ming , Cui Xiao Lu , Huang Hao , Xie Mei Jun , Peng Xu , Xia Hao Yan
Published: November 2012

An X-ray inspection machine image detection system is designed by making use of the software Visual C++ 6.0, in which a lot of noise in the X-ray image are filted out by using corrosion algorithms and median filtering method. A analysis software of the bridging of the solderjoints, weld situation is designed,which can real-time display and zoom the image of solder joint inspection, and can alarm.
Study of Solid Solution Treatment on Spray Deposited 7A04 Alloy
Authors: Su Rui Ming , Qu Ying Dong , Li Run Xia , Li Rong De
Published: November 2012

The Al-Zn-Mg-Cu (7A04) alloys were prepared by using the method of spraying deposition and the hot extrusion. The effects of two-stage solid solution treatment and single solid solution treatment on the microstructure and mechanical properties of spray deposited 7A04 alloy were investigated. The microstructure and mechanical properties were observed and tested by optical microscopy, SEM, X-ray diffraction and other methods. It is indicated that the two-stage solid solution treatment is better than the single. After the two-stage solid solution, the sizes of recrystallization grains were small and a lot of precipitations were dissolved. And the microstructure was nice by ageing treatment. The tensile strength and elongation of the alloy can respectively reach 740MPa and 5.8 percent by the two-stage solid solution (at 450°C for 1 hour and 475°C for 2 hours) and the aging treatment.
Grinding Performance of Metal-Bonded CBN Wheels with Regular Pores
Authors: Song Cheng Jie , Ding Wen Feng , Xu Jiu Hua , Chen Zhen Zhen
Published: November 2012

Metal-bonded cBN wheels with regular pores were fabricated using Cu-Sn-Ti alloy, cBN abrasive grains and alumina (Al2O3) bubble particles. Dressing experiments were carried out through rotary dressing method. Subsequently, grinding experiments were conducted on nickel-based superalloy GH4169. Comparative grinding performance was evaluated with vitrified cBN wheels in terms of grinding force and specific grinding energy. The results reveal that the pores in the working layer of the cBN wheels are exposed after rotary dressing. Compared to vitrified cBN wheels, grinding forces and specific grinding energy of the newly developed cBN wheels with regular pores are smaller.
FEM-Based Design and Analysis of a Smart Cutting Tool with Internal Cooling for Cutting Temperature Measurement and Control
Authors: Shu Sheng Rong , Ding Hui , Chen Shi Jin , Cheng Kai
Published: November 2012

Dry or clean cutting without the hazards of cooling liquid, and the ability to monitor thermal impact on cutting tools in real time have been very appealing to the manufacturing industries. This paper presents the FEM-based design and analysis of a smart cutting tool which possess dual functions of cooling the cutting tool with the internal cooling structure and estimating temperature at the tool tip by measurement of the cooling liquid’s temperature at the inlet and outlet of the cooling structure. To evaluate the performance and feasibility of the smart cutting tool, thermal modelling is carried out by commercial software - ANSYS and FLUENT. The numerical simulation results demonstrate that the novel tooling design concept can effectively reduce tool temperature away from the tool wear critical temperature zone and sensing the cutting temperature at the cutting tip.
Experimental Study on Drying Process of Green Body in Gelcasting of Metal Part
Authors: Liang Hui Huang , Wang Fei , Jiang Kai Yong
Published: November 2012

In this paper, gelatin was selected as binder, sodium alginate as dispersant. The slurries with low viscosity and high solid loading were prepared by mixing two types of 316L stainless steel powders with different particle sizes in proper mass ratios. The freeze drying process was adopted to treat the wet green body. The results show that the slurry with a solid loading as high as 58 vol.% can be obtained by mixing 316L stainless steel powders with mass ratio of fine particles to coarse as 4:6, which has better fluidity and densification. The viscosity of the slurry is less than 1Pa•s. After the freeze drying process, the bending strength of green body reaches 11.15MPa, the drying shrinkage is decreased to 0.44%, and the generation of crack can be prevented. The study results provide some helpful references for further research in rapid manufacturing of complex metal part.
The Technology of Multistage Extrusion for Thin Walled Brass Cylinder
Authors: Zuo Zhi Jiang , Yang J J , Fu L R
Published: November 2012

This paper analyzed the structure of the thin walled brass cylinder, calculated the deformation degree and extrusion ratio, and designed the multistage cold extrusion process. According to the cold extrusion process, the multistage extrusion mold structure and transfer device were designed. Compared with the stamping process, multistage cold extrusion process has high material utilization, high efficiency, small investment in equipment and other advantages of high strength, high precision and small surface roughness in parts production.
Influence of Inner Cooler on Flow of Molten Steel in Slab Continuous Casting Mold
Authors: Zhang Zhu , Jin Yan Juan , Zhang Jun Ting
Published: November 2012

In the paper a inner-outer couple cooling technology of molten steel for 1240×200mm slab continuous casting, that is to set an inner cooler-U shape pipes in the mold, is put forward in order to enhance the efficiency of transmitting heat and improve the flow status of molten steel. The flow status of molten steel in inner-outer couple cooling mold is simulated by using fluid dynamics software. It is found that setting inner cooler in the mold can make molten steel flow status even, which partly act as electromagnetic trig and is favorable to inclusion in molten steel floating up.
The Simulation and Experimental Analysis of Non-Abrasive Cryogenic Polishing on Metal Cylindrical Surfaces
Authors: Qu Shou Ping , Liang Tian Zhu
Published: November 2012

In the paper, the new machining process which was named non-abrasive cryogenic polishing will be introduced. The model of non-abrasive cryogenic polishing was set up. The dynamic simulation was analyzed by using Recurdyn. And the physical model was accomplished. By analyzing mass experiments, the ice tool material, metal material, rotate speed, polishing time and other parameters were found.
The Effect of Mill Temperature on the Texture and Microstructutre Evolution in Warm Rolled α-Brass
Authors: Chen Yong Jin , Guo Rang , Wan K. , Shi Q. , Duggan B.J.
Published: November 2012

At the entrance temperature of 300°C, the effect of mill temperature on the texture and microstructure evolution was worked to 85/15 α-brass by two rollings with mill temperatures calibrated as 28°C for one rolling and 55°C for another, in which TEM was employed to reveal the microstructures, and ODF to represent the related textures. From the experiment evidence, a detailed discussion was made and led to a conclusion: in current rolling, with recovery, mill temperature influences the rolling texture and microstructure development through chilling and the working temperature induced deformation mechanisms change, the former one affecting B intensities, by contrast, the latter one leading to a texture transition.
Numerical Analysis of Liquid Ammonia Storage Tank Welding Stress
Authors: Lei Zhang
Published: November 2012

Welding is the main means of the connection of tank, is also an important factor in determining tank quality. Applied Ansys software, finite element modeling, Choosed a reasonable heat source model to analyze the temperature distribution and variation of the weld, obtained the weld thermal stress distribution of the quantitative laws, it provides a good help to improve the security of the pressure vessel.
Numerical Simulation on the Multi-Point Forming of Sail Surfaces under Force-Displacement Separated Control
Authors: Wang Wei Wei , Chen Ze , Yu Jing Bo , Zhou Man
Published: November 2012

The forming and springback of sail surface during the multi-point forming under force-displacement separated control (MPF-FD) was studied. Numerical simulation method was adopted to study the springback of sail surfaces with different radius, sheet thicknesses and forming forces. The results show that the springbacks on two directions influence each other. The springback on the bigger radius direction is on the leading role, and will influence that on the smaller direction. On the direction of the bigger radius, the springback is decreased with the increase of sheet thickness, forming force and decrease of the radius. On the direction of the smaller radius, the springback is decreased with the decrease of the sheet thickness and the increase of the forming force, and the radius has a small impact on springback.
Automatic Segmentation of Pores in Weld Images Based on Transition Region Extraction
Authors: Tong Tong , Cai Yan , Sun Da Wei , Liu Peng
Published: November 2012

In allusion to the complex images of weld defects, weak contrast between the target and the background, a new segmentation method based on gray level difference transition region extraction is proposed. The paper analyzes the characteristic of weld defects, and then low-pass filtering and contrast enhanced are used to enhance the clarity. Finally, we extract the transition region and confirm a threshold for defects segmentation. The experimental results show that the method can extract the transition region more accurate, and segment the image much better in complex environment.
Prediction on Cutting Heat of the Simulation in NC Lathe
Authors: Li Jing , Jiao Yang , Wang Zhan Li , Huang Fu Zhi
Published: November 2012

Cutting heat and cutting temperature are the most important physical phenomena in cutting machining process. Cutting temperature and its distribution affect the abrasion of cutting tool and the operating life directly. Meanwhile they can affect the machining precision and the machined surface quality. In this paper the ABAQUS finite element software is used to predict the thermal distribution and variable condition, moreover it is tested through the experiment. As is shown from the result, the changing trend of cutting temperature by the simulation is consistent with the real measured result, which has better precision and reliability and supplies the theoretical basis for the deformation analysis caused by cutting heat in the cutting machining process.
Analysis of Microstructure and Micro Mechanical Properties for Weld Joints of 1000MPa Class Steel by Nanoindentation Technique
Authors: Peng Xing Na , Peng Yun , Wei Jin Shan , Tian Zhi Ling
Published: November 2012

Nanoindentation technique was employed to examine the nanohardness and elastic modulus of weld joints of 1000MPa Class high strength low alloy (HSLA) steel. The distribution of micro scales mechanical behavior was analyzed combined with microstructure observation by OM, SEM and TEM. It was shown that weld metal and base metal were mainly of bainite and their nanohardness is about 4.0GPa. In the heat affected zone, fine grained heat affected zone and coarse grained heat affected zone with lath martensite structure had the maximum hardness (above 4.75GPa). From inter critical region, the hardness of HAZ decreased to 2.5 GPa. However, the elastic modulus of metallic material is not much sensitive to the microstructure.
Minimum Quantity Lubrication (MQL) Using Ranque – Hilsch Vortex Tube (RHVT) for Sustainable Machining
Authors: Salaam Ha , Taha Zahari , Tuan Ya Tuan Muhammad Yusoff Shah
Published: November 2012

Ranque-Hilsch Vortex Tube (RHVT) is a device with no moving parts and do not require electricity or chemicals to function. It has been used widely in cooling and heating of various operations, thermal test, dehumidification, gas liquefaction, ice production and mixture separation. Sustainable machining refers to the efforts to reduce the environmental impact of machining. The use of minimum quantity lubrication (MQL) is an effective solution for a more sustainable machining process. In this paper we propose the use of RHVT in MQL. The structure, working principles and types of RHVT are presented in this paper. Parameters associated with RHVT and the various possible working fluids are discussed in brief.
Rapid Prototyping of Aerodynamics Research Models
Authors: Shun Simon , Ahmed Noor Alam
Published: November 2012

Rapid prototyping techniques are ideally suited to the manufacture of aerodynamics research models as these items usually consist of highly complex 3 Dimensional (3D) forms. The fabrication of complex curvatures on traditional Computer Numerical Control (CNC) machines often requires the production of additional tooling supports to allow for full machining of all surfaces. Such a necessity often results in extra cost and fabrication time, as well as a potential loss in accuracy due to any repositioning required to allow machining of internal and external features. It is often necessary to divide the model into additional sections to allow for the machining of internal features which can cause issues with mismatching of adjacent surfaces. The inclusion of small or complex internal features and hollow sections may be problematic if not impossible. In contrast, many rapid prototyping techniques eliminate most of these manufacturing issues due to the additive nature of modern 3D printing processes. Popular techniques for the rapid prototyping of polymers include Selective Laser Sintering (SLS), Fused Deposition Modeling (FDM) and stereolithography. The basic technique reduces a 3D object into a series of thin 2D slices. The 2D slices are then “printed” vertically in succession to produce the final 3D item The “slicing” technique is readily compatible with the formation of complex 3D curvatures as well as internal and hollow features. In addition, any required tooling supports are produced simultaneously with the desired item, which greatly reduces processing time and loss of accuracy due to part repositioning. The necessity to produce a model from multiple sections to allow access for machining of internal features can in many cases be reduced significantly. The characteristics intrinsic to many modern 3D printing techniques are greatly beneficial for the production of complex wind tunnel models made from polymer. The current work describes the design process and features of a wind tunnel model used for research into a novel aerodynamic flow control technique. An additive manufacturing technique was chosen as the most suitable for the rapid, accurate and simplest fabrication process for the model.
Supply Abrasive System of Premixed Abrasive Jet and Derusting Application
Authors: Liu Li Hong , Cao Huan , Zou Chen Qi
Published: November 2012

For premixed abrasive jet，abrasives loaded onto hermetic tank cannot enter the mixing chamber by use of negative pressure and weight and mix with water. A supply abrasive system of premixed abrasive jet was designed and the local flowing tributary was added. The test of supply abrasive and derust were carried. The test of supply abrasive shows the bigger the rate of water flow of the local flowing tributary, the bigger the rate of abrasive flow, and there is linear relation between with them. Regulate the rate of water flow of the tributary, abrasive flow may be controlled. The test of derust examined actual application of the supply abrasive system, and effects of the parameters of abrasive jet on derust performance. The results show the abrasive weight consistency and the flow rate are good. The parameters of abrasive jet are determined, the work pressure is 10MPa, the abrasive weight consistency is 30%, the rate of water flow is 30L/min.
Numerical Simulation for Technological Parameters of Vibratory Stress Relief in Large Welding Structures
Authors: Fu Jian Ke , Huang Xiao Hui , Xu Liang
Published: November 2012

In order to obtain the natural frequency, vibration mode and the curves of amplitude-frequency under two supporting ways, dynamic analysis was carried out on the large plane steel gate structures of a hydraulic projects. According to the Chinese machinery industry standard of vibration stress relief, technological parameters and effective range of vibratory stress relief were determined under two supporting ways. Some valuable references of determining technological parameters of vibratory stress relief for the plane steel gate structures and other momentous welding structures were provided through the research results and the conclusions.
The Adaptive Control of Grinding Force of CNC Cam Grinder Based on Neural Network
Authors: Xie Ming Li , Lu Ling
Published: November 2012

In the process of cam grinding, the fluctuation of grinding force can lead to the abnormal wear of the grinding wheel, the decrease of the grinding surface quality and even the damage of the grinding process system. The paper took the grinding process of numerical control cam grinding machine as research subject, the grinding force mathematical model was built, the indirect test and control measures were researched and an adaptive control method based on neural network was proposed and applied to the grinding force control of the cam grinding process. At last, the controller was designed and the grinding simulation was performed with MATLAB, which proved that the system could solve the fluctuation of grinding force during the process of cam grinding and the controller was equipped with good dynamic characteristic. The results indicate that the method can realize the purpose of optimal metal removal rate and enhance the grinding quality of cams.
Contribution to Milling of Materials on Ni Base
Authors: Mrkvica Ivan , Janoš Miroslav , Sysel Petr
Published: November 2012

This article deals with milling possibilities of nickel superalloy - Inconel 718. The different cemented carbides were applied for cutting process. These inserts were produced by Pramet Tools Ltd. company. This paper discusses durability of cutting inserts, the different intensity of tool wear at various cutting parameters. The most suitable cutting conditions are chosen in the scope of applied tools.
Advances in Theoretical Investigation of Work Hardening for Metal Cutting
Authors: Wang Su Yu , Yang Wen Jie , Ma Lin Lin
Published: November 2012

Work hardening reserches in metal cutting has an important significance in improving surface quality of the workpiece and the service performance of parts. The paper introduces current researches of the work hardening in metal cutting process, analyses the forming mechanism and influencing factors of the work hardening and discusses the effects of the work hardening on workpiece service performance. At last, the new trends of work hardening researches in metal cutting process are conclusively predicted.
The Sealing Welding of Helium-Filled Hole on Nuclear Fuel Rod
Authors: Liu Min Cai , Chen Fang Quan , Si Xiao Xia , Wang Biao
Published: November 2012

The welding which is used to seal the hole on the nuclear fuel rod is performed in a chamber which is filled with high-pressure helium. Experiments were done with different current and distance of tungsten and the end plug. Each current curve and voltage curve was analyzed. The results show that the effect of increasing the welding current or shortening the distance between the tungsten electrode and the end plug on the arc is that arc voltage is smaller and the arc stability is improved. The plan that positioning head is composed of two parts was put forward to control the fuel rod positioning accuracy. By means of properly choosing and controlling the parameters, the quality of welding is certainly improved and the rate of rejection is declined.
Effect of Different Contents of CeO2 on Microstructure and Properties of Roller Surface Alloyed by Laser
Authors: Yue Huai Jun , Liu Qi Bin , Feng Liang
Published: November 2012

To improve the service life of roller, a kind of alloying powder materials with CeO2 was designed. And the surface of roller was alloyed by a 5kW CO2 laser. The effect of CeO2 on microstructure and properties was studied by means of OM, Micro-hardness Testing Machine, Friction and Wear Tester. The experimental results indicate that addition of CeO2 into coating materials can refine and purify microstructure. Microstructure in alloying layer is coarse without CeO2, when CeO2 is up to 2.0wt.%, microstructure in alloying layer becomes finest. And microhardness and wear resistance become largest.
Study on Ausform Finishing Process and Gear Tooth Deformation for Hardened Gears
Authors: Li Yan Bin , Gao Hong , Jiang Tong , Zou Ren Song
Published: November 2012

An ausform finishing process that integrates heat treatment, rolling finishing and hardening of steel components into single on-line manufacturing operation is discussed in this paper ,with the gear steel 20CrMo which is widely used in auto and precise machine industry as a example .the tooth engagement process is modeled ,and the formulas for calculating deformation are deduced.
Research Status of High-Pressure Water Jet Incremental Sheet Metal Forming and Research on a New Method of the Straight-Walled Sheet Metal Part Forming
Authors: Zhang Ling Yun , Yuan Peng
Published: November 2012

The basic theory, process characteristics and advantages of high-pressure water jet incremental sheet metal forming were introduced. International research progresses in this field were summarized. The difficulty of straight-walled sheet metal part forming was analyzed, and a new method was researched, the result shows that the solution by regulating the contact angle which between sheet metal and water jet is practicable. The future developments were prospected.
Adaptive Model to Apply the Upper-Bound Theorem in Plain Strain Forging
Authors: Martín Fernández Francisco de Sales , Sevilla Hurtado Lorenzo , Camacho Ana Maria , Sanz A.
Published: November 2012

Present work applies the Upper-Bound Theorem (UBT) with Triangular Rigid Blocks (TRB) to metal forming compression processes like plane strain forge, offering an upper limit to required deformation energy. This analytical method, usually used by means of simplified models, is developed here incorporating different effects that impact in evolution of deformation process like shape factor and friction. By means of a new adaptive model, the shape and size of the rigid zones used for the UBT application are optimized according to the ratio of the width and the height of workpiece.
Welding Deformation Controlling for the Truck Rack Girder
Authors: Li Li Qin , Zhao Li Bin , Liu Xi Min , Wang Da Yu , Wen Xing Wang
Published: November 2012

This paper aims at the research on deformation control technology in truck rack girder. Welded deformation is minished through special welding fixture design and welding process control, thus to improve the size precision of the truck rack girder and ensure the running safety of the vehicle.
Synthesis and Luminescent Properties of Micro – Nanometer Ca0.69Sr0.23(PxMoy)O4:0.05Eu3+ by Co Precipitation – Melted-Salt Method
Authors: Yu Quan Mao
Published: November 2012

High luminescent intensity micro – nanometer Ca0.69Sr0.23(PxMoy)O4:0.05Eu3+ phosphor were synthesized by an innovative co precipitation-melted-salt (CPMS) method, Using Eu2O3, Ca(OH)2, SrCO3, HNO3, (NH4)6Mo7O244H2O, (NH4)2HPO4 and inorganic flux as raw materials, room temperature co precipitation and Melted-salt-calcination at 800°C. The results show that the Ca0.69Sr0.23(PxMoy)O4:0.05Eu3+ emits strong 615 nm red light ( exited by 285 nm UV), the luminescent intensity of phosphor is the highest when x / y = 1. The size of the dispersed phosphor is about 1.0 μm. The phosphors have great potential applied as photon conversion materials in Si-solar photovoltaic system and devices.
Experimental Investigation on Cutting Performance of Face Milling Cutter
Authors: Yan Bing , Li Yang , Wang Wei , Feng Hao
Published: November 2012

The cutting tool geometry and cutting parameters have a great impact on cutting force, while cutting force is an important factor which affecting the tool life. High speed cutting experiments have shown that when slight axial depth of cut is adopted, rake angle effect on main cutting force significantly. When cutting aluminum alloy, the roughness of machined surface decrease with increasing tool rake angle. The axial depth of cut does not have a big influence on machined surface ’s roughness.
Numerical Study of Transverse Impact Response of Single-Lap Adhesively Bonded Joint
Authors: Zhang Jian Guang , Zhang Zhen , Ma De Quan , Wen Yong Hai , Gong Shao Bo , He Xiao Dong
Published: November 2012

The response of adhesively bonded lap-joint under transverse impact was investigated by means of DYTRAN software. A finite element model was developed based on cohesive failure in the adhesive layer of the joint. It was found that transverse impact results in shear and peel stress concentration in the adhesive due to the considerable deflection of the joint. The stress distribution in the adhesive layer was asymmetric along the overlap length direction. The peel stress varies from tensile to compressive from one side to the other. Two cracks initiated at two sides of the adhesive layer were observed before the failure of the joint.
Finite Element Analysis of the Combined Effect of Strain Hardening and Friction in Elementary Processes of Forging
Authors: Camacho Ana Maria , Marín Marta María , Sevilla Hurtado Lorenzo , Bernal C.
Published: November 2012

Forging processes have been studied since years. However, recently these studies are gaining in importance because of the increasing emergence of non conventional forging processes such as LIF processes, in order to improve their efficiency and to fit the production requirements. In this work elementary forging processes are studied under plane strain conditions in order to evaluate the combined effect of strain hardening and friction in forces and contact pressure distributions by a FE analysis. For this purpose, different base to height ratios (b/h) of the workpiece have been considered, with different friction conditions. All cases have been solved for both a rigid perfectly plastic material and a strain hardened one. It is observed that the effect of the strain hardening on the forces and contact pressures is higher when the friction conditions become more extreme. The results do not depend on the base to height ratios when frictionless conditions are assumed.
Robust Process Design towards through-Silicon via Quality Improvement Based on Grey-Taguchi Method
Authors: Tang Chao Wei , Chuang Li Chang , Young Hong Tsu , Yang Mike , Liao Hsueh Chuan
Published: November 2012

The robust design of chemical etching parameters is dealing with the optimization of the through-silicon via (TSV) roundness error and TSV lateral etching depth in the etching of silicon for laser drilled TSVs. The considered wet chemical etching parameters comprise the HNO3 molarity, HF molarity, and etching time. Grey-Taguchi method is combining the orthogonal array design of experiments with Grey relational analysis (GRA), which enables the determination of the optimal combination of wet chemical etching parameters for multiple process responses. The concept of Grey relational analysis is to find a Grey relational grade, which can be used for the optimization conversion from a multiple objective case to a single objective case. Also, GRG is used to investigate the parameter effects to the overall quality targets.
Helical Drills Wear during Drilling of a New ELC Austenitic Stainless Steels
Authors: Jurko Jozef , Panda Anton , Behún Marcel , Berdis Andrej , Gecák Ján , Gecík Martin , Orendáč Peter
Published: November 2012

This article presents the results of experiments that concerned on the tool wear and tool wear mechanisms by drilling of a new Extra Low Carbon (ELC) austenitic stainless steel X02Cr16Ni10MoTiN. This article presents conclusions of machinability tests on new austenitic stainless steels X02Cr16Ni10MoTiN. The results of cutting zone evaluation under cutting conditions (cutting speed in interval vc=30-50 m/min, depth of cut ap=4.0 mm and feed f=0.02-0.08 mm per rev.).
Development of Mathematical Model for Chip Serration Frequency in Turning of Stainless Steel 304 Using RSM
Authors: Amin A.K.M. Nurul , Sulaiman Syidatul Akma , Arif Muammer Din
Published: November 2012

Chatter is defined as the self-excited violent relative dynamic motion between the cutting tool and work piece. Chatter is detrimental to all machining operations. In metal turning operations it leads to inferior surface topography, reduced productivity, and shortened tool life. Avoidance of chatter has mostly been through reliance on heuristics such as: limiting material removal rates (to stay within the dynamic stability boundary) or selecting low spindle speeds and shallow depth of cuts. However, the correct understanding of the mechanism of chatter formation in metal cutting reveals that chip morphology and segmentation play a predominant role in chatter formation during machining. Chatter is found to appear as a resonance phenomenon when the frequency of chip serration is equal to or integer multiple of the prominent natural frequency/frequencies of the system component(s). Hence, it is important to study the chip serration frequency. At lower cutting speeds the chip is often discontinuous, while it becomes serrated as the cutting speed is increased. It has been identified that the chip formation process at higher speeds also has a discrete nature, associated with the periodic shearing process of the chip. In this paper a statistical technique is proposed to predict the frequency of chip serration as a function of cutting parameters for two different tool overhang values in turning of stainless steel AISI 304 using Response Surface Methodology (RSM).
Investigation into Indirect Selective Laser Sintering Alumina Ceramic Parts Combined with Cold Isostatic Pressing
Authors: Liu Kai , Li Chen Hui , He Wen Ting , Shi Yu Sheng , Liu Jie
Published: November 2012

To obtain complex shape alumina ceramic parts, a composite powder of epoxy resin binder E-06 and alumina powder are laser sintered combined with cold isostatic pressing(CIP). An orthogonal experiment is carried out to probe the influencing factors of selective laser sintering (SLS) alumina green parts. When preheating temperature, laser power, scan speed, scan spacing and layer thickness are, respectively, 60°C,14 w, 2000 mm/s, 0.10 mm/s and 0.10 mm, the density and bending strength of alumina parts are relatively high. Then, airproof canning prepared for CIP is manufactured in the vacuum environment. Finally, the optimized SLS/CIP alumina parts are degreased and sintered in 1600 °C to produce crack-free alumina parts. The sintered relative density of the parts however is limited to only 57% but the forming integrity during SLS and CIP remains after sintering.
Variable White–Light Filaments Induced by Femtosecond Laser in PM567-Doped PMMA
Authors: Wang Wei Bo , Fan Rong Wei
Published: November 2012

Interactions of femtosecond–laser with various transparent media are great focused recently because of some interesting phenomena produced. This experiment is aimed to investigate super-comtinuum generation of femtosecond lasers (800nm, 1 kHz) with PM567-doped PMMA polymers. And we, to our knowledge, first founded: variable white light filaments in which spectrum changed from super continuum to pumped light spectrum. The circle structures of the variable spectrum are recorded and are analyzed in theory and experiment; moreover, the effect of interaction time on the filaments; last, founding PM567-doped PMMA has the properties of the Photorefractive crystal in the field of super-comtinuum generation.
Numerical Study on Strengthening Effect of Laser Shot Peening for Wrought Magnesium Alloy
Authors: Jiang Su Qin , Xu Hong Guang
Published: November 2012

Based on finite element method, the FEA model used for analyzing fatigue properties of sample treated by laser shot peening (LSP) was established. In order to research the influence of material intensity on LSP effect, two kinds of wrought magnesium alloys AZ31B and ZK60 with different intensity were chosen as object, the compressive residual stress and fatigue life after LSP were analyzed. After spring back analysis the elastic strain is released in material inner, the value of compressive residual stress was reduced; after LSP with 3 times, the fatigue life gains of AZ31B and ZK60 were 105% and 163%, respectively. The results show that strengthening effect of high intensity material treated by LSP is better than that of low intensity material.
Micro Dimple Fabrication on OFHC Copper by Laser Shock Processing
Authors: Li Kang Mei , Hu Yong Xiang , Yao Zhen Qiang
Published: November 2012

Micro dimples have been generally considered as a valuable texture which can improve lubrication and reduce wear of the sliding surfaces by acting as reservoirs of lubricants and grinding debris. Laser shock processing (LSP) is an innovative surface treatment technology which can modify metals and shape metallic parts accurately. In this study, a new process for micro dimple fabrication which could be called laser peen texturing (LPT) was proposed based on LSP. LPT experiments were performed on Oxygen-Free High Conductivity (OFHC) copper. Influences of experimental parameters on geometrical characteristics of micro dimples were investigated. It was found that after LPT, the pile up was generated around the dimple .The diameter, depth and aspect ratio of the micro dimples increase with the laser power density and repeated shock number, but all of them saturated gradually. From matellographic analysis, grain refinement was observed obviously beneath the dimple.
Laser Ablation of Ti-Al Alloy in Vacuum and Air Environments
Authors: Liu Yue Hua , Liu Xiang Dong , Chen Ming , Zhao Ming Wen
Published: November 2012

The time-resolved optical emission spectroscopy of Ti-Al alloy plasma produced by the Nd:YAG high-power laser pulses with wavelength of 1064nm was investigated both in air and vacuum conditions. The comparative studies gave detailed insights that the plasmas produced in air were much hotter and denser. The quantitative descriptions indeed suggested that a cascade avalanche process would be happen followed by air plasma firstly, before the laser impacting the target surface. On the other hand, the laser energy may be considerably attenuated via hotter and denser plasma, the amount of laser energy on the target surface remarkably decreased in air condition. In addition, at high-power laser irradiance levels, there was an auto regulatory area near the target surface and the plasma parameters tend to be saturated