A drilling device for measuring residual stress by blind hole method

Abstract

The invention provides a drilling device for measuring residual stress through a blind hole method. The drilling device comprises an I-shaped support. The support comprises an upper cross beam, a lower cross beam and a vertical rod. The upper cross beam and the lower cross beam are connected to the two ends of the vertical rod through reversing bolts. A supporting base is arranged at the lower end of the vertical rod. A guide sleeve is fixedly connected to one end of the lower cross beam. An alignment device or a driller is arranged in the guide sleeve. The driller comprises a drilling cylinder sleeve which is arranged on the guide sleeve. A drill bit is arranged at the bottom end of the drilling cylinder sleeve and penetrates through the guide sleeve. A continuous force application device is arranged between the top end of the drilling cylinder sleeve and the upper cross beam and comprises an electromagnetic pressure block arranged at the top end of the drilling cylinder sleeve and an electromagnetic counter-force block which is arranged at one end of the upper cross beam and matched with the electromagnetic pressure block. The drilling device is simple in structure, convenient to operate and capable of saving time and labor and achieving the effects of improving the drilling precision and increasing the drilling speed, and the problems that it is difficult to guarantee the precision during drilling, and force application is difficult are solved.

Description

technical field [0001] The invention relates to the technical field of drilling tools, in particular to a drilling device for measuring residual stress by a blind hole method. Background technique [0002] During mechanical processes such as welding, cutting, and installation, it is often easy to cause plastic deformation of the material and cause residual stress in the workpiece. During the service process of the workpiece, the residual stress and the working stress generated by the external load are superimposed on each other, which will cause stress redistribution and secondary deformation of the workpiece. The residual stress may not only reduce the stiffness and stability of the workpiece, but also seriously affect the fatigue life of the structure. And the ability to resist stress corrosion, thus affecting the normal performance of the workpiece. Therefore, the testing and impact assessment of residual stress is particularly important. [0003] Residual stress testin...

AI Technical Summary

Problems solved by technology

When the hardness of the material is high, as the drilling depth increases, the resistance to the rotation of the drill bit gradually increases, making drilling more difficult

Usually the counterweight is only suitable for drilling vertically downwards. It is often difficult to control the pressure when directly applying pressure to the drilling rig. The drilling speed is often too slow when the pressure is too small. Human error, labor and time consuming

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