Measuring device of tubular part inner wall processing stress and measuring method thereof

Abstract

The utility model provides a measuring device of a tubular part inner wall processing stress and a measuring method thereof, relating to the technical field of a measuring method of a tubular part inner wall processing stress. The device comprises a measured tubular part, and the outer peripheral surface of the measured tubular part is respectively provided with an axial strain piece and a tangential strain piece. The axial strain piece and the tangential strain piece are respectively connected with a strain gauge through conductive wires. The strain gauge is connected with a PC through a conductive wire. According to the device and the method, the measuring device has a simple structure, the measurement result is accurate, and the device is suitable for different tube diameters.

Description

technical field [0001] The invention relates to the technical field of a method for measuring the machining stress of the inner wall of a tubular part. Background technique [0002] Residual stress refers to the stress system that maintains self-phase equilibrium inside the object when it is not affected by external force or after the external force is unloaded. It belongs to a kind of local internal stress in the inherent stress domain, and its value is usually difficult to predict. [0003] In terms of the causes of residual stress, it can be divided into the following categories: (1) residual stress caused by machining; (2) residual stress caused by uneven temperature; (3) residual stress caused by component dimensional tolerances. [0004] The existence of residual stress seriously affects the fatigue strength, static strength and corrosion resistance of the workpiece, causing process defects such as deformation and cracking of the workpiece during manufacture, which in ...

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Problems solved by technology

At present, the commonly used measurement method is the corrosion exfoliation method plus the X-ray method, but because the X-ray stress meter is relatively expensive, it is still difficult to popularize; and this method requires the material of the tested part to have regular grains, Otherwise, the error of the measurement result will be large (for example, TC4 material does not meet such requirements, and the measurement result by X-ray method will have a large error); in addition, if the diameter of the tube is too small, the measuring head of the X-ray strain gauge cannot be inserted into the tube Measure the inner wall

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