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摘要：
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大尺寸热模锻工艺中坯料操作放置困难，在模具上的定位精度会强烈影响最终锻件质量及所需设备吨位。为实现在实际模锻过程中，长轴类坯料在复杂模具上的快速便捷的定位过程，以某超长铁道异形件的整体锻造工艺预锻过程中坯料定位为例，从运动学势能分析出发，基于多体动力学分析软件Adams对初始坯料位置姿态偏差下的最终坯料定位偏差进行预测。在正交试验预测结果的基础上，分析了各初始偏差因素对最终坯料定位状态的位置偏差及姿态偏差的影响，并给出了可行的辅助定位方式来提升坯料初始位置的定位精度裕度，最后通过塑性成形过程仿真加以验证。
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The billet is difficult to place in large-scale hot die forging process, and the positioning accuracy in the die strongly influences the final forging quality and the required equipment tonnage. In order to realize the swift and accurate positioning of the long axial billet in complex die, for a special long axial railway irregular part positioning in the pre-forging process of solid forging, based on the analysis of kinematic potential energy, the final positioning deviation of the billet under the deviations of initial position and orientation was predicted by multi-body dynamics software Adams. On the basis of orthogonal simulation results, the influences of each initial deviation factor on the positioning deviation and orientation deviation of the final billet positioning state were analyzed, and the feasible assistant positioning method was obtained to improve the positioning accuracy allowance of the billet initial position, which were finally verified by simulating the plastic deformation process.
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基金项目：
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作者简介：
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作者简介：姜艺林（1993-），男，硕士研究生
E-mail：jyl15@mails.tsinghua.edu.cn
通讯作者：吴任东（1972-），男，博士，副教授
E-mail:wurd@tsinghua.edu.cn
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