Stamping presses ranging from 250 tons to 2000 tons are mostly used in progressive or transfer stamping. HE-machine's full-functional coil feeding line is an ideal match for large-tonnage presses in automotive stamping. It can handle high-strength steel with a maximum width of 1800mm and thickness of 12mm.

Applicable Material

• Material Type: High Strength Steel, Cold-Rolled Metal Coil, Pickled Metal Coil, Galvanized Metal Coil, Stainless Steel Coil etc.

• Material Thickness: 1.0-12mm

• Coil Width: 90-1800 mm

• Yield Strength: ≤700 N/mm2

• Tensile Strength: ≤980 N/mm2

Coil Feeding Line Structure

1. Coil Car

2. Uncoiler Machine

3. Coil Threading Support

4. Straightener-Feeder

5. Hydraulic Shear

6. Automatic Lubrication Unit

7. Tailout Support Bracket

8. Stamping Press 250-2500ton

Coil Feeding Line Features

Fully Automatic, Hands-Free Coil Loading and Threading

After setting metal coil specifications via the touch screen console, all subsequent processes are electrically controlled by the coil feeding line, requiring no manual operation.

Automatic Coil Loading with Self-Centering System

The coil car loads the metal coil onto the uncoiler spindle with self-centering. The limit rolls then close automatically, and the hold-down arm lowers electronically with calculated pressure.

Automatic Coil Threading

After uncoiling, the metal coil is automatically fed into the straightener, with photoelectric sensors for loop control—no manual intervention needed.

Electric Straightening Value Adjustment

Straightening values, which require precise adjustment based on material thickness and strength, are set via the touch screen control panel without hand-wheel operation.

Automatic Transfer to Inching Mode

When a coil is nearly exhausted, the pass-through detector sends a stop signal to the stamping press and automatically switches to inching mode.

Backup Rollers

To prevent edge defects caused by overloaded straightening rolls, HE incorporates backup rolls in coil feeding lines—ideal for high-strength materials or wider coils.

The straightener features frames with top and bottom backup rolls. These rolls bear separating force loads to enhance straightening performance.

Smart Straightening Adjustment

HE pre-sets straightening values based on coil specifications during installation of the coil feeding line.

A coil’s inner surface (around the ID, typically 400mm–610mm) is compressed, while its outer surface (around the OD, typically 800mm–1800mm) is stretched. This inner-outer diameter difference requires variable straightening adjustments.

HE’s self-developed straightening program automatically adjusts values during coil processing, eliminating the need for operator intervention.

Openable Upper Rolls for Easy Cleaning and Upgrades

For materials like high-strength steel (HSS) and aluminum, which may leave scraps on straighteners, HE’s straightener head is openable—facilitating roll cleaning and future upgrades

Coil Feeding Line Main Parts (GLK4-1600H as reference)

1. Coil Car

This coil car has two functions. One helps metal coil load to the uncoiler spindle, and another one is helping the material head enter into straightening parts smoothly. When loading the metal coil with a narrow width, there are moveable baffles to avoid coil dump. The coil car has four guide columns load-bearing, and the coil contact surface is roller type. A hydraulic motor with chain transmission drives the two rolls.

• Roller type surface

• Lifting distance: 350 mm

• A hydraulic cylinder drives the coil car lifting with pressure maintaining valve for smoothly lifting

• A hydraulic motor drives the coil car movement, with a throttle valve for speed control

• Traveling distance: 2500 mm

• Moving speed: 8m/min (speed adjustable)

• Offside preventing: Limit switch and limit device

• Moveable handle or touch screen panel control

• Centering: Automatic self-centering

2. Uncoiler

Uncoiler machine uncoils the metal coil to metal strip, then feed the piece into the straightener-feeder machine. It rotates intermittently to release the metal strip. An uncoiler contains spindles, coil hold-down arm, coil guide limit arm and loop control parts, etc. This uncoiler has a maximum loading capacity 15ton, with support cantilever structure. And the coil feeding line has three groups of hydraulic wedged structure for uncoiler spindle expansion.

Spindles motor: AC motor 11KW, with frequency converter
Spindles transmission: Variable frequency motor, double row, and large pitch chain drive
Spindles brake: Cylinder disc brake
Uncoiling Direction: Clockwise
Spindles support cantilever: Hydraulic spindle support

Coil hold-down arm: Add pressure on the coil to avoid strip lose during uncoiling process
Coil hold-down arm material: Polyurethane rubber wheel, 180mm width
Coil hold-down arm drive mode: Motor-driven
Coil hold-down arm speed adjustment: Speed regulation (refined pulse) by angle encoder feedback signal

Coil guide limit arms: Coil guide limit arms have two rollers. The inside rollers have a fixed angle, and the outer rolls can be open or close by air cylinder drive. When the two rollers are closed down, the metal coil will be fixed between two rollers, to prevent loop misguide. After coil uploaded on the uncoiler mandrel, the two rolls will be moved with self-centering to meet the setting coil width. The two rollers are non-motorized with free rotation, and the surface is black phosphorus treatment.

3. Coil Threading Support

After uncoiling process, the support rollers on the coil car will guide the material to coil threading support part. The coil threading support device has a swing arm with an upper inlet roller, driven by a hydraulic cylinder. When the material head reaches the straightener head, it will be detected. Then the swing arm will close automatically to hold-down material. The bottom inlet roller is geared transmission, sharing drive power with straightener rollers. When upper inlet roller goes down, the two rollers clamp the metal strip and send it to the straightening part. These two rollers are made by high quality bearing steel, with sandblasting treatment, hardness reaches HRC60±2.

4. Straightener Feeder

The straightener-feeder part of coil feeding line leveling the coil set and feed it into stamping press in a fixed quantity. It has two inlet pinch rolls, both of them are motorized, which can clip the sheet strip and avoid material scratch.

• Rollers combination: Straightening rolls 9pcs, backup rolls 5groups, feeding rolls 2pcs

• Rollers material: Gcr15 high carbon chromium bearing steel, hardness reach HRC60±2

• Rollers transmission: Side gear drive, ISO 6 precision standard gears

• Straightening rollers: 9pcs (up5/down4), bearing steel with thick plated hard chrome grinding surface treatment

• Straightening rollers support: Deep groove ball bearings

• Straightening rollers release: Pneumatic release

• Backup rollers: 10 groups, up5 groups/down5 groups

• Backup rollers support: Needle bearings

• Pinch rollers: 2pcs, two outlet pinch rollers will feed the leveled strip into stamping press after straightening.

• Straightener-feeder part drive: AC servo motor drive, with mechanical transmission

• Straightener-feeder part power: 30Kw

• Straightening setting adjustment: Electric adjusted by gear motor, setting accuracy 0.1mm, with touch screen control and automatic memory function.

• Straightener setting display: Displayed by touch screen, eccentric shaft end with a dial for reference

• Straightening precision: mm/m²≤0.15mm

• Feeding accuracy: Feeding length 0-500mm, feeding accuracy ±0.15mm/m; Feeding length 500-1000mm, feeding accuracy ±0.20mm/m

• Feeding line height adjustment: Electric adjust, 1250±100mm

5. Hydraulic Shear (Option)

A hydraulic shearing unit is used to cut the material heads and tails for productivity improvement and better stamping product quality. The hydraulic shear used in HE coil feeding line has four sides scissors to achieve smooth cutting.Moreover, when the material crack in the stamping dies, a hydraulic shear can cut the strip loop for a quick repair and maintain.It’s operated by touch screen control and with manual scissors adjustment.

6. Automatic Lubrication Unit (Option)

Lubrication of steel strip before stamping will protect the stamping dies. The HE automatic lubrication system is automatically controlled, with an oil loop recycling system, which will save oiling cost and prevent leakage.And HE provides wool felt roller type and rubber roller type for optional to meet the different requirements of specific material type.

7. Coil Feeding Line Tailout Support Bracket

An outlet support bracket is used to help the metal strip delivery to press die smoothly. When the coil material is in thin thickness, and there is lots of space between straightener-feeder and stamping dies, the strip will move up and down to affect the stamping quality. An outlet support bracket can avoid this problem. And the length of the support bracket is adjustable to fit different dimensions of stamping dies.