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Why is Pre-Pinching/Pre-Bending Necessary in Plate Bending/Rolling?

Updated: Dec 22, 2023

Manufacturing industries around the world are looking to provide near-perfect products and solutions to their clients. A large part of these companies have requirements for bending/rolling metal plates. The plate bending/rolling industry has been practicing pre-pinching or pre-bending for a longer period of time.

Pre-pinching/pre-bending helps the manufacturers achieve the complete roundness they desire to achieve for their metal plate. Today, we will discuss the importance of pre-pinching/pre-bending and how it is performed on metal plates.

First, let’s discuss what pre-pinching/pre-bending is and then move to the reasons that make it necessary and non-optional.

What is Pre-Pinching/Pre-Bending in Plate Bending?

Plate-bending/rolling technology is everywhere. From sewage pipes to large machines that need outer shells made of metal plates, the plate bending/rolling industry is a worldly-spread one.

Pre-pinching is bending the metal plate initially by placing it and holding it tightly between two rolls in a plate bending machine. Performing this on the metal plate is necessary to get the most possible flat end you can have as a manufacturer.

When you decide to bend or roll a metal plate, you must keep certain parameters in mind, such as the angle at which you want to bend or roll the plate, minimizing the waste, optimizing the machine's efficiency, and many others.

This process helps connect the metal plate's two ends since the plate's pre-bent end is the flattest possible. First, let's discuss the reasons why pre-pinching/pre-bending is not optional.

Why is Pre-Pinching/Pre-Bending Required in Plate-Bending?

There are four main reasons why the leading manufacturers around the world perform pre-pinching/pre-bending. First, the process is critical to the plate-bending/rolling process and the quality of delivery to the customers.

1) Bending the Surface Uniformly

When the engineers decide what shape and size they want the metal structures to be, the pre-pinching/pre-bending plays a crucial role. When a plate is pre-pinched, it forms a properly rolled metal plate that undoubtedly ends up with a smooth and uniformly bent/rolled metal plate.

2) Eliminate Wastage

No doubt, an experienced operator will help you bring out as much efficiency from the machine as possible. Yet, it cannot be overlooked how pre-pinching/pre-bending provides an optimal structural formation for the plate to be able to connect both ends with near-perfect angles.

3) No Need for Extra Trimming

When the ends don’t meet after rolling, you need to trim down some parts of the bent/rolled plate. Pre-pinching/Pre-bending allows you to connect both ends of the rolled plate almost perfectly. Hence, you can save your resources for other fabrication work and be worry-free about the efficiency and effectiveness of the rolled metal plate.

4) Saves Time

Fabrication shops cannot afford to waste even a second, leave out the longer times. With pre-pinching/pre-bending, you can form the required shape on the metal plate as fast as possible and save some time for yourselves and the workshop.

rolling dynamics of plate bending machine

How is Pre–Pinching/Pre-Bending Performed?

As stated earlier, the process of pre-pinching/pre-bending is made possible by the same plate bending/rolling machine you will use for bending/rolling the metal plate. This can be done on any plate bending/rolling machine, such as a 3-roll plate bending machine or a 4-roll plate bending machine.

First, you need to take the metal plate and place it on the conveyor or the support table to ensure that any undesired bending or breaking doesn’t happen due to the weight or length of the plate.

Next, get the plate between the top roll and the bottle roll. Now, press the plate between the rolls and perform a 360-degree bending.

Finally, you have the pre-pinched/pre-rolled end of the plate and can go ahead with the bending/rolling of the plate.

Here’s a flow to understand how the pre-pinching or pre-bending process is made possible.

→ Take the plate and place it on the support table or the conveyor.

→ Place the end of the plate firmly between the top roll and the bottom rolls of the plate bending/rolling machine you are using.

→ Now, with the help of your experienced operator, start the machine and perform a 360-degree bending on the metal plate you need to get bent eventually.

This is how the pre-bending/pre-pinching of the metal plate is achieved in order to finally get the plate in the desired and required shape.

Need Plate-Bending Solutions? Himalaya is Here for You

We, Himalaya Machinery, have an experience of over 4 decades in the metal forming industry. We hope we can scrap every doubt you had about the pre-pinching/pre-bending process. If you still have any doubts about the same or require plate bending/rolling solutions, feel free to contact us.


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