AbstractIn order to predict the flattening rate of the cross-section accurately during the tube bendingthegeneration principlethe solution and the influence factor of the cross-section flattening were studied.Onthe basis of the plane-stress and the assumption that the plastic volume is constantthree-dimensional strainformulas were established in consider of the cross-section flattening.41554
Considering the wall-thickness changethe approximate calculation formulas of short axis flattening rate were deducedwith the outer diameter andthe inner diameter as parameters.Because different materials have different cross-section flattening ratesamaterial correction factor was introduced to modify the formula based on experiments.Finallythe validityof the theoretical formulas was proved according to the calculation and the experiment resultswhich canprovide a reference for the forming quality prediction in tube bending.Key wordscoreless tube bendingcross-section flatteningwall-thickness variationchange-rate of shortaxisCLC numberTH 386.3  Document codeA  Article ID1004-0579201401-0037-05  The cross-section flattening is one of the inevi-table defects during the tube bending processwhichaffects the flow statevelocity distribution of themedium and the tube functional effects directly.Howeverdue to the measure difficulty of the tubeinner diameterthe cross-section flat rate of outerdiameter is usually used to evaluate the tube bendingforming qualitywhich ignores the change of innerdiameter caused by wall-thickness strainand leadsto the reduction of the evaluation credibility.As aresultit is important to study the flattening genera-tion mechanism of cross-section in tube bendingprocess and establish accurate theoretical formula.
上一篇:细长不锈钢带的展平英文文献和中文翻译
下一篇:冷挤压模的预应力英语文献和中文翻译

300兆瓦循环流化床锅炉受...

U型弯曲部分工艺对中心式...

弯曲处的残余应力模型英文文献和中文翻译

弯曲序列级进模英文文献和中文翻译

连续模弯曲顺序英文文献和中文翻译

级进模确定弯曲顺序新方...

镁合金板材弯曲工艺冷冲...

紫陵阁

组态王文献综述

林业机械作业中的安全性问题【2230字】

小学《道德与法治》学习心得体会

大学生就业方向与专业关系的研究

适合宝妈开的实体店,适...

人事管理系统开题报告

淮安市老漂族心理与休闲体育现状的研究

浅谈动画短片《天降好运》中的剧本创作

弹道修正弹实测弹道气象数据使用方法研究