|
Abstract：
|
|
Outwall thinning is a main flaw in tube NC bending process,especially for the thin-walled tube with a small bending radius(R/D≤2).Wall thinning of bending section in this forming process was investigated by the method of experiment.The influence laws of forming parameters,such as mandrel balls number,mandrel extension length,bending angle,friction between boost and tube,velocity of pressure die,bending radius and material parameters,were obtained.The results show that increasing the pressure die speed and friction between pressure die and tube suitably are benefit to wall thinning controlling.The deformation characteristic of 1Cr18Ni9Ti tube is different from that of LF2M tube,and LF2M tube is easily to be cracked.
|
|
Funds：
|
|
国家杰出青年科学基金(50225518);;
国家自然科学基金(59975016、50175092);;
高等学校优秀青年教师教学科研奖励计划与高校博士点基金(20020699002);;
航空科学基金(04H53057)资助项目。
|
|
AuthorIntro：
|
|
|
|
Reference：
|
[1]杨合,孙志超,林艳.面向21世纪的先进塑性加工技术与管成形研究发展[A].中国科学协会第二界学术年会文集[C].北京:科学技术出版社,2000.
[2]GU Rui-jie,YANG He,ZHAN Mei,et al.Effect of man-drel on cross section quality of thin-walled tube numerical con-trolled bending[J].Transactions of Nonferrous Metals Soci-ety of China,2005,15(6):1264-1274.
[3]Tang N C.Plastic-deformation analysis in tube bending[J].International Journal of Pressure Vessels and Piping,2000,77:751-759.
[4]武世勇,石伟,刘庄.缠绕式弯管工艺对管壁厚度影响的数值分析[J].锻压技术,2002,27(1):35-38.
[5]陈戟铭.薄壁管数控弯曲成形壁厚变薄的数值分析[D].西安:西北工业大学,2003.
[6]鄂大辛,宁汝新,唐承统,等.小直径管无芯弯曲壁厚变形的试验研究[J].塑性工程学报,2005,12(2):58-60.
[7]王光祥,杨合,李恒,等.工艺参数对薄壁管数控弯管成形质量影响的实验研究[J].机械科学与技术,2005,24(8):995-998.
[9]鄂大辛,宁汝新.壁厚变形对弯管最小相对弯曲半径的影响[J].锻压技术,2006,31(1):90-93.
|
|
Service：
|
|
【This site has not yet opened Download Service】【Add
Favorite】
|
|
|
|
Copyright Forging & Stamping Technology.All rights reserved