核电乏燃料元件烧结用钼镧舟皿的热冲压工艺研究
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摘要
为了研究核电乏燃料元件烧结用钼镧舟皿中波纹压型的成形工艺,降低生产试制成本,本文采用整体成形法和分步成形法两种方法对其成形工艺进行研究。基于DEFOEM-3D软件,对钼镧板材的两种热冲压工艺进行数值分析,获得的结论如下:通过整体成形法获得钼镧舟皿底部波纹压型的整体成形力为8760kN,侧面波纹压型整体成形力为3940kN。整体成形法可一次性实现钼镧舟皿底部和侧面波纹压型的成形,具有效率高的特点,但是底部波纹压型的成形力大于目前设备的能力。分步成形法与整体成形法相比,第一个波纹压型的成形力为958kN,其余波纹压型的成形力为672kN。该成形工艺具有成形力小的优点,可在6300kN的液压机上实现波纹压型的成形,由于其在成形过程中当板材温度低于终锻温度,需要对板材进行重新加热,且在成形过程中存在板材和上模具的相对运动,成形过程相比较为复杂。因此可通过整体成形法成形侧壁波纹压型,采用分步成形法实现底部波纹压型。
In order to study the corrugated molding process of Mo- La alloy sheet used in the spent fuel of nuclear powerand reduce the cost of production,two methods including the whole forming method and fractional step forming method have been adopted in the text.The numerical analysis has been conducted to two kinds of hot stamping process on the basis of DEFOEM-3D software.It is concluded that the forming force of the corrugated molding in the bottom and lateral wall are separately 8760 kN and 3940 kN in the whole forming process.The bottom and lateral forming can be completed in one time with high efficiency by use of whole forming process,but by which the bottom forming force is higher than the capacity of the current equipment.Comparing with the whole forming method,the fractional step forming method has the advantage of smaller forming force.The forming force of the first corrugated molding is 958 kN and the forming force of the others corrugated molding is 672 kN.The corrugated molding can be conducted in the 6300 kN hydraulic press.The Mo- La alloy sheet has been requested to be heated when the temperature is lower than the final forging temperature during forming process.Besides,the relative movement between sheet and top tool also makes the forming process more complex.Therefore,the corrugated molding in the side wall could be formed by use of the whole forming process while the corrugated molding in the bottom could be realized by the fractional step forming method.
In order to study the corrugated molding process of Mo- La alloy sheet used in the spent fuel of nuclear powerand reduce the cost of production,two methods including the whole forming method and fractional step forming method have been adopted in the text.The numerical analysis has been conducted to two kinds of hot stamping process on the basis of DEFOEM-3D software.It is concluded that the forming force of the corrugated molding in the bottom and lateral wall are separately 8760 kN and 3940 kN in the whole forming process.The bottom and lateral forming can be completed in one time with high efficiency by use of whole forming process,but by which the bottom forming force is higher than the capacity of the current equipment.Comparing with the whole forming method,the fractional step forming method has the advantage of smaller forming force.The forming force of the first corrugated molding is 958 kN and the forming force of the others corrugated molding is 672 kN.The corrugated molding can be conducted in the 6300 kN hydraulic press.The Mo- La alloy sheet has been requested to be heated when the temperature is lower than the final forging temperature during forming process.Besides,the relative movement between sheet and top tool also makes the forming process more complex.Therefore,the corrugated molding in the side wall could be formed by use of the whole forming process while the corrugated molding in the bottom could be realized by the fractional step forming method.
引文
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[3]刘俊怀,李晶.不同掺杂试剂的钼镧板材力学性能分析[J].中国钼业,2013,37(3):55-57.
[4]傅蔡安,郝健,彭广盼,等.基于Deform的钼板轧制用轧辊辊形的研究[J].锻压技术,2011,36(3):50-54.
[5]王锦,安耿,刘仁智.热加工方式及总变形量对厚钼板退火组织的影响[J].中国钼业,2012,36(2):52-55.
[6]王新刚,韩强,赵宝华.稀土高温钼板室温塑韧性研究[J].稀有金属,2003,27(1):80-82.
[7]王锦,李晶,武洲.钼板热拉深成形研究[J].中国钼业,2013,37(4):53-55.
[8]韩晓兰,范淑琴,赵升吨,等.离心风机叶轮盖盘热锻有限元分析[J].锻压装备与制造技术,2012,47(2):60-64.
[9]王玉文,张大伟,朱成成.机油滤清器法兰冲压成形过程有限元建模及模拟[J].锻压装备与制造技术,2015,50(3):81-84.
[10]陈程,尹海清,曲选辉,等.钼塑性变形抗力数学模型的研究[J].塑性工程学报,2007,14(2):7-10.
[11]张威.纯钼及钼镧合金轧制工艺及组织性能研究[D].沈阳:东北大学,2014.