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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第8期    总第264期    2016年8月

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文章编号:1672-7207(2016)08-2643-07
冲压速度对铝合金5182-O拉深性能的影响
居龙1, 2,毛婷婷2,李洪波1,张杰1

(1. 北京科技大学 机械工程学院,北京 100083;
2. 美国俄亥俄州立大学 精密成形中心,哥伦布,43210
)

摘 要: 成形速度不仅关系到生产效率,且对成形质量具有重要的影响。伺服驱动压力机可实现滑块任意运动模式调节与控制,为多样化冲压过程提供可能性。采用传统机械式和恒速成形式2种滑块运动模式,基于Pamstamp有限元仿真确定了板料尺寸、压边力和拉深深度,利用伺服压力机对汽车通用铝合金材料5182-O进行常温下不同速度下的拉深试验。试验结果表明:随着冲压速度增加,拉深件关键圆角区域颈缩及破裂趋势减小,并且冲压力相比于低速成形时减小量可达8.9%。从材料力学属性及润滑状态2个方面进行进一步的分析与讨论,结合有限元计算,对比分析不同冲压速度下所选截面处板料相对于模具的滑动速度,指出局部区域润滑状态的动态变化成为冲压速度影响拉深成形质量的关键因素。

 

关键词: 铝合金;拉深试验;成形速度;拉深性能

Effects of forming speed on drawability of aluminum alloy 5182-O
JU Long1, 2, MAO Tingting2, LI Hongbo1, ZHANG Jie1

1. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Center for Precision Forming, the Ohio State University, Columbus 43210, USA

Abstract:Forming speed is significantly related to parts quality and productivity in automotive industry. Servo presses have the capability to enable flexible ram motions for various stamping operations. Deep drawing tests were conducted on a servo press to investigate the effects of forming speed on the drawability for Al alloy (5182-O) sheets at room temperature. The slide movements used in the tests were basic mechanical ram motion and constant during forming. Blank size, blank holder force and draw depth were determined by finite element simulation with commercial software Pamstamp. The results show that the tendency of necking and fracture in critical corners reduces with high drawing speed, and the decrease of forming force is up to 8.9% compared with low speed forming. Comprehensive discussions from the point view of mechanical properties and lubrication status are carried out. By comparing the calculated sliding speed between sheet and dies along selected section at different forming velocities, the dynamic characteristic of local lubrication is pointed out to be the main reason for the effects of forming speed on drawability.

 

Key words: aluminum alloys; deep drawing test; forming speed; drawability

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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