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Polycrystalline material plate frame finish machining method based on internal residual stress nondestructive measurement

A technology of internal residual stress and polycrystalline materials, which is applied in the field of precision workpiece processing, can solve problems such as out-of-tolerance deformation, and achieve the effects of reducing processing deformation, reducing trial and error costs, and reducing scrap rate

Pending Publication Date: 2022-03-15
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above technical problems, the purpose of the present invention is to provide a method for finishing polycrystalline material plate and frame parts based on the non-destructive measurement of internal residual stress, so as to solve the problem of out-of-tolerance deformation existing in the processing of polycrystalline material plate and frame parts

Method used

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  • Polycrystalline material plate frame finish machining method based on internal residual stress nondestructive measurement
  • Polycrystalline material plate frame finish machining method based on internal residual stress nondestructive measurement
  • Polycrystalline material plate frame finish machining method based on internal residual stress nondestructive measurement

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Embodiment 1

[0045] like figure 2 , image 3 As shown, the metal plate to be processed used in this embodiment is a 2024-T351 pre-stretched aluminum plate, and the dimensional tolerance required by the L-shaped plate frame is ±0.20mm. The finishing method according to the present invention is carried out as follows:

[0046] S1, data collection: The residual stress and its distribution in different parts of the pre-stretched aluminum sheet to be processed are non-destructively measured by the short-wavelength characteristic X-ray diffraction method (for the specific detection method, please refer to the reference "Short-wavelength X-ray diffraction non-destructive measurement of the internal residual stress of the aluminum sheet "Wait);

[0047] S2, identify the risk area: Based on the stress data collected in step S1, analyze the distribution characteristics of the residual stress inside the plate, and identify the high tensile stress area, the high pressure stress area and the area wit...

Embodiment 2

[0054] like Figure 4 , Figure 5 As shown, the metal plate to be processed used in this embodiment is a 7050-T7451 pre-stretched aluminum plate, and the qualified tolerance of the size required by the cylindrical plate and frame is ±0.10mm. The finishing method according to the present invention is carried out as follows:

[0055] S1, data collection: non-destructive detection of internal residual stress and its distribution in different parts of the metal sheet to be processed by ultrasonic method;

[0056] S2, identify the risk area: based on the stress data collected in step S1, analyze the distribution characteristics of the residual stress inside the plate, set and identify the high tensile stress area, high pressure stress area and stress gradient preset value where the residual stress is higher than the preset value of 70MPa The area higher than 35 MPa / mm is a risk area, and there are three risk areas in this embodiment, which are risk area A6, risk area B7 and risk a...

Embodiment 3

[0064] The metal plate to be processed used in this embodiment is the same as that in Embodiment 2, and it is also a 7050-T7451 pre-stretched aluminum plate. The product workpiece to be processed is also the same as that in Embodiment 2, and it is also a cylindrical plate and frame, but the required size tolerance is acceptable. Be ± 0.01mm, according to finishing method of the present invention also with embodiment 2, difference is:

[0065] (1) S1, data collection: non-destructive detection of internal residual stress and its distribution in different parts of the metal sheet to be processed by neutron diffraction method;

[0066](2) S7, re-determining the risk area: after reducing the preset value of the high tensile stress area and high pressure stress area to 25MPa, and the preset value of the high stress gradient area to 15MPa / mm, the re-determined risk area The processing envelope of each risk zone in its redesign covers an area that is too large, and the metal sheet to...

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Abstract

The invention provides a polycrystalline material plate frame piece finish machining method based on internal residual stress nondestructive measurement. The problem that deformation is out of tolerance in existing polycrystalline material plate frame piece machining is solved. The method mainly comprises the steps of carrying out nondestructive testing on residual stress and distribution of the residual stress of different parts in a to-be-processed metal plate, marking a residual stress risk area causing deformation out-of-tolerance, designing and processing an envelope surface, calculating the envelope surface with the minimum deformation amount, planning a processing path and cutting the plate in sequence, and measuring and evaluating whether the deformation is out-of-tolerance or not. And the cutting machining process is optimized. The method of testing, theoretical analysis and actual measurement of machining deformation is used for solving the problem, the cost of labor, financial resources, time and the like can be greatly reduced, and good economic benefits are achieved.

Description

technical field [0001] The invention relates to the field of precision workpiece processing, in particular to a method for finishing polycrystalline material plate and frame parts based on non-destructive measurement of internal residual stress. Background technique [0002] With the development of modern manufacturing industry, the performance requirements of workpieces involved in precision machining fields such as aviation and aerospace have been continuously improved, and higher requirements have been put forward for the structural design of workpieces. For example, in order to reduce the weight of the aircraft while ensuring excellent aerodynamic performance, the original structure of aluminum alloy plate frame + skin + bolt connection has been eliminated, and the new integral structure has been more widely used in aircraft equipment. In addition, integral structural parts such as integral wall panels, girders, and bulkheads are gradually being adopted, and the processi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q50/04G06Q10/06G06F30/17G06F30/20G06F119/14
CPCG06Q10/043G06Q50/04G06Q10/06395G06F30/17G06F30/20G06F2119/14Y02P90/30
Inventor 车路长郑林窦世涛陈新封先河朱凯方丁张津车移计鹏飞李剑飞
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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