Magnetostriction coefficient measuring device and measuring method

Abstract

The invention discloses a magnetostriction coefficient measuring device comprising a gas floating platform, a laser vibration measurement instrument, an excitation unit, a reflective sheet self-adhering unit, a sliding unit and a sampling unit. The sliding unit includes one pair of guide rails and a U-shaped guide rail installed on the guide rails in a sliding manner. The sampling unit includes amechanical gripper installed at the U-shaped guide rail in a sliding manner, a front sucking disc arranged at one end of the mechanical gripper, a rear sucking disc arranged at the other end of the mechanical gripper, a sample to-be-tested frame, a sample measuring frame, and a sample recycling frame, wherein the sample to-be-tested frame, the sample measuring frame, and the sample recycling frameare arranged between the guide rails. The reflective sheet self-adhering unit includes an electric turntable disposed beside the sample to-be-tested frame and an electromagnetic chuck mounted on themechanical gripper. According to the magnetostriction coefficient measuring device, the reproducibility of measuring a magnetostrictive strain amount and a noise level value of an oriented electricalsteel sheet can be controlled to be less than 3%; and the measurement accuracy exceeds the control requirements of the laboratory. Besides, the non-contact measurement of the magnetostriction coefficient of the electrical steel sheet is realized and the efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of silicon steel product detection, and in particular relates to a measuring device and a measuring method for a magnetostriction coefficient. Background technique [0002] The magnetostrictive effect refers to the phenomenon that the volume or size of ferromagnetic materials changes with the increase of magnetization under the environment of external magnetic field. In 1842, physicist W. P. Joule discovered the magnetostriction of iron materials, and then the magnetostriction of iron alloys was also discovered one after another, and these iron alloy materials were studied. The study found that when these ferromagnetic materials are subjected to external force or deformation, they can change the surrounding magnetic field, thereby causing regular changes in the surrounding magnetic field, which is the magnetostrictive inverse effect discovered by physicist Villari, which is generally called Vera Harley effe...

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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

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