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Performance requirements for rolling rolls

Performance requirements for rolling rolls

As is well known, corrugated rollers are the core components of corrugated cardboard production lines, and the correct use and maintenance of corrugated rollers are particularly important. 1. Try to use high-quality corrugated base paper as much as possible. Practice has shown that in digital printing in China, low-cost and low-quality corrugated base paper can exacerbate the wear and tear of corrugated rollers, reducing their service life. 2. Install a limit device to accurately adjust the pressure and gap between the corrugated roller and the pressure roller. In the single-sided machine of the corrugated cardboard production line, when the corrugated peak of the adhesive coated corrugated cardboard is bonded to the surface paper, there needs to be a certain pressure between the corrugated roller and the pressure roller to ensure the bonding effect.

Roll classification

Roll classification

There are various classification methods for rollers, mainly including: (1) strip steel rollers, profile steel rollers, wire rod rollers, etc. according to product types; (2) According to the position of the rolling rolls in the rolling mill series, they are divided into blooming rolls, rough rolling rolls, finishing rolls, etc; (3) According to the roll function, there are scale breaking rolls, piercing rolls, leveling rolls, etc; (4) According to the material of the rollers, they are divided into steel rollers, cast iron rollers, hard alloy rollers, ceramic rollers, etc; (5) According to manufacturing methods, there are casting rolls, forging rolls, surfacing rolls, sleeve rolling rolls, etc; (6) According to the state of the rolled steel, there are hot rolling rolls and cold rolling rolls.

What are the performance requirements for rolling rolls

What are the performance requirements for rolling rolls

The main requirements for rough rolling rolls are usually strength and resistance to thermal cracking; The working roll weight of a small 20 high rolling mill is only about 100 grams, while the support roll weight of a wide and thick plate rolling mill has exceeded 200 tons. When selecting rollers, the main material for safe load-bearing capacity (various grades of cast iron, cast steel, or forged steel, etc.) should be selected based on the basic strength requirements of the rolling mill for the rollers.

Correct selection of rollers to meet production requirements

Correct selection of rollers to meet production requirements

Residual stress and thermal stress may occur during the preparation process before production and use of the roller. During application, it is further subjected to various cyclic stresses, including twists and turns, changes, shear forces, contact stresses, and thermal stresses. The distribution of these stresses along the roll body is uneven and constantly changing, not only due to planning factors, but also to the continuous changes in wear, temperature, and roll shape during the use of the roll.

Why do metallurgical cast steel rollers undergo high-temperature diffusion treatment?

Why do metallurgical cast steel rollers undergo high-temperature diffusion treatment?

During the solidification of cast steel rollers, the presence of dendritic crystals can cause intergranular segregation of alloy components. This segregation is caused by the inability to achieve sequential solidification of the upper and lower layers, inner and outer layers of the roller body during the solidification process.

Why should alloy cast steel rollers undergo spheroidization and annealing heat treatment?

Why should alloy cast steel rollers undergo spheroidization and annealing heat treatment?

The spheroidizing and annealing heat treatment of alloy cast steel rollers is mainly aimed at improving the cutting performance of the rollers, improving cutting efficiency, and preparing the corresponding microstructure for subsequent quenching treatment. Spheroidizing annealing treatment causes the carbides in the structure to transform from flake to spherical, which means that spherical or granular carbides are uniformly distributed on the matrix of ferrite, forming a spherical pearlite structure. The spheroidization temperature selected in production is generally slightly higher than the critical point of Ac1. If the temperature is too low, the required spheroidization time is too long, while if the temperature is too high, it will lead to the appearance of granular pearlite with varying particle sizes.

Why do alloy cast steel rollers undergo quenching heat treatment?

Why do alloy cast steel rollers undergo quenching heat treatment?

Quenching of alloy cast steel rolls is a heat treatment process in which the roll is heated to a critical temperature (Acm or Ac1), held for a relative time to fully austenitize, and then rapidly cooled to the bainite transformation zone at a cooling rate greater than the critical cooling rate, thereby obtaining the bainite structure in the working layer of the roll body.

What should be paid attention to when classifying and selecting rollers

What should be paid attention to when classifying and selecting rollers

The main working components and tools on a rolling mill that cause continuous plastic deformation of metal. The rolling roller mainly consists of three parts: the roller body, the roller neck, and the shaft head. The roll body is the middle part of the roll that actually participates in rolling metal. It has a smooth cylindrical or grooved surface. The roller neck is installed in the bearing and transmits the rolling force to the frame through the bearing seat and pressing device. The transmission end shaft head is connected to the gear seat through a connecting shaft, transmitting the rotational torque of the motor to the rolling roller. The rolls can be arranged in the form of two, three, four, or multiple rolls in the rolling mill frame.

Life and Flaw Detection Standards of Cold Rolling Rolls

Life and Flaw Detection Standards of Cold Rolling Rolls

The main steps in the manufacturing process of cold rolling rolls include melting, forging, heat treatment, processing, and inspection. During the working process, cold rolling rolls must withstand significant rolling stress. In addition, problems such as weld seams, inclusions, and edge cracks in the rolled parts can easily lead to instantaneous high temperatures, causing strong thermal shock to the working rolls, causing cracks, sticking, peeling, and even scrapping. Therefore, cold rolling rolls should have the ability to resist cracking and peeling caused by bending stress, torsional stress, and shear stress, as well as high wear resistance, high contact fatigue strength, high fracture toughness, and thermal impact strength.

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