A Cold-Heat Sequential Coupling Forming Process for Large Aluminum Alloy Complicated Structures

Abstract

A cold-hot sequential coupling forming technology of large-scale aluminium alloy complex structural members is a novel forming technology which is derived from the intersection and fusion of liquid-filled forming technology and hot-stamping forming technology. The novel forming technology has the characteristics of liquid filling forming and hot stamping forming at the same time. The cold-hot sequential coupling forming technology comprises the steps that the upper and lower dies are closed, according to adjusting the blank holder force, a panel veneer is impacted between the dies; the panel veneer is attached to die profiles in function of high pressure liquid in a liquid chamber, the forming of most features is completed; and after forming the liquid-filled, according to the characteristic of the thermoplasticity of materials, the hot-stamping technology process is carried out by using heated movable insert blocks, the forming of local features is completed, sequential forming of different part features is completed, and final product parts are obtained. The dies are installed in one time, and two forming processes are realized, and thus the time-consuming of switching the dies is reduced, and the accuracy requirements of global forming and external dimensions of the product parts are guaranteed. At the same time, the movable insert blocks are convenient to install and easy to replace, so the time of repairing dies is reduced and the production efficiency is improved. The sequential forming technology has the unique advantages of in the forming of aerospace, automotive and other fields of complex structural alloy members, and has wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of plastic forming of metal plates, and in particular relates to a cold-heat sequential coupling forming process of large aluminum alloy complex structural parts. Background technique [0002] With the continuous emergence of high-tech technologies in the fields of aerospace and automobiles and more complex working environments, the requirements for the performance, material properties and appearance of structural parts are getting higher and higher, including structural lightweight, high-quality and overall requirements, etc. Therefore, light alloys with excellent comprehensive properties have been widely used, and at the same time, certain requirements are put forward for the dimensional characteristics, surface quality and precision level of alloy structural parts. [0003] For large alloy parts with light weight and complex structure, due to their high strength and poor plasticity at room temperature, i...

AI Technical Summary

Problems solved by technology

[0004] However, for local complex small features on parts (such as small rounded corners and small dimples, etc.), it is difficult to form them under a certain liquid chamber pressure

In order to fully form local small features, only by increasing the pressure of the liquid chamber, it is bound to increase the accumulation of equipment tonnage

At the same time, under the condition of low liquid chamber pressure, most of the features of the part have been fully formed, and increasing the tonnage of the equipment has not significantly improved the overall forming quality of the part.

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