线棒材轧制用冷却器的优化设计与应用

针对棒线材生产用套筒式冷却器存在冷却能力不足，难以满足低温轧制的要求；轧件表面周向温度均匀性较差等问题，对套筒式冷却器结构进行了优化设计，得到旋流式冷却器。其采用圆锥斜齿轮式喷嘴，使冷却管内的水流形成旋流，可以产生较高的压力和速度，大幅度提高冷却能力，同时有效改善轧件表面温度的均匀性。采用SOLIDWORKS软件建模，利用ANSYS CFX软件进行流体仿真，对两种冷却器的流场、压力、流速进行了仿真分析。结果表明，旋流式冷却器可以提高冷却效率，改善轧件温度的均匀性，为实现轧件的超快速冷却创造有利条件。对24 mm圆钢的冷却应用表明，旋流式冷却器对轧件的降温幅度为套筒式冷却器的1.5～2.0倍且冷却均匀性明显改善。

Optimization design and application of the cooler for wire rod and bar rolling

Aiming at the insufficient cooling capacity and difficult to meet the requirements of low temperature rolling,and the bad circumferential temperature uniformity of the piece of the sleeve cooler for wire rod and bar production, the structure of sleeve cooler was improved designed,and the swirl cooler was obtained.It adopts a conical helical gear nozzle to make the water flow in the cooling pipe form a swirling flow,which can generate a higher pressure and speed,greatly improve the cooling capacity,and effectively improve the uniformity of the surface temperature of the piece.Modeling with SOLIDWORKS software and fluid simulation with ANSYS CFX software,the flow field,pressure,and flow rate of the two kinds of cooler were simulated.The results show that the cooling efficiency and the temperature uniformity of the piece are improved by the swirl cooler,and favorable conditions for achieving ultra-fast cooling of piece are created.The swirl cooler application for 24 mm round bar shows that the temperature drop of piece is 1.5 to 2.0 times that of the sleeve cooler and the cooling uniformity is significantly improved.