Numerical Study on Motions of Rolls in Hot Rolling of Titanium Alloy Large Rings

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• 作者：Wang Min^a ; ^b ; ^{sprit418@mail.nwpu.edu.cn} ; Yang He^b ; Guo Lianggang^b
• 关键词：hot ring rolling ; titanium alloy ; large ring ; motions of rolls ; numerical simulation
• 刊名：Rare Metal Materials and Engineering
• 出版年：2012
• 期刊代码：P57_18755372
• 类别：et
• 出版时间：January, 2012
• 卷：41
• 期：1
• 页码：14-18
• 文件大小：360 K

摘要

Titanium alloy is sensitive to strain rate, so motions of rolls are crucial to the hot rolling process of titanium alloy large rings. In the study, firstly, the relative velocity v_r was proposed to synthesize motion parameters of rolls, including the rotational velocity of the driver roll n₁ and the feed rate of the idle roll v, and then the reasonable range of v_r was determined analytically based on the stable forming condition. Secondly, a reliably coupled thermo-mechanical 3D-FE model of the process was developed in the dynamic explicit code ABAQUS/Explicit. Finally, the effect of v_r on the process was studied using FE simulation. The results obtained show that although increasing v_r by two different ways, i.e., by decreasing n₁ or by increasing v, makes the feed amount per revolution 螖h_i increase, not all of their effects on the process are in agreement, such as for the nonuniformity of strain distribution. An appropriately larger value of v_r is helpful to improve the end-plane quality and make strain and temperature distributions in a deformed ring more uniform, but has an adverse influence on the roll force.