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Leveling

Leveling is a crucial process in the fabrication of special steels. It is used to eliminate or reduce internal stresses in steel plates, particularly high-carbon and wear-resistant steels, in order to achieve a flat surface.

This process not only enhances the workability of high-carbon and wear-resistant plates but also improves the quality and precision of the final product. Internal stresses in steel plates, caused by uneven cooling or manufacturing procedures, can result in deformation or warping, which negatively impacts subsequent processing and applications. Steel leveling employs various techniques to effectively resolve these issues, ensuring that steel plates maintain excellent performance and quality in manufacturing applications.

Out-of-flat sheets with internal stresses impair efficiency

If internal stresses in steel plates are not properly managed, they can negatively affect various applications, such as:

  • Gardening Tools: Pruning shears, lawn care tools, and other gardening implements require high strength and dimensional stability. Internal stresses in the steel may cause these tools to deform or break during use, reducing their lifespan and efficiency. For example, the blade of a pair of scissors may lose precision if the steel warps, leading to poor trimming performance.
  • Cutting Tools: For palm-harvesting tools, such as oil palm sickles, internal stresses in the steel plate can compromise precision and performance. These tools must maintain stable geometry and sharp edges in service. Residual stresses can cause uneven wear or deformation, reducing cutting effectiveness and overall quality.

Main Steel Leveling Technologies

The main techniques for steel leveling include:

  • Mechanical Leveling: This method applies pressure through mechanical devices, such as roller levelers, to correct the flatness of steel plates. It is suitable for large-scale production and effectively eliminates warping and bending.
  • Heat Leveling: In this method, steel plates are heated to a specific temperature and then cooled to relieve internal stresses. It is especially suitable for thick or high-strength plates, helping to restore flatness.
  • Cold Leveling: This technique uses mechanical means to level steel plates at room temperature. It is ideal for thin plates or applications requiring high precision. Cold leveling allows for better control of surface quality and dimensional accuracy.
  • Ultrasonic Leveling: This method employs ultrasonic vibrations to release internal stresses in steel plates. Although more costly, it provides higher precision, making it suitable for applications that demand extremely high flatness.

Among these methods, mechanical leveling with roller levelers is the most cost-effective and efficient in terms of performance, as outlined below.

Roller Leveler Working Principle

The roller leveler is one of the most widely used devices for steel leveling. Its working principle can be summarized as follows:

  • Roller Configuration: A roller leveler consists of multiple rollers arranged in a staggered pattern. As steel plates pass through the rollers, pressure is applied to relieve internal stresses.
  • Pressure Adjustment: The spacing between rollers and the applied pressure can be adjusted to control the degree of bending. Rollers with different diameters and surface finishes are used to accommodate various steel types and thicknesses.
  • Bending and Correction: As the steel plate travels through the rollers, it undergoes repeated bending and correction. The roller configuration ensures continuous pressure, gradually eliminating internal stresses and achieving a flat surface.
  • Automated Control: Modern roller levelers are typically equipped with automated control systems that monitor and adjust operations in real time. These systems ensure that flatness requirements are met while enhancing production efficiency and product quality.
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