How Does High Speed Precision Slitting Line Work?

Posted on Jan 4, 2021

High Speed Precision Slitting Line

The highly automated precision slitting lines with these systems are efficient and advantageous for high volume slit-to-width coil production, since there is no need for finishing work or additional operations completing on other tools. 

The function of High Speed Precision Slitting Line

High speed precision slitting line is the metal strips automatic handling machine, which is designed for critically unrolling the wide coils, and cutting them to a precise length at a high speed. Using the circular slitters, which are critically designed and made, the high speed precision slitting line provides simple setups, and fast, reliable cuts, making it popular in the metalworking industries requiring metal sheets handling applications.

Most of the high speed precision slitting lines, in addition to shear the steel strips, also employ uncoiling units and recoiling units to produce customized steel coil products like stainless sheets and plates without secondary operations on other machines. To speed up the entire production cycle and also increase the reliability, the high speed precision slitting lines are often equipped with automated feeding and tool changeover system, as well as stacking units, optimizing the production of the slit-to-width coil.


How Do High Speed Precision Slitting Lines Form?

Most high speed precision slitting lines consist of 3 primary systems for three main coil handling stages, including the uncoiler, the slitter, and the recoiler, contained in a single slitting line machine. As mentioned, the highly automated precision slitting lines with these systems are efficient and advantageous for high volume slit-to-width coil production, since there is no need for finishing work or additional operations completing on other tools. 

The metal sheets that being cut in the high speed precision slitting lines are generally aluminum sheets, stainless steel sheets, or other heavy gauge materials, the slit-to-width sheets are widely known as the slit mults, which is referred to the products that have already been precisely measured and cut to the required specifications.

The basic production cycle of the slit-to-width coils or mults involves the loading process in the beginning, which feeds the raw material to the uncoiling system to remove the surface defects and straighten them, ensuring the ideal surface qualities. At the next stage, the metal strips will pass through the nip between the circular slitters, also called the slitting wheels, then be cut to the desired length or width extremely accurately and efficiently. 

Optionally, the slit-to-width metal coils will be finished and re-wounded by the recoiler to form the unique profiles, then the products will be collected. Following is the detailed introduction to process how the high speed precision slitting line functions.

:: Read more: An Introduction to Precision Slitting Line


How Do High Speed Precision Slitting Lines Work?


● Uncoiling Process

The raw material is typically automatically fed to the uncoiler via a loading car or robotic feeder in a high speed precision slitting line machine today. Most precision slitting lines use the expanding mandrel, single-end type uncoiler, which is greatly suitable for both light-duty and heavier loads, but there are some slitting line machines that utilize the dual cone type unrolling devices that are more often used for heavy load applications.

Under computerized control, the coil car threads the mandrel with the inner diameter of the master coils, rotating the raw material strips off the mandrel or cone and peeling off the coils to improve the smoothness. As a result, the uncoiling system can improve the surface quality of the metal strips for downstream operations.

In high speed precision slitting lines, the expanding mandrel uncoiler is generally used for handling metal coils that have a width ranging from 40 to 60 cm without any filler plates. In some cases that the raw materials have greater inside diameters, filler plates with specific designs and filler rings are handy. 

Loading and unloading these filler plates take more downtime, affecting the overall efficiency, therefore the user of the high speed precision slitting lines should identify the requirements of applications and the specifications of the equipment to take full advantage of the precision-cut to length line machines.


● Cut-to-length Process

After improving the surface smoothness, the steel strips need to be shear to a precision length at the cut-to-length stage. The cutting area in a high speed precision slitting line machine is built with two parallel arbors and rotary circular slitters which are critically manufactured. As the slitting wheels partially advance into the metal strips, the slitter will create cracks and fractures, then the steel coils will be sheared to the desired length with high precision.

At this stage, the metal strips will be separated from one to another, being ready for further handling or forming processes like tensioning, recoiling processes. Since the metal coils’ outside edges will generally have edge trims or other defects, the slit-to-width coils require treatments to improve the quality and the appearance of the coiled products.


● Edge Trim Handling and Tensioning Process

There are a wide variety of edge trim scrap winders and rubber strippers that are helpful for the high speed precision slitting line machines to handle the edge trims of the coils after cutting. The scrap winder can pull the generated scraps under the cutter head’s tension as the high speed precision slitting line machine runs. When mounting the scrap winders in pairs to maintain the tension on each scrap strands, the scrap winder is effective and efficient for medium applications have a thickness up to 0.25 inches 

When the metal coils have a significantly larger thickness in the center parts but have thinner edges, tensioning devices like tensioning stands are required to handle the varying thickness of the master coils. Otherwise, the center parts of the master coils will be taken up too fast while the edge sides are hung loosely, resulting in poor quality products eventually.


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