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丁小凤,双远华,王清华,周研,苟毓俊,王军,林伟路.AZ31镁合金无缝管斜轧穿孔新工艺研究[J].稀有金属材料与工程(英文),2018,47(1):357~362.[dingxiaofeng,shuangyuanhua,wangqinghua,zhouyan,gouyujun,wangjun and linweilu.New Technology Research on Rotary Piercing of AZ31 magnesium alloy seamless tube[J].Rare Metal Materials and Engineering,2018,47(1):357~362.]
New Technology Research on Rotary Piercing of AZ31 magnesium alloy seamless tube
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Received:July 04, 2016  Revised:July 17, 2016
Key words: Magnesium alloy seamless tube  Rotary piercing  process  microstructure  
Foundation item:山西省科技攻关计划(项目号20140321008-08)山西省自然基金(镁合金斜轧穿孔基础理论研究,项目号下达中)
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dingxiaofeng,shuangyuanhua,wangqinghua,zhouyan,gouyujun,wangjun and linweilu  
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      In order to solve the problem of difficult processing about magnesium alloy seamless tube, the process prepared by rotary piercing technology for AZ31 magnesium alloy pipe was studied in the paper. According to the constitutive relation of magnesium alloy during hot working, temperature and strain rate range of 300 ℃-450℃, 0.001 s-1 - 1s-1 were confirmed. According to the theory of skew rolling and the existing three-roll skew rolling equipment, the process parameters were preliminary determined. The coupled thermal-mechanical numerical simulation and experiment research of the AZ31B magnesium alloy billet with the size of Φ40mm×300mm were carried, taking samples after rolling for metallographic analysis.The results showed that the rotary piercing way could produce AZ31 magnesium alloy seamless tube; At 400 ℃, choosing appropriate amount of plug advance、feed angle、roll speed, and piercing gorge diameter would be able to pierce Φ40mm×5.5mm×615mm magnesium alloy tube; After piercing microstructure changed into equiaxed distribution and grains were refined to 3 microns, mechanical performance was improved accordingly. This process could be instead of traditional magnesium alloy extrusion process to produce seamless tube, improving production efficiency, reducing costs, which facilitated subsequent product production.