Machine learning methods was applied to combine experimental data with simulation analysis to systemati-cally optimize the temperature,cooling rate,alloy composition,etc.,during investment casting process.By collecting a large amount of casting process data,a prediction model for process parameter based on deep learning was con-structed to optimize the design of process parameters,and the model was validated through on-site experiments.The results indicate that the microstructure and mechanical properties of castings are significantly improved after optimizing casting process by machine learning methods,and the defect rates are reduced,enhancing productivity and economic benefits.In the context of machine learning,the casting quality score of the optimal parameter array is significantly higher than that of suboptimal parameter array in the comparison of parameter groups,and only one group of the opti-mal parameter array gets below 90 points,while the suboptimal parameter groups all get below 90 points.
In this study, near-liquidus squeeze casting AZ91D alloy was used to prepare differential support, and the microstructure and mechanical behavior under different applied pressure were investigated. Under the preset temperature, speed, and other process parameters, the effect of applied pressure on the microstructure and properties of formed parts was analyzed, and relevant mechanism was also discussed. The results showed that the ultimate tensile strength (UTS) and elongation (EL) of differential support can be improved by controlling real-time precision of the forming pressure. The dislocation density in the primary phase increased obviously with the pressure increasing from 80 MPa to 170 MPa, and even tangles appeared. When the applied pressure increased from 80 MPa to 140 MPa, the α-Mg grains were gradually refined, and the microstructure changed from rosette to globular shape. With increasing the applied pressure to 170 MPa, the grain could not be further refined. Similarly, its UTS and EL gradually increased with the applied pressure increasing from 80 MPa to 140 MPa. With increasing to 170 MPa, the UTS tended to be constant, but the EL gradually decreased. In other words, the UTS (229.2 MPa) and EL (3.43%) of the alloy reached the maximum when the applied pressure was 140 MPa, and the comprehensive mechanical properties were the best.
Taking water as a binder to solidify the sand mold,frozen casting is paid attention as a new green cast-ing method.The effects of freezing temperature and composition proportion of frozen casting sand on the strength and air permeability of frozen casting mold were investigated.The mold performance under different water and clay contents,cooling temperatures and sand mesh conditions was explored experimentally,and the mold transi-tion under different pouring temperatures were also systematically carried out.The results indicate that the over-all performance of frozen casting is superior to that of resin mold under the premise of low cost,which is more environmentally friendly with widely application,and possesses positive significance for promoting the goal of carbon peak and carbon neutrality.
伴随互联网的普及,网络经济成为推动社会经济发展的重要驱动力,与此同时,铸造企业营销也面临着新的机遇和挑战.传统的营销模式已经难以适应快速变化的市场环境,因此,铸造企业需要创新营销策略,提升市场竞争力.在网络经济背景下,铸造企业可以通过互联网平台建立线上销售渠道,实现产品的全球化推广.同时,通过大数据分析、人工智能等技术手段,铸造企业可以更好地把握消费者需求,精准定位目标市场,并提供个性化服务,满足消费者的多样化需求.但是,铸造企业在网络经济背景下进行营销创新也面临一些挑战.由于铸造产品的特殊性,传统的销售渠道很难直接转移到互联网平台上,铸造企业需审慎优化营销策略,确保其稳定发展.因此,深入探究网络经济背景下铸造企业的营销创新,对于促进企业的可持续发展具有重要意义,可以为制造业企业在网络经济时代寻找合适的营销路径提供参考.
Al-Cu alloys with different Cu content were fabricated by casting method,and the microstructure,damping properties and storage modulus of Al-Cu alloys were investigated.The results indicate that Al2Cu phase in the Al-3Cu and Al-4Cu alloys is fine and uniformly distributed,while large amounts of massive and stripped Al2Cu phases are distributed in Al-5.7Cu,Al-10Cu,and Al-20Cu alloys.Al-Cu alloys with high copper content exhibit desirable damping performance.The internal friction value of Al-20Cu alloy is 168％and 352.7％higher than that of Al-3Cu and 2024 Al alloy at 350 ℃,respectively.Al2Cu phase hinders the dislocation slip in Al ma-trix,leading to the increase of residual internal stress after deformation,and the increase of storage modulus of Al-Cu alloy with the increase of Cu content.The storage modulus of Al-5.7Cu,Al-10Cu,and Al-20Cu alloys are higher than that of 2024 Al alloy,and the EIF value of Al-20Cu alloy is 230％higher than that of 2024 Al alloy.
Nickel-based alloy is widely used in rapid repair and surface modification of complex structural parts with high performance due to the excellent high temperature resistance and creep resistance.The laser additive nickel-based alloy exhibits desirable hardness and high temperature resistance,which suffers huge loss under harsh service conditions of high temperature and high-speed friction.Therefore,the high temperature wear resist-ance of nickel-based alloy cladding layer needs to be further improved and optimized.The research status of high temperature wear resistance of laser cladding nickel-based alloy was comprehensively described in aspects of the laser cladding process parameters,alloying element content,reinforcing phase,self-lubricating phase and auxilia-ry treatment.The main problems were analyzed and the solutions were proposed.
舞台交互式灯光设计是一种创意和技术相结合的方法,通过使用灯光来与用户、环境或其他元素进行互动,创造出丰富的视觉和情感体验.随着科技的进步,舞台交互式灯光设计所使用的设备和技术也在不断更新和升级.通过使用更为先进的传感器、控制器和编程软件来设计灯光效果,不仅能更好地捕捉演员的动作和情感,并将其转化为灯光效果,还能增强演出的感染力和表现力.除了设计方法外,舞台交互式灯光设计理念也需要不断变革发展,将特种铸造匠心精神融入其中,会进一步优化舞台交互式灯光设计.通过研究特种铸造匠心精神的独特设计风格、精湛技艺和对细节的追求,将其融入舞台交互式灯光设计中,创造出更为生动、真实和引人入胜的视觉效果.
中国传统文化在铸造器物上的应用拥有十分悠久的历史.随着时间的推移,中国的铸造技术不断发展,铸造器物成为重要的文化载体.从汉语言文学角度来看,铸造器物上的纹饰和文字体现了古人对审美的认知,为后人留下了珍贵的文化遗产.主要探讨中国传统文化在铸造器物上的传播与应用,深入探究中国传统文化在铸造器物中的审美表现.同时,从铸造器物中的纹饰和文字入手,揭示古人的思想观念、宗教信仰、政治制度等方面的信息,从而为我们更好地了解中国古代文化提供有力的支撑,也为现代铸造器物的设计提供思路.
The finite element software ProCAST was adopted to numerically simulate the transition between the runner and the support plate with rounded corners of 3,5 and 7 mm of ZTC-4 titanium alloy intermediate casing,respectively.The results indicate that variation of fillet temperature field between different runners and support plate are basically consistent with the results of hot crack tendency.In the stress distribution of shunt ring,the stress field distribution formed by rounded angle value of 5 mm and 7 mm is superior to that of 3 mm.The residu-al stress on the surface of casing was measured by small hole method,and results basically coincide with simula-ted ones,verifying the simulation feasibility.
An Al-2Cu-5Ni alloy only containing a-Al and Al3CuNi phases as equilibrium solidification structure was designed by thermodynamic phase diagram calculation,and effects of cooling rate on microstructure and mechani-cal properties of as-cast Al-2Cu-5Ni alloy were investigated.The results indicate that the grain size is decreased with cooling rate increase.The morphology of Al3 CuNi phase is transformed from fish-bone cluster to particle cluster as the cooling rate increasing from 3.05 ℃/s to 5.58 ℃/s,which is converted to short strip form with cool-ing rate further increasing to 9.08 ℃/s.Meanwhile,the tensile strength and elongation at room temperature reach the maximum value,which is 218 MPa and 16.15％,respectively.The minimum steady-state creep rate is a-chieved at 350 ℃ under the stress of 25 MPa,which is 2.56X 10 5 s-1,and creep mechanism is dislocation climb-ing.The tensile strength,elongation and creep resistance of the alloy are improved by 11％,37％and 96％,respectively,compared with those of the alloy prepared at cooling rate of 3.05 ℃/s.
The mechanical properties of complex thin-walled aluminum alloy castings were strengthened by apply-ing the alternating magnetic field during vacuum counter-pressure casting process.The effects of alternating mag-netic-pressure synergistic field on morphology of eutectic silicon and mechanical properties of ZL114A alloy were systematically analyzed.The results indicate that the alternating magnetic field can effectively break the coarse bulk eutectic silicon and form a fine fibrous structure in the alloy matrix.Meanwhile,the broken silicon phase is further refined due to the squeeze infiltration effects of the pressure field.Thus,the aspect ratio of eutectic silicon is decreased with the increase of the pressure difference.Additionaly,the tensile strength and elongation of the al-loy are increased firstly and then decreased with the increase of the magnetic field strength.However,the tensile strength of the castings is increased with the increase of the stepwise pressurization pressure,while the elongation is increased firstly and then decreased.With magnetic field strength of 24 mT and the pressure difference of 135 kPa,the tensile strength of the casting reaches 302.67 MPa with the elongation of 3.8％.The tensile strength of ZL114A alloy samples treated by the synergistic field reaches the maximum value of 312.31 MPa under the mag-netic at 24 mT with the stepwise pressurization of 160 kPa,which is about 59.31％higher than that of one under the low pressurization of 60 kPa.
Titanium alloy is widely used in modern national defense,aerospace,marine shipping,chemical equip-ment and other fields,due to the characteristics of low density,high specific strength,strong high-temperature oxidation resistance and desirable corrosion resistance,which is an important strategic metal material special in the aerospace industry.With the development of equipment manufacturing,the performance of titanium alloy castings is increased in demand,and the structure of titanium alloy castings tend to be thin-wall,complexity and precision.Therefore,the development of novel rapid casting technology for titanium alloy was focused.The status of traditional sand casting technology and development of novel rapid sand casting technology for titanium alloy based on 3D printing were reviewed,and the corresponding problems and application prospects were proposed.
近日,青海省重大科技专项"高性能镁合金压铸件开发关键技术研究与示范"项目通过专家验收.该项目由青海大学、上海交通大学、重庆大学、青海盐湖股份有限公司、青海海镁特镁业有限公司、青海盐湖镁业有限公司和青海盐湖特立镁有限公司共同承担,解决了原镁纯净度低、压铸镁合金难热处理强化和压铸件致密度低等难题,突破了镁合金压铸件不能在汽车大型薄壁主承重部件使用的"瓶颈"问题.
随着社会的发展,人们审美观念发生巨大变化,对环境艺术设计提出了更高要求.青铜铸件作为一种古老而珍贵的艺术形式,具有丰富的历史文化内涵.在现代环境艺术设计中,青铜铸件的应用较少,主要集中在博物馆和古建筑等传统场所.在人们对于艺术品需求多样化的影响下,对艺术设计的要求越来越高.因此,可尝试将其青铜铸件美术品融入现代环境艺术设计中,探索其在当代艺术领域的表现方式,为传承青铜文化、创新环境艺术设计模式提供保障.深入探讨青铜铸件美术品在现代环境艺术设计中的应用,以期通过将传统与现代相结合,彰显青铜铸件的审美价值,凸显其艺术表现力,同时丰富现代环境艺术设计的思路.
An automobile transmission suspension end cover was analyzed to understand the porosity defects and shrinkage porosity caused by die casting.Firstly,the part requirements were analyzed,then the goting-exhaust-ing system and waterway layout scheme design were carried out to form the initial mold design scheme.The mold design scheme was verified by InteCAST simulation and the actual production,then the causes of porosity defects were analyzed.Finally,by increasing an extrusion pin structure and controlling the cooling water temperature,the porosity defects and shrinkage porosity were successfully eliminated.
Effects of Sc on microstructure and mechanical properties of A356 alloy modified by adding 0.2％～0.3％Sc were investigated.The results indicate that primary α dendrites are significantly refined,and the morphology is transformed from dendritic to short dendrite and spherical granular after Sc addition.Meanwhile,eutectic Si is branched and refined,of which the morphology is converted from needle sheet to fibrous and short rod shape,and further evolved into a granular shape and passivated after heat treatment of 530 ℃ × 6 h+200 ℃ × 7 h.Strengthe-ning phase including Mg2Si and Al3Sc are dispersively precipitated in α-Al matrix,leading to the significant en-hancement of mechanical properties.The tensile strength of the A356 alloy with 0.2％Sc is increased from 213.9 MPa to 292.2 MPa after the heat treatment,and the elongation of the alloy is increased from 5.4％to 7.6％.
High entropy alloy matrix composites were fabricated by spark plasma sintering with Al0.2 CoCrFeNi as matrix and 5％WC as reinforcement.Effects of WC ceramic particles on structure and properties of the composites were investigated by phase composition analysis,microstructure observation,mechanical properties,and tribo-logical properties tests.The results indicate that with the addition of WC ceramic particles,new carbide phases of M6C and M23C6 appears in the composites in addition to the WC and matrix FCC phases.The strength and hard-ness of the composites are increased relative to the matrix,while the fracture strain retains at 43.6％,and the wear rate is reduced by over 50％.
在当代社会,学生学业压力已经成为一个不可忽视的问题,对于铸造专业的学生而言尤其显著.由于铸造专业的课程设置和内容相对繁重,学生在学习过程中面临着成绩、就业、发展等诸多的心理压力,容易产生低落、挫败感等负面情绪,甚至可能出现焦虑、抑郁等心理问题.这种情况对于学生的身心健康以及学业成绩都会产生负面影响.而声乐学习作为一种艺术形式,被很多教育工作者认为具有缓解压力、提高情绪的作用.
电力行业作为国家经济发展的支柱产业,其行业的稳定性和安全性对国家的发展具有重要意义.在电力行业中,铸造产品是一种重要的基础材料,广泛应用于电力设备的制造和维护当中.随着经济的快速发展,电力设备的稳定运行和安全性要求对铸造产品的质量提出了更高的要求.铸造产品作为电力设备制造的基础材料,其质量和性能对电力设备的整体水平有着重要影响.因此,很多电力企业会采取铸造产品供应商合同主体资格审查机制,对供应商的企业资质、生产能力、产品质量、服务水平等方面进行全面、客观、公正的审查和评估,从而筛选出合格的供应商,确保产品质量和安全水平.基于此,通过研究电力行业铸造产品供应商合同主体资格审查模型,旨在减少不良商家和不法行为对电力行业造成的损失和安全隐患.同时,还能推动供应商不断提升技术水平,促进电力行业的技术创新和产业升级.
近日,在上海交通大学医学院附属第九人民医院3D打印创新研究中心,可降解涂层镁合金接骨螺钉启动多中心临床试验,预计将招募超过170名患者,植入体内半年左右进行跟踪随访,符合相关条件后,产品有望在1～2年后上市应用. "我们用外科手术治疗骨折,已经有100多年历史.过去,骨内材料以不锈钢为主,植入人体后会释放有毒离子,与人体长期生物相容性差,不宜在人体内长期使用,两三年后,患者往往要进行第二次手术取出骨钉,这给患者带来很大的痛苦."中国工程院院士、上海交通大学材料科学与工程学院教授丁文江表示,国内自主研发、在人体内可降解的涂层镁合金接骨螺钉已经出现,"这是一个革命性的金属生物材料,可以帮助很多骨折患者避免二次手术."
