Automatic Metal Slitting Line for Precision Coil Processing 0–20 m/min

The High Speed Metal Slitting Line is an automated coil processing system developed for manufacturers that need to divide wide metal coils into multiple narrow strips with stable accuracy and reliable rewinding performance. The complete line combines decoiling, leveling, slitting, scrap winding, tension control, and recoiling into one continuous production process.

It is suitable for processing carbon steel, galvanized steel (GI), and pre-painted galvanized steel (PPGI) with material thicknesses from 0.3 to 0.8 mm and a maximum coil width of 1250 mm. In addition to longitudinal slitting, the equipment can also operate as a cut-to-length machine, providing greater flexibility for different metal processing requirements.

Complete Coil Slitting and Cutting System

The steel coil slitting machine is configured as an integrated production line rather than a single slitting unit. The incoming coil is first loaded onto a 6-ton electric decoiler, then guided through the leveling and slitting sections before being separated, tensioned, and rewound.

The main components include:

• 6-ton electric decoiler

• Feeding and guiding system

• Coil leveling unit

• Precision slitting unit

• Hydraulic cross-cutting system

• Scrap edge winder

• Strip damping and separation system

• 6-ton hydraulic recoiler

• Hydraulic loading car

• Hydraulic station

• Delta PLC control system

This integrated configuration reduces unnecessary manual handling and allows the entire coil processing operation to be controlled through one production line.

Technical Specifications

Item	Specification
Machine Type	High Speed Metal Slitting Line
Processing Materials	Carbon Steel, GI, PPGI
Material Thickness	0.3–0.8 mm
Maximum Coil Width	1250 mm
Decoiler Capacity	6 Tons
Decoiler Type	Electric Decoiler
Coil Inner Diameter	450–550 mm
Slitting Blades	12 Pairs
Slitting Shaft	50 mm Solid Shaft
Leveling Rollers	8 Upper + 9 Lower
Processing Speed	0–20 m/min
Scrap Winder	2 × 2 kW Torque Motors
Recoiler Capacity	6 Tons
Recoiler Shaft Length	1400 mm
Recoiler Coil ID	450–610 mm
Hydraulic Motor	5.5 kW
PLC	Delta
Control Languages	English, Chinese, Lithuanian
Length Accuracy	3 m ± 1.5 mm
Slitting Blade Material	Cr12MoV
Cross-Cutting	Hydraulic
Control Method	Touchscreen + Buttons

6-Ton Electric Decoiler

The production process begins with a 6-ton electric decoiler designed to support the master coil and provide controlled material feeding.

The decoiler uses automatic motor transmission together with a mechanical press arm. This configuration helps maintain stable coil feeding and reduces the possibility of material deformation during unwinding.

The supported coil inner diameter is 450–550 mm, making the decoiler suitable for the specified range of steel coils used by the production line.

Leveling System for Stable Material Feeding

Before slitting, the metal strip passes through the leveling section.

The machine is equipped with 8 upper leveling rollers and 9 lower leveling rollers. The leveling rollers straighten the material and reduce the curvature created during coil winding.

The frame uses welded 350H steel, while the main shafts are manufactured from 45# steel. After heat treatment and hard chrome processing, the shafts provide improved durability for continuous production.

A stable leveling process is important because the quality of the incoming strip directly affects slitting accuracy and the final coil shape.

Precision Slitting with 12 Pairs of Blades

The slitting unit is equipped with 12 pairs of slitting blades, allowing the master coil to be divided into multiple narrower strips according to the required production width.

The blades are manufactured from Cr12MoV, providing suitable hardness and wear resistance for continuous metal coil processing.

The blade arrangement can be adjusted according to the customer's required strip widths. This allows the same machine to handle different production orders without requiring a completely separate slitting system.

The main slitting shaft is a 50 mm solid shaft, providing stable support for the blade assembly during operation.

Scrap Winding System

During longitudinal slitting, narrow edge material is generated as scrap. The integrated scrap winder collects this material instead of allowing loose strips to accumulate around the production area.

The scrap winding system uses two 2 kW torque motors and a guiding mechanism to organize the waste strips during operation.

It is particularly designed for edge scrap with widths of approximately 20 mm or less.

This arrangement helps maintain a cleaner working area while making scrap collection and subsequent handling more convenient.

Hydraulic Recoiler for Finished Coils

After the material is slit, the separated strips pass through the damping and separation section before entering the 6-ton hydraulic recoiler.

The recoiler winds the individual strips into finished coils while maintaining appropriate winding tension. Adjustable tension is particularly important when processing thin-gauge steel because insufficient tension can result in loose or irregularly formed coils.

The recoiler is equipped with:

• 6-ton loading capacity

• 1400 mm shaft length

• 450–610 mm recoiler coil ID

• Hydraulic drive system

• Hydraulic loading car

The loading car uses a V-shaped lifting platform to assist with removing and transferring finished coils from the recoiler.

Strip Separation and Tension Control

A dedicated damping system is positioned before the recoiler to help separate the slit strips and establish suitable back tension.

The damping section includes a:

• Pre-separation shaft

• Arch structure

• Pressure shaft

• Pneumatic damping mechanism

• Felt pads

Operators can manually adjust the tension according to the material and production conditions.

Proper tension control helps improve strip separation and contributes to more orderly finished coils, especially when working with relatively thin metal materials.

PLC Control and Flexible Operation

The metal coil slitting line uses a Delta PLC, inverter, and touchscreen control panel to manage the main production functions.

Operators can set parameters such as:

• Cutting length

• Production quantity

• Operating parameters

• Length correction

The system provides automatic length measurement and quantity counting, while the touchscreen allows operators to make adjustments during production.

A foot pedal with an extended cable is also provided for convenient start and pause operation.

The material entry section incorporates vertical side rollers to help maintain proper alignment before the coil enters the leveling and slitting system.

Slitting Mode and Cut-to-Length Mode

One of the practical features of this steel coil processing line is its ability to perform different processing operations.

When narrow strips are required, the machine can operate in its normal slitting and recoiling mode.

When the customer needs flat sheets instead of slit coils, the equipment can switch to cut-to-length mode. In this configuration, the slitting and recoiling functions can be stopped, while the main slitting shaft can be lifted away from the material path.

This means one production line can serve both coil slitting and sheet cutting requirements without requiring completely independent equipment.

Applications of the Metal Slitting Line

The High Speed Metal Slitting Line can be used in various metal processing industries where wide master coils need to be converted into narrower strips or fixed-length sheets.

Typical applications include:

• Steel service centers

• Metal coil processing companies

• Roofing material manufacturers

• Wall and panel manufacturers

• Construction material producers

• Downstream roll forming production

• General sheet metal processing

The machine can process:

• Carbon steel coils

• Galvanized steel coils

• PPGI coils

• Thin-gauge metal coils

• Materials requiring slitting and cut-to-length processing

Why Choose This Steel Coil Slitting Machine?

For manufacturers processing thin and medium-width steel coils, the machine provides several practical advantages.

Integrated Production:
Decoiling, leveling, slitting, scrap winding, tension control, cutting, and recoiling are combined into one production line.

Flexible Processing:
The equipment can perform longitudinal slitting as well as independent cut-to-length processing.

Stable Slitting:
The 50 mm solid slitting shaft and Cr12MoV blades provide stable support for continuous slitting operations.

Controlled Rewinding:
The hydraulic recoiler and damping system help maintain more consistent strip tension and coil formation.

PLC Automation:
The Delta PLC and touchscreen control system simplify parameter setting, measurement, counting, and operation.

Reduced Manual Handling:
Automated coil feeding, scrap collection, and finished-coil handling help improve the overall production workflow.

The High Speed Metal Slitting Line provides a practical solution for manufacturers that need to process wide steel coils into narrow strips or accurately cut sheets. With a maximum material width of 1250 mm, thickness range of 0.3–0.8 mm, 12 pairs of slitting blades, a 6-ton decoiler, and a 6-ton hydraulic recoiler, the line is designed for flexible coil processing.

Its combination of precision slitting, leveling, scrap winding, tension control, hydraulic recoiling, and PLC automation makes it suitable for steel service centers, roofing manufacturers, panel producers, and other downstream metal processing applications.

For customers who need both coil slitting and sheet cutting capabilities, the optional cut-to-length operating mode further increases the versatility of the production line.