A Partition Die Compression Forming Method for Lightweight Alloy Thin-wall Curved Surface Parts

Abstract

The invention discloses a partition molding method for light alloy thin-wall curved surface parts, which comprises the following steps: 1) designing a partition mold according to the deformation law of thin-wall curved surface parts, and formulating the number and arrangement of concave die partitions; 2) forming a light alloy plate After heat treatment or cryogenic treatment, it is transferred and positioned to the partition die; 3) The punch moves downward and gradually contacts the partition die, so that the plate is gradually attached to the mold from the middle area to both sides, until a thin-walled curved surface part of the desired shape is formed ; 4) The punch is reset, and the curved surface part is taken out, and the light alloy thin-walled curved surface part is formed by partition molding. The overall large deformation is decomposed into small deformations of each partition through partition sequential forming, which significantly reduces the shape asymmetry of the real-time forming zone and reduces the compressive stress level at the larger end of the radius of gyration; through partition sequential forming, the deformation of each zone of the slab is changed Sequentially, the easily cracked area is formed first, and the wrinkled area is formed later, so as to improve the deformation uniformity of thin-walled curved surface parts.

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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