Multi station cold heading process of A286 superalloy twelve point flange bolt
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摘要: A286高温合金十二角法兰面螺栓通常采用热镦成形，但其生产工序繁冗、加工效率低和制造成本高。针对某航天用A286高温合金十二角法兰面螺栓，根据其结构特点，提出一种多工位冷镦成形工艺，利用室温压缩实验，得到A286高温合金的真实应力-应变曲线，并导入到数值模拟软件Deform-3D中，对A286高温合金十二角法兰面螺栓的多工位冷镦成形工艺过程进行了数值模拟，综合分析了各工位的载荷-时间曲线、等效应力场分布、等效应变场分布和损伤值分布，确定了成形工艺参数。最后根据数值模拟结果和成形工艺过程设计相应模具结构，并在多工位冷镦机上进行了工艺试验。试验结果表明，通过合理设计冷镦工艺次数，可以在模具许用应力范围内实现A286高温合金十二角法兰面螺栓的冷镦成形，工艺试验得到的A286高温合金十二角法兰面螺栓锻件充填饱满，和模拟结果一致性较好，对该类零件及其他相似零件的多工位冷镦成形具有一定的指导意义。Abstract: A286 superalloy 12 point flange bolt is usually formed by hot upsetting, but its production process is cumbersome, processing efficiency is low and manufacturing cost is high. In this paper, according to the structural characteristics of an aerospace A286 superalloy twelve corner flange bolt, a multi station cold heading process is proposed. The real stress-strain curve of A286 superalloy is obtained by room temperature compression experiment and imported into the numerical simulation software DEFORM-3D. The multi station cold upsetting process of A286 superalloy twelve corner flange bolt is numerically simulated. The load time curve, equal effect force field distribution, equal effect variable field distribution and damage value distribution of each station are comprehensively analyzed, and the forming process parameters are determined. Finally, according to the numerical simulation results and the forming process, the corresponding die structure is designed, and the process test is carried out on the multi station cold heading machine. The test results show that the cold upsetting forming of A286 superalloy twelve corner flange bolt can be realized within the allowable stress range of the die by reasonably designing the number of cold upsetting processes. The A286 superalloy twelve corner flange bolt forgings obtained from the process test are fully filled and in good agreement with the simulation results. It has certain guiding significance for the multi station cold heading of this kind of parts and other similar parts.
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Key words:
- A286 /
- twelve point flange bolt /
- multi station /
- cold heading forming /
- numerical simulation /
- process test
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表 1 A286高温合金化学成分
(%) 元素 C B V Al Mn 含量 ≤0.08 ≤0.06 ≤0.30 ≤0.30 ≤1.10 元素 Cr Ni Mo Ti Fe 含量 13.5~16.0 24.0~27.0 1.0~1.5 1.9~2.35 余量 
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