A method for preparing high-strength and high-toughness aluminum alloy die forgings for aircraft wings
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A high-strength, high-toughness, aluminum alloy mold technology, applied in the direction of metal processing equipment, can solve the problems that affect the safety of aircraft, increase the probability of die forging fracture, low-magnification tissue flow-through, etc., achieve high bearing capacity, qualified electrical conductivity, high performance effect
Active Publication Date: 2020-06-23
NORTHEAST LIGHT ALLOY CO LTD +1
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Problems solved by technology
[0003] The present invention aims to solve the technical problem of serious eddy current and through-flow defects in the low-magnification structure of the existing die forgings, which greatly increases the probability of die forgings breaking during high-speed operation and seriously affects the safety of the aircraft, and provides an aircraft wing Preparation method of high-strength and high-toughness aluminum alloy die forging
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specific Embodiment approach 1
[0020] Specific embodiment one: the preparation method of a kind of aircraft wing high-strength high-toughness aluminum alloy die forging of this embodiment is carried out according to the following steps:
[0021] 1. Casting 2D70 aluminum alloy ingot;
[0022] 2. Clean the thimble hole of the ingot prepared in step 1, and then heat and extrude to obtain an aluminum alloy bar blank;
[0023] 3. On the free forging hydraulic press, use a bending machine to bend the aluminum alloy bar blank prepared in step 2, and then perform heating forging to obtain the L aluminum alloy blank;
[0024] Four, on the 10,000-ton hydraulic press, use a large flat anvil to flatten the L aluminum alloy blank prepared in step 3;
[0025] 5. Put the flattened L aluminum alloy blank processed in step 4 into a mold for heating and pre-pressing to obtain a pre-pressed forging;
[0026] 6. Etching and washing the pre-pressed forging prepared in step 5;
[0027] 7. Invert the upper and lower molds of t...
specific Embodiment approach 2
[0031] Embodiment 2: This embodiment differs from Embodiment 1 in that: in Step 1, the diameter of the 2D70 aluminum alloy ingot is 420 mm, and the hydrogen content is less than 1.2 mL / g. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0032] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that: when heating and extruding in step two, the ingot is kept warm for 5 hours after reaching temperature, and the temperature of the pressing cylinder is controlled at 420°C to 450°C, and the extrusion speed is 1.5 m / s, the size of the aluminum alloy bar blank is Φ110mm~Φ120mm, and the length is 1700mm. Others are the same as in the first or second embodiment.
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Abstract
The invention discloses a method for preparing a high-strength and high-toughness aluminum alloy die forging for an aircraft wing, and relates to the field of preparation of an aluminum alloy die forging. The method solves the technical problems that macrostructures of an existing die forging have serious eddy and through-flow defects, the probability of breakage of the die forging in the high-speed operation process is greatly increased, and the aircraft safety is seriously affected. The method has the following steps that 1. an aluminum alloy ingot is prepared; 2, heating and extruding are carried out on the ingot; 3, heating and bending are carried out; 4, flattening is carried out; 5, pre-press forming is carried out; 6, acid-base washing treatment is carried out; 7, die forging forming is carried out; 8, erosive washing repairing is carried out; 9, die forging heat treatment and performance testing are carried out; and 10, ultrasonic testing is carried out, and the die forging isobtained. The macrostructures of the die forging obtained through the method do not have no through-flow and coarse-grain defects, the probability of breakage of the die forging in the high air is greatly reduced, and the die forging has the comprehensive properties of high strength, heat resistance, good toughness and the like. The method is used for preparing the high-strength and high-toughnessaluminum alloy die forging for the aircraft wing.
Description
technical field [0001] The invention relates to the field of preparation of aluminum alloy die forgings. Background technique [0002] The development of high-tech fields such as aviation and aerospace requires aluminum alloys to have higher comprehensive properties such as strength, toughness, corrosion resistance, and fatigue resistance. The aero-engine is the heart of the aircraft, and its importance is self-evident. The die forging is made of 2D70 aluminum alloy. The die forging is a new material die forging specially developed for a certain type of aero-engine. Die forgings must be high temperature resistant and have good overall performance. Due to the lack of good process operation in the production process of die forgings, serious eddy currents and through-flow defects appear in the low-fold structure of die forgings, which greatly increases the probability of fracture of die forgings during high-speed operation, seriously affecting aircraft safety. Contents of th...
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Application Information
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