棒材穿水冷却装置的基本原理是什么？

在精轧机后设有一个由数个水冷箱组成的可调水冷段，对棒材进行急剧冷却，使棒材表面形成马氏体***，在随后的温度***过程中，芯部热量散出对表面马氏体***可产生回火作用，结果棒材表面层为回火马氏体，芯部为细粒珠光体及索氏体***。这种***结构使棒材屈服极限和韧性提高，并具有良好的可焊性。以一些小型冷轧机来说，由于它们大可配置75KW的电机，因此设备的轧制速度大也就达到3米每秒。

What is the basic principle of the bar water cooling device?

After the finishing mill, there is an adjustable water cooling section of several water cooling boxes. The rod material is cooled sharply to form martensite structure. During the subsequent temperature recovery process, the heat of the core can produce tempering on the surface martensite, and the surface layer of the rod is tempered martensite, the core is fine pearlite and Soxhlet body. This structure improves the yield limit and toughness of bars, and has good solderability.

横轧有两种类型：一类是轧辊孔型沿轴向是不变的，沿径向呈周期变化。轧件主要靠径向变形实现成型。另一类是锲横轧工艺，即在两个或者三个互相平行布置的轧辊或两个平板的表面上.

There are two types of cross rolling: one is the roll pass is unchanged along the axis, and the other is radial variation. The workpiece is mainly formed by radial deformation. The other is the cross rolling process, that is, on the surface of two or three parallel rolls or two plates.

轧钢机在辊系的装配上，主要的应该是轴承的使用，虽然短圆柱的轴承在寿命上都比较长，而且承载的能力也比较大，但是，其不可以承受轴向力，因为使用的是双列较的接触轴承.

The main part of the rolling mill assembly of the roll system should be the use of the bearing. Although the bearing of the short cylinder is long in life, and the capacity of the bearing is relatively large, it can not bear the axial force, because the use is a double row of contact bearing.