身管弹膛和线膛同锻时下沉段皱褶试验研究及其预测  

The Experimental Study and Prediction of Wrinkles in Sinking Zone of Barrel Forged with Chamber and Rifled Bore

作　　者：童维 杨晨[1] 杨宇召 扶云峰 陈晓萍 樊黎霞[1] TONG Wei;YANG Chen;YANG Yuzhao;FU Yunfeng;CHEN Xiaoping;FAN Lixia(School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China;Chongqing Jianshe Industry (Group) Co. , Ltd. , Chongqing 400054, China)

机构地区：[1]南京理工大学机械工程学院,江苏南京210094 [2]重庆建设工业(集团)有限责任公司,重庆400054

出　　处：《兵工学报》2020年第5期865-873,共9页Acta Armamentarii

基　　金：国防基础科研项目(JCKY2016209A002)。

摘　　要：身管弹膛和线膛同锻技术可用径向精锻工艺同时锻出弹膛和线膛,将彻底解决身管弹膛和线膛的同轴度问题,改善坡膛部位的表面粗糙度。为提高身管内膛的加工质量,以身管弹膛和线膛同锻为对象,研究下沉段和锻造段产生的褶皱以及演变情况。通过对身管径向锻打试验和形貌试验分析处理,发现弹膛和线膛同锻时:下沉段将会产生褶皱,并且褶皱随着变形的增加,深度不断加深;当进入锻造段后,部分皱褶被打平,变成了身管微裂纹。应用有限元分析软件Abaqus对身管锻打过程进行仿真,发现锻打过程中下沉段径向应变εr和周向应变εθ的比值εr[]εθ为定值,不同锻打工艺参数下应变比值不同。研究结果表明:身管下沉段单次锻打产生的褶皱深度Δdw可以用径向应变εr和周向应变εθ的比值εr[]εθ来表示,拟合的关系式为Δdw=0.0588εr[]εθ+0.0521;结合锻打所需的锤数可以预测出下沉段结束位置的皱褶深度,皱褶深度的预测有助于防止褶皱在锻造段挤压形成锻造身管的微裂纹。The radial forging process for both chamber and rifled bore is used to improve the coaxiality of rifled bore and the surface quality of chamber.The wrinkles may be formed on the inner surface of barrel during forging.The formation of wrinkles and their evolution are studied.The scanning electron microscope is used to check the inner surface of forged barrel.The results show that the wrinkles are formed in the sinking zone firstly during the radial forging processing.With the increase in deformation,the depth of wrinkles becomes bigger gradually.When the sinking zone turnes to the forging zone,some wrinkles are smoothed under the resistance of the mandrel.Nevertheless,some wrinkles are too deep to smooth and be turned to the fissures.The finite element software ABAQUS is used to simulate the forging process of barrel.It is found that the ratio of radial strain and circumferential strain is nearly same in the sinking zone,and the strain ratio is determined from the forging process parameters.The results show that the wrinkle depth per stroke can be expressed by the ratio of radial strain and circumferential strainεr[]εθ,and the fitted relational expression isΔdw=0.0588εr[]εθ+0.0521.The total depth of wrinkles can be predicted from the number of the stroke required for whole sinking zone and the value ofΔdw.The prediction of wrinkle depth helps to prevent the wrinkles from being squeezed into fissure in the forging zone.

关 键 词：身管 弹膛和线膛同锻 皱褶 应变比 皱褶深度预测 

分 类 号：TJ203.1[兵器科学与技术—武器系统与运用工程] TG316.192[金属学及工艺—金属压力加工]