In the manufacturing process of mechanical components, residual stresses are generated in the materials due to different manufacturing processes such as casting, cutting, welding, heat treatment, etc. The presence of residual stress can reduce the strength of the workpiece, causing process defects such as deformation and cracking during the manufacturing process; Another convenience is to change the size of the workpiece or reduce its fatigue strength and other mechanical properties during the natural release process after manufacturing, thereby affecting its safety during use. Therefore, understanding the state of residual stress is crucial for ensuring the safety and reliability of the workpiece.

The blind hole method for measuring residual stress is a theoretically sound, technically mature, and widely used measurement method. currentlyBlind hole method stress detectorWidely used in residual stress measurement of blind hole method in China, combined with residual stress drilling device, it can be used in flat, curved, corner welds, angular edges, etc., with simple operation, especially suitable for on-site measurement. The device has the characteristics of low cost and simple operation. This device is simple and portable, and can be used not only in laboratories but also in production and construction sites.

Blind hole method stress detector Basic steps for residual stress detection using blind hole method:

1. Select the measurement point for residual stress on the workpiece. Generally, the point with the highest residual stress value or the point with the highest stress on the workpiece is selected for use;

2. Polish the surface of the tested point to a roughness of Ra0.8;

3. Clean the polished surface with alcohol;

4. Paste the strain rosette (gauge) on the measured point with fast gel;

5. After rapid solidification of the gel, the strain gauge lead on the strain gauge is connected with the measuring line of the residual stress detector through the wiring terminal;

6. Adjust the blind hole method stress detector to zero;

7. Drill a blind hole with a diameter of 2mm and a depth of 2.5mm at the center of the strain gauge using a device;

8. After drilling for 15 minutes, use a detector to measure the stress released after drilling and automatically calculate the magnitude and direction of residual stress.