A Method for Measuring Residual Stress in Milling Based on Deflection Variation and Backward Method
A residual stress and milling technology, applied in the field of milling residual stress measurement, stress measurement, and gradual corrosion and peeling, which can solve the problems of difficulty in popularization, expensive X-ray stress meter, and inability to correctly predict the deformation of parts. Simple, inexpensive equipment
Inactive Publication Date: 2015-07-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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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 deformation of the part, and the price of the X-ray stress meter is quite expensive, and there are still certain difficulties in its popularization and use.
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[0025] The basic idea, the device used and the working process of the present invention will be introduced in detail below in conjunction with the accompanying drawings.
[0026] The main idea of this invention is to carry out such as image 3 Corrosion removes the material as shown, the stress layer is divided into several times for corrosion peeling, and the thickness of the material layer removed by each corrosion is measured with a vernier caliper, and as shown figure 2 As shown, the part is scanned with a laser displacement sensor on the machine tool to measure the change of part deflection after each corrosion, according to image 3 The change in the position of the neutral layer of the part shown results in the resulting stress layer as figure 1 The change in the bending moment shown, combined with the change in the measured deflection, pushes back forward to the value of the residual stress.
[0027] Set the length of the part to be L, the height to be h, and the ...
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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 reverse deduction method, in particular to a method for gradually corroding and exfoliating layers, simultaneously measuring the deflection change of workpieces and gradually inverting the residual stress of shallow layers from the residual stress of deep layers , which belongs to the stress measurement method in the field of mechanical engineering. Background technique [0002] The main characteristics of the surface stress of the workpiece caused by milling are that the distribution is very shallow (generally no more than 0.2mm) and the rate of change in the depth direction is very high. It is difficult to measure the stress value. The size and distribution of the surface machining residual stress caused by different milling parameters are not consistent. In order to predict the deformation of parts of different sizes and shapes caused ...
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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