Do aço bruto ao componente de precisão

Um rolamento de rolamento parece simples, mas sua produção é uma das mais processos disciplinados em engenharia mecânica. Um típico sulco profundo ou rolo rolamento passa por cerca de nove estágios controlados, e a confiabilidade do peça acabada depende de manter a precisão em nível de micrômetro em cada um deles.

1. Selecção e Formação de Materiais

O ponto de partida é a matéria-prima. Os anéis são na maioria das vezes feitos de aço com alto teor de carbono (amplamente especificado como GCr15 / 100Cr6 / AISI 52100 / SUJ2), com graus inoxidáveis ou cerâmicos escolhidos para alta temperatura. A barra de aço é cortada em espaços em branco eForjadasem anéis internos e externos ásperos. Forjar não é apenas moldar - é refinar o fluxo de grãos do metal, melhorando a resistência e a resistência ao impacto em comparação com maquinado a partir da barra.

2. Annealing and Turning

Forged rings are annealed (heated to roughly 650-700°C and slowly cooled) to soften the metal and relieve internal stress, which makes the following machining easier and more accurate. Turning on CNC lathes then cuts the outer diameter, bore, faces and the raceway groove to a near-final shape, leaving only a small allowance for grinding.

3. Heat Treatment

Heat treatment converts the soft machined ring into a hard, fatigue-resistant component. The ring is austenitised, quenched (rapidly cooled in oil or gas) to form martensite, then tempered at low temperature to trade a little hardness for toughness. Through-hardened rings typically reach 58-64 HRC. Some designs use case carburising to keep a tough core under a very hard surface.

4. Grinding and Superfinishing

This is where precision is born. Grinding brings diameters and raceway geometry to tolerances of a few micrometres, with raceway surface roughness commonly held around Ra ≤ 0.2 µm. Superfinishing (a stone or tape polishing pass) then refines the raceway to Ra ≤ 0.05 µm, producing a cross-hatched surface that holds lubricant, lowers friction and noise, and extends fatigue life.

5. Rolling Elements, Cages and Assembly

Balls are cold-headed from wire, heat treated, then ground and lapped to roundness within fractions of a micrometre (grades such as G10 down to G5). Rollers follow a similar path. Finally the inner ring, outer ring, rolling elements and cage (retainer) are assembled in a clean environment, lubricated, sealed where required, and inspected for dimensional accuracy, vibration (Z1-Z4) and noise before release.

How KMK Bearing Applies This

At KMK Bearing (SINO BEARINGS, KMK brand) these principles guide every order we manufacture in Chengdu, China. Our in-house process chain - forging, heat treatment, precision grinding, superfinishing and cleanroom assembly - is built to the standards described above, whether the part is a standard catalog bearing or a custom-engineered solution.

• 20+ years of precision bearing manufacturing
• Materials from chrome steel to 17-4PH stainless steel and full ceramic (ZrO2, Si3N4)
• In-house heat treatment and metrology to P4/P2 (ABEC 7/9) precision
• Custom designs and low-MOQ prototyping from drawings or samples

Discuss your application with kevin@sinoti.com or browse our bearing catalog.

SINO BEARINGS (KMK) - Perfect Quality -- Great Service -- Customized.

Source: SINO BEARINGS