锻压技术

大规格铜镍合金凸缘热挤压成形工艺

英文标题：Hot extrusion forming process of large-size copper-nickel alloy flange

分类号：TG146.1

出版年,卷(期):页码：2023,48(4):169-175

摘要：

传统大规格凸缘通常采用“锻造成形+机加工”的工艺生产，锻造损耗较大，为保证凸缘成品质量，需要增大加工余量，但这会导致材料利用率较低。针对此问题，以DN700大规格铜镍合金凸缘为研究对象，对其产品结构和成形工艺进行分析。利用有限元分析软件对DN700大规格凸缘成形过程进行模拟分析，改进了现有生产工艺，并设计制作了配套成形模具。最后进行了试验验证，完成DN700大规格凸缘新工艺的试制，获得了抗拉强度大于280 MPa、屈服强度大于105 MPa、伸长率大于30%的样件。结果表明，采用挤压成形工艺成形DN700大规格铜镍合金凸缘大大降低了产品的生产成本、提高了材料利用率。

The traditional large-size flanges are usually produced by the process of “forging+maching”, and the forging loss is relatively large. In order to ensure the quality of finished flange, it is necessary to increase the processing allowance which will lead to lower material utilization. Aiming at this problem, for DN700 large-size copper-nickel alloy flange, its product structure and forming process were analyzed, and the forming process of DN700 large-size flange was simulated and analyzed by finite element analysis software. Then, the existing production process was improved, and the matched forming mold was designed and made. The experimental verification results show that the trial production of new process of DN700 large-size flange is completed, and the samples with the tensile strength greater than 280 MPa, the yield strength greater than 105 MPa and the elongation greater than 30% are obtained. Thus, the extrusion forming process is used to form DN700 large-size copper-nickel alloy flanges, which greatly reduces the production cost of product and improves the utilization rate of material.

基金项目：

国家重点研发计划资助项目（2021YFB3700700）

作者简介：付利国(1979-)，男，学士，高级工程师 E-mail：1139591076@qq.com 通信作者：周铁柱(1989-)，男，硕士，工程师 E-mail：aaronchow@163.com

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