There are mechanical elements on the rim of gear forgings that can continuously mesh and transmit motion and power. The application of gear forgings in transmission appeared very early. At the end of the 19th century, the principle of the generating gear cutting method and the special machine tools and tools that used this principle to cut teeth appeared one after another. With the development of production, the stability of gear operation was paid attention to. Mainly used in mining machinery, petrochemical, automobile manufacturing and other fields. The main materials are 20CrMnTi 40Cr 42CrMo, etc.Gear forging products are mainly used in mining machinery, petrochemical, automobile manufacturing and other industries, of which more than 90% are automobile forgings, of which cold and warm precision forgings account for about 5.2% of the total forgings. In 2004, the total output of forgings in the country was about 3.26 million tons, of which about 2.44 million tons of die forgings, about 65% of die forgings, about 1.6 million tons of automobile forgings, and about 4-5% of the total amount of auto forgings. . The forgings forged by the free forging method on the forging hydraulic press larger than 10MN are called large forgings, and the large forgings production industry has reached a certain production scale and level.