Blind hole method residual stress automatic drilling testing device

Abstract

The invention discloses a blind hole method residual stress automatic drilling testing device. The device comprises a drilling system, a clamping system, a positioning system and an automatic testing system; the drilling system can be used for drilling any plane of a test sample piece; the clamping system is used for clamping in a pushing and pressing manner, so that the clamping stress can be reduced to the greatest extent, and the measurement error is reduced; the positioning system can automatically identify the position of a strain gauge and calculate the coordinates of a drilling position; and the automatic testing system performs automatic tool setting and automatic drilling according to the position of the strain gauge identified by an image, and after drilling is finished, software calculates the residual stress of different depths and surface layers of the sample piece according to a strain value after feeding each time and the actual drilling hole diameter measured by the image identification.

Description

technical field [0001] The patent of the present invention relates to an automatic drilling test device for blind hole method residual stress, which includes a drilling system, a clamping system, a positioning system and an automatic testing system. The device can realize automatic tool setting, automatic drilling and automatic correction of measurement errors function. Background technique [0002] Residual stress is the stress that exists when an object maintains internal balance when there is no external force. In mechanical manufacturing processes, such as casting, cutting, welding, heat treatment and assembly, different degrees of residual stress will appear. Residual stress will affect the processing deformation, fatigue life and structural strength of materials. With the development of material science, the requirements for residual stress of materials are getting higher and higher. At present, the test methods of residual stress are divided into two categories: non-...

AI Technical Summary

Problems solved by technology

At present, the detection principle of the blind hole method is relatively mature, and the residual stress at different depths within a certain depth range can be obtained through one drilling, but the development of detection equipment for the blind hole method is still relatively slow

The traditional blind hole method can only measure the average stress within a certain range, and the drilling positioning device needs to be fixed with a magnetic base, which is inconvenient to measure for non-ferrous and non-planar parts, and the stability is not high; laser speckle diffraction The residual stress test of the blind hole method can obtain the stress in different depth ranges, but the equipment cost is high, and the drilling direction is only horizontal, and the drilling height adjustment is inconvenient

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