Precision forging near-net forming technology for light alloy non-revolving body special-shaped integral pull rod

Abstract

The invention provides a precision forging near-net forming technology for a light alloy non-revolving body special-shaped integral pull rod. The precision forging near-net forming technology is characterized in that the size of a to-be-forged thick-wall pipe is designed according to the drawing requirement; a radial precision forging machine is adopted, and a forging hammer is used for forging and drawing out a pull rod part; after forging and drawing out are completed, the forging hammer is replaced, and then the radial precision forging machine is adopted for forging and reducing forming ofan end of the pull rod; after forging and reducing are completed, the forging hammer is replaced, and then the radial precision forging machine is adopted for forging and flattening forming of the end of the pull rod; and after forging is completed, machining forming of the end of the pull rod is carried out. For a titanium alloy pull rod needing hot forging, the radial precision forging machineis adopted to be combined with a three-hot-method technology of heating in a furnace before forging, feeding induction heat supplementing and induction heat preservation during forging to implement precision radial near-net forming forging of the titanium alloy integral pull rod. According to the precision forging near-net forming technology, the comprehensive performance is improved while the shape of the integral rod is obtained, and the purpose of less machining after forming is achieved.

Description

technical field [0001] The invention relates to a forming process of a light alloy non-revolving special-shaped integral tie rod. Background technique [0002] Aircraft structure tie rods are widely used in key parts such as engine nacelles, control systems, fairings, rudder surfaces, hatches, and landing gears of fixed-wing aircraft, as well as rotor systems and tail rotor systems of rotorcraft. The urgent requirement for performance improvement is to reduce the overall weight of the aircraft to maximize the flight thrust-to-weight ratio. Therefore, the use of aluminum alloys and titanium alloys with high specific strength is the first choice for key aviation components to achieve high performance and lightweight. In order to further reduce the weight factor and improve performance and reliability, it is often required to adopt lightweight and efficient design concepts such as integral, thin-walled, and high-precision products in product structure. A typical titanium alloy...

AI Technical Summary

Problems solved by technology

[0015] Due to the high melting point of titanium alloy welding and poor thermal conductivity, the "separate processing + welding fit" method is prone to produce coarse grains in the weld and near the seam, resulting in a decrease in the plasticity and toughness of the weld

At the same time, it is difficult for titanium alloys to prevent the absorption of harmful gases such as hydrogen, oxygen, and nitrogen at high temperatures during the welding process, which will cause excessive harmful gas elements in the weld. On the one hand, it is easy to form defects such as pores, and on the other hand, it will cause abnormal stress increases High, the plasticity is seriously reduced and the weld becomes brittle, resulting in insufficient quality and reliability of the tie rod

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