Revealing The Secret of Precision Pipe Bending - What Is The Decision Based On?

Revealing the secret of precision pipe bending - what is the decision based on?

In the field of pipe bending, the use of pipe bending machines is indispensable to achieve high-precision and high-quality pipe bending products. The key to the excellent work of these pipe bending machines lies in the high-quality tools they are equipped with pipe bending dies. These pipe bending dies play a vital role as the key to precision in pipe bending. Pipe bending dies include bending dies, clamping dies, pressing dies, mandrels and anti-wrinkle (wiper) dies. All of these dies have their unique functions.

Bending Die:

Bending dies are also called radius dies or tube bender tools. They are used to form curves by applying a certain amount of pressure to the Bending dies（pipe bending mould）with different specifications are customized according to the diameter and wall thickness of different tubes. The size of the bending die is determined by the size of the tube bending radius.

Clamping Die:

This die is mainly used to fix and clamp the tube in conjunction with the bending die to ensure the stability of the die and the accuracy of the tube bending during the pipe bending process. During the tube bending process, the clamping force and moving speed of the clamping die will have a certain impact on the bending of the tube. Insufficient clamping force may cause the tube to slip or deform during the bending process, while excessive force may cause the tube to be subjected to excessive pressure, resulting in rupture or deformation. If the clamping die moves too fast, the impact force on the tube during the bending process may increase, thereby increasing the risk of deformation and rupture of the tube. If the clamping die moves too slow: Although a slower speed can reduce the impact force, too slow a speed may cause wrinkles or folds in the tube during the bending process. Therefore, we usually use the flow valve in the hydraulic pipe bending system to control the flow of hydraulic oil, thereby controlling the clamping force and moving speed of the clamping die to achieve the most ideal bending effect.

Pressure die：

The pressure die is an auxiliary device for bending pipe. It clamps the pipe and assists in pushing them when bending the pipe, so that the pipe remains stable when bending. When the pipe is stretched and compressed by the pipe bending die, the wall thickness of the pipe will change. The auxiliary push device can apply a certain auxiliary push pressure on the outside of the pipe to reduce the range of variation of the pipe wall thickness, thereby achieving a smooth and full effect on the surface of the pipe after bending. The power and speed of the auxiliary push die are also very important in pipe bending. Pressure die working speed must be consistent with the operating speed of the clamping die. In actual operation, it needs to be adjusted and optimized according to specific factors such as pipe material, size and bending requirements.

Anti-wrinkle die (Wiper Die)：

Anti-wrinkle die is an auxiliary tool that can support the inner wall of the pipe during the pipe bending process, so that the pipe wall is evenly compressed and thickened when the pipe is bent to prevent wrinkling. The material of the anti-wrinkle die is different depending on the material of the pipe. If it is a stainless steel pipe, we can consider using high-quality alloy steel, which is wear-resistant, corrosion-resistant and high-temperature resistant.

Mandrel：

At the bend of the pipe, the pipes are prone to deformation, breakage and incomplete bending due to the thinning of the wall thickness due to bending and stretching. The mandrel provides support and stability to the pipe during the bending process, making the surface full after bending. The mandrel of the pipe bending machine is generally controlled by a hydraulic system to complete a series of actions such as mandrel forward and mandrel backward and assist the pipe bending machine to present an ideal bending effect.

Wiper die and Mandrel:

Wiper die and mandrel are not required for all pipe bending. It is determined by the wall thickness of the pipe, the size of the bending radius, and the size of the outer diameter of the pipe. The following figure shows the size of the possibility of use. The thinner the wall thickness of the pipe, the larger the outer diameter, and the smaller the bending radius, the greater the possibility of using wiper dies and mandrels, and vice versa.