锻压技术

DN1800整锻管模拔长及空收成形技术

英文标题：Drawing and retract hole forming technology for DN1800 overall pipe mould

分类号：TG316

出版年,卷(期):页码：2022,47(11):70-77

摘要：

DN1800特大整锻管模锻件相对壁厚极小、规格大、吨位重、火次多、拔长效率低、技术要求高，且现有生产工装辅具不匹配，在工艺设计、质量控制和生产组织方面难度极大。通过研究锻造拔长机理及过程，提出控拔控压工艺方案、拔长效率提升控制方案和Φ1900 mm芯轴拔长+上平下V形砧空收+Φ2200 mm上圆弧下V形砧复合空收成形工艺方案，并结合工艺性分析，建立了塑性变形有限元分析模型，不断优化工艺参数，通过提出生产操作关键点，细化空收工艺参数，严格进砧量、压下量、温度和旋转角度的匹配控制，成功完成特大整锻管模的试制生产，验证了工艺参数及成形工艺的合理性，积累了特大整锻管模特殊锻造成形经验。

DN1800 extra-large overall pipe mould forgings has relatively small wall thickness, large specification, heavy tonnage, many heat treatment times, low drawing efficiency and high technical requirements, and the existing production tooling and auxiliary tools do not match. It is extremely difficult in process design, quality control and production organization. Therefore, by studying the mechanism and process of drawing forging，the process scheme of control drawing and control pressure, the drawing efficiency improvement control scheme and the process scheme of mandrel drawing of Φ1900 mm + retract hole forming with upper flat and lower V-shaped anvil + compound retract hole forming upper arc of Φ2200 mm and lower V-shaped anvil were proposed, and combined with the process analysis, a finite element analysis model of plastic deformation was established. Furthermore, the process parameters were continuously optimized. By proposing key points of production operations, refining the process parameters of retract hole and strictly matching control of anvil amount, reduction amount, temperature and rotation angle, the trial production of extra-large overall pipe mould was successfully completed to verify the rationality of process parameters and forming processes, which accumulated the experience in special forging and forming of extra-large overall pipe mould.

基金项目：

国家重点研发计划资助项目（2020YFB2008400）

作者简介：郭锐涛(1985-)，男，学士，工程师，E-mail：hngrt@163.com；通信作者：胡振志（1981-），男，硕士，工程师，E-mail：zhenzhi401@163.com

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