锻压技术

球形管件多工位冷镦内折叠原因分析与工艺改进

英文标题：Reason analysis on inner folding and process improvement of multi-station cold upsetting for spherical pipe

作者：史士鹏冀晋辉李文奇

分类号：TG376.3

出版年,卷(期):页码：2022,47(7):138-144

摘要：

首先介绍作为减震部件内芯的球形管件的多工位冷镦挤成形方式和产品应用，然后提出球形管件在多工位冷镦生产中遇到的内折叠缺陷问题。为了分析出产品产生内折叠的原因，对初始成形工艺方案进行有限元模拟分析和成形理论分析。得出镦挤球形部分的材料强度分布不均匀是零件产生内折叠的主要原因。随后通过对实际生产零件的切割取样和硬度测量,并将硬度值转化为强度值，得到实际镦挤球形部分的材料强度分布曲线。该曲线验证了理论分析的准确性。最后以理论分析的结论为依据改进成形工艺方案，并实际生产零件。生产零件没有内折叠缺陷，达到了保证零件质量并稳定生产的目的。

Firstly, the multi-station cold upsetting extrusion forming method and product application of spherical pipe as the inner core of shock absorber were introduced, and then, the problem of inner folding defects encountered in the production of multi-station cold upsetting for spherical pipe was proposed. In order to analyze the reasons for the inner folding of the part, finite element simulation analysis and forming theoretical analysis were carried out on the initial forming process scheme, it was concluded that the non-uniform strength distribution of the material in the spherical part of upsetting extrusion was the main reason for the inner folding of the part. Furthermore, the material strength distribution curve of the spherical part for the actual upsetting extrusion was obtained by cutting sampling and hardness measurement of the actual produced part and the hardness value was converted into strength value. The accuracy of the theoretical analysis was verified by the curve. Finally, based on the conclusion of the theoretical analysis, the forming process scheme was improved, and the parts were actually produced. The results show that the produced parts have no inner folding defects, so as to achieve the aim of ensuring the quality of parts and stabilizing the production.

基金项目：

作者简介：史士鹏（1988-），男，硕士，工程师 E-mail：shisp@singukeller.com

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