Abstract Copper tubes are efficient heat exchange parts in refrigeration industry, and their quality has a bearing on the grade of corresponding products. The cooling process of copper tube after three-roll planetary rolling is a key step in the production of copper tube by the casting and rolling method, and its cooling effect matters to the quality of copper tube products. Aiming at the characteristics of motion of a rolled piece in the through water cooling with a cooling water jacket, the method of “stepwise” moving cooling water jacket was used in this paper to achieve equivalence to the motion of the rolled piece, realizing finite element simulation of the whole process of three-roll planetary rolling and cooling of copper tube. The velocity field and pressure field of the fluid in the cooling water model were analyzed, and it was found that there existed a flow “dead zone” with the velocity below 8 m/s, there was a “negative pressure” phenomenon, and there were more eddy currents occurring. Through the study on the temperature field during the cooling process of the rolled piece, it was found that there was a phenomenon of non-uniform temperature distribution in the cooling process of the rolled piece. With the maximum temperature difference at each monitoring point in the cooling process of rolled piece as the evaluation criterion for the uniformity of temperature distribution in the cooling process of rolled piece, the process parameters affecting the rolled piece cooling effect, including the size of water inlet, the size of water outlet, and the pressure of entering water, were studied respectively, and the optimum process parameter values for improving the quality of rolled pieces were finally obtained. The accuracy of the model was verified by comparatively analyzing the metallographic microstructure and microhardness between the factory produced sample and the thermally simulated sample.

中文翻译：

---

三辊行星轧制后铜管冷却工艺研究

摘要 铜管是制冷行业的高效换热部件，其质量关系到相应产品的档次。三辊行星轧制后铜管的冷却过程是铸轧法生产铜管的关键步骤，其冷却效果关系到铜管产品的质量。针对带冷却水套通水冷却中轧件运动的特点，本文采用“逐步”移动冷却水套的方法，实现对轧件运动的等效，实现有限元铜管三辊行星轧制及冷却全过程模拟[J]. 分析了冷却水模型中流体的速度场和压力场，发现存在流速低于8 m/s的流动“死区”，存在“负压”现象，涡流发生较多。通过对轧件冷却过程中温度场的研究，发现轧件冷却过程中存在温度分布不均匀的现象。以轧件冷却过程中各监测点的最大温差作为轧件冷却过程中温度分布均匀性的评价标准，确定影响轧件冷却效果的工艺参数，包括进水口尺寸，分别研究了出水口的大小和进水的压力，最终得到提高轧件质量的最佳工艺参数值。通过对比分析工厂生产的样品和热模拟样品的金相组织和显微硬度，验证模型的准确性。