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Simulation of Gas-solid Two-phase Flow to Process of Filling the Foam mould

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Simulation of Gas-solid Two-phase Flow to Process of Filling...

第五届国际材料与热加工物理模拟及数值模拟学术会议

作者： Junxia JIANG1 a Zhichao WU2.b Liliang CHEN3.c state key {2. of material processing and die & mould technology huazhong University of science and technology wuhan {12.

In lost foam casting（LFC）,the foam pattern is the key qualification, and the filling process is one of the crucial processes to ensure the high quality of the foam pattern. Filling without uniformity and denseness will cause various defects and affect the quality of the surface. The influential factors of filling process are analyzed .And optimizing filling process, enhancing efficiency, decreasing waster are obtained by the numerical simulation of filling process using computer. The governing equations of the dense compressible gas-solid two-phase flow are established, and the physical signification of each one in the equations is discussed. The filling process is solved by Euler- Euler model. In the simulation, the volume of foam bead in every governing unit at different time is calculated, and the trend of foam bead flow is obtained. The filling process of various different conditions is simulated, considering different shooting methods and the position of baffles, and recorded by digital vidicon. The characteristics and the rules of the process are summarized. By contrasting the result of the numerical simulation with the one of examination, it is found that the fluid trend of foam bead in the numerical simulation is accordant to the actual process. So the numerical simulation of filling process by applying this model is an effective method.

关键词： lost foam casting foam pattern gas-solid two-phase flow filling process numerical simulation

huazhong University of science and {2.

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china Foundry 2019年第1期16卷 80-81页

作者： state key {2. of {3.s processing and die&mould technology state key {2. of {3.s processing and die & mould technology

Since 1952.huazhong University of science and {2.(HUST)was founded,or even further back,the German doctor Erich Paulun founded Tongji Medical University(TMU)in Shanghai in *** 2.00,the former HUST and the forme... 详细信息

关键词： huazhong University of science and technology

A prototype system for high precision 3. measurement based on grating method

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A prototype system for high precision 3D measurement based o...

2.07亚洲光电子会议光学设计与测试分会场

作者： Zhongwei Li * Yusheng Shi Congjun Wang Gang Zhou Dahui Qin state key {2. of {3. processing and die & mould technology huazhong University of science and technology 43.074 {12. {13.

In this paper a 3. shape measurement system based on the grating method was developed. The system consists of two CCD cameras and a DLP projector. The multi-frequency heterodyne principle was presented to overcome the unwrapping problem of phase functions, and a phase-to-coordinates conversion algorithm was proposed to reconstruct the 3. geometry from the unwrapped phase map. To demonstrate the performance of this 3. measurement system, a face model was measured, and the reconstructed 3. geometric surface is very smooth with details. Additionally, a ladder with one step was measured. The result shows the system can measure the discontinuous object and get high measurement precision.

关键词： 3. shape measurement phase shifting multi-frequency heterodyne principle Phase-to-coordinates conversion camera calibration

Part Orientation Optimization in Three Dimensional Printing

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Computer Aided Drafting,Design and Manufacturing 2008年第1期18卷 19-25页

作者： LIU Hou-cai1,2., MO Jian-hua1 , LIU Hai-tao1 (1. state key {2. of material Processes and die & mould technology, huazhong University of science and technology, wuhan 43.074, china 2. College of Electromechanical Engineering, Hunan University of science and technology, Xiangtan 4112.1, china)

Part orientation is one of the important factors in manufacturing with three dimensional printing (3.P) of rapid prototyping system. The minimum building time, being achieved by the part’s minimum building height and minimum width in 3.P’s y direction, is set as the objective of optimizing the part orientation. Genetic algorithm is adopted to find the minimum building height of parts and then ergodic searching is used to get the minimum width of part in y direction. A corresponding program for optimizing part orientation in 3.P was developed. Tests show the proposed approach is effective and fast.

关键词： rapid prototyping three dimensional printing part orientation optimization genetic algorithm

A Novel method for Human Expression Rapid Reconstruction

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A Novel method for Human Expression Rapid Reconstruction

第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： Gang Zhou,Zhongwei Li,Kui Huang,Congjun Wang,Yusheng Shi state key {2. of {3. processing and die & mould technology,huazhong University of science and technology,wuhan,{12.,{13..

Human expression rapid reconstruction has huge potential applications in entertainment and social *** this work,a rapid human expression measurement system based on a digital fringe projection and phase-shifting technique is *** measurement system consists of a digital light processing(DLP)projector and a high-speed CCD *** DLP projector is used to project computer-generated fringe patterns onto the human face,and the high-speed CCD camera synchronized with the projector to acquire the fringe images at a frame rate of 3. frames/*** on a three-step phase-shifting method and an accurate phase-height mapping algorithm,each frame of the 3.D human expression can be *** principle of the proposed method is described and some experimental results are presented to demonstrate its *** experiment results show that the measurement system can reconstruct accurate 3. human expression at a frame rate of 10 frames per *** obvious merit of this method is that it can reconstruct the 3. human expression in a very short time and it’s not sensitive to the movement of the face during the measurement processing.

关键词： Human expression reconstruction Digital fringe projection Phase shift

A one-point quadrature element used in Simulation of Cold Ring Rolling Process

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A one-point quadrature element used in Simulation of Cold Ri...

第六届材料与热加工物理模拟及数值模拟国际会议

作者： Xuebin Zhang 1,a,Qiong Wan 1,b,Yanmin Zhang 1,c,Zhigang Li 2.d 1 School of material science and Engineering,Henan University of science and technology,Luoyang 471003.china 2.state key laboratory of materials processing and die & {13. technology,huazhong University of science and technology,wuhan 43.074,china

A single-point load will be applied on the ring in the cold ring rolling process when the ring vibrates *** arouses hourglass in finite element simulation of the process using reduced integration element.A one-point quadrature element with hourglass control developed by Hu is used,and the user-defined control parameters are not *** energy can be reduced to 3.percent of the internal *** element is applied to simulation of a pure radial cold ring rolling with rectangular *** with the experimental results,the simulation results are proved to be accurate.

关键词： one-point quadrature Hourglass control finite element cold ring rolling

稀土Y对Al-10Mg合金显微组织和性能的影响

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特种铸造及有色合金 2009年第4期29卷 374-377页

作者：张磊董选普符聪樊自田华中科技大学材料成形与模具技术国家重点实验室

研究了添加少量稀土Y及固溶处理对Al-10Mg合金显微组织、力学性能和耐蚀性能的影响。结果表明,Y的加入能细化铸态合金的晶粒,形成Al4MgY相,沿晶界不连续分布,起到很好的晶界强化作用,从而提高合金的抗拉强度和伸长率。当Y的含量为0.4%... 详细信息

研究了添加少量稀土Y及固溶处理对Al-10Mg合金显微组织、力学性能和耐蚀性能的影响。结果表明,Y的加入能细化铸态合金的晶粒,形成Al4MgY相,沿晶界不连续分布,起到很好的晶界强化作用,从而提高合金的抗拉强度和伸长率。当Y的含量为0.4%时合金具有最佳的综合力学性能,抗拉强度达到2.1.8MPa,伸长率为4.3.。当Y含量超过0.4%时,Al4MgY相开始沿晶界连续分布,降低了晶界的结合强度,合金的强度和韧性下降。不含Y的合金拉伸测试时,出现典型的枝晶间脆性断裂,加Y后断裂机制转变为韧性断裂,因此合金韧性大大提高。固溶处理后合金的耐蚀性能好于铸态的,随着Y含量的增加,合金的腐蚀倾向变大,Y对合金的耐蚀性能是不利的。

关键词：铝镁合金 Y 显微组织力学性能耐蚀性能

The electrical property of MnCo2.4 and its application for SUS 43. metallic interconnect

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science Bulletin 2010年第33期55卷 3835-3841页

作者： HUA Bin1,KONG YongHong1,LU FengShuang2.ZHANG JianFu2.PU Jian1 & LI Jian1 1 College of materials {3. and Engineering,{2. key laboratory of material processing and die & mould technology,huazhong Univer-sity of {3. and technology,wuhan 43.074,china 2.16} Iron & Steel Research Institute Group,Beijing 100081,china

The conductivity of MnCo2.4 spinel,the best route to form the MnCo2.4 protective coating applied by the sol-gel process,and its effect on the intermediate temperature oxidation behavior of SUS 43. alloy,a typical material for the interconnect of solid oxide fuel cell(SOFC),was *** phase structure and surface morphology of the coating and surface oxides were characterized by XRD,SEM and EDS;the "4-probe" method was employed to determine the conductivity of MnCo2.4 spinel and the area specific resistance(ASR)of the surface *** conductivity of MnCo2.4 spinel is excellent,which is 2.orders of magnitude better than that of MnCr2.4 ***-term thermally cyclic oxidation at 750°C in SOFC cathode atmosphere and ASR measurement have shown that calcined in reducing atmosphere followed by pre-oxidation in the air is the best technique for forming the MnCo2.4 protective coating,which enhances the oxidation resistance,and improves the electrical conductivity and adherence of coated SUS 43. alloy *** a result,the MnCo2.4 spinel is the most potential candidate for SOFC metallic interconnect protective coating application.

关键词： solid oxide fuel cell MnCo2.4 oxidation kinetics area specific resistance

原位合成MoSi2.其复合材料的摩擦磨损行为

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特种铸造及有色合金 2008年第S1期 302-305页

作者：胡侨丹严有为李建国上海交通大学材料科学与工程学院华中科技大学材料成形与模具技术国家重点实验室

以Mo、Si和C粉末为对象,利用SPS技术合成致密的MoSi2.MoSi2.SiC复合材料。着重研究了MoSi2.其复合材料的摩擦磨损行为。结果表明,随着载荷的增加,合成材料的摩擦因数减小,磨损率在150N达到最小值;SiC含量的增加,使得材料磨损率逐渐减... 详细信息

以Mo、Si和C粉末为对象,利用SPS技术合成致密的MoSi2.MoSi2.SiC复合材料。着重研究了MoSi2.其复合材料的摩擦磨损行为。结果表明,随着载荷的增加,合成材料的摩擦因数减小,磨损率在150N达到最小值;SiC含量的增加,使得材料磨损率逐渐减小,耐磨性优于单一的MoSi2.料;MoSi2.主要磨损机制为粘着、轻微氧化疲劳磨损,而粘附转移、疲劳磨损和犁削磨损是MoSi2.SiC复合材料磨损的主要机制。

关键词： MoSi2 MoSi2.SiC复合材料摩擦磨损原位合成