Изучение технологии магнитопорошковой дефектоскопии чугунных деталей: тот “огненные глаза и золотые глаза” которые защищают качество

In the field of mechanical manufacturing, чугунные детали are widely used in various mechanical equipment due to their good castability, shock absorption and wear resistance. Однако, cast iron parts may produce defects such as cracks, pores, шлаковые включения, и т. д., during the production process. These defects are like “мины” hidden in the dark, which may cause equipment failures at any time or even cause safety accidents. And magnetic particle flaw detection technology is the “огненные глаза и золотые глаза” that discover these defects.

The principle of magnetic particle flaw detection is actually not complicated. It is based on the magnetic properties of ferromagnetic materials. When the cast iron parts are magnetized, if there are defects on the surface or near the surface of the cast iron parts, the magnetic resistance at the defects will increase, the magnetic lines of force will be distorted, and some magnetic lines of force will leak out of the surface of the cast iron parts, forming a leakage magnetic field. В это время, sprinkle magnetic powder on the surface of the cast iron parts; the magnetic powder will be adsorbed by the leakage magnetic field, forming obvious magnetic marks at the defects, thereby intuitively presenting the defects.

The process of magnetic particle inspection generally includes pretreatment, magnetization, application of magnetic powder, observation and recording, and post-processing. In the pretreatment stage, the surface of the cast iron parts should be cleaned and rust-free to ensure that there are no interference factors, such as oil, rust, и т. д., on the surface, so as to prepare for subsequent flaw detection. Magnetization is a key link. The cast iron parts are usually magnetized by alternating current, direct current or permanent magnets to generate a magnetic field inside the cast iron parts. Впоследствии, magnetic powder is evenly sprinkled on the surface of the cast iron parts. The magnetic powder can be dry powder or suspended in a liquid to form a magnetic suspension. If there are defects in the cast iron parts, the magnetic powder will gather at the defects to form clear magnetic marks. By observing the shape, size and position of the magnetic marks, the operator can accurately judge the nature and severity of the defects. Окончательно, post-processing such as demagnetization and cleaning is carried out to avoid the residual magnetism from affecting the subsequent use of the cast iron parts.

Magnetic particle inspection technology has many advantages. It is relatively simple to operate, does not require complex equipment and expensive costs, and can quickly and effectively detect tiny defects on the surface and near the surface of cast iron parts. Более того, magnetic particle inspection can directly display defects, and even inexperienced operators can easily identify defects. Однако, this technology also has certain limitations. It can only detect ferromagnetic materials, but not non-ferromagnetic materials.

In the production and maintenance of cast iron parts such as rail car accessories and machine tool beds, magnetic particle inspection technology plays a vital role. By regularly performing magnetic particle inspection on cast iron parts, potential quality problems can be discovered and dealt with in a timely manner, equipment failures and production accidents caused by defects in cast iron parts can be avoided, and the stable operation of mechanical equipment can be ensured. Благодаря постоянному развитию науки и техники, magnetic particle inspection technology is also constantly innovating and improving, providing more reliable technical support for the quality inspection of cast iron parts and safeguarding the safe development of the machinery manufacturing industry.

Поставщик

Лоянская компания Fonyo Heavy Industries Co., ООО,Основанная в 1998 году, является производителем литых железнодорожных деталей. Наш завод занимает площадь 72 600 кв.м., с более чем 300 сотрудники, 32 техники, включая 5 старшие инженеры, 11 помощники инженера, и 16 Техники.Наша производственная мощность 30,000 тонн в год. В настоящее время, в основном мы производим литье, механическая обработка, и сборка для локомотива,вагон,высокоскоростные поезда, горное оборудование,энергия ветра,и т. д. Наша продукция экспортируется в Россию, Соединенные Штаты, Германия, Аргентина, Япония, Франция, ЮАР,Италия и другие страны.
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