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铸态铝合金筒坯与模具接触摩擦是导致筒形件多道次强力热反旋成形不均匀变形的主要因素之一,在很大程度上决定着筒形件旋压过程中鼓包等缺陷的控制与消除。文章基于ABAQUS/Explicit有限元平台建立了该成形过程可靠的三维热力耦合有限元模型,分析了多道次强力热反旋成形中摩擦对鼓包的影响规律和作用机理。结果表明,随着旋轮与毛坯件间摩擦系数的增大,第一道次、第二道次和第三道次筒形件鼓包高度变化程度小,只有微小的减小,第四道次先减小后增大;随着芯模与筒形件间摩擦系数的增大,第一、二、三、四道次鼓包高度先减小后增大。研究结果为铸态铝合金筒形件强力热反旋成形极限中摩擦的选择提供依据。
As-cast aluminum alloy billet and mold contact friction is the result of multi-pass multi-strength hot roller reverse forming non-uniform deformation of one of the main factors, to a large extent determine the cylindrical drum spinning process, and other defects Control and eliminate. Based on the ABAQUS / Explicit finite element platform, a reliable three-dimensional coupled thermo-mechanical finite element model of the forming process was established. The influence of the friction on the blister and the action mechanism were analyzed. The results show that with the increase of the friction coefficient between the roller and the blank, the variation of the height of the drums in the first, the second and the third pass is small with only a slight decrease, while the fourth pass First decrease and then increase; with the increase of the friction coefficient between the mandrel and the cylinder, the first, second, third and fourth times the height of the drum first decreases and then increases. The results provide the basis for the choice of friction in the hot forming of cast aluminum alloy cylindrical parts.