In aviation, aerospace, automobiles, and high-speed rail usually use the aluminum profile stretch and bending forming process.In the civil (aviation, high-speed rail, etc.) field, many skeleton parts use profile frames. Therefore, the research on stretch bending technology is of great significance to improving the quality of stretch bending parts and accelerating the localization process of stretch bending parts.
The aluminum profile bending process can enable parts to obtain reasonable calibration margins, improve the manufacturing accuracy of parts, and reduce the manufacturing cost of parts. Stretch bending refers to the forming process. Press the profile into the mold groove under the combined action of bending moment and longitudinal tension. Aluminum profile stretch bending is an important forming process in industrial production. In addition, we also use this process in the production of variable curvature extrusion and plate bending profiles.And those bending parts with large size, high shape accuracy requirements and large relative bending radius.
Introduction to processing process:
⑴ Incoming material inspection. Check the profile cross-section size, profile straightness, blank length, and surface quality as required, paying special attention to whether there are surface defects.
⑵Milling processing. For the reverse T-shaped frame, we need to mill the profile before bending.In order to ensure that the size after bending meets the requirements, we perform milling on a gantry milling machine and process the size to the nominal value + 2mm.
⑶ Pre-tension bending. On the stretch bending machine, the stretch bending die and the stretch bending chuck are used to pre-stretch and bend the blank by controlling the stretch bending parameters (bending force, bending angle, etc.) to meet the preforming requirements.
⑷Trimming. Check the flatness and angle of the two surfaces to ensure that these values meet the requirements. For the R value, you can use a three-roller bending machine to assist in trimming to the predetermined shape.
⑸Inspection after pre-tensioning and bending. Check that the flatness, angle, cross-section width, etc. If the two surfaces meet the requirements, and the R1000mm value reaches our predetermined shape.
⑹ Transportation and storage after quenching.Ensure the new quenching state of the aluminum alloy material.Store the part at a temperature below -10°C after quenching and before forming. After heat treatment, the first step is to store them in a cold storage. During transportation, transport them in a refrigerated truck and refrigerated. The temperature of the car should be lower than -10℃.
⑺ Make up for the bend. On the stretch bending machine, the stretch bending die and the stretch bending chuck are used to control the stretch bending parameters (bending force, bending angle, etc.) to re-bend the semi-finished product to meet the final requirements.Depending on the specific conditions of different parts, we can selectively pull and trim them to achieve the ideal shape and size.
⑻Trimming. On the calibration platform, use auxiliary tools such as hammers for trimming. If necessary, use the calibration inspection mold for knocking.
⑼Inspection. Use inspection molds with calipers and feeler gauges to conduct inspections. To ensure compliance with customer technical requirements and drawing requirements.
⑽Fitter. Use scouring pads and other grinding tools to modify and clean the surface and mark parts and test pieces to ensure traceability.