What are the characteristics of roll operation?
What are the characteristics of roll operation? In the rolling process, the roll needs to withstand huge pressure and friction, and also to withstand high temperatures and rapid hot and cold alternations. Therefore, the roll must have high strength, wear resistance, heat resistance, and good fatigue resistance. In addition, the roll also needs to have a certain surface hardness to ensure the surface quality of the material rolling.
How to classify rolls by hardness value?
Rolls can be classified according to surface hardness, which is usually measured by Shore hardness (HSD) or Rockwell hardness (HRC) :
- Soft roll: Low hardness value, suitable for rolling softer materials.
- Medium hard roll: moderate hardness, suitable for general rolling process.
- Hard roll: high hardness value, good wear resistance, suitable for the rolling of high-strength materials.
How are rollers classified by material?
Rollers can be divided into the following categories according to material:
- Cast iron roll: often used in general rough rolling and plate rolling.
- Cast steel roll: with high strength, suitable for high temperature and high pressure conditions.
- Forged steel rolls: Better strength and toughness for tougher rolling environments.
- Alloy roll: By adding alloy elements to enhance the performance of the roll.
- High speed steel roll: high wear resistance and hardness, suitable for high speed and high precision rolling.
How to classify cast iron rolls?
Cast iron rolls are mainly divided into:
- Ordinary cast iron roll: has good wear resistance, often used in rough rolling process.
- Alloy cast iron rolls: Increase wear resistance and strength by adding alloying elements.
- Infinite chilled cast iron rolls: with high hardness and heat resistance, suitable for hot rolling mills.
- Ductile iron roll: both the hardness of cast iron and the toughness of steel, good wear resistance and strength.
How to classify cast steel rolls?
Cast steel rolls are mainly divided into:
Carbon cast steel roll: high carbon content, with good strength and toughness.
Alloy cast steel roll: by adding Cr, Mo and other alloying elements, improve the wear resistance and crack resistance of the roll.
High chromium cast steel rolls: for high temperature environments, high heat resistance and hardness.
How to classify forged steel rolls?
The classification of forged steel rolls includes:
Ordinary forged steel rolls: manufactured by forging process, with high strength and toughness.
Alloy forged steel roll: by adding alloying elements to improve wear resistance and hardness, suitable for rolling under high temperature conditions.
How are rollers classified by mill type?
Rolls can be classified according to the type of mill used:
- Hot roll: used in high temperature rolling process, requiring good heat resistance and fatigue resistance.
- Cold roll: used for rolling at room temperature, requiring high surface hardness and good finish.
- Special purpose rolls: such as special rolls for stainless steel and aluminum rolling.
How are rollers classified by forming method?
According to the forming method, the roll is mainly divided into:
- Casting roll: Molded by casting process, suitable for the production of large size rolls.
- Forging roll: formed by forging process, with higher strength and toughness, suitable for high-load rolling.
How are rollers classified by application?
According to the use, the roll can be divided into:
- Work roll: directly involved in the rolling process, to bear the rolling load.
- Support roll: used to support the work roll and share the pressure it bears.
- Intermediate roll: Used in multi-roll mill to transfer rolling pressure.
What are the main parameters of the roll structure and how to determine them?
The main parameters of roll structure include:
- Diameter and length: according to the specifications of the mill and production process.
- Material: Selected according to rolling material and working conditions, such as temperature, pressure, wear resistance and other requirements.
- Surface hardness: According to the type and quality requirements of rolled products, the higher the hardness, the better the surface quality and wear resistance.
- Toughness: Depending on the rolling load and impact force, the roll needs enough toughness to avoid breaking.
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