| 轧辊轴承的工作特点 |
| 添加时间：2018/8/31 15:33:55 浏览次数： |
| 轧辊轴承是用来支撑轧辊的，和一般用途的轴承相比，轧辊轴承有以下特点： Roll bearings are used to support the rolls. Compared with general purpose bearings, roller bearings have the following characteristics: （1）承受很高的单位压力。由于轴承座外形尺寸受到限制，不能大于辊身最小直径，且辊颈长度又较短，所以轴承上单位载荷大。通常轧辊轴承的单位压力广高达2000-4800Mpa，为普通轴承的2-5倍，而且pv值（单位压力和线速度的乘积）是普通轴承的3-20倍。 (1) under very high unit pressure. Because the bearing seat size is limited, can not be greater than the minimum diameter of the roller body, and the length of the roller neck is short, so the unit load on the bearing is large. Usually the unit pressure of roller bearings is as high as 2000-4800 Mpa, which is 2-5 times that of ordinary bearings, and the PV value (the product of unit pressure and linear velocity) is 3-20 times that of ordinary bearings. （2）运转速度差别大。不同轧机的运转速度差别很大，例如，现代化的六机架冷连轧机出口速度已达42m/s，高速线材轧机出口速度达到100m/s，而有的低速轧机速度只有0.2m/s。显然，不同速度的轧机应使用不同类型的轴承。 (2) the speed of operation is quite different. For example, the outlet speed of modern six-stand tandem cold mill has reached 42m/s, the outlet speed of high-speed wire rod mill has reached 100m/s, while the speed of some low-speed mills is only 0.2m/s. Obviously, different types of bearings should be used for rolling mills at different speeds. （3）工作环境恶劣。热轧时轧辊都要用水冷却，且污水、氧化铁皮等容易落入轴承。冷轧机采用工艺润滑剂（乳化液等）来润滑、冷却轧辊与轧件，它们是不能与轴承润滑剂相混的。因此，对轴承的密封提出了较高的要求。 (3) the working environment is bad. When hot rolling, the roller must be cooled by water, and the sewage and oxide scale will easily fall into the bearing. Cold rolling mills use process lubricants (emulsifiers, etc.) to lubricate and cool rolls and rolled pieces, which are not miscible with bearing lubricants. Therefore, higher requirements for bearing seal are put forward. 因此，对轧辊轴承的要求是承载能力大、摩擦系数小、耐冲击，可在不同速度下工作，在结构上，径向尺寸应尽可能小（以便采用较大的辊颈直径），有良好的润滑和冷却条件。 Therefore, the requirements for roller bearings are large bearing capacity, small friction coefficient, impact resistance, can work at different speeds, in the structure, the radial dimension should be as small as possible (in order to use a larger diameter of the roller neck), with good lubrication and cooling conditions. |
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