Casting technology is one of the main methods to obtain blank mechanical products, is a very important process, the basis of the foundry machinery industry occupies an important position in national economy. The present situation of the casting technology in China is large output, an annual output of 12 million tons of casting about, ChangDian much, more than 20000, foundry technology professionals in more than 1.2 million people. The one big characteristic of China foundry industry is the rapid development of township enterprises since the reform and opening up, become an important force in China's foundry technology industry.
The current industrial developed countries in the world the development of casting technology of induction up to roughly four goals, (1) to protect the environment, to reduce and eliminate pollution; (2) to improve casting quality and reliability, the production of high quality almost final shape casting; (3) reduce the production cost; (4) shorter lead ?