TA24钛合金三辊斜轧穿孔及连轧有限元模拟

Finite Element Simulation of Three-Roll Skew Rolling Piercing and Continuous Rolling of TA24 Titanium Alloy

  • 摘要: TA24钛合金是中国钛合金材料标准体系中典型的近α型钛合金,具有比强度高、耐高温、易加工等优势。采用斜轧穿孔+连轧工艺生产钛合金无缝管,其轧制效率和材料利用率高,在高端装备制造领域有着不可替代的地位。本研究以TA24钛合金管材为研究对象,通过有限元模拟,分析顶伸量和轧辊转速对斜轧穿孔及连轧过程中的轧制力和应力、应变分布情况的影响。研究发现:适当增大顶伸量能有效降低斜轧穿孔过程中轧辊的轧制力,延长顶头寿命,并有效提高管坯成形质量;适当增大轧辊转速能提高轧制效率和应力分布均匀程度;连轧模拟过程中,随着连轧道次的增加,各道次轧辊的最大轧制力呈现先增大后减小的变化趋势,在第二道次轧制时轧制力最大。第六道次轧制后管材的壁厚和外径与目标值偏差分别为0.61%和0.90%,轧制力和顶头轴向力模拟值与计算值的误差分别为4.30%和3.11%。结果表明该有限元模型可以准确预测TA24钛合金轧制过程中的各物理量演变规律,为实际生产提供明确指导。

     

    Abstract: TA24 titanium alloy represents a typical near-alpha titanium alloy within China’s titanium alloy material standards system, offering advantages such as high-temperature resistance, high specific strength, and ease of machining. The oblique rolling piercing combined with continuous rolling process yields high rolling efficiency and material utilization for producing seamless titanium alloy tubes, securing an irreplaceable position within the high-end equipment manufacturing sector. In this study, with the TA24 titanium alloy as the object and by the method of finite element simulation, the effects of varying top extensions and roll speeds on the oblique rolling and piercing process, and the distribution of rolling forces and stress-strain states during continuous rolling are investigated. Findings indicate that increasing the top extension within appropriate limits can effectively reduce both the rolling force on the rollers during oblique rolling piercing, thereby extending mandrel service life. Similarly, raising roller speed within suitable ranges can enhance rolling efficiency and improves stress uniformity. During the continuous rolling simulation, with the increasing of rolling pass, the maximum rolling force across all passes increases first and then decreases, that of the second pass to the highest. The numerical simulation calculation deviations of the rolling force and mandrel axial force are 4.51% and 3.26%, respectively. After the sixth rolling pass, the wall thickness and outer diameter calculation deviations of the pipe are 0.61% and 0.90%, respectively. This demonstrates that the simulation process can predict the evolution patterns of various physical quantities during the rolling process of TA24 titanium alloy with high precision, providing clear guidance for actual production.

     

/

返回文章
返回