Esplorazione della tecnologia di rilevamento dei difetti tramite particelle magnetiche delle parti in ghisa: IL “occhi di fuoco e occhi d'oro” che tutelano la qualità

In the field of mechanical manufacturing, parti in ghisa are widely used in various mechanical equipment due to their good castability, shock absorption and wear resistance. Tuttavia, cast iron parts may produce defects such as cracks, pori, inclusioni di scorie, ecc., durante il processo di produzione. These defects are like “miniere” 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 “occhi di fuoco e occhi d'oro” 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. In questo momento, 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, ecc., 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. Successivamente, 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. Finalmente, 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. Inoltre, magnetic particle inspection can directly display defects, and even inexperienced operators can easily identify defects. Tuttavia, 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. With the continuous advancement of science and technology, 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.

Fornitore

Luoyang Fonyo Heavy Industries Co., Ltd,fondata nel 1998, è un produttore di parti ferroviarie in fusione. La nostra fabbrica copre un'area di 72.600㎡, con più di 300 dipendenti, 32 tecnici, compreso 5 ingegneri senior, 11 ingegneri assistenti, E 16 tecnici. La nostra capacità produttiva è 30,000 tonnellate all'anno. Attualmente, produciamo principalmente fusione, lavorazione, e assemblaggio per locomotiva,vagone ferroviario,treni ad alta velocità, attrezzature minerarie,energia eolica,ecc. I nostri prodotti sono stati esportati in Russia, gli Stati Uniti, Germania, Argentina, Giappone, Francia, Sudafrica,Italia e altri paesi.
Contatto: Stella Liu
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