Milling residual stress measuring method based on deflection changes and inverse method

A residual stress and milling technology, which is applied in the fields of gradual corrosion and peeling, stress measurement, and milling residual stress measurement. Simple, inexpensive equipment

Inactive Publication Date: 2014-01-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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Problems solved by technology

In the past, the stress value obtained by combining the X-ray method with corrosion and exfoliation cannot correctly predict the deformatio...

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  • Milling residual stress measuring method based on deflection changes and inverse method
  • Milling residual stress measuring method based on deflection changes and inverse method
  • Milling residual stress measuring method based on deflection changes and inverse method

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Embodiment Construction

[0025] In the following, the basic idea, device and working process of the present invention will be introduced in detail with reference to the accompanying drawings.

[0026] The main idea of ​​this invention is to carry out such as image 3 As shown in the corrosion removal material, the stress layer is divided into multiple corrosion stripping layers, and the thickness of the material layer removed by each corrosion is measured with a vernier caliper, and figure 2 As shown, the laser displacement sensor is used to scan the parts on the machine tool to measure the changes in the deflection of the parts after each corrosion. image 3 The change in the position of the neutral layer of the part shown results in the stress layer produced as figure 1 The change in the bending moment shown, combined with the change in the measured deflection, reverses the residual stress value.

[0027] Set the length of the part as L and the height as h, and the position of the neutral layer of the pa...

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Abstract

The invention discloses a milling residual stress measuring method based on deflection changes and an inverse method. Corrosion delamination is carried out on a stress layer for multiple times, the thickness of a material layer removed through corrosion each time is measured by a vernier caliper, a part is scanned on a machine tool by using a laser displacement sensor to measure the change of the deflection of the part after the corrosion of each time, the change of the bending moment generated by the stress layer is obtained according to the change of the position of the neutral layer in the part, the residual stress value is calculated forwards in an inverse mode by combining the changes of measured deflection, and lastly the stress values of all the stress layers before the self-balance of the stress are obtained. The milling residual stress measuring method based on the deflection changes and the inverse method is simple in operation and reliable in result, and the used equipment is low in price.

Description

Technical field [0001] The invention discloses a method for measuring residual stress in milling processing based on deflection change and inverse deduction method, in particular to a method for gradually corroding and delaminating, simultaneously measuring the deflection change of a workpiece and gradually deducing shallow residual stress from deep residual stress , It belongs to the stress measurement method in the field of mechanical engineering. Background technique [0002] The main feature of the surface stress of the workpiece caused by milling is that the distribution is very shallow (generally no more than 0.2mm) and the rate of change in the depth direction is very high, and the measurement of its stress value has certain difficulties. The size and distribution of surface machining residual stress caused by different milling parameters are not consistent. To predict the deformation of parts of different sizes and shapes caused by machining residual stress, the interfere...

Claims

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Application Information

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IPC IPC(8): G01L1/00
Inventor 杨吟飞李亮孟龙晖何宁赵威
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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