文章摘要
董媛媛,张存生,赵国群,孙文超,等.7×××系空心铝型材挤压横向焊缝的研究[J].精密成形工程,2017,9(5):98-103.
7×××系空心铝型材挤压横向焊缝的研究
Transverse Welds of 7××× Hollow Aluminium Alloy Profile
投稿时间:2017-08-15  最后修改时间:2017-09-10
DOI:10.3969/j.issn.1674-6457.2017.05.013
中文关键词: 7×××系空心铝型材  挤压  横向焊缝
英文关键词: 7 ××× hollow aluminium alloy profile  extrusion  transverse weld
基金项目:
作者单位
董媛媛 山东大学材料液固结构演变与加工教育部重点实验室济南 250061 
张存生 山东大学材料液固结构演变与加工教育部重点实验室济南 250061 
赵国群 山东大学材料液固结构演变与加工教育部重点实验室济南 250061 
孙文超 龙口市丛林铝材有限公司山东 烟台 265705 
摘要点击次数: 163
全文下载次数: 148
中文摘要:
      目前高速列车的承载结构主要采用7×××系铝合金挤压型材。在铝型材连续挤压生产过程中,2根相邻挤压坯料间的界面会在型材内部形成横向焊缝,而横向焊缝将导致型材性能下降,需要对包含横向焊缝区域的型材进行切除,显著降低了产品的成品率。由于7×××系铝合金硬度较高,材料流动性能较差,所以型材中横向焊缝的延伸长度会大大增加,特别是空心型材中横向焊缝延伸长度增加更为明显,严重影响了产品成品率,因此,开展对7×××系空心铝型材挤压横向焊缝的相关研究具有非常重要的工程意义。回顾了国内外挤压横向焊缝的研究现状,指出了目前该方面研究尚存在的问题,并提出了今后的发展方向。针对7×××系空心铝型材挤压横向焊缝研究中存在的问题,系统研究了空心铝型材横向焊缝的宏观形貌、微观组织等,揭示了挤压工艺参数和模具结构参数对横向焊缝延伸长度的影响规律。结果表明,适当减小挤压比以及增大挤压速度可以有效减小横向焊缝延伸长度,但挤压温度对横向焊缝长度的影响并不明显。
英文摘要:
      Currently, 7××× aluminum alloy extrusion profiles are widely used in manufacturing bearing structure of high-speed train. During continuous production of aluminum alloy profiles, the interface of two adjacent billets forms transverse weld in the profile. The region including transverse welds must be discarded, so it has great influence on the finished product rate of extrusion production. Due to the high rigidity of 7××× aluminum alloy and low flowing property of material, the length of transverse weld is increased apparently, especially for AA7××× hollow profile, which leads to low finished product rate. Therefore, it is necessary to investigate the evolution of transverse weld for 7××× hollow profile. The current research of transverse weld for hollow profile in literature was reviewed firstly, and the existing problems were pointed out and future development direction was put forward. To solve the problems existing in research of transverse welds of hollow aluminum profiles, the macroscopic morphology and microstructure of the transverse welds of the hollow aluminum profiles were studied in this paper and the influences of extrusion process parameters and die structure parameters on the length of transverse welds were revealed. The reduction of the extrusion ratio and the increase of the extrusion speed can effectively reduce the transverse weld extension length, but the effect of the extrusion temperature on the transverse weld length is not obvious.
查看全文   查看/发表评论  下载PDF阅读器
关闭

关于我们 | 联系我们 | 投诉建议 | 隐私保护 | 用户协议

您是第1671170位访问者    渝ICP备10003521号-6

>版权所有:《精密成形工程》编辑部 2014 All Rights Reserved

>邮编:400039 电话:023-68792294传真:02368792396 Email: jmcxgc@163.com

>    

渝公网安备 50010702501719号