3D打印在铸造技术中应用

介绍了3D打印的基本概念、技术原理及发展历程,对其结合传统铸造技术进行优势互补,所形成的快速铸造工艺进行了总结,并对快速铸造在国内外的发展现状进行了阐述。从快速铸造中的应用分类、工艺流程图和实际案例三个方面对3D打印技术在铸造中的应用进行了总结和分析,阐明了多种快速铸造技术原理、研制经历和若干知名公司的技术特点。最后对3D打印技术的应用发展进行了展望,3D打印技术的发展必将给铸造业带来一场新的技术革命。     

铸造砂型3D打印技术应用及展望

从3D打印技术发展、3D打印相比传统铸造的优势以及3D打印产业链前后端的发展等作了简要的介绍、分析,指出铸造砂型3D打印未来可能的发展趋势,以期能给铸造砂型3D打印技术相关领域未来的发展带来思考.     

砂型3D打印技术在汽车发动机缸体铸造中的应用

近年来,3D打印技术取得了较快的发展,并在各行各业中得到应用。在铸造行业中,3D打印技术的应用越来越广泛。本文结合3D砂型打印技术原理和技术特点,具体介绍了砂型3D打印技术在汽车发动机缸体铸造中的应用。     

注塑模具随形水路零件制造技术进展

3D打印技术的出现,给塑料模具制造带来了新的方式。本文综述了国内外模具随形水路零件制备技术的发展现状,介绍了基于3D打印,结合扩散焊、金属喷涂、CNC、粉末冶金、铸造等技术制备模具随形水路金属零件的方法。指出了3D打印技术提升,3D打印如何与其他制备技术结合,成型塑件冷却智能控制3方面模具随形水路制备技术需要解决的主要问题。     

3D打印快速制造铝合金传动箱箱体

介绍了3D打印技术生产传动箱箱体铸件过程,通过模拟CAD/CAE优化传动箱箱体铸件毛坯结构和铸造工艺,采用3D打印SLS技术制作的铝合金箱体蜡型和石膏型电磁真空增压铸造工艺融合得到满足尺寸和性能要求的合格铸件.     

3D打印在砂型铸造中的应用及发展现状

综述了3D打印在砂型铸造行业的应用及研究现状,对激光选区烧结技术(SLS)和三维粉末粘接技术(3DP)的原理、成形影响因素进行了概括。介绍了3D打印在铸造行业的应用,并简要分析了铸造领域3D打印技术在材料和工艺方面的发展趋势。     

3D技术在艺术铸造领域的应用

结合2015年7月在南京举办的"3D技术在艺术铸造领域的应用"研讨会,介绍了3D打印技术在中国艺术铸造行业的发展状况。指出3D技术将引导中国艺术铸造行业的技术创新和跨越发展,引导中国艺术铸造进入数字化制造的新时代。     

3D打印砂型在铸造中的应用

介绍了3D打印机的工作原理及在砂型铸造中的应用,列举了3D打印技术在工程机械铸件新产品开发、汽车铸件新产品开发及航空复杂铸件上的应用,得出以下结论:(1)采用3D打印铸件砂型,浇注的铸件精度高、披缝少、易清理,新产品开发速度快,适用于新产品开发和复杂件单件小批量的生产;(2)3D打印工艺的设计更改只需要更改三维模型,因而可以快速切换、升级;(3)高端砂型依赖进口设备和原材料,3D打印成本相对较高,是传统铸造的补充,对于普通铸造无法生产的铸件砂型,可以使用3D打印来完成。     

砂型3D打印技术对刹车盘铸造工艺的优化

通过比较喷墨砂型3D打印技术铸造工艺和传统砂型铸造工艺生产风道刹车盘的不同,展示喷墨砂型3D打印技术的优点及对铸造工艺的优化。     

《特种铸造生产实用手册》

正特种铸造涉及的工艺门类较多,本书紧跟当前铸造行业的发展和生产应用实际,全面介绍了各类型特种铸造的生产技术经验和数据,包括熔模精密铸造、壳型铸造、金属型铸造、铁型覆砂铸造、陶瓷型铸造、离心铸造技术及设备、挤压铸造及半固态成形技术、反重力铸造技术、连续铸造技术及装备、增材制造技术及3D打印在新型工业发展的应用等     

铸造3D喷墨打印砂型尺寸精度测量评定方法研究

随着铸造行业的转型发展,3D打印技术已经成熟的应用于制造铸造砂型,所制作的砂型不再单单作为铸造过程中的半成品,而是可以作为产品面向各铸造厂进行销售。但是目前对于砂型的检验标准存在缺失,对于砂型质量的把控和评定缺少依据。针对铸造砂型的尺寸精度,通过设计制作测量试块,给出了一种3D喷墨打印砂型的测量方法及评定标准,填补了目前铸造行业中这一领域在标准上的空白,对推动3D打印技术在铸造行业的应用以及砂型的产品化有着重要的意义。     

The role and impact of 3D printing technologies in casting

3D printing is such a magical technology that it extends into almost every sector relating to manufacturing, not to mention casting production. In this paper, the past, present and future of 3D printing in the foundry sector are profoundly reviewed. 3D printing has the potential to supplement or partially replace the casting method. Today, some castings can be directly printed by metal powders, for example, titanium alloys, nickel alloys and steel parts. Meanwhile, 3D printing has found an unique position in other casting aspects as well, such as printing the wax pattern, ceramic shell, sand core, sand mould, etc. Most importantly, 3D printing is not just a manufacturing method, it will also revolutionize the design of products, assemblies and parts, such as castings,patterns, cores, moulds and shells in casting production. The solid structure of castings and moulds will be redesigned in future into truss or spatially open and skeleton structures. This kind of revolution is just sprouting, but it will bring unimaginable impact on manufacturing including casting production. Nobody doubts the potential of 3D printing technologies in manufacturing, but they do have limitations and drawbacks.     

Additive manufacturing and foundry innovation

Additive manufacturing is expected to transform and upgrade the traditional foundry industry to realize the integrated manufacturing and rapid and low-cost development of high-performance components with complex shapes. The additive manufacturing technology commonly applied in casting mold preparation (fusible molds, sand molds/cores and ceramic cores) mainly includes selective laser sintering (SLS) and binder injection three-dimensional printing (3DP). In this work, the research status of SLS/3DP-casting processes on material preparation, equipment development, process optimization, simulation and application cases in aerospace, automotive and other fields were elaborated. Finally, the developing trends of the additive manufacturing technology in the future of foundry field are introduced, including multi-material sand molds (metal core included), ceramic core-shell integration and die-casting dies with conformal cooling runners.     

Controlled cooling of an aluminum alloy casting based on 3D printed rib reinforced shell mold

3D printing technology has been used for sand molding and core printing, but they simply substitute the traditional molding and core making method without changing the shape or size of the sand mold(core) and their dense structure. In this study, a new type of hollow mold based on 3D printing is presented. The new type of mold is a rib reinforced thickness-varying shell mold. This mold design can realize the controlled cooling of castings, i.e., different cooling rates at different areas, and improve the temperature uniformity of a casting after its solidifi cation. Therefore, the performance of castings can be improved and their residual stress and deformation can be reduced. This kind of new mold was applied to a stress frame of A356 aluminum alloy. The 3D printed rib reinforced thickness-varying shell mold was compared with the traditional dense mold, and the castings obtained by these two kinds of molds were also compared. The experimental results showed that the rib reinforced shell mold increased the cooling rate of the casting by 30%, tensile strength by 17%, yield strength by 11%, elongation by 67%, and decreased its deformation by 43%, while sand consumption was greatly reduced by 90%.     

New sol-gel refractory coatings on chemically-bonded sand cores for foundry applications to improve casting surface quality

Foundry refractory coatings protect bonded sand cores and moulds from producing defective castings during the casting process by providing a barrier between the core and the liquid metal. In this study, new sol-gel refractory coating on phenolic urethane cold box (PUCB) core was examined. The coating density, viscosity, moisture content and wet and dry weight of the coating were evaluated on cores that had been coated at three different dip-coating times. The coating coverage, surface appearance and depth of penetration into the cores were examined with a Stereomicroscope. Gray iron castings were produced with sol-gel coated and uncoated cores and the results were related to the coating properties. The casting results were also compared with castings made with cores coated with commercial alcohol-based and water-based foundry coatings. The analyses show that castings produced with sol-gel coated cores have better surface quality than those from uncoated cores and comparable surface quality with the commercial coatings. Therefore, the new sol-gel coating has a potential application in the foundry industry for improving the surface finish of castings thereby reducing the cost of fettling in the foundry industry since the raw materials and technology are easily affordable.     

铸造旧砂再生回用技术现状及进展

本文对近5年来铸造旧砂再生回用技术研究及应用的进展进行了概述.对目前广泛使用的再生回用技术、设备的研究及应用进行了分析.认为铸造废旧砂的再生回用是铸造工业实现绿色可持续发展的必然要求,低成本高效率地再生回用铸造旧砂是铸造技术进步的重要方向.     

砂再生、颗粒净化的工艺流程设计

备受关注的铸造废旧砂再生处理是一个有工艺特性、相对独立复杂的工艺处理过程。针对中小规模铸造砂处理过程中的旧砂再生,其生产流程可以通过选择干法+热法+干法的综合处理方法,使大量废、旧砂复原、净化转化成优良品质的再生回用砂,或作为商品去替代原、新砂使用。如造型制芯砂、覆膜砂、壳型砂、V法铸造和消失模用砂等不同类型的铸造生产场合。     

铸造旧砂资源化再生技术与创新

中国虽然已是世界铸造＂超级大国＂,但不是铸造强国。我国铸造行业仍然是资源和能源消耗大的行业。在我国,每产1 t铸件,造型和清理排废砂约1.3 t～1.5 t,若不重视铸造旧砂循环再生利用,生产的铸件越多,则对本国和本地区的资源和环境破坏也越大。本文对铸造旧砂的再生循环利用的可行性及工艺设备现状进行了阐述,认为铸造旧砂资源化再生利用是一种节能减排低碳高效的必然趋势。     

GIS铝合金罐体的铸造技术

本文就铝合金罐体的主要铸造方法(即砂型铸造、砂型低压铸造、金属型砂芯低压铸造、金属型低压铸造和V法铸造)所涉及的设备、模具和工艺方面的技术要点进行分析和探讨。     

我国铸造装备的创新、智能、绿色发展之路

从企业数量、装备技术、装备质量、安全措施、装备价格、使用寿命等方面介绍了我国铸造装备的现状,又从熔化、造型、制芯、砂处理、清理、物流、管理、环保、节能等方面介绍了铸造装备的创新、智能、绿色情况,最后提出我国铸造装备的“规、新、专”三字发展之路,希望能对铸造装备行业的发展起到一定的推动作用。