摘要
针对小型轻量化汽车驱动电机的高峰值扭矩和高持续功率要求,对槽满率电机绕组专用窄矩形截面电磁线拉拔成形过程中截面塑性变形均匀性控制进行研究,运用有限元软件对铜扁线拉拔过程进行了建模仿真,验证了多道次成形方案的可行性。研究结果表明:在特定的长宽比下圆角处变形程度远大于窄边处,窄边也大于宽边处,为了解决横截面金属塑性流动不均匀的问题,采用控制变量法,通过优化拉拔模的拔模角和定径带长度,并引入不均匀系数N表征坯料变形的均匀程度,最终获得截面变形较均匀的工艺参数与模具结构参数组合,为企业生产窄矩形截面铜扁线提供工艺参考。
In order to meet the requirements of peak torque and high continuous power of small and lightweight automotive drive motors,the uniformity of plastic deformation of narrow rectangu⁃lar cross-section in the process of electromagnetic wire drawing for the motor windings of slot fill⁃ing ratio was studied.Finite element software was used to model and simulate the drawing process of copper flat wire,and the feasibility of multi-pass forming scheme was verified.The results showed that the degree of deformation at the rounded corner was much greater than that at the narrow side,and the narrow side was also greater than that at the wide side under a specific aspect ratio.To solve the problem of plastic flow nonuniformity of cross section metal,the control vari⁃able method was adopted,by optimizing die angle and the length of calibrating strap in drawing die,and the non-uniformity coefficient N was introduced to characterize the uniformity of billet de⁃formation,and the combination of process parameters with better section deformation uniformity and die structure parameters was finally obtained,which provided a process reference for enter⁃prises to produce narrow rectangular section flat copper wire.
作者
王锦波
王冬艳
彭春斌
王成勇
金爱民
WANG Jin-bo;WANG Dong-yan;PENG Chun-bin;WANG Cheng-yong;JIN Ai-min(Anhui Feixiang Electric Co.,Ltd.,Xuancheng,Anhui 242600,China;School of Materials Science and Engineering,Hefei University of Technology,Hefei,Anhui 230009,China;Tongling Jingda Special Magnet Wire Co.,Ltd.,Tongling,Anhui 244000,China)
出处
《模具工业》
2021年第4期66-71,共6页
Die & Mould Industry
基金
2018年安徽省科技重大专项项目(1803901044)。
关键词
电磁线
拉拔
有限元分析
工艺优化
electromagnetic wire
drawing
finite element analysis
process optimization
