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镁合金是目前最轻的结构材料,在汽车、电子等诸多领域的应用日益增加。本文介绍了铸造镁舍金的性能及强化方法、镁合金熔炼的阻燃、镁合金的铸造成形技术和铸造缺陷及改进方法。 相似文献
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Development of magnesium die casting alloys is the art of combining a thorough understanding of thermodynamic aspects of alloy composition and phase formation with the solidification kinetics as experienced in the die casting process. The microstructures obtained will determine The Alloy Property profile, which must be in line with the targeted application requirements. Successful development of an industrial alloy means that also The Diecasting Performance profile as well as the Alloy Production and Recycling profile must be fulfilled. In the present paper, a summary of current alloy development efforts will be given. Results from alloy development work by Hydro Magnesium will be presented, focusing mainly on creep resistant alloys. Specifically, alloys within the Mg‐Al‐RE system are highlighted. 相似文献
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Influences of Casting Pressure Conditions on the Quality and Properties of a Magnesium Cylinder Head Cover Die Casting 总被引:1,自引:0,他引:1
Casting pressure conditions have great influences on the casting defects, such as gas porosity, shrinkage porosity and gas holes. A Mg cylinder head cover die casting was used to experimentally study the influences of casting pressure, the loading time and the piston position of pressure intensification on the variation of pressure and the quality of casting. The results show that casting pressure, the loading time and the piston position of pressure intensification have great influences on the pressure variations in the mold, the quality and performance of casting. The external quality, the density and the tensile strength of casting were improved with the increase of casting pressure and the piston position of pressure intensification and the decrease of the loading time of pressure intensification. 相似文献
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目的采用铝合金代替传统塑料风扇叶片,适应节能减排、绿色铸造发展的趋势。方法采用UG建模和Anycasting软件,对铝合金风扇叶片的压铸模具进行设计,包括分型面设计、型芯型腔结构设计、浇注系统设计、溢流槽设计、排气系统设计、推出机构设计、冷却系统设计等,并对其压铸成形过程进行了数值模拟。结果风扇扇叶部分最后凝固且容易产生缩松和气孔,将溢流槽向扇叶方向移动,收集扇叶和扇叶之间的气体和夹杂,加强对缺陷处的排气,缺陷基本消失。结论设计的压铸模具满足铝合金风扇叶片的生产要求,符合节能减排、绿色铸造发展的趋势。 相似文献
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目的 保证铸旋车轮短流程制造工艺的实现,提高旋压模具与同一轮型不同铸造毛坯的配合能力,防止因旋压后毛坯尺寸变化过大,造成车轮机加成品率下降的现象。方法 以某款车轮旋压模具为研究对象,对其旋压模具结构进行重新设计,增加定位滑块、垫板等设计,提高毛坯与模具的定位与配合,增强模具对毛坯的自适应性。结果 对改进后的旋压模具进行试验验证,新结构的旋压模具能够满足不同铸造毛坯的旋压,且控制上模压力在4.5 MPa内,毛坯尺寸合格,性能无影响。结论 该旋压模具设计的方法已经应用到了其他铸旋车轮的设计中。 相似文献
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镁合金消失模铸件表面膜成分及其结构 总被引:2,自引:0,他引:2
采用X射线光电子能谱技术(XPS)对消失模镁合金铸件的表面成分进行了测定,结果表明消失模镁合金铸件表面元素成分为Mg、Al、C、O、Si;结合对镁合金液和消失模样界面间的化学反应分析,揭示了消失模镁合金铸件表面是由MgO、Al2O3、SiO2和无定型C等组成的一层薄膜,即消失模镁合金铸件表面的Al2O3-SiO2-MgO-C复合膜;该复合膜对提高镁合金表面的防腐蚀性有很好的作用;提出了镁合金消失模表面膜的结构模型.这些结果表明,消失模技术作为镁合金零件的成形方法具有独特的优势. 相似文献
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Optimization of Processing Parameters During Laser Cladding of ZE41A-T5 Magnesium Alloy Castings Using Taguchi Method 总被引:1,自引:0,他引:1
X. Cao M. Xiao M. Jahazi J. Fournier M. Alain 《Materials and Manufacturing Processes》2008,23(4):413-418
A continuous wave 4 kW Nd:YAG laser welding system was employed to clad single beads on machined 6.2-mm thick ZE41A-T5 aerospace magnesium alloy sand castings using nominal 1.6-mm filler rods of the parent metal. Based on the quality criterion of minimum dilution ratio, the Taguchi experimental method was used to optimize different process parameters and to identify the dominating factors. It was found that, for the process window investigated in this work, the optimal levels were 5.0 m/min for wire feed rate, 2.25 kW for laser power, and 2.5 m/min for cladding speed, with a minimum dilution ratio of 0.155. With 95% confidence, the wire feed rate is the dominating factor with the most significant influence on the dilution ratio. The dilution ratio usually decreases with increased wire feed rate while it increases with increased laser power. By contrast, the cladding speed appears to have insignificant influence on the dilution ratio over the cladding speed range used in this study. 相似文献
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In this paper, the selection of welding process parameters for obtaining the optimum weld butt-joint ultimate tensile strength (UTS) of aluminum alloy (6061-T6) is presented. Considering weld-joint UTS as the quality characteristic in the selection of process parameters, the Taguchi method is used to analyze the effect of each individual process parameter and of their interaction and then to determine process parameters for the optimum weld-joint UTS. Analysis of variance (ANOVA) technique is applied to investigate which welding process parameter has significant effect on the weld-joint UTS. Experimental results are provided to illustrate the proposed approach. 相似文献
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《Materials and Manufacturing Processes》2012,27(8):779-782
In this paper, the selection of welding process parameters for obtaining the optimum weld butt-joint ultimate tensile strength (UTS) of aluminum alloy (6061-T6) is presented. Considering weld-joint UTS as the quality characteristic in the selection of process parameters, the Taguchi method is used to analyze the effect of each individual process parameter and of their interaction and then to determine process parameters for the optimum weld-joint UTS. Analysis of variance (ANOVA) technique is applied to investigate which welding process parameter has significant effect on the weld-joint UTS. Experimental results are provided to illustrate the proposed approach. 相似文献
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目的 对钛合金阀体件“一模多件”铸造工艺进行优化研究,达到降低成本、保证铸件产品质量的目的。方法 以ZTA2钛合金阀体件为研究对象,基于零件壁厚范围较宽的结构特点、零件的技术要求与生产实际现状,结合经验分析及数值模拟仿真技术进行铸造工艺设计。结果 确定分型面和浇冒口的设计,在热节点及孤立液相区域设置补缩冒口,通过数值模拟对铸件模拟结果的缩孔缩松情况进行分析,优化冒口的设计,增加补缩通道,最终确定合理的“一模多件”开放式浇注系统。对于“一模多件”铸造工艺,通过合理设计浇注系统,可以有效保证浇注过程中各层铸件的平稳浇注。浇注系统宜采用开放式的浇注系统,直浇道、横浇道、内浇口的截面积比例为1∶2∶4。结论 采用机加工石墨型铸造,在真空凝壳炉完成熔炼,在浇注温度为1 770 ℃、模壳预热温度为200 ℃的情况下,采用重力浇注的形式在真空凝壳炉中铸造生产出钛合金阀体件,所获得的铸件无铸造缺陷,其成分和力学性能均满足质量要求。研究结果表明,在铸造过程中使用数值模拟技术可以优化铸造工艺设计,缩短产品试制周期,大大提高生产效率。 相似文献
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The purpose of this paper is to provide a succinct but nevertheless complete mechanistic overview of the various types of magnesium corrosion. The understanding of the corrosion processes of magnesium alloys builds upon our understanding of the corrosion of pure magnesium. This provides an understanding of the types of corrosion exhibited by magnesium alloys, and also of the environmental factors of most importance. This deep understanding is required as a foundation if we are to produce magnesium alloys much more resistant to corrosion than the present alloys. Much has already been achieved, but there is vast scope for improvement. This present analysis can provide a foundation and a theoretical framework for further, much needed research. There is still vast scope both for better fundamental understanding of corrosion processes, engineering usage of magnesium, and also on the corrosion protection of magnesium alloys in service. 相似文献
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在不同温度下对压铸AM60B母材进行焊前热处理,待冷至室温后对其实施不填丝GTAW重熔焊接。焊后用扫描电镜对焊缝截面的气孔分布及形貌进行观察,并用粒径分析软件Nano measurer 1.2测量焊缝中气孔尺寸,用基于Matlab二次开发的图像分析程序识别和计算焊缝气孔率。结果表明:焊缝气孔主要分布在焊缝熔融区及熔合线附近;与未经焊前热处理母材对应的焊缝相比,经焊前热处理后所得焊缝中的气孔率及气孔尺寸均降低;随着焊前热处理温度升高,焊后气孔率及气孔尺寸均逐渐增加。 相似文献
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