INFLUENCE OF VARIOUS FACTORS ON THE RELIABILITY OF ESTIMATES OF MAGNETIC PARAMETERS
DOI:
https://doi.org/10.15587/1729-4061.2012.4551Keywords:
magnetic control, coercive force, iron-carbon alloy, nondestructive testing of the quality.Abstract
For most practical problems, the magnetic structure analysis cannot predict the quantitative relationship between the coercive force and the structural state of the material of goods on the basis of theoretical models only, due to a significant number of factors that affect the experimental estimate. Therefore, the aim of research is to determine the influence of the main factors for the products of different sizes, taking into account the structure, phase composition, geometry and surface conditions on the reliability of the estimates. Measurements of the coercive force in the production were carried out using the most common portable Coercimeters MRC-C with two types of superimposed transformers and 6 kinds of pole pieces, designed to assess the products of different size and shape. The developed method of research has helped to clarify the existing and establish new dependencies of influence of the shape and the ratio of the cross-section area of product and the pole pieces, the gap between the electromagnet and the product, the microgeometry of the contact, the structure of alloys, the reliability of the estimates of the magnetic parameter through the definition of transition coefficient when using pole pieces of various form. Comprehensive research found that the influence of the studied factors could reduce the accuracy of the measured indices of the magnetic characteristics up to 60%. The research results can be applied in the production while implementing the technology of nondestructive testing of the quality by magnetic method.References
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