Measuring device and method of magnetostriction coefficient

Abstract

The invention discloses a magnetostrictive coefficient measuring device, comprising an air-floating platform, a laser vibrometer, an excitation unit, a reflective sheet self-adhesive unit, a sliding unit and a sampling unit; the sliding unit includes a pair of guide rails and is slidably installed U-shaped guide rail on the guide rail; the sampling unit includes a mechanical gripper slidably mounted on the U-shaped guide rail, a front suction cup arranged on one end of the mechanical gripper, a rear suction cup arranged on the other end of the mechanical gripper, and a mechanical gripper arranged on the guide rail. The sample frame to be measured, the sample measurement frame and the sample recovery frame are between; the self-adhesive unit of the reflective sheet includes an electric turntable arranged next to the sample frame to be measured and an electromagnetic chuck installed on the mechanical gripper. The measuring device measures the magnetostrictive strain amount of the grain-oriented electrical steel sheet and the reproducibility of the noise level value can be controlled within 3%, and the measurement accuracy exceeds the control requirements of the laboratory; at the same time, the measuring device realizes the magnetostrictive coefficient of the electrical steel sheet. non-contact measurement with high efficiency.

Description

Technical field [0001] The present invention belongs to the technical field of silicon steel product detection, and more particularly to measuring devices and measurement methods of magnetostrictive coefficients. Background technique [0002] The magnetostrictive effect refers to the phenomenon that the ferromagnetic material is in an external magnetic field environment, the volume or size of the material changes corresponding to the magnetization intensity. In 1842, the physicist W. P.joule found the magnetostrictive phenomenon of iron materials, and then the magnetostrictive phenomenon of ferroalloys was also discovered, and these ferric alloy materials were studied. The study found that when these ferromagnetic materials are external to an external force or a deformation, the surrounding magnetic field can be changed, thereby causing changes in the surrounding magnetic field regularity, that is, the magnetostrictive reverse effect found by Physician Villari, general habit is V...

AI Technical Summary

Problems solved by technology

However, the one-dimensional magnetostriction coefficient measurement system developed by BROCKHAUS in Germany in 2010 does not adapt to the changes in the standard text.

[0004] In addition, further experiments found that the measurement reproducibility deviation of the magnetostrictive measuring instrument developed by Brockhaus is relatively large, generally more than 10%, and in extreme cases it can reach 50%. The measurement accuracy is poor and does not meet the accuracy requirements of the laboratory.

At the same time, the existing equipment that uses lasers to measure the magnetostriction coefficient requires manual operations such as bonding reflective sheets on the sample, taking and placing samples, etc., which is inefficient, and it is incompatible with the exponential growth demand and the current low-noise oriented electrical steel products. Increasingly accelerated product testing cycle requirements do not meet

[0005] At present, according to the requirements of the IEC technical report 68 / 602 / NP, the reproducibility of the existing oriented silicon steel (electrical steel) AC magnetostriction coefficient measurement devices is as high as 10%, and these devices need to be manually bonded to the sample. Manual operations such as sheeting, picking and placing samples, etc., are inefficient and inconsistent with the current exponential growth demand for low-noise grain-oriented electrical steel products and the increasingly accelerated product testing cycle requirements

In addition, due to manual pasting of the reflective sheet and adjustment of the laser focus, the small position and distance difference between the reflective sheet and the laser will amplify the random fluctuation of the received energy, and the internal influence factors of the measurement device are not circumvented, resulting in great fluctuations in the measurement results. Big

Images