The process of tubing bending start with loaded tubes into a tubing bender tightening or clamping it between the two dies; the forming die, the fastening block. The tube is loosely attached by two other dies, the pressure and the wipers die.
Tubing bending engines are generally pneumatic powered, human powered, hydraulic driven and electric actuators. These are some of the processes of a successful tubing bending.
This is usually the principal bending procedure used mostly on cold tubing and pipes. During this process, the bending tool is push e dalong side the pipe and the pipe is pushed or forces to take the form of the curve. Since the tubing is not braced from the inside, the figure of the tubing is deformed to form an elliptical section or an egg-shaped cross section. Use this procedure when a consistent driving section is not always required. A single or one die can have a variety of shapes and can only work for single size tubing and radius.
Rotating draw bending
Rotational draw twistingis an accurate technique because it uses a constant axis line radius tool (CLR) or a “die set” indicated as a mean bend radius for bending. Rotatory draw bending equipment can always be programmed to keep multiple bending tasks with different amounts of bending. Tubing benders are often equipped or attached with an arranging key table that allows operators to reproduce many complex bends with different surfaces and planes.
During this roll bending procedure, the tube, the extrusion or the solid undergoes a sequence of rollers (generally three) which exert a pressure on the tube, progressively modifying or varying the bending radii in the tube. The pyramidal roller bender includes a movable roller, commonly the topmost roll. The Double Pinch Roller Bender has two adjustable rollers usually the lower roll and a fixed uppermost roll. This bending process causes very small deformations of a part of the tube. This method is not only suitable for long-term soft bending, as it is used in string systems and rolled tube production.
Three-roll push bending
This three-roll push bending (TRPB) is normally the most commonly used form for bending in free-form bending processes with several curve of bending planes. However, 3D molding is possible. When the supporting roll and the bending roll are pressed by the tool, the profile is guided between the bending roll and the backing roll. The position of the forming roll normally defines the bending radius. The point of inflection is the point of contact between the bending roll and the tube. To modify the plane of curvature, the pusher alternates the tube about the longitudinal axis. In general, the TRPB set can be useful to traditional rotary draw benders. The geometric accuracy of the process is not as good as that of the benders, but the procedure is very bendable and you can get it with your own set of tools, some values of radius of the benders. You can create bending contours defined as spline or polynomial functions.
Simple bending with three rolls
The 3 roll twisting of the tube profile can usually be made with simpler equipment (semi-automatic and non-CNC control) and the tube can be traversed by contact. These engines usually have aupright layout. That is, the 3 rolls are in aupright plane.
Thermal or heat induction
The stimulation coil is positioned around the point of the tubing at the curve part of the tube. It is heated between 800 to 2200 degrees Fahrenheit (480 to 1200 degrees). When the tube is hot, then pressure is applied to bend the tube. Then, the tube is quenched with water spray or air. Thermally induced meandering or is used for large pipelines such aspower plants, freeway signs, oil pipelines and many more.,there is a lot of tubing benders,you can buy it from kp-lok.com.