Tool residual stress testing system based on magnetic acoustic emission principle and method

Abstract

The present invention discloses a tool residual stress testing system based on magnetic acoustic emission principle and a method. The system includes a pulse power supply, an excitation coil, a test sensor, a fixture and a processor. The pulse power supply is connected with the excitation coil and provides preset current for the excitation coil. The test sensor and the tool to be tested are placedinside the excitation coil; the test sensor is affixed to the upper surface of the tool to be tested by the fixture; the excitation coil provides an alternating magnetic field for the tool to be tested; and the test sensor is used to collect stress wave generated by the tool to be tested under the influence of the magnetic field. The processor is connected with the test sensor and is used for receiving and processing the stress wave and outputting the residual stress level of the tool to be tested. The detection method of the system is more convenient and low-cost; the overall residual stresslevel is evaluated; and the timeliness is greatly improved with good accuracy.

Description

technical field [0001] The invention relates to the technical field of residual stress detection, in particular to a tool residual stress testing system and method based on the principle of magnetoacoustic emission. Background technique [0002] With the rapid development of industry, the demand for high-quality cutting tools is increasing. The tool will produce different degrees of residual stress after processing and after use. The level of residual stress directly affects the quality of the tool and the length of its life. Most of the current cutting tools are based on high-speed steel and cemented carbide, and the surface is coated with a hardened coating. The hardness is very high, and the traditional lossy residual stress measurement method is difficult to work. [0003] Existing residual stress detection methods are divided into two categories, destructive testing and nondestructive testing. In terms of destructive testing, the "ring core method" and "blind hole met...

AI Technical Summary

Problems solved by technology

To deal with the testing of large quantities of small cutting tools, only sampling can be used for performance evaluation

At the same time, the tested tool will no longer be used. In terms of dynamic evaluation, destructive testing seems to be helpless

However, the commonly used non-destructive residual stress detection, such as X-ray diffractometer, is not conducive to industrial applications because of its cumbersome operation, small evaluation area, and high cost, and it cannot be used for large-scale testing.

[0005] The existing application of detecting residual stress by using the principle of magnetoacoustic emission is not common. In the research at home and abroad, many pairs of welding containers, train wheels, chariots, missiles and other large components have been tested for residual stress after heat treatment, but no Detection of Tool Residual Stress Using Magnetoacoustic Emission Method

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