Understanding Cut-to-Length Lines
What is a cut-to-length line?
This cut-to-length line, also known as a coil slitting line, drop line or CTL, is designed to unroll and flatten steel coils, then cut them to the desired width or length and backflush them to achieve the final profile. Line handling with wide coils is typically equipped with quick tool change systems to accommodate different cutting applications, uncoiler and backflushes systems and collection systems to stack sheet products into bundles. High-performance slitters are used in fixed-length cutting lines, which are typically circular cutters that handle a variety of rolled metal coils and efficiently cut them to precision lengths.
Slit steel manufactured by fixed-length cutting lines is rolled steel that is cut to a specific length by a master coil, also known as a slit-to-width coil.
Typically, a fixed-length cutting line consists of three main components, the decoiler, slitter and backflushes. As the production cycle begins, the rolled coil is fed and flattened through the decoiler system, thereby eliminating defects on the coil surface.
Slit steel manufactured by fixed-length cutting lines is rolled steel that is cut to a specific length by a master coil, also known as a slit-to-width coil.
Typically, a fixed-length cutting line consists of three main components, the decoiler, slitter and backflushes. As the production cycle begins, the rolled coil is fed and flattened through the decoiler system, thereby eliminating defects on the coil surface.
In the next stage, the flattened material is loaded onto a cleat between the circular cutting wheels, which are mounted on the top of the slitting system and the
bottom. The slit-to-width coils are then rewound by the recoil equipment. To achieve ideal coil slitting and forming, the machinist must determine if the mandrel size, tool kit, tool change system, horsepower, and tensioning device are appropriate for the material and application specifications.
Coil length cutting process
● Unwinding.
Coil length cutting process
● Unwinding.
The uncoiling process in a decoiler system begins with the automatic feeding of the steel coil or master coil into a double cone or expanded mandrel single end decoiler. The double cone type of the decoiler is better suited for heavy duty applications, while the multi-purpose mandrel type is an excellent solution for both light and heavy loads.
Rolled coils are fed into the cone via a trolley ramp and quick-load coil carriage
body. Raw material is loaded into the de-coiler cone by means of a pusher ramp and a quick-load coil cart. The loading cart screws the mandrel into the inner diameter of the main coil material and then rotates it off the cone or mandrel.
The material will be stripped to allow the coil head to enter the edge guide smoothly before the straightening tool
track. The flattening operation of the coil is especially important when the flatness of the coil and the absence of defects on the surface of the material are critical in further coil processing.
● Cut length.
● Cut length.
In this stage, the uncoiled material is loaded into the slitting system, which consists of two parallel mandrels with knives cutting under rotation. The cutting knives will partially enter the coil, causing cracks or breaks on both sides of the steel. The sheets, cut to length, will then separate from one to the other. Many applications require peel rings to provide a more desirable edge and to eliminate any burrs and defects that may interfere with downstream operations.
After precision cutting, the outer edges of the product have edge trimming that needs to be performed by a scrap winder
processing. In some cases, the product being cut is so thin that the machinist can utilize a recirculation pit. This may take up different thicknesses of the slit width coils, especially when the edges are significantly thinner than the center section. The circulation pits mentioned here can also manage additional volume prior to the tensioning stage.
Typically, the tensioning is used in the slitting line prior to the rewinder system frame.
Why do I need a cut-to-length line?
Why do I need a cut-to-length line?
First, the high performance round knives in a cut-to-length line are rigorously manufactured and machined to cut steel coils with minimal burr, making the cut-to-length line a reliable system for producing high quality sheet products with precise lengths.
Second, a cut-to-length line with precision cutting capabilities can effectively reduce material costs and production time.
In order to complete the production of slit-to-width coils, manufacturers no longer need secondary coil handling equipment, and the entire production cycle, including the flattening and back-punching processes, can be completed on the cut-to-length line. On the other hand, sheet customers can find coils in standard and exact widths or lengths.
Last but not least, the cut-to-length line for steel coils offers a high level of automation and simple operation.
This makes the system easier to operate, monitor and maintain, increasing reliability and accuracy as well as productivity.
This makes the system easier to operate, monitor and maintain, increasing reliability and accuracy as well as productivity.
Automatic feeding of the decoiler system and high precision stacking tools allows further upgrades to the cut-to-length line for efficient operation.
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