Accurate forming method for large-curvature and high-order-difference edge sealing frame

Abstract

The invention provides an accurate forming method for a large-curvature and high-order-difference edge sealing frame. The accurate forming method is characterized by comprising the following steps that a rectangular blank is blanked, the margin of 15 mm is added to each of the two edges, in the width direction, of the blank on the basis that the part is expanded in the width direction, the length between a die to a transition section of a stretch bending equipment jaw and the length between the die and a clamping section of the stretch bending equipment jaw are added to the blank length during stretch bending forming on the basis of the length of the stretch bending forming die; trichloro ethylene vapor degreasing is conducted on the blank, the surface of a part is cleaned, burrs on the edge of the blank are removed, and an end face is sanded through abrasive paper; and a bending forming machine is used for conducting pre-forming on the blank, the order difference, the bending radius and the angle of the blank are completely the same with those of the part, the blank is pre-bent to form a ruled-surface transition part with a 45-degree Z-shaped section, the two ends of the blank are flattened to have the clamping width of the stretch bending forming machine jaw, and therefore clamping is facilitated.

Description

technical field [0001] The invention belongs to the technical field of machining. Background technique [0002] EC175-straight 15 international cooperation model, applied to the sealing frame parts of tail beam honeycomb bonding, and glued with the inner and outer skins with theoretical shape, it plays the role of fixing and sealing the honeycomb. The parts are affected by the shape of the tail beam, and the shape Large curvature, high step difference, complex shape, shape accuracy, and surface quality requirements are higher than conventional sheet metal parts. The parts are required to have a tire adhesion of 0.3mm, no scratches and processing marks on the surface, and the manufacturing difficulty of parts is greater than that of conventional sheet metal parts. . [0003] At present, domestic research and technology accumulation on the forming process of such parts are still based on rubber bag forming and drop pressure forming, which has poor guidance for the precise for...

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Problems solved by technology

[0003] At present, the research and accumulation of forming technology for such parts in China are still based on rubber bag forming and drop forming, which has poor guidance for the precise forming of parts with large curvature and high step difference sealing frame, which is not conducive to ensuring the forming quality

[0004] Using the rubber bag forming method, large springback will occur due to the high forming step difference, and the manufacturing compliance cannot meet the design requirements of the part. At the same time, a large number of manual corrections are required, which affects the surface quality of the part.

[0005] The drop hammer forming method requires 2 to 3 times of mold drop pressure forming. The number of molds is large, and the wrinkles in the forming process are manually eliminated, annealed and softened, and then the above operations are repeated or the final forming and correction are performed directly on the mold. Due to repeated There will be a lot of hammer marks on the surface of the parts due to pressure drop and manual operation. In order to eliminate the tooling and tool marks on the surface, a lot of manual grinding and repair work is required. This forming method has low manufacturing conformity, and the tire adhesion is generally 0.5mm, which is qualified Low efficiency, large amount of manual calibration and grinding operations, low production efficiency

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