bluuebunny/crossref_metadata_2025 huggingface dataset:
A Study on the Interference Checking in CNC Incremental Forming Based on Parasolid
Authors: Zhu Hu , Jing Xue Yong , Lv Bo Chao , Ju Jin
Published: July 2014

The squeezing tool in 5-axis CNC incremental forming has more degrees of freedom and can squeeze the sheet metal along the reasonable direction, thus better forming effect is obtained. While in the process of 5-axis CNC incremental forming the interference between squeezing tool and workpiece occurs frequently because of the continual posture change of squeezing tool. Therefore the interference checking method of squeezing tool and workpiece is studied in this paper. The interference is checked out through the collision calculation of established squeezing tool solid models of different posture and workpiece solid model based on Parasolid modeling kernel. The case study shows that the method can check the interference between the squeezing tool and workpiece very well.
Development of Automatic Wafer Centering System for Vacuum Transfer Robot Using for Semiconductor Manufacturing
Authors: Chung Myung Jin , Lee Sung Jik
Published: July 2014

The automatic wafer centering system having the function as wafer slip is measured and arm is controlled to compensate the wafer position error by slip is proposed. Two dimensional positions to compensate the wafer slip from measured sensor signal are calculated by using the compensation algorithm. Automatic wafer centering system is developed and verification test is conducted. In the verification test, developed automatic wafer centering system has measurement accuracy of under 0.2mm for radial and tangential direction.
Electro-Hydraulic Servo Actuator Fuzzy Self-Tuning PID Control Research
Authors: Wang Xin Ge , Li Lei , Wei Xiu Ling , Chen Gui Qin , Liu Bing Feng
Published: July 2014

According to the different working state of electro-hydraulic servo actuator servo system, the design parameter self-tuning three-dimensional fuzzy controller, the automatic setting of 3 d quantization factor and scaling factor of the fuzzy controller, the fuzzy control system can enhance the ability to adapt and tracking performance, improve the quickness of electro-hydraulic servo actuator servo system, reduces the overshoot of the electro-hydraulic servo actuator servo system, and rapidity and control accuracy to meet the electro-hydraulic servo actuator servo system dynamic performance and static performance requirements.
Position Tracking Control of Flexible Robot Joints Using Model Predictive Control
Authors: Wei Nan Zhe , Sun Han Xu , Jia Qing Xuan , Ye Ping
Published: July 2014

In this paper, a model predictive controller for the position tracking of flexible robot joints with harmonic drive gears is presented. The control methodology enables the drive's safety and physical constraints on torque and speed variables while guaranteeing the stability of the system. The effect of the predictive horizon on the drive performance is examined. Moreover, the influence of parameter changes is tested in this paper. Experimental results demonstrate the proposed controller is very effective in tracking position references while meeting the demanding drive constraints requirements during operation.
Research and Motion Analysis of Multi-Object Compact Layout Based on CPR in 2D
Authors: Zheng Yu Jia , Long Feng Ying , Ma Jun Yan , Xia Wei , Chen Biao , Liao Xiao Ping
Published: July 2014

Compact layout is a problem widely faced in many branches of science, engineering, is also the key point in lightweight design of product. With the perspective of digital design we divided the layout procedure into three stages-only outers, outer-inner, more objects involved-based on (convex hull plus rubber band) CPR. Motion analysis in each stage is done respectively according to physics principles. Rules of Multi-Object collision response are built in two forms, vertex-edge and edge-edge. Objects motions are determined by their motion analysis and collision response rules. An example of Multi-Object compact layout in stimulation platform is given and feasibility of the method is confirmed.
A New Contour-Parallel Tool Path Planning Algorithm for 2D Pockets
Authors: Liu Miao , Yao Ying Xue , Zhou Liang
Published: July 2014

A tool path planning algorithm that generates contour-parallel tool paths for 2D pockets is proposed. 2D pockets with islands bounded by line and arc segments can be handled. The algorithm first generates raw offset loops by vertex offset, then based on the concepts of offset region and invalid edge, local invalid edges are removed. By the character of direction vectors at the intersections of offset tool paths, the invalid sup-loops are removed. The offset tool paths are linked by depth-first traversal algorithm after constructing a single-parent tree. Experimental results are given to verify the proposed algorithm.
Performance Analysis of the PISO-Based CFD Simulation
Authors: Ren Xiao Guang
Published: July 2014

Computational Fluid Dynamics (CFD) is widely applied for the simulation of fluid flows, and the performance of the simulation process is critical for the simulation efficiency. In this paper, we analyze the performance of CFD simulation application with profiling technology, which gets the portions of the main parts’ execution time. Through the experiment, we find that the PISO algorithm has a significant impact on the CFD simulation performance, which account for more than 90% of the total execution time. The matrix operations are also account for more than 60% of the total execution time, which provides opportunity for performance optimization.
Workshop Product Manufacturing Process Information Integration Based on USBOM
Authors: Xu Ai Ming , Gao Jian Min , Chen Kun , Chen Fu Min , Wang Zhao
Published: July 2014

Workshop is gathered place and exchange centre of product manufacturing process information (PMPI), which is divided by enterprise heterogeneous systems. This led to the integration and sharing difficulty of PMPI and constrains the information system application in workshop, like MES. To solve this problem an information integration method based on semantic BOM was proposed. Firstly, a global ontology model USBOM of PMPI was constructed which given the unified semantic description of PMPI. Based on USBOM a PMPI integration framework was proposed. Finally, a workshop product manufacturing monitoring system was used as an example to verify the feasibility of this approach.
Double Erasures Correcting MDS Code with Heterogeneous Placement
Authors: Luo Xun , Shen Huan
Published: July 2014

One array code scheme is proposed for double erasures correcting. The scheme made use of horizontal and oblique data placements to accommodate parity strips. The scheme can reduce the occurrences of bottlenecks in part due to the oblique placement. The encoding and decoding algorithms can be used in distributed storage. It has been proved that the code with the encoding scheme is MDS. It has also been indicated that the decoding scheme is effective for array code (p-1)×(p+1) when p is and only is a prime number. Moreover, two placements stripes are not associated with each other, which made it much easier for decoding to tolerate double erasures.
Based on the Analysis and Study of Computer-Aided Industrial Design (CAID) Technology
Authors: Hui Kang , Li Jing
Published: July 2014

With the development and advancement of technology, innovation and support the development of new product design is inseparable from the concept and methods of industrial design, industrial design not only has become an important means of market competition, but also become the country with the economy powerful weapon development. This paper discusses the development of industrial design disciplines to analyze the computer-aided industrial design (CAID) the basic meaning and value, and through man-machine engineering design and creative thinking intelligent technology applications in the study of CAID, will make the final interpretation of the industrial design CAID grand blueprint towards a more diversified and high-level areas continue forward.
Application of New Design Method by High-Strength Composite Material
Authors: Iida Haruhiko , Fujishima Toshiaki , Ohbuchi Yoshifumi , Sakamoto Hidetoshi
Published: July 2014

The purpose of this study is to apply a new design method, which integrates both optimum strength and product design. Here, the collaboration of design and strength by using composite materials is administered. Many products, which are made from high strength composite materials, require new product design technology. Existing product developments tend to separate product design from product planning. The process begins from planning the shape of the product, then calculating the strength, and lastly designing the product. In our new design method, we create from an engineering point of view. By using a design method of high-strength materials, we designed a new ZIGZAG CHAIR made of carbon fiber reinforced plastic of excellent strength and light-weight.
A New Sample Selection Method for Testability Verification Experiment
Authors: Liu Gang , Li Fang
Published: July 2014

To solve the difficulty of equipment testability verification experiment sample selection, a sample selection method of testability verification experiment was presented. The failure-test dependency matrix and its extended matrix, failure modes function equivalence set and failure modes test equivalence set were analyzed, on the basis, failure modes sample equivalence set was proposed. Meanwhile, importance characteristic was analyzed and maximum entropy was solved, and the sample selection method was presented, its process was obtained. Moreover, the method was comparatively analyzed with actual methods in the experiment. The results show that application the method in paper, can reduce sample number, save test expenses, and meet the test requirement of adequacy, so the method in paper is proved effective and feasible.
Synthesis and Fluorescence Properties of a New Eu(III) Complexes with β-Diketone Ligand
Authors: Lu Ya Nan , Zhao Xiong Yan , Wang Xin
Published: July 2014

A novel β-diketone 4-[4-(Dibenzylamino) phenyl]-2,4-dioxobutanoic (DPD) and its corresponding Eu3+ complex with 1,10-phenanthroline were synthesized. The structure, thermal behaviour and fluorescence property of the complex was characterized by Fourier Transform Infrared (FT-IR), thermal gravimetric analysis (TGA) and fluorescence spectrophotometer. The fluorescence characterization shown that the addition of β-diketone and 1,10-phenanthroline enhance the fluorescence intensity of the complex. Eu3+ complex was considered to be a valuable organic light-emitting material with bright red fluorescence because of its strong emission band. Furthermore, the thermal stability characterizarion shows that the obtained rare earth β-diketone complexes have good thermostability.
Research on Electrical Engineering with a Multi Energy-Type Coordinated Micro-Grid Day-Ahead Scheduling Strategy Based on IPSO Algorithm
Authors: Ma Cheng Jia , Lu Jian Xu
Published: July 2014

This paper establishes a micro-grid (MG) model containing a variety of distributed energies, battery, combined cooling, heating and power (CCHP) and so on, and puts forward a method using improved PSO (IPSO) algorithm for a multi energy-type coordinated MG day-ahead scheduling. One day is divided into two time periods, including time of peak period (TOP) and time of valley period (TOV). According to the scheduled time period and state of charge (SOC) of the storage units, different types of scheduling strategies are adopted. Based on the standard PSO algorithm, improved PSO algorithm proposed in this paper increases the parameter of particle volume and improves the inertia weight, which inhibits premature and does better in global searching. Through a few simulation experiments, it proves that this scheduling strategy has the following three advantages. Firstly, it enhances the reliability of MG. Secondly, it achieves the goal of load shifting in the main grid. At last, this strategy reduces the operation cost of a MG obviously.
Design and Implementation of Frequency Measuring Circuit Based on Countdown Counter
Authors: Xu Lian Xiang , Shi Xiong
Published: July 2014

After down-conversion and shaping, the transmission pulse signal of radar turns to intermediate frequency TTL square signal. This signal, on the basis of the frequency measuring principle of countdown counter, is counted by three pieces cascading of binary synchronous counter 74LS161. Three hundred pulses of the signal are chosen to form the counting section, in which the 100MHz standard square wave is counted by 74F161 with three pieces cascading. Then the result is loaded into MCU. The MCU works out current IF-RE and controls the DDS local frequency synthesizer to adjust the local output, in order that the frequency of IF signal is stabilized in the specified scope. The digital automatic frequency control system of radar is constituted.
Integrated circuit TTL has the longest history and highest production at home and abroad. Its inherent structural features, good electrical property, constant constitutional improvement and performance improvement help the “aged” TTL circuit maintain its popularity after several changes[1].
The integrated circuit TTL possesses high reliability, broad range of operating speed, low power dissipation and favorable antijamming capability. In this essay, with TTL integrated circuit and 51 MCU[2], the frequency measuring circuit based on countdown counter is realized, and with the assist of DDS frequency synthesizer the automatic frequency control system of radar[3] is constituted and has successfully been applied into some domestic warning radar.
Synthesis and Photochromism Studies of 1-(3,5-dimethyl-4-isoxazole)-2-[2-methyl-5-naphthyl-3-thienyl] perfluorocyclopentene
Authors: Dong Xiao Rong , Wang Ren Jie , Liu Gang , Pu Shou Zhi
Published: July 2014

A new class of unsymmetrical photochromic diarylethene bearing an isoxazole moiety was synthesized. Its photochemical properties, including photochromic behavior and kinetics, have been investigated systematically. The result indicated that the Diarylethene 1a changed the color from colorless to pink irradiation with 297 nm UV light, in which absorption maxima were observed at 522 nm in hexane. The photochromic reaction kinetics indicated that the cyclization processes of 1a belong to the zeroth order reaction and the cycloreversion process belong to the first order reaction.
Phase D-Value Digital Measuring Algorithms Study and Design in Power System
Authors: Su Wei Yi , Li Guang
Published: July 2014

The power factor is an important technical indicator of the power quality, this paper analyzed the principles, advantages, disadvantages and application ranges of the power factor and phase D-value calculation algorithm, phase D-value and voltage conversion algorithm and zero crossing point phase detector algorithm, designed the practical circuits especially, these design thoughts and practical circuits could be applied to the substation’s voltage and reactive power optimal control equipment, acquisition terminal of power load control system and other power devices, the measuring accuracy satisfied the design requirements.
Analysis of the Unexpected Opening of ABB Circuit-Breaker Opening under 30% Control Voltage
Authors: Yu Zhi Qiang , Wang Xing
Published: July 2014

The test data of circuit-breaker operating characteristics is important parameter to monitor the circuit-breaker. The unexpected opening of ABB HPL Series circuit-breaker under 30% control voltage in the recent operating characteristics in Shenzhen is analysed in this paper .The root cause of failure is identified. Two solutions are proposed: adjust the gap between coil and armature and replace the trip coil “open”, to eliminate such failures, ensure the safe and reliable operation of the circuit breaker.
Research on Photochromic Materials with Synthesis and Properties of a New Unsymmetrical Diarylethene 1-(2-cyano-1,5-dimethyl-4-pyrryl)-2-{2-methyl-[5-(4-methylene-bromine)phenyl]-3-thienyl} Perfluorocyclopentene
Authors: Duan Fang , Liu Gang
Published: July 2014

A new photochromic diarylethene having a pyrrole unit, which is named 1-(2-cyano-1,5-dimethyl-4-pyrryl)-2-{2-methyl-[5-(4-methylene-bromine) phenyl]-3-thienyl} perfluorocyclopentene, was designed and constructed successfully. And its properties have been discussed systematically, including photochromic, fluorescence switch and kinetics experiments in acetonitrile solution. The results showed that its photochromic behaviors could be modulated by UV/Vis light, changing from colorless to blue in acetonitrile solution. What is more, the kinetic experiments illustrated that the cyclization/cycloreversion process of this compound was determined to be the zeroth/first reaction.
A Research on an Effective Method for Embedded Software Testing
Authors: Bi Jing Cun , Li Qi , Dou Wen Hui , Xu Jian Feng
Published: July 2014

This paper discusses and compares the current development of the methods and techniques of embedded software testing. A compromised and practical embedded software testing method, which is between intervention and non-intervention, is proposed and the flow process is provided as well. The method has been verified by a real-case experiment and the result is satisfactory.
Key words: Embedded software; testing method
Research on Photochromic Compounds with Synthesis and Properties of a Novel Unsymmetrical Diarylethene with a Benzothiophene and a Pyrrole Group
Authors: Jia Hong Jing , Fu Ying Long , Fan Cong Bin
Published: July 2014

A new unsymmetrical photochromic diarylethene 1o, which is named [1-(2-methyl-benzothiophene)-2-(2-cyano-1,5-dimethyl-4-pyrryl)]perfluorocyclopentene, was synthesized. We used it to accomplish recording by optical storage technology as memory medium. Then its photochromic both in hexane solution and in PMMA film and kinetics experiment were investigated in detail. The result indicated that this diarylethene had good thermal stability and exhibited reversible photochromism, changing the color from colorless to violet in hexane solution upon appropriate irradiation with 297 nm UV light, respectively. What is more, the kinetic experiments illustrated that the cyclization/cycloreversion process of this compound was determined to be the zeroth/first reaction. The results demonstrated that the unsymmetrical diarylethene compound 1o, which we have synthesized, had attractive properties for potential application in optical storage.
Data Processing with an Innovation Self-Adaptive Denoising Amalgamation Algorithm
Authors: Hu Jian Yu , Hou Shu Ming , Liu Yan Fei
Published: July 2014

The process noise and observation noise of a system are easily disturbed. It’s hard to know its statistic character. This paper proposes an innovation self-adaptive fading UPF algorithm to solve this problem. In the new algorithm, self-adaptive gradually vanishing UKF is used as weightiness density function of particle filter. New observation data is used to modify the error caused by state function of system and noise statistic parameter in time. What’s more, the new algorithm avoids traditional particle filter’s defect that it always gets part optimal solutions. Experiment results indicate that this new algorithm has a higher accuracy and robustness for the changeable noise statistics and non-linear system.
Analysis of Environmental Materials with Correlation between PM2.5 and Other Indexes in AQI of Wuhan
Authors: Xie Ying Hong , Han Xiao Wei , Sun Peng , Zhang Xue Lian
Published: July 2014

Fine particulate matter PM2.5 is the main factor of "Haze” weather. The paper chose the content of various indicators in the sets of air quality index AQI detected by a monitoring station in Wuhan city as samples. Based on the methods of Spearman's rank correlation coefficient and Kendall rank correlation coefficient to establish mathematical model, the paper analyzed the correlation between the content of PM2.5 and other five basic detection indicators and corresponding pollutants, with providing theoretical and experimental evidence for air management work. Two methods of the experiment results showed that PM2.5 (content) has a strong correlation with sulfur dioxide, nitrogen dioxide, particulate matter, carbon monoxide (content), and had a negative correlation with ozone (content).
Research on Photochromic Compounds with Synthesis and Photochromism of 1-(2-methyl-3-benzofuryl)-2-{2-methyl-5-[4-formyloxyethyl (Rhodamine-B)] phenyl-3-thienyl} Perfluoroyclopentene
Authors: Xue Dan Dan , Liao Guan Ming , Zheng Chun Hong , Pu Shou Zhi
Published: July 2014

A new photochromic diarylethene compound bearing a rhodamine B unit, 1-(2-methyl-3-benzofuryl)-2-{2-methyl-5-[4-formyloxyethyl (rhodamine-B)] phenyl-3-thienyl} perfluorocyclopentene (1o) was synthesized, and its photochromic properties such as photochromism in solution as well as in a polymethylmethacrylate (PMMA) amorphous film were investigated specfically. 1o exhibits good photochromism upon alternating irradiation with UV light and visible light (> 510 nm) in hexane and a PMMA film. The kinetic experiments showed that the cyclization and cycloreversion processes were zeroth and first order reaction, respectively.
Efficient Synthesis, Photochromism and Fluorescence Properties of a Novel Diarylethene Bearing a Naphthalene
Authors: Xu Hong Yan , Ma Le Le , Pu Shou Zhi
Published: July 2014

A new unsymmetrical photochromic diarylethene compound 1a was synthesized and its photochromism were investigated. The compound exhibited good photochromism in solution and PMMA films with alternating irradiation by UV/Vis light, and the maxima absorption of its closed-ring isomer (1b) are 536 nm in hexane and 552 nm in PMMA films. The open-ring isomer of the diarylethene 1a exhibited relatively strong fluorescence at 441 nm when excited at 290 nm. Its fluorescence intensity decreased along with the photochromism from open-ring isomers to closed-ring isomers upon irradiation with 297 nm UV light.
Simulation and Test for the Lightning Damage of the Glass Fiber Composites
Authors: Chen Xiao Ning , Zhao Jin Long , Zhang Yun Sheng , Zhang Bin
Published: July 2014

Theoretical deducing, simulated lightning test and finite element simulation are used to research the mechanism and state of lightning damage of the aircraft composites sandwich panels. It provides the basis for the design of the aircraft lightning protection. The three-dimensional finite element model of the composites panel is constructed through the thermal electrical-mechanical multi-Physics coupling field. According to the structure and the role process, the lightning effect of the aircraft composites is analysed to study the damage mechanism and the possible state of the composites panel that is struck by lightning. The impact current generator is used to carry out the simulated lightning test to observe the lightning effect of the composites panel. By comparing the results of the test and the simulation, the effectiveness and the correctness of the simulation are verified.
Application of TDR Method for Moisture Profiles Measurement in Cellular Concrete
Authors: Fiala Lukáš , Pavlíková Milena , Pavlík Zbyšek
Published: July 2014

Possible applicability of TDR method for continuous monitoring of moisture content in porous building materials is studied in the paper. TDR method, originally proposed for application in soil science, represents prospective tool for long time monitoring of moisture content in laboratory as well as in-situ conditions neglecting the effect of salts presence in researched material on accuracy of measured moisture content. The basic experimental setup of the TDR method is adjusted to the measurement of water content in building materials. The practical application of the method is presented on the measurement of moisture profiles in rod-shaped sample of cellular concrete.
Influence of High-Temperature on Polycarboxylate Superplasticizer in Aluminous Cement Based Fibre Composites
Authors: Jogl Marcel , Reiterman Pavel , Holčapek Ondřej , Koťátková Jaroslava
Published: July 2014

This paper summarizes the results of an experimental program aimed at investigating of the mechanical properties of composites based on aluminous cement for high-temperature applications and deal with the influence of high-thermal loading on polycarboxylate superplasticizing (PCSP) additive contained in the composite. The intent of this examination was caused by the suspicion that the action of high-temperatures can lead to burnout of the PCSP additive and thus subsequently affecting the mechanical properties of the final composite. Silica composites based on Portland cement and silica aggregates are not able to resist the effects of high-temperatures [1]. For high-temperature composites was therefore used aluminous cement Secar®71 (Lafarge S.A.) in combination with crushed basalt aggregates of fraction 0/4 and 2/5 mm. The flexural strength was greatly improved thanks combinations of basalt fibers with lengths of 6.35 mm and 12.7 mm. The values ​​of flexural strength and compression strength were investigated on samples dried at temperature 105 °C or loaded for 180 minutes with high-temperature of 600 °C or 1 000 °C.
Development and Mix Design of HPC and UHPFRC
Authors: Reiterman Pavel , Jogl Marcel , Baumelt Vit , Seifrt Jaroslav
Published: July 2014

Application of HPC (High performance concrete) is very popular and modern solution in current architecture. Higher mechanical and durability properties allow using of thin-walled cross-sections bringing savings of materials and internal space of buildings. This paper deals with development of HPC and UHPFRC (Ultra high performance fiber reinforced concrete) mix design and impact of composition to final mechanical properties. Mix design is focused first on the influence of various additives such as fly ash, silica fume and quartz flour and then to different dosage of steel fibers.
Differences in the Properties of Arenaceous Marlstones from Different Quarries
Authors: Vejmelková Eva , Čáchová Monika , Koňáková Dana , Keppert Martin , Reiterman Pavel , Černý Robert
Published: July 2014

In this article two arenaceous marlstones quarried in Czech Republic were compared. Thanks to its easy workability and many deposits, arenaceous marlstone belonged to the main building materials in Roman and Gothic style. In the Czech Republic many interesting historical buildings from this period still exist, and they need to be sometimes repaired. It is important to use similar material for conservation of historical values of these monuments. From the geological point of view arenaceous marlstone is sedimentary rock containing loamy and silty particles. But as it was proved in this study two functioning quarries in the Czech Republic supply two materials with extremely different properties. Open porosity varies by about 33%, compressive strength by about 65% and also thermal and hygric properties are almost incomparable.
Moisture Transport Properties of Hydrophilic Mineral Wool
Authors: Pokorný Jaroslav , Pavlíková Milena , Žumár Jaromír , Pavlík Zbyšek , Černý Robert
Published: July 2014

Mineral wool materials are widely used for thermal insulation of buildings due to their low thermal conductivity and high fire resistivity. On this account, they are popular materials for passive fire protection of buildings. Thermal insulation boards are usually provided with hydrophobic admixtures that ensure their functional properties even in the contact with moisture. In this paper we focused on investigation of hygric transport properties of hydrophilic mineral wool materials that could find application in interior thermal insulation systems as well as in desalination and drying of salt laden materials and building structures. The obtained results give evidence of the effect of fiber orientation on studied material properties and reveal that fiber orientation perpendicular to board surface is a perspective way of materials development.
Moisture Migration in High Strength Concrete
Authors: Benáková Martina , Kulovaná Tereza , Jerman Miloš
Published: July 2014

Moisture transport in high strength concrete is investigated in this paper. The experiment that involves the water suction is carried out in a long-term. The moisture profiles are measured by non-destructive capacitance method, the last profile is determined gravimetrically. The suction experiment is carried out in isothermal condition at the temperature of 22±1 °C and 25-30% relative humidity.
Mechanical Behavior of the Cement Mortar with High Amount of Municipal Solid Waste Incineration (MSWI) Bottom Ash as an Alternative Aggregate
Authors: Polozhiy Kirill , Keppert Martin , Jogl Marcel , Černý Robert
Published: July 2014

The aim of this study was to find out an application of the municipal waste incineration materials and try to use them as a replacement for the natural ones. MSWI (Municipal Solid Waste Incineration) bottom ash (BA) was used as partial/total replacement of siliceous sand in CEM II based mortar. Three size fractions of BA were used with respect to replace the siliceous sand in corresponding way. There were designed 5 mixtures with increasing replacement of siliceous sand by 25 % each. The water/cement ratio was decided to be taken according to the constant consistence of the mortar. The bulk density, compressive strength and bending strength of the mortars were decreasing with growing content of BA.
Numerical Study of the Influence of Internal Blast on the Earth Covered Composite Arch
Authors: Fornůsek Jindrich , Zatloukal Jan
Published: July 2014

This paper presents a numerical study of earth covered composite arch subjected to internal blast load equaled to 6,25 tons of TNT. The concrete arch was protected against the blast by the 4 or 7 mm corrugated sheet. There was also one simulation where no sheet was applied. It was found that the presence of the corrugated sheet anchored to the arch can reduce 40 % of arch damage compared to the unprotected arch.
Effect of High-Temperature Alloy Cutting Speed on Tool Wear
Authors: Wang Yu , Wang Yi Wen , Zhao Zhong Yang , Cai Ye
Published: July 2014

High-temperature alloy is an important material in making critical aerospace engine parts, it is also used in weapons industry, energy, chemical, power, etc. In this article, DEFORM-3D software applications to establish a three-dimensional cutting model of high-temperature alloy GH4169. Combined with cutting experiment analysis the characteristics of the tool wear and cutting temperature by change cutting speeds, and optimized cutting parameters combined with experimental on tool wear.
Experimental Study on Surface Quality at Different Milling Speed of High Volume Fraction SiCp/Al Thin Walled Test-Piece
Authors: Jiao Ke Ru , Huang Shu Tao , Xu Li Fu
Published: July 2014

In order to investigate the influence of milling velocity on surface roughness of the cutting entrance, middle part and cutting exit, high milling experiment for the thin walled test-piece of high volume fraction SiCp/Al composites was preformed with PCD tool. The results indicate that when milling at lower speed 60m/min, the SiCp/Al test-piece is apt to vibrate. As well as, the surface roughness machined test-piece in cutting exit increases obviously and its Ra value reaches 1.721μm, which leads to the inferior surface quality. In conclusion, the surface roughness, either at cutting entrance, middle or at cutting exit, all is a decline trend with the milling speed increasing. Moreover, Ra value of the cutting entrance is the biggest, followed by the middle, and the cutting exit is the smallest.
Cutting Force Analysis in Tool Condition Monitoring of Difficult to Cut Materials
Authors: Liao Zhi Rong , Gao Dong , Lu Yong
Published: July 2014

Tool wear condition monitoring has been an effective method in improving the production efficiency and process automation. In this paper, to analysis the cutting force features in tool wear condition monitoring of difficult to cut materials, we first remove the direct current components and apply a fast Fourier transformation to the cutting force to observe the features in different frequency bands. A wavelet packet transformation is then adopted to the cutting force to observe the relationship of energy ratio and tool wear states.
Research on Fractal Characterization in Grinding of Monocrystal Sapphire
Authors: Wang Qiu Yan , Zhao Wen Xiang , Liang Zhi Qiang , Wang Xi Bin , Jiao Li , Wu Yong Bo
Published: July 2014

Monocrystal sapphire ground surfaces obtained by ductile mode and brittle mode are analyzed in this paper. A two dimension (2D) fractal properties of different ground surfaces are calculated and analyzed by a box-counting fractal method. The results show that the fractal dimension (FD) in parallel grinding direction can imply the material removal mode, especially for the surfaces with a similar roughness Ra obtained in different material removal modes. The ground surface obtained in ductile mode has much higher FD in the parallel direction than that in brittle mode. For the surface with high FD in parallel direction, its profile is more exquisite and surface quality is better. For the surface with a small FD in the parallel direction, a deeper crack and more pronounced defects occur. On the other hand, the profile FD distributions can reflect the anisotropic features of monocrystal sapphire ground surfaces. Therefore, the fractal analysis method has the potential to reveal precisely and comprehensively the ground surface characteristics of monocrystal sapphire.
Study Chip Breaking Experimental and Optimal Design of Tool for Machining Cylindrical Shell Material
Authors: Wu Ming Yang , Wang Bo , Cheng Yao Nan , Tian Y. , Gao Yong Bin , Yan F.G.
Published: July 2014

Large cylindrical shells are widely used in many areas of aerospace, petroleum chemical industry and nuclear power, etc. The main material of large cylindrical shells is 2.25Cr-1Mo-0.25V. In the process of heavy-duty cutting cylindrical shell material, the removal rate is high, and machine condition is rough, because the viscosity of big cylindrical shell material, the large chips not easy to be broken, and the tool and workpiece often entangled affect the machining efficiency. Researh and development to apply heavy cutting under the condition of high performance cutting tool has great practical significance, because of at the same time for heavy cutting tool is less in china. This paper uses the cutting performance experiment aiming to cylindrical shell material used in different three-dimensional groove blades and studies the range of different blades broken chips and the influence of three-dimensional groove on breaking effect. The chips form of cutting cylindrical shell material is summarized. And chip-breaking groove of the best performance is optimized. The paper designs of the new heavy-duty vehicles blade well and vertfies the good effect of the new heavy-duty cutting the breaker by the results of 3 d finite element simulation. The paper provides basis for designing heavy-duty cutting.
Cutting Performance and Wear Mechanism of Coated Silicon Nitride Cutting Tool in Turning of High Hardness Alloy Steel
Authors: Wang Jia Hua , Long Ying , Wu Shang Hua , Qin Jie , Zeng Jun Jie
Published: July 2014

Silicon nitride cutting tool, which is widely applied to machine cast irons, is not suitable for steel cutting because of the massive chemical wear between silicon nitride and ferrous materials. Covering protective coating (s) on tool surface is an effective way to isolate the chemical contact between cutting tool and workpiece. The aim of this paper is to investigate the cutting performance and cutting mechanism of coated silicon nitride cutting tools on steel machining. The cutting performances of uncoated and CVD-Al2O3/TiN coated silicon nitride cutting tool when cutting high hardness alloy steel AISI 4340 under dry condition were investigated. Studies include tool flank wear, tribological behavior of the tool-chip interface and wear mechanisms for both uncoated and coated silicon nitride cutting tools. The results showed that the tool life of silicon nitride cutting tools can be improved to a great extent with the cover of CVD-Al2O3/TiN coating by avoiding crater failure and reducing friction during steel cutting.
Finite Element Simulation Research on a Large Cutting Depth and Quasi-High Speeds 3-D Milling of Titanium Alloys
Authors: Huang Shu Tao , Chen Wan Yong , Zhou Li
Published: July 2014

In this paper, based on finite element software DEFORM, the model of a large cutting depth and quasi-high speeds milling of titanium alloys is built to study the cutting temperature and cutting force variation along with the change of cutting parameters. The simulation results show that: the location of the maximum cutting temperature appears in the cutting edges of the tool nose circular profile. Meanwhile, due to workpiece material rebound in the cutting process, the interface between workpiece and tool flank face occurs serious extrusion, which results in relatively high cutting temperature on the workpiece machined surface. In addition, cutting speed and feed rate per tooth play a key role in influencing the cutting temperature. However, the influence of cutting depth on the cutting temperature is less clear. With the increase in the feed rate and depth of cut, cutting force increased significantly. In particular, within the scope of the cutting speeds under the given conditions, the cutting force has a tendency to decrease with the cutting speed increasing over 120m/min.
Finite Element Analysis of Tree Groove Broaching Rebound
Authors: Wang Yu , Wang Bao Tao , Wu Xue Feng , Luo Wen
Published: July 2014

Fir tree groove broaching rebound has an obvious impact on the wheel groove manufacturing accuracy. The prediction of wheel groove rebound in the broaching process is an important aspect to improve the manufacturing precision of wheel groove. The deformation caused by cutting force is the main factor that decides wheel groove broaching deformation. For the problem of tree wheel groove broaching deformation and rebound: Firstly, calculating the actual cutting force through experiment and empirical formula of cutting unit cutting force, and then loading the cutting force as the initial load in the wheel groove line; Secondly, using the finite element software-Abaqus to copy the analysis of the wheel groove in the broaching process; Finally, comparing the rebound deformation curve and the data generated by the simulation with the actual ones measured by the worked wheel groove, and the result of simulation is consistent with the rebound. The prediction of wheel groove broaching rebound provides the basic theory to improve the wheel groove broaching of rebound problem.
Study on Finite Element Simulation of the Influence of Cutting Speed on Chip Formation of SiCpAl Composites in High Speed Milling
Authors: Liu Chuang , Huang Shu Tao , Jiao Ke Ru , Xu Li Fu
Published: July 2014

Application prospect of the high volume fraction SiCp/Al composites becomes increasingly widespread, the study of cutting mechanism is important for achieving its high efficient and precision machining. In this paper, a three-dimensional beveled simulation model of high volume fraction SiCp/Al composites on high-speed milling is established by finite element software ABAQUS, the constitutive on model material, the tool-chip contact and the chip separation model is elected reasonably.The paper analyzes the effect of cutting speed on the chip formation and the stress distribution of the material. The results shows that: with the increasing of cutting speed, the chip is easily broken, cutting speed have little impact on the maximum stress of the material.
Research on Mold Steel Minimum Cutting Thickness Based on ABAQUS
Authors: Ma Jing , Liu Xian Li , Yue Cai Xu , Song Sheng Gang , Feng Hui Ze
Published: July 2014

Take commonly used materials Cr12MoV for automobile panel mold as object of study, using the finite element simulation software ABAQUS, take the node displacement direction as the criterion of the chip formation, determine the minimum cutting thickness of Cr12MoV materials under different tool edge radius values, this value is determined to selection and optimization of mold steel milling finishing machining allowance provides a theoretical basis.
Analysis of Microscopic Damage of Hardened Steel Milling Surface on Mould Service Process
Authors: Zhang Wei , Xu Jin Hui , Zheng Min Li , Liu Hong Li , Wu Tong
Published: July 2014

The service performance is seriously effected by milling machined surface integrity of auto hardened steel mould. Basing on the microscopic damage evolution theory and hardened steel mould material micro-voids cell model, according to the service process load condition of hardened steel milling machined surface, surface microscopic damage evolution analysis had been conducted, surface evolution characteristics was obtained under different shapes void cell. Through comparative analysis the change law of damage evolution internal variable under different shapes void cell can know: respect to the ideal spherical, when the change of void volume fraction and the degree of matrix material yield were considered, the oblate hole more faster and the prolate hole more slower, which provide a further prediction for surface damage.
Modeling and Simulation of Ball End Milling Force for Mold Cavity Corner
Authors: Ding Yun Peng , Liu Xian Li , Shi Hui Nan , Li Jiao , Zhang Rui
Published: July 2014

In this paper, a cutting force model in ball end milling of mold cavity corner is established. Based on infinitesimal milling force model, cutting element of ball end milling cutter is treated as equal diameter end milling cutter, then determine the location of points when the micro-element participated in the cutting, and the tool-workpiece contact area and cutting range is determined. Thereby a complete milling force model in corner machining with ball end milling cutter is established.
Three-Dimensional Finite Element Analysis in Plunge Milling for Stainless Steel
Authors: Zhai Yuan Sheng , Wang Yu , Yan Fu Gang , Wang Bo
Published: July 2014

The three-dimensional finite element modeling and experimental validation of plunge milling of stainless steel (1Cr13) are presented. The commercial software Deform 3D applied for the finite element modeling is studied the effect of feed rate per tooth (fz) on the cutting forces and the temperature fields. The formation of chip in the finite element model is formed by local adaptive remeshing technique. The feed rate per tooth (fz) significantly affects the cutting forces, but slightly influences the maximum temperature of the chip.
High-Speed Cutting Finite Element Model Parametric Modeling Based on ABAQUS
Authors: Yue Cai Xu , Zhong Zhao Nan , Yu Ming Ming , Liu Xian Li , Feng Hui Ze , Yan Fu Gang
Published: July 2014

In traditional model of high-speed cutting, each modeling or modify process, material parameters input, boundary conditions set take up a lot of time, the solution process has blindness and not easy to operate. this article uses the python language, based on ABAQUS to secondary development of cutting simulation model in pre-treatment, establish exclusive two-dimensional cutting simulation interface, realization the parametric settings of tool angle, the size of the tool and the workpiece, cutting parameters, parametric design can shorten the time of modeling, and lay the foundation for the establishment of the high efficiency and high accuracy of the simulation model.
The Development of an Automatic Leather Nesting System
Authors: Zhou Liang , Hou Feng , Zhu Chuan Rui , Li Liang
Published: July 2014

To solve the problem of irregular leather nesting, a “Revolution-Rotation” algorithm is put forward on the base of heurism search in this paper. The system can be applied in nesting problem in both regular and irregular motherboard, and can achieve the balance of material utilization and nesting efficiency.
Application of Tool Compensation in CNC Machining
Authors: Zhang Lian Jun , He Chun Li , Chen Guang Jun
Published: July 2014

Tool compensation determines the machining precision and quality . There are tool length compensation,tool radius compensation and corner radius compensation in CNC system .The parameters of these compensation are all static.The purpose of this study was that the machining precision and quality were improved by changing the parameters of tool compensation,based upon changing the static parameters into the dynamic parameters of tool compensation.The three tool compensations were introduced and discussed about these being used in machining process and the function in processing.The concept of dynamic tool compensation was proposed in this paper. The method was used that the dynamic parameter substituted the static parameter in the processing by calculating . The process machining crafts information was included in tool compensation in every process step. The computer program was finished about how to calculate the dynamic parameter. The results indicate that high-precision machining is within the range of the maximum probability and the large machining error is within the range of the minimum probability by useing this method. Further more, the end qualified product is more than before.Process indicators and tool compensation merged is a breakthrough research by probability calculating for impoving the machining precision.We confirmed that the proposed method could be l used widely.
Tool Wear Identification in Turning Titanium Alloy Based on SVM
Authors: Liao Zhi Rong , Li Sheng Ming , Lu Yong , Gao Dong
Published: July 2014

Titanium alloy is difficult cutting materials,the samples of toolwear features are hard to acquire because of short tool life. In terms of the characteristic, Support Vector Machine (SVM) is proposed in this paper to monitor tool condition, the energy ratio of six different frequency bands of acoustic emission (AE) signal are extracted as cutting tool state features , SVM is trained and tested using these features ,Good classification results were achieved by using test set.
An Investigation of Wear of Ball End Milling Cutter for High-Speed Milling of Hardened Cr12MoV Steel
Authors: Yue Cai Xu , Feng Hui Ze , Ma Jing , Zhong Zhao Nan , Liu Fei
Published: July 2014

The high-speed milling experiments on hardened Cr12MoV steel were carried out with ball end milling cutter of different edge parameters. The influences of helix angle and rake angle on tool life and surface roughness were focused on. Meanwhile, the impacts of edge parameters on cutting edge stiffness and flank wear were analyzed on the condition of high-speed milling. It carried out that smaller helix angle and negative rake angle selected during high speed milling can guarantee quality of surface manufactured as well as longer tool life.
Parametric Design of Ball-End Milling Tools for High Speed Milling
Authors: Yue Cai Xu , Yan Fu Gang , Li Lu Bin , You Hai Yan , Yu Qing Jie
Published: July 2014

Ball-end milling cutter is widely used in machining complex surface parts , and it is need to select a reasonable geometric parameters of the milling cutter for different work piece materials and shapes and cutting parameters. This article is based on UG secondary development technology to develop the Multi-blade ball-end milling cutter parametric design system, it is automatic, fast and efficient to build all kinds of parameters of double, three and four blades ball-end milling cutter model required for user.