大型台阶环件分步轧制成形工艺模拟研究

Simulation Study on Stepwise Rolling Forming Process of Large Step Rings

大型环锻件作为风电、航空航天等领域的关键零部件,其制备质量和效率已成为行业发展的重要因素。针对台阶环件的精准轧制问题,采用热模拟试验与数值模拟相结合的方法,研究了Q345E钢不同工艺参数下的热变形行为,分析了不同轧制方式下金属的流动规律。结果表明:当变形温度在1100℃以上时,应力-应变曲线呈现出动态再结晶特征。同时,确定了最优变形工艺参数,即温度在1050~1250℃之间,应变速率在0.1~1 s^(-1)之间。特别地,针对大型内台阶环件的成形,提出了矩形毛坯逐步产生轴向壁厚差的分步轧制新方法。

As a key component in wind power,aerospace and other fields,the preparation quality and efficiency of the large ring forgings have become important factors in the industry's development.To address the precise rolling of step rings,in this paper,a combined method of thermal simulation experiments and numerical simulations is adopted to study the thermal deformation behavior of Q345E steel with different process parameters,and analyze the flow laws of metals with different rolling methods.The results indicate that the stress-strain curve exhibits dynamic recrystallization characteristics when the deformation temperature exceeds 1100℃.The optimal deformation process parameters are found to be a temperature range of 1050~1250℃and a strain rate of 0.1~1 s^(-1).Especially,aiming at the forming of large inner step rings,a new stepwise rolling method is proposed to gradually generate axial wall thickness difference in rectangular billets.