bluuebunny/crossref_metadata_2025 huggingface dataset:
Development of Hot Stamping Front Pillar Reinforcement
Authors: Liu Bo , Liu Peng , Zhu Zhen Tao
Published: December 2014

The development process of hot stamping front pillar reinforcement is introduced from hot stamping material selection, hot stamping parts simulation analysis and hot stamping die processing and debugging process of the problems.This paper discussed the development and application of existing process problems in hot stamping parts. There are some suggestions for application of hot stamping parts in the end.
The Formability and Hot Stamping of Magnesium Alloy Sheets
Authors: Huang Guang Sheng , Wang Li Fei , Pan Fu Sheng , Ma Ming Tu
Published: December 2014

Mg alloy is a potential material to be used in automobile, especially in the stamping products. Through texture weakening, temperature increasing, strain rate decreasing, blank holder force controlling, lubrication choosing and so on, the formability of AZ31 magnesium alloy is improved so that the cold stamping on some simple products can be conducted. However, on the complicated products, hot stamping should be considered. Temperature has an important effect on the formability of Mg alloy sheet. As the temperature increasing, the strength of Mg alloys sheet decreases while the formability increases. Hot stamping process is an effective way to broaden the using of Mg alloys.
Innovations of Hot-Forming for Cost-Efficient Lightweight Solution in Car Body
Authors: Miao Xin Lei
Published: December 2014

More applications of hot-forming for cost-efficient lightweight solution will be considered in new car body projects of China. As a partner for hot-forming, ThyssenKrupp Steel Europe sets a 3-pillar development strategy from material, process and advanced component design for this demand. The detailed technologies and innovations are introduced together with application examples, to show how to realize the lightweight result with cost-efficiency.
Investigation of Hot Stamping Process of 22MnB5 Based on Metallo-Thermo-Mechanical Theory
Authors: Liu Yong Gang , Zhang Yun , Zhang Wu , Li Jun Wan , Wang Hong Bin , Gu Hai Rong , Jin Jia Chun
Published: December 2014

In this study, based on the metallo-thermo-mechanical coupling theory, a FEM model of hot stamping including forming and quenching is built to investigate the cooling behavior and the microstructure evolution, and to predict the final mechanical properties of hot-stamped components. The results show that, after about 16s, the temperature of the entire component is lower than Mf of 22MnB5 boron steel and with a continuous uniform distribution. Most of austenite in component has transformed into martensite. To satisfy the required mechanical properties, the sufficient holding time of quenching in die is essential and it plays an important role in ensuring the required hardness. The predicted Rockwell hardness of component after hot stamping process is almost 512HV, which shows a good agreement with the experimental results. It implies that the metallo-thermo-mechanical numerical model established in this study is reasonable and reliable, which can provide a theoretical guidance for optimizing the hot stamping procedure.
Numerical Analysis on Bullet Penetration Resistance of Heat Treated Lightweight C-Grade Bulletproof Steel Plates
Authors: Ma Ming Tu , Zhang Jing Wen , Zhang Jun Ping
Published: December 2014

Bulletproof steel plates are widely used for the safety of special vehicles. This paper mainly researches on bullet penetration resistance of heat treated lightweight C-grade bulletproof steel plates through numerical analysis. Based on the flow behavior of bulletproof steel plates and bullet at various high strain rates, finite element (FE) model has been set up in the ANSYS/LS-DYNA software. The simulation results are compared with the shooting results, which show a good consistency and a high reliability. Therefore, the simulation results are efficient approaches and methods to decide and select mechanical property and thickness of bulletproof steel plates. It can save a lot of works and costs of experiments.
Analysis of the Design and Mechanical Performance about Hot Stamping Power Fitting Products
Authors: Zhou Ming Lin , Wang Liang , Wang Zi Jian , Wang Yi Lin , Zhang Yi Sheng
Published: December 2014

Hot stamping ultra-high strength steel not only plays an important role in automotive field, but also has potential application in transmission line fittings industry. According to the current development status of Chinese electrical power fittings and the demand for new technique, combined with hot stamping technology, a new solution for reduction of weight in transmission line fittings has been proposed. This paper focuses on a new lightweight connection fitting with multilayer stack structure of ultra-high strength boron steel, and the key issue in design and manufacturing process of the deep U-shaped hot stamping stacked steel sheet. Numerical simulation method combining the experimental data is also used to predict mechanical performance of the new connection fitting, which provides guidance for the manufacturing process.
The Parametric Design of Cooling System of Hot Stamping Die
Authors: Xian Xiang Dong , Wang Yi Lin
Published: December 2014

This paper puts forward to develop a software tool for parametric design of cooling system of hot stamping die based on UGNX platform. The hot stamping die is divided into several modules based on the characteristics of design processes, including loading die template, designing working parts and designing cooling system. As the most important module, the functional characteristics and design processes of cooling system are mainly introduced, and the optimization design of cooling channels are analyzed based on parametric design of cooling system.
Thermo-Mechanical Forming Analysis and Mapping of Material Properties in Press Hardened Components with Tailored Material Properties
Authors: Bergman Greger , Berglund Daniel , Isaksson Kenneth
Published: December 2014

A finite element model for failure prediction has been used for axial compression simulation of a front side member beam with tailored material properties. A corresponding experiment has been performed. The numerical simulation is divided into forming, mapping and axial compression. The coupled thermo-mechanical hot stamping simulation includes an austenite decomposition model that accounts for carbon segregation. In the mapping step, the phase composition is first mapped and then translated into global stress-strain curves and failure parameters using two different models. An elastic-viscoplastic material model including mesh size dependent localization and crack initiation with a ductile and shear fracture model is used in the axial compression simulation. The simulation shows acceptable agreement with the experimental results.
Local Design and Near Net Shape Optimization of Typical Ultra-High Strength Steel B-Pillar in Hot Stamping
Authors: Xu Ya , Wang Chao , Wang Yi Lin , Zhang Yi Sheng
Published: December 2014

Due to the deep drawing structure and box-shaped design in hot stamping, the typical ultra-high strength steel B-pillar was reasonably optimized to eliminate wrinkles in big end, assure the blank in the right position and meet the requirements of assembly. The finite element inverse algorithm was used to reverse the original blank of optimized part and production experiments of full-scaled part were performed to analyze the effect of optimized blank on the forming process.
Simulation Study on the Austenisation and Cooling Behaviors of the Medium-Mn Steel
Authors: Chen Si Lian , Bao Yao Zong , Dong Han , Cao Wen Quan
Published: December 2014

The austenisation and quenching behaviors of a medium-Mn steel with a chemical composition of C 0.14% and Mn 5.0% were presented in this paper. The heating and holding temperature varied from 500OC to 950OC was applied to find the austenization temperature. The holding time varied from 1-5minutes was used to choose the suitable austenisation time. Air cooling were applied to check the hardening capacity of the studied steel. It was found that the tensile strength is lower than 900Mpa and total elongation varied from 20-30% when the austenisation temperature is lower than 700OC. However, the tensile strength could be high up to 1600MPa and the total elongation about 12% when the austenisation temperature is higher than 700OC with air cooling. Based on the low austenisation temperature and the air hardening capacity, it was proposed that the studied medium-Mn steel could be used as the hot stamping steel in the car industry.
Spring-Back Control in Automotive Door Inner Panel Stamping
Authors: Zhang Peng , Wang Cheng Yong , Lu Zhi Bing , Wang Si Yan
Published: December 2014

The spring-back defect of the front door inner panel is a major technical issue during the automotive body manufacturing processes. The primary purpose of this study is to control the spring-back value of the door inner panel by optimizing geometric parameters of addendum surface and selecting appropriate forming process. The Inverse Approach is employed to analyze the formability of the panel and to acquire rapid amendment of the die face design. Two kinds of forming processes are conducted, respectively, one-step forming method and two-step forming method. The results show that the one-step forming process combining with the optimized addendum surface can reduce the spring-back amount of side wall regions on door panel less than 2mm. The proposed optimizing scheme was verified by multiple trial-producing.
Solutions for Hydrogen-Induced Delayed Fracture in Hot Stamping
Authors: Lu Hong Zhou , Zhang Shi Qi , Jian Bian , Mohrbacher Hardy , Guo Ai Min
Published: December 2014

One of the main targets in automotive industry is to reduce the weight of vehicle as well as increase the safety. To accomplish this goal, press-hardening steel and hot stamping parts have been used in car body. However, the possibility of hydrogen-induced delayed fracture (HDF) of hot stamping parts exits, which will decrease the car’s passive safety. A solution has been presented to reduce the sensitivity of HDF and improve hydrogen-induced delayed fracture resistance (HDFR) by Niobium micro-alloying technology. Traditional press-hardening steel 22MnB5 and new steel 22MnBNb2, 22MnBNb5 and 22MnBNb7 were studied, and it is shown that the appropriate addition of Nb is beneficial to the improvement of the delayed fracture resistance of the hot stamping steel, which indicates that Niobium micro-alloying technology is an effective solution to the HDF in hot stamping steels.
Localization on Technologies and Equipments of Hot-Stamping
Authors: Yang Xu Jian , Wang Wei Wei , Zhao Hong Yun , Ren Xiao Qi
Published: December 2014

This paper introduces the process and main equipments of hot stamping. The equipments composition of hot stamping production line, the equipments’ performance features and key technical indices are described in detail. The parts’ microstructure and mechanical properties after hot stamping are presented. It has been proved by practical production that the key technical indices of the domestic hot stamping production line, which has completely independent intellectual property, has reached the level of advanced products in the developed countries while has obvious cost advantage.
Research on the Ultra High Strength Steel Thermoforming Protective Atmosphere Heating Furnace
Authors: Wang Zhan Jun , Hou Jun Qing , Zhang Wen Liang , Hu Bo , Wu Xiao Lin , Wang Cheng Cheng
Published: December 2014

This paper studied protective atmosphere furnace used in the thermoforming production line of ultra high strength steel plate, simulation and analysis for the key technologies and structure of furnace have been made, and two patents formed (ZL201320006066.2, ZL201320007455.7). 1, Research and develop the structure of roller and its ends for heating furnace; 2, the heating process of furnace has analyzed and calculated, the protective atmosphere furnace developed fully meet the requirements of high-strength steel thermo-forming production line; 3, the mixture of high-purity nitrogen and dissociated methanol gas was used as the protect atmosphere, It has been verified the effect of protective atmosphere system is good. The high-strength steel plate protective atmosphere furnaces and production lines, we developed, has independent intellectual property rights, the properties and surface quality of thermoformed steel plate are good.
Furnace Technologies in Hot Stamping Concepts and Experience from Production
Authors: Fuchs Thomas , Ebner Fritz Josef
Published: December 2014

Nowadays, a furnace designer has to meet the demands of the customer precisely to allow economical production at site. Repeatable high quality throughout millions of produced parts combined with high cost efficiency is needed to stay competitive. Thus the facility has to be changed from a black-box to a glassy furnace which records and controls all important process values that define the properties of the produced parts and the consumption of the facility. Current furnace designs offer a wide variety of layouts with unique advantages and disadvantages. Single type furnace designs are well known and need the lowest investments but they also take up a lot of space and do not offer a back-up solution during maintenance or in the event of malfunctions occurring. Twin type furnaces have a higher degree of flexibility as they still allow 50% production during downtime caused by maintenance or malfunctions, so availability is higher than with single type furnaces. Double layer furnaces, which are stacked versions of the twin type furnaces, only need half of the floor space but maintenance is more complicated on the upper level. An oxygen-free furnace atmosphere is essential for the production of components in process atmosphere in order to ensure high quality results with the minimum of scale and other surface defects. This is not possible in a multi-level furnace.
The Application of Toggle Mechanical Press in Hot Forming of High Strength Steel
Authors: Fan Suo , Mo Jian Hua , Wang Zong Qiang
Published: December 2014

This paper discusses mechanical digital servo press control system and operating characteristics and adaptability to the hot forming requirements of high strength steel using the toggle mechanical presses [1-4]. A servo motor drive control strategy is made to adapt the stamping process. This paper describes results acquired by applying toggle mechanical servo press developed by author to the hot forming of high strength steel [5-7].
Hand-Held Blue Light 3D Measurement Technology and its Application in Hot Stamping
Authors: Zhan Guo Min , Li Zhong Wei , Liu Xing Jian , Zhong Kai
Published: December 2014

Over the last few years hot stamping for its high strength, lightweight characteristics has developed at an alarming rate, At the same time the measurement process a higher demand. Compared with the traditional three-dimensional coordinate measurement, Hand-held Blue structured Light 3D measurement technology for its fast, high precision, good flexibility, etc., has become the best choice of high-strength steel stamping in non-contact 3D measurement and accuracy detection. This paper developed a set of holding blue light 3D measurement system. The system project blue structured pattern to the surface of the object, and captured by two high-speed cameras synchronized. Then using the grabbed pictures reconstruct 3D topography of the object. Blue light projection technology can eliminate the use of influence of different surface reflectance measurement accuracy, So that a single measurement accuracy of 0.02mm, overall measurement accuracy of 0.05mm / m, Single measurement time is less than 0.12 seconds. This measuring system can be widely used in the rapid detection of various types of three-dimensional measurement and precision casting.
Application of Magnetic Barkhausen Noise Test System in Hot Stamping
Authors: Luo Xiao Yu , Zhang Yu , Wang Yi Lin , Zhang Yi Sheng
Published: December 2014

Hot-stamped high strength steel (HSS) is widely used in body structure as a solution for weight-reduction of automobiles. In order to realize fast field measurement of mechanical properties of hot-stamped HSS parts, a magnetic Barkhausen noise (MBN) test system was developed. The system was used to measure hardness of hot-stamped bumper beam and strip with tailored properties. Results show good precision and convenience of the MBN method.
Martensitic Stainless Steel as Alternative for Hot Stamping Steel with High Product of Strength and Ductility
Authors: Wang Li Jun , Liu Chun Ming
Published: December 2014

Though more and more structural and safety automobile components are manufactured using hot stamping technology for the advantage of excellent shape accuracy while producing ultra high strength parts without any springback.Fewer hot stamping steels are developed except 22MnB5 steel, which exhibits ultra-high strength but limited ductility. Inspired by the application of quenching and partitioning C-Mn-Si steel, the microstructure and properties of a 30Cr13 steel subjected to quenching and partitioning treatment were studied to evaluate the possibility of martensitic stainless steel as alternative for hot stamping steel with high product of strength and ductility. The experiment result shows that, enhanced mechanical properties of Rel=1350MPa, Rm=1740MPa, and A=17.5% can be achieved through appropriate treatment. Due to the unique phase transformation conditions of martensitic stainless steel, processing parameters and corresponding equipments for automobile components manufacturing have to been investigated.
Microstructure and Mechanical Properties of 0.15C-1.5Mn-0.3Si Steel Treated by Quenching and Partitioning Process
Authors: Jing Cai Nian , Fan Ji Chao , Xu Shu Bo , Zhang Yi Sheng
Published: December 2014

In this paper, the microstructure and mechanical properties of 0.15C-1.5Mn-0.3Si steels after quenching and partitioning (Q&P) process was studied. The microstructure of experimental steels was characterized by optical microscope (OM), scan electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffraction (XRD), and mechanical properties were performed through uni-axial tensile tests. The microstructure evolution during Q&P process was also discussed together with mechanical properties. The investigated steels show excellent strength and ductility product of 10.76GPa% with retained austenite content of 11.08%. The microstructure mainly consists of lath martensite and retained austenite at room temperature, which promotes persistent work hardening during deformation.
A Study on the Relationship between Hardness and Magnetic Properties of Ultra-High Strength Steel
Authors: Zhang Yu , Wang Zi Jian , Wang Yi Lin , Zhang Zhi Jian , Zhang Yi Sheng
Published: December 2014

Magnetic nondestructive testing methods including eddy current testing, magnetic memory, magnetic Barkhausen noise and so on are widely used in testing mechanical properties of ferromagnetic parts. Experiments were done to study the relationship between hardness and magnetic properties of ultra-high strength steel (UHSS), which plays an important role in automobile industry. The magnetic properties of UHSS specimens with different hardness were studied. The result shows that there is a strong connection between hardness and magnetic properties. Coercive force of UHSS is proportional to the hardness. This can be used to explain certain mechanism of magnetic nondestructive testing method such as connection between hardness and Barkhausen noise.
Evaluation of Durability of Mineral Wool Products
Authors: Zhukov Alexey , Bobrova Ekaterina , Smirnova Tatiana
Published: December 2014

Durability of building structures is one of the most important issues in modern construction. It depends on the all materials which the construct comprises. Thus durability of structures determined by the thermal insulation properties. Using of express methodologies for assessment operational stability of insulation materials allows to obtain reliable results and save time and resources.
Parallel Heat Transfer Model of a Panel with Phase Change Material for Thermal Storage Applications Computed on Graphics Processing Units
Authors: Klimeš Lubomír , Charvát Pavel , Ostrý Milan , Stetina Josef
Published: December 2014

Phase change materials have a wide range of application including thermal energy storage in building structures, solar air collectors, heat storage units and exchangers. Such applications often utilize a commercially produced phase change material enclosed in a thin panel (container) made of aluminum. A parallel 1D heat transfer model of a container with phase change material was developed by means of the control volume and effective heat capacity methods. The parallel implementation in the CUDA computing architecture allows the model for running on graphics processing units which makes the model very fast in comparison to traditional models computed on a single CPU. The paper presents the model implementation and results of computational model benchmarking carried out with the use of high-level and low-level GPUs NVIDIA.
Analysis of Mechanical Properties of a Fibre Composite Containing Secondary Raw Materials
Authors: Jogl Marcel , Reiterman Pavel , Holčapek Ondřej , Vogel Filip , Kolář Karel , Koťátková Jaroslava
Published: December 2014

Fundamental tasks of material engineers are the application of materials, which can be manufactured from the less valuable materials with conservation or increasing of final properties, predominantly higher strength and durability. Present paper contributes to the category of experimental research of special composites development. Article describes the application of secondary raw materials for the production of special fibre-reinforced composite for high temperature application. These secondary raw materials are arising by the recycling of waste produced in the building industry or by the recycling of cast-off materials. Aim of performed experimental program was to prepare lightweight refractory materials based on aluminous cement with sufficient mechanical properties. Application of secondary raw materials could be interesting solution with environmental benefits. Investigation of new type of fire resistant composites were realized on the base mechanical properties determination after high temperature exposure.
Accelerated and Natural Weathering of Wood-Polypropylene Composites Containing Pigments
Authors: Hyvärinen Marko , Butylina Svetlana , Kärki Timo
Published: December 2014

In general, wood-polymer composites are vulnerable to weathering factors such as UV radiation, moisture, freeze-thaw action. Weathering can cause discoloration, chalking, dimensional change, and loss of mechanical properties of wood-polymer composites. This comparative study was focused on weatherability of wood–polypropylene composites made with and without pigments. Two types of inorganic pigments were applied: carbon black master-batch and synthetic iron oxide. Wood-polypropylene composite made without pigment was used as a reference. Also, composites prepared with addition of wollastonite were tested. The composite samples were exposed to outdoor weathering and in a parallel the accelerated UV weathering was conducted in xenon weathering chamber for the 2000 hours. The colour change was estimated by spectrophotometric method, and the change of Charpy impact strength after weathering was determined. The surface morphology was studied with scanning electron microscopy (SEM). The addition of pigments decreased the lightness of non-weathered composites. The change of lightness and total colour change of weathered composites were affected a lot by type of pigment and method of weathering. As, expected wood-polypropylene composite made with carbon black showed the best results in colour stability of composites exposed to weathering. SEM showed that accelerated weathering in the xenon chamber caused more significant changes in the morphology of the polymer surface layer of the composites than outdoor weathering. Charpy impact strength of all studied composites was found to retain after 2000 hours of outdoor weathering, although accelerated weathering caused significant reduction of Charpy impact strength of these composites.
A Study on Nanosilver Adhesive for LED Light Application
Authors: Park Hyun Bum
Published: December 2014

This study proposes a development for the nanosilver adhesive, which is applicable to high efficiency LED light. The important issue of LED light is heat exhaust from LED. Generally, the middle area of LED light is increased up to 380K. Therefore, the bottleneck between LED chip and heat sink are caused by high temperature. In this work, the adhesive material between LED Chip and heat sink was newly developed for improvement of bottleneck. The nanosilver was adopted to solve heat problem of chip on board package for LED light. In order to evaluate the performance of the nanosilver adhesive, the thermal analysis was performed. Moreover both adhesive performance and heat exhaust were verified through the prototype test. From the experimental test results, it is found that the developed nanosilver adhesive has the high performance.
Research on Wheel Loader Duty Cycle Test and Numerical Expression
Authors: Zou Nai Wei , Wei Yu Ting , Zhou Da Shuai , Miao Yong Feng
Published: December 2014

A method to establish duty cycle was proposed based on wheel loader operating characteristics and features. Firstly, wheel loader operating characteristics, energy consumption and power distribution rules were summarized theoretically. Wheel loader energy consumption rules were explored through operating test. The features were extracted from testing data which can represent wheel loader operating rules. Finally, the duty cycle was composed according to the rules features arose in the actual operating test. The duty cycle will provide support for data files for hybrid wheel loader power system matching, computer simulation and dynamic analysis. Furthermore, the duty cycle will be helpful for traditional wheel loader dynamic matching, simulation analysis and numerical optimization.
A Comparing Study on Voltage Support Ability between STATCOM and Generator
Authors: Yang Yin Guo , Yuan Zhi Chang , Chen Rui , Lin Jian Xi , Tan Wei
Published: December 2014

STATCOM and synchronous generator are considered as measures of providing dynamic reactive power to power grid. Based on a real regional power grid, ability of voltage support between STATCOM and generator are compared through digital simulations. The results shows that STATCOM always provides additional reactive power to persist voltage collapse, while ability of generator reactive power are restricted by terminal voltage under faults.
Taihe Circuit, a Novel Circuit Topology for Conversion from Single-Phase to Three-Phase
Authors: Zhu Yong Qiang , Guo Wen Rui , Wang Guan Jie , He Guang Quan , Wen Ya Feng
Published: December 2014

This paper presents a brand-new splitting phase topology based on three-phase full-bridge inverter, which is named ‘Taihe Circuit’. This circuit topology resembles the traditional three-phase full-bridge inverter except for the direct connection of its two-phase output with the two terminals of the one-phase power source. Its operating principles are as follows: one-phase power source first charges the DC capacitor through three-phase full-bridge inverter in a small time period. After the voltage of the DC capacitor reaches stability, three-phase full-bridge inverter can output three-phase symmetrical AC voltage. The average power of the one-phase AC source equals to the power consumed by the three-phase symmetrical load, and the fluctuation of the power of the AC source corresponds to the charge and discharge of the capacitor on the DC side of the inverter. This circuit topology can achieve the conversion from one-phase AC source to three-phase symmetrical AC source when knowing three-phase load and can be used cooperatively with other circuits in some situations. In comparison to traditional scheme, a combination of one-phase rectification and three-phase inversion, the proposed brand-new topology requires less power electronic devices, as is more economically practical. As a final note, feasibility of the topology is verified through simulation.
Eco Hybrid Scooter
Authors: Bansal Gourav , Chadha Shubham , Gupta Sheifali , Gupta Rupesh
Published: December 2014

This paper introduces the novice concept of “Eco-hybrid Two wheeler” which is a combination of two systems i.e. petrol and electric system. This hybrid vehicle will make use of both technologies. Petrol system will be used for rear wheel drive and the electric system for front wheel drive. The batteries will be automatically charged when the vehicle runs on petrol system and that stored power will further be used for running the vehicle on electric system and so running of vehicle on electric system will be free of cost and pollution free also. The most attractive thing is that the batteries can also be recharged from electric supply.
Static Characteristic Analysis of Pneumatic Planar Flexible Bending Joint
Authors: Liu Hong Bo , Geng De Xu , Zhao Yun Wei , Liu Xiao Ming , Wu Guang Bin
Published: December 2014

This paper introduces the structure and working principle of planar flexible bending joint .It uses compressed air to drive the deformation, which can realize elongation and bending. On the basis of force and torque balance analysis, the relationship between the elongation and bending angle of joint and the air pressure are acquired. Experimental system is constructed on the static experimental device. Due to the errors of manufacture technology, the correction coefficient is introduced. The statics model can better reflect the process of movement after introducing a correction factor.
Precipitation Behavior and Magnetic Properties of Nanoscale Particles in a Cu–10 at% Ni–5 at% Co Alloy
Authors: Lee Dong Hae , Takeda Mahoto , Takeguchi Masaki , Bae Dong Sik
Published: December 2014

We investigated the relationship between the microstructure and magnetic properties of a Cu–10 at% Ni–5 at% Co alloy by using a transmission electron microscope (TEM), a SQUID magnetometer and a magnetic thermo–balance. TEM observations were performed to examine the microstructures of the Cu–Ni–Co specimens annealed at four temperatures between 873 K and 1073 K below and above the Curie point (983 K).Particles with cubic shapes were linearly arranged along the <100> direction of the copper matrix in specimens prepared by isothermal annealing at temperatures below the Curie point, while octahedral precipitates were sparsely formed by annealing above the Curie point. The TEM observations confirmed that the microstructural evolution in the Cu–Ni–Co specimens isothermally annealed at 1023 K. Although coherent cubic particles appeared at the initial stage of annealing, incoherent precipitates were finally formed with increased annealing time at 1023 K. The present SQUID measurements indicated that the curve of coercive force vs. annealing time had a peak at a short annealing period.
Efficient CPS Method for Improving the Sampling Resolution of Periodic Signals
Authors: Yeh Yun Chi , Lin Liuh Chii , Chen Yuan Dong
Published: December 2014

Based on existing analog to digital converters (ADC), this study proposes a simple and reliable controlled phase shift (CPS) method to improve the sampling resolution of a periodic signal. The proposed method uses phase shifted sampling sets of a sequence of sampled periods to increase sample resolution. When combining these sets, the period is virtually sampled with a higher number of samples. The lower sampling rate (per period) alleviates the requirements to be imposed on the conversion time of the ADC. Under the original conversion time of ADC, the proposed method can provide more sampled signals. Experimental result shows the proposed CPS method can improve the sampling resolution of periodic signals.
Multi-Objective Optimal Power Flow Solutions Using Differential Search Algorithm
Authors: Srikun Isaree
Published: December 2014

This paper presents a Differential Search Algorithm for solving a multi-objective Optimal Power Flow (OPF) in support of power system operation and control . The multi-objective OPF was formulated for tackling with total generation cost and environmental impacts simultaneously. The proposed method was applied to the standard IEEE 30-bus test system. The results show that solving the multi-objective OPF problem by the Differential Search Algorithm is more effective than other swarm intelligence methods in the literature.
A Weighted Centroid Localization Algorithm Based on RSSI and Virtual Static Beacon Nodes
Authors: Li Ying Kang , Shao Hua Gang , Ni Sheng Zhe
Published: December 2014

A large number of beacon nodes will be applied to the weighted centroid localization algorithm, but too much hardware facilities will affect the efficiency of the algorithm. Using the cosine theorem, On the basis of the original beacon nodes, add some virtual static beacon nodes to participate in orientation, It can reduce the hardware cost required for positioning. In addition, the math on and analysis of the localization algorithm, by derivative principle explaining the weight coefficient and RSSI ranging influence on localization algorithm. Simulation experiments show that the weighted centroid algorithm based on VSBN needed fewer beacon nodes, high positioning accuracy.
Improvement of Paint Thickness in Electro Deposition Painting Process of Truck Manufacturing
Authors: Khumgorn Sasithorn , Osothsilp Napassavong
Published: December 2014

The objective of this research is to improve process capability and reduce production cost related to thickness of paint from Electro Deposition Painting (EDP) process. To achieve the objective, Six Sigma method was applied to find out the optimal setting of significant process factors, which are concentration of pigment in EDP paint, dipping time, and dipping voltage. Design of experiment technique with Central Composite Design type helped indicate the optimal setting of the three factors, which yielded the target EDP coating thickness with a minimal production cost. With this optimal setting, the process capability index (Cpk) increased from 0.61 to 1.99, and the production cost is expected to reduce by 1,730,498 THB per year.
Improve Urban River Water Quality by Integrating Water Resource Management into Urban Construction
Authors: Meng Zhen Zhu , Tang De Shan , Wei Yu Hang , Ding Yi Fan
Published: December 2014

Increasing population and urbanization pose more and more threats to urban river. Integrated Water Resources Management (IWRM) is possible framework to solve water resource management problems through cross-sectional cooperation, but the vagueness in this concept make its application difficult. This paper focuses on urban river management practices in China and classified the government-guided cross-sectional urban river management projects to a special pattern of IWRM (GIWRM). It is proved to be effective in synthesizing efforts of different government departments, industry and the public and improve the urban river conditions a lot.
Alternate Materials for Glass Fibre
Authors: Kendre Rameshwar
Published: December 2014

Over the years, there is significant development in the field of composites has made it possible to have alternate material for glass fibre. Since, Glass fibre have some shortcomings such as relative high density and difficulty to machine, researchers and scientists have worked to develop a Bio-composite material which is to be formed by matrix of resin and reinforcement of Natural fibre or Bio-fibre (Material derived from plant). Advantages of using such material in automotive industry are their easy availability, cheap cost, being lightweight and durability. Apart from this, these are biodegradable and recyclable, which makes the easy for disposal as compared to other petroleum based products. Now a days, Automakers are also using Bio-composites for floor mats of car, compression moulded spare tire covers. Aim of present paper is to study the different process techniques used for processing the Bio-fibre and compare different Bio-fibre with respect to their properties.
Cutting Performance of Coated High Speed Steel Hobs in Dry Hobbing
Authors: Kubo Akio , Qiu Hua , Matsuoka Hironori
Published: December 2014

This paper presents the results of a systematic dry hobbing experiment performed on a general mechanical transmission type of hobbing machine. All four types of coated HSS hobs demonstrate satisfactory cutting performance applicable enough to practical production. Some related details such as the characteristics of hob wear, the effect of chip crush behavior and cutting speed are also discussed based on the experiment results.
Experiment Research of Coal’s Spontaneous Combustion Characters
Authors: Zheng Yan Min , Zhang Jin Feng
Published: December 2014

On the basis of physical oxygen uptake, use the instrument to identify the spontaneous combustion of Yang quan coal, and combination the insulation oxide of coal as well as the TG-DSC experiment to analysis of low-temperature oxidation of coal, though the DSC curves, combined with the insulation oxide experimental to analysis the size of the heat. In the end, we can come to the conclusion about the law and the different temperature parameters of the low-temperature oxidation. At the same time, the temperature when a large number of heat released by coals oxidation were also known ,and laid a theoretical foundation to develop prevention and control measures for the spontaneous combustion of coal mines.
Development of Mica-Based Glass-Ceramic with 4 Mol% of Fluorapatite
Authors: Jia Bai , Duangrudee Chaysuwan
Published: December 2014

SiO2, Al2O3, MgO, MgF2, SrCO3, CaCO3, CaF2 and P2O5 were used to prepare machinable glass-ceramic with 4 mol% of fluorapatite for restorative dental applications. XRD showed that the glass heat treated at 792°C (the first crystallization temperature+20°C) for 6 hours consisted of calcium-mica, fluorapatite, strontium apatite, anorthite, forsterite, fluorite and stishovite crystalline phases. The microstructures of the resultant glass-ceramic, observed by SEM, were found to exhibit plate-like mica crystals and many tabular particles embedded in the mica phases. The particles, determined by EDS, were rich in calcium. The three-point bending strength (158 MPa) closely matched that of nature tooth. Average Vickers hardness of the received glass-ceramic (2.6 GPa) was lower than that of natural tooth.
Optimization of Drilling Process Parameters for Minimizing Surface Roughness in Carbon-Carbon Composite Materials
Authors: Krishna Sastry K.V. , Seshagirirao V.
Published: December 2014

The Carbon-Carbon composites are nothing but the composites, in which Carbon Fibres are reinforced into a Carbon Matrix. The usage of Carbon-Carbon composite materials is gaining the significant position in the fabrication of Missiles, Space Shuttles and other advanced structures. These materials are primarily expensive in nature, and the drilling cost of these materials will increase the manufacturing cost of the final product. Hence care should be taken in drilling of these materials. The cutting process parameters should be chosen carefully to minimize the damage and improve the quality of the hole drilled. Surface roughness is the most serious problem in the drilling process of Carbon-Carbon composites. This paper discusses the comprehensive analysis of surface finish and the influence of various process parameters as spindle speed, feed rate and drill bit point angle on the surface finish of the drilled holes. These experiments were carried out on a CNC drilling machine at Anna university campus, Chennai, India. The drilling of Carbon-Carbon composite material has been done by using three different drill bit materials i.e. TiN coated carbide, Solid carbide and High Speed Steel tools with three different point angles. The Analysis of variance technique is used to study the significance of each process parameter on the performance characteristic surface roughness. A L27orthogonal array is employed to study the influence of process parameters. This paper also presents the comparison of the surface roughness values of drilled holes obtained by using the three different tool materials.
Road Traffic Light Control System Analysis and Design
Authors: Tian Xiao Wei
Published: December 2014

PLC as a kind of widely used industrial control equipment, is now increasingly used in traffic lights system, which can realize the automatic control of a traffic signal system, shortening the time of waiting vehicles, realize scientific management. In the design of this article, but also introducing EDA simulation crossroads traffic lights ablaze and vehicle traffic, very vividly shows the practical application of PLC in the traffic light system. This article is built on a typical intersection traffic research investigation, and PLC controller to realize intelligent control of road traffic signal lamp.
The New Methods of Deep Processing of Oil Residues in Conjunction with Shales
Authors: Kairbekov Zh.K. , Maloletnev A.S. , Yemelyanova V.S. , Myltykbaeva Zh.K. , Baizhomartov B.B.
Published: December 2014

The results of studies on the development of a new process of thermal cracking of tar oil as a slurry with crushed oil shale to obtain components of motor fuels. The results suggest doubtless advantages of the process before the industrial of thermo cracking, since the single-stage processing of raw materials in relatively in the mild conditions (5 MPa, 425 °C, volumetric feed rate 1.0 h-1) is achieved deep destruction of tar oil (the yield petrol fraction with a bp amounts to up to 180 °C – ~12 mass % of middle distillates with a bp 180-360 °C – 43-44 mass %, of raw material for catalytic cracking of a bp 360-520 °C – ~15-16 %, based on the initial tar oil). Formed like coke products and raw materials contained in V and Ni is postponed on the mineral part of slate and removed from the reaction zone with the liquid products of the process.
Design and Implementation of Simple Digital Oscilloscope Based on STM32
Authors: Zhao Yan , Wang Jiang Hua , Li Kun
Published: December 2014

The digital oscilloscope adopts STM32 MCU as the control core, uses the IDT7201 for memory, through the AD converter ADS830 real-time sampling achieve the extraction of the input signal and digital storage, display; Crossover functions are realized by CPLD to provide accurate clock for MCU, FIFO, ADS830, and communicate with MCU through SPI agreement. Software design to achieve control A/D converter start-up and storage of the sample data, calculate the frequency and amplitude, buttons and LCD screen.Using Altium Designer software to design and produce a digital oscilloscope printed circuit board PCB, and complete the whole production and commissioning. The digital oscilloscope can be real-time accurate sampling and show the general low frequency signal, can be used when using battery power, small volume, convenient to carry, it can be easily integrated into the experiment box, to become a part of it, and other function modules to form a whole.
Acousto-Optic Double Control Automatic Alarm and Lighting Circuit Design
Authors: Zhang Zhi Jun
Published: December 2014

In this paper, the design and construction of the acousto-optic double control automatic alarm and lighting circuit. Through analyzing the existing solutions, using an infrared tube, electret sensor as well as the main device, by 555 multivibrator principle of design and production. This system sound control circuit, control circuit and the infrared light control circuit, and the door alarm circuit, and has the function of alarm lighting using infrared good concealment, the alarm can be used in day and night, at the same time controlling light lamp has the effect of energy saving.
Problems and Optimization Recommendations Exist in Manufacturing Logistics Cost Accounting
Authors: Dai Yun Hui , Ge Xue Ning
Published: December 2014

logistics management system is a new thing in China, the logistics cost accounting method can be also used some be inopportune or inappropriate, and therefore have a very negative impact on the operation of enterprises. The current or on the accrual basis of accounting, and have set up a special accounting system to the operation mechanism of logistics, lead to the definition of logistics cost according to the comprehensive accounting. The following describes the logistics cost accounting method of manufacturing enterprises, discusses the reasons for the logistics cost accounting, research on some problems in current logistics cost accounting, and gives specific suggestions for improvement.
The Application of Logit Model in College Students’ Financial Investment Behavior
Authors: Wang Si Yao
Published: December 2014

Investment management is becoming increasingly popular among college students, college student has become a financial investment groups that cannot be ignored. This paper is divided into three parts, the first part focuses on the contemporary situation of college students' financial investment; the second part focuses on that based on the Logit model state the factors that affect College students' financial investment., the last part introduced that high institutions how to improve the students' financial investment capacity.
Based on the Fault Tree of Public Housing BOT Project Risk Assessment
Authors: Zhang Wei , Shang Yao Hua
Published: December 2014

Effect of BOT financing mode in the housing is more and more obvious in the diversifieddevelopment，how to evaluate the risk of this kind of mode is an issue. The article analysis the detailed of the various potential risks of BOT financing mode; the fault tree method into the risk assessment of public rental housing in the BOT project, to test the effectiveness of the final project risk evaluation.
Using TAM to Explore Vocational Students’ Willingness to Adopt a Web-Based BIM Cost Estimating System
Authors: Wu Yun Wu , Hsu I Ting , Lin Hsin Yi
Published: December 2014

In this study, the technology acceptance model (TAM) is used to analyze from a vocational school to usethe Web-based BIM cost analysis system developed in this study.
Chinese Enterprises in the Competition in the International Project Bidding Analysis
Authors: Li Yu Hui
Published: December 2014

The biddingat home and abroad was reviewed and compared with the bidding,pre-qualification, project environment differences, similarities anddifferences of contract conditions, etc.International project tender offersstrategy including binding decision-making strategy, in-depth hinterlandstrategy and combined strategy. Transnational project bidding quotation hasexpanded the unit price, opens the mouth to upgrade offer, more quotation, noprofit, joint offer insurance mark, and other skills. Through these analyses,put forward reasonable suggestions to our country in the international projectbidding work.
Knowledge System Development Based on the Primitives of Sheet Metal
Authors: Zhang Xiao Fen , Cao Yan , Bai Yu
Published: December 2014

Through the sheet metal digital information classification, induces the 2D graphics, 3D model, data forms, the information such as process design chart, file information is automatic extracted and meta data description information is interactively supplemented , data is stored in the database records, two kinds of query is designed for recorded data query and keywords retrieval methods.Engineering database system designed to define meta data, storage, retrieval, information coding and classification of four levels, combined with the engineering application of system requirements and function module design,interface of sheet metal unfolding system is developed.The system improve the design capability of sheet metal enterprises, reduce manufacturing cost, enhance the capacity of information management .