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Method for preventing hot working warpage and deformation of large titanium alloy isothermal precise thin web plate forge pieces

A titanium alloy and thin web technology is used in the field of preventing warpage deformation of large-scale isothermal precision thin web forgings of large titanium alloys during thermal processing, and can solve the problems of inappropriate small area correction and large elastic modulus of titanium alloys.

Inactive Publication Date: 2011-07-13
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

The vibration aging mentioned in the document "Research on Key Technologies of Safety Correction for Machining Deformation of Aviation Integral Structural Parts" (Master's Thesis of Shandong University, May 2009) is not suitable for titanium alloy structural parts, because titanium alloy has a large modulus of elasticity, so it is not suitable for small-area correction

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  • Method for preventing hot working warpage and deformation of large titanium alloy isothermal precise thin web plate forge pieces
  • Method for preventing hot working warpage and deformation of large titanium alloy isothermal precise thin web plate forge pieces
  • Method for preventing hot working warpage and deformation of large titanium alloy isothermal precise thin web plate forge pieces

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Embodiment Construction

[0021] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0022] The outer contour size obtained in this embodiment is about 1180mm×1090mm, the inner contour size is about φ900mm, the average rib height is 70mm, the average web thickness is 10mm, and the XX aircraft TA15 titanium alloy overall frame forging with a local solid height of 180mm.

[0023] Step 1: Take the titanium alloy isothermal precision thin-web forging out of the high-temperature forging die, hang it on the hanging column, place the part with large mass above the hanging column, and heat it at 960°C with 10 -2 -10 -5 the s -1 The strain rate is isothermal forging out of the mold and suspended in air to room temperature; if it is directly placed on the ground to cool, the amount of warping deformation of the forging and the distortion deformation when the forging is ejected from the mold will be superimposed as high as 15mm-25mm / 1000mm;

[0024] on th...

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Abstract

The invention relates to a method for preventing hot working warpage and deformation of large titanium alloy isothermal precise thin web plate forge pieces. The method is characterized by comprising the following steps of: taking isothermal precise forge pieces out of a high-temperature forging mould, and then hanging the forge pieces on a bracket for air cooling; and before heat treatment in a furnace, flatly placing forge pieces with warpage on base plates, and putting cushion blocks between the forge pieces and base plates and firmly padding, wherein if the bottom surfaces of the forge pieces are parallel and have equal height, the heights of the cushion blocks are consistent, and if the bottom surface of the forge pieces have height falls, the heights of the cushion blocks have identical falls. By adopting the method, heat in the processes of cooling after isothermal forging and cooling after heat treatment of large complicated titanium alloy plane structures with unequal cross section areas is uniformly dispersed, and the forge piece warpage parts are pressed flatly in the heat treatment process. The process provided by the invention has the advantages of simplicity, easiness in application and low cost.

Description

technical field [0001] The invention relates to a method for preventing warpage and deformation of a large-scale titanium alloy isothermal precision thin web forging, which belongs to the metal thermal processing technology. Background technique [0002] In the past ten years, with the development of isothermal near-net forming technology, more and more large-scale integral titanium alloy structural parts are produced by isothermal forging technology. Since most aircraft structural parts have complex shapes, high ribs and thin webs, During the forging process, the deformation and flow of the metal in various places are inconsistent, leaving part of the processing stress; in the cooling process, due to the different thickness of each section of the forging itself and the influence of the placement method, the heat dissipation coefficient of each place is also different, resulting in temperature difference stress. After the temperature difference stress and the residual proces...

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Application Information

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IPC IPC(8): C22F1/10
Inventor 姚泽坤郭鸿镇虢迎光何森虎赵张龙
Owner NORTHWESTERN POLYTECHNICAL UNIV
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