Factors affecting bending during tube bending cnc pipe bending machine processing

BL-TP-45-6E Automotive copper aluminum tube bending machine

Ⅰ.Precautions for using tube bending cnc pipe bending machine

Keep the guide rails and wire of the tube bending cnc pipe bending machine clean and free from dirt. Before starting the machine, let the guide wheels and bearings rotate for several tens of seconds to remove any contaminants. Avoid striking or bumping any part of the equipment, especially the wire frame and bed surface, as this can cause accuracy problems.

Ⅱ.Material design of tube bending cnc pipe bending machine

Material design is crucial for tube bending cnc pipe bending machine, especially the selection of materials such as the rocker arm, clamping roller, and flattening roller. The rocker arm is made of 16Mn, taking into full account welding deformation, machinability, and bending torque. The clamping roller and flattening roller are made of ZG35 to prevent excessive ellipticity during bending; the frame rigidity should be adequately considered with a certain margin. Tube bending cnc pipe bending machine combine CNC technology with traditional pipe bending processes, emerging with the development of the machine tool industry. They offer high automation and efficiency, making them suitable for quickly and accurately bending complex spatial bending components.

Ⅲ.Features of tube bending cnc pipe bending machine

During processing, the entire screen tube remains stationary while the laser cutting head moves at high speed along the workpiece axis, resulting in high cutting efficiency. The cantilever of the tube bending cnc pipe bending machine is a frame structure welded from aluminum alloy plates, offering high strength and rigidity, avoiding problems such as excessive moment of inertia and spot drift during high-speed movement. The tube body is mounted on a support, supported at one end by a rotary centering device, and clamped at the other end by the CNC rotary head, ensuring the tube axis is parallel to the X-axis of the tube bending cnc pipe bending machine. The cutting head is moved in the Z-axis of the tube bending cnc pipe bending machine, positioning the focal point at the piercing position, and adjusting the distance between the cutting head nozzle and the screen tube surface to the preset value. Using the methods described above, laser cutting of pipes can solve various technical problems such as wide seams, and compared with traditional machining, it has advantages such as high processing efficiency, high processing accuracy, and a wide processing range.

Ⅳ.Factors Affecting the Bending of tube bending cnc pipe bending machine

Tube bending cnc pipe bending machines are shifting from traditional industries to high-tech materials and high-tech industries. This development has prompted traditional industries to “climb up” to new materials and “slide down” to high-tech fiber deep processing, adapting to emerging industries such as aviation, aerospace, medical, water conservancy, construction, decoration, and clothing.

So, what factors affect the springback after bending?

1.Mechanical Properties of the Pipe Material: As can be seen from the formula, the larger the strain modulus and the smaller the elastic modulus of the material, the larger the springback angle θ after bending. The smaller the hardening index, the larger the springback angle θ.

2.Relative Bending Radius ρ: Under the same parameters, the larger the relative bending radius, i.e., the smaller the degree of deformation, the larger the springback angle. This is because when the relative bending radius decreases, the total tangential deformation on the outer surface of the bent pipe increases, with both plastic and elastic deformation components increasing simultaneously. However, the proportion of elastic deformation in the total deformation decreases, thus resulting in less springback. Conversely, when the relative bending radius is large, the springback is smaller because the proportion of elastic deformation in the total deformation increases.

3.Bending Angle θ: The bending angle θ of the pipe also affects the springback. The larger the bending angle θ, the longer the deformation zone. Under the same bending conditions, the deformation per unit length is smaller, and the proportion of elastic deformation in the total deformation increases accordingly, resulting in a larger springback angle θ.

4.Complexity: Generally, the more complex the shape of the bent part, the greater the mutual constraint of deformation between different parts during bending, increasing the deformation resistance during bending. This reduces the compressive deformation component in the inner layer of the pipe, and the tangential stress distribution on the pipe cross-section tends to be more uniform, thus reducing the springback in a single bending process.

5.Bending Method: A large springback angle during bending reduces the springback angle when using corrective bending. The greater the corrective force, the smaller the springback value. In actual production, bending methods with a certain corrective component are often used. The corrective force is greater than the force required for bending deformation. In this case, the stress state and strain characteristics of the bending deformation zone are somewhat different from those of pure bending. When the correcting bending force is large, it may completely change the stress state of the deformation zone of the bent part, that is, the compressive stress zone gradually extends towards the outer surface of the pipe, causing compressive stress to appear in all or most of the pipe’s cross-section. Therefore, the direction of springback in the inner and outer zones becomes consistent, and its springback can be smaller than that of free bending.

6.The friction springback angle is also affected by friction. Friction between the surface of the pipe blank and the surface of the die can change the stress state of various parts of the blank. Friction can generally increase the tensile stress in the bending deformation zone, making the part shape closer to the shape of the die. However, the effect of friction is usually unfavorable during tensile bending. In addition, the surface of the pipe blank also has a significant impact on springback. If the pipe surface is uneven, has protrusions, or contains impurities, stress concentration will occur during bending, thus significantly affecting springback and even causing defects such as twisting and cracking.

When selecting bending actions for a tube bending cnc pipe bending machines, decomposition of actions can be used to observe interference points and modify actions to improve efficiency. The control system of the tube bending cnc pipe bending machines has certain requirements regarding specifications during operation. Tube bending cnc pipe bending machines are now changing the traditional form, offering high efficiency and precision, making them very popular in markets with demanding pipe bending requirements.

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