弹膛成形时的工艺参数影响分析及知识库的建立

【作者】 何湘玥；

【导师】 樊黎霞；

【作者基本信息】 南京理工大学 ， 机械制造及其自动化， 2011， 硕士

【摘要】 弹膛是枪管的重要组成部分,其主要作用是容纳枪弹,保证枪弹发射时能够正确定位和射击。身管线弹膛采用径向锻造工艺一起锻出,不但能保证锻件的高精度,而且可以减少后续机械加工,还能使身管线膛与弹膛保持极高的同轴度。基于国内身管线弹膛精锻工艺还不够完善的现状,对影响身管弹膛精锻成形的工艺参数进行分析就具备重要的现实意义。本文针对影响身管弹膛精锻成形的主要工艺参数,运用有限元分析软件ABAQUS对身管线弹膛精锻的整个过程进行数值模拟,并用解析法对锻打位置的几何参量进行求解,完成了如下工作：(1)依照身管线弹膛精锻过程中材料的塑性成形机理,用解析法对影响弹膛成形的关键参数即抬锤位置进行求解,得出了弹膛成形的必要条件。(2)通过数值模拟展示了身管弹膛精锻过程中出现的锻造缺陷；依据毛坯成形过程中材料的流动情况,对锻造缺陷的形成机理进行了分析。(3)分析身管精锻过程中主要工艺参数,包括抬锤位置、轴向进给速度、夹持压强等对弹膛成形的影响；对锤头和芯棒的结构进行分析,讨论了不同芯棒弹膛锥角与锤头角度的匹配关系。(4)对精锻过程中各工艺参数对弹膛成形的影响进行汇总并建立知识库,重点对实现其中主要模块的关键技术进行研究,以期为实际生产提供直观实用的理论支持。更多还原

【Abstract】 The chamber is one important part of barrel while its leading roles are holding bullets and guaranteeing the orientation when launching bullets. When the rifling and chamber of barrel are produced at same time with the radial forging process, it does not only guarantee higher forging precision and less following machine processing, but also let the rifling and chamber of barrel maintain extremely high proper alignment. For that the domestic radial forging technology of barrel is insufficiently perfect at the present, it is significant to do researches on the process parameters’ influence analysis over the forming of chamber with the radial forging technology.In view of the influence of the main process parameters over chamber’s forming in the radial forging of barrel, numerical simulation of chamber’s forming process is carried on with the finite element analysis software ABAQUS and the geometry parameters of the forging position are calculated with the analysis method. The following works are completed in this thesis.(1) During the chamber’s forming process of the radial forging, the position of lifting hammer is a key parameter of which influence chamber’s forming. According to the material’s plastic forming mechanism of barrel, the perfect location of lifting hammer is figured out with the analysis method.(2) The forging flaws during the radial forging process of chamber are showed by the numerical simulation. The formation mechanism of the forging flaws is analyzed base on the material’s flow status of barrel during the forming process.(3) During the radial forging process of the barrel’s rifling and chamber, the influences of major process parameters which include lifting position of hammer, the axial feed speed and the clamp’s pressure are analyzed. The matching relations between different cone angles of the mandrel and the hammer’s cone angles are discussed.(4) The various process parameters’ influences to the chamber’s forming are compiled and the knowledge library about the chamber’s forging is established which may provide direct-viewing and practical theory support for the actual production.更多还原