Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第z1期    总第1期    2013年12月

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文章编号:1004-0609(2013)S1-0226-05
金属弯头扩径推弯成形的金属流变特性
陈 军,杨英丽,杨海瑛,王廷询,段文森

(西北有色金属研究院,西安 710016)

摘 要: 介绍扩径推弯弯头的成形原理和成形过程中金属流变规律。弯头管坯金属在环向扩径力与轴向推制力作用下,发生轴向压缩和环向扩径的复合变形。轴向压缩使管坯发生弯曲变形,在羊角芯头的约束下,使腹部金属发生压缩增厚,背部基本不变形。环向扩径是偏心的,偏心扩径保证了弯管腹部金属弯曲受压时壁厚增加量能顺利流向背部以补充弯管背部金属弯曲受拉时壁厚减薄补偿。为了保证弯管腹部金属塑性流动过程和弯管背部金属弯曲变形过程的协调性和连续性,弯管腹部之间的金属网格必呈梯形,方可保证弯头的壁厚均匀性。短半径弯头的相对弯曲半径越小,单位长度内的弯曲和扩径变形量越大,弯头成形难度越大。

 

关键字: 弯头;扩径推弯法;羊角芯头

Metal rheological characteristics of elbow made by expanding diameter and pushing bend
CHEN Jun, YANG Ying-li, YANG Hai-ying, WANG Ting-xun, DUAN Wen-sen

Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China

Abstract:The forming theory of elbow made by expanding diameter and pushing bend was induced. The tube blank of elbow takes place combined deformation with compaction along axial direction and expanding diameter along circumferential direction under the action of expanding diameter force along circumferential direction and pushing force along axial direction. The compaction compression deformation along axial direction makes tube blank bend deformation under the restrained acting of ram’s mandrel. Finally, the belly metal of elbow becomes thicken after compaction, while the back metal of elbow does not take place deformation. The expanding diameter along circumference direction is eccentric because the eccentric expanding diameter along circumference direction ensures the incrassated thickness flowing favorably from elbow belly to elbow back, supplying the alleviated thickness of back elbow because of undergoing bending and tension. The shorter the relatively bending radius is, and the larger the bending and expanding diameter degree is, the larger the deformation difficulty of elbow is in the unit length.

 

Key words: elbow; diameter-expanding and pushing method; ram’s mandrel

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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