In bearing about $ 30 billion in sales around the world, world's top 8 cross-bearing 75-80. Germany two bearing the 90 per cent of the national total, Japan 5 per cent of the national total of 90, United States 1 per cent of the national total of 56. Zwz, 7 in China with annual sales of more than 1 billion yuan enterprises, 28.3 per cent of industry-wide sales, top 30 production concentration only 43.6 per cent.
Manufacturing processes and process equipment technology development of China bearing industry slow processing rate is low, grinding low automation levels, only more than 200 pieces of automatic production lines. Most enterprises, especially in State-owned enterprises as the main production is still the traditional equipment. Is essential for bearing life and reliability of advanced heat treatment technology and equipment, such as climate control heating, double protection detail, Bainite quenching and low coverage, many technical problems research failed to make a breakthrough. Bearing steel development of new steel grades, improvement of steel quality, lubrication, cooling, cleaning and abrasive technology research and development, is not yet adapted to bearing product standards and quality requirements. Resulting in process capability index is low, poor consistency, product processing and dispersion of size, product quality and effect on accuracy, performance, service life and reliability.