锻压技术

柴油发动机SCR系统尿素罐体旋压成形工艺

英文标题：Spinning process of urea tank for diesel engine SCR system

作者：郑嫄郭亚明黄涛穆崇礼黄明智

分类号：TG376

出版年,卷(期):页码：2025,50(6):102-107

摘要：

针对柴油发动机SCR系统尿素罐体高效无缝工艺的需求，将管料毛坯经两道次反向流动旋压+缩径旋压收口，研制出了满足设计要求的尿素罐体，同时，通过试验探究了旋压温度、主轴转速、进给比、旋压轨迹等工艺参数对旋压收口成形质量的影响。试验结果表明，热旋收口是实现304不锈钢尿素罐体精确成形的有效技术途径之一，最优工艺参数组合为：径向等距划分轨迹、旋压温度为750 ℃、主轴转速为300 r·min-1、进给比为0.7 mm·r-1，此工艺参数组合下旋制的尿素罐体固溶后的抗拉强度≥525 MPa、规定非比例延伸强度≥210 MPa，伸长率≥36.8%，满足技术指标要求。最后，对旋制的尿素罐体进行了内压、气密及疲劳试验,其性能指标满足SCR系统设计要求。

In response to the demand of the high-efficient seamless processes for the urea tank of diesel engines SCR system, the pipe blank was subjected to two-passes of reverse flow spinning + shrinkage spinning necking to develop a urea tank that met the design requirements. At the same time, the influences of process parameters such as spinning temperature, spindle speed, feeding ratio and spinning path on the forming quality of spinning necking were explored by experiments. The experimental results show that the hot spinning necking is one of the effective technical approaches to achieve precise forming of 304 stainless steel urea tank. The optimal combination of process parameters is that the radial equal-spaced spinning path is used, the spinning temperature is 750 ℃, the spindle speed is 300 r·min-1 and the feeding ratio is 0.7 mm·r-1. Under this combination of process parameters, the tensile strength of the spun urea tank after solution treatment is ≥525 MPa, the specified non-proportional extension strength is ≥210 MPa, and the elongation is ≥36.8%, which meet the technical requirements. Finally，the internal pressure, air tightness and fatigue experiments are carried out on the spun urea tank, and the results all meet the expected technical parameters.

基金项目：

吉林省科技发展计划项目（20210201046GX）

作者简介：郑嫄（1994-），女，硕士，助理研究员,E-mail：zhengyuan1126@126.com

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