凸台结构内丝接头的冷镦成形工艺  

Cold heading process on inner wire joint with boss structure

作　　者：杨成 郑志军 孙宝寿[1] 陈玉强 王英[1] 陈兴[1] Yang Cheng;Zheng Zhijun;Sun Baoshou;Chen Yuqiang;Wang Ying;Chen Xing(School of Mechanical Engineering and Mechanics,Ningbo University,Ningbo 315211,China;Ningbo Aneng Automobile Parts Co.,Ltd.,Ningbo 315145,China)

机构地区：[1]宁波大学机械工程与力学学院,浙江宁波315211 [2]宁波阿能汽车部件有限公司,浙江宁波315145

出　　处：《锻压技术》2023年第4期16-23,共8页Forging & Stamping Technology

基　　金：校企合作项目(HK2021000306)。

摘　　要：针对汽车刹车管路中的内丝接头零件,其内部关键部分——凸台结构具有尺寸小、尺寸要求高等特点,采用一种六模六冲的冷镦加工方式进行生产。首先,根据影响凸台成形的关键尺寸因素设计了3因素3水平的正交实验。其次,运用Deform-3D有限元分析软件对正交实验中凸台成形工步的等效应力、等效应变以及模具的受力分布进行分析,计算得到工步2~工步4的变形程度分别为42.7%、66.0%和40.0%。同时,得出多因素对凸台成形的影响程度为预成形凸台深度>法兰高度>预成形法兰上端面至顶面的距离,得到凸台成形饱满、冲头受力最小条件下的最适尺寸组合为预成形凸台深度为9 mm、法兰高度为6 mm、预成形法兰上端面至顶面的距离为11 mm。研究成果为类似凸台件的冷镦成形提供了一定的指导性意见。For the inner wire joint parts in automobile brake pipeline,the boss structure which is the internal key part has the characteristics of small size and high size accuracy requirement.A six-die and six-punch cold heading processing method was adopted for production.Firstly,the orthogonal experiment of three factors and three levels were designed according to the key dimension factors affecting the boss forming.Secondly,Deform-3D finite element analysis software was used to analyze equivalent stress,equivalent strain and force distribution of die for the boss forming step in the orthogonal experiments,and the calculated deformation degrees of step 2-step 4 were 42.7%,66.0%and 40.0%,respectively.At the same time,the affecting degrees of various factors on the boss forming was obtained as preformed boss depth>flange height>distance from upper end surface and top surface of preformed flange,and the optimal size combination was found under the conditions of full boss forming and minimum punch force,that is,the preformed boss depth is 9 mm,the flange height is 6 mm,and the distance from upper end surface and top surface of preformed flange is 11 mm.The study result provides a certain guidance for the cold heading of the similar boss parts in the future.

关 键 词：内丝接头 凸台结构 冷镦 等效应力 等效应变 模具受力 

分 类 号：TG376.3[金属学及工艺—金属压力加工]