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New method for eliminating aluminium alloy workpiece residual stress

A technology of residual stress and a new method, applied in the fields of metal processing, cryogenic treatment and heat treatment, can solve the problems of cold work hardening of molding deformation, poor stress relief effect, and extremely high operation requirements, so as to improve strength and toughness and eliminate residual stress. , The effect of stable chemical properties

Inactive Publication Date: 2014-03-12
葛鹏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, in view of the fact that there is already a large residual stress in the aluminum alloy die forging itself, excessive die deformation may cause cold work hardening, cracks and fractures; while the deformation is too small, the effect of stress relief will not be good, so precise control and operation are required. extremely demanding
On the other hand, the cost of mold making required by mold cold pressing is very high, and it is an uneconomical choice to use this method to eliminate residual stress
[0007] In short, the above three methods of eliminating residual stress of aluminum alloys commonly used in industry all have some shortcomings and application limitations.

Method used

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  • New method for eliminating aluminium alloy workpiece residual stress
  • New method for eliminating aluminium alloy workpiece residual stress
  • New method for eliminating aluminium alloy workpiece residual stress

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A 6082-T6 aluminum alloy plate of 120 mm×120 mm×4 mm was subjected to solid solution at 540°C for 1 hour, cooled to room temperature with water, and placed in a program-controlled cryogenic box (transfer time not exceeding 5s), at a temperature of 6°C / min. The speed is cooled from room temperature to -190°C and then kept for 4 hours; then the sample is taken out and placed in boiling water at 100°C for 20 minutes, and the transfer time does not exceed 5s; Speed ​​heating to 175°C, heat preservation for 7 hours, and turn off the power; after the furnace temperature and the test piece are cooled to room temperature, take out the test piece and repeat the three-step operation after solid solution treatment twice to obtain the 6082 plate of the present invention. The average hardness of the specimens treated by this method increased from the initial 120HV to 135HV (test force 0.98N, hold for 15s); the average tensile strength increased from the initial 363MPa to 419MPa...

Embodiment 2

[0031] Extruded 6061-T6 aluminum alloy extruded "T" profile of 100mm×100mm×2mm automobile body structural parts was subjected to solid solution at 530°C for 100min, cooled to room temperature with water, and placed in a program-controlled cryogenic box (the transfer time should not exceed 5s), cooling from room temperature to -175°C at a rate of 7°C / min and then holding for 12h; then take out the sample and put it in a 250°C salt bath furnace for 15min, the transfer time should not exceed 5s; take out the sample from the salt bath furnace Put it in an electric drying oven and heat it to 170°C at a rate of 5°C / min, then keep it warm for 8 hours, and then turn off the power; after the furnace temperature and the specimen cool down to room temperature, take out the specimen and repeat the three-step operation after solid solution treatment twice. Obtain the 6061 T profile of the present invention.

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Abstract

The invention provides a new method for eliminating aluminium alloy workpiece residual stress, mainly aims at defects existing in a conventional residual stress eliminating method that the cost is high, the operation is complex, the requirement is high, the workpiece mechanical property is reduced, the workpiece surface is damaged, and the use is limited, and achieves double effects of eliminating residual stress and refining crystal grains through the organic combination of subzero treatment, the uphill quenching technology and conventional heat treatment. The new method has the specific operating steps of solution treatment, subzero treatment, uphill quenching and aging treatment, and has the characteristics that the technology method is simple, the environment is protected, the operation cost is low, the effect is superior to that of the conventional residual stress eliminating method, the residual stress is eliminated, meanwhile, the workpiece comprehensive mechanical property can be improved, and industrialized scale production can be realized.

Description

technical field [0001] The invention relates to the fields of metal processing and cryogenic treatment and heat treatment, and in particular provides a new method for eliminating residual stress of aluminum alloy workpieces. Background technique [0002] Aluminum alloy is the most widely used non-ferrous metal structural material in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry. At the same time, aluminum alloys are widely used in engineering structures. However, aluminum alloy workpieces often produce uneven deformation and heat effects during the production process, which inevitably generates residual stress inside the workpiece. The existence of residual stress will bring many adverse consequences, causing abnormal phenomena such as deformation, warping, twisting or waves of the workpiece during subsequent machining, which seriously affects its application. At the same time, the residua...

Claims

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Application Information

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IPC IPC(8): C22F1/04
Inventor 葛鹏易上琪
Owner 葛鹏
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