Introduction Of Uncoiler

The uncoiler/decoiler is mainly used with punching machine, shearing machine, laser cutting machine and cold bending forming machine to realize the automatic production of coil material. According to the relevant equipment, it can form a production line for uncoiling, leveling, feeding (cutting) to meet the needs of the stamping workshop, and is suitable for auto parts, metal products, household appliances, construction hardware and other industries.

uncoiler machine

The metal sheet coils uncoiler is one of the most important equipment in the stamping production line. One of its functions is to support the steel coil by tightening the inner hole of the steel coil, and the other is to send the steel belt head to the leveler by rotating the straight head. Therefore, the performance of the uncoiler is very important to the whole production line. In many years of design practice, the structure of the uncoiler has been optimized and improved so that the performance of the uncoiler has been improved.

Classification Of Uncoiler

With the subdivision of the industry, there are more and more types of uncoilers. According to different products, we can roughly classify the uncoiler according to five types.

1.Uncoiler Machine

Standard uncoiler, with many types of models and a high degree of customization. It can be used for both unwinding and winding.

uncoiler machine
hydraulic uncoiler

2.Hydraulic Uncoiler Machine

This is a large, heavy-duty roll carrier, usually with rolls weighing more than 2 tons. Like the standard uncoiler, it is easy to operate and is also used for unwinding and rewinding continuous strips.

3.Small Uncoiler Machine

It is mainly used for uncoiling of light and thin plate materials, and there are only two models of CR-100 and CR-200. Of course, it can also be used for rewinding purposes, but it is mainly for scraps when rewinding.

small uncoiler

4.Disc Uncoiler Machine

The disc uncoiler, also known as the flat electronic feeder, is a type of horizontal uncoiler.It is mainly used for the unwinding of thin plates and narrow materials, and it is used with high-speed punching machines, and cannot be used for rewinding.

5.Double Head Uncoiler Machine

At present, it is mainly used with S-type high-speed leveling machine, high-speed gear feeder and high-speed punching machine, such as the production of stamping motor stator and rotor.

The double-head uncoiler is a fast-changing device specially developed, produced and manufactured by Henli to replace the uncoiler. It has two expanding and shrinking reels, which can place two reels at a time. When one reel is used up, the other reel can be connected immediately. It can be achieved without downtime, ensuring the continuous production of the stamping production line, greatly reducing the time for refueling and debugging, and improving the production efficiency.
At present, double-head decoilers are generally used in high-speed stamping production lines.

Uncoilers are generally divided into these five types, standard uncoilers, hydraulic uncoilers, small uncoilers, disc uncoilers and double-head uncoilers. Each model can be subdivided into many specific models according to the width, thickness, load, inner diameter and outer diameter of the applicable material. Therefore, the price needs to be determined after selecting the model according to the properties of the coil material and the characteristics of the process.

So, how to choose a uncoiler suitable for stamping needs? 

There are generally three steps to determine a uncoiler that suits you.

1.Identify the basic parameters of the material, width, thickness, weight, inner diameter, and outer diameter of the material.

You can roughly know the type of uncoiler/decoiler you need by first clarifying the basic properties of the material.

2.Understand your own processing and production situation to choose the configuration of the uncoiler/decoiler.

a.Choice of unmotorized  and motorized models

Motorized Mode

① Unmotorized Model (with Brake Device)

②Motorized Model (with control Panel)

Unmotorized Model: Usually only used for unwinding, rarely used for rewinding. It is basically used in some special fields, such as the punching of shelves, silicon steel sheets and EI sheets with punching machines, or special use with cold bending forming machines.

Features: It can save the floor space (no need to reserve a large waiting area), but the machines used together need to have a lot of traction, and the uncoiled material should not be too thin (too thin will strain the material).


Motorized Model: It can be used for uncoiler or rewinder, and most of them are used together with punching machine, shearing machine, hydraulic press, cold bending forming machine, laser cutting machine, etc. It can independently unwind coils of various widths and thicknesses, and has a high degree of customization.

Features: It is a commonly used model, and has a high degree of customization, a wide range of adaptations, and is easy to match with other machines.

b. Frequency control configuration

This function enables the decoiler to freely adjust the speed according to the demand, increase the stability of the decoiler, make the material strip discharge more smoothly, and reduce jitter.(For example, when the customer uses the decoiler with the leveling machine, because of the frequency converter speed regulation, it will be relatively stable at startup, and the material will not be stretched and bent due to sudden startup.And it is relatively stable when stopped, and the material will not be loosened due to the inertia of the coil. )

Frequency control configuration
Cylinder pressing arm device

c. Cylinder pressing arm device

The cylinder pressing arm is to press the outer ring of the material to avoid the problem of bulk material when the coil is uncoiled. Usually when the thickness of the material exceeds 2mm, it can be recommended to customers.

d. Adjustment of inner and outer diameters

The inner diameter of the international coil is 508mm and the outer diameter is 1200mm.

The inner diameter range is 450-530mm, and the maximum outer diameter is 1200mm. If it is not in this range, it needs to be customized.

Hydraulic expansion device

e. Hydraulic expansion device

This device is installed on the decoiler to replace the standard manual expansion device, which ensures that the decoiler can be fully stretched and at the same time reduces the labor intensity of manual expansion. Usually, when the weight of the coil is 3 tons, it can be recommended to customers. (Of course, some customers also use it when it is less than 3 tons in order to save labor.)

f. Hydraulic loading trolley

It is recommended for customers to use when the weight of the coil exceeds 3 tons or the material is very wide.

Hydraulic loading trolley

g. Photoelectric induction device or proximity switch induction device

Used to replace standard touch sensor rods for unwinding non-conductive or film-coated materials. (If the customer is this material, this configuration needs to be adopted)

Of course, some devices can also be selected to make the uncoiler use better. Here, I will also introduce them one by one, so that you can understand the mystery of the uncoiler.

2.1.If the coil weight is more than 10ton, then need to add a spindle head support, which is adjusted by manual, or you can choose by lifting reducer. If more than 15ton, then need to change by hydraulic adjustment.

3. Clarify the size of your own production workshop, as well as the model and processing technology to be matched with the uncoiler in the future.

Because it is necessary to consider whether it needs to be matched with other models and processing technologies in the future, this will have further requirements on the uncoiler.Whether there are requirements on the surface of the material, if the surface of copper and aluminum needs to be coated, an additional coating device needs to be added at this time. If it is determined that the material needs to be covered, it is necessary to use variable frequency speed regulation to prevent the material from being pulled.

Because there are various production situations and needs, it is difficult for customers to consider them comprehensively. Therefore, the selection of the decoiler is very important, and it must be selected according to the needs, so as to truly ensure that it meets the needs of the post-processing technology.
So before deciding to buy an decoiler, understand your basic needs, and then consult Henli, we will give you the best buying advice.

Faults and solutions of uncoiler machine

1.Mechanical failure of the uncoiler.

1.1. The actual coil material used by the uncoiler is beyond its scope of application, as long as the coil material conforming to the purchased uncoiler is replaced.

1.2. The main shaft bearing of the uncoiler is damaged and the equipment cannot operate, which can be solved by replacing the main shaft bearing.

1.3. The transmission belt inside the fuselage of the uncoiler is too loose, resulting in slipping and unable to provide power normally. The fault can be repaired simply by tightening the drive belt.

2.The electric control box of the uncoiler is faulty.

2.1. The uncoiler fails to be powered on due to poor contact of the external power supply. Just check the power line and repair to solve the problem.

2. 2. The uncoiler cannot work normally due to damage to the time relay, intermediate relay and AC contactor. It only needs to be repaired or replaced with a new one to solve the fault.

2.3. The circuit of the induction device of the uncoiler is in poor contact or falls off. Targeted checks and then repairs can resolve the fault.

3.Motor and reducer failure of uncoiler.

If the motor makes no sound, the circuit of the motor is in bad contact or the motor has been burnt out. If the motor makes a sound but cannot work, it is necessary to check whether the shaft card is damaged. If the shaft card is damaged, the reducer is faulty. Generally speaking, the failure rate of the reducer is low, and it is generally necessary to eliminate other causes of failure before inspection.

How to maintain the uncoiler machine?

1. Before starting the uncoiler, check the grounding of the uncoiler to ensure that the grounding is good, so as to avoid damage to electrical appliances and personnel due to improper grounding.

2. Before the uncoiler is used, check the support tile of the expansion and contraction reel of the uncoiler to check the wear on its surface. At the same time, check the fastening condition of the relevant bolts and sliding shafts of the expansion and contraction reel and whether the bearing seat is damaged, and fasten or replace it.

3. Open the electric control box, check the fastening of the contacts in the electric control box, and ensure that the contact parts are not loose, so as not to cause electrical damage or sudden failure during use.

4. It is necessary to add butter to the main shaft bearing of the uncoiler every month (or when the working time reaches 260 hours). Every six months (or when the working time reaches 1500 hours), it is necessary to open the rear casing of the uncoiler and replace the oil for the reducer. Note: The amount of oil replacement is to fill to 1/2 between the axle and the rod.

Uncoiler/Decoiler FAQ

Here, I will introduce the common problems of the uncoiler one by one, including how to maintain the uncoiler, the analysis of the failure of the uncoiler, and other applications of the uncoiler.

If there is a topic about uncoilers/decoilers that you are interested in, please click the corresponding link.