Coil Feeding Machine FAQ

What is the advantages of compact coil feeding line decoiler straightener feeder?

Most metal raw materials used in sheet metal stamping companies are the coil type. A metal coil must be uncoiling and levelled to eliminate internal stress, then fed into the stamping press machine. 

The loop type coil feeding lines usually require two or more independent equipment to be used together, comparing with loop type coil feeding line, the combined decoiler straightener feeder coil feeding line has many advantages:

1. Modular control, simple coil handling operation

A compact coil feeding line is not only a simple combination of uncoiler, straightener, and feeder but also highly integrated control in operations. The hydraulic station, coil car, uncoiling motor, spindle and inverter, straightener part, servo feeder motor are connected with the PLC modular system and controlled by one touch screen, which is quite convenient for operators.

2. High precision straightening and feeding performance

For a loop type coil feeding line, there will be a material loop between each two equipment, means all of them need an inverter for speed control, even so, the running match will not be fully synchronized, which will affect the precision of feeding. A decoiler straightener feeder coil feeding line can synchronize these three parts, has control of PLC closed-loop system, which ensure a high servo feed accuracy.

3. Wide range of metal coil processing applications

The application range of decoiler straightener feeder coil feeding line is much wide than other types. It can handle high strength steel and also normal steel in high thickness. It can handle steel thickness up to 12.0mm coil width up to 1800mm with high precision straightening performance. A compact decoiler straightener feeder coil feeding line is necessary for the high strength steel stamping in automotive, construction, aerospace or electrical appliance manufacturing.

4. Save workspace, easy installation and maintenance

The compact coil feeding line is easy to install, which can enter into mass production in a short time. Without a long material loop, the coil feeding line length is usually no more than 5m,  some models such as GLK2 is only 2.5m length, which will save workplaces of stamping room. With international brand core components, automatic lubrication system and self-inspection procedures, the compact coil feeding line have a very low failure rate and easy to maintenance.

Compact coil feeding line (Servo straightener feeder with uncoiler) is HongEr’s major product: GLK2 series for thin material handling, GLK3 for medium thickness steel coil processing, GLK4 for the thick coil thickness up to 6.0mm, GLK5 series for heavy-duty steel thickness up to 9.0mm, and also GLK-H series for high strength steel stamping. HongEr also provides customized coil handling solutions according to specific sheet metal coil processing.

What will cause the inaccurate feeding of the servo feeder? How to solve the feeding accuracy problem?

Inaccuracy feeding occasionally happens in sheet metal coil  feeding process. There are various reasons that caused the feeding accuracy problem, HongEr summarized the main causes and solutions for the inaccurate feeding of NC servo feeder.

Uneven feed roller pressure

The sheet metal coil will be always biased in one direction because of the uneven feed roller pressure, which will cause inaccurate feeding.

Solution: If the coil sheet always biased to the left, it means the pressure on the left is too large. At this time, turn the left pressure adjustment nut counterclockwise to reduce the left spring pressure until the material runs back to the correct position, or turn the right pressure adjustment nut clockwise to increase the right side spring pressure.

Material deformation

The coil material is too soft and easy to deform will also cause inaccurate feeding, such as copper, aluminum. Excessive pressure on the upper roller causes soft material deformation and bias. The coil sheet will sometimes go to the left side and sometimes go to the right side. 

Solution: Please unplug the lower tube of the release air cylinder and fold it up. If the material is still deformed, please rotate the two pressure adjustment nuts counterclockwise to release the pressure. It’s very important for us to know your coil material kind before produce a servo feeder machine. Please confirm your feeding material with our sales before purchasing. 

Coil material uneven or burrs

The thickness of the two sides of the material is different or the material has severe burrs, will cause the material to always be biased to one side when feeding.

Solution: Adjust the pressure adjustment nut and change the inlet locating wheel to the inlet locating plate. Otherwise, it can only be solved by replacing the materials.

Machining or assembly failure

Wrong machine processing or assembly will also cause inaccurate feeding. This problem doesn't happen in HongEr servo feeders yet, if any fault of our servo feeder, please contact us now to solve the problem in time.