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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第5期    总第273期    2017年5月

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文章编号:1672-7207(2017)05-1155-07
基于RSM的铝合金大锻件局部加载成形质量控制
王梦寒1,马鹏程1,周峻峰1,吴道祥1,曾庆华2

(1. 重庆大学 材料科学与工程学院,重庆,400044
2. 西南铝业(集团)有限责任公司 锻造厂,重庆,401326
)

摘 要: 为解决局部加载条件下铝合金大型锻件成形过程中微观组织不均匀与过渡区筋部充填不满的问题,借助于响应面法(RSM)与数值模拟相结合的策略对锻件局部加载成形工艺进行研究。以锻件微观组织均匀性和填充性作为质量评价目标,建立坯料温度、压力机速度、上模斜角角度、道次与质量指标之间的关系模型,并得到合理的工艺参数:坯料温度为440 ℃,压力机速度为10 mm/s,上模斜角角度为158°,3道次成形,各道次压下量分别为20,20和5 mm,将得到的工艺参数进行再模拟并应用于生产试制。对生产试制得到的锻件的典型截面进行组织观察。研究结果表明:模拟和实际生产的锻件微观组织均匀,分布规律一致,且锻件均充填完整,所提出的策略能有效对大型锻件局部加载成形宏、微观质量进行控制。

 

关键词: 铝合金大锻件;局部加载;微观组织;填充性;响应面法

Control of local loading forming quality for aluminum alloy heavy forging based on RSM
WANG Menghan1, MA Pengcheng1, ZHOU Junfeng1, WU Daoxiang1, ZENG Qinghua2

1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
2. Forging Branch, Southwest Aluminum (Group) Co. Ltd., Chongqing 401326, China

Abstract:The strategy of combining response surface method with FEM was proposed to solve the problems under filling and micro-structural uniformity of 7050 aluminum alloy heavy forging, which was formed in the process of local loading. A response surface model was established, with the micro-structural uniformity and filling capacity as its evaluation objectives, and billet temperature, press velocity, angle of up die and parameter for passes were selected as the design variables of that model. Then the reasonable process parameters were obtained: billet temperature, press velocity and angle of up die are 440 ℃, 10 mm/s and 158°, respectively. The number of passes is three, the amount of each pass was 20, 20 and 5 mm. The parameters obtained above were applied in simulation and practical manufacture. The results show that not only the microstructure of forging obtained by simulation and manufacturer is uniform but also the distribution law of microstructure is consistent. The capacity of filling is good too. The quality of the microstructure and macrostructure of heavy forging can be effectively managed by the strategy proposed.

 

Key words: aluminum alloy heavy forging; local loading; microstructure; filing capacity; response surface method

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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