FE Simulation for Internal Inversion of Aluminium Alloy Tube

1 Introduction A double-walled invertube is difficult to fabricate other than applying inversion process. Such kind of invertube can be used as impact energy absorbing element in transport vehicles, like aircrafts and automobiles. Reddy T Y[1] did the analysis of Internal inversion and calculated the inversion load. Reid[2] et al. examined nosing and internal inversion of cold drawn steel tube by the finite element package ABAQUS. Recently, Rosa P A[3] et al. investigated Internal invers…     

“2007年度现代锻造装备技术研讨会”即将在青岛召开

为满足我国锻造行业急需解决在装备的制造、选型、管理、使用、维修等方面存在的一些问题的需求，中国锻压协会将在2007年6月24-28日在山东青岛地区召开“2007现代锻造装备技术研讨会”。本次研讨会的主题是“倡导绿色、高效、节能，提升我国锻造装备技术水平”。     

Isothermal Gas Forming of Mg Alloy AZ31 Sheet

There have been reports on sheet forming of Mg alloy in industry via the punch and die method;this paper is probably the first formal one for studying the sheet formability of AZ31 employing pressurized gas to press the sheet into a female die cavity at various elevated temperatures.The results indicate it is feasible to form a rectangular box via pressurized gas from extruded sheets of 0.5 and 1.7 mm thick.The formed box has 1:2 depth over width ratio,which should be large enough when dealing with realistic industrial sheet forming parts.Presently,forming a sheet of 0.5 mm thick is considered a technical challenge by industry,and it is conquered as demonstrated in this paper.Gas forming technique applied to Mg alloy is unprecedented and shows potential for industrial utilization.     

通过对变形过程的理论分析进一步提高大型自由锻锻件的质量

<正> 一、概述锻造大型钢锭时,为了使空隙闭合,重要的是要有足够大的变形程度.因此,希望能预先计算出空隙的闭合条件.镦粗有缩管的钢锭用数学来描述,其基本想法已经有过论述.因此本文,仅针对三个计算量不同的以上限法为依据的模型,用一个例子进行讨论,并计算为闭合空隙所必需的最小锻造比.     

AlF3/N2/空气气氛中密封熔炼镁试验研究

在预先装入固态AlF3的密封熔炼炉中,研究了熔炼温度和炉内空气量对金属镁保护效果的影响,并对表面膜形貌、成分和成分分布进行了研究。研究结果表明,试验温度(≤800℃)下,熔炼温度和气氛中空气含量不影响金属镁的保护效果,金属镁很好被保护,熔炼温度和气氛中空气含量对表面膜成分和成分分布也没有明显影响;表面膜由MgF2区和MgF2 Al混合区域构成;所有表面膜致密,胞团直径小于0.5μm。固态AlF3在熔炼温度下蒸汽压高,汽化产物与金属镁反应生成MgF2和金属铝。     

中心楔块精锻工艺及数值模拟

在分析中心楔块锻造工艺的基础上，结合成形过程的数值模拟，优化精锻模具和工艺参数，解决了锻件表面质量和尺寸精度要求高的难点，成功开发出中心楔块精锻成形生产工艺。     

镁合金的应用现状及其塑性成形技术

通过对镁合金应用现状及其塑性成形方式的研究，分析了镁合金的应用前景及塑性变形特点，阐述了镁合金塑性加工研究现状，提出了塑性成形是镁合金产品的成形的发展方向．综述了镁合金在汽车工业、电子工业以及航空航天工业上的应用及其塑性成形技术的发展．