Die forging processing method for titanium alloy frame forgings with variable cross-section

Abstract

The invention discloses a die forging processing method of a titanium alloy frame-like forging with variable cross-section. The titanium alloy frame-like forging with variable cross-section has a nearly circular frame structure. The cavity of the lower die of the forging die is provided with a concave structure distribution cavity corresponding to the difficult-to-form part of the designed forging during the forging process, and the distribution cavity on the billet mold and / or pre-forging die is used as a corresponding manufacturing The distribution of blanks and / or pre-forgings when they are formed by equal cross-section, equal radius to variable cross-section, and variable radius frame expansion during die forging. The invention can effectively adjust the flow speed and direction of the metal material during the forming process of the blank and / or pre-forging, so that the difficult-to-form parts and easy-to-form parts on the designed forging tend to be formed at the same time and with high quality, thereby reducing the forming pressure , To avoid the confluence of metal materials in forging in difficult-to-form parts and cause defects such as folding, and to ensure high-efficiency and high-quality forming of difficult-to-form parts of designed forgings.

Description

technical field [0001] The invention belongs to die forging technology, in particular to a die forging processing method for a large nearly circular irregular variable cross-section titanium alloy frame (ie frame structure) forging. Background technique [0002] Large-scale near-circular irregular variable-section titanium alloy frame forgings are important load-bearing components on aircraft (aircraft), such as bulkheads and wall panels as large-scale ribs, and their forging process and forming quality have always been the focus of the industry. technology focus. [0003] The forging forming of such forgings is generally realized by die forging according to the technological process of "blank making + pre-forging + final forging". In the existing die forging processing technology, the forging process of the corresponding blank and / or pre-forging in the blank making process section and / or the pre-forging process section is only realized by expanding the frame of the traditi...

AI Technical Summary

Problems solved by technology

[0004] However, the forming process of this kind of forging is to pass the forging process of the upset cake with equal cross-section and equal radius through the forging process in each process section to form a variable cross-section, variable radius expansion, and irregular near-circular frame structure. Radius upsetting to variable section, variable radius frame expansion - that is, blanks (upsetting cakes with equal section and radius are converted into blanks with variable section and radius after forging), pre-forgings (equal section, equal radius Upsetting cakes are converted into blanks with variable cross-section and radius by forging, and then converted from blanks with variable cross-section and radius to pre-forgings with larger frame-expanding structure changes) and other forming processes. With the change of the cross-sectional structure along the circumference and the change of the radius distance between the nearly circular frame and the equal-radius upset cake, there must be relatively easy-to-form parts and difficult-to-form parts in the die forging process.

The blanks and / or pre-forgings processed by the existing die forging processing technology are unevenly distributed, resulting in insufficient forming of thick and large parts and parts far from the center (that is, difficult-to-form parts on the forging parts), which is difficult for the subsequent process section. The processing brings a series of technical problems, including inaccurate positioning of the post-processing section, folding, poor process control consistency and many other technical problems. The processing technology is more difficult, the efficiency is reduced, and the quality is not easy to guarantee.

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