The roll continuously plastic deforms the main workpiece and tool on the rolling mill. The roller consists of a roll body, a roll neck and a shaft head.
The roll body is the middle part involved in rolling metal. It has a smooth or fluted surface.
The roll neck is installed in the bearing and the rolling force is transferred to the frame through the bearing housing and the pressing device.
The gear seat is connected to the shaft end by the connecting shaft. The motor’s rotating torque is transmitted to the roller.
We can arrange rollers into two, three, four or more rollers in the roll frame.
A brief history of roll development With the progress of metallurgical technology and the development of rolling equipment, the types of rolls and manufacturing processes continue to develop.
Roll classification There are various roll classification methods
- According to the product type, there are steel roll, steel roll, steel wire roll, etc.
- According to the position of the roll in the rolling mill series, there are roll blanks, rough rolls, etc. Sorting volumes, etc.;
- According to the rolling function, there are calibration rollers, perforating rollers, levelling rollers, etc.
- We divide the roller into steel roller, cast iron roller, carbide roller, ceramic roller, etc.
- Press manufacturing methods include casting roll, forging roll, surfacing roll, nested roll, etc.
- We divide the hot roll and the cold roll according to the state of the rolled steel.
The operating conditions of rolls in different types of rolling mills vary greatly
- Rolling mill conditions. Such as mill type, mill design, hole design, water cooling conditions and bearing type.
- Rolling conditions, such as vehicle varieties, specifications and deformation resistance, pressing systems and temperature systems, production requirements and operations.
- Requirements for product quality and surface quality. Therefore, different types of mills of the same type and using different conditions have different requirements for the performance of the used rolls.
For example, billet and slab uplift rolls must have good torsional and bending strength, toughness and occlusion, heat crack resistance and thermal shock resistance and wear resistance; And tropical finishing tables require high hardness, anti-indentation, wear resistance, peeling and thermal cracking resistance on the roll surface. Understanding the conditions of use of rollers and the failure mode of rollers used in the same type of rolling mill, as well as understanding the current performance and manufacturing process of various rolls, can correctly formulate the technical conditions of rolling mills and select the appropriate and economical rolls.
The most common method of rolling mill roll performance
- Roll weight (kg) consumed by rolling 1T rolled pieces (called roll consumption), the unit is kg/t.
- We express the weight of rolled material per unit of roll diameter in t/mm in terms of diameter reduction.
Roll performance requirements
- Heat cracking Generally, We mainly use rough rolls for strength and heat cracking.
- The working roll weight of the small 20-high mill is only about 100 grams, and the supporting roll weight of the wide and thick plate mill is more than 200 tons.
- The high speed of the hardness finishing roll requires a certain surface quality to roll the final product. The main requirements are hardness and wear resistance.
- Shock-proof performance In addition, there are some special requirements for the roll, such as a large reduction, the roll needs a strong bite ability, more impact resistance.
- When rolling thin specification products with smooth surface treatment.
- The rigidity of the roller, uniformity of structure and performance, processing accuracy and surface finish are more stringent.
- Cutting performance When rolling has a complex cross-section, it is also necessary to consider the machining performance of the working layer of the roll body.
Carbide roll classification
- Solid carbide roll composite carbide roll.
- Composite carbide roll.
The whole carbide roll has been widely used in pre-finishing and finishing supports for high speed wire rolling mills, including fixed deceleration frames and pinch roll frames.
The composite carbide roll consists of carbide and other materials, which can be further divided into carbide composite roll rings and monolithic carbide rolls.
With the continuous development of roll manufacturing technology and use technology, the use of cemented carbide rolls will continue to expand. Its role in rolling processing will become more and more important, and its application prospects will be very broad. Check out our high quality tungsten carbide roll rings here.