High-speed wire rod mill bearing and its application

In order to meet the increasing demand for steel for construction, China's metallurgical industry has introduced dozens of high-speed wire production lines from abroad in recent years. The speed of the discharge port ranges from 63 to 100m/s, and the annual output is mostly 60×104～100×. Between 104t. Due to the particularity of the work of the high-speed rolling mill, more stringent requirements are imposed on the bearings used. This paper briefly introduces the working characteristics, structural form, design points and manufacturing key of high-speed wire rod mill bearings (hereinafter referred to as high-speed rolling mill bearings).
1 Performance requirements
1.1 High reliability
The most notable feature of the high-speed wire production line is the high reliability of the continuous operation of the rolling mill. Due to the high unit output of the high-speed wire production line, it is required that the bearing which is a key component of the rolling mill has higher reliability than the general rolling mill bearing in the prescribed inspection cycle. If the failure of the bearing will cause the entire production line to stop production, this is not tolerated by the manufacturer. Therefore, when designing and manufacturing high-speed rolling mill bearings, the reliability of continuous operation under high-speed operating conditions should be guaranteed.
1.2 wear resistance
High-speed rolling mill bearings have strong wear resistance and can adapt to high-speed rotating work. Example: A high-speed wire production line with an exit line speed of 63m/s and an outlet mill roll with a working diameter of 330mm, the bearing's working speed is 3650r/min, long-term operation under high speed and heavy load, and wear resistance to the bearing. It is a severe test. This requires that the bearings supplied must have wear resistance requirements.
1.3 Long fatigue life
High-speed rolling mill bearings have a long fatigue life. Under normal circumstances, the high-speed rolling mill bearings provided abroad are used for three years (because half of the time, the roller components are to be unloaded for maintenance and repair, and the actual working time is one and a half years), so the user requires domestic bearings to be used for at least two years.
1.4 Impact toughness is better
The impact toughness of the high-speed rolling mill bearing is better, especially for the bearing used in the rough rolling mill. The impact load is large during the rolling of the continuous casting billet into a bar stock. Therefore, high-speed rolling mill bearings should not crack when working under high speed and high impact.

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Bearing housing and shaft and bearing clearance

Bearing housing installation
Standard type
Several methods of mounting the bearing housing with snap rings and retaining plates.
Mounting the bearing with the set screw will cause the bearing casing to deform and should be avoided as much as possible.
Flange type
When installing a flange type linear bearing, the precision of the surface of the bearing housing must be accurate.
Adjustable type (small opening type)
The bearing is perpendicular to the opening in the bearing housing to obtain a uniform preload in the circumferential direction.
Large open type
If used in conjunction with a suitable housing, large-open bearings can also be adjusted for clearance, even with light preload.
.Precautions during installation
When the linear bearing is installed in the bearing housing, auxiliary work should be used to avoid direct tapping of the end face or the sealing ring. The bearing should be evenly introduced, and the buffer plate should be used to load it with a gentle tap.
To thread the optical axis into the linear bearing, the shaft and the centerline of the bearing must be aligned. If the shaft is inserted obliquely, the balls may fall off or cause the cage to be deformed and damage the linear bearings.
The applied load should be evenly distributed over the entire bearing, especially when subjected to transient loads. Two or more bearings should be used. Linear bearings are not subject to rotating loads, which can cause accidents.

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