合理的主辊转速是保证异形环件顺利轧制的重要因素。基于ABAQUS/Explicit显式算法建立了异形环件轧制过程的三维有限元模型,系统分析了主辊转速对异形环件轧制过程及其热力参数分布的影响规律,并进行了GH4169合金压气机机匣试验验证。结果表明:当主辊转速较大时,环件发生明显的轴向收缩现象;当主辊转速较小时,轴向收缩量不大。随着主辊转速的增加,每转压下量减小,轧制力相应减小,环件温度分布不均匀性增加。因此,对于异形截面环件轧制,在芯辊进给速度相对恒定的情况下,以较低主辊转速为宜。
The rotational speed of the main roll of a profile ring mill is critical for insuring the success of its rolling process. In this paper, a three dimensional finite element model of the profile ring rolling process is built based on the ABAQUS/Explicit algorithm. Using the proposed finite element model, the laws of the main roll rotational speed affecting the rolling process and the thermomechanical parameter distribution are analyzed systematically. A validity experiment is carried out for a compressor case ring of GH4169 alloy. The results show that axial shrinking of the profile ring is clearly observed when the rotational speed of the main roll is relatively high, and that the shrinkage is comparatively small when the rotational speed of the main roll is low. Additionally, with the increase of the rotational speed of the main roll, the thickness reduction per pass decreases, and the corresponding rolling force also decreases, but the inhomogeneity of temperature distribution within the ring increases. Therefore, it could be concluded that a lower rotational speed of the main roll should be adopted for profile ring rolling when the feed speed of the mandrel is constant.
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