锻压技术

弹壳打凹-平底成形微折叠缺陷分析及改进措施

英文标题：Micro-folding defect analysis and improvement measures on indenting-heading for cartridge case

作者：刘新郭睦基刘东陶志勇李雄张高娟

分类号：TG376

出版年,卷(期):页码：2024,49(3):152-160

摘要：

以某型号弹壳为研究对象，针对初始设计方案中弹壳底部成形后底火室侧壁微折叠的问题，通过微观组织观察和数值模拟确定微折叠产生于打凹成形，而导致微折叠产生的原因为：打凹成形过程中，隔板处金属的径向和轴向流动明显快于内侧壁，导致隔板与内壁连接处圆角的曲率半径持续变小，直至出现微折叠缺陷。同时，该微折叠缺陷在平底成形时保留并随着侧壁金属的轴向流动向下移动，与实际观测到的微折叠缺陷位置相吻合。为提高弹壳成形质量和避免该缺陷问题，提出一种修改打凹成形模具尺寸以改善打凹成形金属流动的改进方案，数值模拟和工艺试验结果均表明，采用改进方案后，打凹壳、平底壳均无微折叠缺陷，其他尺寸达到设计要求，改进工艺方案能够满足实际生产需求，提高了弹壳底部成形质量。

For a certain cartridge case, aiming at the problem of micro-folding in the side wall of bottom fire chamber after the bottom forming of cartridge case in the initial design scheme, the micro-folding occurred during the indenting was determined by microstructure observation and numerical simulation, and the causes of micro-folding were clarified. During the indenting process, the radial and axial flow of metal at the partition was significantly faster than that in the inner wall, resulting in a continuous reduction of curvature radius for the fillet at the connection zone between partition and inner wall, until there was a micro-folding defect. At the same time, the micro-folding defect retained and moved down a short distance with the axial flow of metal in the side wall during the heading process, which was consistent with the actual observed position of micro-folding defect. In order to improve the forming quality of cartridge case and avoid the defects, an improved scheme of modifying the dimension of indenting die to improve the metal flow during the indenting process was proposed. The numerical simulation and process test results show that by the improved scheme, there is no micro-folding defect in the indenting and heading cases, and other dimensions meet the design requirements. Thus, the improved scheme can meet the actual production requirements and improve the forming quality of the bottom for the cartridge case.

基金项目：

作者简介：刘新(1995-)，女，硕士，工程师，E-mail：1324703458@qq.com

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