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利用Gleeble-3500D热模拟实验机对Q345E钢进行单道次热压缩实验,建立起环件用钢的流变应力模型,在有限元模拟软件SIMUFACT中建立起大型锻坯内台阶环件双件轧制三维数值仿真模型,对大型内台阶环件一个生产周期内的环件轧制过程进行了数值模拟,并对其可靠性进行了实验验证,研究了环件热轧过程中环件不同部位的等效应变场、温度场、辗扩力以及金属流动特性的规律。结果表明:轧制过程中环件的应变分布规律为,驱动辊、芯辊与环件台阶高度的应变、环件的棱角区的应变要明显大于环件其他部位的应变,且越靠近这些部位的应变越大,反映出整个环件轧制过程中变形区由成形辊与环件接触面部位和棱角处向环件内部逐渐扩展;环件的高温区域越来越来窄,且向环件内部集中,环件内部的温度要远远高于驱动辊和芯辊与环件接触部位的温度;轧制力与轧制力矩的变化规律为先增大后保持在一定范围内波动,最后逐渐下降。
The single-pass hot compression test of Q345E steel was carried out by using Gleeble-3500D thermal simulation machine to establish the flow stress model of steel for ring part. In the finite element simulation software SIMUFACT, The three-dimensional numerical simulation model is used to simulate the ring rolling process within a production cycle of a large inner step ring. The reliability of the ring rolling process is experimentally verified. The effects of different ring parts on the ring rolling process Effect variable field, temperature field, rolling force and the law of metal flow characteristics. The results show that the strain distribution of the ring during the rolling process is the strain of the step height of the driving roller, the core roller and the ring. The strain in the angular zone of the ring is obviously greater than that of the other parts of the ring. The larger the strain, the deformation zone in the whole ring rolling process is gradually expanded from the contact part of the forming roll and the ring part to the inner part of the ring part. The high temperature region of the ring part is more and more narrow and narrow, The temperature inside the ring is much higher than the temperature at the contact point between the driving roller and the core roller and the ring. The rolling force and the rolling torque change first to increase and then keep fluctuating within a certain range, and then gradually decrease .