Quenching shape control method for flexible die of aluminum alloy curved surface part for spaceflight

Abstract

The invention provides a quenching shape control method for a flexible mold of an aluminum alloy curved surface part for spaceflight. The quenching shape control method comprises the following steps: S1, obtaining a part plate blank according to a product structure; s2, a part is obtained through pre-drawing; s3, setting heat treatment parameter values; s4, carrying out solid solution heating and heat preservation on the preformed test piece; s5, after solid solution heating and heat preservation are completed, the sample is rapidly transferred to a quenching mold, the pre-formed sample is positioned, rapid mold closing is conducted, and forming is completed; s6, closing the mold, maintaining the pressure, and cooling (quenching) to obtain a test piece; and S7, taking out the test piece, and performing natural aging or artificial aging. According to the quenching shape control method for the flexible die of the aluminum alloy curved-surface part for spaceflight, the total time from rapidly taking out a plate blank from a furnace to before forming does not exceed 15 seconds by designing the flexible quenching die of the aluminum alloy curved-surface part in the forming process; and the problem of thermal deformation-quenching composite forming cracking of the spaceflight aluminum alloy curved surface piece with the large depth (27 mm) and the large curvature is solved, and therefore the product percent of pass is 100%.

Description

technical field [0001] The invention belongs to the technical field of aerospace equipment, and in particular relates to a method for quenching and controlling the shape of a flexible mold of an aluminum alloy curved surface part for aerospace. Background technique [0002] There are many types of sheet metal parts for launch vehicle body structures and complex structural dimensions. In the prior art, most of them are typical structural curved surface parts with large depth (27mm) and large curvature. The material of this type of product is 2A12, limited by the material and structure, there are the following problems during forming: it is easy to crack when it is directly formed in T4 state or T6 state; after forming in O state, the heat treatment distortion is serious and the pass rate is low; Deformation-quenching composite forming technology is suitable for structural curved parts with small depth and large curvature. For such structural parts with large depth and large c...

AI Technical Summary

Problems solved by technology

The material of this type of product is 2A12, limited by the material and structure, there are the following problems during forming: it is easy to crack when it is directly formed in T4 state or T6 state; after forming in O state, the heat treatment distortion is serious and the pass rate is low; Deformation-quenching composite forming technology is suitable for structural curved parts with small depth and large curvature. For such structural parts with large depth and large curvature, although the accuracy of shape and size can be ensured, the softening of the slab after solution heating is serious, and the drawing process is not easy. Flow feeding, concentrated deformation and cracking, not suitable for deep component forming

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