Partition die-pressing forming method for light alloy thin-wall curved surface part

Abstract

The invention discloses a partition die-pressing forming method for a light alloy thin-wall curved surface part. The method comprises the following steps that (1) a partition die is designed accordingto the deformation rule of the thin-wall curved surface part, and the number and the arrangement mode of female die partitions are formulated; (2) a light alloy plate is transferred and positioned topartition female dies after being subjected to heating treatment or cryogenic treatment; (3) a male die moves downwards and is contact with the partition female dies step by step, so that the plate is gradually attached to the die from the middle area to the two sides till the thin-wall curved surface part in the needed shape is formed; and (4) the male die is reset, the curved surface part is taken out, and partition die-pressing forming of the light alloy thin-wall curved surface part is completed. Through partition sequential forming, overall large deformation is decomposed into small deformation of the various partitions, the shape asymmetry degree of a real-time forming area is remarkably reduced, and the pressure stress level of the end with the large turning radius is reduced; andthrough partition sequential forming, the deformation sequence of all areas of a plate blank is changed, the area prone to cracking is formed firstly, the area prone to wrinkling is formed later, andthe deformation uniformity of the thin-wall curved surface part is improved.

Description

technical field [0001] The invention relates to the technical field of sheet metal forming, in particular to a partition molding method for light alloy thin-wall curved surface parts. Background technique [0002] As the new generation of carrier equipment has higher and higher requirements for lightweight and high reliability, light alloys such as aluminum alloys and titanium alloys are widely used in the fields of aviation, aerospace and automobiles due to their high specific strength, stiffness and structural properties. in the main structure. Taking launch vehicles as an example, the aluminum alloy main structure accounts for more than 80%. Aerospace components are usually thin-walled and large in size, and the manufacturing route often adopts the method of split forming + assembly welding. For example: the bottom of the carrier rocket fuel storage tank has an opening size greater than 2 meters, even up to 10 meters. Tailored and welded. In order to meet the subseque...

AI Technical Summary

Problems solved by technology

For curved surface parts with large curvature changes and thin wall thickness, such as melon petals of carrying storage tanks, due to the asymmetrical shape of the profile and the large difference in the radius of curvature within the surface, large compressive stress will be generated in the area with a large radius of gyration during molding , causing wrinkling

In addition, the springback of lightweight alloys at room temperature is large, and the dimensional accuracy of thin-walled curved parts is also poor.

Although stretching can solve the problems of large springback and easy wrinkling in the molding of melon petals and thin-walled curved parts such as skins, the stretching is to clamp the two ends of the slab and then stick to the mold. On the one hand, it requires a long transition section to meet the end clamping and surface forming, the material utilization rate is less than 30%, and the material waste is serious; on the other hand, there is a sequence of contact between the slab and the mold, there is serious deformation unevenness, and even cracking leads to the formation can not be completed smoothly

[0004] The existing technology cannot solve the problem of wrinkling in the molding of such thin-walled curved parts

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