19英寸TBM盘形滚刀刀圈模锻成形研究

Study on die forging for 19-inch TBM disc hob ring

为了研究19英寸TBM盘形滚刀刀圈模锻成形过程的变化规律,采用DEFORM有限元分析软件,分析了在始锻温度为1150℃、成形速度为25 mm·s^(-1)的成形条件下盘形滚刀刀圈模锻成形过程中成形载荷、刀圈形状、金属流线等的变化情况。结果表明:滚刀刀圈模锻成形过程由模锻初期、模锻中期、模锻后期3个阶段构成;金属坯料对于模具的填充过程上下并不对称,上模和下模型腔的填充速度不同,上模型腔先于下模型腔被填满;模锻成形过程中刀圈的整体温度均有所降低,其中,刀刃处的温度下降最少,较始锻温度下降了7.8%,刀圈圆弧过渡区的温度下降最多,较始锻温度下降了34.78%;刀圈应力由内向外逐步增大,其中刀刃处的等效应力最大,较平均等效应力高13.54%。

In order to study the change laws of die forging process for 19-inch TBM disc hob ring, the changes of forming load, hob ring shape and metal streamline in the die forging process for disc hob ring under the forming conditions of initial forging temperature of 1150 ℃ and forming speed of 25 mm·s^(-1)were analyzed by finite element analysis software DEFORM. The results show that the die forging process of hob ring is composed of three stages: initial stage, middle stage and final stage. The metal blank does not fill the mold symmetrically up and down, the filling speeds of upper and lower mold cavities are different, and the upper mold cavity is filled before the lower mold cavity. During the die forging process, the overall temperature of hob ring decreases. And the temperature at blade decreases the least by 7.8% compared with the initial forging temperature. However, the temperature at arc transition zone of hob ring decreases the most by 34.78% compared with the initial forging temperature. Furthermore, the stress of hob ring increases gradually from inside to outside, and the equivalent stress at blade is the largest, which is 13.54% higher than average equivalent stress.