最新刊期
卷 41 ， 期 5 ， 2021
- 摘要：<正>1.会议主办单位中国机械工程学会铸造分会《特种铸造及有色合金》杂志社（武汉）南昌航空大学2.会议承办单位《特种铸造及有色合金》杂志社（武汉）3.会议时间2021年8月3-6日4.会议地点南昌嘉莱特经典国际酒店（江西省南昌市广场南路10号）5.会议议程8月3日全天报到8月4日开幕式及代表合影8月4日及5日上午大会学术报告8月5日下午专题技术报告、青年编委交流会8月6日上午企业参观,午餐后散会
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发布时间：2023-12-18 - 摘要：The hot compression simulation experiment of Ti-5 Al-5 Mo-5 V-3 Cr-1 Zr（Ti-55531） alloy in β phase region with deformation temperature at 860, 885, 910, 935 ℃ and strain rate at 0.001, 0.01, 0.1, 1 s-1 was carried out by the Gleeble3500 thermal compression simulation machine.The microstructure evolution of the Ti-55531 was analyzed by OM.The results reveal that the dynamic softening effect of Ti-55531 alloy during the hot deformation is dominated by the dynamic recovery, and the microstructure is characterized by dynamic recrystallization at low strain rate.In order to describe the flow stress behavior by the material deformation mechanism, a unified constitutive model of Ti-55531 alloy based on dislocation density in β phase region was established considering the influence of hardening and dynamic softening mechanism on the dislocation density.The results indicate that the prediction model can accurately predict the hot deformation behavior of Ti-55531 alloy in β phase region.关键词：Ti-55531 Alloy;Hot Deformation;β Phase Region;Microstructure Evolution;Constitutive Model
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发布时间：2023-12-18 - 摘要：Al-5 Zn-2 Mg-1 Cu-0.2 Sc alloy was fabricated by rheo-squeeze casting. The effects of pouring temperature on the microstructure and mechanical properties of semi-solid slurry and rheo-squeeze casting alloy were investigated by tensile test, SEM and TEM. The results reveal that with the decrease of pouring temperature, the morphology of the primary α-Al phases in semi-solid slurry and rheo-squeeze casting alloy is gradually converted to the nearly equiaxed ones, and the second phase near the grain boundaries is more evenly distributed, with the average grain size decrease and the roundness increase.When the pouring temperature is 700 ℃, the size of the primary phase in the semi-solid slurry reaches about 35 μm with the average shape factor around 0.49, and the average grain size of the rheo-squeezecasting alloy is about 43 μm.The mechanical properties of rheo-squeeze casting alloy are enhanced with the decrease of pouring temperature. After 470 ℃×10 h+500 ℃×2 h solution treatment, most of the second phase is dissolved in the matrix. After 120 ℃×24 h aging treatment, the yield strength, tensile strength and elongation of Al-5 Zn-2 Mg-1 Cu-0.2 Sc alloy reach 539 MPa, 612 MPa and 11%, respectively.关键词：Rheo-squeeze Casting;Al-5Zn-2Mg-1Cu-0.2Sc Alloy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：5356 aluminum alloy with different Mg content was prepared by vacuum-argon melting casting method. The purification effect of vacuum melting on aluminum alloy melt was analyzed, and the effect of different Mg content on the microstructure and properties of 5356 aluminum alloy was described. The results show that, the degassing and impurity removal effects are significant, and the size and content of oxide inclusions are greatly reduced under vacuum melting conditions. Mg is easy to form a network of non-equilibrium phase α-Al+Al3Mg2 at the grain boundary. With the increase of Mg content in 5356 aluminum alloy, the tensile strength of the alloy is increased with dccreasing in elongation. The optimum Mg content is 5.0%.关键词：Mg Content;Vacuum-argon Melting;5356 Aluminum Alloy;Microstructure and Properties
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发布时间：2023-12-18 - 摘要：In order to control the shrinkage dimension more accurately and improve the precision of casting dimension, and a new design method to improve the dimensional accuracy of casting was presented. ZL205 A alloy was taken as the research object. The castings assigned with shrinkage rate of three kinds of castings including traditional, global envelopment density and local envelopment density by numerical simulation method, then, they were simulated and compared. The simulation results showed that the method based on local envelope density was the best for controlling the shrinkage dimension precision of casting, and it was a calculation scheme that can quantify the influence of local constraints and improve the precision of local dimension of casting. It was better than traditional experience and overall envelope density assignment.关键词：Numerical Simulation;Local Envelope Density;Shrinkage Dimension;Accurate Design;Size Control
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发布时间：2023-12-18 - 摘要：The as-cast structure, solid solution and aging characteristics and structure changes of Cu-15 Ni-8 Sn alloy with Mg content of 0.05%～0.30% were investigated. The experimental results indicate that Mg is segregated in the Sn-rich phase at as-cast state, and significantly inhibits the discontinuous precipitation during the alloy aging process, thus improving the mechanical properties. When the ageing time is 6 h, with the increase of Mg content, the alloy hardness is increased and the electrical conductivity is decreased. The hardness and conductivity of the alloy with 0.3% Mg are 369 HV and 4.85 MS/m, respectively, which are increased by 11 HV and decreased by 0.26 MS/m compared with those of one without Mg.关键词：Cu-15Ni-8Sn;Discontinuous Precipitation;Magnesium;Solution Treatment;Hardness
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发布时间：2023-12-18 - 摘要：The carbon fiber M40 J was woven with two braided structures（3 D orthogonal and laminated stitch）, and the Cf/Al composites were prepared by vacuum pressure infiltration method. Tensile tests were carried out on notched specimens and smooth specimens with the same size. Microstructure and interface characteristics of the composites were observed and analyzed by SEM and TEM. The tensile properties of two kinds of braided Cf/Al composites with notches were investigated, and the influence of notches on the properties of composites and the sensitivity of composites with different braided structures to notches were analyzed. The results show that the tensile properties of Cf/Al composites with two kinds of braided structures are obviously weakened due to the notches. The tensile strength of notched specimens of 3 D orthogonal Cf/Al composites is decreased by 141.3 MPa compared with that of smooth specimens to about 23.7%, and its notch tensile sensitivity coefficient is 1.31. The tensile strength of notched specimens of laminated stitch Cf/Al composites is decreased by 121.8 MPa compared with that of smooth specimens about 28.9%, and its notch tensile sensitivity coefficient is 1.41. The laminated stitch structure is more sensitive to the notches than the 3 D orthogonal structure.关键词：Cf/Al Composite;3D Orthogonal;Laminated Stitch;Notch Tension
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发布时间：2023-12-18 - 摘要：The uniaxial stretching process of single-crystal magnesium containing voids was simulated by molecular dynamics and embedded atom method,and the influence of tensile crystal orientation and void shape on the growth and deformation of voids was investigated.The results show that the microscopic mechanism of the void growth and deformation of single crystal magnesium is different when the crystal orientation is stretched.Stretching along the■crystal direction,cracks perpendicular to the stretching direction appear inside the crystal.As the loading progresses,the cracks and voids coalesce and the voids grow eventually lead to material failure,while stretching along the[0001]crystal direction,dislocations nucleation occurs on the surface of the cavity and stacking faults appear.As the loading progresses,the stacking faults become the nucleation point of twins.The twins begin to grow up and gradually occupy the entire crystal and eventually lead to material failure.Different cavity shapes have little effect on the Young’s modulus of the material,however it will has a certain effect on the yield strength of the single crystal Mg.Stretching along the■crystal direction,it is taken easier for the crystals containing spherical voids to produce perpendicular to the stretching at the middle position.Directional cracks,cracks and cavities coalesce can result in the material failure,so when stretched along the■crystal direction,the yield strength of the material with spherical cavities is the smallest.关键词：Molecular Dynamics;Single Crystal Magnesium;Crystal Orientation;Void
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发布时间：2023-12-18 - 摘要：<正>据国际铝业协会数据,2021年3月,全球氧化铝产量572.5万t,环比增长10.37%,同比增长4.97%。一季度,氧化铝产量累计达到1663.9万t,2020年同期为1606.5万t,同比增长3.57%;2020年四季度产量为1 681.5万t,环比下降1.05%。3月,中国氧化铝产量为331万t,环比增长10.30%。一季度,中国氧化铝产量累计达到963.1万t,2020年同期为905.2万t,同比增长6.40%。
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发布时间：2023-12-18 - 摘要：<正>2020年,钛材需求最大的波音、空客等国际航空企业受疫情影响,订单大幅减少,从而使国际钛需求量大幅下挫。以俄罗斯为例,全年钛加工材料产量只有2.6万t,同比下降23.5%,但我国钛工业一枝独秀,钛材产量达到近10万t,占全球的钛材产量的50%以上,预计全球钛加工材料产量将接近20万t,同比有所增长。
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发布时间：2023-12-18 - 摘要：<正>4月29日,蔚来汽车"NeoPark新桥智能电动汽车产业园区"在合肥市经开区举行开工仪式。NeoPark将打造世界级智能电动汽车产业集群,开展整车、核心零部件、自动驾驶等创新性研发,打造具有全球竞争力、引领性的创新链;引入数百家关键配套企业,形成完整与高度聚集的产业链。
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发布时间：2023-12-18 - 摘要：<正>4月10日,重庆大学与广东省国研科技研究中心有限公司"固态镁基储氢材料及技术开发与应用"重大合作项目签约仪式在重庆大学举行。根据合同约定,广东省国研科技研究中心有限公司将在5年内投入5亿元开展固态镁基储氢材料及技术的研发与产业化合作,其中,本次签约的"固态镁基储氢材料及技术开发与应用"的研发计划投入1.5亿元,同时,该项目还为重庆大学启动镁电池的研究和开发工作提供资金支持。高效安全的储能技术是全球新能源开发与应用的重大技术瓶颈。
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发布时间：2023-12-18 - 摘要：<正>力劲9000T智能压铸单元全球发布会暨签约仪式,在力劲集团（宁波）压铸生产基地（宁波力劲科技有限公司）隆重举行。来自各级铸造及压铸行业协会、压铸企业、模具企业及媒体代表,共同见证了9 000 t超大型压铸机的全球发布、力劲集团&瑞立集团大型智能压铸单元签约仪式。同期,主办方还举办了"2021宁波压铸产业发展高峰论坛"、"力劲宁波压铸机工厂开放日"活动。力劲集团、瑞立集团、发那科三方相互签约仪式,在宁波力劲科技有限公司培训中心进行。
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发布时间：2023-12-18 - 摘要：<正>魏桥轻量化基地的宏和公司正加紧生产一批发往敏实公司的新能源汽车电池端板,这些产品将被应用在大众汽车公司的新能源汽车上。作为基地第一个建成投产的轻量化汽车项目,宏和公司目前已启动了17个模具设计和制造项目,其中4个项目已经实现量产。
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发布时间：2023-12-18 - 摘要：<正>为规范汽车零部件再制造行为和市场秩序,保障再制造产品质量,推动汽车零部件再制造产业高质量发展。国家发展改革委、工业和信息化部等八部门,近日联合印发了《汽车零部件再制造规范管理暂行办法》（简称《暂行办法》）。《暂行办法》共八章、三十六条,对再制造企业规范条件、旧件回收管理、再制造生产管理、再制造产品管理、再制造市场管理、监督管理等作出了明确规定。
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发布时间：2023-12-18 - 摘要：<正>据海关数据统计,2021年一季度国内镁合金出口累计总量达3.69万t, 较去年一季度出口总量3.73万t下降478 t, 同比下降1.28%。2021年3月份我国镁合金出口总量约为1.5万t, 环比增长47.3%,同比下降80%。
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发布时间：2023-12-18 - 摘要：<正>今年以来,安徽居巢经开区加快建设镁基新材料和大交通轻量化产业基地,全力推进5个镁基新材料、大交通轻量化产业项目快建设、早竣工、早投产,致力打造中国镁业"策源地"。经开区夏阁园区突出"体量",重点发展3C产品壳体及支撑件、汽车电池组、汽车轮毂、医疗器械等新型镁合金材料,同时,围绕铸造等机械零部件加工,大力发展汽车镁合金精密压铸件;并充分发挥宝钢金属、云海镁业、宜安科技等骨干企业的"导热管""磁铁棒"作用,不断拓展镁基新材料和大交通轻量化产业链,寻求更多高技术含量的产业突破。
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发布时间：2023-12-18 - 摘要：<正>全国大学生思想政治活动会议提到,思想政治教育需要关注学生、服务学生,并不断提高大学生的文化素养、道德素质、思想素养以及政治意识,培养综合性的人才。高校课程思政教育不仅是思想政治教师的工作,而且各个学科的教师都应将思想政治教育与课堂相融合,系统且有效地提升学生的综合能力,对此,所有的教师都有义务与有责任去落实这一思想。思政教育现在是高校教育中的重要内容,而作为一个特殊群体的铸造类学生则更加值得注意。对此,将以铸造类专业为例,分析当前铸造类专业课程思政的现状与主要难点,并提出有效的创新方向。
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发布时间：2023-12-18 - 摘要：<正>经济全球化的今天,我国开放更多的产业。作为WTO的支柱型知识贸易,中国的期刊产业也将在一定程度上受到影响,并面临严重的考验以及前所未有的机遇。科技期刊是是我国期刊行业中关键的组成,也是我国期刊行业的主要力量之一。近年来,期刊界持续关注着科技期刊的影响力以及可持续发展。科技期刊的资源非常丰富,在知识资源以及人力资源上都有很大的优势。将它们应用于铸造公司的知识管理当中,对铸造公司的长期发展具有很大的好处。简要介绍了科技期刊的资源以及铸造公司的知识管理。在总结了企业知识管理的基础知识之后,分析把两者有效融合的好处以及重要性,最后分析了科技期刊资源与铸造类公司进行知识管理的融合路径。
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发布时间：2023-12-18 - 摘要：<正>全球经济化发展加剧,我国的企业与国外优秀企业的沟通和交流也逐年增多,国际贸易之间来往也逐渐增多,英语网站作为企业对外宣传的有效平台能够最大限度展现企业的形象、实力以及能力,通过英语网页来将企业优势和发展展现给国外客户,达到维护原有客户,吸引和挖掘潜在客户的效果,从各个角度体现出企业官网的重要性。
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发布时间：2023-12-18 - 摘要：<正>语言学家Eugene A.Nida最早提出了功能对等理论。这一理论指出,翻译需要主张功能上的翻译内容对等。换句话说,翻译应在实现语言间的功能对等,而不是过分地对文本的对应性以及语法的准确性。奈达提出的功能对等理论,可以有效地降低源语言以及目标语言两者间在翻译上的标准,并降低出现不同翻译的次数。在翻译过程中,对等、自然且适当的方法是反映翻译原文的含义以及信息的重要方法。某些翻译当中需要在句子以及词汇层面体现对等的翻译。在功能对等理论的指引下,可以确保翻译中英语文本的准确性,并体现翻译原文语言的文化含义。
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发布时间：2023-12-18 - 摘要：<正>伴随经济的迅猛增长,我国工业自动化水平的持续进步,使得高温铝合金铸造技术也得到很大的发展。铝合金在化工、船舶、机械制造、汽车制造、交通运输等领域的普及以及应用,对其抗腐蚀性、精密度以及韧度的要求越来越高。国内外该领域的专家以及公司也不断加强研究高温铝合金铸造的生产、加工技术以及自动控制技术,并将工业自动化控制与计算机控制技术实现有效融合,以提高高温铝合金的铸造效率与精度,从而缩小我国与发达国家在自动化控制上的差距。铝合金计算机中央控制系统中,高温铝合金铸造机是重要的铸造设备,其稳定性对铸锭的生产效率以及质量起到重要的作用。
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发布时间：2023-12-18 - 摘要：<正>多年来,终身体育、阳光体育等体育教育理念在国内不断兴起,已经为创新高校体育的教学模式提供了重要的前进方向,然而高校铸造行业的体育教学模式在现实的创新性改革中效果不佳,仍然受制于传统的教学模式。深人研究高校铸造行业的体育教育当中的难点与重点,针对性地创新教育模式以提高教育效能,是当前高校铸造行业实现体育教育改革的热点。将结合教育实践分析高校铸造行业的体育教学模式的问题,并对创新其教学模式提出自己的建议。
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发布时间：2023-12-18 - 摘要：<正>新时代发展日新月异,计算机技术与数值模拟技术也得到了快速的发展,铸造合金的凝固过程通过数值模拟技术正在从宏观逐渐转变为微观。通过微观模拟能够提供精准的热释放信息,同时也能够得到材料的凝固组织。在铸造凝固过程中通过结合宏观与微观的现象来进行计算机模拟,对铸造凝固进行预测。针对铸造合金凝固组织的模拟研究,主要通过阐述凝固组织的特征以及模拟微观组织的优势与劣势。
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发布时间：2023-12-18 - 摘要：<正>思想政治教育作为各高校铸造类专业的教育管理中的主要构成,伴随新时代的到来以及科学技术的发展,学生实现了和外界的广泛交流。然而学生的认知能力并不健全,社交经验非常有限。由于社会环境的迅速发展以及许多诱惑,很难做出正确的决定以及选择。在当今社会,学生面临着更大的就业以及生存压力,教师必须做好学生的心理建设,提高他们在心理上的承受能力。所以,对高校铸造类专业学生而言,创新思想政治教育的方式,可以有效地提高学生的思想政治素养,实现学生的全面发展。
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发布时间：2023-12-18 - 摘要：In order to understanding the formation and microscopic mechanism of zirconium hydrogen precipitation, a diffusion model of hydrogen atoms in ε-ZrH2 was established. Based on the first principles, the properties of ε-ZrH2 gap occupancy stability, hydrogen atom diffusion path, and diffusion mobility under different pressures were investigated. The results indicate that ε-ZrH2 is a body-centered tetragonal structure with two octahedral gaps and two tetrahedral gaps. The interstitial sites of hydrogen atoms are all stable. Hydrogen atoms preferentially occupy tetrahedral interstitial sites and tend to diffuse along the c-axis. Pressure can increase the diffusion activation energy and reduce the diffusion coefficient, which is decreased with increasing in pressure.关键词：ZrH2;Hydrogen Diffusion;Pressure;First Principle
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发布时间：2023-12-18 - 摘要：The laser-MIG hybrid welding process was used to weld 6082 aluminum alloy medium and thick plates. After the welding was completed, the microstructure observation, hardness test and tensile performance test of the weld were carried out. The results show that with the laser power of 4.5 kW, the welding speed of 1.2 m/min, the defocus of +5 mm, and the wire feed speed of 8 m/min, the weld surface presents desirable. The microstructure of the weld fusion zone is uniformly equiaxed dendrites with smaller grains, narrow heat-affected zone, and the structure of the upper part of the weld is smaller and denser than that of the lower part of the weld. Meanwhile, the hardness of the heat-affected zone of the welded joint is higher than that of the base metal and the center of the weld. The average tensile strength of the joint reaches 251.9 MPa, which is close to the base material.关键词：6082 Aluminum Alloy;Laser-MIG Hybrid Welding;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The hot cracking occur easily in ZL205 A alloy during solidification process. However, the lack of constitutive model in the high temperature makes it considerably difficult to predict hot cracking. The linear elastic, elasto-plastic and elasto-visco-plastic constitutive models which are suitable for the mushy alloy of ZL205 A was evaluated by the simulation of ProCAST software, which was compared with the actual pouring test of hot crack on this basis. The results indicate that the elasto-visco-plastic constitutive model is more suitable for the mushy alloy of ZL205 A, and the stress is mainly concentrated at the intersection of the flange and the thin-wall of large-sized thin-wall cylindrical component with the constitutive model. The deformation of cylindrical component is effectively improved when the height of tiepiece is increased from 19 mm to 48 mm.关键词：ZL205A Alloy;Visco-elasto-plastic Constitutive Model;Thin-wall Cylindrical Component
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发布时间：2023-12-18 - 摘要：Friction stir processing（FSP） technology was used for single pass processing of 5086 aluminum alloy. The microstructure, mechanical properties, storage modulus and damping behavior of the alloy were investigated. The results reveal that the grain in 5086 aluminum alloy is refined after FSP, and the number of second phase particles and dislocation density are decreased obviously. After FSP, the elongation of 5086 aluminum alloy is significantly enhanced, and the elongation of low rotation speed FSP sample reaches 22%, which is 83% higher than that of base metal. At 350 ℃, the internal friction value of low rotation speed FSP is 0.068, which is 55% higher than that of base material. When the strain is higher than 0.06%, small grain boundaries occur to slip and induce grain boundary damping, which takes the damping properties of FSP samples superior to that of base metal. The storage modulus of 5086 aluminum alloy is increased with the increase of temperature and strain, respectively, and the storage modulus of FSP samples is significantly higher than that of base metal.关键词：Friction Stir Processing;5086 Aluminum Alloy;Microstructure;Damping Behavior
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发布时间：2023-12-18 - 摘要：A test model of YOLOv3-Mv2 was proposed to detect the scratches and defects of castings. Firstly, a smaller skeleton network MobileNetv2 instead of the original feature extraction network structure Darknet53 was chosen to reduce the amounts of computational parameters of the network and to accelerate detection. Secondly, a new detection scale based on the fusion of deep and shallow features was added to enhance the detection capability of the small defect target.Then the parameters of the BN layer were recalculated, sharing connected area data with the reel layer to speed up the forward inference of the model. Finally, the Complete IoU function was introduced to improve positioning accuracy. The results indicate that the average accuracy（mAP） value and the real-time performance of YOLOv3-Mv2 were improved by 5.42% and 23 f/s than those of the original YOLOv3 algorithm, respectively.关键词：Defect Detection;MobileNetv2;Merge Parameters;Detection Scale;Loss Function
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发布时间：2023-12-18 - 摘要：In view of complex modeling gating system, the parametric automatic modeling design was performed in the Creo environment for secondary development. Based on family table technology and combined with Pro/TOOLKIT for secondary development, the key technologies and development steps of parametric automatic modeling were introduced, making up for the defects of freedom and poor interaction of automatic modeling through family table. The modeling speed was greatly improved, and the design efficiency was increased overall via the above parametric automatic modeling.关键词：Parameterization;Family Table;Secondary Development;Pro/TOOLKIT
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发布时间：2023-12-18 - 摘要：The self-developed casting simulation software EasyCast and the NovaCast software were used to simulate the low-pressure casting process of magnesium alloy partition. It was found that the solidification process of plate castings didn’t follow the principle of sequential solidification, and there existed shrinkage cavity. The process was improved by adding chiller. Before and after the improvement, the solidification temperature field predicted by the two software were basically the same. Although the size of the shrinkage cavity predicted was slightly different, the position of shrinkage cavity was roughly the same. It shows that the simulation conclusion is reliable. As a result, most of the casting thickness is prone to shrinkage cavity and porosity. Through setting chiller, the effect of shrinkage can be enhanced and shrinkage cavity can be improved.关键词：EasyCast;NovaCast;Numerical Simulation;Low Pressure Casting
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发布时间：2023-12-18 - 摘要：Injection mechanism is important for filling and forming in squeeze casting equipment. The fit clearance of its components greatly affects the accuracy and stability in the injection process. To minimize the change of fitting clearance during injection, a multi-objective optimization method based on the Kriging metamodel was proposed which taken into account for the clearance rate and temperature difference as the objectives, and considered the key parameters of the injection mechanism and process such as initial clearance and pouring temperature. The results show that the accuracy of Kriging metamodel is higher than 0.97. Meanwhile, the optimized process parameters were presented as follows: casting pouring temperature of 701 ℃, shot-sleeve preheating temperature of 338 ℃, shot-sleeve wall thickness of 16 mm, initial clearance of 0.1061 mm and injection velocity of 56 mm/s, where the clearance rate is reduced by 10% and the heat transfer temperature difference is reduced by 49% after optimization. In addition, the filling process is more stable.关键词：Injection Mechanism;Process Parameters;Multi-objective Optimization;Squeeze Casting
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发布时间：2023-12-18 - 摘要：Based on 3 D technology, a 316 L stainless steel green body was prepared, solidified and degreased, and then high-vacuum sintered at 1 385 ℃, 1 410 ℃ and 1 435 ℃ to verify the feasibility of pressureless sintering and densification of the printing green body. The influence of sintering process on density, mechanical properties and tensile fracture of the specimens was investigated. The results show that it is feasible to achieve densification of printed blanks through pressureless sintering. With the increase of the sintering temperature, the density of the samples increased and the size contraction is increased, and the mechanical properties such as the strength and plasticity are also greatly improved. With sintered at 1 435 ℃, its relative density reaches 88.7%, and the volume shrinkage rate is 37.0%, the yield strength is 160 MPa, which is close to the level of 177 MPa. Meanwhile, the tensile strength is 355 MPa, and the elongation reaches 26.4%.关键词：3Dp Technology;High Vacuum Sintering;Pressureless Sintering;Sintering Process;Densification
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发布时间：2023-12-18 - 摘要：The import and domestic consumables of inkjet sand mold 3 D printer were investigated comparatively. The silica content, microstructure, grain size distribution, moisture content, bulk density, apparent density of raw sand was analyzed. The pH value and viscosity index of the resin and blinder were tested. The proportion process of imported and domestic consumables when printing and the modification method of domestic resin were explored. The results indicate that the domestic sand can directly replace the import one, which has similar performance parameters. As an important index of resin, viscosity need to match with the print nozzle, which is the core component of the printer. The viscosity of imported resin is about 15 mPa·s, while that of domestic resin is about 25 mPa·s. Therefore, domestic resin needs modification before used for printing. Through the design of the orthogonal experiment on the type of raw sand and resin as well as the ratio of resin, the standard eight-character block was prepared and the tensile strength and air output were tested. The results demonstrate that the ratio of resin has the greatest impact on the tensile strength, and when the standard bars use the combination of domestic furan resin x2 with addition of 2% and domestic silicon sand Z1 as raw material, the tensile strength meet the printing requirements. The results of modification experiment on domestic resin indicate that the optimal amount of modifier is 10%, where sand mold still exhibits enough strength, and the modification is achieved meanwhile.关键词：Inkjet Sand 3D Printing;Consumable Materials;Modification Process
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发布时间：2023-12-18 - 摘要：The mechanical properties and microstructure of TC4 titanium alloy prepared by selective laser melting（SLM） after annealing treatment were investigated. The results show that the TC4 sample formed by selective laser melting is mainly composed of acicular α′ phase. With the increase of annealing temperature, α′ is gradually decomposed into α+β phase, and gradually transformed from Widmannstatten structure to basket structure. The elongation is increased gradually with decreases of the yield strength, and the tensile fracture presents ductile fracture. The results show that the alloy present the satisfied mechanical properties with annealing at 800 ℃ for 90 min, with a tensile strength of 902.43 MPa and elongation of 2.38%.关键词：Selective Laser Melting;TC4 Titanium Alloy;Annealing Treatment;Mechanical Properties;Microstructure
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发布时间：2023-12-18 - 摘要：In view of the characteristics of the aluminum alloy special-shaped connecting pipe is difficult to separate and the sand core is difficult to design and manufacture, the casting process design of sand mold 3 D printing technology is adopted to realize the fast moldless manufacturing. The sand mold 3 D printing technology can realize fast moldless production, improve dimensional accuracy, shorten production cycle, reduce the cost of new product development, and provide a reference for similar parts in the future.关键词：Sand Mold 3D Printing Technology;Aluminum Alloy Special-Shaped Connected Pipe;Sand Core Design
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发布时间：2023-12-18 - 摘要：Electromagnetic stirring and rare earth refiner were applied to prepare semi-solid slurry of A356 aluminum alloy with different Ce content. The effects of electromagnetic stirring on the Ce distribution were analyed comparatively, and Ce content variation along the radius direction was analyzed. The results indicate that the alloy has a desirable refinement effect with the Ce addition of 1.0%, where the most grain shape present equiaxed structure. The electromagnetic stirring can seriously influence distribution of rare earth element, and the rare earth microsegregation occurs at the maximum rotation rate of the metal melt, thus making the rare earth atoms distributed more evenly and reducing macrosegregation.关键词：Electromagnetic Stirring;Aluminum Rare Earth Compound;Segregation
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发布时间：2023-12-18 - 摘要：According to the problems in coarse primary silicon and acicular eutectic silicon in traditional hypereutectic Al-Si alloy, the semi-solid slurry of Al-28 Si alloy was prepared by serpentine channel composite Sr modification process. The microstructure of the semi-solid slurry and the precipitation temperature of primary silicon were investigated. The results reveal that the composite process can fully refine the primary silicon and effectively modify the eutectic silicon. The primary silicon is refined from 165.26 μm to 45.68 μm, and the structure of eutectic silicon is transformed from acicular to punctate and worm-like. With the increase of the Sr addition, the precipitation temperature of primary silicon is increased at first and then decreased, and the grain size shows an increasing trend. The growth of eutectic silicon with a large number of fibrous branches is limited by aluminum phase.关键词：Al-28Si Alloy;Serpentine Channel;Sr;Primary Silicon;Eutectic Silicon
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发布时间：2023-12-18 - 摘要：Based on Ti48Zr18V12Cu5Be17 metallic glasses composite, the effects of semi-solid isothermal treatment（SSIT） and recrystallization and partial remelting（RAP） on the microstructure and properties of the amorphous composites were investigated. The results show that after SSIT and RAP, phase transformation is absent, however the microstructure is converted from small dendrites to coarse strip crystal and near-spherical crystal. Due to recrystallization, the microstructure of RAP is finer and rounder than that of SSIT. The RAP ed composites has the best plasticity（20.43%） which is 8.27% higher than that of SSIT and its compressive strength（1 829.45 MPa） and yield strength（1 144.06 MPa） are also higher. The fracture of RAP can be observed the maximum density of veins and smooth area and molten drop also exist in three kinds of materials. The shear bands of as-cast composited are easy to penetrate the grain. In addition to the shear band, there exsit a large number of slip bands in the grain of SSIT. The propagation of shear bands in the amorphous matrix of RAP is hindered and multiple shear bands are generated. The parallel and crossed slip bands in the grain indicate that the grain can absorb more energy and withstand greater plastic deformation.关键词：Recrystallization and Partial Remelting;Semi-solid Isothermal Heat Treatment;Metallic Glasses Composites;Mechanical Property
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发布时间：2023-12-18 - 摘要：As an engineering structural material with ultra-light weight, high specific strength and good heat resistance, rare-earth containing magnesium alloys（Mg-RE alloys）have been acknowledged as one of the most promising candidate for aircraft, aerospace and railway transportation applications. The alternating load in actual service puts forward a strict requirement on the fatigue performance of Mg-RE alloys. In order to ensure the durability and safety of load-bearing structural parts, it is of great significance to understand their fatigue behavior and fracture failure mechanism in depth. The research progress in the fatigue properties of Mg-RE alloys was expounded, focusing on the microscopic mechanism of fatigue crack initiation and propagation. After that, the heat treatment, grain refinement, surface strengthening and many other ways were described to improve the fatigue properties of Mg-RE alloys. Finally, essential futuristic works devoted to the research of fatigue behavior were prospected.关键词：Mg-RE Alloy;Fatigue Behavior;Crack Initiation and Propagation;Microstructure Regulation
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发布时间：2023-12-18 -
Process Design and Optimization of Semi-solid Die-casting of Box Lid Based on Cloud Computing Router
摘要：The semi-solid die-casting process and die of 5 G wireless router box cover were designed. The semi-solid rheological die-casting filling process was simulated by using the CAE cloud platform. An optimal die-casting process was selected for the production test. The results indicate that numerical simulation carried out by cloud computing can provide a scientific basis for the evaluation and improvement of process scheme, shortening the development cycle of new products. The die casting mould of router box cover was designed and manufactured according to the simulation and optimization process, and qualified die casting parts of router box cover without shrinkage and porosity were produced by using semi-solid die casting process.关键词：Router Box Cover;Cloud Computing;Process Optimization- 2
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发布时间：2023-12-18 - 摘要：The natural air cooling, spraying cooling and water channel cooling of die casting die were simulated by FLOW-3 D CAST software. The effects of cooling methods on the temperature of die casting die were analyzed, which compared with the actual measurement of mold temperature verification. Finally, the simulation results of FLOW-3 D CAST using spraying process module were compared with traditional spraying simulation. It is concluded that spray cooling can more accurately simulate die casting die temperature.关键词：Numerical Simulation;Die Surface Temperature;Die Temperance Control;Die Cooling;Air Cooling;Water Cooling;Spray Cooling
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发布时间：2023-12-18 - 摘要：Based on the structure of the pump body, die casting process was designed and simulated by the ProCAST software. Taking injection speed, pouring temperature, mold preheating temperature as factors, the orthogonal expriment was designed. Through analyzing the air entrainment and shrinkage defects in the pump body, the results reveal that there exists the least air entrainment and shrinkage defects with 2.5 m/s of injection speed, 660 ℃ of pouring temperature and 230 ℃ of mold preheating temperature. Using the optimized parameters, the qualified pump body was produced successfully, meeting the actual requirement.关键词：Pump Body;Die Casting Process Design;Numerical Simulation;Optimized Parameters
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发布时间：2023-12-18 - 摘要：Aluminum alloy differential case is one of the key components of automobile transmission system, which has relatively complex structure and high internal quality requirements. In the process of production and manufacture, the product was processed on a large area, taking the internal defects of the product exposed to increase greatly, such as inclusion and gas hole. In order to solve the problem of high reject rate caused by molding defects, the filling process of aluminum alloy was compared with the actual casting defect location by numerical simulation method, and then the product structure was dissected and analyzed to optimize the gating system. It is concluded that more reasonable pouring can improve the risk of process exposure and reduce the reject rate.关键词：Differential Housing;Numerical Simulation;Gating System;Forming Defects;Reject Rate
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发布时间：2023-12-18 - 摘要：The origination of fluorescent displays in ZTA7 titanium alloy casting after long-term trial run was analyzed. The microstructure of castings after cutting was investigated by SEM,metallographic examination and hydrogen content test was carried out. The results indicate that the microcrack fractures are characterized by brittle cleavage without obvious oxidation and common defects, such as shrinkage and inclusion, in area of microcrack sources, and no abnormality occurs in the microcrack area.It can be inferred that there is absence of defect in casting, and possibility of microcrack cleavage caused by casting defect is excluded. In addition, cracks appear on the machine surface after fluorescent detection of untested castings in same batch, proving that residual stress leads to the microcracks.关键词：ZTA7 Titanium Alloy Casting;Fluorescent Display;Microcrack;Fracture Feature;Residue Stress
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发布时间：2023-12-18 - 摘要：Valve body isprone to shrinkage porosity, shrinkage and other defectsin the casting process. After three-dimensional modeling and meshing of the valve body parts, the filling and solidification process were simulated based on ProCAST software to predict the possible positions of shrinkage porosity, shrinkage cavity and other defects in the casting process. According to the simulation results, the gating system, pouring temperature, and process scheme was optimized to reduce the occurrence of defects, improving the casting quality. The results indicate that when the top gating system is used with filling time of 13.4 s and the pouring temperature controlled at 1 550 ℃, the filling process is stable, and the shrinkage defects are effectively controlled.关键词：35CrNiMo;Valve Body;Investment Casting;Numerical Simulation;Shrinkage;Gating System
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发布时间：2023-12-18 - 摘要：<正>2021年"第27届中国铸造协会消失模V法实型分会"年会,根据疫情形势预期于2021年7月～8月举办。为做好消失模V法实型铸造分会年会交流内容的组织工作,营造良好学术氛围,推动消失模铸造行业创新、协调、绿色、开放、共享发展,促进行业单位之间交流与合作,展示自身在技术研发、管理创新、生产实践方面等取得成果,现公开广泛征集年会论文。
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发布时间：2023-12-18 - 摘要：<正>各种（黑色和有色合金）特种铸造方法、各种有色合金（包括新能源材料、高熵合金、金属玻璃等）及复合材料的理论、工艺、设备、测试与控制、计算机应用等方面的科技成果、生产技术和现场经验,以及上述内容的国内外发展动向、行业活动、学术会议消息等。
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发布时间：2023-12-18
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