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Article · Дефектоскопия · November 1, 2021

Разработка метода ультразвукового контроля качества пластиковых изделий, полученных методом ротационного формования

Р.С. Гайсин, Vitaliy Tyukanko, Alexandr Demyanenko

Alexandr Demyanenko
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Abstract

At present, the technology of rotational molding of plastics is rapidly developing in the world. However, with this method of processing, it is possible for "microbubbles" to appear in the walls of the products, which significantly impair their quality. In this work, to assess the quality of plastic products, the method of ultrasonic testing (UT) was applied. Using the echo method at an operating frequency of 2.5 MHz, samples of various degrees of quality were analyzed. It was found that the propagation speed of the ultrasonic signal does not depend on the degree of product quality and is 2330 ± 10 m / s. It was found that the larger the parameter of the surface roughness Rz of the products (from 2.5 to 20 μm), the smaller the amplitude of the background signal Аа becomes. An unfinished sample is determined by the Aa parameters (from -6.0 to -15.0 MHz). A reference sample (ρ = 0.942 g / cm3) has been determined with which it is possible to calibrate the flaw detector, its Aa = 0 dB at an operating frequency of 2.5 MHz. Revealed the relationship between the density / baking of products and the amplitude of the bottom signal. The possibility of detecting internal defects of products by the ultrasonic inspection method has been proved. A new method is proposed for identifying suitable products in production, with the help of which it is possible to determine the degree of product quality.

Ultrasonics and Acoustic Wave PropagationNon-Destructive Testing TechniquesStructural Engineering and Materials Analysisultrasonic testingrotational moldingplastic products

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