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Method for lowering quenched residual stress of high-strength aluminum large-scale frame-type die forging

A residual stress and aluminum alloy technology, applied in forming tools, metal processing equipment, manufacturing tools, etc., can solve the problems of large size, long aging time, and pollution, and achieve low equipment capacity requirements, good elimination effect, and improved finished products rate effect

Active Publication Date: 2019-11-19
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, natural aging has problems such as long aging time and unobvious residual stress relief; thermal aging consumes a lot of energy and has pollution, which has a great impact on the dimensional stability of components
Regarding thermal aging, there are currently reports that adopt the method of pressure-holding aging treatment, put the die forgings into the mold and apply a certain pressure and place them in the aging furnace for aging treatment. This method is suitable for relatively small die forgings, large aviation frames The size and weight of the die-like forgings are huge, and they cannot be placed in the aging furnace together with the forgings for aging treatment; the vibration method is not obvious for the residual stress of large cross-section forgings; The strength and corrosion performance of aluminum alloy; cold compression method is a common method to eliminate the quenching residual stress of die forgings. It causes defects such as coarse grains; the cryogenic treatment method has a weak effect on reducing the residual stress of forgings; the pre-stretching method is mainly used to eliminate the residual stress of aluminum alloy rolled thick plates

Method used

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  • Method for lowering quenched residual stress of high-strength aluminum large-scale frame-type die forging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The 7050 high-strength aluminum alloy large-scale frame die forgings prepared by the same forging process were subjected to solution treatment, and the draft angle of the ribs was 3° and the height was 50mm. The cavity size of the cold drawing die is 1.015 to 1.025 times that of the high-strength aluminum alloy large frame die forging, and the side wall slope is 4°. The solid solution temperature is 475°C±5°C, enter the water vertically, and the end with the larger length enters the water first, the quenching water temperature is 60°C±5°C, and the quenching transfer time is less than 15s. The quenching is completed after the forging is kept in water for 20mins. After quenching, place the forging in the lower die for cold drawing, and adjust the position of the forging so that the burr at each position of the forging is consistent with the gap between the lower die. Start cold stretching, the initial speed of the upper die is 0.5mm / s, and the speed is 0.15mm / s after the...

Embodiment 2

[0022] The 7085 high-strength aluminum alloy large-scale frame die forging prepared by the same forging process was subjected to solution treatment, and the rib draft angle was 5° and the height was 80mm. The cavity size of the cold drawing die is 1.015 to 1.025 times that of the high-strength aluminum alloy large frame die forging, and the side wall slope is 6°. The solid solution temperature is 475°C±5°C, enter the water vertically, and the end with the larger length enters the water first, the quenching water temperature is 60°C±5°C, and the quenching transfer time is less than 15s. The quenching is completed after the forging is kept in water for 20mins. After quenching, place the forging in the lower die for cold drawing, and adjust the position of the forging so that the burr at each position of the forging is consistent with the gap between the lower die. Start cold stretching, the initial speed of the upper die is 0.5mm / s, and the speed is 0.20mm / s after the stroke ex...

Embodiment 3

[0026] The 7150 high-strength aluminum alloy large-scale frame die forging prepared by the same forging process was subjected to solution treatment, and the rib draft angle was 7° and the height was 120mm. The cavity size of the cold drawing die is 1.025 to 1.035 times that of the high-strength aluminum alloy large frame die forging, and the side wall slope is 11°. The solid solution temperature is 475°C±5°C, enter the water vertically, and the end with the larger length enters the water first, the quenching water temperature is 60°C±5°C, and the quenching transfer time is less than 15s. The quenching is completed after the forging is kept in water for 20mins. After quenching, place the forging in the lower die for cold drawing, and adjust the position of the forging so that the burr at each position of the forging is consistent with the gap between the lower die. Start cold stretching, the initial speed of the upper die is 0.4mm / s, and the speed is 0.25mm / s after the stroke ...

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Abstract

The invention relates to a simple method for lowering the quenched residual stress of a high-strength aluminum large-scale frame-type die forging, and belongs to the technical field of aluminum alloymaterial heat treatment. According to the method, in allusion to the structure characteristics of the high-strength aluminum large-scale frame-type die forging, on the basis of learning from a cold compression method and a pretensioning method, a cold tensioning die is designed, in the process of cold tensioning die cavity and forging attaching, the tensioning effect is generated on the whole forging by squeezing the side wall of a fillet of the high-strength aluminum large-scale frame-type die forging, the cold tensioning deformation is controlled through design of the cold tensioning die, aweb is subjected to pressure maintaining, and thus the quenched residual stress of the high-strength aluminum large-scale frame-type die forging is lowered. According to the method, the capacity requirements on equipment are low, and possibility is provided for researching aluminum alloy integral forgings with larger sizes. Under controlling of technology parameters of the method, the influence onthe forging organization structure and the mechanical property is small, the eliminating effect of the residual stress is good, deformation in the forging machining process can be effectively reduced, and the part yield is increased.

Description

technical field [0001] The invention relates to a simple method for reducing the quenching residual stress of a high-strength aluminum alloy large-scale frame-type die forging, and belongs to the technical field of heat treatment of aluminum alloy materials. Background technique [0002] With the continuous improvement of the load-carrying capacity requirements of modern large passenger aircraft, the requirements for weight reduction are also becoming more and more stringent. It is machined from a large integral die forging. The 7xxx series high-strength aluminum alloys are age-strengthened aluminum alloys, which require solution aging heat treatment to improve strength, toughness and other properties. Large-scale frame die forgings have high levels of residual stress due to the different water entry sequences and cooling rates at each position, and the design of closed-loop die forgings is not conducive to the release of residual stress. The existence of residual stress l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04B21D22/20B21D37/10
CPCB21D22/20B21D37/10C22F1/002C22F1/04
Inventor 王亮李惠曲汝继刚何维维陈军洲郝敏伊琳娜臧金鑫
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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