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Stepped forging forming method for super-huge type titanium alloy propeller hub forged piece

A titanium alloy and super-large technology, which is applied in the field of step-by-step forging of super-large titanium alloy propeller hub forgings, can solve the problems of large-scale mold casting technology not being able to keep up, mold life not being guaranteed, and large investment in research and development of forgings. Achieve the effects of improving metal flow direction, shortening processing cycle and reducing production cost

Inactive Publication Date: 2017-12-01
GUIZHOU ANDA AVIATION FORGING
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Problems solved by technology

At present, there is still a lack of heavy equipment and mature high-temperature mold casting technology. Using isothermal forging to produce propeller hub central parts can reduce the tonnage of equipment, but large-scale mold casting technology cannot keep up. There are usually a large number of shrinkage cavities and shrinkage in molds. The service life cannot be guaranteed, and the R&D cost of forgings is too large

Method used

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  • Stepped forging forming method for super-huge type titanium alloy propeller hub forged piece
  • Stepped forging forming method for super-huge type titanium alloy propeller hub forged piece
  • Stepped forging forming method for super-huge type titanium alloy propeller hub forged piece

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Experimental program
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specific Embodiment approach

[0024] The main chemical element content (percentage by weight) of the TB6 titanium alloy is: 2.6% to 3.4% of Al, 9.0% to 11.0% of V, 1.6% to 2.2% of Fe, and 0.9% to 1.5% of Ni , C content 0.05%, N content 0.05%, H content 0.015%, Y content 0.005%, other elements single ≤ 0.10% and total ≤ 0.30%, the balance is Ti.

[0025] The steps of this method are as follows:

[0026] Cut the titanium alloy into rods according to certain specifications, heat the titanium alloy rods to 1180±20°C, keep them warm at an effective thickness×(0.3~0.7)min / mm, and then upset them on a press to form a cake 10 ,Such as figure 1 As shown, the final forging temperature is ≥850°C; the upsetting process is allowed to be completed in multiple fires, and at the end of each fire, it needs to be returned to the furnace while it is hot and the holding time is halved; if there is any damage during the upsetting process, the damage must be removed before continuing ;During the upsetting process, the pressin...

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Abstract

The invention discloses a step-by-step forging forming method for an extra-large titanium alloy propeller hub forging. The billet is forged, and the rotary table is rotated at an angle after each press down, and the second press is performed until the surface is completely formed, the forging is turned over, and the other side of the forging is formed in the same way, and then trimmed Obtain extra-large titanium alloy propeller hub forgings. This method can overcome the lack of equipment capacity, and obtain the forming of an extra-large titanium alloy propeller hub with good shape, size and structure. This method is used for the forming of extra-large titanium alloy propeller hub forgings.

Description

technical field [0001] The invention relates to a forging forming method, in particular to a step-by-step forging forming method of an extra-large titanium alloy propeller hub forging. Background technique [0002] The propeller hub is the core component of the helicopter rotor system. The lift generated by the rotor system is transmitted through the hub central part, and the anti-fatigue performance is strictly required. At present, the specifications of domestic propeller hub forgings are relatively small, and they are produced by near-isothermal forging. The new generation of large and heavy helicopters weighs 3 to 4 times that of ordinary helicopters, and their hubs are much larger than ordinary helicopters. At present, there is still a lack of heavy equipment and mature high-temperature mold casting technology. Using isothermal forging to produce propeller hub central parts can reduce the tonnage of equipment, but large-scale mold casting technology cannot keep up. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J7/16B21J5/08B21J13/06
CPCB21J7/16B21J5/08B21J13/06
Inventor 叶俊青占立水李艳英夏春林欧阳斌
Owner GUIZHOU ANDA AVIATION FORGING
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