The bending process of aluminum profiles has been widely used in the manufacturing of bending parts for aviation, aerospace, automobile, and high-speed rail. In the civil field (aviation, high-speed rail, etc.), many skeleton parts are made of profile frames. Therefore, the research on bending technology is of great significance to improve the quality of bending parts and accelerate the localization process of bending parts.
The aluminum profile bending process can make the parts obtain a reasonable shape allowance, improve the manufacturing accuracy of parts, and reduce the manufacturing cost of parts. Tensile bending refers to the forming process in which the profile is pressed into the mold groove under the combined action of bending moment and longitudinal tension. Aluminum profile bending is an important forming process in industrial production, which is used to make variable curvature extrusion and plate bending profile bending parts with large size, high requirement of contour accuracy, and large relative bending radius.
The inner surface of the workpiece is a neutral layer, and all the other positions are extended, that is to say, theoretically, all the parts will be longer than the original after bending. So what are the points that should be paid attention to when processing aluminum bending?
1. The aluminum alloy profile must be stretched on the stretching frame after it is cooled to below 50 degrees. If the temperature is too high, stretching can burn not only the body but also the top. Furthermore, because the internal stress of aluminum alloy profiles can not be eliminated, there will be bending, distortion, poor function, and other waste products before and after aging.
2. The tensile amount is controlled at about 1%. It should be noted that excessive tensile amount will produce standard errors of head and tail, and there will be water wrinkles (fish scales) on the surface, low elongation, and high brittleness (low plasticity). Too low a tensile amount will make the profile’s compressive strength and hardness low, even aging (quenching) can not improve the hardness, and the profile is easy to bend into an arc (commonly known as broadsword bending).
3. To control the tensile deformation and better control the standard change of the whole profile, a suitable special fixture, and suitable method should be selected. Especially the opening material, arc material, cantilever material, and curve profile, should pay more attention to the reasonable use of drawing fixtures.
4. Pay attention to the force of small feet, fine teeth, long legs, camber, inclined plane, opening, Angle, and so on. Profiles with a high width-to-thickness ratio, long overhanging walls, large radians, large differences in wall thickness, and strange shapes can avoid standard deformation, distortion, spiral, and other defects.
5. As the top has a heat resistance announcement function, the decorative surface of the high requirements of the aluminum profile must be turned up and down, back and forward, to facilitate uniform heat dissipation, reduce the uneven heat dissipation and different crystallinity caused by the transverse highlight defects, especially large width, thick wall aluminum profile.
6. In the process of taking material and moving and stretching, they shall not touch, pull, stack, jam, and intertwine with each other, and a certain interval shall be reserved between each other. The aluminum alloy profile should be timely disposal if it is too easy to twist or the length discharge, maintain and dispose of each other when necessary.
