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Wind power ring gear pinion planetary gear gearbox important core component, the current use of carburizing quenching strengthen internal teeth, however, the ring gear carburizing distortion seriously affect the product quality and production schedules. Although carried out measures to prevent the deformation process optimization, tooling inner stereotypes such as hardening, it achieved certain results, but for large-scale internal teeth ring gear diameter 1500MM above the heat distortion still serious, stereotypes and post production tooling grinding the cost is still high, but also seriously affect the production cycle. Some manufacturers use the inner tooth induction hardening, nitriding treatment or the internal teeth tooth surface enhancement means, although the basic heat distortion can solve the problem, but there are also some of the corresponding shortcomings. The induction hardening requires special quenching machine, the higher one-time investment costs and poor process stability, greater impact of human factors, such as hardening tooth imitation truly respect is not very mature. Similarly, the ion nitriding treatment also requires special equipment, the reliability of large nitriding furnace equipment, there are some problems, and nitride diffusion layer is also shallow, controlling nitriding temperature, arcing parts, etc., which makes the process stability be assured. So, although a lot of work in recent years, however, have a high risk of wind power industry, especially in terms of the inner ring is an important component of core wind turbine gearbox is still difficult to obtain a generally recognized.