A conformal micro-constrained rigid support device and heat treatment method for deformation control of thin-walled aluminum alloy castings

Abstract

The invention discloses a conformal micro-restrained rigid support device for deformation control of a thin-walled aluminum alloy casting, wherein the device is characterized by comprising a bottom tray and a conformal skeleton arranged on the bottom tray; the shape of the conformal skeleton is conformal to an inner cavity of the casting, threaded holes are formed in the conformal skeleton and areprovided with bolts from interior to exterior, and the bolts correspond to intersection points of longitudinal ribs and annular ribs in the inner cavity of the casting; a plurality of opening holes are also arranged on the conformal skeleton. The conformal micro-restrained rigid support device is particularly suitable for large thin-walled complex aluminum alloy components, and has low structuralstrength coefficient and large deformation tendency. According to the device and method, the deformation of the components in heat treatment can be effectively reduced.

Description

Technical field: [0001] The invention relates to a conformal micro-constraint rigid support device for deformation control of thin-walled aluminum alloy castings and an application method thereof, belonging to the technical field of aluminum alloy deformation control. Background technique: [0002] With the advancement of lightweight, large size, thin wall, precision, complexity, high quality, and nearly no margin are common requirements for the development of aluminum alloy components, and are increasingly widely used in aerospace, weapons, ships and other fields. Thin-walled aluminum alloy components have a large outline size (800~1700mm), the shape is a special-shaped curved surface, and the wall thickness difference is large (locally up to 40mm). During solidification, the concentration difference of the structure shows different yield behaviors, which causes the lattice distortion to generate the structure stress. Thermal stress concentration. The clamping stress in t...

AI Technical Summary

Problems solved by technology

The clamping stress in the machining process is easy to cause large processing deformation for thin-walled castings with poor rigidity

[0003] At present, relevant research has been carried out in China on the technical problems of severe deformation of large and complex thin-walled aluminum alloy components, which are divided into three stages of casting, heat treatment and machining. Vibration aging, machining fixture design and other aspects have achieved certain effects, but the effect on the deformation control of components is limited

[0004] Especially during the heat treatment stage can cause great deformation

The heat treatment stage is divided into three stages: solid solution, quenching and aging. In the solid solution stage, the casting needs to be hoisted to a high-temperature furnace to be heated to 500°C and kept for 12-14 hours. During this process, for large thin-walled parts and In other words, it is easy to collapse downwards in the height direction, resulting in the casting being easily deformed in the height direction

When quenching, it is necessary to hang the solid solution casting into cold water in a very short time, preferably within 10s, so that the temperature of the casting drops to 60~80°C. Changes will lead to overall deformation of the casting, whether it is in the height direction or in the circumferential direction, etc. In addition, it will also cause cracks in the casting and affect its strength

In severe cases, its deformation will exceed 20%, resulting in the casting being completely scrapped and unusable, which is a great waste of materials, labor or time

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