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Method for homogenizing residual stress through vibration positioning

A residual stress and stress technology, applied in the field of residual stress vibration positioning and homogenization, can solve the problems of long experimental period for obtaining aging process parameters, uncontrollable aging effect, and blind operation implementation, so as to achieve positioning reduction and homogenization of residual stress, The effect of fast and effective processing and shortened cycle time

Inactive Publication Date: 2011-02-23
BEIHANG UNIV
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Problems solved by technology

[0008] In order to solve the above problems, the present invention provides a residual stress vibration positioning and homogenization method to solve the problems of blind operation and implementation, long experimental period for obtaining aging process parameters, high cost and uncontrollable aging effect in the existing vibration aging technology.

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  • Method for homogenizing residual stress through vibration positioning
  • Method for homogenizing residual stress through vibration positioning
  • Method for homogenizing residual stress through vibration positioning

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Embodiment Construction

[0043] like figure 1 1 shown in a is the first-order mode shape of the slender beam, and 2 is the second-order mode shape of the slender beam, such as figure 1 1' shown in b is the first-order modal stress distribution, and 2' is the second-order modal stress distribution. Different frequencies correspond to different mode shapes, and different mode shapes correspond to different dynamic stress fields. Focus on eliminating residual stress in different parts . The bending stress in the middle of the first-order vibration mode is the largest, and the focus is to eliminate the residual stress in the middle of the beam; the peak value of the bending stress in the second-order vibration mode moves to 1 / 4 of the beam, and the focus is to eliminate the residual stress in this part, and eliminate the residual stress in different parts by selecting different vibration modes. Residual Stress.

[0044] like figure 2As shown, it is the method of reducing and homogenizing residual stre...

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Abstract

The invention relates to a method for homogenizing residual stress through vibration positioning. The method comprises the following steps of: (1) simulating the machining process of aging workpieces to obtain the distribution of a residual stress field in the workpieces quantitatively; (2) determining the specific position of the residual stress which needs to be homogenized according to the step (1); (3) performing model analysis on the workpieces to optimize a vibration mode, so that a high stress area of modality corresponds to a high residual stress area of the workpieces; (4) determining a support point, an excitation point and excitation frequency according to the optimized vibration mode; (5) performing dynamic analysis on vibration aging to optimize excitation force; (6) performing fatigue analysis on the vibration aging to optimize the excitation force and excitation time; (7) vibrating the workpieces by using optimized vibration aging process parameters; (8) determining thenext high residual stress position which needs aging; and (9) repeating from the step (3) to the step (8) until the stress field is homogenized. The method has the advantages of low running cost, short period, energy conservation, environmental protection, stable aging effect and small fatigue damage.

Description

technical field [0001] The invention relates to a method for eliminating residual stress by means of vibration positioning, in particular to a method for homogenizing residual stress through vibration positioning, which belongs to the technical field of vibration aging in mechanical manufacturing. Background technique [0002] In the field of mechanical manufacturing, after metal workpieces are processed by casting, forging, rolling, cutting, etc., residual stress is usually generated inside the metal due to uneven plastic deformation. The existence of this residual stress will cause the size of the metal workpiece to change. Reduce the dimensional accuracy of the workpiece. Therefore, the process of eliminating residual stress in the metal workpiece must be added in the production process. Commonly used residual stress relief methods include natural aging, thermal aging and vibration aging. Among them, natural aging takes up a lot of space and has a long cycle, which is no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D10/00
CPCY02P10/20
Inventor 赵晓慈张以都吴琼马勇杰
Owner BEIHANG UNIV
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