最新刊期
卷 32 ， 期 1 ， 2012
- 摘要：The constitutive equation of the alloy was established according to the thermal simulation compression tests of semi-solid billet of ZL201 alloy prepared by a near-liquids semi-continuous casting method.Parameters of power law model,such as apparent viscosity,were presented based on the constitutive equation of semi-solid ZL201 alloy and the Stefan equations.The software Anycasting was applied to simulate and analyze the semi-solid die-casting processes of semi-solid ZL201 alloy.The effects of the ingate size on semi-solid die-casting process of the alloy were investigated,and potential defects in the die casting components were predicted.The results show that the desirable filling process of semi-solid metal slurry can be realized with ingate thickness of 3mm.关键词：Semi-Solid ZL201;Constitutive Equation;Numerical Simulation;Ingate Thickness
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发布时间：2023-12-18 - 摘要：Effects of electromagnetic stirring on the solidification structure and the solute distribution in the superalloy GH3030 billet during solidification process were experimentally investigated and analyzed.The solidification microstructure of GH3030 is composed of the single-phase austenite.Through electromagnetic stirring（EMS）,the dendrites are broken and the nucleation process is accelerated,which are responsible for the refinement of grains and compactness of the solidification structure.Without EMS,the serious microsegregation and the macrosegregation can be observed.With the EMS,temperature gradient at the solidification front is decreased as a result of improving heat transfer behavior in the melt during melt flow,and mixture of the melt with solute enrichment zone with the other melt zone is enhanced.As a result,the macrosegregation and the microsegregation of chromium in the billets are improved,and the chromium in the ingots with EMS is more uniformly distributed,improving significantly the quality of billets.关键词：Superalloy;Electromagnetic Stirring;Solidification;Segregation
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发布时间：2023-12-18 - 摘要：The multi-element aluminum bronze coatings were prepared on polished 45 steel substrate by a supersonic plasma spraying system.The microstructure of coatings and element distribution in the costings were observed by XRD（X-ray diffraction）,SEM（scanning electron microscope）,EDS（energy dispersive spectrometer） and EPMA etc.The results show that the coatings prepared are composed of Cu9Al4,AlFe3 and AlFe phases,and the elements are distributed uniformly into the coatings.The hardness of the coatings prepared by supersonic plasma spraying is superior to that prepared by the traditional plasma spraying.The bonding strength of coatings reaches 59.3 MPa.Easy oxidation coatings similar to multi-aluminum bronze can be prepared by plasma spraying with optimized processing parameters.关键词：Supersonic Plasma Spray;Multi-aluminum Bronze Coating;Microstructure
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发布时间：2023-12-18 - 摘要：Both bulk Cu52.5Ti30Zr11.5Ni6and Cu50.5Ti30Zr11.5Ni6Al2amorphous alloys exhibit high fracture strength of 2 212 MPa and 2 286 MPa,respectively,and the compressive elongation of the both reaches nearly 2.1%.Three different micro-morphologies can be observed on the fracture surfaces of the samples,which correspond to three fracture propagation zones on fracture surface.Meanwhile,localized melting induced by adiabatic heating may occur in the final failure micro-morphology.The elastic-plastic model via shear bands of the tested bulk metallic glasses was verified by micro-hardness and nano-indentation experiments.关键词：Cu-Based Bulk Amorphous Alloy;Compressive Fracture Strength;Microstructure of Fracture Surface;Elastic-Plastic Mechanism
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发布时间：2023-12-18 - 摘要：<正>12月16日,从云冈石窟研究院获悉,云冈石窟窟顶考古在一处北魏至辽金的佛教寺院遗址中,出土的辽金时代的铸造工场,是迄今国内辽金时代保存最完整、规模最大的铸造工场。铸造工场主要包括一处地穴式铸造井台、30座熔铁炉、水井等。这一发现不仅印证了我国17世纪的工艺百科全书——《天工开物》中对宋辽金
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发布时间：2023-12-18 - 摘要：<正>在2011年度中华全国工商业联合会科学技术奖的评审中,经专家评审并由全国工商联主席办公会议审定,共评出科技进步一等奖13项、二等奖36项、优秀奖80项,圣泉集团"快固化、高强度、环保型新一代呋喃树脂"项目荣获一等奖。这充分体现了圣泉在技术研究、开发、创新方面的领先水平
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发布时间：2023-12-18 - 摘要：<正>在中铝贵州分公司电解铝厂广大工程技术人员的努力下,3104电解铝成功地铸造成扁锭。"电解铝液直接铸造大规格3104铝合金扁锭技术开发及产业化"荣获贵阳市2011年科技进步三等奖。3104合金扁锭系3xxx合金扁锭系列,主要用于生产易拉罐,是合金扁锭中技术含量和附加值最
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发布时间：2023-12-18 - 摘要：<正>由黄伯云院士领衔的专家组一致通过对湖南红宇耐磨新材料有限公司研发的"铬锰钨抗磨铸铁磨球"铸件新产品及相关技术的鉴定,认为该技术在行业内具有领先水平。矿山冶炼、钢铁水泥、火力发电等工业领域,需要用研磨机对矿石、煤炭等原材料进行粉碎。这一过程需要磨损、消耗大量的磨球和衬板。矿山冶炼中,这两大关键产品的消耗量几乎占到选矿成本的
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发布时间：2023-12-18 - 摘要：<正>第十二届中国青年科技奖颁奖大会于2011年12月15日在人民大会堂隆重举行。中共中央政治局委员、全国人大常委会副委员长王兆国出席了会议,全国人大常委会副委员长、中国科协主席韩启德致辞。经国务院国有资产监督管理委员会推荐,中国钢研科技集团有限公司、北京纳克分析仪器有限公司陈吉文博士荣获第十二届中国青年科技奖。
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发布时间：2023-12-18 - 摘要：<正>迁安市津唐球墨铸管有限公司创建于2001年,是一家集烧结、炼铁、铸造、铸管于一体的民营企业,现有128m3、210m3高炉各1座、铸件工业园区1个、离心球墨铸铁管生产线2条、铸件生产线3条,拥有固定资产3.8亿元,年产铸造生铁30万吨,各种铸件2万吨、DN100-800离心球墨铸铁管10万吨。10年来,该公司的
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发布时间：2023-12-18 - 摘要：<正>第十二届中国压铸工业暨精品铸件展览会（CMPI）将于2012年3月29～31日在重庆国际会议展览中心举办。CMPI吸引了众多行业知名企业报名参展。压铸机制造商力劲、伊之密,将盛装亮相CMPI2012。力劲集团致力于客户的成功,追求为客户提供整体解决方案,可以为客户提供从厂房规划、机型选择、安装调试、人员培训、工艺流程
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发布时间：2023-12-18 - 摘要：<正>2011年12月27日,在河北省泊头市举行了中国铸造协会实型铸造分会优秀企业荣誉证书颁发仪式。近年来实型（消失模）铸造得到了快速发展,泊头市青峰机械有限公司和泊头市东建铸造有限责任公司不断创新,在消失模铸造和实型铸造领域创造了骄人的佳绩。泊头市青峰机械有限公司于2011年11月采用消失模铸造工艺成功生产了一件20t（4540mm×2400mm×830mm）的汽车模具铸铁件,创造了消失模铸造生产铸铁件
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发布时间：2023-12-18 - 摘要：<正>经过3年的选址、土建及设备安装工作,广东现代铸造有限公司（以下简称"现代铸造"）于2011年12月建成投产。该公司引进技术先进的生产设备;铸造技术达到了国际先进水平,可铸造重达60t的单件球墨铸件;环保技术达到欧盟标准;企业的运作实现全电脑化管理;与香港多家高校联姻,
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发布时间：2023-12-18 - 摘要：<正>云南铜业（集团）钛业有限公司在禄劝的万吨海绵钛项目经过长达3年的筹备期,终于迈出实质性步伐,其工艺技术引进路线日前通过中铝公司组织的专家评审,正式进入开工建设阶段。早在2008年9月,云铜就和禄劝签订了《海绵钛生产项目合作协议书》,共同开发禄劝的钛矿资源。按照协议,云铜将投资12亿元,规划建设年产10万吨钛矿、6万吨高钛渣、1万吨海绵钛等项目。
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发布时间：2023-12-18 - 摘要：<正>"十一五"期间,铸造机械行业企业得到迅速发展,济南铸锻所等传统优势企业保持领先水平,保定维尔、天津亨特等铸机企业进步明显,发展势头强劲。以保定维尔为例,"十一五"期间成为发展最快的5年,其产值由期初的2亿元左右发展到现在的7亿元。有关资料显示,2010年我国铸件总产量已达3960万吨,产值超过了4000亿元,铸件产量连续11年居世
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发布时间：2023-12-18 - 摘要：<正>本书作者周彩瑜先生在生产现场工作几十年,积累了丰富的经验,针对工厂中遇到实际问题特别是疑难问题提出了解决方案。全书分"小经验28则、节约篇、生产技术篇、员工培训及日常管理"4大部分。作者根据自己的经验讲述了深长孔灌砂法、细小孔洞的沾浆法、自制水溶性蜡件、面层涂料涂挂性差怎么办?如何降低蜡的灰份含量,焙烧炉如何
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发布时间：2023-12-18 - 摘要：<正>2011年12月28日,全柴动力控股子公司天和机械年产8万吨铸件项目举行投产仪式。该项目投资总额4.1亿元,采用国际领先的水平静压造型、冷心盒制芯、高效强力混砂等工艺。根据设计工艺,此条铸造线最大可以生产长度为1m的铸件,满足全柴从80系列产品到QC10Z系列
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发布时间：2023-12-18 - 摘要：<正>2011年11月30日,中船重工七二五所双瑞精铸钛业公司（简称双瑞精铸）承担的航天超大钛合金铸件——主承力框,一次浇注成功。该铸件在我国钛合金铸造一次成形产品中创下质量最大、尺寸最大、整体壁厚最薄、结构最复杂四项纪录。据介绍,该铸件经航天科技集团所属单位设计完成后,双瑞精铸凭借设备能力国内最大,以及模具加工精
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发布时间：2023-12-18 - 摘要：<正>中国耐磨铸件分会是是一个以生产耐磨铸件产品的企业为主体的新兴的行业协会组织。自成立以来,中国铸造协会耐磨铸件分会积极发挥其服务、沟通、协调的作用,促进分会理事会单位的成长,推动我国钢铁耐磨铸件行业的发展,充分发挥了行业组织与企业之间的桥梁和纽带作用。
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发布时间：2023-12-18 - 摘要：<正>以"创新、图强、和谐、发展"为主题,由中国铸协艺术铸造分会承办,武汉机械工艺研究所有限责任公司和武汉精密铸造有限公司协办的"中国铸造行业系列会议——第七届中国艺术铸造年会"于11月18日至19日在武汉湖北省委党校举行。本次年会回顾总结了第六届年会以来我国艺术铸造行业及协会工作所取得的进步,展示了本行业近年来
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发布时间：2023-12-18 - 摘要：The material and installation way of electrode for pulsed current were investigated.A long-term and high efficiency electrode was designed for applying pulse current on tundish,which was applied on tundish from Shaanxi Longgang company.The results show that the electrode can be used to apply pulse current smoothly and keep the same life cycle with tundish,meanwhile,the working conditions are greatly optimized.关键词：Tundish;Pulse Current;Electrode;Installation Methods
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发布时间：2023-12-18 - 摘要：Effects of different squeezing ratios on microstructure and properties of AZ80 magnesium alloy in hot extruded process were investigated.The results reveal that the microstructure of the AZ80 alloy is effectively refined after hot-extrusion.The grains are refined increasingly and the tensile strength and yield strength of the AZ80 alloy extruded are obviously improved with increasing in extrusion ratio.The tubes with desirable microstructure and mechanical properties can be obtained by controlling the temperature of billet at 390 ℃ and mold preheating temperature at 360 ℃,half-die angle at 60°70° as well as extrusion ratio of 18.2.关键词：Extrusion Ratio;AZ80 Magnesium Alloy;Microstructures and Mechanical Properties;Tube
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发布时间：2023-12-18 - 摘要：With the help of scanning electron microscopy（SEM） and quantitative photograph analysis software,the effects of Co content varied from 0 to 1.5% on microstructure and mechanical properties of Al-20Si-2Cu-1Ni-0.5Mn alloy were investigated.The results show that,the volume fraction and average diameter of Co-containing intermetallic compounds are increased with the increase of Co content.Meanwhile,the morphology of Co-containing phases is converted from small bulky structure to well-developed dendrites.The addition of Co has a worse effect on the tensile strength of the hypereutectic Al-Si alloy.In addition,the modification effects of Co content on primary Si in the alloy can be ignored.关键词：Hypereutectic Al-Si Alloy;Co;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Effects of Fe content on mechanical properties of Al-Si alloy were investigated,and the microstructure of Al-Si alloy with Fe content less than 0.05%,0.1%,0.3%and 0.5% was observed,meanwhile,fracture morphology of the high purity Al-Si alloy with Fe content of less than 0.05%,0.5% and 1% was analyzed.The results show that the tensile strength and the elongation of the alloy are linearly decreased with the increase of the Fe content when its content is less than 0.5%,while the ultimate tensile strength and the elongation of the alloy reach the minimum value with the slight increase of yield strength with the Fe content in range of 0.5%0.6%.关键词：Casting Al-Si Alloy;Mechanical Properties;Fe Content
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发布时间：2023-12-18 - 摘要：In China,a new period of squeeze casting of iron and steel is coming now.Main production equipment and the technologies are developing to a specialization.The types of the parts produced by the squeeze casting has covered all of the types such as axles and sheathes,wheels,disks and covers,forks,brackets as well as staffs box-types、shell-types work parts.It has been practically proved that the squeeze casting of iron and steel has many advantages such as lower cost and pollution,finer quality,and wider adaptability than traditional sand castings,more suitable for the middle-small parts with high quality requirement.It is paid attention to processing design principle of iron and steel parts and specialited coating based on thermo-mechanical-materials as well as series of sciecifitic mould design and optimized mould materials.关键词：Iron and Steel;Squeeze Casting;Coating
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发布时间：2023-12-18 - 摘要：Based on studying on design of die-casting die,using UGNX4.0 as platform and Visual C++ as programming platform,the frame of die-casting die CAD system and parting module have been built up,realized sucessfully the parting face design in the die casting die CAD system.关键词：Die-Casting Die CAD;UGNX4.0;Parting Face
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发布时间：2023-12-18 - 摘要：Gas pressure,overheat and solidification velocity are the most important parameters influencing the final structure of the lotus-type porous metal which is prepared by metal-gas eutectic directional solidification process（Gasar）.A three-dimensional time-dependent model was developed to describe the heat transfer,mass transfer,gas pore nucleation,growth and merging as well as synergistic growth with solid phase during the formation process of lotus-type porous structure.Corresponding computation program was developed to simulate the porous structure formation and evolution during Gasar solidification by using the finite difference methods to understand the influence of gas pressure and solidification velocity on porous structure of lotus-type metal.The simulated structural parameters such as average pore diameter and porosity of Mg-H system have a well agreement with the corresponding experimental ones,which reveals that the developed model is feasible in structural simulation of lotus-type porous metals.关键词：Metal-Gas Eutectic;Directional Solidification;Porous Metal;Modeling
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发布时间：2023-12-18 - 摘要：With the help of ProCAST software,the filling
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发布时间：2023-12-18 - 摘要：A method for directly measuring the temperature variation in solidification process of squeeze casting has been developed.By using this method,the temperature change during solidification process in squeeze casting A356 aluminum alloy parts was measured,and cooling curves at different locations in a step-shaped parts under different applied pressures were obtained.The microstructure at the locations of temperature measured was observed by using optical microscope,and the grain size was determined.By comparatively analyzing microstructure with cooling curves,the effects of the applied pressure were discribed.关键词：Aluminum Alloy;Squeeze Casting;Temperature Measurement;Microstructure
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发布时间：2023-12-18 - 摘要：There are 8 blades on an impellers,and the blades possess thin and large curved surface.Meanwhile,wheel of impellers exhibits a bigger wrapped force to the mould core.Unreasonable ejector design can result in the deformation or crack of the impeller.So 8 swing blocks and an ejector sleeve are adopted in push-out mechanism.The casting technology was analyzed,and mould structure and the operation process were described.关键词：Swing Blocks;Ejector Sleeves;Pre-Return Pins;Impellers
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发布时间：2023-12-18 - 摘要：Temperature field and velocity vector field in squeezing casting magnesium alloy automobile control arm were simulated by numerical simulation software to predict the possible defects in the control arm during squeezing casting process.Combining with experiments,the position and size of defects occurred in the squeezing casting control arm were analyzed,and the safety performance of the control arm was verified.The results show that the distribution and size of defects are located in range of safety index for produced magnesium alloy control arm with pouring at 680 ℃ and squeezing at 1 m/s as well as holding pressure of 42 MPa,and structure design and forming process meet the performance requirements.关键词：Magnesium Alloy;Squeezing Casting;Numerical Simulation;Defect Prediction
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发布时间：2023-12-18 - 摘要：The development of lightweight and die casting technology for car body/chassis suspension key parts is one of the foremost research fields recently.To meet the requirements of own-brand car named "Trumpchi" belonging to Guangzhou Automobile Group（GAC）,die casting design for the rear sub-frame of the car chassis was performed.The results showed that the gating system and overflow/venting design based on Flow-3D simulation are reasonable,whose filling process is smooth.Good sealing effect can be improved by sealing design at parting surface,ejected pin,and shot pin.where vacuum degree can be reached up to 91kPa within 1s.Temperature-control precision can be improved effectively by adopting several thermocouples positioned temperature measuring in the die and individual adjustment of cooling water flow rate according to the mold temperature.Mass-volumetric production was made by the mold now.关键词：Vacuum Die Casting;Gating System;Die Casting Mold;Rear Sub-frame;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Macroscopic formability,microstructure and mechanical properties of the ZA27 alloy worm gear blanks in permanent mold casting,in liquid forging and in semisolid die forging were investigated under various process conditions.The results show that the microstructure of the worm gear in permanent mold casting is fine-developed dendrite from the addendum to the graduated circle.Absence of dendritie in the addendum and broken phenomenon of the dendrite arm in the dedendum of the worm gear in liquid die forging can be observed,and it is obvious that the dendritic structure in the graduated circle is broken and spheroidized.The refined microstructure in the addendum with uniform distribution and rosette structure in the dedendum are presented in semisolid die forging,and the microstructure in the graduated circle exhibits fine equiaxed grain.It is difficult for the tooth profile of worm gear to form by permanent mold casting,and the worm gear has clear outline with plumptooth profile by liquid forging and the formability is more desirable by semisolid die forging.The mechanical properties of the parts by semisolid die forging are superior to those prepared by permanent mold casting and by liquid forging.
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发布时间：2023-12-18 - 摘要：TiAl alloy blades were produced by investment casting.The complete filling of TiAl alloy blade was realized by controlling gating system design,shell-making,and melting-pouring process.The results show that the shrinkage hole,inclusion and gas hole in the blades can be eliminated effectively by rational designing gating system and improving shell-making process.关键词：TiAl Alloy Blades;Investment Casting;Gating System
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发布时间：2023-12-18 - 摘要：Investment casting technology rapidly develops at home due to its special technological features.There exist some problems in development of investment casting trade including integrated technology level,professional assembly and working-at management.Trade development faces different challenges in international market competition and in the requirement of high quality investment castings from high level equipment manufacturing and in energy-saving as well as exhaustion reduction,environmental protection and utility of employee from the investment casting trade.The investment casting trade would embrace the new prospect future through overcoming above challenges.关键词：Investment Casting;Trade Development;Challenge
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发布时间：2023-12-18 - 摘要：Origination of cold shut and inclusion in grate of incinerator by lost foam casting was analyzed.The effects of pattern density,pouring temperature and pouring ways on the defects were comprehensively analyzed.The optimized processing schemes were presented to effectively eliminate the cold shut and inclusion defects in the grate by lost foam casting,including increasing pouring temperature to 1 620 ℃ and side-pouring way.
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发布时间：2023-12-18 - 摘要：Nano-TiC powder was prepared by a high-energy ball-milling method.The morphologies of the samples milled with different time were analyzed by X-ray diffraction（XRD）,scanning electron microscope（SEM） as well as transmission electron microscopy（TEM）,and the formation mechanism of TiC was presented.The results show that graphite and titanium powder are refined firstly in the milling process,then graphite becomes flake,while titanium powder becomes small particles.And then almost all the titanium powder is wrapped by the flake graphite.When the temperature generated by the collision of ball reaches the reaction temperature of Ti and C,TiC is generated,and the reaction can keep advance with the help of the release heat of the reaction.The size of TiC particles is about 10 100 nm.关键词：Ball-milling;Nano-TiC;Formation Mechanism;Exothermic Reaction
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发布时间：2023-12-18 - 摘要：In a recent decade,the titling gravity process is a very popular process for casting manufacturers,which is beneficial for the discharge of slag and gas from bottom to top during filling and sequential solidification of castings due to integrating the advantages of the bottom gating system and the top gating system.The double-barreled tank possesses a large and thin-wall structure with air-tightness requirement.Some casting defects,such as misrun and cold shut easily,occurred in the castings due to be difficult to form.Some defects in the double-barreled tank as slag and gas hole and the qualification rates of castings after machining and air-tightness testing are greatly improved by the titling gravity casting with optimized gating system and processing parameters.关键词：Tank;Titling Gravity Casting;Gating System
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发布时间：2023-12-18 - 摘要：The effects of different holding time,adding temperatures and addition amount of Al-5Ti-1B alloy wire,which was prepared by electromagnetic stirring and castex process,on grain refinement of pure Al were researched.The results show that the refining efficiency of the alloy wire exhibits desirable with the holding time of 5 min.With the holding time less than 120 min,the obvious fading phenomena can not be observed.The grain size of pure Al is decreased with the increase of addition of alloy wire.The grain refining performance of Al-5Ti-1B alloy wire is satisfied with a refining temperature of 700730 ℃,while with the refining temperature of 690 ℃,local grain size becomes coarsened in the pure Al and the bigger grain size in pure Al occurs when temperature reaches 740 ℃.关键词：Al-5Ti-1B Alloy wire;Castex Process;Electromagnetic Stirring;Grain Refining
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发布时间：2023-12-18 - 摘要：Effects of mould temperature and pouring temperature on hot tearing and fluidity of AZ91D magnesium alloy were investigated.The results indicate that hot tearing resistance of the AZ91D alloy can be significantly improved with the increase of mould temperature.Hot tearing in the AZ91D magnesium alloy can not be observed with preheating temperature of 368℃ at different pouring temperatures.At a lower mould temperature（<268 ℃）,AZ91D alloy exhibits the desirable hot tearing resistance with pouring at 688℃.The influence of pouring temperature on hot tearing resistance is fade with the increase of mould temperature to be disappeared at mould temperature of 368 ℃.Both pouring temperature and mould temperature can obviously improve the fluidity of the AZ91D magnesium alloy,showing the remarkably role.At a lower mould temperature（68 ℃）,a little increase of mould temperature can only increase the fluidity slightly,while with pouring temperature at a higher level（718 ℃）,the effects of the increase of the pouring temperature on the improvement of the alloy’s fluidity can be neglected.In order to get better fluidity and hot tearing resistance,it is suggested for the production of AZ91D magnesium alloy components at a higher mould temperature（≥268 ℃） and suitable pouring temperature（688 718 ℃）.关键词：Magnesium Alloy;Hot Tearing;Fluidity;Mould Temperature;Pouring Temperature
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发布时间：2023-12-18 - 摘要：Effects of Mg content,cooling rate and solution treatment on the tensile properties of Al-6.8Mg-0.3Mn,Al-3.8Mg-0.3Mn alloy were investigated.The results show that the amount of grain boundary phases is increased with increasing in Mg content,and with 6.8% Mg content,network structure occurs in grain boundary.In addition,strength is improved and the plasticity of the magnesium alloy is decreased with the Mg content increases.Mg alloy samples were fabricated in sand casting with air-cooled,metal mold casting with air-cooled,metal mold casting quenched in water to achieve different cooling rates,respectively.The results reveal that absence of flocculent or granular precipitation in the grain boundary of microstructure in quenched sample can be observed,and the strength and elongation are higher than those of the samples fabricated in the other two cooling rates.After 430 ℃ for 60 h solution treatment,comprehensive properties of the two alloys have been substantially improved.Tensile strength and elongation of Al-6.8Mg-0.3Mn alloy in permanent mold casting with air cooled are improved from 280 MPa to 335 MPa and from 10.4% to 20%,respectively,after solid solution treatment.关键词：Al-Mg-Mn Alloy;Mg Content;Cooling Rate;Solution Treatment
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发布时间：2023-12-18 - 摘要：A self-adaptive background forecast algorithm was presented aiming at image identification under complex background in magnesium alloy melt.Through judging whether the gray difference of the current pels’s neighbor pels is more than the threshold valve preset,different background forecast algorithms were self-adaptively selected.If the gray difference is more than threshold value,blocking weight background forecast algorithm is adopted,while it is less than the threshold value,fixed weight background forecast algorithm is selected.Furthermore,the self-adaptive background forecast algorithm was compared with the fixed weight background forecast algorithm and blocking weight background forecast algorithm.The results show that the algorithm not only can reflect the real size of the first bubble better,but also can effectively improve the PNSR（peak signal and noise ratio） and calculating speed.关键词：Magnesium Alloy Melt;The First Bubble;Self-Adaptive Background Forecast;Self-Adaptive Threshold Value;Mathematical Morphology
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发布时间：2023-12-18 - 摘要：The position of thermalcouple’s installition in copper refining furnace directly affects its measurement performance and temperature identification precision.The closer to the inside wall it’s placed,the more precisely temperature is measured,however,thermocouple’s temperature drift error will increase.Based on investigating optimum experimental design theory and thermocouple characteristics,temperature measurement optimum location criterion is presented to determine an optimal location.A nonlinear transient heat transfer model of copper furnace wall in the horizontal direction was established based on the Fronier theory and multi-layer wall characteristics.A FEM simulation was conducted based on Comsol Mutipfysics and Matlab softwares to understand wall heat transfer characteristics.Finally,the criteria distribution was calculated to find out the optimal measurement position in the minimum point by the simulation calculation.关键词：Copper Refining Furnace;High Temperature Measurement;Sensor Optimal Location Problem;Optimum Index
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发布时间：2023-12-18 - 摘要：<正>银槎杯（见下页）元至正乙酉年（公元1345年）造长20cm,高18cm,重616g铸银故宫博物院藏槎,竹木编成的筏。槎杯即槎形酒杯槎杯的造型从仙人乘槎上天河的神话故事而来。槎体作老树槎砑之状,一道人倚槎而坐,执卷吟咏,怡然自得,一派超凡脱俗的气派（见图）。槎杯上铸有"龙槎"
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发布时间：2023-12-18
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