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Method for detecting residual stress of workpiece

A residual stress and detection method technology, which is applied in the field of workpiece processing, can solve problems such as unqualified bonding of strain gauges and large fluctuations in detection results, and achieve the effects of avoiding too thick an adhesive layer, improving measurement accuracy, and reducing interference

Active Publication Date: 2019-04-09
DONGFENG COMML VEHICLE CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of inappropriate workpiece surface treatment and unqualified strain gauge sticking in the existing detection methods, which cause large fluctuations in detection results, provide a detection method for workpiece residual stress, and describe the processing method of workpiece surface in detail. The pasting method of the strain gauge and the connection requirements of the wires take into account the environmental factors to reduce the error

Method used

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  • Method for detecting residual stress of workpiece
  • Method for detecting residual stress of workpiece
  • Method for detecting residual stress of workpiece

Examples

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Embodiment 1

[0043] To detect the residual stress of a heavy-duty diesel engine cylinder head casting blank, the steps are as follows:

[0044] Step 1: Combining the CAE stress simulation analysis results of the cylinder head and the area with high stress when the cylinder head is in use, determine the location to be inspected, inspection point A, inspection point B, and inspection point C;

[0045] Step 2: Grinding the surface of the castings at detection point A, detection point B, and detection point C, first use mechanical grinding for pre-grinding, pay attention to the surface temperature during the pre-grinding process, and cool down when the temperature rises, and pre-grind until the surface is oxidized After the skin is completely polished off, gradually use 80#, 120#, 240# sandpaper to fine-grind the surface of the detection position, and grind back and forth along the same direction as much as possible to ensure that the surface of the detection position is smooth and clean, witho...

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Abstract

A method for detecting the residual stress of a workpiece is provided. The method comprises 10 steps: confirming a detection portion and formulating a coordinate system, grinding the surface of the detection portion, cleaning the surface of the detection portion, sticking and inspecting the strain gauge, performing strain gauge protection, performing strain gauge connection inspection, measuring and zeroing the initial value of the strain gauge, selecting a calibration sample, cutting the workpiece and reading the strain value, and calculating the strain force. According to the method providedby the present invention, the method for processing the surface of the workpiece, the method for sticking the strain gauge, and the connection requirements for the wire are described in a detailed manner, the environmental factor is considered and the error is reduced.

Description

technical field [0001] The invention relates to the field of workpiece processing, in particular to a detection method for workpiece residual stress. Background technique [0002] During the solidification and cooling process of the workpiece, stress will inevitably be generated due to factors such as the difference in cooling rate of each part, the resistance of shrinkage, and the volume change caused by tissue transformation. If the internal stress of the workpiece is not released, it will remain in the workpiece in the form of residual stress. The greater the residual stress in the workpiece, the deformation will occur during the placement, operation, processing and use of the part, the dimensional accuracy will be reduced, and cracking will occur in severe cases. [0003] Chinese patent authorization announcement number: CN 104006905 B, patent authorization announcement date: December 07, 2016, patent name: "A strain detection method for cylinder castings", the inventio...

Claims

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Application Information

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IPC IPC(8): G01L1/22
CPCG01L1/22G01L1/2275
Inventor 张士斌涂欣达金通张健谢文琪张路勃洪语哲
Owner DONGFENG COMML VEHICLE CO LTD
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